Ariston MICROCOMBI 23 MFFI Servicing Instructions - Page 8
Browse online or download pdf Servicing Instructions for Boiler Ariston MICROCOMBI 23 MFFI. Ariston MICROCOMBI 23 MFFI 28 pages. Wall-hung electronic ignition gas combination boiler ariston microcombi 23 mffi/ microcombi 27 mffi
Also for Ariston MICROCOMBI 23 MFFI: User Manual (20 pages), Installation Instructions Manual (25 pages), End User Manual (8 pages), Manual (4 pages)
Print Page
1.4
S
ERVICING AND
G
V
OF THE
AS
1.4.1 Setting the gas pressures
1
B
A
2
D
C
3
4
8
R
EMOVAL
ALVE
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
2. To do this, loosen the screw "A".
3. To check the pressure supplied by the gas valve to the burner, loosen the
4. Push the On/Off button to "ON" position -green light- and push the Heating
5. To set the minimum power, disconnect a supply terminal from the modureg
6. When you have completed the above operations, turn off the
Setting the maximum heating circuit power
7. To set the maximum heating circuit power, push the On/Off button to the
8. Remove the inspection panel of the P.C.B. and fit a small cross-head
E
9. Turn off the boiler by placing the main switch to the "OFF" position.
Setting pressure for soft ignition.
F
for natural gas.
Fit the pipe of the pressure gauge to the inlet 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.
screw "C". Fit the pipe of the pressure gauge to the pressure outlet test
point of the gas valve "D".
Disconnect the compensation pipe either from the gas valve or from the
sealed chamber.
button to "ON" position -green light-
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
and adjust screw "F".
Turn the screw clockwise to increase the pressure and coun-
ter-clockwise
to
decrease
pressure gauge) corresponding to the minimum power (see T
9).
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.
"ON" position -green light- and push the Heating button and set the time
clock and any external controls to the "ON" position -green light. Turn the
knob of the heating thermostat clockwise to maximum.
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 charts shown in page 9.
Disconnect the detection electrode connection close to the P.C.B. (F
1.14).
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.
Recommended pressure for
soft-light ignition
the
pressure
NATURAL GAS (G20)
BUTANE GAS (G30)
8 mbar
16 mbar
A page 9)
ABLE
(displayed
on
the
A page
ABLE
.
IG
PROPANE GAS (G31)
16 mbar