MODELS ACWC 15 THRU 40 RD
NOMENCLATURE
CWC
40
R
D
DIRECT DRIVE FANS
RECIPROCATING
COMPRESSORS
NOMINAL CAPACITY
AIR COOLED WATER CHILLER
DIRECT DRIVE FANS
6 POLE MOTORS DIE FORMED FAN OUTLETS
HEAVY GAUGE GALVANIZED STEEL CASING
HIGH CAPACITY CONDENSER COIL
HEAVY GAUGE STEEL FRAME
2 COMPARTMENT CONTROL CENTER
maintenance and long life. These are the most
advanced and efficient reciprocating compressors in
the industry; the Copeland DISCUS valve compressors. These heavy-duty, industrial quality, semihermetic compressors are designed for Refrigerant 22
and high loading associated with air cooled applications.
CASING - Bohn chillers are designed for 20 year life
starting with a cabinet offering unsurpassed corrosion
protection. The 12 gauge aluminum panels are far
superior to painted galvanized construction especially
since every punch, break, or scratch exposes raw steel
to the atmosphere. Steel cabinet standard.
The aluminum panels are mounted on a galvanized
steel frame with a painted, structured steel base. This
rugged construction stands up to any application.
Serviceable compressors offer reduced maintenance
costs because if problems develop with components
such as oil pumps, unloaders and pistons, they can be
serviced in the field without replacing the compressor.
Both suction and discharge service valves are provided to allow isolation of the compressor from the
refrigerant circuit.
Condenser fans are provided with aluminum baffles to
prevent air bypass through non-operating fans.
DUAL COMPRESSORS - Dual compressor units are
available in 3 sizes (22, 32 and 40 tons) for critical
applications requiring standby capacity. These units
also offer more accurate capacity control (4 steps)
than any single compressor arrangement. Each compressor is provided with an independent refrigerant
circuit
OPTIONAL FLEXIBILITY - The ACWC chiller offers
unsurpassed flexibility including the following, factory
installed options:
1) High ambient or return water unloaders
2) Fused disconnect
3) Compressor spring isolators
4) Low ambient to -20º F.
ACCEESIBLE
HERMETIC COMPRESSORS-Rugged
compressors, specifically designed for air cooled
chiller application, are field serviceable for ease of
2
STANDARD UNIT SPECIFICATIONS
CONDENSER
Casing - Heavy duty, corrosion resistant aluminum panels
CONTROL CENTER
A fully enclosed and weatherproofed control panel with access
door. Dual compartments separate safety and operating controls
from power controls.
are provided. Each fan section is separated by full width and length
baffles to prevent air by-pass and to provide additional casing
reinforcement.
1) Main power terminal block.
2) Terminals for 115V control circuit power.
contactor(s)
3) Compressor
4) Manual reset high pressure control.
5) Low pressure control.
6) Manual reset oil safety control.
7) Manual reset freezestat (temperature).
6) Temperature control thermostat.
9) Crankcase heater.
10) Cooler heater.
11) Manual pumpdown switch.
12) Fan cycling (pressure).
13) Remote alarm terminals.
14) Remote pumpdown terminals.
15) Staggered start (dual compressors only).
16) Lead-lag switch (dual compressors only).
Condenser Coil - 3/8” O.D.copper
tubes completely covered with
plate type, die formed aluminum fins having self-spacing collars
mechanically bonded to the tubes. Coil is divided into two independent circuits on 2 compressor models.
SubCooling Coil - A separate sub-cooling coil integral with the
main condenser coil is provided for each refrigerant circuit.
Condenser Fans - Individually driven, multiple propeller type fans
are statically and dynamically balanced and operate at low tip
speeds for minimum noise and vibration. Each fan orifice is die
formed eliminating fan panel vibration and reducing air outlet noise.
Direct drive fans are constructed of heavy gauge aluminum blades
securely riveted to zinc plate steel center hubs.
Condenser Fan Motors - All fan motors are heavy duty with
inherent thermal protection providing built-in protection against
burnouts and single phasing.
