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ADJUSTMENTS &
REPLACEMENT OF
COMPONENTS
Gas Valve Replacement
1. Shut off electrical power and gas supply to the
heater.
2. Remove gas piping to gas valve inlet.
3. Disconnect wiring connections, pilot tubing (when
equipped).
4. Remove screws (2) holding the burner tray.
5. Slide burner tray out.
6. Remove gas valve bracket screws and bracket.
7. Unscrew gas valve from gas pipe.
8. Reverse above procedure to re-install.
Pilot Burner Cleaning or
Replacement (Standing
Pilot)
1. Shut off electrical power and gas supply to the
heater.
2. Disconnect gas piping to gas valve.
3. Disconnect wiring connections to gas valve.
4. Remove screws (2) holding the burner tray.
5. Slide burner tray out.
6. Remove screw holding pilot lighter tube.
7. Remove screws (2) holding pilot bracket on the
burner tray.
8. Disconnect thermocouple and pilot tubing from the
gas valve.
9. Remove pilot burner from pilot bracket.
10. Remove pilot orifice and blow away lint or dirt.
Clean with wire or small brush.
11. Reverse above procedure to re-install.
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
DANGER: SHOCK HAZARD: Make sure electri-
cal power to the heater is disconnected to avoid
potential serious injury or damage to components.
NOTE: Make sure pilot orifice is clear, but do not
enlarge the hole.
Flame Roll-out Switch
Replacement
1. Shut off electrical power to the heater.
2. Remove wiring connections to switch.
3. Remove screws (2) holding the switch.
4. Reverse above procedure to re-install.
Vent Thermal Switch
Replacement
1. Shut off electrical power to the heater.
2. Remove wiring connections to switch.
3. Remove the screws (2).
4. Reverse above procedure to re-install.
Ignition Module Replacement
1. Shut off electrical power to the heater.
2. Remove control cover screws and open control
compartment.
3. Disconnect wiring connections to module.
4. Remove screws (2) holding module.
5. Reverse above procedure to re-install.
Transformer Replacement
1. Shut off electrical power to the heater.
2. Remove control cover screws and open control
compartment.
3. Disconnect wiring connections from transformer
leads.
4. Remove screws (2) holding transformer.
5. Reverse above procedure to re-install.
HONEYWELL PILOT ROBERTSHAW PILOT
AIR
OPENING
PILOT
ORIFICE
PILOT
ORIFICE
Fig. 20: Pilots