Rinnai HD70e - Manual (Page 27)

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 switches no.1 and no. 2 of
SW2 (fig. 1) are 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. 2 dipswitch of the bottom set of
dip switches (SW3) to 'ON'. (fig 3)
10.Check the burner test point operating
pressure.
test pt. screw
fig.1
fig.1
fig.2
fig.3
ON
N.G.
1
2
O
F
F
ON
SW2 SW2
SW3
Prop.G
1
2
2
3
O
F
F
O
F
F
ON
SW2
SW3