Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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49
Upper Burner Assembly
1. Remove the Combustion Chamber Front Panel. Refer to „Combustion Chamber Front
Panel‟ procedure on page 48.
2. Remove two retaining screws located on the underside of Upper Burner Assembly.
3. Remove the Upper Burner Assembly by sliding forward out of the Heat Exchanger.
4. Reassemble in reverse order of above being careful not to pinch or damage wiring.
Replace gaskets if required.
5. Test for gas leaks using soapy water solution.
Flame Sensor
1. Remove the Upper Burner Assembly. Refer to „Upper Burner Assembly‟ procedure
above.
2. Remove the protective silicon tube and flame sensor lead from Flame Sensor A or B.
3. Loosen retaining screw from Flame Sensor Holder A or B and remove Flame Sensor.
4. Reassemble in reverse order of above. Replace gaskets if required.
5. Test for gas leaks with soapy water solution.
Igniter Electrode
1. Remove the Upper Burner Assembly. Refer to „Upper Burner Assembly‟ procedure
above.
2. Remove the protective silicon tube and spark lead from Igniter Electrode.
3. Loosen retaining screw from right hand flame sensor holder and remove the Igniter
Electrode.
4. Reassemble in reverse order of above. Replace gaskets if required. NOTE: Ensure
wiring to igniter and flame sensors is not pinched during reassembly.
5. Test for gas leaks with soapy water solution.
Proportional Gas Flow Regulating Valve
1. Remove the Lower Burner Assembly. Refer to „Lower Burner Assembly‟ procedure on
page 48.
2. Disconnect the gas supply pipe from the Gas Inlet Connection.
3. Remove the three silver screws from the Gas Inlet Connector on the outside of the
water heater cabinet.
4. Carefully remove the Proportional Gas Flow Regulating Valve (PGFR) from the water
heater.
5. Disconnect the multi-pin wiring plugs from the Gas Inlet Solenoid Valve (GISV), the
Proportional Gas Flow Regulating Valve (PGFR) and Solenoid Valves 1 & 2.
6. Reassemble in reverse order of above. Replace gaskets if required.
7. Test for gas leaks with soapy water solution.