York Single Package Air Conditioner ZXG09D2A3AA1A111A2

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).

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")?

Gas Connection and Pressure Check

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

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

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 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 of run time

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

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?