Unit Coolers: Installation and Operations Manual

Installation and
Operations Manual
H-IM-UC May 2023 Part No. 25008201

Replaces August 2022
Unit Coolers
Scan QR codes in this manual, or

scan Unit Cooler Cabinet for links
to additional important information
Table of Contents
General Safety Information...............................................................................2 Operational Check Out........................................................................................5
Inspection................................................................................................................2 Evaporator Superheat..........................................................................................6
Warranty Statement.............................................................................................2 Refrigerant Glide...................................................................................................6
DOE Walk-In Cooler Freezer AWEF Set Points.............................................2 2 Speed Motor Field Wiring...............................................................................6
Placement ...............................................................................................................2 Expansion Valve Selection.............................................................................7-8
Minimum Unit Clearances..................................................................................3 Hot Gas Defrost Systems....................................................................................9
Unit Cooler Mounting..........................................................................................4 Evaporator Troubleshooting.......................................................................... 10
Defrost Troubleshooting.....................................................................................4 InterLink™ Replacement Parts....................................................................... 10
Field Wiring..............................................................................................................4 CO2 Unit Coolers................................................................................................. 12
Condensate Drain Lines......................................................................................5 Electronic Thermostats...............................................................................13-15
Check Out and Start Up......................................................................................5 Discontinued Unit Coolers.............................................................................. 16
H-IM-UC-0523 | Version 002
Installation
Installation and
and Operations
Operations Manual
Manual
General Safety Information
1. Installation and maintenance to be performed only by qualified 4. Avoid contact with sharp edges and coil surfaces.
personnel who are familiar with this type of equipment. They are a potential injury hazard.
2. Units are pressurized with dry air or inert gas. All units must 5. Make sure all power sources are disconnected before any
be evacuated before charging the system with refrigerant. service work is done on units.
3. Make sure that all field wiring conforms to the requirements
of the equipment and all applicable national and local codes.
WARNING: Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal injury or death.
Inspection
(b) Inert gas must be charged into the piping during brazing.
Responsibility should be assigned to a dependable individual at the job site to receive
material. Each shipment should be carefully checked against the bill of lading. The (c) The power supply to the unit must meet the following
shipping receipt should not be signed until all items listed on the bill of lading have conditions:
been accounted. Check carefully for concealed damage. Any shortage or damages A. Three phase voltages must be +/- 10%
should be reported to the delivering carrier. Damaged material becomes the delivering of nameplate ratings. Single phase must be
carrier’s responsibility, and should not be returned to the manufacturer unless prior within +10% or -5% of nameplate ratings.
approval is given to do so. When uncrating, care should be taken to prevent damage.
Heavy equipment should be left on its shipping base until it has been moved to the final B. Phase imbalance cannot exceed 2%.
location. Check the serial tag information with invoice. Report any discrepancies to your (d) All control and safety switch circuits must be properly connected
Heatcraft Refrigeration Products Sales Representative. according to the wiring diagram.
Units are pressurized with dry air or inert gas. The absence of pressure does not verify a (e) The factory installed wiring and piping must not be changed
leak. Check the coil for leaks before installing or returning it to your wholesaler. without written factory approval.
Warranty Statement (f ) All equipment is installed in accordance with

Heatcraft Refrigeration Products specified minimum clearances.
Seller warrants to its direct purchasers that products, including Service Parts,
manufactured by SELLER shall be of a merchantable quality, free of defects in material Recommended Unit Cooler Placement
or workmanship, under normal use and service for a period of one (1) year from date
of original installation, or eighteen (18) months from date of shipment by SELLER, Some general rules for evaporator placement which must be
whichever first occurs. Any product covered by this order found to Seller’s satisfaction to followed are:
be defective upon examination at Seller’s factory will at SELLER’s option, be repaired or 1. The air pattern must cover the entire room.
replaced and returned to Buyer via lowest common carrier, or SELLER may at its option 2. NEVER locate evaporators over doors.
grant Buyer a credit for the purchase price of the defective article. Upon return of a
3. Location of aisles, racks, etc. must be known.
defective product to SELLER’s plant, freight prepaid, by Buyer, correction of such defect
by repair or replacement, and return freight via lowest common carrier, shall constitute 4. Location relative to compressors for minimum pipe runs.
full performance by SELLER of its obligations hereunder. 5. Location of condensate drains for minimum run.
SELLER shall have no liability for expenses incurred for repairs made by Buyer except The size and shape of the storage will generally determine the type and
by prior, written authorization. Every claim on account of breach of warranty shall be number of evaporators to be used and their location. The following are
made to SELLER in writing within the warranty period specified above – otherwise such some typical examples:
claim shall be deemed waived. Seller shall have no warranty obligation whatsoever if
its products have been subjected to alteration, misuse, negligence, free chemicals NOTE: Leave space equal to unit height between bottom of unit
in system, corrosive atmosphere, accident, or if operation is contrary to SELLER’s or and product. Do not stack product in front of fans.
manufacturer’s recommendations, or if the serial number has been altered, defaced, or
removed.
DOE Walk-In Cooler Freezer AWEF Set Points
Seller makes no express warranties except as noted above. All implied warranties are
limited to the duration of the Express Warranty. Liability for incidental and consequential Based on information currently available, following set points must be
damages is excluded. adhered to for DOE AWEF test conditions:
The forgoing is in lieu of all other warranties, express or implied, notwithstanding the Condensing Unit Minimum Head Pressure
Head pressure
provisions of the uniform commercial code, the Magnuson-Moss Warranty - Federal LT - 100 psi
Trade Commission Improvement Act, or any other statutory or common law, federal or MT - 150 psi
state.
Evaporator Superheat
SELLER makes no warranty, express or implied, of fitness for any particular purpose, or of 6.5°F
any nature whatsoever, with respect to products manufactures or sold by seller hereunder, Defrost Termination
except as specifically set forth above and on the face hereof. It is expressly understood LOP - 55°F MP - 55°F
and agreed that SELLER shall not be liable to buyer, or any customer of buyer, for direct CM -- 85°F
CM 85°F LUC - 55°F
or indirect, special, incidental, consequential or penal damages, or for any expenses LVCM -- 80°F
50°F
incurred by reason of the use or misuse by buyer or third parties of said products. To the LVCM
extent said products may be considered "consumer products," As defined in Sec. 101 Unloader Pressure
MP - 55°FControl
of the Magnuson-Moss Warranty - Federal Trade Commission Improvement Act, SELLER MT
LUC- -Below
55°F 23°F SST LT - Below -22°F SST
makes no warranty of any kind, express or implied, to "consumers," except as specifically
Disclaimer: This communication is provided for informational purposes only
set forth above and on the face hereof.
and is based on information that is subject to change and interpretation.
The following conditions should be adhered to when installing this Heatcraft recommends customers review the applicable laws and regulations
unit to maintain the manufacturers warranty: to ensure compliance with regulations. For DOE regulations, see US DOE
(a) System piping must be in accordance with good refrigeration Energy Efficiency and Renewable Energy website for Walk-In Coolers and
practices. Freezers at https://www.regulations.doe.gov/ccms
© 2019 Heatcraft Refrigeration Products LLC

2
2
© 2023 Heatcraft Refrigeration Products LLC
SpaceUnit
Unit Coolers
Coolers
and Location Requirements for
Unit
Air Coolers
Cooled Condensing Units and Remote Condensers
Unit Coolers
Minimum Unit Clearances
Minimum
UnitUnit
Minimum UnitClearances
Coolers
Clearances
FigureUnit
Figure Coolers
1.1.Medium
Medium
Medium
Profile
Profileand
andLarge
LargeUnit
UnitCoolers
Coolers
Profile and Large Unit Coolers
Figure 1. Medium Profile and Large Unit Coolers
NOTE:
NOTE:
W = Total width
Minimum Unit Clearances W = Total width
of evaporator
of evaporator
Figure 1. Medium Profile and Large UnitNOTE:
coil surface.
Coolers
coil surface.
W = Total width
Figure 1. Medium Profile and Large Unit Coolers
of evaporator
One
Oneevaporator
evaporator coil surface.
NOTE: Two evaporators
Two evaporators
W = Total width
NOTE:
Figure
Figure2.2.Low
LowProfile Unit Coolers
One Profile Unit Coolers
evaporator Wof=evaporator
Total width
Two evaporators
ofcoil surface.
evaporator
Figure 2. Low Profile Unit Coolers NOTE:
coil surface.
Figure 2. Low Profile Unit Coolers NOTE:
H = Total height
One evaporator H = Total height
of evaporator Two evaporators
One evaporator of evaporator
11/3 H NOTE:
coil surface. 1/3 Hevaporators11/3 H
1Two
Figure 2. Low Profile Unit Coolers coil surface.
H = Total height
11/3 H
11/3 H
Figure 2. Low Profile Unit Coolers of evaporator 11/3 H 11/3 H

coil surface. Two evaporators
One
Oneevaporator NOTE: Two evaporators
evaporator
H = Total height
NOTE:
Figure Hof = evaporator
Total height Two evaporators
Figure3.3.Center Mount Unit Coolers
One evaporator
Center Mount Unit Coolers coil surface.
of evaporator
coil surface.
Figure 3. Center Mount Unit Coolers Two evaporators
One evaporator
Two evaporators
One evaporator
Figure 3. Center Mount Unit Coolers
Recommended Maximum - Minimum Dimensions for
Recommended
Center MountMaximum - Minimum
Unit Cooler Dimensions for
Installations.
E Center Mount S Unit CoolerMInstallations.T
Max. E Min. Max. S Min. Max. M Min. Max. T Min.
Max.
25' Min.
Recommended
2' Max.
20'Maximum
Min.
3' - Minimum
Max. Min.
40' 3' Dimensions
Max. Min.
40' for
6'
25' 2' 20'
Center Mount Unit
3' Cooler40' Installations.
3' 40' 6'
E S M T
Max. Min. Max. Min. Max. Min. Max. Min.
Figure
Figure3A.
3A. Slim
SlimContour Unit Coolers
Contour Unit Coolers
25'Recommended
2' 20'Maximum 3' - Minimum
40' 3'Dimensions
40' 6'
for
Center Mount Unit Cooler Installations.
Recommended Maximum - Minimum M Dimensions
A E
NS2NS
Center Mount
S
Unit Cooler Installations.
A T for NS2NS
A
NS2NS
A
Figure 3A. Slim Contour Unit Coolers
NS2NS
Max. Min. Min

Max. Min. Max. AM Min. Max. A Min. NS2NS
ANS2NS
A
AA A E Min
S T B NS2NS NS NS2NS
NS2NS
25'
A Max. Min. 2' 20' 3' A
40' 3'
NS2NS
40' 6'B NS2NS NS

A
NS2NS
A 18" Min. Max. Min. Max. Min.

Max.
NS2NS NS2NS
A 25' A
2' 20'18" 3'
NS2NS 40' 3' 40' A 6' NS2NS
A
NS2NS
B 36"
Min
&.7+14<
&.7+14<
A B A
&.7+14<
Figure 3A. Slim Contour UnitACoolers B 36"

