York Single Package Air Conditioner ZXE12E2A3AA1A111A2

Ensure ZX units are properly phased at the factory

Is the blower rotating in the correct direction at start-up?

Is the electrical connection to the unit correctly phased?

Change the phasing of the Field Line Connection if misphased

High-leg Delta Power Supply Check

Measure voltage of A or L1 phase to ground

Measure voltage of B or L2 phase to ground

Use a special pipe dope for assembling wrought iron or steel pipe.

Select the appropriate compound for pipe assembly

Clean all piping of dirt and scale by hammering on the outside of the pipe.

Blow out loose particles from the pipe.

Have all gas lines external to the unit been purged of air?

Close main manual shut-off valve

Open the union fitting upstream of the unit gas valve and downstream from the main manual shut-off valve

Remove screws holding each end of the manifold to the manifold supports

Disconnect wiring to the gas valve

Remove the manifold & gas valve assembly

Adjust blower speed and belt tension

Tighten blower pulley set screws

Tighten motor sheave set screws

Post 10-12 Hours Run Time Checks

Re-check blower pulley set screws

Re-check motor sheave set screws

Loosen the three nuts (A and B on side and C on back) of motor mount slide plate.

Adjust tension by placing a flat head screwdriver into the belt tightening slots and applying pressure against the motor mounting plate.

Tighten the three loosened nuts (A, B and C).

Enter the deflection distance obtained (in mm).

Is the deflection distance 4mm (5/32")?

Re-tighten nuts (A, B and C) after adjustments are completed.