Rheem R-410A Specifikace stáhnout pdf (Strana 17)

15.0 FIELD INSTALLED ACCESSORIES

15.1 COMPRESSOR CRANKCASE HEAT (CCH)

While scroll compressors usually do not require crankcase heaters, there are

instances when a heater should be added. Refrigerant migration during the off cycle

can result in a noisy start up. Add a crankcase heater to minimize refrigerate migra-

tion, and to help eliminate any start up noise or bearing “wash out.”

NOTE: The installation of a crankcase heater is recommended if the system charge

exceeds the values listed in Table 6.

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 ener-

gized for at least 12 hours before the compressor is started. (Disconnect switch on

and wall thermostat off.)

15.2 TIME DELAY CONTROL (TDC)

The time delay (TDC) is in the low voltage control circuit. When the compressor

shuts off due to a power failure or thermostat operation, this control keeps it off at

least 5 minutes which allows the system pressure to equalize, thus not damaging

the compressor or blowing fuses on start-up.

15.3 LOW AMBIENT CONTROL (LAC)

This component senses compressor head pressure and shuts the heat pump fan off

when the head pressure drops to approximately 220 PSIG [1516.8 kPa]. This

allows the unit to build a sufficient head pressure at lower ambient in order to main-

tain system balance and obtain improved capacity. Low ambient control should be

used on all equipment operated below 70°F [21.1°C] ambient.

TABLE 6

MAXIMUM SYSTEM CHARGE VALUES – 13 SEER (1-PHASE)

13 SEER Compressor Charge Limit

Model Model Without Crankcase

Size Number Heat (1 Phase)

18 ZP14K5E 9.6 lbs.

24 ZP20K5E 9.6 lbs.

30 ZP24K5E 9.6 lbs.

36 ZP34K5E 9.6 lbs.

42 ZP36K5E 12 lbs.

48 ZP42K5E 12 lbs.

60 ZP51K5E 12 lbs.

MAXIMUM SYSTEM CHARGE VALUES – 14.5 SEER

14.5 SEER Compressor Charge Limit

Model Model Without Crankcase

Size Number Heat (1 Phase)

18 ZP16K5E 9.6 lbs.

24 ZP20K5E 9.6 lbs.

30 ZP24K5E 9.6 lbs.

36 ZP31K5E 9.6 lbs.

42 ZP34K5E 12 lbs.

NOTE: Model sizes 48, 49, 56 and 60 have a factory installed crankcase heater.

MAXIMUM SYSTEM CHARGE VALUES – 13 SEER (3-PHASE)

13 SEER Compressor Charge Limit

Model Model Without Crankcase

Size Number Heat (3 Phase)

36 ZP34K5E 8 lbs.

42 ZP36K5E 10 lbs.

48 ZP42K5E 10 lbs.

NOTE: Model size 60 has a factory installed crankcase heater.

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