York Rooftop Unit DJ210N32B4BBC2A

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?

Is the blower drive belt tension correct?

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

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

Initial Temperature Measurements

Measure the return air temperature (6 feet from the furnace)

Measure the heated air temperature (6 feet from the furnace)

Is the temperature rise within the range shown on the rating plate?

Adjust the variable pitch pulley on the blower motor to obtain desired supply air CFM

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 3.65 IWG ±0.3?