Cleveland Controls Model

Division of UniControl Inc.

AFS222
Air Pressure Sensing Switch with Adjustable Set Point Range

Application
The Model AFS-222 is a general pur-
pose proving switch designed for
HVAC and Energy Management ap-
plications. It may be used to sense
positive, negative, or differential air
pressure.

General Description &

Operation
The plated housing contains a dia-
phragm, a calibration spring and a
snap-acting SPDT switch.The sample
connections located on each side of
the diaphragm accept " OD metal- Dimensions in Inches
(Millimeters)
lic tubing via the integral compres-
sion ferrule and nut.
must be mounted with the diaphragm a minimum of 1.5 duct diameters
An enclosure cover guards in any vertical plane in order to ob- downstream from the air source. In-
against accidental contact with the tain the lowest specified operating set stall the sampling probe as close to
live switch terminal screws and the point. Avoid mounting with the the center of the airstream as possible.
set point adjusting screw. The enclo- sample line connections in the "up" Refer to Figure 2 to identify the high
sure cover will accept a " conduit position. Surface mount via the two pressure inlet (H) and the low pres-
3/16 " diameter holes in the integral sure inlet (L). Select one of the five
connection.
mounting bracket. The mounting application options listed below (on
holes are 3-7/8 " apart. page 2), and connect the sample lines
Mounting (see Figure 1) as recommended.
Select a mounting location which is Air Sampling Connection
free from vibration. The AFS-222
(see Figure 2)
(Figure 1) (Figure 2)
The AFS-222 is designed to accept
firm-wall sample lines of " OD tub-
ing by means of ferrule and nut com-
pression connections. For sample
lines of up to 10 feet, " OD tubing
is acceptable. For lines up to 20 feet,
use " ID tubing. For lines up to 60
feet, use " ID tubing. A " OD
adapter, suitable for slip-on flexible
tubing is available: order part num-
ber 18311.Locate the sampling probe
Distributed by:

Building Controls Connection Inc

755 Center Street, Unit 7 * Lewiston, NY 14092
Tel: (716) 754-2672 Fax: (716) 754-7384

Bulletin AFS222.05 1
(Figure 3) TWO POSITIVE SAMPLES: Con- Specifications
nect the higher positive sample to in-
let H. Connect the lower positive
Model AFS-222 Air Flow Switch
sample to inlet L.
Mounting Position: Mount with the
ONE POSITIVE AND ONE NEGA-
diaphragm in any vertical plane.
TIVE SAMPLE: Connect the posi-
Set Point Range: 0.05 0.02" w.c. to
tive sample to inlet H. Connect the
12.0"w.c.
negative sample to inlet L.
Field Adjustable Operate Range:
0.07"w.c. to 12.0" w.c.
Electrical Connections(see Field Adjustable Release Range:
Figure 3) 0.04"w.c. to 11.2" w.c.
Approximate Switching Differential:
(Figure 4) Before pressure is applied to the dia- Progressive, increasing from 0.02 0.01
phragm, the switch contacts will be "w.c. at minimum set point to approxi-
in the normally closed (NC) posi- mately 0.8 " w.c. at maximum set point.
tion.The snap switch has screw top Measured Media: Air, or combustion
terminals with cup washers. Wire by-products that will not degrade silicon.
alarm and control applications as Maximum Pressure: psi
shown in Figure 4. (0.03 bar)
Operating Temperature Range:
-40F to 180F (-40 to 82C)
Field Adjustment
Life: 100,000 cycles minimum at 1/2 psi
The adjustment range of an AFS-222 maximum pressure each cycle and at
Air Switch is 0.05 .02" w.c. to 12.0" maximum rated electrical load.
w.c.. To adjust the set point, t urn the Electrical Rating:
POSITIVE PRESSURE ONLY: adjusting screw counterclockwise un- 300 VA pilot duty at 115 to 277 VAC,
Connect the sample line to inlet H; til motion has stopped. Next, turn the 15 amps noninductive to 277 VAC,
inlet L remains open to the atmo- adjusting screw 4 complete turns in 60 Hz.
sphere. a clockwise direction to engage the Contact Arrangement: SPDT
spring. From this point, the next ten Electrical Connections: Screw-type
NEGATIVE PRESSURE ONLY: terminals with cup washers.
turns will be used for the actual cali-
Connect the sample line to inlet L; Conduit Opening: 7/8" diameter
bration. Each full turn represents
inlet H remains open to the atmo- opening accepts " conduit.
approximately 1.2" w.c.
sphere. Sample Line Connectors: Male,
Please note: To properly cali- externally threaded 7/16" 24 UNS 2A
TWO NEGATIVE SAMPLES:
brate an air switch, a digital manom- thread, complete with nuts and self-
Connect the higher negative sample
eter or other measuring device should aligning ferrules.
to inlet L. Connect the lower nega-
be used to confirm the actual set Sample Line Connections: Connec-
tive sample to inlet H.
point. tors will accept " OD rigid or semi-rigid
tubing.
Approval: UL, FM, CSA
Shipping Weight: 1.2 lbs.

