York Single Package Air Conditioner ZJ150C24R4B5EAA1A1

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?

Read the safety warning carefully before proceeding

Ensure the use of appropriate pipe dope

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

Check all joints for leaks using a soap solution

Confirm no open flames are used during the leak test

Report any detected leaks immediately

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

Ensure burners are level and seated at the rear of the gas orifice

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

Measure deflection distance using belt tension checker

Determine deflection distance from normal position

Re-tighten nuts (A) after adjustment

Check that all filters are installed ahead of the evaporator coil

Inspect filters for dirt and debris

Replace filters with the same size and type if necessary

Ensure the unit is not operated without filters properly installed

Verify panel latches are properly positioned to maintain an airtight seal