40
– remove the screws (3) securing the control panel (4)
– move the panel (4) upwards (a) but keeping it in the side
guides (5) to the end of travel
– bring it forwards and down (b) until it is horizontal
3
a
b
5
4
Fig. 42
– isolate the gas cock
– loosen the screw of the "mains pressure" point (6) and con-
nect a pressure gauge
6
Fig. 43
– open the gas cock
– power the boiler by setting the main switch to "ON"
– press the button
s
until "SUMMER" mode
l
has been se-
lected
– press and hold down the buttons
o
and
>
at the same time
for approximately 10 seconds until the message “Hi” ap-
pears on the display together with the flashing symbols
l
and
n
–
to dissipate the heat , tun on one or more DHW taps
– press the button
>
to make the boiler operate at maximum
power "Hi" and check that the mains gas pressure value on
the pressure gauge is correct
– disconnect the pressure gauge, carefully close the pressure
point (6), test for gas tightness, put the control panel back to
the original position and refit the front panel (2). Now con-
duct a flue gas analysis as detailed in APPENDIX 2
– take a reading of the combustion data and measure the
combustion efficiency
– press the button
<
to make the boiler operate at minimum
power "Lo". The message
"Lo"
will appear on the display
together with the flashing symbols
l
and
n
– take the combustion data reading
– press the button
s
to exit the "Chimney sweep Procedure”.
The boiler water delivery temperature will appear on the
display
– close the hot water taps that were previously opened
– ensure the required information is recorded in the Gas Boil-
er System Commissioning Checklist (Benchmark).
Gas supply pressure
Type of gas
G20
G31
Pressure (mbar)
20
37
NOTE: There are negligeable losses of working gas pressure
attributable to the boiler as the gas cock is connected directly
to the gas valve.
7.7
Gas conversion
MIA-30
can work with G20 or G31 without the need for any
mechanical conversion. Simply select parameter
"tS 0.3"
(see
"Parameter setting and display") and set the type of gas to be
used, then carry out the entire appliance "Automatic self-cal-
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