Service manual

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10. Set the Rinnai to 'Forced Low' combustion by setting No.7 dip switch
of SW1 to 'ON'. (Fig. 3)
11. Check the burner test point operating pressure.
12. Remove rubber access plug and adjust the regulator screw on the
modulating valve (Fig. 4) as required to the pressure above.
Replace rubber access plug and seal it shut.
13. Set the Rinnai to 'Forced High' combustion by setting No.7 and
No.8 dipswitches to 'ON' (Fig.5). Ensure maximum water flow.
14. Check the burner test point pressure.
15. Adjust the High Pressure Potentiometer on the Printed Circuit Board
SW1 (Fig. 6) to the pressure shown above. The potentiometer is very
sensitive, turn no more than a few degrees at a time; then let the
pressure settle down before turning it more.
16. IMPORTANT: Set dip switch No.7 and No.8 of SW1 to 'OFF' to return
the appliance to 'Normal' combustion.
17. Close hot water tap and turn ‘OFF’ the gas supply and 230V power
supply.
18. Remove pressure gauge and replace sealing screw.
Turn ‘ON’ the gas supply and power.
19. Operate unit and check gas leaks.
20. Replace the front cover of the appliance.
GAS PRESSURE SETTING
MAX GAS HD50e HD70e
26i
HD50i
HD70i
NG G20 6.81 7.95 9.35 7.95
LPG G31 11.2 9.25 11.1 9.25
(pressures in mbar)
LOW GAS HD50e HD70e
26i
HD50i
HD70i
NG G20 1.29 1.83 1.75 1.86
LPG G31 2.21 2.34 2.36 2.22
(pressures in mbar)
Fig. 6
Fig. 3
Fig. 4
Fig. 4
Fig. 5