Setting up Dual-Fuel Heat Pump for maximum ef - http://www.hvacmechanic.com/ Forums
Original message
| Hamons
 |  "Setting up Dual-Fuel Heat Pump for maximum ef"
, posted Mon 24 Oct 13:34  
WOW - this is agreat site. Wish I would have known about this site 3 mos ago when I was researchign and bought a new system for my home. Although I think I would have made the same choice -- it would have been easier.
I wanted your help to see if I everything is setup for maximum efficiency.
The system is Bryant Dual Fuel Heat Pump System
Bryant 80% 2 stage 312aav Furnace and 13 SEER Bryant 650A Heat Pump controlled by Honeywell 8320 Thermostat.
My queestion is how should I se evenign set abck for max efficiency. I have never had a heat pump before and would assume that cooling off the house too much wills tart to harm the cost savings.
Is there a way to setup thermostat so mornign warm up happens with furnace and then temp is maintained with HP?
What temperature should the thermostats balance pointbe set too to go from electric to gas?
Any other pointers you suggest in using HP system
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Replies:
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| Xenos
| "Re(1):Setting up Dual-Fuel Heat Pump for maxi" , posted Mon 24 Oct 19:57
The balance point is different with every home. However the lowest point you can get to without the unit going into a defrost is where the maximum savings are. I wouldn’t be too concerned with using the Gas for morning warm up. You could do it with relays but it should be fine with out it. I'm asuming your using the out door sensor and holding off the gas to a predetermined point.
Xenos.
The best way to escape a problem is to solve it.
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| Freon
| "Re(1):Setting up Dual-Fuel Heat Pump for maxi" , posted Mon 24 Oct 14:00:
You may want to ask these questions from the HVAC company that installed the system. They should know for your climate where the various settings should be. Usually if you have a significant setback at night, then the gas furnace will be on first thing due to the temperature difference between the morning/day set temp and the night set temp. So if you have a 72 day temp set at 6AM and a 65 night temp set at 11PM, then the difference is 7 degrees and the furnace normally will be on at 7AM along with the heat pump (outdoor temp >~35). I'd allow at least an hour of heating before you have to get out of bed. As the house heats up to less that 2 degrees (usually, but adjustable) of the set temp (72) then usually the furnace will stop and the heat pump will be the only source. The balance point is something the HVAC company should know for your location. Generally, a heat pump becomes less effective around 35 degrees outdoor temp.
[this message was edited by Freon on Mon 24 Oct 14:01] |
| | hamons
| "Re(2):Setting up Dual-Fuel Heat Pump for maxi" , posted Tue 25 Oct 17:51
The Vision Pro 8320 T-stat I use will decide when to turn the heat pump on to make sure it is warmed up by wake time -- pretty cool.
The company who installed it said they use the Vison Pro default of 30 degrees. I wanted a more precise setting -- than just using the default.
I think what I will do is st the change-over to 20 degrees and monitor at what temp the heat pump can no longer keep with the heat load and make that the balance point. With my very cheap electricity rate -- I want to maximize use of the heat pump!
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