FieldBench
York codes

York

Phase

Lockout

Phase loss / rotation

Three-phase monitor opened.

Walk Phase in Diagnose

Sign in for the next measurement

First check

1 Three legs at the disconnect and the contactor

On York ZF measure L1 L2 L3 at the disconnect and at the compressor contactor. A phase monitor trips on loss, imbalance, or reverse rotation. Measure all three legs at the disconnect and at the contactor.

Expect: All three legs, nameplate voltage ±10%, phase monitor closed.

The rest of the walkthrough is Diagnose.

On the plates

  • Measure all three legs at the disconnect and at the contactor.
  • Condenser fan and compressor rotation. Swap two legs only after you confirm this unit is 3-phase on the plate.

Plates that use Phase

Same number, other makers

Phase on York is not the same code on these plates.