All models have direct drive, 6 pole motors with permanently
lubricated ball bearings. Motors are single phase.
CAPACITY CONTROL
Units are equipped with the following capacity control steps as
standard:
Fan Guards -Constructed of heavy gauge, close meshed steel wire
with
corrosion
protection.
ACWC 15,20,25
ACWC 30,39
ACWC 22,32,40
COMPRESSORS
Accessible hermetic motor-compressors are employed. The compressor and hermetic induction motor are specifically engineered
and matched for optimum performance. The compressor is designed
for Refrigerant-22 and the high loading associated with air cooled
applications. Oil pump, unloaders and cylinder heads are readily
accessible for replacement. Suction and discharge service valves
are provided.
ELECTRICAL
100,50,0%
100,67,0%
100,75.50,25,0%
CHARACTERISTICS
Standard electrical characteristics are:
60 Hertz: 208-230-460-575/3/60
50 Hertz: 200-220-380-490-500/3/50
Standard control circuit is 115/1/50-60
Motor - Hermetic, induction type, refrigerant gas cooled with
inherent thermal protection. Finned motor housing dissipates heat;
keeps motor heat out of the crankcase. Motor terminal box is located
above the crankcase oil level.
REFRIGERANT PIPING
Individual
refrigerant
circuits
include:
Liquid Line -
Safety Protection - Internal relief valve to relieve discharge to
suction at high compression ratios as required by ASA-B9.1 safety
code requirements. The compressor is provided with internal
overload protection.
1)
2)
3)
4)
5)
Pressure relief
Liquid line sight glass.
Liquid line solenoid and liquid line shutoff.
Filter-drier.
Expansion valve.
Suction Line - furnished with insulated suction line and suction
strainers.
FAN CYCLING LOW AMBIENT CONTROL
Fans are cycled in response to head pressure to maintain head
pressure to +30° F. ambient.
Discharge Line -formed of pre-bent tubing or elbow fittings with
long radius bends to eliminate vibration and minimize pressure
drop.
CHILLER EVAPORATOR
A direct expansion, shell and tube type with water flowing through
the baffled shell and refrigerant through the tubes. Independent
refrigerant circuits are furnished for each compressor.
ASSEMBLY
Units are assembled as a single package on one base as follows:
Steel refrigerant heads with multi-pass baffles to assure oil return.
Heads are removable to allow access to the tubes from either end.
Heavy gauge mounting frame, supported by multiple heavy gauge
galvanized steel legs and two structural steel skids with corrosion
resistant finish.
Units are completely leak tested, evacuated and charged, and fully
run tested before shipment.
ASME Compliance-Built in accordance with Section VIII, Division
1 of the ASME Code for unfired pressure vessels and stamped
accordingly.
Design Working Pressures-Shell (fluid) side is 150 PSIG; tube
(refrigerant) side is 200 PSIG.
Protection-Chiller is equipped with a thermostatically controlled
electric resistance heater cable wrapped helically around the shell,
under ¾” closed cell foamed plastic insulation with vapor seal, for
freeze protection to -20º ¼.
3
OPTIONAL ACCESSORIES
HOT GAS BYPASS CONTROL (NO LEAD LAG)
A hot gas modulating valve and solenoid valve are
factory installed on the refrigerant circuit having the
1st compressor on. This modulating valve allows unit
capacity control down to 10% of full load.
INDICATING LIGHTS
Indicating lights are factory mounted on the unit
exterior to indicate compressor failure, whether the
compressor is on or off, and whether power is provided
to the controls.
PRESSURE GAUGES
Two inch suction and discharge pressure gauges are
provided for each refrigerant circuit and two inch oil
pressure gauge is provided for each compressor. Each
gauge is furnished with its own shut-off valve. Factory
installation includes mounting and piping to the
compressors.
COMPRESSOR HOUR METERS
Compressor run time meters are factory installed to
facilitate maintenance.
