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Old 11-15-2010, 04:38 PM   #1
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Mini-split heat pump R410A


I have a mini-split R410A heat pump and live in an area that will regularly see -20F in winter. The manual does not mention any type of low outdoor temperature cut off. Should I be concerned about this, can the unit be damaged at low outdoor temperatures. I would think it wouldn't produce any heat at those temps.

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Old 11-15-2010, 05:14 PM   #2
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Mini-split heat pump R410A


many can produce heat at -13.

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Old 11-15-2010, 05:28 PM   #3
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Mini-split heat pump R410A


Could the compressor or unit be damaged from trying to start at low temperatures. I am trying to figure out if this is a standard installation in cold climates or if a low outdoor temperature cut off kit is needed.
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Old 11-15-2010, 05:44 PM   #4
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Mini-split heat pump R410A


Its designed to start in cold temps. So no harm.
it will shut off when its own outdoor sensor says its too cold outside.
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Old 11-15-2010, 05:58 PM   #5
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Mini-split heat pump R410A


Ok thanks, since there was no information in the manual I thought it may not have an outdoor low temp sensor.
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Old 11-15-2010, 06:02 PM   #6
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Mini-split heat pump R410A


Varies with brand and model line.

Post brand and model number.
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Old 11-15-2010, 06:11 PM   #7
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Mini-split heat pump R410A


It's a Climette (Canadian mdl) 12J1A made by ICP, same as a Keeprite SX 13 seer.
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Old 11-15-2010, 06:19 PM   #8
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Mini-split heat pump R410A


Not familiar with that brand or model. If it list that it has demand defrost. it has its own outdoor temp sensor.
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Old 11-15-2010, 06:34 PM   #9
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Mini-split heat pump R410A


It definitely has a defrost cycle, not sure what type it is. Here is a link to the manuals.

http://www.climette.ca/Mini_Splits/Mini_Splits.htm

Appreciate all the help.
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Old 11-16-2010, 02:10 AM   #10
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On page 13. It list an outdoor temp sensor.

So you have one.Just can't tell what type of defrost it has. But probably an on demand defrost board.
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Old 11-16-2010, 06:44 AM   #11
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Mini-split heat pump R410A


I read that book ten times and did not pick up on that, That's where experience comes in. Thanks for the help.
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Old 11-17-2010, 04:00 PM   #12
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Mini-split heat pump R410A


beenthere, I contacted ICP and they confirm the unit can produce heat to 14F however it does not have a low temp cut out. They suggested I install an outdoor thermostat however they would not recommend one saying they are generic. The unit runs on 120Vac and there is an interconnect between the inside and outside unit of 4wire 18G. Do you have a type of thermostat you could recommend and would the 120v supply line be interrupted or one of the control wires. Thanks.
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Old 11-17-2010, 04:11 PM   #13
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Mini-split heat pump R410A


I don't use them. So don't know of anyone off hand.

You would wire it to open the power to the indoor unit. So the outdoor can stay powered, to keep the compressor warm if it has a crank case heater.

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