BULLETIN 309.

2
April, 2001
Replaces 309.1 (9/98)

NEW WK SERIES
LOW AIR FLOW
UNIT COOLERS
Air Defrost +35 °F
Electric Defrost +24 °F — +34 °F
Hot Gas Defrost +24 °F — +34 °F

QUALITY IS FACTORY INSTALLED!

Enhanced tubing for more efficient operation.

Solenoid wiring harness factory installed for easy
installation.

Improved motor rail design for added strength and
durability.

Wire fan guards with PVC coating for durability.

Fan panel hangs from unit for easy servicing and
installation. Simple for one person to install and service!

Efficient terminal board design simplifies wiring between
the evaporator and condensing unit.

Sweat connections to reduce potential for leaks.
Bohn Low Air Flow Unit Coolers

WK Series
The WK Series is ideal for floral storage,
fresh fruit and vegetables, dough retarding,
fresh meat storage and preparations, and
many other applications of 24°F. and above.
The low air flow and quiet fans are ideal for
work room applications. The generous coil
surface combined with close T.D. system
balance provides high humidity
characteristics to minimize product shrinkage
and drying. WK Series units are available in Bohn Model WKE 1-fan unit
air, electric and hot gas defrost.

Features
• Low height of the WK series makes it ideal for low ceiling coolers. Larger models are only 15 inches tall to allow for
maximum head room and more product storage.
• The WK series has a heavy gauge, attractive grained aluminum housing with stainless steel fasteners.
• Coils are dehydrated and sealed at the factory.
• WKE electric defrost models incorporate high quality tubular heaters and a defrost termination control factory set and
wired.
• Unit designed to be mounted flush against the ceiling or suspended on rods.
• Access panels on each end make expansion valve installation and electrical hookup easy.
• Motors are life lubricated and thermal overload protected.
• Fan panel is lightweight and can easily be lowered if internal inspection is required.
• A double drain pan eliminates drain pan sweating.
• Expansion valve mounts inside the cabinet.
• All WK Series units are UL listed for U.S.A. and Canada and meets NSF standards.

Options
• PSC motors for 50 or 60 Hertz operation.
• Other options available. Contact your Bohn sales representative.

Nomenclature

WK E 100 B C
WK = Bohn Low Air Vintage
Flow Unit Cooler
Voltage
Defrost Designation A = 115/1/60
E = Electric B = 208-230/1/60
G = Hot Gas
Capacity BTU x 100

© Heatcraft Inc. 2001

2
 Bohn Low Air Flow Unit Coolers

Diagram 1. Dimensions for all WK Series Units.

12 cm
12 cm (1 cm) 73 cm
3 cm 3 cm
1 cm 1 cm

3 cm

2 cm (2 cm Dia.) 68 cm
2 cm

Table 1. Dimensional Data for all WK Series Units.

Model Numbers Connections (In.)
by Defrost Types Dimensions (Inches/cm) Liquid Suction
Air Electric Hot Gas A B C D E F G L OD OD
WK 050 WKE 050 —— 6 7/8 8 7/8 4 1/16 —- 4 5/8 3 1/4 1 5/8 53 1/2 1/2 7/8
17 23 10 12 8 4 136
WK 075 WKE 075 —— 6 7/8 8 7/8 4 1/16 —- 4 5/8 3 1/4 1 5/8 75 1/2 1/2 7/8
17 23 10 12 8 4 192
WK 100 WKE 100 WKG 100 9 3/8 11 3/8 6 9/16 —- 7 1/8 3 1/4 1 5/8 75 1/2 1/2 7/8
24 29 17 18 8 4 192
WK 130 WKE 130 WKG 130 13 1/8 15 1/8 10 1/8 —- 8 1/2 2 11/16 1 1/8 75 1/2 1 1/8 1 1/8
33 38 26 22 7 3 192
WK 155 WKE 155 WKG 155 13 1/8 15 1/8 10 1/8 —- 8 1/2 2 11/16 1 1/8 75 1/2 1 1/8 1 1/8
33 38 26 22 7 3 192
WK 180 WKE 180 WKG 180 13 1/8 15 1/8 10 1/8 —- 8 1/2 2 11/16 1 1/8 75 1/2 1 1/8 1 1/8
33 38 26 22 7 3 192
WK 210 WKE 210 WKG 210 13 1/8 15 1/8 10 1/8 44 8 1/2 2 11/16 1 1/8 97 1/2 1 1/8 1 1/8
33 38 26 112 22 7 3 248
WK 270 WKE 270 WKG 270 13 1/8 15 1/8 10 1/8 44 8 1/2 2 11/16 1 1/8 97 1/2 1 3/8 1 3/8
33 38 26 112 22 7 3 248
WK 340 WKE 340 WKG 340 13 1/8 15 1/8 10 1/8 55 8 1/2 2 11/16 1 1/8 119 1/2 1 3/8 1 3/8
33 38 26 140 22 7 3 304