NS2NS NS NS2NS
A
&.7+14<
&.7+14<
&.7+14<
NS2NS NS2NS
Figure 3A. Slim Contour Unit Coolers A 51&3;.*< 18" 51&3;.*<
A A
51&3;.*<
A B 36"
NS2NS NS2NS 51&3;.*<
NS2NS
&.7+14<
&.7+14<
Min
&.7+14<
A NS2NS
A B NS
A A NS2NS
A A A
NS2NS NS2NS
NS2NS NS2NS
NS2NS
51&3;.*<
A Min
18" A
NS2NS
B
NS
A
51&3;.*<
NS2NS
A
NS2NS
A
NS2NS
AB 18"
36"
&.7+14<
&.7+14<
&.7+14<
B 36"
&.7+14<
&.7+14<
&.7+14<
51&3;.*< 51&3;.*<
51&3;.*< 51&3;.*<
33
3
Installation and Operations Manual
Installation and Operations Manual
Unit Cooler Mounting
Unit Cooler Mounting cleaning without the use of tools. When lagging or bolting the unit flush
Most evaporators can be mounted with rod hangers, lag screws, or bolts. Use
Most
5/16"evaporators can be
bolt and washers ormounted
rod for upwith rod
to 250 hangers,
pounds, lag
3/8" forscrews, or bolts.
up to 600 poundsUse cleaning without
to the ceiling, sealthe
theuse
jointofbetween
tools. When lagging
the top and theor bolting the unit
ceiling with flush
an NSF
5/16" bolt and washers or rod for up to 250 pounds, 3/8" for up to 600
and 5/8" for over 600 pounds. Care should be taken to mount the units level sopounds to thesealant
listed ceiling,and
sealends
the of
joint
open between the top and
hanger channels mustthebe ceiling with
sealed to an NSF
prevent
and 5/8" for over 600 pounds. Care should be taken to mount the units level so listed sealant and
accumulation ends of
of foreign open hanger channels must be sealed to prevent
matter.
that condensate drains properly. Note that some unit cooler designs achieve
that condensate drains properly. Note that some unit cooler designs achieve accumulation of foreign matter.
drainpan
drain panslope
slopeby
by using
using different
differentheight
heightmounting
mountingbrackets.
brackets.InInthis situation,
this situation,
thetop
topof
ofthe
the mounting
mounting brackets When locating
When locating unit
unit coolers
coolers in
in aa cooler
cooler or
or freezer,
freezer, refer
refer to
toFigures
Figures11through
through 4
the bracketsshould
shouldbebelevel.
level.Adequate
Adequatesupport
supportmust
mustbebe
4 for guidelines.
providedto
provided tohold
holdthe
theweight
weight of
of the
the unit.
unit. for guidelines.
Whenusing
When usingrod
rod hangers,
hangers, allow adequate
adequatespace
spacebetween
betweenthe
thetoptopofofthe unit
the unit
and Standard7,7,the NOTE:
NOTE:Always
Alwaysavoid
avoidplacement
placement ofofUnit
Unit Coolers
Coolers direct
direct above
above doors
andthe
theceiling
ceiling for
for cleaning. To
To comply
complywith
withNSFNSFStandard thearea
areaabove
above
the doors and openings.
and door door openings.
theunit
unitcooler
cooler must
must be sealed or or exposed
exposed ininsuch
suchaaway
waytotofacilitate
facilitatehand
hand
Figure4.4.Large
Figure LargeCoolers
Coolersand
andFreezers
FreezersPlacement
Placement.
Cooleror
Cooler orFreezers
Freezers
where
where one
one wall
wall will not
not
accommodate
accommodate all all required
required
evaporators
evaporatorsoror where
where air
air Cooler or Freezer with Baffle
Cooler or Freezer with Glass
throw
throwdistance
distance must
must be Glass Display Doors
considered.
be Display Doors Glass
considered.
Display
Door
Baffled Unit
Baffled Unit -- Allow
Allow sufficient
sufficient
Where
Where one
one wall evaporator
wall evaporator space between
space between rearrear of
of Unit Cooler
Unit Cooler Elevation
Elevationview
viewofofglass
glassdisplay
display
mounting
mountingisis satisfactory.
satisfactory. and
and wall
wall toto permit
permit free
free return
return of of
air. door
doorcooler or or
cooler freezer. Be Be
freezer. sure air
sure
air. Refer
Refer to to Figures
Figures 1-31 through
(page 3) 3 discharge blows above, not directly
for3)proper
(page space.
for proper space. air discharge blows above, not
at doors. Provide baffle if door
directly at doors. Provide baffle if
extends above blower level.
door extends above blower level.
Defrost
DefrostTroubleshooting
Troubleshooting Field Wiring
Fan Motor The field wiring should enter the areas as provided on the unit. The wiring
Fan Motor Drain Pan
diagram for each unit is located on the inside of the electrical panel door.
If the motor does not operate or it cycles on thermal overload, remove motor
If the motor does not operate or it cycles on thermal overload, remove motor If drain
All fieldpan has should
wiring an ice build-up,
be donedrain
in a line may be frozen.
professional manner The drain
and in accordance
leads from terminal block and apply correct voltage across the leads. If motor
leads from terminal block and apply correct voltage across the leads. If motor line should
with be pitched
all governing sharply
codes. and exit
Before cabinet as
operating quickly
unit, as possible.
double check all wiring
still does not operate satisfactorily, it must be replaced. Before starting the unit,
still does
rotate fannot operate
blades satisfactorily,
to make sure they it must
turn be replaced.
freely Before
and have startingclearance.
sufficient the unit, Sometimes location
connections, andthe
including ambient atterminals.
factory the drain outside
Factoryof cabinet maycan
connections cause
vibrate
rotate fan blades to make sure they turn freely and have sufficient clearance. freeze-up.
loose duringA drain line heater may be required to correct the freeze-up. Any
shipment.
Fan Delay & Defrost Termination Control traps in the drain line must be located in a warm ambient.
Fancontrol
This Delayis & Defrost
a single poleTermination Control
double throw switch. The red lead wire is wired 1. The serial data tag on the unit is marked with the electrical characteristic
toThis control The
is a single pole isdouble
wired throw switch.
with The red motors.
lead wireThe is wired for wiring the unit.
common.
to common.
black wire in series the fan brown Field Wiring
wire is wired The black wire
in series withisthewired in series
defrost with the fan
termination motors. in
solenoid The thebrown
timer. 2. Consult the wiring diagram in the unit cooler and in the condensing
wirebrown
The is wiredand
in series with the defrost
red contacts close andtermination
the black solenoid
and red in the timer. The
contacts open Theunit
fieldfor
wiring
propershould enter the areas as provided on the unit. The wiring
connections.
brownthe
when and red contactsisclose
temperature above and55˚F.
the black and red
The black contacts
and red contactsopen when closethe and diagram for each unit is located on the inside of the electrical panel door.
temperature
the brown and is above 55ºF. Theopen
red contacts black when
and red contacts
the close and
temperature is the
below brown35˚F. 3. Wire wiring
All field type should
shouldbebeofdone
copperin aconductor only
professional and ofand
manner the in
proper size
accordance
Onandinitial“pull
red contacts open when
down”of a warm the temperature
box the fanis belowwill not F.
35ºstart until the coil withtoall
handle the connected
governing load. operating unit, double check all wiring
codes. Before
temperature reaches approximately 35˚F. If the box is still comparatively connections,
4. The unit mustincluding the factory terminals. Factory connections can vibrate
be grounded.
On initial
warm “pullwhen
(60˚F) down”of thea warm
fan box the fan
starts, willblowing
then not start until
this the
warm coil temperature
air over the loose during shipment.
reaches
coil may approximately
cause it to warm 35ºF.upIf the box isand
to 55˚F still comparatively
thus stop the warm (60ºF) when
fan. Therefore, the 5. For multiple evaporator systems, the defrost termination controls should
1. The serial data tag on the unit is marked with the electrical character-
themay
fan fan starts,
recyclethenonblowing this warm
initial “pull down. air” over
This the coil may
control cannot causebe it to warm
adjusted. be wired in series. Follow the wiring diagrams for multiple evaporator
istic for wiring the unit.
up to 55ºF and thus stop the fan. Therefore, the fan may recycle on initial “pull systems carefully. This will assure complete defrost of all evaporators in
If the fan motor fails to start when the control is below 35˚F, disconnect 2. Consult the wiring diagram in the unit cooler and in the condensing
the system.
the fan” motor
down. This control
leads cannot
and check be adjusted.
the motor as described for fan motors. Also unit for proper connections.
check whether current is being supplied at “N” and “4” from the timer. The 3. Multiple
6. Wire type should be
evaporator of copper
systems conductor
should operateonly and
off of of thermostat.
one the proper size
If the
fan delayfan control
motor failsmustto start when 35˚F
be below the control
when is below 35for
checking º
F, disconnect
a closed circuit.the to handle the connected load.
7.
4. If aThe
remote
unit defrost
must betimer is to be used, the timer should be located
grounded.
fan motor leads and check the motor as described for fan motors. Also check
Defrost Heater
whether current is being supplied at “N” and “4” from the timer. The fan delay 5. outside the refrigerated
For multiple evaporatorspace.
systems, the defrost termination controls
Ifcontrol
unit shows should be wired in series. Follow the wiring diagrams for multiple
mustvery little or
be below 35no
º defrosting
F when checkingandfor does not heat,
a closed disconnect heater
circuit. evaporator systems carefully. This will assure complete defrost of all
and check to find if it is burned out. To test, apply correct voltage across heater
or use continuity flashlight battery tester. evaporators in the system.
6. WARNING: All wiring
Multiple evaporator must should
systems be doneoperate
in accordance
off of onewith applicable
thermostat.
Defrost Heater 7. If a remote defrost
Drain Pan very little or no defrosting and does not heat, disconnect heater
If unit shows codes timer is to be
and local used, the timer should be located
ordinances.
Ifand
drain panto
has anifice outside the refrigerated space.
check find it isbuild-up, drain
burned out. Toline
test,may becorrect
apply frozen.voltage
The drain lineheater
across should
beorpitched sharplyflashlight
use continuity and exit cabinet
battery as quickly as possible. Sometimes location
tester.
and ambient at the drain outside of cabinet may cause freeze-up. A drain line WARNING: All wiring must be done in accordance with
heater may be required to correct the freeze-up. Any traps in the drain line applicable codes and local ordinances.
must be located in a warm ambient.
4
4
Unit Coolers
Unit Coolers Figure 3. Spring Mount
Condensate Drain Lines

