Quote:
Originally Posted by Scubawise
Hi Do all heat pumps not work if temp below 40?
|
With roof mounted RV heat pumps the answer is YES, as they do not contain the circuitry to defrost the heat pump's evaporator coil. A house type heat pump contains a electric heat coil to provide heat to the room while the heat pump defrost the evaporator's coil. Typically the evaporator coil runs 12 or 20 degrees colder than the atmospheric temperature (you gotta get heat from somewhere). At 40 degrees frost will begin form on the evaporator's coil shutoff air flow. My 3 ton house heat pump requites 45 amps at 240 volts during the defrost cycle or 4 times the current required in the A/C cycle or normal heat pump cycle. Few RV coaches have the capability to supply 50 amps @ 120 volts to power a roof heat pump's defrost cycle.
Thor Forums