Accessories
Location of Sample Lines for Typical Applications P/N 18311 Slip-on " OD Tubing Adapter,
suitable for slipping on flexible plastic
tubing. Sample line probes. Orifice plugs
(pulsation dampers).

Pressure Conversion Table

1" H2O = 0.0361 lbs./sq. in. or 0.0735 in. mercury
1" Hg. = 0.491 lbs./sq. in. or 13.6 in. water
1 psi = 27.7 in. water or 2.036 in. mercury

AFS-222 Sensing Switches are manufactured

by Cleveland Controls Div. of UniControl Inc.

Bulletin AFS222.05
 Cleveland Controls Model
Division of UniControl Inc.
AFS262
Air Pressure Sensing Switch with Adjustable Set Point Range

Application
The Model AFS-262 is a general pur-
pose proving switch designed for
HVAC and Energy Management ap-
plications. It may be used to sense
positive, negative, or differential air
pressure.

General Description &

Operation
The plated housing contains a dia-
phragm, a calibration spring and a
snap-acting SPDT switch.The sample
connections located on each side of
the diaphragm accept " OD metal- Dimensions in Inches
(Millimeters)
lic tubing via the integral compres-
sion ferrule and nut.
must be mounted with the diaphragm a minimum of 1.5 duct diameters
An enclosure cover guards in any vertical plane in order to ob- downstream from the air source. In-
against accidental contact with the tain the lowest specified operating set stall the sampling probe as close to
live switch terminal screws and the point. Avoid mounting with the the center of the airstream as possible.
set point adjusting screw. The enclo- sample line connections in the "up" Refer to Figure 2 to identify the high
sure cover will accept a " conduit position. Surface mount via the two pressure inlet (H) and the low pres-
3/16 " diameter holes in the integral sure inlet (L). Select one of the five
connection.
mounting bracket. The mounting application options listed below (on
holes are 3-7/8 " apart. page 2), and connect the sample lines
Mounting (see Figure 1) as recommended.
Select a mounting location which is Air Sampling Connection
free from vibration. The AFS-262
(see Figure 2)
(Figure 1) (Figure 2)
The AFS-262 is designed to accept
firm-wall sample lines of " OD tub-
ing by means of ferrule and nut com-
pression connections. For sample
lines of up to 10 feet, " OD tubing
is acceptable. For lines up to 20 feet,
use " ID tubing. For lines up to 60
feet, use " ID tubing. A " OD
adapter, suitable for slip-on flexible
tubing is available: order part num-
ber 18311.Locate the sampling probe
Distributed by:

