Rinnai FUA-E, Service Manual

Page: 20 / 67

20
Gas Pressure Setting
The working gas pressure on the water heater is electronically controlled and factory set.
Under normal circumstances it
does not require adjustment during installation. Perform
this procedure only if the unit is not operating correctly and all other possible causes for
incorrect operation have been eliminated.
Contact Rinnai before attempting
to alter the gas pressure. Failure to do so could void the warranty.
1. Turn 'OFF' the gas supply.
2. Turn 'OFF' 230V power supply.
3. Remove the front cover from the appliance.
4. Check gas type dip switches no.1 and no. 2
are in the correct position for the type of gas
(Nat. or LPG)* you are using. See Fig. 1
On is in the right hand position, Off is in the
left hand position.
5. Attach pressure gauge to burner test point. (Fig. 2)
6. Turn 'ON' the gas supply.
7. Turn 'ON' 230V power supply.
8. If remote controllers are fitted, turn the unit 'ON' at the
controller and select a maximum delivery temperature.
9. Open a hot water tap fully.
(CAUTION: Ensure
building occupants do not have access to hot water
outlets during this procedure.)
Wait for the unit to
light.
10.Set the Rinnai Infinity to 'Forced Low' combustion by
setting No. 7 dipswitch to 'ON'. (Fig. 3)
off on SW off on SW
1 -Nat. Gas 1 -LPG
2 -Nat. Gas 2 -LPG
3 3
4 4
5 5
6 6
7 7
8 8
off on SW
1
2
3
4
5
6
7
8
Fig. 3
Fig. 1
Fig. 2
* Note:
Simply changing the position of the dip switches will not convert the unit from
one gas type to the other. The conversion procedure requires a change of
injector manifold. Contact Rinnai or your supplier.