Carrier 38AH044 38AH044-134 Specifications download pdf (Page 40)

Required Compressor Modification for

38AH044-084 Optional Single-Circuit Units,

When Compressor A1 is Out —

To maintain unit

operation, compressor no.1 must be operable. If it is not opera-

ble, the following temporary modifications must be made to

keep the unit running:

1. Change the oil pressure switch connections from com-

pressor A1 to compressor A2.

2. Connect compressor A2 into the Time Guard circuit as

compressor A1 was originally.

3. Open compressor A1 circuit breaker.

NOTE: Make sure the crankcase heaters are energized when

compressors are off.

Preliminary Checks

1. Ensure that compressor service valves are backseated.

2. Verify that each compressor on units 38AH044-084,

124, and 134 floats freely on its mounting springs. Ver-

ify that each compressor on units 38AH094 and 104

floats freely on its rails.

3. Check that electric power supply agrees with unit

nameplate data.

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

outlined in Step 3 — Make Refrigerant Piping Con-

nections, page 15.

8. If any leaks are detected, evacuate and dehydrate as

previously outlined in Step 3 — Make Refrigerant Pip-

ing Connections, page 15.

Preliminary Oil Charge — Each compressor is facto-

ry charged with oil (see Tables 3A-4B). When oil is checked at

start-up, it may be necessary to add or remove oil to bring it

to the proper level. One recommended oil level adjustment

method is as follows:

ADD OIL — Close suction shutoff valve and pump down

crankcase to 2 psig (14 kPa). (Low-pressure cutout must be

jumpered.) Wait a few minutes and repeat until pressure re-

mains steady at 2 psig (14 kPa). Remove oil fill plug above the

oil level sight glass, add oil through plug hole, and replace

plug. Run compressor for 20 minutes and check oil level.

FAN CONTACTORS

COMPRESSOR

CIRCUIT

BREAKERS

FAN CIRCUIT

BREAKER

TERMINAL

BLOCKS

TIMERS

TIME-DELAY

RELAY

OIL PRESSURE

SWITCHES

FUSE

HOLDERS

COMPRESSOR

CONTACTORS

TERMINAL

BLOCKS

TRANSFORMERS

Fig. 33 — Unit Control Box

NOTE: Fan rotation is clockwise when viewed from top of unit.

Fig. 34 — Condenser Fan Adjustment

IMPORTANT: For units with 2 compressors per refrig-

eration circuit, both compressors must be running to

adjust the oil level. Two oil level equalizer lines between

compressors distribute the oil to each compressor.

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Carrier 38AH044 38AH044-134 Specifications Page 40

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