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3.10 Draining the domestic hot water system
When there is risk of frost, the domestic hot water system must be emptied
in the following way:
- close the main tap of the water mains
- open all the hot and cold water taps
- drain the lowest points.
3.11 Bleeding the air from the heating circuit and boiler
During the initial installation phase, or in the event of extraordinary main-
tenance, you are advised to perform the following sequence of operations:
1.
Use a CH11 spanner to open the manual air vent valve located above
the air distribution box (fig.18). Connect the tube (supplied with the
boiler) to the valve, so the water can be drained into an external con-
tainer.
2.
Open the system filling tap located on the hydraulic unit and wait until
water begins to drain out of the valve.
3.
Switch on the electricity supply to the boiler, leaving the gas tap turned
off.
4.
Activate a heat request via the room thermostat or the remote control
panel, so that the 3-way valve goes into heating mode.
5.
Activate a DHW request as follows:
instantaneous boilers: open a tap, for 30 seconds every minute so
that the three-way valve switches from heating to domestic hot water
and vice versa about ten times. In this situation, the boiler will go into
alarm mode due to the absence of gas, so it must be reset every time
this happens.
heat-only boilers connected to an external storage tank: activate the
thermostat on the storage tank;
6.
Carry on with the sequence until only water leaks out of the manual
air vent valve, and the air flow has stopped. Close the manual air vent
valve.
7.
Check the system pressure level is correct (the ideal level is 1 bar).
8.
Turn off the system filling tap.
9.
Turn on the gas tap and ignite the boiler.
3.12 Flue gas discharge and air suction
Observe local legislation regarding flue gas discharge.
Flue gases are discharged from a centrifugal fan located inside the combus-
control board
tion chamber and the
correctly. The boiler is supplied without the flue gas discharge/air suction kit,
since it is possible to use the accessories for appliance with a forced draught
sealed chamber that better adapts to the installation characteristics.
For flue gas extraction and the restoration of boiler combustion air, it is essen-
tial to only use certified piping. Connection must be carried out correctly as in-
dicated in the instructions supplied as standard with the flue gas accessories.
Multiple appliances can be connected to a single smoke pipe provided that
each is a sealed chamber-type appliance.
The boiler is a Type C appliance (sealed chamber), and must therefore
have a safe connection to the flue gas discharge pipe and to the combus-
tion air suction pipe; these both carry their contents outside, and are es-
sential for the operation of the appliance.
POSSIBLE OUTLET CONFIGURATIONS (FIG. 24)
B23P/B53P Suction indoors and discharge outdoors
C13-C13x Discharge via concentric wall outlet. The pipes may leave the
boiler independently, but the outlets must be concentric or sufficiently close
together to be subjected to similar wind conditions (within 50 cm)
C23 Discharge via concentric outlet in common smoke pipe (suction and
discharge in the same pipe)
C33-C33x Discharge via concentric roof outlet. Outlets as for C13
C43-C43x Discharge and suction in common separate smoke pipes, but
subjected to similar wind conditions
C53-C53x Separate discharge and suction lines on wall or roof and in ar-
eas with different pressures. The discharge and suction lines must never
be positioned on opposite walls
C63-C63x Discharge and suction lines using pipes marketed and certified
separately (1856/1)
C83-C83x Discharge via single or common smoke pipe and wall suction
line
C93-C93x Discharge on roof (similar to C33) and air suction from a single
existing smoke pipe
constantly checks that this is working
"FORCED OPEN" INSTALLATION (TYPE B23P/B53P)
Flue gas discharge pipe ø 80 mm (fig. 20)
The flue gas discharge pipe can be directed to the most suitable direction
according to installation requirements. For installation, follow the instruc-
tions supplied with the kit.
In this configuration, the boiler is connected to the flue gas discharge pipe
(ø 80 mm) through an adaptor (ø 60-80 mm).
In this case, the combustion air is picked up from the boiler instal-
lation room (which must be a suitable technical room with proper
ventilation).
Uninsulated flue discharge outlet pipes are potential sources of
danger.
Arrange the flue gas discharge pipe so it slopes by 1% towards the
boiler.
The boiler automatically adapts the purging to the type of installation
and the length of the pipe.
maximum length of the flue gas
discharge pipe ø 80 mm
70 m
*"Straight length" means without bends, drainage terminals or joints.
"SEALED" INSTALLATION (TYPE C)
The boiler must be connected to concentric or twin flue gas discharge
pipes and air suction pipes, both leading outdoors. The boiler must not be
operated without them.
Concentric pipes (ø 60-100 mm) (fig.21)
The concentric pipes can be placed in the most suitable direction accord-
ing to installation requirements, complying with the maximum lengths in-
dicated in the table.
Arrange the flue gas discharge pipe so it slopes by 1% towards the
boiler.
Non-insulated outlet pipes are potential sources of danger.
The boiler automatically adapts the purging to the type of installation
and the length of the pipe.
Do not obstruct or choke the combustion air suction pipe in any
way.
For installation, follow the instructions supplied with the kit.
Horizontal
straight length *
concentric pipe ø 60-100 mm
5.85 m
Vertical
straight length *
concentric pipe ø 60-100 mm
6.85 m
*"Straight length" means without bends, drainage terminals or joints.
If the boiler must be installed with drainage below, use the special elbow
(kit available on request – see Parts Catalogue).
In this type of installation, the inner pipe of the elbow must be cut at the
point shown in fig. 22 to allow the elbow itself to be inserted more easily
into the flue gas discharge on the boiler.
Concentric pipes (ø 80-125)
For this configuration, the special adaptor kit must be fitted. The concen-
tric pipes can face in the direction most suitable for installation require-
ments. For installation, follow the instructions supplied with the specific
condensing boilers kits.
straight length
concentric pipe ø 80-125 mm
15.3 m
*"Straight length" means without bends, drainage terminals or joints.
ENGLISH
pressure drop
45° bend
90° bend
0.8m
0.5m
pressure drop
45° bend
90° bend
0.5 m
0.85 m
pressure drop
45° bend
90° bend
0.5 m
0.85 m
pressure drop
45° bend
90° bend
1.0 m
1.5 m
7
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