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3.27 SPECIFIC INFORMATION FOR CORRECT APPLIANCE INSTALLATION IN COMMON
PRESSURISED FLUE SYSTEMS (C
The appliance is factory equipped with a flue gas non-return valve located downstream of the fan, this device, given the impor-
tance of its correct operation, must have its installations C
must be replaced in case of cuts in the moving parts.
For safety reasons, the flue gas non-return valve (inside the appliance) must be replaced after
10 years of operation.
Before removing the sealing elements of the sealed chamber, using the flue gas analyser and with the appliance off, check that
there are no traces of combustion products in the flue gas sample point.
The presence of combustion products indicates that the non-return valve on the flue gas (in appliance exhaust) is not properly closed, in
which case it is appropriate to check the absence of flue gas even in the sealed chamber (analysis via air sample point).
If malfunctions are detected on the flue gas non-return valves, especially on the discharge valve, in the absence of a shut-off flue
adjusting device at the coupling point of the flue in the pressurised collective flue, it will be necessary to turn off all the boilers
connected to the pressurised collective flue itself, or make sure to intercept the connection point to avoid the dispersion of com-
bustion products into the environment.
Only then proceed to verify the components, making sure that the non-return valve siphon on the flue gas (on the exhaust) (Fig.
40) is full and replacing them if malfunctioning or damaged.
- C
)
10
12
and C
checked on an annual basis, and the active rubber element
(10)
(12)
92
119
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