Question about Hitachi RAS-09UH Air Conditioner

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Outdoor unit will not run

Its 22 F outside I have a outdoor Infinity that will not run .The indoor is fine Its a fish store with lotsa great stuff but need cooling 'Its a 4 ton unit its been fine when temps are 28 to 32 help or I'll be eating lots

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  • Stephen Evans May 11, 2010

    have you check the fuses?circuit breaker?

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Running an air conditioner in the winter.
Generally they have a low pressure switch on them that won't allow it to run when the pressure falls below about 60 psig, at 22° F refrigerant R22 pressure is about 45 psig.
So to run it at that temperature you will have to disconnect your low pressure switch and install a jumper wire across those terminals and install a low ambient fan cycling switch kit (that you can get at your local ac parts house) which will keep the head pressure up when unit is running.
But by bypassing the low pressure switch you won't have any protection if you have a refrigerant leak or your indoor blower fails
or filter or evaporator gets dirty or plugged up.

Posted on Apr 10, 2009

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Some air conditioners have a thermostat that will not allow the compressor to run below a certain out side tempature as it will cause liquit to come back into the compressor(called slugging) and damage or destroy it.  

http://www.hitachi.com.au/productsearch.aspx?pId=62&

Posted on Jan 08, 2009

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