29
When adapting to a gas different from the one for which the boiler is equipped, you should replace the parts delivered with the
conversion kit, and make the gas valve adjustments as described below:
Setting the minimum and the maximum power of the boiler
Check that the supply pressure and dynamic pressure to the gas valve is a
minimum of 20 mbar for natural gas. To do this, loosen the screw
“A”.
Fit the pipe of the pressure gauge to the inlet pressure connection of the gas valve
“B” check for the correct standing pressure, then operate the appliance and check
for the correct working pressure.
When you have completed this operation, replace the screw
“A” securely into its
housing to seal off the gas (check for tightness).
To check the pressure supplied by the gas valve to the burner, loosen the screw
“C”. Fit the pipe of the pressure gauge to the pressure outlet test point of the gas
valve “D”.
Disconnect the compensation pipe “D1” either from the gas valve or from the
sealed chamber.
Turn the boiler on, and ensure that the hot water temperature control knob is set to
maximum. Turn on the boiler by running a hot water tap.
Adjust the 10mm nut
“E” on the modureg to set the maximum gas pressure, turn
the nut clockwise to increase and anti clockwise to decrease the pressure until the
required pressure is achieved (see MAXIMUM BURNER PRESSURE TABLE page 30).
To set the minimum power, disconnect a supply terminal
“F1” from the modureg
and adjust screw
“F” (ensure the 10mm nut is held in position). Turn the screw
clockwise to increase the gas pressure and counter-clockwise to decrease the gas
pressure (displayed on the pressure gauge) corresponding to the minimum power
(see
MINIMUM BURNER PRESSURE TABLE page 30).
When you have completed the above operations, turn off the hot water tap, re-
connect the supply terminal to the modureg on the gas valve and replace the cap
on the screw of the modureg.
Setting the maximum heating circuit power
To set the maximum heating circuit power, turn the boiler on and turn the Central
Heating temperature control knob to maximum, ensuring all extermal controls are
calling for heat.
Remove the inspection panel of the P.C.B. and fit a small cross-head screwdriver
in to the right hand potentiometer (see page 26). Turn clockwise to increase the
pressure or counter-clockwise to reduce the pressure. Adjust the setting to the
required heating pressure value (displayed on the pressure gauge), as indicated in
the tables shown on page 30.
Turn off the boiler by placing the main switch to the "OFF" position.
Note : when adjusting the minimum output in G30/G31 on 24 FF boilers, you
should place the metal plate supplied with the boiler and the gas changing
kit on the manifold.
(Fig. 40 page 30)
Important: do not forget to remove this plate once the adjustment has been
completed. (the tab prevents the boiler from being reassembled).
Adjusting the ignition output
The potentiometer P2 (Fig. 33) on the PCB permits this adjustment (12.7 kW -
MX2 24 FF and 16 kW - MX2 30 FF) (
see Settings on page 25).
Disconnect the detection electrode (see section 22.2.3 - Fig. 50).
Start the boiler and during the ignition sequence adjust the left hand potentiometer
until the gas pressure reads the required gas pressure as per the table below.
Once the gas pressure is set turn off the boiler and re-connect the detection
electrode.
NB.: It may be necessary to reset the flame failure reset a number of times during
this operation.
Remove the pipe from the test point and tighten the screw “
C” to the pressure
test point in order to seal off the gas. Carefully check the pressure test points for
gas leaks (valve inlet and outlet), reconnect the compensation pipe
D1.
IMPORTANT!
Whenever you disassemble and reassemble the gas connections, always check
for leaks using a leak detection fluid.
NOTE: ALWAYS CHECK THE GAS RATES FOLLOWING ADJUSTMENT.
20
Setting the Gas Pressures / Gas Type Conversion
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