York Rooftop Unit DJ300N32A4BBC2A

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 increment (1/2 or 1 cubic foot)

Enter the number of seconds for each revolution

Enter the furnace rating in Btuh

Calculate the cubic feet of gas consumed per hour using Table 26 and enter the value

Ensure the furnace is turned off before starting the adjustment

Gather necessary tools for adjustment

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

Measure the manifold pressure after adjustment

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

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

Are burners accessible for service?

Reverse the procedure to replace the assemblies

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)

Remove pilot adjustment cover screw

Adjust the clearance for air to the desired level

Replace cover screw after adjustment to prevent possible gas leakage

Observe through complete cycle to ensure all controls function properly