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Question About Ducane (HVAC) Heat Pump 2HP13
DUCANE HEAT PUMP HP12B30...

UNIT RUNS FINE IN COOLING MODE , BUT FROSTS UP IN HEATING MODE EVEN WHEN THE TEMPATURE IS ABOVE 50 DEGREES. NOT SURE IF ITS THE REVERSING VALVE OR THE EXPANSION VALVE ON THE HEAT PUMP

Asked by RUSTY on 05/08/2010 4  Answers

ManualsOnline posted an answer 14 years, 6 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

Scott Buehler posted an answer 14 years, 6 months ago

4 The outdoor unit can frost up under normal operating conditions. the defrost control should take care of this every 30, 60, or 90 minutes. If it ices up then the defrost control would be suspect. In heating mode is the larger of the two lineset pipes hot? measure the temperature across the indoor coil it should be 25-30 degrees temp change with no electric heat. Go to Sporlan expansion valve website for txv diagnostics and reversing valves.
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Scott Buehler posted an answer 14 years, 6 months ago

3 the frosting occurs when refrigerant is flashing, or going from liquid to vapor. It could indicate a restriction, the expansion valve may not be feeding correctly, or low refrigerant charge. Where is the frosting occuring?
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RUSTY posted an answer 14 years, 6 months ago

0 charged system in cooling mode , prior to the condenser frosting up in heating mode . is there any way to find out wether there is a problem with the expansion valve in the condensing unit or possibly the reversing valve isn;t opening all the way ?
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