Carrier 38AH044-084 specifications

Table 16 Ð Index of Lead/Lag Circuits and Compressors

UNIT	044-084	044-084	094	104	124	134
38AH	STD	OPT
LEAD CIRCUIT	A	A	A	A	Module	Module
					124A	134A
Compressor, Lead
	A1	A1	A1	A1	A1	A1
Compressor; Lag	*	A2	A2	A2	A2	A2
LAG CIRCUIT	B	²	B	B	Module	Module
					124B	134B
Compressor, Lead
	B1		B1	B1	A1	A1
Compressor; Lag	*		*	B2	A2	A2

LEGEND

OPT Ð Optional Single-Circuit Units STD Ð Standard Dual-Circuit Units *Circuit has only one compressor.

²Units have only one circuit.

Check Compressor Oil Level Ð After adjusting the refrigerant charge, allow each circuit to run fully loaded for 20 minutes. Running oil level should be 1¤8 to 1¤3 up on the sight glass. Stop the compressors at the ®eld power supply disconnect and check the crankcase oil level. Add oil only if necessary 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 for proper procedure for adding and removing oil.

When the above checks are complete, repeat the proce- dure with the unit operating at minimum load conditions.

UNITS 38AH044-084,124, AND 134 Ð 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 kPag) set point. If

electrically actuated unloaders are installed, energize the so- lenoid to unload the compressor. Recheck the compressor oil level as described in Check Compressor Oil Level above.

Return unloader to original setting after checks are complete.

UNITS 38AH094,104 Ð 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 kPag) 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 Ð Ensure all safety controls are operat- ing, control panel covers are on, and the service panels are in place.

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