HEATED RECEIVER LOW AMBIENT CONTROL
TO 0° F.
Utilizes heated and insulated oversized receivers in
conjunction with standard fan cycling controls to
assure compressor motor start in ambient temperature
down to 0” F. Each heated receiver is equipped with a
spring loaded relief valve, pressure control, thermostat
and check valve.
PHASE LOSS MONITOR
Protects against phase loss (single phasing), phase
reversal (improper phase sequence), and low voltage.
Field adjustable for low voltage set point.
CIRCUIT BREAKERS (COMPRESSORS)
Companion trip, ambient calibrated circuit breakers
with built-in three leg overload protection provides
additional protection for compressors.
CONTROL CIRCUIT TRANSFORMER
A factory mounted and wired control circuit transformer is furnished eliminating the need for running a
separate 115 volt power line for the unit control circuit.
An optional transformer reduces line voltage to the 115
volts required.
LIMITIZER LOW AMBIENT CONTROL TO -20° F.
Utilizes refrigerant pressure activated modulating
valves in conjunction with standard fan cycling controls
to assure unit operation and compressor start down to
-20° F.
OPTIONAL FREEZE PROTECTION
The ACWC-RD includes a temperature sensing freezestat as standard. However potentially damaging freeze
condtions can occur even if average leaving water
temperatures are in excess of 35º F. Malfunction of the
temperature sensing control can also occur. Bohn
offers additional freeze protection in the form of
pressure sensing freezestats, and time delay, on each
circuit for unsurpassed protection against a very
expensive failure.
FUSED DISCONNECT AND INTERLOCK
A fused disconnect is factory installed in the control
panel with a “through the door” handle. Entrance to
the control panel is prevented unless power is shut off.
Power can be restored when the access door is open.
HIGH RETURN WATER UNLOADING THERMOSTAT
Prevents the chiller from fully loading at start-up until
the system chilled water has been sufficiently cooled
to avoid nuisance tripout problems.
Water Flow Switch - Stops compressor(s) on interruption of water flow. Flow switch is shipped with the
unit for field installation in external chilled water return
piping.
HIGH AMBIENT UNLOADING THERMOSTAT
Allows part load operation at ambients in excess of
115º F. ambient and avoids safety cut outs on high
head pressure.
VIBRATION ELIMINATORS
The following arrangements are offered.
1) Rubber or spring isolators for the entire unit (field
installed).
2) Factory installed compressor spring isolators (1”
deflection) and flexible refrigerant connectors.
FIVE MINUTE LOCKOUT TIMER
A five minute, solid state timer delays compressor
restart for five minutes after compressor shutdown.
PART WINDING START (NA on sizes 22 and 32)
For applications where current inrush is limited. Provides two step starting for each compressor motor.
4
CAPACITY DATA
Single Compressor Units
MODEL #
LWT
ºF
90
95
MBH
KW
MBH
KW
100
MBH
KW
AMBIENT AIR -ºF
105
110
MBH
KW
MBH
KW
115
MBH
KW
120(4)
MBH
KW
ACWC
15 RD
42
44
45
46
48
204
211
215
218
225
16. 1
16. 4
16. 5
16. 5
16. 8
198
205
210
213
219
16. 7
16. 9
17. 0
17. 1
17. 4
