Heat pump operation - http://www.hvacmechanic.com/ Forums
Original message
| gebby42
 |  "Heat pump operation"
, posted Thu 17 Nov 19:39  
I am really confused on my first experience with a heat pump. It is 20 degrees outside, therm set on 68 degrees. The blower on the unit continues to run. I have it on "norm". If I turn the therm up the aux light comes on and warm air blows. If I put it on em heat I get cool air. I thought the em heat was the electric furnace but all it did was cool the house down. Why would I get warm air when it is in norm but not on em heat? On norm the unit outside continues to run as well but not on em heat. I have a 3000 sq ft house and I am wondering if the heat pump will heat the house, in Ohio yet to boot....
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Replies:
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| tecman
| "Re(1):Heat pump operation" , posted Fri 18 Nov 19:51
Sounds like a thermostat wiring problem to me. Should be nice and warm in Em Heat. I suspect that the E terminal is not connected at the stat. Usually it gets jumpered to the W terminal.
You shouldn't be confused, something is not right.
paul
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| henrytitus
| "Re(1):Heat pump operation" , posted Fri 18 Nov 18:12
When you switch to emergency heat only the strips are heating and not supplementing the outdoor unit which is why the air from the vents is cooler.
Emergency heat is only used if the outdoor unit is malfunctioning or not functioning at all and is very expensive to run.
Some thermostats are wired to display a light when electric strips come on, strips will activate if you raise thermostat by 2 degrees or more until thermostat satisfies.
Henry
This may work or maybe not
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| scottandgia
| "Re(1):Heat pump operation" , posted Fri 18 Nov 05:53
I supervise a community with 128 heat pump systems. Heat pumps can be deceiving. They blow at a higher rpm, which makes it feel as if it is blowing cooler air. Check your actual temp inside to see if it is reaching the requested temp you are needing in your home. When you have your heat pump running, does your high pressure side (the small line) feel hot or cold?. If your large line is cold, and so is your large line, it seems like it could be a reversing valve on your outside unit thats defective. Also, keep in mind that heat pumps are made more for moderate weather conditions above 30 degrees. If it cannot keep up, it should run the supplemental heat as well.
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| shank
| "Re(1):Heat pump operation" , posted Thu 17 Nov 21:20
When you were trying it in Em Ht was the aux light on also, or no?
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| | gebby42
| "Re(2):Heat pump operation" , posted Mon 21 Nov 06:06
When I did try the em heat the aux light came on when I turned the t-stat up. I took it off em heat as a local heat and air guy told me to use that only if the outside unit is not working (which it is, I think)
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| cantdorite
| "Re(1):Heat pump operation" , posted Thu 17 Nov 19:54
some thing i read about co-efficient of preformance, might be to cold outsibe and your strip heat is kicking in on the emergency heat mode.aux and emer heat i think would be the strip heat. there might be 2 stages of electric strip heat?
ekb
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| mastertech
| "Re(1):Heat pump operation" , posted Thu 17 Nov 19:53
No it doesnt sound right. Did u leave it on long enough. Some units divide out the emergency heat aux heat. But most just wire it all together. Have u changed out the T-stat lately?
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| | gebby42
| "Re(2):Heat pump operation" , posted Mon 21 Nov 06:09
I have not changed the t-stat. I called a local heat and air guy and he said I should only use the em heat if the other has a problem. He told me it sounds as if the unit is running correctly. Told me the outside unit at times will appear as steam coming out and condensation dripping, which it has down. He said it is in the defrost mode when it does this. I just worried because the blower on the furnace runs quite a bit.
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