Flue Gas Discharge And Air Suction; Possible Outlet Configurations; "Forced Open" Installation; "Sealed" Installation - Riello Caldariello Condens 25 KIS E Installer And User Manual

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.
heating 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 com-
bustion chamber and the control board constantly checks that this is
working 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
essential to only use certified piping. Connection must be carried out cor-
rectly as indicated 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
areas 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.
"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 3° 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
25 KIS
29 KIS
*"Straight length" means without bends, drainage terminals or joints.
pressure drop
45° bend
70 m
1,0m
65 m
"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 indi-
cated in the table.
Arrange the flue gas discharge pipe so it slopes by 3° 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
concentric pipe ø 60-100 mm
25 KIS
29 KIS
Vertical
concentric pipe ø 60-100 mm
25 KIS
29 KIS
*"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 concentric
pipes can face in the direction most suitable for installation requirements.
For installation, follow the instructions supplied with the specific condens-
ing boilers kits.
concentric pipe ø 80-125 mm
25 KIS
29 KIS
*"Straight length" means without bends, drainage terminals or joints.
Twin pipes (ø 80 mm) (fig. 23)
Twin outlets can be placed in the most suitable direction according to the
room requirements.
To use the combustion air suction pipe, one of the two inlets (E-F fig. 23)
must be selected. Remove the closure plug which is fixed using screws,
and use the specific adaptor relating to the inlet selected.
Arrange the flue gas discharge pipe so it slopes by 3° towards the
boiler.
The boiler automatically adapts the purging to the type of installation
and the length of the pipes. Do not obstruct or choke the pipes in
any way.
Refer to the graphs to find the maximum lengths of the single pipe.
The use of longer pipes reduces the boiler output.
maximum straight length
90° bend
twin pipes ø 80 mm
25 KIS
1,5m
29 KIS
*"Straight length" means without bends, drainage terminals or joints.
straight length *
5,85 m
4,85 m
straight length *
6,85 m
5,85 m
straight length
15,3 m
12,8 m
45 + 45 m
40 + 40 m
ENGLISH
pressure drop
45° bend 90° bend
1,3m 1,6m
pressure drop
45° bend 90° bend
1,3m 1,6m
pressure drop
45° bend 90° bend
1,0m 1,5m
pressure drop
45° bend 90° bend
1,0m 1,5m
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