York Single Package Air Conditioner ZF150N24D7A1BAA3A1

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

Was a commercially available soap solution used for leak detection?

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?

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

Use belt tension checker to apply perpendicular force to one belt at midpoint of span

Enter the deflection distance obtained (mm)

Enter the deflection distance obtained (inches)

Use a straight edge from sheave to sheave as reference line to determine deflection distance from normal position

Record the recommended deflection force for the belt section

Check that all filters are installed ahead of the evaporator coil

Inspect filters for dirt and debris

Clean or replace dirty filters with the same size and type

Ensure the unit is not operated without filters properly installed

Verify panel latches are properly positioned to maintain an airtight seal

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