TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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59
Component Replacement
WARNING
H.S.I models are fitted with a 3 plug. All procedures relating to replacement of
electrical components assume removal of the plug from the GPO will safely isolate
the appliance electrically
HOWEVER where ancillary equipment, such as a power flue, has been electrically
interlocked with the water heater or the water heater has been hard wired extreme
caution must be exercised to ensure ‘live’ conductors are not present from the
additional circuit(s)
It is strongly recommended that the power supply to all ancillary equipment is also
isolated when servicing any water heater electrically interlocked to it
Personal Protective Equipment should be worn to reduce the risk of electric shock
Refer to Rheem Safety Procedure on electrical testing
Draining the Water Heater (Procedure 1)
Elevated temperatures may be present during the draining process. Personal
Protective Equipment should be worn to prevent the risk of scalding
1. Remove 3-pin plug from GPO and isolate the gas and water supplies to the water
heater
2. Relieve pressure from the water heater through T & PR valve or a hot tap
3. Fit a drain hose to the drain cock outlet and run the other end to a drain or safe location
4. Open the drain cock
5. Open the temperature and pressure relief valve to allow air into the system
Gas Control Replacement (Procedure 2)
1. Remove 3-pin plug from GPO & isolate gas supply to heater (note warning
above)
2. Outdoor Models
- Remove the lower access door
Indoor Models
- Remove the gas valve cover Note: It will be necessary to disconnect
the wiring to the thermostat, temperature sensor and ignition module to allow complete
removal of the gas valve cover
3. Disconnect the wiring from the ignition module to the gas valve terminal block, noting
the positions of each wire.
4. Disconnect the inlet gas pipe work
5. Disconnect the burner feed pipe
6. Remove the screw retaining the gas valve to the support bracket
7. Remove the gas valve
8. Reassemble in the reverse order of above. Note: On indoor models ensure the lip on
the bottom of the gas control cover engages inside the jacket opening
9. Restore gas and test all inlet gas connections for leaks using soapy water solution
10. Restore power
11. Allow heater to light and test all outlet gas connections for leaks using soapy water
solution. NOTE: On the 631275 it will be necessary to hold the door switch closed
while conducting the leak test
(53 pages)
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