York Single Package Air Conditioner ZF120N24D7A1BAA1A3

Check for proper compressor rotation

Verify blower rotation direction

Inspect electrical connection for misphasing

Change the phasing of the Field Line Connection if necessary

Check if the scroll compressor is drawing low amperage

Check for similar suction and discharge pressures

Ensure main manual shut-off valve is closed and all power to the unit is shut off

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

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

Disconnect wiring to the gas valves and spark igniters

Remove the manifold & gas valve assembly

Inspect and/or replace orifices

Remove the heat shield on top of the manifold supports to access burners

Reverse the procedure to replace the assemblies

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

Measure deflection distance using belt tension checker

Enter the deflection force applied

Re-tighten nuts (A) after adjustment

Was the belt tension checked at least two times during the first 24 hours of operation?

Inspect the unit for possible damage during transit

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

Request inspection by the carrier’s agent in writing

Ensure installation complies with local, state, and national codes

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.