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b
The maximum recirculated value allowed in wind conditions is 10%.
b
The maximum permissible pressure difference (25 Pa) between the combustion
products inlet and the air outlet of a collective flue can not be exceeded when-
1 boiler work at the maximum nominal heat output and 1 boiler within minimum
temperature allowed by the checks.
b
The collective smoke pipe must be adequate for an overpressure of at least 200 Pa.
b
The collective flue must not be equipped with a wind-proofing device.
At this point it is possible to install the curves and extensions, available as accessories,
depending on the type of installation desired.
The maximum permissible lengths of the flue pipe and the air intake pipe are given in the
section "2.7 Flue gas exhaust and combustion air suction".
With C(10) installation, in any case, report the number of fan speed (rpm) on the
label placed next to the data plate.
2.9
Filling the heating system and eliminating air
A
D
C
Note: even if the boiler is fitted with a semi-automatic filling device, the first filling operation
must be carried out by turning the filler tap (outside the boiler) with the boiler OFF.
Note: each time the boiler is powered up, the automatic venting cycle is carried out.
Note: the presence of a water alarm (40, 41 or 42) does not allow the venting cycle to be
carried out. The presence of a domestic hot water request during the venting cycle interrupts
the venting cycle.
Once the hydraulic connections have been made, fill the heating system as follows:
- set the boiler to OFF
- open the plug of the air vent valve (D) by two or three turns to allow the continuous
bleeding of the air, and leave the valve cap (D) open
- open the de-aeration tap (A)
- turn on the filling tap (outside the boiler)
- wait until the water comes out continuously from the de-aeration tap (A), then close it
- wait for the pressure to increase: check that it reaches 1-1.5 bar; then close the system
filling tap (outside the boiler).
Note: if the mains pressure is less than 1 bar, keep the system filling tap (outside the
boiler) open during the venting cycle and close it once it has finished.
- To start the vent cycle shut of the electrical power for a few seconds; connect the power
again leaving the boiler OFF. Check that the gas tap is closed.
- At the end of the cycle, if the circuit pressure has dropped, open the filling tap (outside
the boiler) again to bring the pressure back up to recommended levels (1-1.5 bar)
The boiler is ready after the vent cycle.
- Remove any air in the domestic system (radiators, zone manifolds, etc.) using the bleed
valves.
- Once again check that the system pressure is correct (ideally 1-1.5 bar) and restore the
levels if necessary.
- If air is noticed when operating, repeat the vent cycle.
- Once the operations are finished, open the gas tap and ignite the boiler.
At this point it is possible to carry out any heat request.
2.10
Before draining, set the boiler to OFF and shut off the electrical supply setting the system's
main switch to "off".
- Close the heating system's taps (if present).
- Connect a pipe to the system discharge valve (C), then manually loosen it to let the
water flow out.
- Once the operations have been completed, remove the pipe from the system discharge
valve (C) and close it again.
2.11
When the boiler is first started the siphon for collecting the condensate is empty. When
eliminating air form the siphon fills.
- Slowly open the de-aeration tap (A) and leave it open until the amount of water contained
in the siphon reaches the maximum level.
- Close the de-aeration tap (A).
- Check that the condensate siphon connection is tight.
- Check that the system pressure has not dropped below 1 bar. If necessary, fill the system
(see "2.9 Filling the heating system and eliminating air").
Repeat this operation during maintenance work.
CHECK THAT THE CONDENSATE DRAIN OUTLET SIPHON CONTAINS WATER, IF IT
WAS NOT FILLED PROCEED AS DESCRIBED ABOVE.
max water
level
(limit)
Draining the heating system
Condensate siphon
ENGLISH
EN
7
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