3
Bohn Low Air Flow Unit Coolers

AIR DEFROST
PERFORMANCE / ELECTRICAL DATA

Table 2. 60 Hz. Performance/Electrical Data for WK Air Defrost Units.

Capacities BTUH / kcal Fan Data Motor Data Approx.
50-55° F. DB Shaded Pole (Std) PSC (Opt.) Net
Model 10° F TD 15° F TD 55% RH 20° TD 115/1/60 230/1/60 115/1/60 230/1/60 Weight
No. 6° C TD 8° C TD Total Sensible No. CFM/m3h Amps Amps Amps Amps (Lbs / kg)
WK 050 5000 7500 10000 8500 1 725 2.1 1.1 .9 .45 70
1260 1890 2520 2142 1233 32
WK 075 7500 11250 15000 12750 1 730 2.1 1.1 .9 .45 103
1890 2835 3780 3213 1241 47
WK 100 10000 15000 20000 17000 2 1450 4.2 2.2 1.8 .9 106
2520 3780 5040 4284 2465 48
WK 130 13000 19500 26000 22100 2 1470 4.2 2.2 1.8 .9 145
3276 4914 6552 5569 2499 66
WK 155 15500 23250 31000 26350 2 1460 4.2 2.2 1.8 .9 149
3906 5859 7812 6640 2482 68
WK 180 18000 27000 36000 30600 3 2130 6.3 3.3 2.7 1.35 160
4536 6804 9072 7711 3621 73
WK 210 21000 31500 42000 35700 4 2840 8.4 4.4 3.6 1.8 193
5292 7938 10584 8996 4828 88
WK 270 27000 40500 54000 45900 4 2800 8.4 4.4 3.6 1.8 200
6804 10206 13608 11567 4760 91
WK 340 34000 51000 68000 57800 5 3500 10.5 5.5 4.5 2.25 242
8568 12852 17136 14566 5950 110
All units have 1/4” OD external equalizer and 3/4” F.P.T. drain connection.

Table 3. 50 Hz. Performance/Electrical Data for WK Air Defrost Units.

Capacities BTUH / kcal Fan Data Motor Data Approx.
10-13° C. DB PSC Net
Model 10° F TD 15° F TD 55% RH 20° TD 110/1/50 220/1/50 Weight
No. 6° C TD 8° C TD Total Sensible No. CFM/m3h Amps Amps (Lbs / kg)
WK 050 4800 7100 9500 8100 1 660 .9 .45 70
1210 1790 2390 2040 1122 32
WK 075 7100 10700 14300 12100 1 660 .9 .45 103
1790 2700 3600 3050 1122 47
WK 100 9500 14300 19000 16200 2 1310 1.8 .9 106
2390 3600 4790 4080 2227 48
WK 130 12400 18500 24700 21000 2 1330 1.8 .9 145
3120 4660 6220 5290 2261 66
WK 155 14700 22100 29500 25000 2 1320 1.8 .9 149
3700 5570 7430 6300 2244 68
WK 180 17100 25700 34200 29100 3 1920 2.7 1.35 160
4310 6480 8620 7330 3264 73
WK 210 20000 29900 39900 33900 4 2560 3.6 1.8 193
5040 7530 10050 8540 4352 88
WK 270 25700 38500 51300 43600 4 2530 3.6 1.8 200
6480 9700 12930 10990 4301 91
WK 340 32300 48500 64600 54900 5 3160 4.5 2.25 242
8140 12220 16280 13830 5372 110
All units have 1/4” OD external equalizer and 3/4” F.P.T. drain connection.

