Bad Compressor or compressors?

[kroymca]

CARRIER
MODEL# 48TJE012---511GA
SERIAL# 1297G30820

TEN TON TWO STAGE RTU
STAGE ONE OPERATION NORMAL 17.5 AMPS
STAGE TWO VOLTAGE NO OPERATION OHM'D S,R,C WINDINGS FOUND OL ON ALL.
PLAN IS TO REPLACE COMPRESSOR 2. WOULD THERE BE REASON TO REPLACE COMP 1 EX: ACID FROM COMP 2 BURNING OUT

BEAR WITH ME I'M FAIRLY NEW TO THE COMMERCIAL HVAC

THANKS

[timebuilder]

I would do one only. No interconnection between stages.

[timebuilder]

And don't use caps when posting. Thanks.

[y7turbo]

Was the compressor shell really hot when you ohmed the windings, or was it cold?

[John Culpepper]

It could have been out on thermal OL. Were any of the winding shorted to ground? I'm assuming if you have S R C windings that it is single phase, and so was the capacitor checked?

[R123]

I don't ever think I've seen a 10 ton single phase package unit. I'm assuming this unit is 3 phase and your ohming across L1, L2, & L3. Most of the times the terminals are marked R,S,&C in addition to L1, L2, & L3. As previously posted, are you sure the thermal overload wasn't opened? You would have to have at least 2 windings open for all 3 legs to show open if the overload was closed plus you would more than likely show a ground. Was the compressor hot when you checked it?

[timebuilder]

The OP is just confused because CSR is still shown along with T1, T2, and T3. The 012 is a three phase unit.

[kroymca]

it was cold. i removed all the wires to it, so any capacitor would be out of the loop. overload was closed.

[R123]

Just curious.....how did you determine the overload was closed?

[timebuilder]

There are no caps in the compressor wiring. Three phase compressors don't use them or need them.