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04-06-2014, 11:11 PM #1
Why does one outdoor fan shut off in heat cycle?
I have two Hitachi 5T heat pumps. Each outdoor unit has two fans. One of these is controlled by a pressure switch and shuts off at times. Why is this? I would think the unit needs all the air possible in order to extract as much heat as possible. Note that this is not the defrost mode when both fans stop.
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04-06-2014, 11:23 PM #2
Re: Why does one outdoor fan shut off in heat cycle?
Don't know about the specifics of a Hitachi but older Fujitsu's I seem to recall would do it so as to control the temperature of the indoor coil. If indoor coil was getting too hot (over 60*C roughly) outdoor fan would slow down to reduce capacity then stop if coil temp got to a certain level.
Cheers,
Andy.Health and safety first..........unless I'm in a hurry.
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05-06-2014, 03:41 PM #3
Re: Why does one outdoor fan shut off in heat cycle?
In this case there is no temperature sensor on the indoor coil. The fan is controlled by a pressure switch on the refrigerant line. I'm not sure if it on the high or low side. I cannot see any reason to shut down one fan except for defrost, when both stop.
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06-06-2014, 10:00 PM #4