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 Bohn Low Air Flow Unit Coolers

ELECTRIC DEFROST
PERFORMANCE / ELECTRICAL DATA

Table 4. 60 Hz. Performance/Electrical Data for WKE Electric Defrost Units.

Capacities Fan Data Motor Data Heaters Approx.
BTUH / kcal Shaded Pole (Std) PSC Net
Model 10° F TD 15° F TD 230/1/60 230/1/60 Total 230/1/60 Weight
No. 6° C TD 8° C TD Qty CFM/m3h Amps Amps Watts Amps (Lbs/kg)
WKE 050 5000 7500 1 725 1.1 .45 2000 8.7 75
1260 1890 1233 34
WKE 075 7500 11250 1 730 1.1 .45 2400 10.5 108
1890 2835 1241 49
WKE 100 10000 15000 2 1450 2.2 .9 2800 12.2 111
2520 3780 2465 50
WKE 130 13000 19500 2 1470 2.2 .9 4000 17.4 150
3276 4914 2499 68
WKE 155 15500 23250 2 1460 2.2 .9 4000 17.4 154
3906 5859 2482 70
WKE 180 18000 27000 3 2130 3.3 1.35 4000 17.4 157
4536 6804 3621 71
WKE 210 21000 31500 4 2840 4.4 1.8 5200 22.6 203
5292 7938 4828 92
WKE 270 27000 40500 4 2800 4.4 1.8 5200 22.6 208
6804 10206 4760 94
WKE 340 34000 51000 5 3500 5.5 2.25 7000 30.4 250
8568 12852 5950 113
All units have 1/4” OD external equalizer and 3/4” F.P.T. drain connection.

Table 5. 50 Hz. Performance/Electrical Data for WKE Electric Defrost Units.

Capacities Fan Data Motor Data Heaters Approx.
BTUH / kcal PSC Net
Model 10° F TD 15° F TD 220/1/50 Total 220/1/50 Weight
No. 6° C TD 8° C TD Qty CFM/m3h Amps Watts Amps (Lbs / kg)
WKE 050 4800 7100 1 660 .45 1830 8.3 75
1210 1790 1122 34
WKE 075 7100 10700 1 660 .45 2200 10.0 108
1790 2700 1122 49
WKE 100 9500 14300 2 1310 .9 2560 11.6 111
2390 3600 2227 50
WKE 130 12400 18500 2 1330 .9 3660 16.6 150
3120 4660 2261 68
WKE 155 14700 22100 2 1320 .9 3660 16.6 154
3700 5570 2244 70
WKE 180 17100 25700 3 1920 1.35 3660 16.6 157
4310 6480 3264 71
WKE 210 20000 29900 4 2560 1.8 4760 21.6 203
5040 7530 4352 92
WKE 270 25700 38500 4 2530 1.8 4760 21.6 208
6480 9700 4301 94
WKE 340 32300 48500 5 3160 2.25 6400 29.1 250
8140 12220 5372 113
All units have 1/4” OD external equalizer and 3/4” F.P.T. drain connection.

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Bohn Low Air Flow Unit Coolers

HOT GAS DEFROST

PERFORMANCE / ELECTRICAL DATA

Table 6. 60 Hz. Performance/Electrical Data for WKG Hot Gas Defrost Units.
Capacities Fan Data Motor Data Drain Pan Heaters Approx.
BTUH / kcal Shaded Pole (Std) PSC (Optional) Net
Model 10° F TD 15° F TD 115/1/60 230/1/60 115/1/60 230/1/60 Total 230/1/60 115/1/60 Weight
No. 6° C TD 8° C TD Qty CFM/m3h Amps Amps Amps Amps Watts Amps Amps (Lbs/kg)
WKG 100 10000 2520 15000 3780 2 14502465 4.2 2.2 1.8 .9 350 1.5 3 131
59
WKG 130 13000 19500 1470 170
3276 4914 2 2499 4.2 2.2 1.8 .9 500 2.2 4.4 77
WKG 155 15500 23250 1460 174
3906 5859 2 2482 4.2 2.2 1.8 .9 500 2.2 4.4 79
WKG 180 18000 27000 2130 185
4536 6804 3 3621 6.3 3.3 2.7 1.35 500 2.2 4.4 84
WKG 210 21000 31500 2840 223
5292 7938 4 4828 8.4 4.4 3.6 1.8 650 2.8 5.7 101
WKG 270 27000 40500 2800 228
6804 10206 4 4760 8.4 4.4 3.6 1.8 650 2.8 5.7 103
WKG 340 34000 51000 3500 270
8568 12852 5 5950 10.5 5.5 4.5 2.25 875 3.8 7.6 122
All units have 1/4” OD external equalizer and 3/4” F.P.T. drain connection.

