6 720 220 047
Revised 03-11 Subject to change without prior notice
21
TW Series / Water to Water
Troubleshooting
Unit short
cycles
Unit oversized Recalculate heating and or cooling loads.
Wiring and controls Loose connections in the wiring or a defective compressor contactor.
Fluid Volume Inadequate load side uid volume.
Insufcient
cooling or
heating
Unit undersized Recalculate heating and or cooling loads. If excessive, possibly adding
insulation and shading will rectify the problem. Unit may be short of
refrigerant.
Refrigerant charge Unit may be short on refrigerant charge.
Compressor Check for defective compressor. If discharge is too low and suction
pressure is too high, compressor is not pumping properly. Replace
compressor.
Reversing valve Defective reversing valve creating bypass of refrigerant from discharge
to suction side of compressor. Replace reversing valve.
Operating pres-
sures
Compare unit operating pressures to the pressure / temperature chart
for the unit.
TXV Check TXV for possible restriction or defect. Replace if necessary
Moisture, noncon-
densables
The refrigerant system may be contaminated with moisture or noncon-
densables. Reclaim refrigerant, evacuate and recharge with factory
recommended charge. Note: a liquid line dryer may be required
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