Just got through with a service call on a Goodman heat pump system. Customer has lived in house about a year and has had someone else servicing the system. They put UV dye in the system and told the customer that "If they couldn't find a leak, there was no charge but if they did find a leak the charge would be $xxx.xx for the dye." They didn't find any leak! The customer called me because the hp wasn't operating --bug in contactor!!
My question is about the performance of this system at these conditions: ODT 85*, RAT 78*; LP 82 psi, HP 205 psi and SH was 9*, indoor drop was 14-15*. I recovered 1.5 lbs R-22. The LP was 77.4 psi, HP 199 psi, SH 10* indoor drop was still 14-15*.
The equiptment is: HP: CPLT42-1B, SN: 0501xxxxxx, AHU: ARUF049-00A-1B, SN: 0509xxxxxx. The duct system is typical flex duct runs in a radial configuration with 1300 CFM (at best) of supply openings. The return is a 24"x24" filter grille through wall into return cavity below AHU. The indoor blower has a slight "buffeting" noise (high static?--I didn't check SP).
I would have thought that by removing 1.5 lbs. of refrigerant that the SH would have increased more than 1*. The chart on the HP indicated that the SH should be 10-15* depending on indoor air temp. Also, I thought that the indoor split would have increased closer to 20*.
Is this AHU a match for this HP? If so, what is the correct piston in the AHU for this HP? Is the system possibly still slightly overcharged? The indoor temperature did drop 2-3* while I was working on the system.