Table 7. 50 Hz. Performance/Electrical Data for WKG Hot Gas Defrost Units.
Capacities Fan Data Motor Data Drain Pan Heaters Approx.
BTUH / kcal PSC Net
Model 10° F TD 15° F TD 110/1/50 220/1/50 Total 220/1/50 110/1/50 Weight
No. 6° C TD 8° C TD Qty CFM / m3h Amps Amps Watts Amps Amps (Lbs / kg)
WKG 100 9500 14300 2 1310 1.8 .9 320 1.5 2.9 131
2390 3600 2227 59
WKG 130 12400 18500 2 1330 1.8 .9 460 2.1 4.2 170
3120 4660 2261 77
WKG 155 14700 22100 2 1320 1.8 .9 460 2.1 4.2 174
3700 5570 2244 79
WKG 180 17100 25700 3 1920 2.7 1.35 460 2.1 4.2 185
4310 6480 3264 84
WKG 210 20000 29900 4 2560 3.6 1.8 595 2.7 5.4 223
5040 7530 4352 101
WKG 270 25700 38500 4 2530 3.6 1.8 595 2.7 5.4 228
6480 9700 4301 103
WKG 340 32300 48500 5 3160 4.5 2.25 800 3.6 7.3 270
8140 12220 5372 122
All units have 1/4” OD external equalizer and 3/4” F.P.T. drain connection.

Optional Liquid Line Bypass Kit For Reverse Cycle Hot Gas Defrost
The WKG may be field piped for reverse cycle defrost using the optional bypass kit.

When compressor vapor, in reverse cycle defrosting, is directed back into the evaporator
at the suction connection, it condenses into liquid. The field installed liquid line bypass
kit directs the condensed liquid around the thermostatic expansion valve and back
into the liquid line.

Bypass kits include bypass piping, check valve, and instructions. Adjustable fan
control is shipped loose with hot gas units.

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 Bohn Low Air Flow Unit Coolers

Table 8. Replacement Parts List

Model Number
Part Description WK050 WK075 WK100 WK130 WK155
WKE050 WKE075 WKE100 WKE130 WKE155
WKG100 WKG130 WKG155
Electrical Components Part Number*
Motor 115/1/60 Shaded Pole 5036S (1) 5036S (1) 5036S (2) 5036S (2) 5036S (2)
Motor 208-230/1/60 Shaded Pole 5036T (1) 5036T (1) 5036T (2) 5036T (2) 5036T (2)
Motor 115/1/60 or 110/1/50 PSC 5036N (1) 5036N (1) 5036N (2) 5036N (2) 5036N (2)
Motor 208-230/1/60 or 220/1/50 PSC 5036P (1) 5036P (1) 5036P (2) 5036P (2) 5036P (2)
Defrost termination switch “WKE” 4511C 4511C 5521R 5521R 5521R
Heater** 4401S (2) 4402S (2) 4543B (4) 4544B (4) 4544B (4)
Fan Components
Fan Blade 5110E (1) 5110E (1) 5110E (2) 5110E (2) 5110E (2)
Fan Guard 5505-F (1) 5505-F (1) 5505-F (1) 5505-F (1) 5505-F (1)
Cabinet Components
Fan Panel / Drain Pan C26769A2 C26770A2 C26771A2 C26771A2 C26771A2
Inner drain pan assembly: Air Defrost B25196A1 B25197A1 B25197A1 B25197A1 B25197A1
Inner drain pan: Electric & Hot Gas Defrost B24358A2 B24358B1 B24358A7 B24358A7 B24358A7
End panel (2 per unit) B24264A1 B24264A1 C26767A1 C26768A1 C26768A1
Side panel (4 per unit) A20673A1 A20673A1 B24493A1 B24494A1 B24494A1
Defrost termination switch (WKG models only) 4267W 4267W 4267W

