FIG. 15 - PROPER FLAME ADJUSTMENT

530.18-N11Y

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FIG. 15 - PROPER FLAME ADJUSTMENT

3.To increase the gas pressure, turn the adjusting screw clockwise.

NOTE: The correct manifold pressure for these furnaces is 3.65 IWG ± 0.3.

PILOT CHECKOUT

Reverse the above procedure to replace the assemblies. Make sure that burners are level and seat at the rear of the heat exchanger.

BURNER AIR SHUTTER ADJUSTMENT

Adjust burner shutters so no yellow flame is observed in the heat exchanger tubes.

CHECKING SUPPLY AIR CFM

The RPM of the supply air blower will depend on the required CFM, the unit accessories or options and the static resistances of both the supply and the return air duct systems. With this information, the RPM for the supply air blower and the motor pulley adjustment (turns open) can be determined from the Blower Performance Data Table.

A high speed drive accessory 1LD0435 (containing a smaller blower pulley and shorter belts) is available for applications requiring the supply air blower to produce higher CFM’s and/or higher static pressures. Refer to the Blower Motor and Drive Data Table.

Note the following:

The pilot flame should envelope the end of the flame sensor.Refer to Proper Flame Adjustment figure. To adjust pilot flame, (1) remove pilot adjustment cover screw, (2) increase or decrease the clearance for air to the desired level, (3) be sure to replace cover screw after adjustment to prevent possible gas leakage.

Put the system into operation and observe through complete cycle to be sure all controls function properly.

BURNER INSTRUCTIONS

To check or change burners, pilot or orifices, CLOSE MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELECTRIC POWER TO THE UNIT.

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

2.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.

3.Remove the gas piping closure panel.

4.Disconnect wiring to the gas valves and spark ignitors. Remove the manifold-burner gas valve assembly by lifting up and pulling back.

Burners are now accessible for service.

FIG. 16 - TYPICAL FLAME APPEARANCE

FIG.17 - BELT ADJUSTMENT

1.The supply air CFM must be within the limitations shown in Unit Application DataTable.

2.Pulleys can be adjusted in half turn increments.

3.The tension on the belts should be adjusted as shown in the belt adjustment figure below.

Start the supply air blower motor. Adjust the resistances in both the supply and the return air duct systems to balance the air distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other than the equipment installer.

To check the supply air CFM after the initial balancing has been completed:

1.Remove the two 5/16" dot plugs from the blower motor and the filter access panels.

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Unitary Products Group

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York D2CE Proper Flame Adjustment, Pilot Checkout, Burner Air Shutter Adjustment, Checking Supply Air Cfm, Belt Adjustment
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D2CG300, D2CE specifications

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