Condensate Drain Lines Check Out
Check Out and
and Start
Start Up
Up
Either copper or steel drain lines should be used and properly protected from
Either copper or steel drain lines should be used and properly protected from
freezing. In running drain lines, provide a minimum 1/4 inch per foot pitch for WARNING:
NOTE: All adjustable
All adjustable controlsand
controls andvalves
valves must
mustbe befield adjusted
field
freezing. In running drain lines, provide a minimum 1/4 inch per foot pitch for
proper drainage. Drain lines should be at least as large as the evaporator drain to meet
adjusted todesired operation.
meet desired There are no
operation. factory
There arepreset
no
proper drainage. Drain lines should be at least as large as the evaporator drain
connection. All plumbing connections should be made in accordance with controls
factory or valve
preset adjustments.
controls or valveThis includes lowThis
adjustments. pressure,
connection. All plumbing connections should be made in accordance with
local plumbing codes. All condensate drain lines must be trapped, and run to high pressure,
includes adjustable
low pressure, highhead pressure
pressure, systems and
adjustable
local plumbing codes. All condensate drain lines must be trapped, and run to
an open drain. They must never be connected directly to the sewer system. headexpansion
pressurevalves.
systems and expansion valves.
an open drain. They must never be connected directly to the sewer system.
Traps in the drain line must be located in a warm ambient. We recommend a
Traps in the drain line must be located in a warm ambient. We recommend After the installation has been completed, the following points should be
trap on each evaporator drain line prior to any tee connections. Traps located
a trap on each evaporator drain line prior to any tee connections. Traps covered before the system is placed in operation:
outside, or extensive outside runs of drain line must be wrapped with a drain After the installation has been completed, the following points should be
located outside, or extensive outside runs of drain line must be wrapped
line heater. The heater should be connected so that it operates continuously. (a) before
covered Checktheall electrical
system is and refrigerant
placed connections.
in operation:
with a drain line heater and covered with 3/8" minimum thickness pipe
It is recommended that the drain line be insulated to prevent heat loss. A heat Be sure they are all tight.
insulation. The heater should be connected so that it operates continuously. (a)
input of 20 watts per linear foot of drain line for 0˚F (-18˚C) room applications
It is recommended that the drain line be insulated to prevent heat loss. A heat (b) Check
Checkalltheelectrical and refrigerant
room thermostat connections.
for normal operation
and 30 watts per linear foot for -20˚F (-29˚C) rooms is satisfactory. In freezers, and adjust.
Be sure they are all tight.
input of 20 watts per linear foot of drain line for 0˚F (-18˚C) room applications
the evaporator drain pan fitting should be included when heating and (b)
(c) Check
Wiringthe room thermostat
diagrams, instructionfor normal operation
bulletins, etc. attached
and 30 watts per linear foot for -20˚F (-29˚C) rooms is satisfactory. In freezers,
insulating the drain line. to theand condensing
adjust. units should be read and filed for
the evaporator drain pan fitting should be included when heating and
insulating future reference.
Inspect drainthe
pandrain line.
periodically to insure free drainage of condensate. If drain (c) Wiring diagrams, instruction bulletins, etc. attached to the
(d) All fan motors on evaporators should be checked for
pan contains standing water, check for proper installation. The drain pan should condensing units should be read and filed for future reference.
proper rotation. Fan motor mounts should be carefully
beInspect
cleaned drain pan periodically
regularly to insure
with warm soapy free drainage of condensate. If drain
water. (d) All fan motors
checked on evaporators
for tightness should
and proper be checked for proper
alignment.
pan contains standing water, check for proper installation. The drain pan
(e) rotation. Fan hot
Electric and motorgasmounts should
evaporator fanbe carefully
motors checked for
should
should be cleaned regularly with warm soapy water.
be temporarily
tightness and wiredproper alignment.operation until
for continuous
the room
(e) temperature
Electric and hot gas has stabilized.fan motors should be temporarily
evaporator
WARNING: All power must be disconnected before cleaning. Drain (f ) wired
Do not forleave unit unattended
continuous operationuntil
untilthe
thesystem has
room temperature has
pan also serves as cover of hazardous moving parts. reached normal operating conditions and the oil
stabilized.
WARNING:
AllOperationpower must bewithout
of unit disconnected
drain panbefore clean-
constitutes a charge has been properly adjusted to maintain the oil
hazard. ing. Drain pan also serves as cover of hazard- (f ) Do notbetween
level leave unit 1/4unattended
and bottomuntil thesight
of the system has reached
glass.
ous moving parts. Operation of unit without (g) normal
Make sureoperating conditions
all Schrader and are
valve caps the in
oilplace
charge
andhas been
tight.
drain panunits
constitutes a hazard. properly adjusted to maintain the oil level between 1/4 and
Traps on low temperature must be outside of refrigerated enclosures.
Traps subject to freezing temperatures must be wrapped with heat tape and
Operationalbottom of theOut
Check sight glass.
insulated. (g) Make sure all Schrader valve caps are in place and tight.
Traps on low temperature units must be outside of refrigerated enclosures.
Traps subject to freezing temperatures must be wrapped with heat tape and After the system has been charged and has operated for at least two hours at
NOTE: Always avoid placement of Unit Coolers direct above doors
insulated. normal operating conditions without any indication of malfunction, it should
be allowed to operate overnight on automatic controls. Then a thorough
and door openings. Operational Check Out
recheck of the evaporator operation should be made as follows:
NOTE: Always trap single evaporator system drain After
(a) the system
Check has sight
liquid line beenglass
charged
andand has operated
expansion for at least two hours at
valve operation.
lines individually to prevent humidity migration. normal operating
If there conditions
are indications thatwithout any indication
more refrigerant of malfunction,
is required, it should
leak test all
be connections
allowed to operate overnight
and system on automatic
components controls. Then a thorough
and repair
recheck of thebefore
any leaks evaporator
adding operation should be made as follows:
refrigerant.
Figure 5. Condensate Drain Lines
Figure 5. Condensate Drain Lines (b)
(a) Thermostatic
Check liquid expansion valves
line sight glass andmust be checked
expansion valveforoperation.
proper
If theresuperheat settings.
are indications thatFeeler
morebulbs must be
refrigerant in positive
is required, leak test all
contact with the
connections andsuction
systemline and shouldand
components be repair
insulated. Valves
any leaks before
set at high
adding superheat will lower refrigeration capacity. Low superheat
refrigerant.
promotes liquid slugging and compressor
(b) bearing
Thermostatic
washout.expansion valves must be checked for proper superheat
settings.
(c) Check Sensing
defrost bulbs
controls formust be in and
initiation positive contact with the suction
termination
line andand
settings, should be insulated.
length of defrost Valves
period.set atfail
Set high superheat
safe at lengthwill lower +
of defrost
refrigeration capacity. Low superheat promotes liquid slugging and
25%.
compressor20
Example: bearing
minute washout.
defrost + 5 minutes = 25 minute fail safe
(d)
(c) Check
Checkdrain pancontrols
defrost for proper drainage. and termination settings and length
for initiation
(e) Install instruction
of defrost period.card andsafe
Set fail control system
at length of diagram
defrost +for 25%.
use of building manager or owner.
Example: 20 minute defrost + 5 minutes = 25 minute fail safe
(d) Check drain pan for proper drainage.
(e) Install instruction card and control system diagram for use of building
manager or owner.
DRAIN LINE MIN.
PITCH - 1/4”/ FT.
VAPOR SEAL
TRAP
OPEN
DRAIN
5
5
EvaporatorSuperheat
Evaporator Superheat
Installation
Alternative
Alternative and
Superheat Operations Manual
Method
Superheat Method
Check
Check YourSuperheat.
Your Superheat.After
Afterthe
thebox
box temperature
temperature has has reached The most
reachedororisisclose
closetoto
The most accurate
accurate method
method of measuring
of measuring superheat is found by following the
previous procedure, Temperature/Pressure method. superheat is found
However, by method
that following the
reaching
reaching the
the desiredtemperature,
desired temperature,the theevaporator
evaporator superheat
superheatshould
shouldbe
bechecked
previous
checked procedure, Temperature/Pressure
and adjustmentsmademadeififnecessary.
necessary. Generally,
Generally, systems may not always be practical. An alternative method method. However,
which that
will yield method
fairly
and adjustments
Evaporator systemswithwithaadesign
designTDFor of
havea Superheat Refrigerant Glide
may not
to 10˚˚F for maximum efficiency. TD
accurate of always
results is betemperature
the practical. An alternative method:
/ temperature method which will yield fairly
1010 F should asuperheat
superheatvalue
valueof of 66˚˚ to
˚
˚
F should have 10 F for maximum accurate results is the temperature / temperature method:
efficiency. For
systems
systems operating
operating at higher
at higher TD’s, the superheat can be adjusted to 12 ˚
to 15 ˚
1. EPA-mandated
Measure the temperature of warming
the suction line at the
TD’s, the superheat canhas
be adjusted to is12close
To reach ˚
to 15˚
Check Your Superheat. After the box temperature reached or
point1.the bulb
Measure thelower global
temperature
(outlet).has of
potential
the suction line(GWP)
at the levels, the
˚Fto˚F as required.
asreaching
required.the desired temperature, the evaporator superheat should be commercial is clamped
point therefrigeration
bulb is clamped industry
(outlet). increasingly turned to refrigerant
checked and adjustments made if necessary. Generally, systems with a design blends.
2. Measure the temperature of one of the distributor
TD NOTE:
of 10˚F should have Minimum compressor
a superheat value of 6˚ to suction
10˚F forsuperheat
maximum efficiency.
tubes 2.closeMeasure
to the the temperature
evaporator coil (inlet).of one of operate
the distributor
NOTE: Minimum
of 20˚F maycompressor
override suction
these superheat
recommendations
These blends are non-toxic, non-flammable and within the typical
For systems operating at higher TD’s, the superheat can tubes close
be adjusted to 12˚ to
commercial to the evaporator
refrigeration coil (inlet).
operating pressures.
ofon 20˚F may override these
some systems with short line runs. recommendations 3. Subtract the inlet temperature from the outlet
15˚F as required.
on some systems with short line runs. Refrigerant blends
3. temperature.
Subtract such
the as
The R-404A,
inlet R-407A,
temperature
difference R-407C,
is Superheat.
from R-407F, R-448A and
the outlet
To properly determine the superheat of the evaporator, the following procedure R-449A are a temperature.
mixture of components
The differencethat retain their individual evaporating
is Superheat.
To is
properly determine
the method the superheat
Heatcraft of the evaporator, the following procedure and condensing points.
recommends:
NOTE: Minimum compressor suction superheat of 20˚F may override This method will yield fairly accurate results as long as the pressure drop
is the method Heatcraft recommends: This method
Thethrough
range of will yield
thetemperature
evaporator fairly
coil
whereis low.accurate
these results
individual as long asevaporate
components the pressureor drop
these recommendations on some systems with short line runs.
WARNING: If the condensing unit has no flooded through
condense at athe
constant pressure
evaporator coilcalled
is low.refrigerant glide.
WARNING: Ifcondenser
the condensing unit hascontrol,
head pressure no flooded
the With R-404A, the refrigerant glide is approximately 1F and can generally be
condenser
condensing
To properly determine unitpressure
head
the superheat must have
of the the discharge
control, the
evaporator, the following ignored.
pressure
condensing
procedure is the method above
unit
Heatcraft the
mustequivalent
have the105˚F
recommends: discharge With R-407A, R-407C, R-407F, R-448A and R-449A refrigerant glide is
condensing
pressure pressure.
above the equivalent 105˚F much higher (6-10˚F) and yields greater evaporator capacity (with colder
condensing pressure.
WARNING: If the condensing unit has no flooded condenser head evaporator surface temperatures) than R-404A at the same dew point
1. Measure the temperature of the suction line at the point
pressure control, the condensing unit must have
Slim Contour
evaporating temperature.Exclusive Information
the bulb is clamped.
1. Measure thethe temperature of the suction line at the point
discharge pressure above the equivalent 105 ˚F Slim Contour Exclusive Information
the bulb is clamped.
2. Obtain thecondensing
suction pressure that exists in the suction line The Slim Contour has several exclusive features that improve the servicability .
pressure.
at the bulb location by either of the following methods:
2. Obtain the suction pressure that exists in the suction line Two
TheSpeed EC has
Slim Contour Motors
several exclusive features that improve the servicability .
at the bulb
a. location
A gaugeby
ineither of the equalized
the external followingline
methods:
will indicate the Cassette Removal/Replacement
1. Measure the temperature Unit coolers may be equipped with energy saving two-speed EC fan motors
pressure directly of
andthe suction line at the point the bulb is
accurately. Removal
run atof
Cassette modular cassettes in the Slim Contour improve
a loweraccess and the
requiredRemoval/Replaceme
to service the unit cooler. nt
a. A gauge in the external equalized line will indicate the
clamped. which full speed during active refrigeration and at speed during
speed
b. pressure
A gaugedirectly
directlyand accurately.
in the suction line near the the refrigeration off-cycle when room temperature has been reached.
2. Obtain the suction pressure at the access portheader
locatedofon the suction Removal of modular cassettes in the Slim Contour improve access and the
evaporator or directly in the suction the 1. Turn off electricaltofeed to the
theunit.
outlet header.
b. evaporator
A gauge directly
will yieldinthethesame reading Mostspeed required
unit coolers with service
two-speed unit
EC cooler.
motors require field wiring to provide a
suction lineas 2a above.
near the
control input
2.1.Remove to the motors via a factory-installed relay. Refer to the following
3. Convertevaporator
the pressure or obtained
directly in inthe suction
2. above header ofevaporator
to saturated the Turn offthe fan guard
electrical (2 Screws).
feed to the unit.
3. evaporator
Convert bythe pressure
will yield obtained
the in 2a oras
same reading 2b2a
above to
above. table for requirements:
temperature using a temperature-pressure chart. 3.2.Remove
saturated evaporator temperature by using a Removescrews
the fan from modular cassette and pull cassette forward, but do
guard(Figure
(2 Screws).
temperature-pressure
4.3. Subtract
Convert thethe
saturated
pressure chart. infrom
temperature
obtained the
2a or 2bactual suction line not fully remove cassette. 8)
above to Heatcraft Unitscrews
CoolerfromApplications with 2-Speed Fan Motors-
temperature. The difference
saturated evaporator is Superheat.
4.temperature-pressure
Subtract the saturated
temperature by using a
temperature from the actual 4.3.With
Remove
External the
Motorcassette slightly
Control
modular
removed,
Wiring
cassette and pull
reach behind
Requirements the cassette forward,
cassette and unplugbut do
chart. not fully remove cassette. (Figurethe
wired connection. This will separate 8) cassette from unit cooler. (Figure 9)
suction line temperature. The difference is Superheat.
TERMINAL BOARD CONTROL CONTROL
4. Subtract the saturated temperature from the actual
Figure 6.6.Bulb and 5.4.Once
Withthe
the cassette
cassette hasslightly
FACTORY removed, reach CONTROL
been removed from
BOARD the behind the
unit cooler, cassette
the
CONTROL CONTROLand
cassetteFIELD unplug
can
andContact Location UNIT COOLER DEFROST WIRING POINTS
TERMINAL CONTACT CONTACT CONTROL FIELD
Figure
suction Bulb
line Contact
temperature. Location
The difference is Superheat. bewired
PRODUCT
UNIT
connection.
COOLER
stored onTYPE
DEFROST
LINE LINE
PRODUCT
CONTROL
theTYPEunitThis
FACTORY
by will separate
CONTROL
using
PACKAGE
PACKAGE the service
WIRING
FOR the
POINTS
CONTROLclip
FOR
CONTACT
cassette
CURRENTfrom
feature.
CURRENT
CONTACT
unit
(Figure
VOLTAGE
VOLTAGE 10)
WIRING
cooler.
WIRING(Figure 9)
REQUIREMENTS
CONTROL CONTACT
CONTACT RATING REQUIREMENTS
RATING
RATING RATING
Figure 6. Bulb and Contact Location 6.5.ToOnce the cassette,

reinstall cassette has WIRED
been removed
reconnect
FACTORY plug and
NO FIELD fromcassette
slide
WIRING the
N/A
unitback
cooler,
intothe cassette
place.
N/A
Re- can
ALL ALL NEEDED FOR FAN
be
secure stored on
the cassettethe unit by using
by placing
ROOM screws
THERMOSTAT
MOTOR in place.clip feature.N/A
the service
CONTROL (Figure 10)
NO FIELD WIRING
6.ALLTo reinstall
ALL cassette, reconnect
INTELLIGEN plug
NEEDED FOR and
FAN slide
N/A cassette
NIA back into
N/A place. Re-
secure the cassette by placing MOTORscrews in place.
CONTROL
NO FIELD WIRING
QUICK RESPONSE
ALL ALL NEEDED FOR FAN N/A N/A N/A
CONTROLLER
MOTOR CONTROL
WIRE TO 2-POLE
TERMINAL BLOCK
LOW PROFILE ALL
NEXT TO CONTROL
BOARD
CENTER MOUNT / WIRE TO FAN
LOW VELOCITY ALL CONTROL RELAY
Figure 7. Multiple Evaporators Figure
CENTER 8.
MOUNT Figure 9.
Cassette Removal (Step 3) BEACONCassette
11
COIL
5VA MIN
Figure 10. 18AWG 30V MIN
30V MIN
(2 WIRES)
Removal (Step 4)
WIRE TO FAN Cassette Removal (Step 5)
Figure 7. Multiple Evaporators MEDIUM PROFILE ALL CONTROL RELAY
COIL
Figure 7. Multiple Evaporators Figure 8.

Service
LARGE UNIT Clip Feature FigureWIRE
9. TO FAN Figure 10.
Cassette Removal
ALL (Step 3) CONTROL
Cassette RELAY (Step 4)
Removal Cassette Removal (Step 5)
COOLER
COIL
The Slim Contour features a service clip on all of its modular cassettes. The
service clip is exclusive to Slim Contour cassettes and is designed to improve
Service
the serviceability
LOW PROFILE
Clip
AIR
of the unit cooler. The
Feature
K / Tl
service clip features two separate
hooks that can be used to aide in common maintenance.
The Slim ELECTRIC/
LOW PROFILE
Contour features a service clip on all of its modular cassettes. The
K /4
service
The clip
service clip
HOT that is featured
isGAS
exclusive onContour
to Slim top of the cassettes
cassettes motor
and can be used
is designed to
to improve
suspend the cassetteofwhile
the serviceability being
the unit removed
cooler. Thetoservice
assist in removing
clip featuresthe power
two separate
CENTER MOUNT /
connection
LOW VELOCITY thatof
hooks can
AIRthebe
cassette(Figure
used to aide 11.).Tl The
/ T3 Slimmaintenance.
in common Contour cassette also can be
suspended
CENTER MOUNT from the drain pan using the screw mounts 25VA min
(Figure
300V min
12.)
The service
CENTER MOUNT / clip that is featured on top of the cassettes motor can be used to
ELECTRIC/
LOW VELOCITY J/4
suspend the
CENTER MOUNT cassette while being removed
HOT GAS to assist in removing the power
18AWG 300V
connection of the cassette(Figure
NONE
K / Tl 11.).
115V orThe
208V; Slim Contour cassette also can be
MIN (2 WIRES)
suspended
MEDIUM PROFILE from the drain pan using the screw mounts (Figure 12.)
AIR
1 Phase
K /4 460V; 1Phase
ELECTRIC/
MEDIUM PROFILE K /4
HOT GAS
LARGE UNIT Figure 11. Figure 12.

AIR Tl/T2
COOLER
Service Clip (Feature 1) Service Clip (Feature 2)
4VA 192V min
6 LARGE UNIT ELECTRIC/
T1/T2
COOLER HOT GAS
Figure 11. Figure 12.

