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Old 12-20-2008, 10:13 PM   #1
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Backup heat only switchover


Hi, I live in Montreal, Quebec, Canada, and here people who has an heat pump and oil backup can get a better eletricity price, above -12 celsius. Below that point, electricity cost a LOT more.

I have 2 wires coming from that system, normally closed (above -12 celsius), and open (below -12 celsius). I use them to control my "Y" heat pump wire. It works great. My heat pump will never work below -12.

The problem is that, below -12, my thermostat (Carrier TSTATCCSAC01) will energize the "Y" wire for heat (has no effect, open circuit) , wait 15 minutes, then energize the "W" (oil backup). During these 15 minutes, it's getting cold in the house ! I must manually set the the thermostat to "Emergency heat" to counter this behavior.

How can I tell the thermostat to go directly in oil backup when below -12 ?

Thanks for the help !

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Old 12-21-2008, 04:15 AM   #2
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Backup heat only switchover


Uou can add an external dual fuel control, that will automatically switch over and use the oil furnace without having to wait for the temp to drop.

Or get a thermostat that is a dual fuel control that will automatically switch over to the oil furnace without having to wait for the temp to drop.

Carrier, Honeywell, and WhiteRodgers all make them.

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