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Table 7-15 Refrigerant charge for H/P system
60
Heating Mode
Mode
60
De Chauffage
135
431
128
405
121
379
114
354
107
328
100
302
93
291
86
280
79
270
72
259
65
248
58
51
44
37
30
8 SYSTEM OPERATION
8.1 Compressor Crankcase Heater
(Optional)
Refrigerant migration during the off cycle can result in a
noisy start up. Add a crankcase heater to minimize
refrigeration migration, and to help eliminate any start up
noise or bearing "wash out".
All heaters are located on the lower half of the
compressor shell. Its purpose is to drive refrigerant from
the compressor shell during long off cycles, thus
preventing damage to the compressor during start-up.
At initial start-up or after extended shutdown periods,
make sure the heater is energized for at least 12 hours
before the compressor is started. (Disconnect switch on
and wall thermostat off.)
The crankcase heater will start up or shut down
according to the following logic:
The crankcase heater will start up when the compressor
is off and T4<41°F.
The crankcase heater will shut down when T4 ≥ 45 °F
In any condition, the crankcase heater will shut down
when the compressor is on
8.2 Protection
8.2.1 Protection for HP system
If sensors(T3&T4) become open-circuit or short-circuit,
the compressor ,outdoor fan motor and reversing valve
circuit will shut down.
Discharge temperature protection:
If discharge temp. is > 239°F, the compressor will shut
down, If discharge temp. is < 167°F, the compressor will
resume operation.
Heating Charge Chart/Tableau De Charge de Chauffage
Indoor Dry Bulb Temperature(oF)/Temperature Interieur au Themometre sec(en oF)
62
64
66
68
High Pressure Service Port(psig)/Vanne Détecté de Pression Haute(en psig)
439
447
455
463
413
421
429
436
387
395
402
410
383
361
368
376
335
342
349
357
309
316
323
330
298
305
312
318
287
294
300
307
276
282
289
295
265
271
277
284
254
260
266
272
265
20
70
72
74
76
78
471
479
487
495
503
444
452
460
468
475
417
425
433
440
448
391
398
405
413
420
371
378
385
393
364
358
365
337
344
351
325
332
339
346
353
313
320
327
334
341
302
309
316
323
330
290
297
304
311
318
278
285
292
299
306
271
278
285
292
299
264
271
278
285
292
264
271
278
285
264
271
278
High pressure protection
If high pressure is ＞609PSIG,the compressor and the
outdoor fan motor will stop running.
If high pressure is ＜464PSIG,the compressor and the
outdoor fan motor will resume running(3 minutes delay
necessary ).
Low pressure protection
When low pressure is ＜21PSIG,the compressor and
the outdoor fan motor will stop running.
When low pressure is ＞44PSIG,the compressor and
the outdoor fan motor will resume running(3 minutes
delay necessary ).
In stand-by status, if low pressure protection was
detected, the compressor will not start.
If protection cycles occur four times within 30 minutes,
the compressor and outdoor fan will shut down. In this
condition, the system needs to power on once more in
order to keep on working.
T4 function:
When T4 is < 5 °F, the compressor will stop. If the
electrical heater kit is installed in the indoor unit, the
outdoor unit will send the operation signal to the indoor
unit.
When T4 is > 10.4 °F, the compressor will restart .
8.3 Defrost Mode Introduction
(Heat Pump Only)
Manual defrost mode
To manually cycle the defrost mode, set switch SW3-1
to the "ON" position (See Fig 8-1). The system will
engage a defrost cycle, and automatically exit defrost
mode once the Shut-down conditions of defrost mode
described below are met.
Caution: Once the manual defrost mode is finished,
please set switch SW3-1 back to "OFF".
80
82
511
518
483
490
455
462
428
435
400
407
372
379
360
367
348
355
337
344
325
332
313
320
306
313
299
306
292
299
285
292
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