York Single Package Cooling Unit ZD-A6K00A2A1AAA1A1

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

Check that all filters are in place and clean

Are the filters clean and in good condition?

Was the evaporator coil inspected for cleanliness?

Is filter replacement necessary?

Replace filters with the same size and type

Are the panel latches properly positioned to maintain an airtight seal?

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

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

Is the electrical connection to the unit correctly phased?

Is the compressor rotating in the correct direction?

Check for signs of misphasing in the scroll compressor

Is the supply air blower rotating in the correct direction?

Is the line voltage at the unit point of power connection correctly phased?

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. NEVER USE A FLAME.