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QUEST 100
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
QUESTCLIMATE.COM
(877) 420-1330
11. Using capacitor or MFD setting on meter test between both capacitor terminals. Compare reading to
capacitor spec on capacitor.
12. If the above test pass but the compressor does not work, the compressor has an internal mechanical
defect and must be replaced.
7.6B REPLACING A BURNT COMPRESSOR
The refrigerant and oil mixture in a compressor is chemically very stable under normal operating conditions.
However, when an electrical short occurs in the compressor motor, the resulting high temperature arc causes
a portion of the refrigerant oil mixture to break down into carbonaceous sludge, a very corrosive acid, and
water. These contaminants must be carefully removed otherwise even small residues will attack replacement
compressor motors and cause failures.
The following procedure is effective only if the system is monitored after replacing the compressor to insure
that the clean up was complete.
1. This procedure assumes that the previously listed compressor motor circuit tests revealed a shorted or
open winding.
2. Remove and properly dispose of the system charge. DO NOT vent the refrigerant or allow it to contact your
eyes or skin.
3. Remove the burned out compressor. Use rubber gloves if there is any possibility of contacting the oil or sludge.
4. To facilitate subsequent steps, determine the type of burn out that occurred. If the discharge line shows no
evidence of sludge and the suction line is also clean or perhaps has some light carbon deposits, the burn out
occurred while the compressor was not rotating. Contaminants are therefore largely confined to the compressor
housing. A single installation of liquid and suction line filter/driers will probably clean up the system.
If sludge is evident in the discharge line, it will likely be found in the suction line. This indicates the compressor
burned out will running. Sludge and acid have been pumped throughout the system. Several changes of the
liquid and suction filter/driers will probably be necessary to cleanse the system.
5. Correct the system fault that caused the burn out. Consult the factory for advice.
6. Install the replacement compressor with a new capacitor and an oversized liquid line filter.
In a running burn out, install an oversized suction line filter/drier between the accumulator and compressor.
Thoroughly flush the accumulator with refrigerant to remove all trapped sludge and to prevent the oil hole
from becoming plugged. A standing burn out does not require a suction line filter/drier.
7. Evacuate the system with a good vacuum pump and accurate vacuum gauge. Leave the pump on the system
for at least an hour.
8. Operate the system for a short period of time, monitoring the suction pressure to determine that the suction
filter is not becoming plugged. Replace the suction filter/drier if pressure drop occurs. If a severe running burn
out has occurred, several filter/driers may have to be replaced to remove all of the acid and moisture.
NOTE: NEVER USE THE COMPRESSOR TO EVACUATE THE SYSTEM OR ANY PART OF IT.
7.6C REPLACING A COMPRESSOR, NON BURN OUT
Remove the refrigerant from the system. Replace the compressor and liquid line filter/drier. Charge the
system to 50 PSIG and check for leaks. Remove the charge and weigh in the refrigerant quantity listed on the
nameplate. Operate the system to verify performance.
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