Heat Pump: Coleman Model HC8B024F4C
Air Handler: Model AHV24B3XH2IC
Thermo: Honeywell VisionPro 8001
House: 1800 sq ft
System installed Nov 2014
State: Washington
Daily set point temp 0530 to 2100 - 68F
Night set point 2100 - 0530 - 63F
Observations:
We see a very consistent pattern of cycling in the morning:
The house comes up to 68 at 0530 with out issue (the thermostat starts the process in time for the house to be at 68F at 0530, works great). This typically takes around 1-1.5 hours. Unit shuts off for 5-7 minutes, then comes on again for 45 minutes to 3 hours, shuts off for 5-7 minutes, then comes on again for 35 minutes to 1.5 hours. The actual duration of the run times are, as you might expect, closely tied to outside temperature but the pattern persists across temperature ranges. After the unit completes the last of these two"extra" cycles it settles into a pattern which I feel is more consistent with maintaining the set point. During this set point maintenance cycling we never see a run time duration as long as even the shortest "extra" one in the morning.
We feel this pattern has occurred since install. To confirm our suspicions I started logging system operations with a data logger about three weeks ago. Our dealer seems unable to explain what is happening during these two "extra" cycles. ("It's a computer thing, too complex to understand.") Right!
Temperature info during logging period:
Outside temperatures at 0500 have averaged about 40F.
The daily mean temperature has been about 45F.
My questions:
In particular I wonder why after bringing the house to the set point at 0530 the unit doesn't immediately go into a cycling pattern to maintain that temperature? Why these two "extra" cycles in the morning?
If anyone can enlighten me I would be grateful.
Wayne
Air Handler: Model AHV24B3XH2IC
Thermo: Honeywell VisionPro 8001
House: 1800 sq ft
System installed Nov 2014
State: Washington
Daily set point temp 0530 to 2100 - 68F
Night set point 2100 - 0530 - 63F
Observations:
We see a very consistent pattern of cycling in the morning:
The house comes up to 68 at 0530 with out issue (the thermostat starts the process in time for the house to be at 68F at 0530, works great). This typically takes around 1-1.5 hours. Unit shuts off for 5-7 minutes, then comes on again for 45 minutes to 3 hours, shuts off for 5-7 minutes, then comes on again for 35 minutes to 1.5 hours. The actual duration of the run times are, as you might expect, closely tied to outside temperature but the pattern persists across temperature ranges. After the unit completes the last of these two"extra" cycles it settles into a pattern which I feel is more consistent with maintaining the set point. During this set point maintenance cycling we never see a run time duration as long as even the shortest "extra" one in the morning.
We feel this pattern has occurred since install. To confirm our suspicions I started logging system operations with a data logger about three weeks ago. Our dealer seems unable to explain what is happening during these two "extra" cycles. ("It's a computer thing, too complex to understand.") Right!
Temperature info during logging period:
Outside temperatures at 0500 have averaged about 40F.
The daily mean temperature has been about 45F.
My questions:
In particular I wonder why after bringing the house to the set point at 0530 the unit doesn't immediately go into a cycling pattern to maintain that temperature? Why these two "extra" cycles in the morning?
If anyone can enlighten me I would be grateful.
Wayne
Strange morning cycling pattern
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