66
Unit Coolers
Table 3. Expansion Valve Selection 180# Head Pressure Valve
BTUH at R-404A / R-507A R-404A / R-507A R-407A / R-407F R-407A / R-407F R-448A / R-449A R-448A / R-449A
about -20˚F / -29˚C Evap. +25˚F / -4˚C Evap. -20˚F / -29˚C Evap. +25˚F / -4˚C Evap. -20˚F / -29˚C Evap. +25˚F / -4˚C Evap.
10˚F T.D. Sporlan Alco Sporlan Alco Sporlan Alco Sporlan Alco Sporlan Alco Sporlan Alco
3,000-3,500 SQE-1 (1/4T)-SZP HFESC-1/4-SZ SQE-1 (1/4T)-SC HFESC-1/4-SC SQE-1 (3/4T)-NZP HFESC-1-HZ SQE-0 (1/3T)-NC HFESC-1/2-HC SQE-1 (1/4T)-DZP HFESC-1/2-BZ SQE-0 (1/6T)-DC HFESC-1/2-BC
3,600-5,000 SQE-2 (1/2T)-SZP HFESC-1/2-SZ SQE-1 (1/4T)-SC HFESC-1/4-SC SQE-1 (3/4T)-NZP HFESC-1-HZ SQE-1 (3/4T)-NC HFESC-1-HC SQE-1 (1/4T)-DZP HFESC-1-BZ SQE-1 (1/4T)-DC HFESC-1-BC
5,500-7000 SQE-3 (1T)-SZP HFESC-1-SZ SQE-2 (1/2T)-SC HFESC-1/2-SC SQE-2 (1T)-NZP HFESC-1-1/2-HZ SQE-1 (3/4T)-NC HFESC-1-HC SQE-2 (1/2T)-DZP HFESC-1-BZ SQE-1 (1/4T)-DC HFESC-1-BC
7,500-8,000 SQE-3 (1T)-SZP HFESC-1-SZ SQE-3 (1T)-SC HFESC-1-SC SQE-3 (1-1/2T)-NZP HFESC-1-1/2-HZ SQE-1 (3/4T)-NC HFESC-1-1/2-HC SQE-2 (1/2T)-DZP HFESC-1-BZ SQE-2 (1/2T)-DC HFESC-1-BC
8,500-10,000 SQE-4 (1-1/2T)-SZP HFESC-1-1/2-SZ SQE-3 (1T)-SC HFESC-1-SC SQE-3 (1-1/2T)-NZP HFESC-2-HZ SQE-2 (1T)-NC HFESC-1-1/2-HC SQE-3 (1T)-DZP HFESC-1-1/2-BZ SQE-2 (1/2T)-DC HFESC-1-1/2-BC
10,500-11,000 SQE-4 (1-1/2T)-SZP HFESC-1-1/2-SZ SQE-4 (1-1/2T)-SC HFESC--1-1/2-SC SQE-4 (2-1/2T)-NZP HFESC-2-HZ SQE-3 (1-1/2T)-NC HFESC-1-1/2-HC SQE-3 (1T)-DZP HFESC-1-1/2-BZ SQE-2 (1/2T)-DC HFESC-1-1/2-BC
11,500-13,000 SQE-4 (1-1/2T)-SZP HFESC-1-1/2-SZ SQE-4 (1-1/2T)-SC HFESC--1-1/2-SC SQE-4 (2-1/2T)-NZP HFESC-2-1/2-HZ SQE-3 (1-1/2T)-NC HFESC-2-HC SQE-4 (1-1/2T)-DZP HFESC-2-BZ SQE-3 (1T)-DC HFESC-1-1/2-BC
13,500-15,000 SQE-4 (1-1/2T)-SZP HFESC-1-1/2-SZ SQE-4 (1-1/2T)-SC HFESC--1-1/2-SC SQE-4 (2-1/2T)-NZP HFESC-2-1/2-HZ SQE-3 (1-1/2T)-NC HFESC-2-HC SQE-4 (1-1/2T)-DZP HFESC-2-BZ SQE-3 (1T)-DC HFESC-2-BC
15,500-17,000 SQE-5 (2T)-SZP HFESC-2-SZ SQE-4 (1-1/2T)-SC HFESC--1-1/2-SC SQE-4 (2-1/2T)-NZP HFESC-3-HZ SQE-4 (2-1/2T)-NC HFESC-2-1/2-HC SQE-4 (1-1/2T)-DZP HFESC-2-1/2-BZ SQE-4 (1-1/2T)-DC HFESC-2-BC
17,500-20,000 SQE-5 (2T)-SZP HFESC-2-SZ SQE-5 (2T)-SC HFESC-2-SC SQE-4 (2-1/2T)-NZP HFESC-3-HZ SQE-4 (2-1/2T)-NC HFESC-2-1/2-HC SQE-4 (1-1/2T)-DZP HFESC-2-1/2-BZ SQE-4 (1-1/2T)-DC HFESC-2-1/2-BC
20,500-24,000 SQE-6 (3T)-SZP HFESC-3-1/2-SZ SQE-6 (3T)-SC HFESC-3-1/2-SC SQE-5 (3-1/2T)-NZP HFESC-5-1/2-HZ SQE-4 (2-1/2T)-NC HFESC-3-HC SQE-5 (2T)-DZP HFESC-3-1/2-BZ SQE-4 (1-1/2T)-DC HFESC-3-1/2-BC
24,500-28,000 SSE-4-ZP HFESC-3-1/2-SZ SQE-6 (3T)-SC HFESC-3-1/2-SC SQE-6 (5T)-NZP HFESC-5-1/2-HZ SQE-5 (3-1/2T)-NC HFESC-3-HC SQE-5 (2T)-DZP HFESC-3-1/2-BZ SQE-5 (2T)-DC HFESC-3-1/2-BC
28,500-34,000 SSE-4-ZP HFES-5-SZ SSE-4-C HFES-5-SC SNE-5-ZP HFESC-5-1/2-HZ SQE-5 (3-1/2T)-NC HFESC-5-1/2-HC SQE-6 (3T)-DZP HFES-6-BZ SQE-5 (2T)-DC HFESC-3-1/2-BC
34,500-40,000 SSE-6-ZP HFES-7-SZ SSE-6-C HFES-7-SC SNE-8-ZP HFES-8-HZ SQE-6 (5T)-NC HFESC-5-1/2-HC SDE-4-ZP HFES-6-BZ SQE-6 (3T)-DC HFES-6-BC
40,500-50,000 SSE-7-ZP HFES-7-SZ SSE-6-C HFES-7-SC ONE-10-ZP HFES-8-HZ SQE-6 (5T)-NC HFESC-5-1/2-HC SDE-4-ZP HFES-6-BZ SDE-4-C HFES-6-BC
50,500-60,000 SSE-7-ZP HFES-7-SZ SSE-7-C HFES-7-SC ONE-15-ZP HFES-10-HZ SNE-5-C HFESC-5-1/2-HC SDE-6-ZP HFES-8-1/2-BZ SDE-4-C HFES-6-BC
60,500-70,000 OSE-12-ZP TRAE-12-SZ OSE-9-C HFES-10-SC ONE-15-ZP HFES-15-HZ SNE-8-C HFES-8-HC SDE-7-ZP HFES-8-1/2-BZ SDE-6-C HFES-8-1/2-BC
70,500-80,000 OSE-12-ZP TRAE-12-SZ OSE-9-C HFES-10-SC ONE-15-ZP HFES-15-HZ SNE-8-C HFES-10-HC SDE-7-ZP HFES-10-1/2-BZ SDE-6-C HFES-8-1/2-BC
80,500-90,000 OSE-12-ZP TRAE-12-SZ OSE-9-C HFES-10-SC ONE-20-ZP HFES-15-HZ ONE-10-C HFES-15-HC ODE-12-ZP HFES-10-1/2-BZ SDE-7-C HFES-10-1/2-BC
90,500-100,000 OSE-12-ZP TRAE-12-SZ OSE-12-C HFES-13-SC ONE-20-ZP TRAE-20-HZ ONE-10-C HFES-15-HC ODE-17-ZP HFES-16-BZ SDE-7-C HFES-10-1/2-BC
100,500-110,000 OSE-21-ZP TRAE-20-SZ OSE-12-C HFES-13-SC ONE-20-ZP TRAE-20-HZ ONE-15-C TRAE-15-HC ODE-17-ZP HFES-16-BZ ODE-12-C HFES-16-BC
130,500-140,000 OSE-30-ZP TRAE-30-SZ OSE-21-C TRAE-20-SC ONE-30-ZP TRAE-30-HZ ONE-15-C TRAE-15-HC ODE-17-ZP HFES-20-BZ ODE-12-C HFES-16-BC
NOTES:
1. Selections are optimized for systems using an air-cooled condensing unit.
2. For Medium temperature R507(A), valve power element will use a "P" code for refrigerant
3. Use R407A/R407F selections as a guide for R22/R407C applications, valve power element will use a "V" code for refrigerant (Sporlan)
4. An equivalent valve may be used in place of selection.

3,000-4,000 SBFSE-AA-ZP HFESC-1/2-SZ SBFSE-AA-C HFESC-1/2-SC SBFNE-AA-ZP HFESC-1-HZ SBFNE-AA-C HFESC-1/2-HC SBFDE-AA-ZP HFESC-1/2-BZ SBFDE-AA-C HFESC-1/2-BC
4,100-5,000 SBFSE-AA-ZP HFESC-1/2-SZ SBFSE-A-C HFESC-1-SC SBFNE-AA-ZP HFESC-1-HZ SBFNE-AA-C HFESC-1-HC SBFDE-AA-ZP HFESC-1-BZ SBFDE-AA-C HFESC-1-BC
5,500-7000 SBFSE-A-ZP HFESC-1-SZ SBFSE-A-C HFESC-1-SC SBFNE-A-ZP HFESC-1-HZ SBFNE-AA-C HFESC-1-HC SBFDE-AA-ZP HFESC-1-BZ SBFDE-AA-C HFESC-1-BC
7,500-8,000 SBFSE-A-ZP HFESC-1-SZ SBFSE-A-C HFESC-1-SC SBFNE-A-ZP HFESC-1-1/2-HZ SBFNE-A-C HFESC-1-1/2-HC SBFDE-A-ZP HFESC-1-1/2-BZ SBFDE-A-C HFESC-1-1/2-BC
8,500-10,000 SBFSE-A-ZP HFESC-1-SZ SBFSE-A-C HFESC-1-SC SBFNE-A-ZP HFESC-1-1/2-HZ SBFNE-A-C HFESC-1-1/2-HC SBFDE-A-ZP HFESC-1-1/2-BZ SBFDE-A-C HFESC-1-1/2-BC
10,500-11,000 SBFSE-A-ZP HFESC-1-SZ SBFSE-B-C HFESC-2-SC SBFNE-A-ZP HFESC-2-HZ SBFNE-A-C HFESC-2-HC SBFDE-A-ZP HFESC-2-BZ SBFDE-A-C HFESC-2-BC
11,500-13,000 SBFSE-B-ZP HFESC-1-1/2-SZ SBFSE-B-C HFESC-2-SC SBFNE-B-ZP HFESC-2-HZ SBFNE-A-C HFESC-2-HC SBFDE-A-ZP HFESC-2-BZ SBFDE-A-C HFESC-2-BC
13,500-15,000 SBFSE-B-ZP HFESC-1-1/2-SZ SBFSE-B-C HFESC-2-SC SBFNE-B-ZP HFESC-3-HZ SBFNE-A-C HFESC-2-1/2-HC SBFDE-A-ZP HFESC-2-1/2-BZ SBFDE-A-C HFESC-2-1/2-BC
15,500-17,000 SBFSE-C-ZP HFESC-2-SZ SBFSE-B-C HFESC-2-SC SBFNE-B-ZP HFESC-3-HZ SBFNE-B-C HFESC-2-1/2-HC SBFDE-B-ZP HFESC-2-1/2-BZ SBFDE-B-C HFESC-2-1/2-BC
17,500-20,000 SBFSE-C-ZP HFESC-2-SZ SBFSE-C-C HFESC-3-1/2-SC SBFNE-B-ZP HFESC-3-HZ SBFNE-B-C HFESC-3-HC SBFDE-B-ZP HFESC-3-1/2-BZ SBFDE-B-C HFESC-2-1/2-BC
20,500-24,000 SBFSE-C-ZP HFESC-3-1/2-SZ SBFSE-C-C HFESC-3-1/2-SC SBFNE-C-ZP HFESC-5-1/2-HZ SBFNE-B-C HFESC-3-HC SBFDE-C-ZP HFESC-3-1/2-BZ SBFDE-B-C HFESC-3-1/2-BC
24,500-28,000 OSE-6-ZP HFES-5-SZ SBFSE-C-C HFESC-3-1/2-SC SBFNE-C-ZP HFESC-5-1/2-HZ SBFNE-B-C HFESC-5-1/2-HC SBFDE-C-ZP HFES-6-BZ SBFDE-B-C HFES-6-BC
28,500-34,000 OSE-6-ZP HFES-5-SZ OSE-6-C HFES-5-SC SBFNE-C-ZP HFESC-5-1/2-HZ SBFNE-C-C HFESC-5-1/2-HC SBFDE-C-ZP HFES-6-BZ SBFDE-C-C HFES-6-BC
34,500-40,000 OSE-6-ZP HFES-7-SZ OSE-6-C HFES-7-SC ONE-10-C HFES-8-HZ SBFNE-C-C HFESC-5-1/2-HC ODE-7-ZP HFES-6-BZ SBFDE-C-C HFES-6-BC
40,500-50,000 OSE-9-ZP HFES-10-SZ OSE-6-C HFES-7-SC ONE-10-C HFES-8-HZ SBFNE-C-C HFES-8-HC ODE-7-ZP HFES-8-1/2-BZ ODE-7-C HFES-6-BC
50,500-60,000 OSE-9-ZP HFES-10-SZ OSE-9-C HFES-7-SC ONE-15-ZP HFES-10-HZ ONE-10-C HFES-8-HC ODE-12-ZP HFES-10-1/2-BZ ODE-7-C HFES-8-1/2-BC
60,500-70,000 OSE-12-ZP TRAE-12-SZ OSE-9-C HFES-10-SC ONE-15-ZP HFES-10-HZ ONE-10-C HFES-10-HC ODE-12-ZP HFES-10-1/2-BZ ODE-7-C HFES-10-1/2-BC
70,500-80,000 OSE-12-ZP TRAE-12-SZ OSE-9-C HFES-10-SC ONE-15-ZP HFES-15-HZ ONE-10-C HFES-10-HC ODE-12-ZP HFES-16-BZ ODE-12-C HFES-10-1/2-BC
90,500-100,000 OSE-21-ZP TRAE-20-SZ OSE-12-C HFES-13-SC ONE-20-ZP TRAE-20-HZ ONE-15-C HFES-15-HC ODE-17-ZP HFES-16-BZ ODE-12-C HFES-16-BC
100,500-110,000 OSE-21-ZP TRAE-20-SZ OSE-12-C HFES-13-SC ONE-20-ZP TRAE-20-HZ ONE-15-C HFES-15-HC ODE-17-ZP HFES-16-BZ ODE-12-C HFES-16-BC
130,500-140,000 OSE-30-ZP TRAE-30-SZ OSE-21-C TRAE-20-SC ONE-30-ZP TRAE-30-HZ ONE-20-C TRAE-20-HC ODE-28-ZP - ODE-17-C -
NOTES:
7
Unit Coolers