Building Controls Connection Inc

755 Center Street Unit 7 * Lewiston, NY 14092
Tel: (716) 754-2672 Fax: (716) 754-7384

Bulletin AFS262.05 1
(Figure 3) TWO POSITIVE SAMPLES: Con- Specifications
nect the higher positive sample to in-
let H. Connect the lower positive
sample to inlet L. Model AFS-262 Air Flow Switch

ONE POSITIVE AND ONE NEGA- Mounting Position: Mount with the
TIVE SAMPLE: Connect the posi- diaphragm in any vertical plane.
tive sample to inlet H. Connect the Set Point Range: 0.05 0.02" w.c. to
negative sample to inlet L. 2.0"w.c.
Field Adjustable Operate Range:
0.07"w.c. to 2.0" w.c.
Electrical Connections(see Field Adjustable Release Range:
Figure 3) 0.04"w.c. to 1.9" w.c.
(Figure 4) Approximate Switching Differential:
Before pressure is applied to the dia- Progressive, increasing from 0.02 0.01
phragm, the switch contacts will be "w.c. at minimum set point to approxi-
in the normally closed (NC) posi- mately 0.1 " w.c. at maximum set point.
tion.The snap switch has screw top Measured Media: Air, or combustion
terminals with cup washers. Wire by-products that will not degrade
alarm and control applications as silicone.
shown in Figure 4. Maximum Pressure:
psi (0.03 bar)
Field Adjustment Operating Temperature Range:
-40F to 180F (-40 to 82C)
The adjustment range of an AFS-262 Life: 100,000 cycles minimum at 1/2 psi
Air Switch is 0.05 .02" w.c. to 2.0" maximum pressure each cycle and at
w.c.. To adjust the set point, t urn the maximum rated electrical load.
POSITIVE PRESSURE ONLY: adjusting screw counterclockwise un- Electrical Rating:
Connect the sample line to inlet H; til motion has stopped. Next, turn the 300 VA pilot duty at 115 to 277 VAC,
inlet L remains open to the atmo- adjusting screw 4 complete turns in 15 amps noninductive to 277 VAC,
sphere. a clockwise direction to engage the 60 Hz.
spring. From this point, the next ten Contact Arrangement: SPDT
NEGATIVE PRESSURE ONLY:
turns will be used for the actual cali- Electrical Connections: Screw-type
Connect the sample line to inlet L;
bration. Each full turn represents terminals with cup washers.
inlet H remains open to the atmo- Conduit Opening: 7/8" diameter
approximately 0.2" w.c.
sphere. opening accepts " conduit.
Please note: To properly cali- Sample Line Connectors: Male,
TWO NEGATIVE SAMPLES:
brate an air switch, a digital manom- externally threaded 7/16" 24 UNS 2A
Connect the higher negative sample
eter or other measuring device should thread, complete with nuts and self-
to inlet L. Connect the lower nega-
be used to confirm the actual set aligning ferrules.
tive sample to inlet H.
point. Sample Line Connections: Connec-
tors will accept " OD rigid or semi-rigid
tubing.
Approval: UL, FM, CSA, CE
Shipping Weight: 1.2 lbs.

Accessories
Location of Sample Lines for Typical Applications P/N 18311 Slip-on " OD Tubing Adapter,
suitable for slipping on flexible plastic
tubing. Sample line probes. Orifice plugs
(pulsation dampers).

Pressure Conversion Table

1" H2O = 0.0361 lbs./sq. in. or 0.0735 in. mercury
1" Hg. = 0.491 lbs./sq. in. or 13.6 in. water
1 psi = 27.7 in. water or 2.036 in. mercury

AFS-262 Sensing Switches are manufactured

by Cleveland Controls Div. of UniControl Inc.

