Original message
| groupie02
 |  "shutting down HP when elec furnace is running"
, posted Mon 25 Feb 14:34  
We used to have a Lennox heat pump with a Lennox electric furnace. We replaced our 20 year old Lennox thermostat with a Honeywell RTH8500D. Everything was working fine until the HP died on us.
The HP was replaced and the coils had to be moved from under the furnace elements to above the elements. Now, we had to have the thermostat replaced because we could not get the heat pump to be turned off by the thermostat when the furnace was running.
I really miss my 8500 and wish I could figure out a way to have it turn off the heat pump when the furnace starts.
Can you help?
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Replies:
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| knightofthebass
| "Re(1):shutting down HP when elec furnace is r" , posted Thu 28 Feb 14:00
I charge $50 for a service call, which includes up to the first hour.
Cool Squad
(949)235-1095
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| theduke03
| "Re(1):shutting down HP when elec furnace is r" , posted Mon 25 Feb 17:24
If your coil is above your electric elements and your system is not a downflow, then it is wrong. Sometimes both should be running at the same time but not if the coil is after the elements. That will put an excessive load on your system. Also have you tried emergency heat? That will run electric only and not HP. If your new stat does not have an Em. heat setting, then I would replace it with one that does.
You can't put a price on comfort! Be Safe.
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| | groupie02
|  "Re(2):shutting down HP when elec furnace is r"
, posted Tue 26 Feb 10:20
quote:
If your coil is above your electric elements and your system is not a downflow, then it is wrong.
...
Thanks for the info. I guess our contractor decided to put the coil above the elements because it didn't fit where the old one was. This allowed THEM to save money by not getting the right part for our furnace. :(
The emergency/aux heat works fine now with our new crappy thermostat. And that one does stop the HP when the electric elements are in use. I just wish I could do that with my 8 month old RTH8500D.
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