193
200
204
208
214
17. 5
17. 7
17. 8
17. 9
18. 2
187
194
198
201
207
18. 0
18. 3
18. 4
18. 5
18. 8
181
188
192
195
201
18. 9
19. 1
19. 2
19. 3
19. 6
176
183
186
189
195
19. 8
20. 0
20. 1
20. 1
20. 3
171
177
180
183
189
20. 0
20. 3
20. 5
20. 7
21. 0
ACWC
20 RD
42
44
45
46
48
248
254
260
265
272
21. 8
22. 5
22. 8
23. 0
23. 4
239
248
252
257
265
23. 1
23. 5
23. 7
23. 9
24. 3
232
241
245
249
257
23. 9
24. 3
24. 5
24. 7
25. 2
225
233
237
241
248
24. 5
25. 0
25. 2
25. 4
25. 9
218
226
230
234
241
25. 2
25. 7
26. 0
26. 3
26. 8
212
220
224
227
233
25. 8
26. 4
26. 7
27. 0
27. 7
206
213
217
220
228
26. 4
26. 9
27. 4
27. 8
28. 5
ACWC
25 RD
42
44
45
46
48
26. 6
27. 1
27. 2
27. 3
27. 7
275
284
289
294
302
27. 2
27. 7
28. 0
28. 3
28. 8
267
276
281
286
294
27. 8
28. 4
28. 7
29. 0
29. 7
259
268
272
276
284
28. 6
29. 1
29. 3
29. 6
30. 2
244
252
256
260
268
30. 1
30. 8
31. 1
31. 5
32. 3
237
245
249
252
261
30. 8
31, 6
31. 9
32. 2
33. 0
42
44
45
46
48
33. 3
33. 9
34. 1
34. 3
34. 8
343
354
360
366
376
34. 3
34. 8
35. 0
35. 3
35. 8
333
344
350
356
367
35. 4
35. 9
36. 1
36. 4
37. 0
324
333
339
345
356
36. 4
36. 9
37. 1
37. 4
38. 0
277
316
327
333
339
347
29. 3
30. 0
30. 3
30. 7
31. 4
ACWC
30 RD
283
293
296
301
310
353
363
370
377
386
37. 5
38. 0
38. 2
38. 4
38. 9
307
317
322
327
337
38. 7
39. 1
39. 4
39. 6
40. 1
299
310
315
320
330
39. 9
40. 3
40. 4
40. 6
41. 2
ACWC
39 RD
42
44
45
46
48
423
436
442
449
462
40. 9
41. 9
42. 5
42. 8
43. 6
409
422
428
434
446
42. 2
43. 0
43. 4
43. 8
44. 6
398
411
418
424
437
43. 3
44. 3
44. 8
45. 4
46. 5
386
399
405
411
423
44. 9
45. 7
46. 2
46. 6
47. 5
373
385
391
397
409
46. 0
46. 9
47. 3
47. 8
48. 7
361
372
378
384
394
47. 5
48. 3
48. 7
49. 1
49. 9
349
360
365
370
382
49. 0
49. 5
50. 0
50. 5
51. 2
252
261
265
269
Dual Compressor Units
MODEL #
LWT
ºF
AMBIENT AIR-ºF.
90
95
KW
17. 6
17. 8
18. 0
18. 1
18. 4
MBH
223
232
236
240
248
KW
18. 4
18. 6
18. 7
18. 8
19. 1
100
MBH
KW
105
MBH
KW
110
MBH
KW
115
MBH
KW
120(4)
MBH
KW
217
226
230
234
242
19. 0
19. 2
19. 3
19. 5
19. 8
210
219
223
227
235
19. 8
20. 1
20. 2
20. 4
20. 6
205
213
217
220
227
20. 5
20. 8
20. 9
21. 1
21. 4
199
206
210
214
220
21. 2
21. 4
21. 6
21. 7
22. 0
193
200
204
208
214
21. 9
22. 2
22. 4
22. 5
22. 8
AC WC
22 R D
42
44
45
46
48
MBH
231
240
243
246
254
AC WC
32 R D
42
44
45
46
48
350
360
365
370
382
29. 9
30. 2
30. 4
30. 6
31. 3
341
352
358
363
373
30. 7
31. 3
31. 6
31. 9
32. 5
331
342
348
353
363
32. 1
32. 7
33. 0
33. 3
34. 0
322
332
337
342
352
33. 0
33. 7
34. 0
34. 4
35. 2
312
322
327
331
339
33. 9
34. 6
34. 9
35. 3
36. 9
301
311
316
321
331
35. 1
35. 8
36. 1
36. 5
37. 2
292
301
306
312
320
36. 0
36. 9
37. 3
37. 6
38. 1
AC WC
40 R D
42
44
45
46
48
427
441
449
458
473
40. 1
40. 8
41. 4
41. 8
42. 6
415
430
437
444
458
41. 3
42. 1
42. 5
42. 9
43. 8
401
416
423
430
445
42. 5
43. 5
43. 9
44. 3
45. 4
390
404
411
418
432
43. 8
44. 7
45. 2
45. 7
46. 7
377
391
398
405
418
44. 9
45. 8
46. 3
46. 8
47. 8
363
377
384
390
403
45. 7
46. 8
47. 3
47. 9
49. 1
352
363
368
375
390
46. 9
47. 8
48. 2
48. 5
50. 0
Notes:
1. Ratings and contents are based on a 10º differance between EWT and LWT and sufficiently accurate for 8-12º differences.