3,000-3,500 SBFSE-AA-ZP HFESC-1/2-SZ SBFSE-A-C HFESC-1/2-SC SBFNE-AA-ZP HFESC-1-HZ SBFNE-AA-C HFESC-1/2-HC SBFDE-AA-ZP HFESC-1-BZ SBFDE-AA-C HFESC-1/2-BC
3,600-5,000 SBFSE-A-ZP HFESC-1-SZ SBFSE-A-C HFESC-1-SC SBFNE-AA-ZP HFESC-1-1/2-HZ SBFNE-AA-C HFESC-1-HC SBFDE-AA-ZP HFESC-1-BZ SBFDE-AA-C HFESC-1-BC
5,500-7000 SBFSE-A-ZP HFESC-1-SZ SBFSE-B-C HFESC-1-1/2-SC SBFNE-A-ZP HFESC-1-1/2-HZ SBFNE-AA-C HFESC-1-1/2-HC SBFDE-A-ZP HFESC-1-1/2-BZ SBFDE-A-C HFESC-1-1/2-BC
7,500-8,000 SBFSE-A-ZP HFESC-1-SZ SBFSE-B-C HFESC-2-SC SBFNE-A-ZP HFESC-2-HZ SBFNE-A-C HFESC-1-1/2-HC SBFDE-A-ZP HFESC-1-1/2-BZ SBFDE-A-C HFESC-1-1/2-BC
8,500-10,000 SBFSE-B-ZP HFESC-1-1/2-SZ SBFSE-B-C HFESC-2-SC SBFNE-A-ZP HFESC-3-HZ SBFNE-A-C HFESC-2-HC SBFDE-A-ZP HFESC-2-BZ SBFDE-A-C HFESC-1-1/2-BC
10,500-11,000 SBFSE-B-ZP HFESC-1-1/2-SZ SBFSE-B-C HFESC-2-SC SBFNE-B-ZP HFESC-3-HZ SBFNE-A-C HFESC-2-HC SBFDE-A-ZP HFESC-2-BZ SBFDE-A-C HFESC-1-1/2-BC
11,500-13,000 SBFSE-B-ZP HFESC-1-1/2-SZ SBFSE-C-C HFESC-3-1/2-SC SBFNE-B-ZP HFESC-3-HZ SBFNE-A-C HFESC-2-1/2-HC SBFDE-A-ZP HFESC-2-1/2-BZ SBFDE-A-C HFESC-2-BC
13,500-15,000 SBFSE-C-ZP HFESC-2-SZ SBFSE-C-C HFESC-3-1/2-SC SBFNE-B-ZP HFESC-3-HZ SBFNE-B-C HFESC-2-1/2-HC SBFDE-B-ZP HFESC-2-1/2-BZ SBFDE-B-C HFESC-2-1/2-BC
15,500-17,000 SBFSE-C-ZP HFESC-2-SZ SBFSE-C-C HFESC-3-1/2-SC SBFNE-B-ZP HFESC-5-1/2-HZ SBFNE-B-C HFESC-3-HC SBFDE-B-ZP HFESC-3-1/2-BZ SBFDE-B-C HFESC-2-1/2-BC
17,500-20,000 SBFSE-C-ZP HFESC-3-1/2-SZ OSE-6-C HFES-5-SC SBFNE-C-ZP HFESC-5-1/2-HZ SBFNE-B-C HFESC-3-HC SBFDE-B-ZP HFESC-3-1/2-BZ SBFDE-B-C HFESC-2-1/2-BC
20,500-24,000 OSE-6-ZP HFES-5-SZ OSE-6-C HFES-5-SC SBFNE-C-ZP HFESC-5-1/2-HZ SBFNE-B-C HFESC-5-1/2-HC SBFDE-C-ZP HFES-6-BZ SBFDE-B-C HFESC-3-1/2-BC
24,500-28,000 OSE-6-ZP HFES-5-SZ OSE-6-C HFES-7-SC SBFNE-C-ZP HFESC-5-1/2-HZ SBFNE-C-C HFESC-5-1/2-HC SBFDE-C-ZP HFES-6-BZ SBFDE-C-C HFES-6-BC
28,500-34,000 OSE-6-ZP HFES-5-SZ OSE-6-C HFES-7-SC ONE-10-C HFES-8-HZ SBFNE-C-C HFESC-5-1/2-HC ODE-7-ZP HFES-6-BZ SBFDE-C-C HFES-6-BC
34,500-40,000 OSE-9-ZP HFES-7-SZ OSE-9-C HFES-10-SC ONE-10-C HFES-10-HZ SBFNE-C-C HFES-8-HC ODE-7-ZP HFES-8-1/2-BZ ODE-7-C HFES-6-BC
40,500-50,000 OSE-9-ZP HFES-7-SZ OSE-9-C HFES-10-SC ONE-10-C HFES-10-HZ ONE-10-C HFES-8-HC ODE-7-ZP HFES-8-1/2-BZ ODE-7-C HFES-8-1/2-BC
50,500-60,000 OSE-12-ZP TRAE-12-SZ OSE-12-C HFES-10-SC ONE-15-ZP HFES-15-HZ ONE-10-C HFES-10-HC ODE-12-ZP HFES-10-1/2-BZ ODE-7-C HFES-10-1/2-BC
70,500-80,000 OSE-21-ZP TRAE-20-SZ OSE-12-C HFES-13-SC ONE-20-ZP TRAE-20-HZ ONE-10-C HFES-15-HC ODE-12-ZP HFES-16-BZ ODE-12-C HFES-10-1/2-BC
80,500-90,000 OSE-21-ZP TRAE-20-SZ OSE-21-C TRAE-20-SC ONE-20-ZP TRAE-20-HZ ONE-15-C TRAE-15-HC ODE-17-ZP HFES-16-BZ ODE-12-C HFES-10-1/2-BC
120,500-130,000 OSE-30-ZP TRAE-30-SZ OSE-30-C TRAE-30-SC ONE-30-ZP TRAE-30-HZ ONE-20-C TRAE-20-HC ODE-28-ZP - ODE-17-C HFES-20-BC
130,500-140,000 OSE-30-ZP TRAE-30-SZ OSE-30-C TRAE-30-SC ONE-30-ZP TRAE-30-HZ ONE-20-C TRAE-20-HC ODE-28-ZP - ODE-17-C HFES-20-BC
NOTES:
8
method of subcooling will normally provide no more than 20˚F subcooling
on high pressure systems. The amount of subcooling will depend on the Alternating Evaporator System
design and size of the heat exchanger and on the operating suction and In the alternating evaporator hot gas defrost system, a third line is taken
discharge pressures. An additional benefit from the use of the suction to off the compressor discharge line as the re-evap system. It is piped with
liquid type heat exchanger is that it can help raise the superheat in the solenoids at each evaporator, so that hot gas defrost is accomplished on one
LiquidsuctionLines line to prevent liquid return to the compressor via the suction line. Three or more Pipe System while the remaining evaporators continue to function
evaporators
Unit Coolers
LiquidGenerally,
lines should heat exchangers
be sized forare not recommended
a minimum pressure drop on R-22 low temperature Theinthree
to prevent
liquid line,
to the
pipemanner.
a normal system (sometimes
oneliquid
main for suction
The liquid from
line and line,it and
called re-evap.)evaporators
defrosting
one for hot
is necessary thatgas 75%
uses three pipes:
line.
or In addition,
greater
one for
is reintroduced
a re- be
capacity
systems.Flashing
“flashing”. However, in they
the liquidhave lines proved would necessary
createon short, well
additional insulated
pressure drop
andsuction line runs to
poor expansion provide
valve superheat
operation. at the compressor.
If a system requires long liquid lines evaporator
retained accumulator
in the normalisrefrigeration
used at the suction cycle tooutlet
offset of thethe evaporator.
capacity that isThe
being
Hotfrom Gas theDefrost
receiver to the Systems
evaporator or if the liquid has to rise vertically hotremoved
gas is taken by thefrom theon
units discharge
the hot gas line defrost.
between the compressor and the
upwardHot Gas Defrost
any distance, losses should be calculated to determine whetherThree
theSystems Pipe System
condenser, through a hot gas solenoid valve, then to the evaporator drain
Hot Gas
or not Defrost
a heat systems
exchanger can is be described
required. The use asofreverse
a suction cycle,to re-evap.,
liquid heat or pan IMPORTANT:
circuit, distributor tee, through the coil. See the Three-Pipe Defrost
Liquid
alternating Hot Gas Defrost systems
Lines
evaporator. Pleasetosee canmanual
be described H-IM-HGD as reverse for Mohave™cycle, re-evap., systems or TheThree threePipepipe systemfor
System (sometimes called re-evap.) uses three pipes: one for
Piping Diagram typical piping
It is imperative that at the evaporator coil.evaporator
on
exchanger
alternating
Heatcraft
mayevaporator.
Website:
be used subcool
Please
www.heatcraftrpd.com see the liquid to
manual prevent
H-IM-HGD flashing.
for Mohave™ This systems. liquid
The line,pipe
three onesystem
for suction line, and
(sometimes onewith
called for the
hot alternating
re-evap.) gas
uses line.
three Inpipes:
addition, hot
one aforre-
Liquid lines should
method be sized will
of subcooling for anormally
minimum pressure
provide no drop
moreto than prevent
20 F subcooling evaporator accumulator
˚
gas is defrost
usedand system,
at the no more
suction that 25%
outlet ofInthe ofevaporator.
the operating The
“flashing”. Flashing
onRefrigerant
high pressure in the liquidThe
systems. linesamount
would create additional
of subcooling willpressure
depend drop liquid Alternating
line, one for
on the hot gas is taken fromrefrigeration Evaporator
suction line, System
one
loadline for
be in hot gas
defrost theline.
at any addition,
time. a re-
Piping the discharge between compressor
Refrigerant
and poor
design expansion
and Piping
size valve
of the operation.
heat exchangerIf a system and requires
on the long liquid
operating lines and evaporator
suction accumulator
In the alternating is used
evaporator at hot
the gas
suction outlet
defrost of the
system, third line and
a evaporator. is The the
taken
theInstall
from discharge receiver all refrigerant
to
pressures.the components
evaporator
An or if in accordance
the liquid has to with
rise applicable
vertically local andcondenser,
hot gasoff is
the through
taken fromathe
compressor hot gas solenoid
discharge
discharge line valve,
lineasbetween
the then
re-evapthe to the evaporator
compressor
system. It is and
piped the drain
with
Install
upward national
allanyrefrigerant
distance,codescomponents
the inadditional
andlosses accordance
should
benefit
in accordancewith from practice
good with
the use of
applicableforthe suction
properlocal system to
and pan condenser, Hotdistributor
circuit, gas
through line
a hot sizes
tee, through
gas forso
solenoid R-22,
the R404A
coil.hot
valve, See
then and
thedefrost
toThree-Pipe R507
the evaporator Defrost Piping
drain
liquid type
operation. heat
Theexchanger
thermostatic is that itbe
expansion can calculated
helpvalveraise tothe
must
determine
superheat
be the
whether
in the
externally Diagram
solenoids
pan circuit, for
at each
typical
distributor
evaporator,
piping
tee, at the
through
that
evaporator
the coil.
gas
coil.
See the Three-Pipe
is accomplished
Defrost
on one
national
or not a
suction codes
heat line and
exchanger
to in
prevent accordance
is required.
liquid with
The
return use
to good
of
the a practice
suction
compressor to for
liquid
via proper
the heat system
suction line. or more System Capacity
evaporators Equivalent Discharge
while the remaining evaporators continue to function Length (Ft.)
operation.
exchanger equalized
The betype.
maythermostaticused Ittocan be mounted
expansion
subcool the valve
liquid inside
must the
beunit
to prevent theon end compartment.
externally
flashing. This equalized MountPiping Diagram for typical piping at the evaporator coil.
Generally, heat exchangers in a normalBTU/Hr manner. The liquid25 from defrosting 50 evaporators
75 is 100
reintroduced 150
type.
method It thecan
of expansion
be
subcooling mounted valve
will bulbare
inside
normally onthenot
provide
recommended
a horizontal
unit end
no run
more of
compartment.
than
R-22
suction20 F
low temperature
˚ line as close as
Mount
subcooling the Alternating Evaporator System
systems. However, they have proved necessary onprovided
short, well insulated to the main
Alternating liquid line and
4,000
Evaporator Systemit is1/2
necessary1/2 that 75% or 1/2greater capacity 1/2 be 1/2
possible
on high pressure
expansion valve to the
systems. suction
aThe header.
amountrun Use the
of subcooling clamps will depend
as close on with
as the the valve to
suction
fasten line bulbruns to onprovide horizontal superheat ofatsuction line
the line-to-line
compressor. possible
In theretained
alternating in the
5,000 normal refrigeration
evaporator
evaporator hotgas
hot 1/2defrost
gas cycle1/2
defrost to offsetathe
system,
system, 1/2
third
a third
capacity 1/2
lineisistaken
line
that
takenis offbeing
1/2
design
to and
the suction sizethe of bulb
header.the heat securely
Use exchanger
the clampsso there and is aon
provided tight
thewithoperatingthe valve contact
suction between
and
to fasten the the removed by the units on the hot gas defrost.
discharge
bulb bulb
securely and
pressures.
so the
there suction
An additional
is a line. Suction
tight benefitand
line-to-line from hot thegas
contact use connections
of the suction
between the are
bulb made
to and on the compressor
off the compressor discharge
6,000discharge lineline
as the 1/2re-evap
as the re-evap system.
1/2 system. It is 1/2
piped
It is pipedwith5/8 solenoids 5/8
with
Hot Gas
outside Defrost Systems theoutside at each evaporator,
solenoids at each7,000 so that hot
evaporator, sogasthat defrost
hot gasis1/2 accomplished
defrost 5/8 on one
is accomplished 5/8oronmoreone 5/8
liquid
the type
suction line.of
heat the unit.and
exchanger
Suction is thathot itgas canconnections
help raise the aresuperheat
made oninthe IMPORTANT: 1/2
Hot
suction
of the unit. Gas
line to Defrost
prevent
Suction lines should be systems
liquid can
return beto
sloped described
the
towards compressoras
thereverse viacycle,
compressor the suction re-evap.,
at the rate line. orof oneevaporators while
or more evaporators thewhile
