Saw this today when I was mentally kaput already.
TXV. Package. R410. Suction sat, 45 F. Suction line, 50 F.
Liquid sat, 114 F. Liquid line, 97 F. Mfg suggested SC for
ambient of 100 F, 17 degrees, so it was spot on.
Unit actually cooling fine. But from what resident
said, it sounds like it was maybe shutting down on
compressor overload previous day.
I think I remember indoor WB about 62 and DB 78 F.
Actually, liquid sat pressure was initially about 390 psig.
I cleaned condenser coil and pressure dropped to whatever
114 F sat is.
The low, 5 F, superheat is what bugs me. Should a TXV
have that low of subcooling for 100 F ambient?
(My charging table for fixed orifice with these indoor/outdoor
temps does suggest 5 F superheat, but I thought TXVs operated
more safely, with a larger superheat as a rule.
Had a mercury thermostat and a lady that plays with it a lot.
Someone suggested that compressor could start up backwards
and result in overheating? Does that sound plausible for
230 V, single-phase?