2. Ratings are based on a .0005 fouling factor. For a .OO1 factor use the following correction:
total capacity x .98
compressor KW x .99
3. KW is for the compressor only.
4. Ratings are based on 60 hz power. For 50 hz use the following correction:
total capacity x .88
compressor KW x .83
120° ambient on 50 hz only
5
PHYSICAL DATA
Model AC WC
Si ngl e C ompr ess or
Dual C ompr ess or
15 R D
(1) 20
20 R D
(1) 25
25 R D
(1) 30
30 R O
(1) 35
39 R D
(1) 40
120
100
24.2
120
100
24.2
136
100
24.2
144
100
32.2
220
200
32.2
2
(3) 24
(3)¾
1140
8x48
2
(3) 24
(3)¾
1140
8x48
3
(3) 24
(3) ¾
1140
8x60
3
(4) 24
(4)¾
1140
8x60
4
(4) 24
(4)¾
1140
8x84
3
(3) 24
(3)¾
1140
8x48
3
(4) 24
(4)¾
1140
8x60
4
(4) 24
(4)¾
1140
8x84
WaterConn.(in.)
Net Water Volume
Electric Heater Watts
Refrig. Charge R22 Circ. #1/Circ. #2
3" N PT
8
210
23
3" N PT
8
210
23
3" N PT
10
210
29
3" N PT
10
210
33
3" N PT
14
210
42
3" N PT
8
210
16/16
3" N PT
10
210
19/19
3" N PT
14
210
25/23
Approx. Operating Weight (Ibs.)
1800
1820
2000
2170
2310
2170
2510
2670
Quantityand Horsepower Circ. #1
Quantityand Horsepower Circ. #2
Oil Charge (oz.)
Crankcase Heater Watts (115v)
Face Area (Sq. Ft.)
Rows Deep
Fans No. and Dia. (in.)
Motors No. and H.P.
RPM (motor)
Diameter & Tube Length (shell and tube)
6
22 R D
32 R D
40 R D
(1) 7½
(1) 15
(1) 25
(1) 7½
(1) 15
(1) 20
128/128 128/128 120/120
65/65
65/65
100/100
12.1/12.1 16.1/16.1 16.9/15.3
EL ECT RICAL DATA
Compress ors
#1
Model
No.
15 RD
20 RD
25 RD
30 RD
39 RO
22 RD
32 RO
40 RD
Voltage
Type
Start
230
230
460
460
575
575
230
230
460
460
575
575
230
230
460
460
575
575
230
230
460
460
575
575
200
200
230
230
460
460
575
575
230
460
575
230
460
575
230
230
460
460
575
575
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
PW
A/L
A/L
A/L
A/L
A/L
A/L
A/L
PW
A/L
PW
A/L
PW
RLA
62.8
62.6
31.4
26.8
25.6
25.6
76.9
76.9
38.5
41.6
30.8
30.8
105.8
105.8
52.9
52.9
38.5
38.5
112.2
112.2
56.1
60.6
44.9
44.9
152.6
152.6
126.9
126.9
63.5
62.2
51.3
51.3
36.8
16.0
14.7
53.5
26.0
21.2
76.9
76.9
38.5
41.6
30.8
30.8
LRA
308
188
154
84
135
81
428
250
214
117
172
103
470
292
235
141
200
130
565
340
283
156
230
138
660
400
594
340
297
170
235
135
215
106
84
275
138
110
428
250
214
117
172
103
RLA
36.8
16.0
14.7
53.5
26.0
21.2
62.8
62.8
31.4
28.8
25.6
25.6
Min.