8,000 remaining evaporators
the remaining
1/2 continuecontinue
evaporators
5/8 to5/8 function to in
5/8a normal 5/8
function
Generally, (1) heat
alternating inch exchangers
per ten (10) are
evaporator. feet not
Please for recommended
see manual
good oil return. H-IM-HGD
on R-22 low
Vertical for
risers temperature
Mohave™
of moresystems. than four in a normal
manner. liquidItfrom
Themanner. is
Theimperative
liquid from
defrosting that with the alternating
defrosting
evaporators evaporators
is reintroduced evaporator to thehot
is reintroduced main
9,000
gas defrost system, 1/2 no that 5/8 5/8 5/8be 5/8
Suction
systems.(4) lines
However, should
feet should theybe havesloped
be trapped
towards
proved the compressor
necessary
at the bottomon short,
with
at
well
a P-trap.
rate of one (1) to the line
theinsulated
If a P-trap is used, liquid the
mainand liquid
it isline and it isthat
necessary 75% ormore
necessary greaterthatcapacity
75% or25%greaterof be
the operating
capacity
retained in the
Refrigerant
suction
inch line
tenruns
perexpansion (10) to Piping
feetprovide
for good superheat
oil return. at the compressor.
Vertical risers of more than four (4) retainedrefrigeration
normal 10,000
in the normal refrigeration
refrigeration
cycle to load
offset 1/2 be capacity
cycle
the in to 5/8that
defrost
offset atthe
any
is 5/8
time.removed
capacity
being that5/8 is being
by the 5/8
valve bulb should be installed between the unit and the trap. removed by the units on the hot gas defrost.
feet should
Install all berefrigerant
trapped atcomponents the bottominwith a P-trap.with
accordance If a applicable
P-trap is used, local the and units on the hot12,000 gas defrost. 5/8 5/8 5/8 7/8 7/8
Hotnational
Gas
expansion ReverseDefrost
valve codes bulb
CycleandSystems
shouldSystem
in be installed
accordance with between
good practicethe unitfor and the trap.
proper system Hot gas line
14,000 sizes for R-22,
5/8 R404A 5/8 and R507 7/8 7/8 7/8
IMPORTANT:
Hot Gas Defrost
operation. systems
The can
thermostatic be described
expansion as reverse
valve
The hot gas unit coolers can be used in reverse cycle hot gas defrost systems must cycle,be re-evap.,
the externally or IMPORTANT: It
16,000is imperative that
5/8 with the alternating
5/8 7/8 evaporator 7/8 hot 7/8
System Capacity
It is18,000
imperative Equivalent Discharge Length (Ft.)
Reverse
alternating
equalized
using Cycle
evaporator.
type.
multiple System Please
It evaporators
can see manual
be mounted connectedinside H-IM-HGD
the
to one for
endMohave™
unitcondensing compartment. systems.
unit. Mount not
Generally, gas defrost thatsystem, with
5/8no themorealternating
that 25%
7/8 evaporator
of
7/8the operating hot7/8 7/8
BTU/Hr
gasrefrigeration
defrost system, 25
load nobe more 50 25%
that
in defrost of75
at any the
time. operating100 150
themore expansionthan valve bulb
one-third of on
the a system
horizontal run ofatsuction
defrosts one time. lineDuring
as closethe as reverse 20,000 5/8 7/8 7/8 7/8 7/8
Refrigerant
The hot gas unit Pipingcoolers canheader.
be usedUse in reverse cycleprovided
hot gas with defrost systems refrigeration
4,000 load be 1/2in defrost 1/2at any time. 1/2 1/2 1/2
possible to
cycle defrost, the suction
the reversing valve, the clamps
located in the compressor the valve toline,
discharge 25,000 7/8 7/8 7/8 7/8 1-1/8
using multiple
Installfasten
all refrigerant
the hotevaporators
bulbgas components
securely connected
so the insuction
there to
accordance one
is a tight condensing
with
line-to-lineapplicable unit.
contact Generally,
local and the
between not 5,000 1/2 1/2 1/2 1/2 1/2
diverts through line to the evaporator. R-404A, 7/8 R-407*,
1/2andR-448A/R-449A
30,000 7/8 R507 7/8 1-1/8 1-1/8
more
national than
bulb See
one-third
codes
andthe thepiping
in of
andsuction
view
the
accordance
line.system
in Suction
the
withdefrosts
Reverse
good
andCycle hotat gas
one
practice time.
connections
Defrost
Duringsystem
for proper
Piping arethe
diagram.
reverse
made The theHot gas line
onsuction 6,000sizes for R-22, 1/2 R404A 1/2 5/8 5/8
cycle defrost,
operation.
outside The the reversing
thermostatic
of thevalve unit. valve,
expansion located valve in the
must compressor
be the externallydischarge line, 35,000 7/8 7/8 1-1/8 1-1/8 1-1/8
linetype.
check System Capacity 7,000 Equivalent
1/2 1/2Discharge 5/8Length (Ft.) 5/8 5/8
diverts
equalized hot gas It can bedirects
through the
mounted the inside
suction hot
linegas tothe through
the thecompartment.
evaporator.
unit end drain pan loop Mountwhich 40,000 7/8 50 1-1/875 1-1/8 1-1/8 1-1/8
Suction
prevents lines should
condensate be sloped towards the compressor at the rate of one BTU/Hr 8,000 25 1/2 5/8 5/8 100 5/8 150 5/8
the expansion valve bulb on ainhorizontal the pan from run freezing.
of suctionThe linehot as gasclose exits
as the loop at 45,000 7/8 1-1/8 1-1/8 1-1/8 1-1/8
See (1) the
the
possible inch
pipingpan
to the perview ten in
loop
suction (10)
outlet
the feet
header. forUse
header
Reverse good theoil
and
Cycle return.
enters
Defrost
clamps the Vertical
evaporator
Piping
provided risersthe
diagram.
with of more
through The suction
valve than
the
to check four 4,0009,000 1/2 1/2 1/2 5/8 1/2 5/8 1/2 5/8 1/2 5/8
line (4)
check feet
valve should
valve assembly.
directsbe trapped
As
the the
hot at
hot
gas the
gas bottom
throughdefrosts the with
the
drain a P-trap.
coil,
pan heat
loop If
is a P-trap
removed
which is used,
preventsfrom the
the 5,000 50,000 1/2 7/81/2 1-1/81/2 1-1/81/2 1-1/81/2 1-1/8
fasten the bulb securely so there is a tight line-to-line contact between the 10,000 1/2 5/8 5/8 5/8 5/8
bulb expansion
condensate
and hot the gas valve
and
insuction
the pan bulb
eventually
from
line. should
freezing.
Suction be
it condenses
and installed
The hot hot gasinto
gasbetween
a liquid
exits
connections thetheand
loopunit
are exits and
atmadethe the
thepan coiltrap.
on at the
loop
the 6,000 60,000 1/2 5/8 1-1/81/2 1-1/81/2 1-1/85/8 1-3/85/8 1-3/8
12,000 5/8 5/8 7/8 7/8
distributor
outsideheader
outlet of theand side port.
unit.enters the The liquid then
evaporator through flowsthe through
check the valve check valve As
assembly. of the 7,000 70,000 1/2 5/8 1-1/81/2 1-1/85/8 1-3/85/8 1-3/85/8 1-3/8
Reverse Cycle System 14,000 5/8 7/8 7/8 7/8
the hot thermostatic
Suction gas
linesdefrosts
should the expansion
be coil, heat
sloped valve
towards bypass
is removed assembly,
from the hot
the compressor aroundgas rate
at the the of
and thermostatic
eventually
one 8,000 80,000 1/2 5/8 1-1/85/8 1-1/85/8 1-3/85/8 1-3/85/8 1-5/8
The hot gas unit coolers can be used in reverse cycle hot gas defrost systems 16,000 5/8 7/8 7/8 7/8
it condensesexpansion into valve,
a liquid andand into the
exits system
the coil
(1) inch per ten (10) feet for good oil return. Vertical risers of more than four liquid
at the line. The
distributor liquid side refrigerant
port. The then 9,000 90,000 1/2 5/8 1-1/85/8 1-3/85/8 1-3/85/8 1-5/85/8 1-5/8
liquidusing
(4) feetthenshould multiple
feedsflows other evaporators
evaporators
through
be trapped atthetheon connected
checkthe cooling
bottom valve to
withof one
acycle, condensing
evaporates,
If a P-trap isand
the thermostatic
P-trap. unit. Generally,
returns
expansion
used, the to thenot 18,000 7/8 7/8 7/8 7/8
10,000 100,000 1/2 1-1/85/8 1-3/85/8 1-3/85/8 1-5/85/8 1-5/8
more
expansion
valve bypass than
compressor
valve one-third
bulb
assembly, through
should of the
around their system
suction
be installed
the defrosts
lines. at expansion
between
thermostatic oneunit
the time. and During
the trap.
valve, the reverse
and into 20,000 5/8 7/8 7/8 7/8 7/8
12,000
Note: Use next larger5/8 hot gas 5/8 -200F.5/8 7/8 temperatures. 7/8
cycle defrost,
the system liquid line. the reversing
The liquidvalve, located
refrigerant thenin thefeeds compressor
other evaporators dischargeon line, 25,000 7/8line size for 7/8 and 7/8lower suction 7/8 1-1/8
Reverse
diverts Cycle
hot System
gas through theand suction linetotothe thecompressor
evaporator. through their 14,000 5/8 5/8 7/8 7/8 7/8
the cooling cycle, evaporates, returns 30,000 7/8 7/8 7/8 1-1/8 1-1/8
The hot gas 16,000 5/8 5/8 7/8 7/8 7/8
suction
Seelines.theunitpiping coolersviewcan in the be Reverse
used in reverse Cycle Defrost cycle hot Piping gas diagram.
defrost systems The suction 35,000 7/8 7/8 1-1/8 1-1/8 1-1/8
usinglinemultiple
checkevaporators
valve directsconnected the hot gastothrough one condensing the drainunit. pan loop Generally,whichnot 18,000 5/8 7/8 7/8 7/8 7/8
moreprevents
than one-third of theinsystem defrosts at one time. During the reverse 20,000 40,000 5/8 7/8 7/8 1-1/8 7/8 1-1/8 7/8 1-1/8 7/8 1-1/8
condensate the pan from freezing. The hot gas exits the loop at
REVERSE
cyclethedefrost,
REVERSE CYCLE
the reversing DEFROST
CYCLE valve, located
DEFROST PIPING
pan loop outlet header and enters the evaporator through the checkin the
PIPINGcompressor discharge line, THREE-PIPE
25,000 45,000 DEFROST
7/8 7/8 7/8PIPING 1-1/8 7/8 1-1/8 7/8 1-1/8 1-1/81-1/8
diverts
valve hotassembly.
gas through As thethe hot suction line to the
gas defrosts theevaporator.
coil, heat is removed from the 30,000 50,000 7/8 7/8 7/8 1-1/8 7/8 1-1/8 1-1/81-1/8 1-1/81-1/8
See the
hotpipinggas and view in the Reverse
eventually it condenses Cycle Defrostinto a liquid Piping anddiagram.
exits the The suction
coil at the 35,000 60,000 7/8 1-1/8 7/8 1-1/8 1-1/81-1/8 1-1/81-3/8 1-1/81-3/8
line check
distributor valve side directs port. theThe hotliquidgas through
then flows thethrough
drain pan theloop check which valve of the 40,000 70,000 7/8 1-1/8 1-1/81-1/8 1-1/81-3/8 1-1/81-3/8 1-1/81-3/8
prevents condensate
thermostatic in the pan
expansion valve from freezing.
bypass The hot
assembly, aroundgas exits the the loop at
thermostatic 80,000
45,000 7/8 1-1/8 1-1/81-1/8 1-1/81-3/8 1-1/81-3/8 1-1/81-5/8
the pan loop outlet
expansion valve, header
and into andthe enterssystem the liquid
evaporator line.EVAP. through
The liquidthe check then
refrigerant
valvefeeds
assembly. As the hot gas defrosts the coil, heat is
COIL
removed from the 50,000 90,000 7/8 1-1/8 1-1/81-3/8 1-1/81-3/8 EVAP. 1-1/8 1-5/8 1-1/81-5/8
COIL
other evaporators on the cooling cycle, evaporates, and returns to the 60,000 100,000 1-1/81-1/8 1-1/81-3/8 1-1/81-3/8 1-3/81-5/8 1-3/81-5/8
hot gas and eventually it condenses into a liquid and exits the coil at the
compressor through their suction lines. 70,000 1-1/8 1-1/8 1-3/8 1-3/8temperatures. 1-3/8
distributor side port. The liquid then flows through the check valve of the Note: Use next larger hot gas line size for -200F. and lower suction
thermostatic expansion valve bypass assembly, around the thermostatic 80,000 1-1/8 1-1/8 1-3/8 1-3/8 1-5/8
CHECK
expansion valve, TXVand into the system liquid line. The liquid refrigerant then
VALVE 90,000 TXV 1-1/8CHECK 1-3/8 1-3/8 1-5/8 1-5/8
feeds other evaporators on the cooling cycle, evaporates, and returns to the 100,000 1-1/8
VALVE
1-3/8 1-3/8 1-5/8 1-5/8
compressor through their suction CHECK VALVE
lines.
Note: Use next larger hot gas line size for -20 F. and lower suction temperatures.
0
REVERSE CYCLE DEFROST PIPING

