Service manual

31
Maintenance
SERVICE PROCEDURE
To carry out a full service on this appliance the following has to be carried out:-
1. The Injector manifold should be removed, inspected and cleaned if required
( see page32)
2. The combustion chamber plate removed and both ignition and ionisation elec-
trodes inspected and cleaned ( see page 32 )
3. Remove complete burner box visually inspect and clean if required, playing par-
ticular attention to where the ignition electrode sparks to ( see page 32 )
4. Visually inspect combustion chamber and up onto base of heat exchanger,
check for leaks, soiling of fins ect.
5. Remove fan assembly being careful of the air thermistor ( see page 34 )
6. Inspect impellor and clean if required ( See Page 34 )
7. Rebuild fan
8. Replace burner box
9. Replace combustion chamber cover
10. Replace manifold ensuring `O` rings on gas valve are securely in place and not
damaged, see drawing C `O` rings 1
11. Remove sealing screw on test nipple,TP1 on gas valve ( see page 33 ) and fit
manometer
12. Turn as many taps on as possible, or get as much water flowing through the
heater as possible
13. Once the flame is stable go through gas pressure setting procedure as per
pages 25 –26
14. Once burner pressures are set, turn off water flow
15. Remove manometer and replace TP1 sealing screw
16. Turn on flow of water and when unit has fired check for any gas leaks.
Care
When the appliance casing, operation panel, and remote controls surfaces become
dirty gently wipe them clean with a soft, damp cloth. Do not use detergents on these
parts.
Filter
The water heater has a filter on the cold water inlet connection. This filter will need to
be cleaned occasionally. How often will be determined by the local water conditions;
contact Rinnai or ask your installer for information.
Isolate the cold water inlet and hot water outlet with the valves near the heater. Re-
lease the pressure in the heater by unscrewing the drain valve. Then remove the fil-
ter, clean it and replace it.