York Single Package Air Conditioner ZXG14E2A3AA1A111A2

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

Inspect orifices for wear or damage

Inspect the unit for visible damage during transit

Note the extent of any damage on the carrier’s freight bill

Request inspection by the carrier’s agent in writing

Is the furnace disconnected from the gas supply piping system?

Enter the pressure of the gas supply piping system

Is the pressure of the gas supply piping system equal to or less than 1/2 PSIG?

Ensure the furnace is isolated from the gas supply piping system by closing its individual manual shut-off valve

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.

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 piping

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

Review installation for errors, leaks, or undesirable system effects

Verify blower speed changes are necessary

Calculate new datum diameter (DD)

Adjust the variable pitch motor sheave to the new DD

Check for changes in static pressure and BHP

Ensure AMP draw of the blower motor is within safe limits

Confirm blower speed changes adhere to fan laws

Verify airflow meets required CFM

Only qualified personnel should perform blower speed changes