46
7113868.01 - en
INSTRUCTIONS FOR FITTERS
The authorised Technical Assistance Service can convert this boiler to natural gas (
G. 20
) or liquid gas (
G. 30, G. 31
).
18. GAS CONVERSION
TFDUJPO
r PQFOBIPUXBUFSUBQUIBUDBOQSPWJEFBáPXSBUFPGBUMFBTUMJUSFTBNJOVUFPSNBLFTVSFUIFSFJTNBYJNVNIFBU
EFNBOE
r DIFDLUIBUUIFCPJMFSGFFEJOHEZOBNJDQSFTTVSFBTNFBTVSFEBUUIFJOMFUHBTWBMWFQSFTTVSFUFTUQPJOU 1B 'JHVSFB
is correct (
30 mbar
for
butane
gas,
37 mbar
for
propane
gas or
20 mbar
for
methane
HBT
r SFNPWFUIFNPEVMBUPSDPWFS
r BEKVTUUIFUVCFCSBTTTDSFXUPPCUBJOUIFQSFTTVSFTFUUJOHTTIPXOJOUBCMF
C2) Adjustment to reduced heat output:
r EJTDPOOFDUUIFNPEVMBUPSGFFEJOHDBCMFBOEVOTDSFXUIFTDSFXUPSFBDIUIFQSFTTVSFTFUUJOHDPSSFTQPOEJOHUPSFEVDFE
IFBUPVUQVU TFFUBCMF
r SFDPOOFDUUIFDBCMF
r àUUIFNPEVMBUPSDPWFSBOETFBM
C3) Final checks
r BUUBDIUIFBEEJUJPOBMQMBUFTVQQMJFEXJUIUIFUSBOTGPSNFSTQFDJGZJOHUIFUZQFPGHBTBOEUIFDBMJCSBUJPOQFSGPSNFE
Carry out the following operations:
"SFQMBDFUIFNBJOCVSOFSOP[[MFT
B) change the modulator voltage
C) new max. and min. calibration of the pressure regulator.
A) Replace the burner injectors
r DBSFGVMMZQVMMUIFCVSOFSPGGJUTTFBU
r SFQMBDF UIF CVSOFS JOKFDUPST NBLJOH TVSF UP GVMMZ UJHIUFO
them to prevent gas leaks. Injector diameters are specified
in table 2.
Replacing the diaphragm nozzle
GPSNPEFMTJBOE'J
r SFNPWFUIFHBTJOMFUIPTF PG'JHVSFC
r SFQMBDFUIFEJBQISBHNOP[[MFNPVOUFEPOUIFHBTWBMWF
r QVUCBDLUIFHBTJOMFUIPTF
B) Change the modulator voltage
r
set parameter
F02
according to the gas used, as descri-
bed in section
20.
C) Calibrate the pressure regulator
r DPOOFDUUIFQPTJUJWFQSFTTVSFUFTUQPJOUPGBEJGGFSFOUJBM
pressure gauge (possibly water-operated) to the gas valve
pressure test point (
Pb
) (Figure 12a). For models 240 i/Fi
use the pressure tap (3) in the gas inlet hose (figure 12b).
Connect, for sealed chamber models only, the negative
pressure test point of the manometer to a “
T
” fitting in
order to join the boiler adjusting outlet, the gas valve
adjusting outlet (
Pc
) and the manometer. (The same
measurement can be made by connecting the pressure
gauge to the pressure test point (
Pb
) after removing the
GSPOUQBOFMPGUIFTFBMFEDIBNCFS
Measuring burner pressure using methods other than
those described could lead to incorrect results as the low
pressure created by the fan in the sealed chamber would
not be taken into account.
C1) Adjustment to nominal heat output:
r PQFOUIFHBTDPDL
r QSFTT UIF CVUUPO
(and set the boiler in winter mode
Valve SIT
mod. SIGMA 845
Figure 12a
9912221500
Pc
Pb
Pa
0206_0501
Figure 12b (models 240 i - 240 Fi)