for the technician
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2
3
GAS VALVE SIT 845
1 = Pressure tapping point
for gas outlet
2 = Pressure tapping point
for gas inlet
3 = Vent (mod. SE)
Prefilling of the DHW expansion
vessel
— Measure the well pressure or get informed about its value;
— Close the tap installed on the boiler cold water inlet;
— Open the hot water tap in order to unload the remaining
pressure, and close it;
— Release the protection tap [1] of the expansion vessel’s loading
inlet and load the vessel with air with the same pressure of the
water network;
— Reopen gradually the installed tap on the boiler cold water
inlet.
Preliminary GAS
checkings
All boilers are tested and factory set during
manufacture; however, it is advisable to check that the
gas type and the burner pressures are correct. On the
contrary, follow the procedures described in this section.
To make burner pressures checking, insert pressure
gauge sensors in the gas valve pressure tapping points
(see figure).
Remark: In order to check that pressure and gas input
are enough to guarantee the correct functioning of
the appliance , make measurements while burner
is on.
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