York Single Package Cooling Unit ZE048H12B2A1ABA1A1

Ensure all power is shut off to the unit

Close the main manual shut-off valve

Remove screws holding the manifold to the burner supports

Open the union fitting in the gas supply line

Remove the gas piping closure panel

Disconnect wiring to the gas valves and spark ignitors

Remove the manifold-burner gas valve assembly

Replace the assemblies ensuring burners are level and seated at the rear of the heat exchanger

Ensure the use of appropriate pipe dope

Clean all piping of dirt and scale by hammering on the outside of the pipe

Blow out loose particles from the pipe

Purge all gas lines external to the unit of air before initial start-up

Remove the adjustment screw cap(s) on the regulator

To decrease the gas pressure, turn the adjusting screw counterclockwise

To increase the gas pressure, turn the adjusting screw clockwise

Enter the current manifold pressure

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

Note: The actual manifold pressure depends on the local fuel heating value

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?

Measure the amperage of the scroll compressor.

Are the suction and discharge pressures normal?

Is the noise level of the scroll compressor normal?