70
– turn the
encoder to select
“En. Chimney Sweeper”
(En.
Chimney Sweeper) row and press the
click
encoder to enter
the modifiable data area
– turn the
encoder to set the value to
“Hi”
, press the
click
encoder to run the boiler at maximum power (Qmax)
Chimney sweeper
En. Chimney Sweeper
Hi
Burner power output
--%
Chimney sweeper
En. Chimney Sweeper
OFF
Burner power output
--%
Fig. 135
– check that the gas supply pressure is as shown in the table
below
Type of gas
G20
G31
Pressure (mbar)
20
37
– measure the CO
2
and check that it corresponds to the value
in the table. If it does not correspond, adjust the "maximum
power adjustment screw" (6) on the gas valve until you obtain
the CO
2
value shown in the table. Take any other necessary
readings.
Once any necessary adjustments and readings have been made:
– turn the
encoder to select
“En. Chimney Sweeper”
(En.
Chimney Sweeper) row and press the
click
encoder to enter
the modifiable data area
– turn the
encoder to set the value to
“Low”
; press the
click
encoder to run the boiler at minimum power (Qmin)
Chimney sweeper
En. Chimney Sweeper
OFF
Burner power output
--%
Chimney sweeper
En. Chimney Sweeper
Low
Burner power output
--%
Fig. 136
– measure the CO
2
and check that it corresponds to the value in
the table. If it does not correspond, adjust the "minimum power
adjustment screw" (7) on the gas valve until you obtain the CO
2
value shown in the table.
CO
2
values
MURELLE.HT
CO
2
(G20)
CO
2
(G31)
Qmax
(% ± 0,2)
Qmin
(% ± 0,2)
Qmax
(% ± 0,2)
Qmin
(% ± 0,2)
25
9,3
8,8
10,0
10,0
30
9,0
9,0
10,0
10,0
35
9,5
9,0
10,3
10,3
m
CAUTION
This procedure MUST BE PERFORMED after replacing
the gas valve following a fault.
7.8
Gas conversion
MURELLE.HT
models can be converted from operating with G20 to
G31 by installing the “Nozzle kit for G31” code 5185138 (for
MUR-
ELLE.HT 25
), 5185139 (for
MURELLE.HT 30
) and code 5185140 (for
MURELLE.HT 35
) to be ordered separately from the boiler.
m
CAUTION
The maintenance interventions described must ONLY
be carried out the professionally qualified personnel.
a
WARNING
Before carrying out any interventions described:
– set the main system switch to "OFF"
– close the gas valve
– make sure that no hot parts inside the appliance are
touched.
OFF
Fig. 137
7.8.1
Preliminary operations
To carry out the conversion:
– remove the screws (1), pull the front panel (2) forwards and
release it from the top by lifting it
1
2
Fig. 138
Summary of Contents for 8115101
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