help

[nathanscott44]

i need help. i recently installed a rheem 1.5t heat pump (r410a) for a customer and having cooling problems. the area is roughly about 400sqft with 9'ceilings. it was installed late fall of 2010. he called today and said that it wasnt cooling and the compressor/condenser fan was running constantly. during the day the coldest it would get is 87*. when arriving the suction pressure was about 124# (43* evap.) the ambient temp during teh hottest part of the day is around 95-99*. i had a good frost pattern on the evap and sweating on the txv. could it be low on freon and i just couldnt tell b/c the return air was 85*? i have been in the commercial refrigeration business for 10yrs but now getting into the residential heating and air. any help would be greatly appreciated. thanks in advance.

[VTP99]

[QUOTE=nathanscott44;10397032(43* evap.)i had a good frost pattern on the evap

How did you get frost on a 43* evaporator ?

[ChrisTechMech]

SC? CFM? Ret DB/WB & Dis DB? What type of space, garage, small apt (insulated well)? What type of heat? Electric or gas? I recently had a heat sequencer stuck closed and the A/C couldn't cool.

[D-Allen]

What was the subcooling?

[skippedover]

You should get your posts up so you can come join us on the pro side. If you're a refer tech we can give you a lot of help over there that we're unable to give in the public forums.

You need to verify airflow, determine the metering device, charge to SC for a TXV, SH for a piston. Compare your SC to SH. Any anomalies? Something isn't adding up with the suction temp and 'frost pattern' on the evap coil. We don't deal in frost patterns on an AC evaporator. This isn't a freezer.

[D-Allen]

I thought the same thing Skippedover, TXV= subcooling