My question is about the sequence of operation during the defrost cycle.
I am an electronics technician with an engineering background.
The air handler is an RH1T4821STANJA, outdoor cube is an RP1548AJ1NA, therm
ostat is a Honeywell TH8000 series.
Installed April of 2015, AC works fine, cycles normally.
I am OCD about observing home appliances and equipment, and do [most of] my
own repairs, which drives my wife crazy, but I digress.
I have observed at least a half dozen defrost cycles, if I am there to do s
o, and I notice first of all that the RV is noisy, making a large "grunt" w
hen switching. The outdoor fan also stops, which I know is normal. What I
am concerned about is that the compressor also stops (nothing running outs
ide), at which time I can hear the refrigerant flowing until pressure is eq
ualized, then the compressor starts again in defrost (AC) mode. It does ru
n until ice is melted (usually around 3 min.), then stops again. All this
time, the air handler is running normally, and aux-heat is working to compe
nsate vent temp. Then after not quite a minute, the compressor and outdoor
fan come back on, and we're back to normal operation.
I previously had a Bryant heat pump, and during defrost, the compressor nev
er cycled off during defrost operation like this one does.
My question is whether this is normal, or if this is indicative of an impro
per charge (call service) or a wiring issue (which I can fix)?
- posted 5 years ago