Emerson 3000/ITR Manuel D’Utilisation

Risk of improper compressor lubrication. Can cause compressor and refrigerant system 

damage.
Failure to use oil types, viscosities and quantities recommended by the compressor 

manufacturer may reduce compressor life and void the compressor warranty. See oil types 

specified in Table 10. 

• Do NOT mix polyol ester (POE) and mineral-based oils.
• Do NOT mix oils of different viscosities.

Consult Emerson or the compressor manufacturer if you have questions.

1. Use Copeland POE Oil ULTRA 22CC, Mobil EAL Arctic 22CC or other Copeland-approved oils.

Replacement compressors are available through your local Emerson office. Compressors are shipped 

in reusable packaging. If unit is under warranty, complete and include Liebert Service Credit Appli-

cation (LSCA) with the compressor that is being returned. The original compressor should be 

returned in the same packaging.

Be certain that the compressor is actually defective. At a minimum, recheck a compressor returned 

from the field in the shop or depot for Hipot, winding resistance and ability to start before returning 

it. More than one-third of compressors returned for warranty analysis are determined to have nothing 

wrong. They were misdiagnosed in the field as being defective. Replacing working compressors unnec-

essarily costs everyone.

The following diagnostic procedure should be used to evaluate whether the compressor is working 

properly.
1. Proper voltage to the unit should be verified.
2. The normal checks of motor winding continuity and short to ground should be made to determine 

if the inherent overload motor protector has opened or if an internal motor short or ground fault 

has developed. If the protector has opened, the compressor must be allowed to cool sufficiently to 

allow it to reset.

3. Proper indoor and outdoor blower/fan operation should be verified. Condenser glycol flow should 

be verified.

4. With service gauges connected to suction and discharge pressure fittings, turn On the compressor. 

If suction pressure falls below normal levels, either the system charge is low on or there is a flow 

blockage in the system.

5. If suction pressure does not drop and discharge pressure does not rise to normal levels, reverse 

any two of the compressor power leads and reapply power to make sure compressor was not wired 

to run in reverse direction. If pressures still do not move to normal values, system is properly 

charged and solenoid valves function, the compressor is faulty. Reconnect the compressor leads as 

originally configured and use normal diagnostic procedures to check operation of the reversing 

valve.

6. To test if the compressor is pumping properly, the compressor current draw must be compared to 

published compressor performance curves using the operating pressures and voltage of the 

system. If the measured average current deviates more than ±15% from published values, a faulty 

compressor may be indicated. A current imbalance exceeding 15% of the average on the three 

phases should be investigated further.

Copeland Scroll

and Digital Scroll

POE Oil - ISO 22 

Viscosity