York Single Package Air Conditioner ZXEA7E2A3AA1A111A2

Ensure all necessary safety equipment is on hand

Verify that a special pipe dope is used for assembling pipes

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

Use a commercially available soap solution to check all joints for leaks

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")?

After adjustments are completed, re-tighten nuts (A, B and C).

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

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

Review installation for errors, leaks, or undesirable system effects

Is the current blower speed causing any issues?

Enter the existing datum diameter (DD)

Calculate the new datum diameter (DD) using the formula: (Required CFM/Measured CFM)*Existing DD

Connect a manometer to the outlet pressure port on the gas valve to monitor the manifold pressure

Remove cover screws covering HI and LO pressure adjustment screws

Second Stage Pressure Adjustment

Set thermostat to call for second stage heat and start furnace

Is the second stage manifold pressure within the specified range?