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Heat Pump Installation and User’s Guide
Problemor Symptoms Possible Cause Corrective Action
Higher than Normal Head Pressure,
than normal suction pressure with high
superheat and very cold or frosty distribu-
tor tubes, may have noAlarm
TXV stuck closed. 1. Disconnect TXV bulb fromsuction line (SL), have it in your
hand, if pressures go back to normal, then reinstall the bulb
on suction line (it may have some debris stuck in the port).
For adjustable TXVs open adjustable valve, it may remove
the debris and set it back to original position. 2. If (1) does
not work, recover the charge, remove bulb fromSL, unscrew
TXV head, shake it, if rattles, replace head (PN KT-45-ZGA),
if not, replace TXV and filter dryer and charge appropriately.
Lower than Normal Head Pressure,
higher than normal suction pressure with
cold suction line and compressor and no
superheat, may have noAlarm.
TXV stuck open.
1.
Check to see if TXV bulb is firmly attached
to suction line, if loose, attach firmly by tighten-
ing the clamp over the bulb and suction line.
2.
If (1) above does not work, reclaimcharge and replace
TXV and filter dryer with nameplate charge.
Unusually higher than normal current.
TXV stuck closed/partially closed, insufficient
water flow, systemovercharged.
See Possible Cause column for: TXV stuck closed, Insuf-
ficient water flow, and Unit overcharged.
Low current with high superheat. Unit undercharged.
Find source of refrigerant leak and fix. Pull vacuumand
Unit runs, but breaker trips continuously. Electrical issue. Contact certified electrician.
Problems and Corrective Action (3 Phase Units Only)
Unable to turn Heat Pump ON. Display is
Blank. Unit will NOT start.
Incorrect Wiring.
Check the Light on Phase Monitor inside the electrical box.
If red, switch two of the Input wires. Any two of the three can
be switched.
Faulty Phase Monitor.
Call dealer or factory for advice before attempting to
parts. Replace Phase Monitor.
Loose wire on Phase Monitor, either fromthe
supply input power or the output side.
Check the Light on Phase Monitor inside the electrical box.
If the Light is Red, fix the supply power loose end. If the
Light is green, fix the output loose wire.
Compressor making a loud or unusual
noise or sounds during operation. Fan is
turning, no cool air discharge out of top of
heater. Unit ON, and Set Temperature is
aboveActual, but Unit is not heating.
Compressor running Backwards. This usually
happens if the compressor wire harness is dis-
connected for possible repair or replacement.
Switch any two of the three wires on the compressor side of
the Contactor.
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