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Compressors

LUBRICATION
Compressors are charged with the correct amount of oil at the

factory.

REPLACING COMPRESSOR
The compressor used with Puron refrigerant contains a POE oil.

This oil has a high affinity for moisture. Do not remove the com

pressor’s tube plugs until ready to insert the unit suction and dis

charge tube ends.

1. Remove all sources of power to the unit. Install lock-out tag.

2. Recover refrigerant using environmentally friendly

procedures.

3. Remove electrical wires from compressor terminal. Caution

must be used when removing wires from compressor termi

nals. Use pliers, gloves, safety glasses and do not face

directly towards the compressor terminals. Terminal blow

out could occur.

4. With refrigerant completely recovered, open both sides of

manifold gage set. Refrigerant system should now be at

ambient pressures.

5. Prior to applying heat and removing compressor, procure a

wet quenching cloth and fire extinguisher.

6. Using torch, heat compressor discharge line and remove hot

gas tube from compressor.

7. Using torch, heat compressor suction line and remove suction

tube from compressor.

8. Remove system filter drier and replace with new.
9. Loosen four compressor retaining bolts and save components

for installation of new compressor.

10. Using proper lifting techniques or devices, remove compres

sor from system.

Compressor mounting bolt torque is 65 to 75 in-lb (7.3 to

8.5 Nm).

COMPRESSOR ROTATION
On 3-phase units with scroll compressors, it is important to be cer

tain compressor is rotating in the proper direction. To determine

whether or not compressor is rotating in the proper direction:

1. Connect service gages to suction and discharge pressure

fittings.

2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure

should rise, as is normal on any start-up.

NOTE: If the suction pressure does not drop and the discharge

pressure does not rise to normal levels:

4. Note that the evaporator fan is probably also rotating in the

wrong direction.

5. Turn off power to the unit.
6. Reverse any two of the unit power leads.
7. Reapply power to the compressor.
The suction and discharge pressure levels should now move to

their normal start-up levels.

NOTE: When the compressor is rotating in the wrong direction,

the unit makes an elevated level of noise and does not provide

cooling.

Filter Drier

Replace whenever refrigerant system is exposed to atmosphere.

Only use factory specified liquid-line filter driers with working

pressures no less than 650 psig. Do not install a suction-line filter

drier in liquid line. A liquid-line filter drier designed for use with

Puron (R-410A) refrigerant is required on every unit.

Condenser-Fan Adjustment

1. Shut off unit power supply. Install lockout tag.

2. Remove condenser-fan assembly (grille, motor, and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 14.
5. Tighten setscrews to 84 in-lb (9.5 Nm).
6. Replace condenser-fan assembly.

Fig. 14 — Condenser Fan Adjustment

CONVENIENCE OUTLETS

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in damage to

components.

The compressor is in a R-410A refrigerant system and uses a

polyolester (POE) oil. This oil is extremely hygroscopic,

meaning it absorbs water readily. POE oils can absorb

15 times as much water as other oils designed for HCFC and

CFC refrigerants. Avoid exposure of the oil to the atmosphere.

WARNING