Cause of high pressure in heat pump heating.

[hvacvegas]

Nameplate isn't for approved coil, it's for the "most commonly used coil".

Just like DOE ratings on equiptment.

[Heatpump1$]

After sharing the operating data with the Frigidaire tech he advised to pull charge. The install is two years old and an approved combination. Pressures still are a little high but unit has 28 degree td and has been running since. Temp across drier is good. The strange part is that the unit was under charged by 5 # and the high pressure occurred sooner.

[gasser65]

Tstat isn't wired wrong so strip heat runs at the same time as the heat pump, right? I just fixed one that had been there for ten years with that problem. Customer had been told the HP switch was a safety feature and just reset it if it tripped - it tripped in heat mode almost everyday since it was installed.

[hvacvegas]

Tstat isn't wired wrong so strip heat runs at the same time as the heat pump, right? I just fixed one that had been there for ten years with that problem. Customer had been told the HP switch was a safety feature and just reset it if it tripped - it tripped in heat mode almost everyday since it was installed.

Thats gotta be a downflow right?

[gasser65]

No, upflow. Wierd I know, but it fixed it in this case.