Gas Conversion And Pressure Adjustment - Rinnai Infinity 20 External Operation And Installation Manual

3.2 GAS CONVERSION AND PRESSURE ADJUSTMENT

Only qualified professionals are authorized to carry out the operations described.
IMPORTANT
The product warranty does not cover any alterations due to non-qualified personnel.
The min and max gas operating pressures are factory pre-set: under normal circumstances any
adjustment is not required during installation.
The gas conversion procedure is made of three steps:
•
gas manifold change;
•
selection of the different type of gas on PCB;
•
verify and adjustment of the min and max gas pressures.
1. Turn off the gas and power and remove the front cover. Make sure that
dip switches SW1 and SW3 on PCB are set to 'Off' position (ignore SW2
and SW4 set position).
2. Disconnect the ignitor from manifold ("I" - Fig.1).
3. Replace the gas manifold with the new suitable component (the manifold
is fastened by the screws indicated with "Y" - Fig.1). Manifold's gas type
can be checked by the letter marked as in Fig.2.
4. Turn on the power and check the gas type on PCB entering in the
programming mode by pressing PB2 until the LED display of PCB shows
1: the current gas type will be dispalyed shortly afterwards.
5. Press PB4 to modify gas type accordingly to new gas type: A=Propane,
b=LPG, C=NG, d=air/propane.
6. Exit programming mode pressing PB2 until the LED digital display goes
blank.
7. Attach the digital manometer to the test point located on the gas valve
(Fig.3).
8. Turn on the gas. If remote controllers are fitted, turn the unit on at the
kitchen controller: select the maximum delivery temperature and fully
open all hot water taps including the shower. Let the water run for a short
period to allow the flow rate and temperature to stabilise. Ensure the
building occupants do not have access to the hot water outlets during
this procedure.
9. Set the water heater to forced low combustion by pressing PB5 until
the LED display shows "L". Check the gas pressure at manometer and
adjust it if required: to raise the gas pressure press PB3; to lower it press
PB4.
10. Set the water heater to forced high combustion by pressing PB5 until the
LED diplay shows "H". Check the gas pressure at manometer and adjust
it if required: to raise the gas pressure press PB3; to lower it press PB4.
11. Set the water heater back to normal combustion by pressing PB5 until
the LED display goes blank.
12. Close the hot water taps. Remove the manometer and replace the test
point screw.
13. Operate and check for gas leaks at the test point. Set dip switches SW1 and SW3 on PCB to original position.
14. Fix the front cover of the appliance and update the dataplate to the new gas type.
Gas pressures must be adjusted when front panel is removed and combustion mode is forced.
When measuring combustion or gas consumption, be sure, instead, that the water heater operates in normal mode,
front panel is closed and
- (Max) remote controller set 60°C + max flowrate (full open shower and taps)
- (Min) remote controller set 37°C + 3l/min flowrate.
(When combustion is in forced mode, fan is limited to 95% of normal capacity: then combustion is bad)
Y
I
Fig.1
A = LPG
B = NG
Fig.2
Fig.3
33