28
4.2
A
DJUSTING THE
G
AS
P
RESSURES
Setting the minimum and the maximum power of the
boiler
1. Check that the supply pressure and dynamic working
pressure to the gas valve is a minimum of 20 mbar for
natural gas.
2. To do this, loosen the screw “A”.
Fit the pipe of the pressure gauge to the inlet pressure
connection of the gas valve
“B” and 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).
3. 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.
4. Turn the On/Off knob to “ON” position -green light- 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
T
ABLE
A
Page 27).
5. To set the minimum power, disconnect a supply
terminal
“F1” from the modureg and adjust screw “F”
(ensure that the 10mm nut is held in position). Turn the
screw clockwise to increase the pressure and anti-
clockwise to decrease the pressure (displayed on the
pressure gauge) corresponding to the minimum power
(see
T
ABLE
A Page 27).
6. When you have completed the above operations, turn
off the hot water tap, reconnect the supply terminal to
the modureg on the gas valve, reconnect the
compensation pipe and replace the cap on the screw
of the modureg.
A
A
B
B
C
D
1
2
E
F
3
4
B
C
E
F
D
D1
F1
A