Bulletin AFS262.05 2
 Cleveland Controls Model
Division of UniControl Inc.
AFS460
ADJUSTABLE SET POINT AIR PRESSURE SENSING SWITCH WITH MANUAL RESET
APPLICATION
The Model AFS-460 is a general purpose
proving switch designed to require
manual operator reset following actuation.
It can be used to sense positive, nega-
tive, or differential air pressure in HVAC
and Energy Management applications
which require operator interface.
General Description & Operation
The plated housing contains a diaphragm,
a calibration spring and a snap-acting
SPSTNC switch with manual reset but-
ton.
The sample connections located on each
side of the diaphragm accept 0.25" OD
metallic tubing via the integral compres-
sion ferrule and nut.
An enclosure cover protects the operator
from accidental contact with the live
switch terminal screws and the set point
adjusting screw. The enclosure cover ac-
cepts a 0.5" conduit connection.
AIR SAMPLING CONNECTION
MOUNTING (SEE FIGURE 1)
(SEE FIGURE 2)
Select a mounting location which is free The AFS-460 is designed to accept firm- POSITIVE PRESSURE ONLY: Connect
from vibration. The AFS-460 must be wall sample lines of " OD tubing by the sample line to inlet H; inlet L remains
mounted with the diaphragm in any verti- means of ferrule and nut compression open to the atmosphere.
cal plane in order to obtain the lowest connections. An optional " adapter, suit- NEGATIVE PRESSURE ONLY: Connect
specified operating set point. Avoid able for slip-on flexible tubing is available: the sample line to inlet L; inlet H remains
mounting with the sample line connec- order part number 18311. For sample open to the atmosphere.
tions in the "up" position. Surface mount lines of up to 10 feet, " OD tubing is ac-
TWO NEGATIVE SAMPLES: Connect
via the two 3/16" diameter holes in the ceptable. For lines up to 20 feet, use "
the higher negative sample to inlet L. Con-
integral mounting bracket. The mounting ID tubing.
nect the lower negative sample to inlet
holes are 37/8" apart. For lines up to 60 feet, use " ID tubing. H.
(Figure 1) Locate the sampling probe a minimum
TWO POSITIVE SAMPLES: Connect the
of 1.5 duct diameters downstream from
higher positive sample to inlet H. Connect
the air source. Install the sampling probe
the lower positive sample to inlet L.
as close to the center of the airstream as
possible. Refer to Figure 2 to identify the ONE POSITIVE AND ONE NEGATIVE
high pressure inlet (H) and the low pres- SAMPLE: Connect the positive sample
sure inlet (L). Select one of the five appli- to inlet H. Connect the negative sample
cation options listed on page 2, and con- to inlet L.
nect the sample lines as recommended.

