York Single Package Air Conditioner ZXG08D2A3AA1A111A2

Open the main shut-off valve to admit normal gas pressure to the mains.

Check all joints for leaks using a soap solution or other suitable material.

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 (1/4" X 1/2") in the motor mount slide plate and applying pressure against the motor mounting plate.

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

Determine the deflection distance from normal position using a straight edge from sheave to sheave as reference line.

Use belt tension checker to apply a perpendicular force to the belt at the midpoint of the span and measure deflection distance.

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

Review installation for errors, leaks, or undesirable system effects

Verify blower speed changes are necessary

Calculate new datum diameter (DD)

Adjust the datum diameter (DD) of the variable pitch motor sheave

Check BHP and AMP draw of the blower motor

Ensure only qualified personnel make blower speed changes

Adjust blower speed to specific static and CFM requirements

Adjust belt tension to specific static and CFM requirements

Tighten blower pulley set screws

Tighten motor sheave set screws

Re-check set screws after 10-12 hours run time

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 Precautions

Ensure high-leg conductor is not attached to X13 or ECM motors

Measure voltage of A or L1 phase to ground