PAN LOOP THREE-PIPE DEFROST PIPING
PAN LOOP
THREE-PIPE DEFROST PIPING
LIQUID
LINE HOT GAS LINE
THREE-PIPE DEFROSTHEAT
PIPING
HEAT – X
REVERSE CYCLE DEFROST PIPING –X
LIQUID LINE
SUCTION
EVAP. COIL SUCTION LINE
CHECK VALVE EVAP. COIL
LINE
9
EVAP. COIL EVAP. COIL
CHECK
TXV
VALVE TXV CHECK
VALVE
CHECK VALVE
CHECK
TXV PAN LOOP
VALVE TXV CHECK
VALVE PAN LOOP
CHECK VALVE LIQUID

LINE HOT GAS LINE
HEATPAN
– X LOOP
PAN LOOP LIQUID LINE
HEAT – X
SUCTION SUCTION LINE
CHECK VALVE
LIQUID LINE
LINE HOT GAS LINE
HEAT – X
HEAT – X
LIQUID LINE 9 9
SUCTION SUCTION LINE
CHECK VALVE
LINE
Unit Coolers
Table 3. Evaporator Troubleshooting Chart

SYMPTOMS POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
Fan(s) will not operate. 1. Main switch open. 1. Close switch.

2. Blown fuses. 2. Replace fuses. Check for short circuits or overload conditions.
3. Defective motor. 3. Replace motor.
4. Defective timer or defrost thermostat. 4. Replace defective component.
5. Unit in defrost cycle. 5. Wait for completion of cycle.
Table 3. Evaporator Troubleshooting
6. Coil does not get cold Chart
enough to reset thermostat. 6. Adjust fan delay setting of thermostat. See Defrost
Thermostat Section of this bulletin.
SYMPTOMS
Room temperature too high. 1. Room thermostat POSSIBLE CAUSES
set too high. POSSIBLE CORRECTIVE STEPS
1. Adjust thermostat.
2. Superheat too high. 2. Adjust thermal expansion valve.
Fan(s) will not operate. 1. System
3. Main switch
low onopen.
refrigerant. 1. Add
3. Closerefrigerant.
switch.
2. Coil
4. Blown fuses.
iced-up. 2.
4. Replace
Manuallyfuses. Check
defrost coil.for shortdefrost
Check circuitscontrols
or overload conditions.
for malfunction.
3. Unit
5. Defective
coolermotor.
located too close to doors. 3. Replace motor.
5. Relocate unit cooler or add strip curtain to door opening.
4. Heavy
6. Defective timer or defrost thermostat.
air infiltration. 4.
6. Replace defective
Seal unwanted component.
openings in room.
Ice accumulating on ceiling 1. Defrost duration is too long. 1. Adjust defrost termination thermostat.
6. Coil does not get cold enough to reset thermostat. 6. Adjust fan delay setting of thermostat. See Defrost
around evaporator and/or on 2. Fan delay not delaying fans after defrost period. 2. Defective defrost thermostat or not adjusted properly.
fan guards venturi or blades. 3. Defective defrost thermostat or timer. 3. Replace defective component.
Room temperature too high. 4. Room
1. Too many defrosts.set too high.
thermostat 4. Adjust
1. Reducethermostat.
number of defrosts.
Coil not clearing of frost during 2. Coil
1. Superheat too high.
temperature not getting above freezing point 2. Check
1. Adjust heater
thermal expansion valve.
operation.
defrost cycle. during defrost.on refrigerant.
3. System low 3. Add refrigerant.
4. Not
2. Coil enough
iced-up. defrost cycles per day. 4. Adjust
2. Manually defrost
timer for coil.
more Check defrost
defrost controls for malfunction.
cycles.
5. Defrost
3. Unit cooler
cyclelocated too close to doors.
too short. 5. Adjust
3. Relocate unit cooler
defrost or addor
thermostat strip curtain
timer to door
for longer opening.
cycle.
6. Defective
4. Heavy air infiltration.
timer or defrost thermostat. 6. Replace
4. Seal unwanted openings
defective component.in room.
Ice accumulating
Ice accumulating in
ondrain
ceiling
pan 1. Defective
1. Defrost duration
heater. is too long. 1. Replace
1. Adjust defrost
heater.termination thermostat.
around evaporator and/or on 2. Fan delay not
2. Unit not pitched delaying fans after defrost period.
properly. 2. Check anddefrost
2. Defective adjust thermostat
if necessary.or not adjusted properly.
fan guards venturi or blades. 3. Drain
3. Defective
line defrost
plugged. thermostat or timer. 3. Clean
drain line. component.
4. Defective
4. Too many drain
defrosts.
line heater. 4. Replace
4. Reduce number
heater. of defrosts.
Coil not clearing of frost during 5.
1. Defective timer ornot
Coil temperature thermostat.
getting above freezing point 5.
Check heater component.
operation.
defrost cycle.
Uneven coil frosting during
1. defrost.
Defective heater. 1. Replace heater.
2. Located
2. Not enough defrost
too close tocycles
door orper day.
opening. 2. Relocate
2. Adjust timer for more defrost cycles.
evaporator.
3. Defrost
3. Defrost termination
cycle too short.
set too low. 3. Adjust
3. Adjust defrost
defrost termination
thermostat or timer higher.
setting for longer cycle.
4. Incorrect
4. Defectiveor timer or defrost
missing thermostat.
distributor nozzle. 4. Add
or replace component.
nozzle with appropriately sized
Ice accumulating in drain pan 1. Defective heater. 1. orifice
Replace forheater.
conditions.
2. Unit not pitched properly. 2. Check and adjust if necessary.
3. Drain line plugged. 3. Clean drain line.
4. Defective drain line heater. 4. Replace heater.
Replacement Parts by 5. Defective timer or thermostat. 5. Replace defective component.
Uneven coil frosting Commercial
1. Defective heater.Refrigeration Parts 1. Replace heater.
2.of
InterLink is your link to a complete line Located too close
dependable and to door orcommercial
certified 2. Relocateand
opening. refrigeration parts, accessories evaporator.
innovative electronic controls for all Heatcraft
Refrigeration Products (HRP) brands3.- including
Defrost termination set Climate
Bohn, Larkin, 3. Adjust we
too low. Control and Chandler. At InterLink, defrost termination
provide setting higher.
our wholesalers with a comprehensive
4. Incorrect
selection of product solutions and innovative or missing distributor
technologies 4. Addproduct
nozzle.customer base. And every
for the installed or replace nozzle
is built with appropriately
to ensure the same highsized
performance
standards with which all HRP brands are built — backed by a dedicated team to serve every customer orifice
need,fordelivering
conditions. at the best lead times in the industry.
Replacement parts should be obtained from your local InterLink wholesaler. Replacement parts, which are covered under the terms of the warranty statement
on page 2 of this manual, will be reimbursed for total part cost only. The original invoice from the parts supplier must accompany all warranty claims for
Replacement
replacement Parts by Heatcraft Refrigeration Products reserves the right to adjust the compensation amount paid on any parts submitted
part reimbursement.
for warranty reimbursement when a parts supplier's original invoice is not provided with a claim. For more information, call 800-686-7278 or visit
www.interlinkparts.com. Commercial Refrigeration Parts
InterLink is your link to a complete line of dependable and certified commercial refrigeration parts, accessories and innovative electronic controls for all Heatcraft
ForProducts
Refrigeration more detailed information
(HRP) brands - includingon theLarkin,
Bohn, following
Climatetopics, please
Control visit http://heatcraftrpd.com/service/publibrary.asp
and Chandler. At InterLink, we provide our wholesalers with a comprehensive
selection of product solutionsfor and
ourinnovative
completetechnologies
Refrigeration Systems
for the installedInstallation and
customer base. Operation
And Manual
every product (H-IM-64L).
is built to ensure the same high performance
standards with which all HRP brands are built — backed by a dedicated team to serve every customer need, delivering at the best lead times in the industry.
Defrost Thermostat Refrigerant Charging Instructions
Replacement parts should be obtained fromValves
Expansion your & local InterLink wholesaler. Replacement
Nozzles parts,
System which—
Balancing areCompressor
covered under the terms of the warranty statement
Superheat
on page 2 of this manual, will be Refrigerant
reimbursed Oilsfor total part cost only. The original invoice
Generalfrom the parts
Sequence supplier must accompany all warranty claims for
and Operation
replacement part reimbursement.Recommended
Heatcraft Refrigeration Products reserves the right
Refrigerant Piping Practices
to adjust the compensation amount paid on any parts submitted
Troubleshooting Guides
Line Sizing Charts Preventive Maintenance Guidelines
www.interlinkparts.com.
Hot Gas Defrost Systems Typical Wiring Diagrams
For more detailed information
Evacuation andon the
Leak following topics, please visit http://heatcraftrpd.com/service/publibrary.asp
Detection
for our
Since product completeisRefrigeration
improvement Systems
a continuing effort, Installation
we reserve the right and Operation
to make changes Manual (H-IM-64L).
in specifications without notice.
Expansion Valves & Nozzles System Balancing — Compressor Superheat
Refrigerant Oils General Sequence and Operation
RecommendedThe name behind the brands you trust.™
Refrigerant Piping Practices Troubleshooting Guides
10
Unit Coolers
CO2 Unit Coolers

CO2 unit coolers function in much the same way as standard HFC unit
coolers with some exceptions. This section describes recommendations and
requirements unique to CO2 unit coolers.
1. Unit Cooler design pressure is marked on the data plate. CO2

refrigeration system must be designed to not exceed this design pressure.
2. Proper pressure relief means must be provided for the Unit Cooler
externally. Pressure relief valves provide safety measures during
circumstances such as power outages, natural disasters, or system
malfunction that may cause abnormal operation and high pressure in the
system. Relief valves must be installed in the system to protect the suction
and liquid sides. Please refer to project system documentation (not
supplied with the Unit Cooler) for guidance.
3. Proper piping methods must be followed to avoid trapping liquid in the

lines. Please refer to project system piping drawings (not supplied with
the Unit Cooler) for guidance.
4. Gauges designed for CO2 with proper pressure ratings must be used.
11
Unit Coolers
Electronic Thermostats
Electronic Thermostats are available as option packages (See Pricelist for Table 8. Standard parameter setup codes, descriptions,
details). They provide improved reliability and accuracy over traditional range of values, and default values (cont.)
electromechanical controls, faster response time to temperature changes
and more stable box temperature control. They come with a functionality
that can be enabled in the field to act as an air defrost time clock. This allows
for the elimination of the air defrost time clock on the Condensing Unit as
well as wiring between the Unit Cooler & Condensing Unit.
Electronic Thermostat Programming Steps

Basic Menu
Use the Basic menu to quickly edit the On and OFF temperature values, as
well as the Sensor Failure Mode (SF) and the Anti-Short Cycle Delay (ASd)
value.
See Parameter codes and modes of operation and Table 8 for more
information about parameter codes, usable parameter values, and default
values.
Table 8. Standard parameter setup codes, descriptions,

range of values, and default values
12
Unit Coolers
Electronic Thermostats (cont.)

Figure 9: Typical passive Defrost Cycle behavior
Figure 8: Navigating the Basic menu
Control behavior when manually starting or stopping a

Defrost Off-Cycle
The following behavior is enforced:
• Manually start a Defrost Cycle. The control returns to normal On/Off
operation after the defrost cycle time (dFt) is complete.
• Manually stop a Defrost Cycle. The defrost cycle time (dFt) is
terminated and the control is returned to normal On/Off operation.
Manually starting and stopping a Defrost Cycle (SdF)

In this task you manually Start/Stop a Defrost Cycle (SdF).
1. Select a Defrost Interval (dI) value of 0.
2. Select a dFt value between 1 minute and 99 minutes.
3. Select an SdF parameter value of 1 during normal On/Off operation to
start a defrost cycle.
- Or, change the SdF value to 0 during a defrost cycle and return to
normal On/Off operation. See Fig. 10 below.
Viewing and changing values in the Basic menu
In this task you access the Basic menu and view and change the Basic Figure 10: Manual Defrost only: behavior when dI is set to 0
parameter values.
1. On the Main screen, press MENU. The LCD displays OFF, which is the
first parameter code screen displayed in the Basic menu.
2. To scroll through all of the basic parameter codes and display the
preferred code, press Down or Up
3. With the preferred parameter code displayed, press MENU to display
the current parameter value for the code.
4. With the current parameter value displayed, press Down or Up to Control behavior when starting or stopping an
scroll through all of the parameter’s usable values and display the
automatically enabled Defrost Off-Cycle
preferred value.
5. With the preferred parameter value displayed, press MENU to save the
displayed value and go to the next parameter code. • At power up, the initial Defrost Interval (dI) does not initiate a Defrost
6. To exit the Basic menu and go to the Advanced menu, simultaneously Cycle Time (dFt).
press and hold Down and Up, for 5 seconds. • A defrost cycle occurs at the beginning of each subsequent defrost
interval.
Setting up a regular or timed Defrost Off-Cycle • You can start or stop a defrost cycle using the SdF parameter or binary
input (BIN).
• Starting a defrost cycle terminates the defrost interval (dI) and starts a
• At power up, the initial Defrost Interval (dI) does not have a Defrost
new defrost cycle.
Cycle (dFt).
• Stopping a defrost cycle terminates the dFt and continues the current
• Subsequent defrost intervals (dI) begin with the selected dFt value.
defrost interval (dI) until the start of the next regular dI and defrost
• All defrost intervals have the same length. To set up a regular or timed cycle.
defrost cycle:
1. Select a dI value between 2 hours and 24 hours. Starting or stopping a Defrost Cycle using the SdF
parameter
NOTE: A dI value of 0 indicates no defrost interval.
1. To start or stop a Defrost Cycle using the SdF parameter, choose from
the following options.
2. Select a dFt value between 1 minute and 99 minutes.
See Figure 9. - Select a Start/Stop Defrost Cycle (SdF) parameter value of 1.
- Or, change the SdF value to 0(zero) during a dFt to stop a defrost
cycle and return the control to normal On/Off operation.
See Figure 11.
13
Unit Coolers
Electronic Thermostats (cont.)

