York Rooftop Unit DJ240N32C4BBC2A

Close main manual shut-off valve and shut off all electric power to the unit

Remove the screws holding either end of the manifold to the burner supports

Open the union fitting in the gas supply line just upstream of the unit gas valve and downstream from the main manual shut-off valve

Remove the gas piping closure panel

Disconnect wiring to the gas valves and spark ignitors

Remove the manifold-burner gas valve assembly by lifting up and pulling back

Ensure burners are accessible for service

Reverse the procedure to replace the assemblies

Ensure the furnace is turned off

Gather necessary tools for adjustment

Remove the cap on the regulator located next to the push-on electrical terminals

Measure the current manifold gas pressure

Measure the adjusted manifold gas pressure

Is the manifold pressure within the correct range of 3.65 IWG ±0.3?

Check the electrical supply voltage being supplied

Is the electrical supply voltage the same as listed on the unit nameplate?

Set the room thermostat to the off position

Set the room thermostat fan switch to on

Is the indoor blower rotation correct?

Check blower drive belt tension

Check the unit supply air (CFM)

Turn off all other gas appliances connected to the gas meter

Measure the time needed for one revolution of the hand on the smallest dial on the meter with the furnace turned on

Enter the size of the test dial (1/2 or 1 cubic foot)

Enter the number of seconds for one revolution

Enter the furnace rating in Btuh

Enter the Btu content of the gas in your locality

Ensure the pilot flame envelopes the end of the flame sensor

Put the system into operation and observe through complete cycle to ensure all controls function properly

Remove pilot adjustment cover screw

Adjust the clearance for air to the desired level

Replace cover screw after adjustment to prevent possible gas leakage