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I have been stumped on this problem for a few weeks now. I completed an HVAC course last year, but mainly for my own benefit on my rentals, so I don't get a ton of experience. The tenant has complained about low heat from the heat pump. The system is about 10 years old R22. I'm not real familiar with determining subcooling/superheat during the winter with the low ambient temperatures. However, I thought I would get the measurement anyway. When I attempted to determine them, I put my gauges on the system, and both sides were equal (yes, my manifold valves were shut). I switched heating to cooling and the pressure rose, but was still equal between the sides. I didn't even bother to determine the SC/SH. The suction and discharge lines were significantly different temperatures, and when placed in heat mode, the normal suction line (larger tube) was indeed hot and heat was being put into the home. I've read some posts from previous years that members have commented on and several mention the reversing valve. This may be a factor. I am in N. Florida so lately, some days we may still place the system in cooling mode. It seems to cool well in cool mode. My thought is that it would be a failed metering device or compressor, since these are the components that separate the pressures. I have not checked the compressor draw and know I need to, but the equal pressures with temperature differential on the suction and discharge through me for a loop. I'm not thrilled about it, but at this point I think I need to recover the refrigerant, replacing the filter/dryer of course, and the metering device. I think that if it were the compressor there would be no temperature difference.. Any help... Thoughts... ideas... would be appreciated. Thanks.

File Name: Tempstar Furnace 80+ Installation Manual File Submitter: RegUS_PatOff File Submitted: 22 May 2013 File Category: Appliance Repair Manual Pot Luck Supper Tempstar Furnace 80+ Installation & Wiring Diagrams FBF050B12G1 FBF075B12G1 FBF075F16G1 FBF100F14G1 FBF100F20G1 FBF100J22G1 FBF125J20G1 FBF125J22G1 GDE050B12G1 GDE075B12G1 GDE075F16G1 GDE100F14G1 GDE100F20G1 GDE125J20G1 GNE050B12G1 GNE075B12G1 GNE075F16G1 GNE100F14G1 GNE100F20G1 GNE100J20G1 GNE125J20G1 GNE150J20G1 NBF050B12G1 NBF075B12G1 NBF075F16G1 NBF100F20G1 NBF100J20G1 NBF100J22G1 NBF125J20G1 NBF125J22G1 NDF050B12G1 NDF075B12G1 NDF075F16G1 NDF100F14G1 NDF100F20G1 NDF125J20G1 NDN3050FBG1 NDN3075FBG1 NDN3075HFG1 NDN3100GFG1 NDN3100KFG1 NDN3125KJG1 NDN6050FBG1 NDN6075FBG1 NDN6075HFG1 NDN6100GFG1 NDN6100KFG1 NDN6125KJG1 NNE050B12G1 NNE075B12G1 NNE075F16G1 NNE100F20G1 NNE100J20G1 NNE125J20G1 NTC6050FBG1 NTC6075FBG1 NTC6075HFG1 NTC6100GFG1 NTC6100KFG1 NTC6100KJG1 NTC6125KJG1 NTC6150KJG1 NTG3050FBG1 NTG3075FBG1 NTG3075HFG1 NTG3100GFG1 NTG3100KFG1 NTG3100LJG1 NTG3125KJG1 NTG3125LJG1 NTN3050FBG1 NTN3075FBG1 NTN3075HFG1 NTN3100KFG1 NTN3100KJG1 NTN3100LJG1 NTN3125KJG1 NTN3125LJG1 NTN6050FBG1 NTN6075FBG1 NTN6075HFG1 NTN6100KFG1 NTN6100KJG1 NTN6125KJG1 Click here to download this file