Carrier 38AH044-084 specifications Start-Up, Preliminary Checks, Ð 06E Compressors, Typical

DISCHARGE	CYLINDER	OIL PRESSURE SWITCH AND	HIGH-	FAN CYCLING	DISCHARGE GAS
GAS THERMOSTAT	HEADS	CAPACITY CONTROL	PRESSURE	PRESSURE SWITCH	THERMOSTAT
		PRESSURE SWITCH CAPILLARIES	MUFFLER SWITCH

PRESSURE RELIEF	SIGHT	RAIL	CRANKCASE
VALVE	GLASS		HEATER

NOTE: Units 38AH044-084 and 38AH124, 134 compressors are pan mounted. Units 38AH094 and 104 compressors are mounted on rails.

OIL	LOW-	SIGHT	MOUNTING
EQUALIZER	PRESSURE	GLASS	SPRING
LINE	SWITCH		(HIDDEN)

Fig. 29 Ð 06E Compressors, Typical

START-UP

Compressor crankcase heaters must be on for 24 hours before start-up. To energize the crankcase heaters, set the space thermostat above the ambient so there will be no de- mand for cooling. Close the ®eld disconnect and turn on the fan circuit breakers. Leave the compressor circuit breakers off/open. The crankcase heaters are now energized.

Preliminary Checks

8.If any leaks are detected, evacuate and dehydrate as pre- viously outlined in Step 3 Ð Make Refrigerant Piping Connections, page 14.

Preliminary Oil Charge Ð Each compressor is fac- tory charged with oil (see Table 3A, 3B, 4A, or 4B). When oil is checked at start-up, it may be necessary to add or re- move oil to bring it to the proper level. One recommended oil level adjustment method is as follows:

1.Ensure that compressor service valves are backseated.

2.Verify that each compressor on units 38AH044-084, 124, and 134 ¯oats freely on its mounting springs. Verify that each compressor on units 38AH094 and 104 ¯oats freely on its rails.

3.Check that electric power supply agrees with unit name- plate data.

ADD OIL Ð Close suction shutoff valve and pump down crankcase to 2 psig (14 kPa). (Low-pressure cutout must be jumped.) Wait a few minutes and repeat until pressure re- mains steady at 2 psig (14 kPa). Remove oil ®ll plug above the oil level sight glass, add oil through plug hole, and re- place plug. Run compressor for 20 minutes and check oil level.

4.Verify that compressor crankcase heaters are securely in place.

5.Check that compressor crankcase heaters have been on at least 24 hours.

6.Note that compressor oil level is visible in the sight glass.

7.Recheck for leaks using same procedure as previously out- lined in Step 3 Ð Make Refrigerant Piping Connections, page 14.

IMPORTANT: For units with 2 compressors per re- frigeration circuit, both compressors must be running to adjust the oil level. Two oil level equalizer lines between compressors distribute the oil to each compressor.

38