Johnson-controls AFFINITY 340968-XIM-A-0108 User Manual download pdf (Page 16)

340968-XIM-A-0108

16 Johnson Controls Unitary Products

2. Turn off all electric power to the appliance if service is to

be performed.

3. Remove the control access panel.

4. Turn the gas valve switch to the OFF position. DO NOT

FORCE.

5. Replace the control access panel.

POST-START CHECK LIST (GAS)

After the entire control circuit has been energized and the

heating section is operating, make the following checks:

1. Check for gas leaks in the unit piping as well as the sup-

ply piping.

2. Check for correct manifold gas pressures. See Checking

Gas Input.

3. Check the supply gas pressure. It must be within the lim-

its shown on rating nameplate. Supply pressure should

be checked with all gas appliances in the building at full

fire. At no time should the standby gas line pressure

exceed 10.5", nor the operating pressure drop below

4.5" for natural gas units. If gas pressure is outside these

limits, contact the local gas utility for corrective action.

MANIFOLD GAS PRESSURE ADJUSTMENT

Small adjustments to the gas flow may be made by turning

the pressure regulator adjusting screw on the automatic gas

valve. Refer to Figure 10.

Adjust as follows:

1. Remove the cap from the valve body. See Figure 10 for

location.

2. To decrease the gas pressure, turn the adjusting screw

counterclockwise.

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

clockwise.

NOTE: The correct manifold pressure for natural gas fur-

naces is 3.5 IWG. The correct manifold pressure for

propane (LP) is 10.0 IWG.

BURNER INSTRUCTIONS

To check or change the burners, CLOSE THE MAIN MAN-

UAL SHUT-OFF VALVE AND SHUT OFF ALL POWER TO

THE UNIT.

1. Remove the two (2) #8 screws holding each burner in

place.

2. Remove the burner assembly from the manifold assem-

bly by moving the burner assembly forward, turn at an

angle and pull back.

3. Burners are now accessible for service.

PILOT INSTRUCTIONS

To check, adjust or remove the pilot assembly, CLOSE THE

MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL

POWER TO THE UNIT.

The pilot flame should envelope 3/8 inch of the end of the

flame sensor and not contain any yellow color, see Figure 12.

FIGURE 10 - GAS VALVE - FRONT

Electrical

Connection

Manual

Gas Switch

Pilot

djustment

(Remove Cap)

Manifold

Pressure

Adjustment

(Remove Cap)

Pilot Gas

Connection

Manifold

Pressure Tap

½ NPT

(Outlet)

FIGURE 11 - GAS VALVE - REAR

Line

Pressure

Tap

½ NPT

(Inlet)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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