27
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 UK 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 switch no.1 of SW2 (fig. 1) is
in the correct position for the type of gas
(Nat. or LPG) you are using. (SW2 is top set
of switches.)
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 master controller, select a
maximum delivery temperature and open a
hot water tap fully.
(CAUTION: Ensure
building occupants do not have access to
hot water outlets during this procedure.)
9. Set the appliance to 'Forced Low'
combustion by setting No. 3 dipswitch of the
bottom set of dip switches (SW1) to 'ON'.
(fig. 3)
10.Check the burner test point operating
pressure.
High Pressure
Potentiometer
Dip.SW2
Dip.SW1
1
2
3
4
4321
ON
ON
fig.1
fig.2
fig.3
No.1:ON
1
2
3
4
1
2
3
4
No.1:OFF
Nat. Gas
Propane
Dip.SW2
ON
ON
Burner test point
1
2
3
4
Dip.SW1
ON
