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

Originally Posted by 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.

Thats gotta be a downflow right?

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.

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.

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

Just like DOE ratings on equiptment.

Is this a newer heat pump installed on an existing coil if so charging by weight on nameplate would probably be slightly overcharged. If you have checked temp across drier and indoor coil for cleanliness already than I would say outdoor TXV

This installation is using an approved coil and I did not ad extra for the 35 foot lineset.

Originally Posted by Heatpump1$

I pulled 1.5# of charge out and this seems to have everything working good. First time I have overcharged by weighing at name plate. Every brand has their own quirks. Thank you everyone on your responses.

Nameplate charge means nothing unless you have the tested coil and line set, unless it is a package unit

I pulled 1.5# of charge out and this seems to have everything working good. First time I have overcharged by weighing at name plate. Every brand has their own quirks. Thank you everyone on your responses.

to daniel87829,
what is ymmv? Thanks

The unit was under charged upon first visit and it would trip sooner than with full charge. Suction pressure with correct charge stayed fairly constant but head pressure steadly climbed. Opening up tx only seemed to delay the high pressure trip. There was no pressure difference across the filter drier.

Originally Posted by Heatpump1$

Hello All,
Having an issue with a heat pump running at high discharge temp and pressure and tripping on high pressure. I pulled charge and weighed it back in. Was low on charge which was caused by a poor service port gasket. Unit runs a little longer and trips on high pressure. Filters good, coil clean, charge good. Suspect outdoor unit txv. Any input would be greatly appreciated.

Whats you suction pressures at before it trips? Is there a charge chart on the panel of this unit that shows the pressures? Have seen many heat pumps that were weighed in be overcharged in heat mode.

Is there a filter drier? could the installer have allowed gunk/solder to block a line? During install over heated line overheating valve?
Possible metering device clog/ malf.
Maybe do temp check at discharge before port, after port, or maybe on line setup to metering device
Top of head thought ymmv
Sent from my LGL35G using Tapatalk 2

Had a look and it is clean.

Make sure the indoor coil is clean.

Frigidaire FT4BF-060k

model numbers.

Cause of high pressure in heat pump heating.

Hello All,
Having an issue with a heat pump running at high discharge temp and pressure and tripping on high pressure. I pulled charge and weighed it back in. Was low on charge which was caused by a poor service port gasket. Unit runs a little longer and trips on high pressure. Filters good, coil clean, charge good. Suspect outdoor unit txv. Any input would be greatly appreciated.