Trane heat pump lockouts

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Old 12-09-14, 11:04 AM
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Trane heat pump lockouts

I live in Vancouver,BC and have a 1.5 ton Trane XL13c all electric heat pump.
I also have the Trane XL 950 thermostat with outdoor sensor. We recently had 2 cold snaps, with temps of 15-20F.
There are 2 bayhtr heat strip backups as well. One of them is 30 amps (105e) and the other is 40 amps (108e).
I am hoping to get more low temperature use out of my heat pump so as to use the heat strips as little as possible.
My questions are, what settings for heat pump lockout? Auxilliary heat lockout?
Any suggestions?

I thank you for any replies I get.
 
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Old 12-09-14, 12:54 PM
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With electric backup heat you should not need to lock out backup heat. It will run during defrost and if the heat pump can't keep up it will kick on when the indoor temp falls 2 degrees below the set point. Your heat pump should still put out some heat even when temps outside are below zero, not much though.
 
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Old 12-09-14, 03:23 PM
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Thank you

I am so very new to this.
Some forums said to lock out the compressor at 35 F.
I was wondering if this is wise......
Thank you for taking the time to reply.
 
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Old 12-10-14, 07:58 AM
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In the Vancouver climate you should never have to "lock out" the heat pump .
One wonders where the 35F figure comes from, certainly not from the manufacturers who are willing to claim effective heat pumping down to 0F +- which matches my experience in the Boston area.
 
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Old 12-10-14, 08:20 AM
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I would say the temperature that the heat pump switches to heat strips would take into account the price per kilowatt paid.
 
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Old 12-10-14, 08:30 AM
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The installer told me that's below 40F, heat pumps don't put out much heat.
So he set the heat strips to kick in below 40F. When I had my electric bill, it was $300.
I have been wanting to set the heat strips to kick in at a lower temperature than 40F.
What temperature would you suggest to set the Auxilliary heat to kick in at?
Again, thank you
 
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Old 12-10-14, 02:51 PM
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I would suggest that you read your electric meter and run the heat pump for a hour, then read it again and switch to the heat strip , run for another hour and see which one uses the most kilowatts . Turn all unnecessary users of power off for this test . This test could be used as the outside temperature goes below the 40f .
 
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Old 12-11-14, 02:12 PM
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Why not lower the AUX heat point to 30F and see if it's still comfortable ... etc.

Is the $300 bill for one month or two ... doesn't BC hydro have a two month billing cycle ?

A 1.5 ton heatpump would indicate a relatively small ( maybe 800 sqft?) or very well insulated dwelling ? If so, $300/month seems a lot for your climate and low electric rates - while $150 /month seems pretty easy to take
 
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Old 12-11-14, 07:40 PM
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Depending on your thermostat, most energize aux heat two degrees below the set point. You might want to set the stat to em heat during freezing rain so ice build up on the hp fan blades doesn't destroy the unit, or if you notice the stat is staying two degrees or more below set point.
 
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Old 12-11-14, 07:48 PM
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I will set Auxilliary heat to 30F. Yes, the space is small.
This is exactly the information I was looking for and I thank you both dsomerv and ksefan.
I am very glad for all the help all of you have given me.
No one, at my end would or could respond to my questions......
 
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