Can I change heat pump switch over temperature ?

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Old 12-10-14, 11:48 AM
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Can I change heat pump switch over temperature ?

I have a dual fuel electric/propane heat pump about 3 years old. The installer set the switch over temp to 40 degrees. He said they usually set them at 35, but since we were new to heat pumps (coming from a propane furnace) he recommended 40.

Due to astronomical propane prices, I'd like to try a 35 switchover. Is this something a homeowner can change?
 
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Old 12-10-14, 12:03 PM
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What's the model number on the heat pump. Might be something you can change.

BTW I would set it as low as 20*.
 
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Old 12-10-14, 12:16 PM
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Thanks for the reply. It is a 3.5 Ton York. The numbers I see on the installation invoice are:
HP - YHJF42S41S1
COIL - FC64D3XN1
FURNACE - TM9X100C16MP11
 
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Old 12-10-14, 12:43 PM
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I believe the lockout temperature is set in the thermostat and the thermostat would be using a remote temperature sensor for outside temperature.

Can you post the make and model of the thermostat ?
 
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Old 12-10-14, 01:09 PM
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It's a Honeywell th8320u1008.

I've looked through the manual and can't find anything, but maybe it's a super secret non-consumer setting.
 
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Old 12-10-14, 01:20 PM
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It's a setting in that thermostat set by the installer. In the link below is the setup instructions. I see several sections discussing lockout temperatures. I'm not exactly sure which one you should change. Houston, the forum pro, will stop by and leave you the programming changes.

customer.honeywell/TechLit.pdf

steps 350/360 are the degree settings.
 
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