York Single Package Cooling Unit ZD-04J00A2A1AAA1A1

Use a special pipe dope when 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 pipe

Ensure all gas lines external to the unit have been purged of air before initial start-up

Loosen six nuts (top and bottom) A

Ensure nuts (C) are not loosened

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

Enter the deflection distance obtained (in mm)

Enter the deflection force applied (in N)

Is the deflection distance within the recommended range?

Is the deflection force within the recommended range?

Check that all filters are in place and clean

Clean or replace filters if dirty

Ensure filters are installed ahead of evaporator coil

Are the filters installed correctly?

Is the unit operating with filters properly installed?

Close main manual shut-off valve

Shut off all electric power to the unit

Remove screws holding manifold to burner supports

Open union fitting in gas supply line upstream of unit gas valve

Remove gas piping closure panel

Disconnect wiring to gas valves and spark ignitors

Remove manifold-burner gas valve assembly by lifting up and pulling back

Verify that the ZE units are properly phased at the factory.

Is the blower rotating in the correct direction?

Is the compressor rotating in the correct direction?

Measure the amperage of the scroll compressor.

Are the suction and discharge pressures normal?

Is the noise level of the scroll compressor normal?