Instruction manual

ManualsBrandsRuud ManualsAir ConditionerAPM-JAZ MODEL SERIES - 14.5 SEER

HIGH AND LOW PRESSURE CONTROLS

(HPC OR LPC)

These controls keep the compressor from operating in pressure ranges which can

cause damage to the compressor. Both controls are in the low voltage control cir-cuit.

High pressure control (HPC) is a manual reset which opens near 610 PSIG. Do not

eset arbitrarily without first determining what caused it to trip.

The low pressure control (LPC) is an automatic reset which opens near 50 PSIG and

closes near 95 PSIG.

NOTE: High and low pressure controls are standard on all (-)ANL, (-)APL, (-)APM

models.

FIELD INSTALLED ACCESSORIES

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 refrigeration

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

NOTE: A crankcase heater heater should be installed if: the charge of the system

exceeds the values in Tables 4 and 5, if the system is subject to voltage variations

or when a low ambient control is used for system operation below 55°F.

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.)

TABLE 9

MAXIMUM SYSTEM CHARGE VALUES (-)ANL

(-)ANL Charge Limit Charge Limit

Model Compressor Without Crankcase Without Crankcase

Size Model Number Heat (3 Phase) Heat (1 Phase)

18 ZP16K5E 8 lbs. 9.6 lbs.

24 ZP21K5E 8 lbs. 9.6 lbs.

30/31 ZP25K5E 8 lbs. 9.6 lbs.

36/37 ZP34K5E 10 lbs. 12 lbs.

42 ZP36K5E 10 lbs. 12 lbs.

43 ZP38K5F 10 lbs. 12 lbs.

48/49 ZP42K5E 10 lbs. 12 lbs.

60 ZP54K5E 10 lbs. 12 lbs.

TABLE 10

MAXIMUM SYSTEM CHARGE VALUES (-)APL

(-)APL Charge Limit

Model Compressor Without Crankcase

Size Model 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 ZP36K5E 12 lbs.

48 ZP42K5E 12 lbs.

60 ZP51K5E 12 lbs.

TABLE 11

MAXIMUM SYSTEM CHARGE VALUES (-)APM

(-)APM Charge Limit