York Single Package Cooling Unit ZD-04C00A2A1AAA1A1

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?

Is the unit operating with filters properly installed?

Use appropriate 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

Verify that ZE units are properly phased at the factory.

Is the blower rotating in the correct direction?

Is the compressor rotating in the correct direction?

Check for signs of misphasing in the scroll compressor

Is the electrical connection to the unit misphased?

Describe the corrective actions taken to change the phasing of the Field Line Connection.

Gas Connection and Pressure Check

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

Record the gas pressure in the mains.

Check all joints for leaks using soap solution or other suitable material.

Were any leaks detected during the check?

Remove the adjustment screw cap(s) on the regulator

Verification of Manifold Pressure

Enter the current manifold pressure reading

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

Notes on local fuel heating value and its impact on manifold pressure