Strange happenings with a Scroll compressor. Enlighten me.

Something really strange happened at work today. Installed a new 3 phase Copeland Scroll (ZP54K3E-TFD-522), R-410a.

Wired it as T1-R, T2-Y & T3-B.

Suction: 140 psig Discharge: 580 psig RLA: 8.7 A (FLA 10 A) No abnormal sound so we assume it's wired properly.

Space temperature was really high, the condenser isn't properly ventilated and the thermostat cable isn't armored so lot of interference with the 25 V signal. It keeps cutting out.

Technician then changes the phase connections. New wiring

T1-B , T2-Y & T3-R

Suction: 123 psig Discharge: 490 psig RLA: 7.7 A No abnormal sound and the unit isn't cutting off. Works like a charm. No calls so far (thankfully)

We can't figure out why it behaved the way it did? We know what a reversed Scroll sounds like. It should have gone bonkers atleast once. But nothing happened.

Any insights?

submitted by /u/ballfondlr
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