York Single Package Cooling Unit ZD-03H00A2A1AAA1A1

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?

Note any deviations from the expected manifold pressure

Use special pipe dope for assembling pipes

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

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

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

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

Inspect the unit for possible damage during transit

Note the extent of any damage on the carrier’s freight bill

Request inspection by the carrier’s agent in writing

Ensure installation instructions are followed

Is the furnace disconnected from the gas supply piping system?

Is the gas valve replaced if subjected to pressure greater than 1/2 PSIG?