Are you
Cleveland Controls reading a FAX or a
COPY of this bulletin?
DIVISION OF UNICONTROL INC. Tel: 216-398-0330 DOWNLOAD the full-
1111 Brookpark Rd color PDF version of this
Fax: 216-398-8558 and other literature at
Cleveland OH 44109 our website!
Email:saleshvac@unicontrolinc.com
Web page: http://www.clevelandcontrols.com
Bulletin AFS460.06
(Figure 2)
ELECTRICAL SPECIFICATIONS
CONNECTIONS
MODEL AFS-460 AIR
(SEE FIGURE 3) PRESSURE SENSING
Before pressure is applied to the dia-
SWITCH WITH MANUAL
phragm, the switch contacts will be in the RESET FEATURE
normally closed (NC) position.
Mounting Position (in order to meet
(Figure 3) The snap switch has screw top terminals
lowest operating specifications): Mount
with cup washers. Wire alarm and con-
trol applications as shown in Figure 4. with the diaphragm in any vertical plane.
Set Point Range:
FIELD ADJUSTMENT 0.40 0.06"w.c. to 12.0"w.c.
Field Adjustable Operate Range:
The adjustment range of an AFS-460 0.46"w.c. to 12.0" w.c.
Air Switch is 0.4" 0.02" w.c. to 12.0" Field Adjustable Release Range:
w.c. To adjust the set point, turn the ad-
0.46"w.c. to 11.2" w.c.
justing screw counterclockwise until mo-
tion has stopped. Next, turn the adjust- Approximate Switch Differential:
ing screw four complete turns in a clock- Progressive, increasing from approxi-
wise direction to engage the spring. From mately
this point, the next ten turns will be used 0.06 0.01"w.c. at minimum set point, to
(Figure 4) for the actual calibration. Each full turn approximately 0.8"w.c. at maximum set
represents approximately 1.16" w.c. point.
Please note: To properly calibrate an Measured Media: Air, or combustion
air switch, a digital manometer or other by-products that will not degrade
measuring device should be used to con- silicone.
firm the actual set point. Maximum Pressure: psi (0.03 bar)
Life: Exceeds UL-recognized mechani-
cal endurance test of 6,000 cycles
minimum at 0.5 psi maximum pressure
each cycle and at maximum electrical
load.
Electrical Rating: @ 60 Hz.
15 amp 125, 250, or 277 VAC
hp 125 V AC, Hp 250 VAC,
amp 125 V DC,
amp 250 V DC .
Contact Arrangement:
SPSTNC (manual reset).
Electrical Connections:
Screw top terminals with cup washers.
Conduit Opening: 7/8" diameter
opening accepts " conduit.
Sample Line Connectors: Male,
externally threaded 7/16" 24 UNS 2A
thread, complete with nuts and self-
aligning ferrules.
Sample Line Connections: Connec-
tors will accept " OD rigid or semi-rigid
tubing.
Approval and Recognition:
UL, CSA, CE.
Shipping Weight:
1.2 lbs.
Accessories:
P/N 18311 Slip-on " OD Tubing
Adapter, suitable for slipping on flexible
plastic tubing.
Sample line probes.
Orifice plugs (pulsation dampers).
Nominal Dimensions in Inches (Millimeters)
 Cleveland Controls Model
Division of UniControl Inc. AFS-460-DSS
ADJUSTABLE SET POINT AIR PRESSURE SENSING SWITCH WITH DUAL MANUAL RESET

APPLICATION
The Model AFS-460DSS is a general
purpose airflow proving switch designed
for 120 VAC HVAC and Energy Manage-
ment applications where dual manual re-
set switches with SPST contacts are
needed. It may be used to sense posi-
tive, negative, or differential air pressure.

