Checking Compressor Efficiency; Non-Condensable; Compressor Burnout - Daikin DX17VSS B Series Service Instructions Manual

SERVICING
S-104 CHECKING COMPRESSOR EFFICIENCY
the reason for compressor inefficiency is that the compres-
sor is broken or damaged, reducing the ability of the com-
pressor to pump refrigerant vapor.
the condition of the compressor is checked in the following
manner.
1. Attach gauges to the high and low side of the system.
2. Start the system and run CHARGE ModE.
if the test shows:
a. Below normal high side pressure.
b. Above normal low side pressure.
c. Low temperature difference across coil.
d. Low amp draw at compressor.
And the charge is correct. the compressor is faulty - re-
place the compressor.
S-114 NON-CONDENSABLE
if non-condensable is suspected, shut down the system
and allow the pressures to equalize. Wait at least 15 min-
utes. Compare the pressure to the temperature of the cold-
est coil since this is where most of the refrigerant will be. if
the pressure indicates a higher temperature than that of the
coil temperature, non-condensable is present.
non-condensable is removed from the system by first re-
moving the refrigerant charge, replacing and/or installing
liquid line drier, evacuating and recharging.
S-115 COMPRESSOR BURNOUT
When a compressor burns out, high temperature develops
causing the refrigerant, oil and motor insulation to decom-
pose forming acids and sludge.
if a compressor is suspected of being burned-out, attach a
refrigerant hose to the liquid line dill valve and properly re-
move and dispose of the refrigerant.
NOTICE
Violation of EPA regulations may result in fines
or other penalties.
now determine if a burn out has actually occurred. Confirm
by analyzing an oil sample using an oil acid test kit.
Remove the compressor and obtain an oil sample from the
gas stub. if the oil is not acidic, either a burnout has not
occurred or the burnout is so mild that a complete clean-up
is not necessary.
if acid level is unacceptable, the system must be cleaned
by using the clean-up drier method.
CAUTION
Do not allow the sludge or oil to contact the skin.
Severe burns may result.
NOTE: the flushing Method using R-11 refrigerant is no
longer approved.
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