Ariston microCombi Instrucciones de mantenimiento - Página 8
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1.4
S
ERVICING AND
G
V
OF THE
AS
ALVE
1.4.1 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, loosen the screw "A".
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.
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 either from the gas valve or from the
sealed chamber.
4. Push the On/Off button to "ON" position -green light- and push the Heating
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
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.
Setting the maximum heating circuit power
7. To set the maximum heating circuit power, push the On/Off button to the
"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.
8. Remove the inspection panel of the P.C.B. and fit a small cross-head
screwdriver in to the right hand potentiometer. Turn clockwise to increase
the pressure or counter-clockwise to reduce the pressure. Adjust the
E
setting to the required heating pressure value (displayed on the pressure
gauge), as indicated in the charts shown in page 9.
9. Turn off the boiler by placing the main switch to the "OFF" position.
Setting pressure for soft ignition.
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.
F
to
decrease
the
NATURAL GAS (G20)
Recommended pressure for
8 mbar
soft-light ignition
ABLE
pressure
(displayed
ABLE
BUTANE GAS (G30)
PROPANE GAS (G31)
16 mbar
16 mbar
A page 9)
on
the
A page
.
IG