GENERAL DESCRIPTION &

OPERATION
The plated housing contains a diaphragm,
a calibration spring, and 2 snap-acting
switches with a single manual reset but-
ton.
The sample connections located on each
side of the diaphragm accept .25" (6.35
mm) OD tubing via the integral compres-
sion ferrule and nut.
An enclosure cover guards against acci-
dental contact with the live switch termi-
nal screws and the set point adjusting
screw. The enclosure cover accepts two mounting with the sample line connec- probe as close to the center of the air-
0.5" (12.7 mm) conduit connections. The tions in the "up" position. Surface mount stream as possible. Refer to Figure 2 to
manual reset button is located on the top via the two 3/16" (4.75 mm) diameter identify the high pressure inlet (H), and
surface of the enclosure cover. holes in the integral mounting bracket. the low pressure inlet (L). Select one of
The mounting holes are 3-7/8" (98.4 mm) the five application options listed below,
MOUNTING (SEE FIGURE 1) apart. and connect the sample lines as recom-
mended.POSITIVE PRESSURE ONLY:
Select a mounting location which is free AIR SAMPLING Connect the sample line to inlet H; inlet L
from vibration. The AFS-460DSS must remains open to the atmosphere.
be mounted with the diaphragm in any
CONNECTION
(SEE FIGURE 2) NEGATIVE PRESSURE ONLY: Connect
vertical plane in order to obtain the low-
the sample line to inlet L; inlet H remains
est specified operating set point. Avoid
The AFS-460DSS is designed to accept open to the atmosphere.
(Figure 1) firm-wall sample lines of " (6.35 mm) OD TWO NEGATIVE SAMPLES: Connect
tubing by means of ferrule and nut com- the higher negative sample to inlet L. Con-
pression connections. An optional " nect the lower negative sample to inlet
(6.35 mm) adapter, suitable for slip-on H.
flexible tubing is available. For sample
TWO POSITIVE SAMPLES: Connect the
lines of up to 10 feet (3.05 metres), "
higher positive sample to inlet H. Connect
(6.35 mm) OD tubing is acceptable. For
the lower positive sample to inlet L.
lines up to 20 feet (6.1 metres), use "
(6.35 mm) ID tubing. For lines up to 60 ONE POSITIVE AND ONE NEGATIVE
feet (18.3 metres), use " (12.7 mm) ID SAMPLE: Connect the positive sample
tubing. Locate the sampling probe a mini- to inlet H. Connect the negative sample
mum of 1.5 duct diameters downstream to inlet L.
from the air source. Install the sampling
Are you
Cleveland Controls reading a FAX or a
COPY of this bulletin?
DIVISION OF UNICONTROL INC. Tel: 216-398-0330 DOWNLOAD the full-
1111 Brookpark Rd color PDF version of this
Fax: 216-398-8558 and other literature at
Cleveland OH 44109 our website!
Email:saleshvac@unicontrolinc.com
Web page: http://www.clevelandcontrols.com
Bulletin AFS460DSS.03
ELECTRICAL CONNECTIONS SPECIFICATIONS
(Figure 2)
(SEE FIG. 3)
Before pressure is applied to the dia- MODEL AFS-460-DSS
phragm, the snap switch contacts will be AIR PRESSURE SENSING SWITCH
in the normally closed (NC) position as WITH MANUAL RESET & DUAL
shown in Fig. 3.
SPST-NC CONTACT ARRANGEMENT
The snap switches have screw top ter-
minals with cup washers. Wire alarm and Mounting Position (in order to meet lowest
control applications as shown in Fig. 4. operating specifications): Mount with the
diaphragm in any vertical plane.
FIELD ADJUSTMENT: Set Point Range:
LEAD & LAG SNAP SWITCHES 1.25 0.06"w.c. to 12.0"w.c. (31.8mm
(Figure 3)
1.52mm w.c. to 305 mm w.c.)
(SEE FIG. 4)
Field Adjustable Operate Range:
The AFS-460-DSS Manual Reset Air
1.31"w.c. to 12.0" w.c.
Switch has a lead snap switch adjust-
Field Adjustable Release Range:
ment of 1.25" w.c. to 12.0" w.c. (31.8
1.31"w.c. to 11.2" w.c.
mm w.c. to 305 mm w.c.) The set point
Approximate Switch Differential: Progres-
adjusting screw is used to adjust the set
sive, increasing from approximately 0.06
point of the lead snap switch (Switch A,
0.01"w.c. at minimum set point, to approxi-
in Fig. 4). The lag snap switch (Switch
mately 0.8"w.c. at maximum set point.
B, in Fig. 4) operates after the lead snap
Measured Media: Air, or combustion by-
switch at progressively increasing set
products that will not degrade silicone.
point increments as indicated in Table (Figure 4)
Maximum Pressure: psi (0.03 bar;
1, below. Note: if simultaneous opera-
3.45 kPa)
tion of Switch A and Switch B is required,
Life: Exceeds UL-recognized mechanical
use Model AFS-460-136 or AFS-460-
endurance test of 6,000 cycles minimum at
137.
0.5 psi (0.03 bar, 3.45 kPa) maximum
To adjust the set point of Switch A: pressure each cycle and at maximum
Turn the adjusting screw counterclock- electrical load.
wise until motion has stopped. Next, turn Electrical Rating: @ 60 Hz.
the adjusting screw four complete turns 15 amp 125, 250, or 277 v AC
in a clockwise direction to engage the hp 125 v AC, Hp 250 VAC,
spring. From this point, the next ten turns amp 125 v DC, amp 250 v DC.
will be used for the actual calibration. 0.5 VA @ 24 v AC, 50/60 Hz.
Each full turn represents approxi- Contact Arrangement:
mately 1.0" w.c. (25.4 mm w.c.). Please 2 SPSTNC (manual reset).
note: To properly calibrate an air switch, Electrical Connections:
a digital manometer or other measuring Screw top terminals with cup washers.
device should be used to confirm the Conduit Opening: 7/8" diameter opening
actual set point. accepts " conduit.
Sample Line Connectors: Male, externally
threaded 7/16" 24 UNS 2A thread, complete
Nominal Dimensions in Inches (Millimeters) with nuts and self-aligning ferrules.
Sample Line Connections: Connectors will
accept " (6.35mm) OD rigid or semi-rigid
tubing.
Approval and Recognition:
UL & CSA approved; CE pending.
Shipping Weight: 1.2 lbs.
TABLE 1
Lead Switch A Lag Switch B
Set Point Set Point
1.25" - 3.00" w.c. up to 5% afte r
( 31.8 - 76.2 mm w.c.) Switch A
3.00" - 6.00" w.c. up to 10% afte r
(76.2 - 152.4 mm w.c.) Switch A
6.00" - 9.00" w.c. up to 15% afte r
(152.4 - 229 mm w.c.) Switch A

