Carrier 38AH044 38AH044-134 Specifications download pdf (Page 42)

Table 16 — Index of Lead/Lag Circuits and Compressors

LEGEND

*Circuit has only one compressor.

†Units have only one circuit.

Check Compressor Oil Level — After adjusting the

refrigerant charge, allow each circuit to run fully loaded for

20 minutes. Running oil level should be

up on the sight

glass. Stop the compressors at the field power supply discon-

nect and check the crankcase oil level. Add oil only if neces-

sary to bring the oil into view in the sight glass. If oil is added,

run the circuit for an additional 10 minutes, then stop and check

oil level. If the level remains low, check the piping system for

proper design for oil return; also, check the system for leaks.

If the initial check shows too much oil (too high in the sight

glass) remove oil to proper level. See Preliminary Oil Charge

section on page 40 for proper procedure for adding and remov-

ing oil.

When the above checks are complete, repeat the procedure

with the unit operating at minimum load conditions.

UNITS 38AH044-084,124, AND 134 — For this minimum

load check, run the lead compressor of each refrigeration cir-

cuit fully unloaded with the lag compressor not operating.

Unload the compressor(s) by turning the control set point

adjustment nut counterclockwise until the adjustment nut

stops. The unloader is now at 0 psig (0 kPa) set point. If

electrically actuated unloaders are installed, energize the sole-

noid to unload the compressor. Recheck the compressor oil lev-

el as described earlier in Check Compressor Oil Level.

Return unloader to original setting after checks are

complete.

UNITS 38AH094,104 — For this minimum load check, the

lead compressor (A1, B1) of each refrigeration circuit is un-

loaded. See Table 16. The lag compressor (A2, B2 38AH104

only) of each refrigeration circuit must not be operating.

Unload the compressor(s) by turning the control set point

adjustment nut counterclockwise until the adjustment nut

stops. The unloader is now at 0 psig (0 kPa) set point. If electri-

cally actuated unloaders are installed, energize the solenoid to

unload the compressor.

Return unloader to original setting after checks are

complete.

Final Checks — Ensure all safety controls are operating,

control panel covers are on, and the service panels are in place.

UNIT

38AH

044-084

STD

044-084

OPT

094 104 124 134

LEAD CIRCUIT AAAA

Module

124A

Module

134A

Compressor, Lead A1 A1 A1 A1 A1 A1

Compressor; Lag *A2A2A2A2A2

LAG CIRCUIT B†BB

Module

124B

Module

134B

Compressor, Lead B1 B1 B1 A1 A1

Compressor; Lag * * B2 A2 A2

OPT — Optional Single-Circuit Units

STD — Standard Dual-Circuit Units

Fig. 35 — Charging Chart — Unit 38AH044; 50/60 Hz — Dual Circuit

1 ... 41 42 43 ... 56

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Carrier 38AH044 38AH044-134 Specifications Page 42

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