Circuit
Ampacity
Fan Motor
#2
LRA
215
106
84
275
138
110
308
188
154
84
135
81
KW
Total
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
3.3
3.3
3.3
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
No.
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
3
4
4
4
4
4
4
4
4
4
FLA
Total
8.8
8.8
4.4
4.4
4.4
4.4
8.8
8.8
4.4
4.4
4.4
4.4
8.8
8.8
4.4
4.4
4.4
4.4
13.5
13.5
6.8 ;
6.8
6.8
6.8
13.5
13.5
13.5
13.5
6.8
6.8
6.8
6.8
8.8
4.4
4.4
13.5
6.8
6.8
13.5
13.5
6.8
6.8
6.8
6.8
LRA
Total
20.2
20.2
10.1
10.1
10.1
10.1
20.2
20.2
10.1
10.1
10.1
10.1
20.2
20.2
10.1
10.1
10.1
10.1
27
27
13.6
13.6
13.6
13.6
27
27
27
27
13.6
13.6
13.6
13.6
20.2
10.1
10.1
27
13.6
13.6
27
27
13.6
13.6
13.6
13.6
87.3
87.3
43.7
40.4
35.5
35.5
104.9
104.9
52.5
56.4
42.0
42.0
141.1
141.1
70.5
70.5
51.6
51.6
153.8
153.8
76.9
82.6
61.5
61.5
204.3
204.3
172.1
172.1
86.2
84.6
69.5
69.5
91.6
40.4
36.6
133.9
65.3
53.1
172.4
172.4
86.3
87.6
69.5
69.5
Recommended
Wire
Size
3
3
8
8
8
8
2
2
6
6
8
8
1/0
1/0
4
4
6
6
2/0
2/0
4
4
6
6
4/0
4/0
2/0
2/0
3
4
4
4
3
8
8
1/0
4
6
2/0
2/0
3
3
4
4
Fuse
Size
125
125
60
60
50
50
150
150
80
80
60
60
200
200
100
100
80
80
225
225
110
125
90
90
300
300
250
250
125
125
100
100
125
50
45
175
80
70
225
225
110
110
90
90
Max.
Fuse
Size
150
150
70
60
60
60
175
175
90
90
70
70
225
225
110
110
90
90
250
250
125
125
100
100
350
350
250
250
125
125
110
110
125
50
50
175
90
70
225
225
110
125
100
100
NOTES:
1. A/L: Across the Line. PW: Part Winding.
2. Rated Load Amps comply with compressor motors continuous current rating and N.E.C. Article 440-52,b,2.
3. Locked rotor amps for PW start are for the first winding for one second. Compressor motors are sequence started with a 15 second time delay
between starts.
4. Minimum circuit ampacity as per N.E.C. Section 430-24.
5. Wire size based on copper conductors with 75° C. insulation per N.E.C. Table #310-16.
6. Use time delay (dual element) fuses only based on N.E.C. Section 440-22. On units involving a combination of high ambient and low voltage the
maximum fuse size should be used rather than the recommended fuse size.
7
DIMENSIONAL DATA:
DIMENSIONS
D = Tube Pull Clearance
= Dual Compressor Units
l
P.O. BOX 2625, RIYADH 11461
TEL. 265 1500 FAX. 265 1521
www.hacegoldenstar.com, email: goldenstar@ogertel.com
P.0
Manufactured in Saudi Arabia Under Licence of BOHN manufacturing company - USA.
DESIGN AND SPEClFlCATlONS ARE SUBJECT TO CHANGE
WITHOUT NOTICE