Starting or stopping a Defrost Cycle using the binary
input (BIN) 8.50
In this task, you start or stop a Defrost Cycle using the Binary Input (BIN).
1. Connect a momentary contact switch between BIN and COM on the
T3AIR DEFROST
terminal block.(1 PH) AIR DEFROST (1 PH)
ONE SPEED MOTORS 460V ONE SPEED MOTORS
Each time the momentary contact switch is pressed, the defrost
cycle starts or stops depending on whether the defrost cycle is
115V OR 230V 115V OR 230V 460V
running or not. See Figure 11.
Figure 11: Starting and stopping a dFT:

G behavior
T1 using
T2 SdF parameter
T3 K and momentary
G T1contact
T2 T3 K F1 F2
switch
BLUE
BLUE
BLACK
BLACK
RED
Source: A421 Series Electronic Temperature Controls with Off-Cycle

Defrost Installation Guide. Reproduced with permission from
FAN
Johnson Controls
FAN MOTORS
MOTORS
WIRING DETAIL (ELECTRONIC THERMOSTAT)

AT)
115V 208V - 230V
240V
120V
240V
LNO
120V
LNC
LNO
LNC
ROOM
LN
LC
LN
LC
ROOM
THERMOSTAT
THERMOSTAT
BLACK BLACK
BLUE BLUE
RED
RED
BLACK BLACK
LIQ. SOLENOID BLACK BLACK
LIQ. SOLENOID
T1 T2 T3 K T1 T2 T3 K
PRINTERS NOTE:
ONS)
1. PRINTED PART NO
8 9 10 11 12 13
- - - - - -
VOLTA GE/
FINS
DEFROST
FA N
DESIGN
2. PRINTED SIZE TO
REFRIG. P ER M OTOR
P H / HZ TYPE VINTA GE
INCH TYP E
3. LASER CAL V400 7
NOTES:
1. USE COPPER CONDUCTORS ONLY.
S 3 P H)
2. UNIT MUST BE GROUNDED. 4. BLACK LETTERING
3. REFER TO REFRIGERATION SYSTEM INSTALLATION MANUAL
FOR WIRING INSTRUCTIONS FOR SYSTEMS WITH MULTIPLE
EVAPORATORS.
Y ENCLOSED)
4. FACTORY - INSTALLED SOLENOID AND ROOM THERMOSTAT
SHLESS DC (TOTA LLY ENCLOSED) WIRED TO MATCH FAN MOTOR VOLTAGE EXCEPT FOR 460V
14
SHLESS DC (TOTA LLY ENCLOSED) 2-SP EED (WIRED FOR 230V).
g procedure 5. Once the cassette has been removed from the unit cooler, the cassette can
Figure 6. Bulb and Contact Location be stored on the unit by using the service clip feature. (Figure 10)
Figure
This 1. will
method Medium Profile
yield fairly and
accurate Large
results as Unit Coolers
long as the pressure drop
through the evaporator coil is low. 6. To reinstall cassette, reconnect plug and slide cassette back into place. Re-
secure the cassette by placing screws in place.
NOTE:
ge Discontinued Unit Coolers W = Total width
of evaporator
coil surface.
Slim Contour
Slim ContourExclusive
ExclusiveInformation
Information
The Slim Contour has several exclusive features that improve the serviceability.
Onehas
The Slim Contour evaporator
several exclusive features that improve the servicability .
Figure 7. Multiple Evaporators Figure 8. Figure 9. Figure 10.
Cassette Removal/Replacement Service
Cassette Removal Two
Clip Features
(Step 3) evaporators
Cassette Removal (Step 4) Cassette Removal (Step 5)
Cassette
Removal Removal/Replacement
Figureof2.modular cassettesUnit
Low Profile in theCoolers
Slim Contour improve access and the The Slim Contour features a service clip on all of its modular cassettes.
speed
Removalrequired to service
of modular the unit
cassettes in cooler.
the Slim Contour improve access and the TheService
service Clip
clip isFeature
exclusive to Slim Contour cassettes and is designed
speed required to service the unit cooler. to The
improve the serviceability
1. Turn off electrical feed to the unit. Slim Contour features a of the unit
service cooler.
clip on all ofThe service clip
its modular features
cassettes. The
two separate
service clip ishooks thattocan
exclusive Slimbe used to
Contour aide inand
cassettes common maintenance.
is designed to improve
1. Turn off electrical feed to the unit. NOTE:
2. Remove the fan guard (2 Screws). the serviceability of the unit cooler. The service clip features two separate
2. Remove the fan guard (2 Screws). H = Total height Thehooks that
service canthat
clip be is
used to aideonintop
featured common
of the maintenance.
cassettes motor can be used to
3. Remove screws from modular cassette and pull cassette forward, but do
of evaporator suspend the cassette while being removed to assist in removing the power
not fully screws
3. Remove removefrom
cassette. (Figure
modular 8)
cassette and pull cassette forward, but do
coil surface. connection of the cassette( Figure 11). The Slimcassettes
The service clip that is featured on top of the Contour motor can
cassette becan
also usedbeto
not fully remove cassette. (Figure 8) suspend the cassette while being removed to assist in removing the power
4. With the cassette slightly removed, reach behind the cassette and unplug suspended
connection from the cassette(Figure
of the drain pan using11.). the screw
The Slimmounts
Contour(Figure 12). also can be
cassette
wiredthe
4. With connection. This willremoved,
cassette slightly separate the cassette
reach behind from
theunit cooler.and
cassette (Figure 9)
unplug suspended from the drain pan using the screw mounts (Figure 12.)
wired connection. This will separate the cassette from unit cooler. (Figure 9)
5. Once the cassette has been removed from the unit cooler, the cassette Two evaporators
can be
5. Once the
One
stored onevaporator
cassette the
hasunit
been byremoved
using thefrom
service
the clip
unitfeature. (Figure
cooler, the 10) can
cassette
be stored on the unit by using the service clip feature. (Figure 10)
6. To reinstall cassette, reconnect plug and slide cassette back into place.
Re-secure
6. To reinstallthe cassette
cassette, by placing
reconnect plugscrews in place.
and slide cassette back into place. Re-
Figure
secure the3. Center
cassette Mount
by placing UnitinCoolers
screws place.

6
Figure 8. Figure 9. Figure 10.

Cassette Removal (Step 3) Cassette Removal (Step Recommended
4) Maximum
- Minimum Dimensions for
Cassette Removal (Step 5)
Center Mount Unit Cooler Installations.
E S M T
Service Clip Feature Max. Min. Max. Min. Max. Min. Max. Min.
The Slim Contour features a service clip on all25'
of its modular
2' cassettes.
20' The
3' 40' 3' 40' 6'
service clip is exclusive to Slim Contour cassettes and is designed to improve
the serviceability of the unit cooler. The service clip features two separate
Figure
hooks that3A.
canSlim Contour
be used Unit
to aide in Coolers
common maintenance.
Figure 3A. Slim Contour Unit Coolers
The service clip that is featured on top of the cassettes motor can be used to
suspend the cassette while being removed to assist in removing the power
connection of the cassette(Figure 11.). The Slim Contour cassette also can be A A
A pan using the screw mounts (Figure 12.) NS2NS NS2NS
NS2NS
suspended from the drain

Min A
NS2NS
B
NS
A
NS2NS
A
NS2NS
A
NS2NS
A 18"
B 36"
&.7+14<
&.7+14<
&.7+14<
51&3;.*< 51&3;.*<

15
Table 3. Evaporator Troubleshooting Chart
SYMPTOMS POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
Fan(s) will not operate. 1. Main switch open. 1. Close switch.

2. Blown fuses. 2. Replace fuses. Check for short circuits or overload conditions.
3. Defective motor. 3. Replace motor.
6. Coil does not get cold enough to reset thermostat. 6. Adjust fan delay setting of thermostat. See Defrost
Room temperature too high. 1. Room thermostat set too high. 1. Adjust thermostat.
2. Superheat too high. 2. Adjust thermal expansion valve.
3. System low on refrigerant. 3. Add refrigerant.
4. Coil iced-up. 4. Manually defrost coil. Check defrost controls for malfunction.
5. Unit cooler located too close to doors. 5. Relocate unit cooler or add strip curtain to door opening.
6. Heavy air infiltration. 6. Seal unwanted openings in room.
Ice accumulating on ceiling 1. Defrost duration is too long. 1. Adjust defrost termination thermostat.
around evaporator and/or on 2. Fan delay not delaying fans after defrost period. 2. Defective defrost thermostat or not adjusted properly.
fan guards venturi or blades. 3. Defective defrost thermostat or timer. 3. Replace defective component.
4. Too many defrosts. 4. Reduce number of defrosts.
Coil not clearing of frost during 1. Coil temperature not getting above freezing point 1. Check heater operation.
defrost cycle. during defrost.
2. Not enough defrost cycles per day. 2. Adjust timer for more defrost cycles.
3. Defrost cycle too short. 3. Adjust defrost thermostat or timer for longer cycle.
Ice accumulating in drain pan 1. Defective heater. 1. Replace heater.
2. Unit not pitched properly. 2. Check and adjust if necessary.
3. Drain line plugged. 3. Clean drain line.
4. Defective drain line heater. 4. Replace heater.
5. Defective timer or thermostat. 5. Replace defective component.
Uneven coil frosting 1. Defective heater. 1. Replace heater.
2. Located too close to door or opening. 2. Relocate evaporator.
3. Defrost termination set too low. 3. Adjust defrost termination setting higher.
4. Incorrect or missing distributor nozzle. 4. Add or replace nozzle with appropriately sized
orifice for conditions.
Replacement Parts by
Commercial Refrigeration Parts
InterLink is your link to a complete line of dependable and certified commercial refrigeration parts, accessories and innovative electronic controls for all Heatcraft
Refrigeration Products (HRP) brands - including Bohn, Larkin, Climate Control and Chandler. At InterLink, we provide our wholesalers with a comprehensive
selection of product solutions and innovative technologies for the installed customer base. And every product is built to ensure the same high performance
standards with which all HRP brands are built — backed by a dedicated team to serve every customer need, delivering at the best lead times in the industry.
Replacement parts should be obtained from your local InterLink wholesaler. Replacement parts, which are covered under the terms of the warranty statement
on page 2 of this manual, will be reimbursed for total part cost only. The original invoice from the parts supplier must accompany all warranty claims for
replacement part reimbursement. Heatcraft Refrigeration Products reserves the right to adjust the compensation amount paid on any parts submitted
www.interlinkparts.com.
For more detailed information on the following topics, please visit http://heatcraftrpd.com/service/publibrary.asp
for our complete Refrigeration Systems Installation and Operation Manual (H-IM-64L).
Expansion Valves & Nozzles System Balancing — Compressor Superheat
Refrigerant Oils General Sequence and Operation
Recommended Refrigerant Piping Practices Troubleshooting Guides
Evacuation and Leak Detection
Since product improvement is a continuing effort, we reserve the right to make changes in specifications without notice.
The name behind the brands you trust.™
CLIMATE
CONTROL Commercial Refrigeration Parts
H-IM-CU-0523
H-IM-UC-0812

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Installation and

H-IM-UC May 2023 Part No. 25008201

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Warranty Statement (f ) All equipment is installed in accordance with

© 2019 Heatcraft Refrigeration Products LLC

Figure 2. Low Profile Unit Coolers of evaporator 11/3 H 11/3 H

Max. Min. Min

40' 6'B NS2NS NS

A 18" Min. Max. Min. Max. Min.

Figure 3A. Slim Contour UnitACoolers B 36"

Figure 3A. Slim Contour Unit Coolers A 51&3;.*< 18" 51&3;.*<

Unit Coolers Figure 3. Spring Mount

Condensate Drain Lines

Figure 6. Bulb and Contact Location 6.5.ToOnce the cassette,

Figure 7. Multiple Evaporators Figure 8.

LARGE UNIT Figure 11. Figure 12.

Figure 11. Figure 12.

Table 4. Expansion Valve Selection 150# Head Pressure Valve

Table 5. Expansion Valve Selection 100# Head Pressure Valve

REVERSE CYCLE DEFROST PIPING

CHECK VALVE LIQUID

Table 3. Evaporator Troubleshooting Chart

Fan(s) will not operate. 1. Main switch open. 1. Close switch.

CO2 Unit Coolers

1. Unit Cooler design pressure is marked on the data plate. CO2

3. Proper piping methods must be followed to avoid trapping liquid in the

Electronic Thermostat Programming Steps

Table 8. Standard parameter setup codes, descriptions,

Electronic Thermostats (cont.)

Control behavior when manually starting or stopping a

Manually starting and stopping a Defrost Cycle (SdF)

Electronic Thermostats (cont.)

Figure 11: Starting and stopping a dFT:

Source: A421 Series Electronic Temperature Controls with Off-Cycle

WIRING DETAIL (ELECTRONIC THERMOSTAT)

Figure 11. Figure 12.

Figure 8. Figure 9. Figure 10.

suspended from the drain

Figure 11. Figure 12.

Fan(s) will not operate. 1. Main switch open. 1. Close switch.

The name behind the brands you trust.™

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40' 6'B NS2NS NS

Figure 3A. Slim Contour Unit Coolers A 51&3;.< 18" 51&3;.<