Hi all,
I have a Goodman heat pump here in Northern Va. The evaporator started freezing up on it a week ago. I changed filters removed service door from air handler and checked A coil for being dirty. It's clean as a hosed it down last year. There was water an inch deep in the pan under the coil. I unstopped the drain.
Now I found the outside condenser low side frozen heavy. So I washed the outside unit good and the fan is strong inside and on the outside unit. So I hooked up my dads gauges ( he passed away 10 days ago and was a Sears service tech retired). With the unit running in cool I hooked up the R22 tank and purged the lines. I taped his thermocouple from his meter to the low side about 2" away from the service valve. 84 deg F on it. Low side pressure was 35 psi and high side was 185.
I left tank upright and opened tank and bleed lines. I filled several times a few minutes each until low side reached 55 psi and high side was 195. The r22 saturation temp on the gauge was 100 and low side temp on thermocouple was 86. That's 16 degrees supercool correct??? The unit is 15 years old and never has needed charged. I looked real hard and see no oil spots or leaks. It's working fine but do you think I'm good?????? I have just been watching my dad for years....Thanks
I reposted this here as it was in the wrong forum.
It sounds like you took the high side saturation temp and used the low side line temp to determine subcooling. You need to measure the high side line temp and subtract it from your 100F high side saturation temp to determine subcooling.
It sounds like you have a leak somewhere. You need a low side pressure of at least 55 PSIG as anything below a 32F low side saturation temp will cause the suction line and evaporator to ice up.
Admin, your right I took the wrong temp. The low side is at 55psi. My R22 drum is low but you can still feel liquid moving around in it. I suppose I should try to get the low side to 60 psi any how right? The air inside is 55 deg blowing out of the register and is working ok for now.
Yes, prolonged use at that temp will likely cause the system to ice up again.
Charge with vapor when using R22. What's the outdoor temp when you're charging?