40
16.
Gas Adjustments
When converting 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
M
AXIMUM
B
URNER
P
RESSURE
T
ABLE
page 41).
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 M
INIMUM
B
URNER
P
RESSURE
T
ABLE
page 41).
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 potentiometer P1 (see page 38). 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 41.
Turn off the boiler by placing the main switch to the "OFF" position.
Adjusting the ignition output
The potentiometer P2 (Fig. 15.6) on the PCB permits this adjustment
(see Operational Adjustments on page 38).
Disconnect the detection electrode (see section 18.4.4).
Start the boiler and during the ignition sequence adjust the P2
potentiometer until the gas pressure reads the required gas pressure
as per the table on page 41.
C
D
F
IG
. 16.2
E
F
F
IG
. 16.3
F
IG
. 16.4
C
E
F
D
D1
F1
A
A
B
B
F
IG
. 16.1
Summary of Contents for GENUS 30 Plus
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