ADJUSTMENTS/REPLACEMENTSOF
COMPONENTS
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after ser- vicing.
Make sure electrical power to the heater is
GAS VALVE REMOVAL
1.Shut off gas supply to the heater. Remove gas piping 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/ignitor wire. Remove screws holding pilot bracket to burnerdrawer.
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 necessi- tates replacement of these parts.
2.Lift burners from slotted spacer and slide from orifices. Clean with a wire brush.
3.Orifices usually do not need to be replaced. To clean, run either copper wire or wood through orifice. Do not enlarge hole. To remove orifice, use a socket wrench and remove the manifold. DO NOT overtighten when reinstall- ing.
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 control 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
IGNITIONMODULEREPLACEMENT
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
TRANSFORMERREPLACEMENT
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
CIRCULATORREPLACEMENT
1.Shut off electrical power to the heater.
2.Shut off water supply and open drain valve to remove water in the piping at the pump level.
CAUTION: To avoid damage to electrical components keep water from getting into the control compartments and gas valve.
3. Disconnect wiring and conduit connections to the pump.
4.Remove the nuts and bolts at the inlet and outlet flanges. Remove old gaskets.
5.Remove the pump.
6.Reverse the above procedure to
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