9.00 - 12.00" w.c. up to 35% afte r

(229 - 305 mm w.c.) Switch A
 Cleveland Controls Sensing
Division of UniControl Inc.
FOR AIR PRESSURE SENSING SWITCHES
Probes

Static Pressure (Aspiration) Probes Total Pressure (Impact) Probes

Dimension B

Part Number

Dimension B

Part Number
Dimension A

Dimension B

Part Number

Dimension B

Part Number
Dimension A
Barbed End
Smooth OD

Barbed End
1.5 1.0 21397 1.75 21397-112 1.5 Smooth OD
1.0 21401 1.75 21401-112
2.0 .5 21116 1.25 21116-112 2.0 .5 21120 1.25 21120-112
3.5 1.0 21398 1.75 21398-112 3.5 1.0 21402 1.75 21402-112
4.0 .5 21117 1.25 21117-112 4.0 .5 21121 1.25 21121-112

5.5 1.0 21399 1.75 21399-112 5.5 1.0 21403 1.75 21403-112

6.0 .5 21118 1.25 21118-112 6.0 .5 21122 1.25 21122-112

7.5 1.0 21400 1.75 21400-112 7.5 1.0 21404 1.75 21404-112
8.0 .5 21123 1.25 21123-112
8.0 .5 21119 1.25 21119-112
10.0 .5 28527 1.25 28527-112
12.0 .5 28528 1.25 28528-112

Cleveland Controls Are

DIVISION OF UNICONTROL INC. you reading
a FAX or a COPY
of this bulletin?
DOWNLOAD the full-
color PDF version
of this and other
literature at our
website!
Bulletin AFS05.04
RECOMMENDED PROBE LOCATIONS: TYPICAL APPLICATIONS (SEE FIGS. 1-6):

1. Position 5 to 8 diameters downstream from elbows, ob- 1. Positive static pressure increases as the lter gets dirty.
structions, or signicant change in duct area. 2. Differential across lter changes as lter gets dirty.
2. Insert probe into duct perdendicular to airstream so that: 3. Flow is reduced as lter gets dirty.
Aspiration (static) probe tip opens parallel with airstream. 4. Fan operation or true air ow with little or no static pressure.
Impact (total pressure) probe tip opens directly into the airstream. 5. Negative pressure increases as the lter gets dirty.
6. Fan operation and true air ow: varying amounts of static
pressure. Probes must be perpendicular to air ow.