Manual 2100-670B
Page
32 of 33
Pressure Service Ports
High and low pressure service ports are installed on
all units so that the system operating pressures can be
observed. Pressures are shown in Table 10.
This unit employs high-flow Coremax valves instead of
the typical Schrader type valves.
TABLE 10
Cooling Pressures
Low side pressure ± 4 PSIG
High side pressure ± 10 PSIG
Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge
being in the system, the charge should be removed and system evacuated and recharged to serial plate charge weight.
NOTE:
Pressure table based on high speed condenser fan operation. If condensing pressures appear elevated check
condenser fan wiring. See “Condenser Fan Operation” on page 20.
Full Load Cooling
Air Temperature Entering Outdoor Coil °F
Model
Return Air Temp
(DB/WB)
Pressure
75
80
85
90
95
100 105 110 115 120 125
HR36
75/62
Low Side
High Side
130
290
131
312
132
334
134
359
135
384
136
411
137
439
138
468
139
498
140
530
142
564
80/67
Low Side
High Side
139
297
140
320
141
343
143
368
144
394
145
422
147
450
148
480
149
511
150
544
152
578
85/72
Low Side
High Side
144
307
145
331
146
355
148
381
149
408
150
437
152
466
153
497
154
529
155
563
157
598
HR58
75/62
Low Side
High Side
129
318
130
340
131
365
132
389
133
414
134
440
136
467
137
495
137
527
139
553
140
584
80/67
Low Side
High Side
138
326
139
349
140
374
141
399
142
425
143
451
145
479
146
508
147
537
149
567
150
599
85/72
Low Side
High Side
143
337
144
361
145
387
146
413
147
440
148
467
150
496
151
526
152
556
154
587
155
620
Part Load Cooling
Air Temperature Entering Outdoor Coil °F
Model
Return Air Temp
(DB/WB)
Pressure
75
80
85
90
95
100 105 110 115 120 125
HR36
75/62
Low Side
High Side
119
268
125
288
131
308
136
331
140
354
143
378
146
405
148
432
149
460
150
490
149
522
80/67
Low Side
High Side
127
275
134
295
140
316
145
339
150
363
153
388
156
415
158
443
159
472
160
503
159
535
85/72
Low Side
High Side
131
285
139
305
145
327
150
351
155
376
158
402
161
430
164
459
165
489
166
521
165
554
HR58
75/62
Low Side
High Side
135
283
136
304
136
327
137
350
137
375
138
402
138
428
140
456
141
486
142
416
143
547
80/67
Low Side
High Side
144
290
145
312
145
335
146
359
147
385
148
412
148
439
150
468
151
498
152
529
153
561
85/72
Low Side
High Side
149
300
150
323
150
347
151
372
152
398
153
426
154
454
155
484
156
515
157
548
158
581
WARNING! Do NOT use a Schrader valve core removal
tool with these valves. Use of such a tool could result
in eye injuries or refrigerant burns!
To change a Coremax valve without first removing the
refrigerant, a special tool is required which can be
obtained at www.fastestinc.com/en/SCCA07H. See the
replacement parts manual for replacement core part
numbers.
