York Rooftop Unit DJ210N32A4BBC2A

Initial Temperature Measurement

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

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

Calculate the temperature rise (difference between heated air and return air)

Is the temperature rise within the range shown on the rating plate and Gas Heat Application Table 4?

Calculate the required CFM using the formula: CFM = (Btuh Input x 0.8) / (108 x deg F Temp Rise)

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)

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

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

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