Defrost Coil Temps are High
- York 2 stage 3 ton heat pump
- York 80% Modulating furnace
- VisionPro IAQ tstat
I tend to be a bit anal in my data collection. I monitor most aspects of my heat pump (hp); hp off/fossil fuel on, defrost cycles and temps, etc. That said, I've had 4 new controller boards put in my hp since purchased 2 years ago; the latest one was 10 days ago. I've notice a change in the temp of the outside coils during defrost. Typically the coils reached 80 or 90 degrees during defrost. Now they are reaching 110 to 125 degrees.
Is this normal? What triggers the end to a defrost cycle.
A little more detail about my heat pump:
The four controller boards I spoke of have been replaced for various reasons. The most recent was because I detected the hp was shutting off three times an hour and the fossil fuel was kicking in. According to York, once the fossil fuel is energized, it should not shut off until the demand by the thermostat has been satisfied. The tech was able to duplicate my findings and he replaced the controller board in hopes of rectifying the problem.
My observations of the outside coil temps is a new issue. I have data going back two years and I have never recorded coil temp this high however, I don't know if this is in the normal range of operation.