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How to kill a compressor in 2 years
Just went out on a new service call the other day. Typical 2.5 ton heat pump system. Cleaned coils and traps and all the normal stuff, then threw my gauges on. 40° evap temp but no superheat. Ok. measured airflow and it is scarcely 300 cfm per ton. Checked the fan speed and both the heat and cool wires are on the low tap. Ugh. Set the proper airflow for both cooling and heating and back to the gauges. Higher evap temp but no superheat. Orfice system. Ok, time for the recovery cyclinder. As I start removing refrigerant the condenser pressure starts dropping even while I still don't have any superheat. By the time I had a 10° delta-t on the condenser, no superheat and a high evap temp, at the proper cfm, my heart began to sink. Doing due diligence, I recovered all the Freon and checked the orfices for the proper size. They were. I weighed the proper charge back in, 8.75lbs and left the other 6lbs that I recovered in the jug.
In a nut shell, we had a bad compressor from the overcharge and the low fan speed in hp mode.
The homeowner was incredibly angry. I would be to! Come to find out, out of three quotes he chose the one that was 2k less than the others. To bad.
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