York Single Package Cooling Unit ZD-03J00A2A1AAA1A1

Use special pipe dope for assembly

Clean 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

Remove the adjustment screw cap(s) on the regulator

Enter the current manifold pressure reading

Is the manifold pressure set to the factory standard of 3.50 IWG?

Describe any deviations from the expected manifold pressure

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

Is the deflection force within the recommended range?

Re-tighten nuts (A) after adjustment

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 similar?

Is the scroll compressor producing a high noise level?

Check that all filters are in place and clean

Are the filters clean and in good condition?

Clean or replace filters if necessary

Are the filters installed ahead of the evaporator coil?

Inspect evaporator coil for frost or damage

Is the unit operating with filters properly installed?