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LOW NOx HEATERS (CONTINUED)
BURNER TRAY REMOVAL
1. Shut off main electrical power switch to heater.
2. Shut off gas upstream of heater.
3. Remove front door.
4. Disconnect gas line from gas valve.
5. Remove (2) screws that mount burner tray to the
base of the unit, and (2) screws that mount the
blower box to the burner tray, and (1) screw that
secures the anti-rotation bracket to the heater.
6. Disconnect wires that terminate at gas valve.
7. Unscrew (4) screws that secure the control box.
8. Disconnect pilot wire from the pilot assembly.
9. Disconnect wire connector from the combustion
blower.
10. Carefully slide out the burner tray assembly.
11. Reverse above procedure to reinstall.
GAS VALVE REMOVAL
1. Remove burner tray, following above procedure.
2. Disconnect, pilot tubing from gas valve.
3. Remove (2) screws that mount anti-rotation
bracket to the burner tray.
4. Turn vertical gas pipe from manifold slightly and
unscrew gas valve.
5. Reverse above procedure to reinstall.
PILOT REMOVAL
1. Disconnect pilot tubing from gas valve.
2. Remove the pilot wire from the pilot assembly.
3. Remove (2) screws that mount the pilot assembly
to the burner tray.
4. Pull the pilot assembly downwards and outwards.
5. Reverse above procedure to reinstall.
COMBUSTION BLOWER REMOVAL
1. Remove the (2) screws that secure the blower box
to the burner tray.
2. Remove (2) screws that mount the blower box to
the base of the heater.
3. Disconnect wire connector from the combustion
blower.
4. Carefully remove blower box with combustion
blower.
5. Remove (2) screws that secure combustion blow-
er to blower box.
6. Reverse above procedure to reinstall.
Low NOx Horizontal Pilot
BAFFLE
MOUNTED INLET SIDE
PILOT
LOW NOx
BURNER
BURNER
HOLD-DOWN
BRACKET
COMBUSTION
AIR BLOWER
GAS ORIFICE
GAS VALVE
Low NOx Burner Tray
MAIN BURNER AND ORIFICE REMOVAL
1. Remove burner tray, following above procedure.
2. Remove pilot. See pilot removal procedure.
3. Remove (8) total screws from the burner 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 air/gas
manifold assembly from the burner tray assembly.
5. Remove burners by raising them straight up off the
rear end slots.
6. Use a long 9/16” socket wrench to remove orifice
from the gas manifold.
7. Reverse above procedure to reinstall.