York Single Package Air Conditioner ZT049Q00A2A1AAA1A2

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.

Inspect the smoke detector for any visible damage or obstruction.

Measure the temperature around the smoke detector to ensure it is within operational limits (-4°F to 158°F).

Measure the pressure differential across the smoke detector's sampling and exhaust ports.

Is the pressure differential within the range of 0.01 to 1.11 inches of water?

Verify that the unit is 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.

Is the scroll compressor drawing low amperage?

Measure the suction pressure of the scroll compressor.

Measure the discharge pressure of the scroll compressor.

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?

Close main manual shut-off valve

Open the union fitting upstream of the unit gas valve

Remove screws holding manifold to supports

Disconnect wiring to the gas valve

Remove manifold & gas valve assembly