23
925.220.4 - EN
*/4536$5*0/41&35"*/*/(505)&*/45"--&3
C) Pressure adjusting device setting (Figure 13)
r DPOOFDUUIFQPTJUJWFQSFTTVSFUFTUQPJOUPGBEJGGFSFOUJBM QPTTJCMZXBUFSPQFSBUFENBOPNFUFSUPUIFHBTWBMWFQSFTTVSF
test point (
Pb
); 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 me-
asurement can be carried out by connecting the manometer to the pressure test point (
Pb
) after removing the sealed
chamber front panel);
If you measure the pressure of burners in a different way you may obtain an altered result in that the low pressure created
in the sealed chamber by the fan would not be taken into account.
C1) Adjustment to nominal heat output
r PQFOUIFHBTUBQ
r QSFTT
button (figure 1) and set the boiler in winter mode;
r PQFOBIPUXBUFSUBQUPSFBDIBNJOJNVN
10 l/min
flow rate or ensure that maximum heating requirements are set;
r DIFDLUIBUCPJMFSGFFEJOHEZOBNJDQSFTTVSFBTNFBTVSFEBUUIFJOMFUHBTWBMWFQSFTTVSFUFTUQPJOU
Pa
) is correct (
37
mbar
for propane gas
G.31
,
20 mbar
for natural gas
G20
);
r SFNPWFUIFNPEVMBUPSDPWFS
r BEKVTUUIFUVCFCSBTTTDSFX
a
) figure 14 to obtain the pressure settings shown in table 1;
C2) Adjustment to reduced heat output
r EJTDPOOFDUUIFNPEVMBUPSGFFEJOHDBCMFBOEVOTDSFXUIF
b
) screw to reach the pressure setting corresponding to
reduced heat output (see table 1);
r DPOOFDUUIFDBCMFBHBJO
r àUUIFNPEVMBUPSDPWFSBOETFBM
C3) Final checks
r BQQMZUIFBEEJUJPOBMEBUBQMBUFTQFDJGZJOHUIFUZQFPGHBTBOETFUUJOHTBQQMJFE
Figure 13
SIT valve - mod. SIGMA 845
Honeywell valve - mod. VK 4105 M
0904_0701