Model Number
Part Description WK180 WK210 WK270 WK340
WKE180 WKE210 WKE270 WKE340
WKG180 WKG210 WKG270 WKG340
Electrical Components Part Number*
Motor 115/1/60 Shaded Pole 5036S (3) 5036S (4) 5036S (4) 5036S (5)
Motor 208-230/1/60 Shaded Pole 5036T (3) 5036T (4) 5036T (4) 5036T (5)
Motor 115/1/60 or 110/1/50 PSC 5036N (3) 5036N (4) 5036N (4) 5036N (5)
Motor 208-230/1/60 or 220/1/50 PSC 5036P (3) 5036P (4) 5036P (4) 5036P (5)
Defrost termination switch “WKE” 5521R 5521R 5521R 5521R
Heater** 4544B (4) 4545B (4) 4545B (4) 4546B (4)
Fan Components
Fan Blade 5110E (3) 5110E (4) 5110E (4) 5110E (5)
Fan Guard 5505F (3) 5505F (4) 5505F (4) 5505F (5)
Cabinet Components
Fan Panel / Drain Pan 40849203 40849303 40849303 40849403
Inner drain pan assembly: Air Defrost B25197A1 B25198A1 B25198A1 C26774A1
Inner drain pan: Electric & Hot Gas Defrost B24358A7 B24358A8 B24358A8 B24358A9
End panel (2 per unit) C26768A1 C26768A1 C26768A1 C26768A1
Side panel (4 per unit) B24494A1 B24494A1 B24494A1 B24494A1
Defrost termination switch (WKG models only) 4267W 4267W 4267W 4267W
FOR UNITS PRIOR TO “C” REVISION, PLEASE CONSULT FACTORY.
* Number in parenthesis is quantity per unit.
** All hot gas models have two heaters.

7
Table 9. Standard Nozzle Selections for WK Units (Included with unit for field installation)
No. of Distributor No. of Nozzles
Type Fans Tube Length Model Circuits R-404A** R-22
WK 1 18 50 2 L- 1/2 L- 1/3
Air 18 75 4 L- 3/4 L- 1/2
Defrost 2 18 100 6 L- 1 L- 3/4
24 130 12 E- 1 1/2 E- 1
24 155 10 E- 2 E- 1
3 24 180 12 E- 2 E- 1 1/2
4 24 210 12 E- 2 1/2 E- 1 1/2
24 270 20 C- 3 C- 2
5 24 340 20 C- 4 C- 2 1/2
WKE 1 18 50 2 L- 1/2 L- 1/3
Electric 18 75 4 L- 1 L- 3/4
Defrost 2 18 100 6 L- 1 1/2 L- 3/4
and 24 130 12 E- 1 1/2 E- 1
WKG 24 155 10 E- 2 E- 1 1/2
Hot Gas 3 24 180 12 E- 2 E- 1 1/2
Defrost 4 24 210 12 E- 2 1/2 E- 2
24 270 20 C- 3 C- 2
5 24 340 20 C- 4 C- 2 1/2
** also suitable for R-507, R-502, R-134a, R-401A, R-402A.
Distributor tube O.D. = 3/16" for all models.
Nozzles sized for 95˚ F liquid temp at expansion valve. Refer to Installation and Maintenance manual if liquid temp is not 95˚ F.
Room temperature of 35˚ F for air defrost models and 28˚ F for electric/hot gas models.
Consult your Bohn sales representative or the factory if evaporator TD is not 10˚-15˚ F, (room temp - saturated suction temp).
NOTE: REFRIGERATION SYSTEM WILL NOT PERFORM PROPERLY WITHOUT CORRECT NOZZLE!

The Cold Standard

2175 West Park Place Blvd. • Stone Mountain, GA 30087

Phone: 770-465-5600 • Fax: 770-465-5990
www.heatcraftrpd.com • Email: hrpd.feedback@heatcraft.com
A Heatcraft Refrigeration brand