Ariston microGENUS 27 MFFI Onderhoudsinstructies - Pagina 8
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1.4
S
ERVICING AND
G
V
OF THE
AS
ALVE
Setting the gas pressures
1
B
A
2
D
C
3
4
8
Supplied By www.heating spares.co Tel. 0161 620 6677
R
EMOVAL
Setting the minimum and the maximum power of the boiler
1. Check that the supply pressure to the gas valve is a minimum of 20 mbar
for natural gas.
2. To do this, remove the screw "A".
Fit the pipe of the pressure gauge to the pressure connection of the gas
valve "B".
When you have completed this operation, replace the screw "A" securely
into its housing to seal off the gas.
3. To check the pressure supplied by the gas valve to the burner, remove the
screw "C". Fit the pipe of the pressure gauge to the pressure outlet of the
gas valve "D".
Disconnect the compensation pipe either from the gas valve or from the
sealed chamber.
4. Set the On/Off button to position < I > and the "summer/winter" switch to
the winter position.
To set the maximum power, turn on the hot water tap and allow the hot
water tap to run at a rate of about 8 litres/minute so that the main burner
VG001Aa
lights.
Adjust nut "E" on the modureg to set the gas pressure (displayed on the
pressure gauge) corresponding to the maximum power (see T
9).
5. To set the minimum power, disconnect a supply terminal from the modureg
and adjust screw "F".
Turn the screw clockwise to increase the pressure and coun-
ter-clockwise
pressure gauge) corresponding to the minimum power (see T
9).
6. 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.
VG001Ac
Setting the maximum heating circuit power
7. To
On/Off button to position < I > and the "summer/winter" switch to winter
position.
Turn the knob of the heating thermostat clockwise to maximum.
8. Remove the inspection panel of the P.C.B. and fit a small cross-head
E
screwdriver in to the right hand potentiometer. 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 diagrams shown in page 10.
9. Turn off the boiler by placing the main switch to the "Off" position.
Setting pressure for soft ignition.
Disconnect the detection electrode connection from the P.C.B..
VG001Ab
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
connection to the P.C.B.
F
NB.: It may be necessary to reset the flame failure reset a number of times
during this operation.
VG001Ad
to
decrease
set
the
maximum
NATURAL GAS (G20)
Recommended pressure for
soft-light ignition
8 mbar
the
pressure
(displayed
heating
circuit
power,
BUTANE GAS (G30)
PROPANE GAS (G31)
16 mbar
16 mbar
"A" page
ABLE
on
the
"A" page
ABLE
place
the
B063