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ADJUSTMENTS & REPLACEMENT OF COMPONENTS
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.
Gas Valve Removal
1.Shut off gas supply to the heater. Remove gas pip- ing to gas valve inlet.
2.Disconnect wires, pilot tubing and bleed line, if required.
3.Turn vertical gas pipe from manifold slightly and unscrew gas valve.
4.Reverse above procedure to
Pilot Removal and Cleaning
1.Disconnect pilot tubing at pilot and sensor/igniter wire. Remove screws holding pilot bracket to burn- er drawer.
2.Remove pilot and bracket, clean pilot of debris, small bugs, etc., with wire or small brush.
3.Replace pilot, pilot tubing, sensor ignition wires and check for leaks.
Burner Drawer Removal
1.Shut off power and gas supply to the heater. Disconnect union(s) and pilot tubing, then loosen and remove burner hold down screws.
2.Disconnect wires at gas valve and slide burner drawer out.
Main Burner and Orifice Removal
1. Remove screws and burner hold down bracket.
NOTE: If the heat exchanger is sooted badly, the burner hold down bracket and spacer can become distorted from direct flame impingement and this usually necessitates replacement of these parts.
2.Lift burners from slotted spacer and slide from ori- fices. Clean with a wire brush.
3.Orifices usually do not need to be replaced. To clean, run either copper wire or wood through ori- fice. Do not enlarge hole. To remove orifice, use a socket wrench and remove the manifold. DO NOT over tighten when reinstalling.
High Limit or Tankstat Removal
1.Turn off electrical power.
2.Remove front inspection panel.
3.Remove wires to high limit and loosen screws holding high limit to cabinet.
4.Remove wedge clip holding sensing bulb in con- trol well.
5.Remove high limit and install a new one.
6.Check control operation before leaving job.
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
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
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
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
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