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7. Using an Allen wrench, turn the screw clockwise to
increase or counterclockwise to decrease high fire
manifold pressure –see Fig. 47.
8. Install the spring, weight and aluminum cap –tight-
en the cap using same # of turns as was used in
removing the cap.
9. For low fire adjustment, tighten the aluminum cap
to increase and loosen to decrease low fire mani-
fold pressure.
10. Install 2-stage solenoid valve and turn heater on,
check manifold pressures.
11. Repeat steps 3 to 10 until correct manifold pres-
sures are obtained.
12. Secure 2-stage solenoid valve by tightening the
3/8" nut or #10 Torx screw.
Gas Valve Removal
1. Remove burner tray. See Burner Tray Removal
procedure.
2. Disconnect, pilot tubing from gas valve.
3. Turn vertical gas pipe from manifold slightly and
unscrew gas valve.
4. Reverse above procedure to re-install.
Main Burner and Orifice
Removal
1. Remove burner tray. See Burner Tray Removal
procedure.
2. Remove pilot. See Pilot Removal procedure.
3. Remove (8) total screws from the hold-down
brackets, front and rear of tray.
4. Remove (8) total screws from the left and right
sides of the manifold assembly. Detach the mani-
fold assembly from the burner tray assembly.
5. Remove burners by raising the bracket on the
back end of the burners up and out of their slots.
6. Use a long ½" socket wrench to remove orifices
from the gas manifold.
7. Remove burners by raising the bracket on the
back end of the burners up and out of their slots.
8. Reverse above procedure to re-install.
Pilot Removal
1. Disconnect pilot tubing from gas valve.
2. Remove (4) screws from control box. Open the
control box.
3. Remove the pilot wire from the ignition wire.
4. Remove (2) screws that mount the pilot bracket to
the air manifold assembly.
Fig. 48: IID Pilot
5. Pull the pilot bracket slightly, then drop and pull
downwards and outwards.
6. Reverse above procedure to re-install. Make sure
the pilot bracket is all the way up on the pilot side,
see drawing below.
Fig. 49: Pilot Removal
Combustion Fan Removal
1. Remove burner tray. See Burner Tray Removal
procedure.
2. Remove (4) screws that mount the combustion
blower to the manifold assembly.
3. Reverse above procedure to re-install.
32
FOR HEATERS
MADE IN OR AFTER
AUGUST 2001
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