26
b
The minimum permissible pressure difference between the flue
gas outlet and the combustion air inlet is -200 Pa (including - 100
Pa of wind pressure
).
For both types of exhaust, further accessories are available (curves,
extensions, terminals, etc.) which make possible the flue gas exhaust
configurations foreseen in the section
“3.8 Flue gas exhaust and com-
b
The pipes must be installed in such a way as to avoid conden-
sation sticking which would prevent the correct evacuation of the
combustion products.
b
A data plate must be present at the connection point with the col-
lective flue pipe. The plate must include at least the following in
-
formation:
-
the collective flue is sized for boilers C(10) type
-
the maximum permissible mass flow of the combustion pro
-
ducts in kg/h
- the dimensions of the connection to the common pipes
- a warning concerning the openings for the air outlet and the en-
try of the combustion products of the collective pressure pipe;
these openings must be closed and their tightness must be
checked when the boiler is disconnected
- the name of the manufacturer of the collective smoke pipe or
its identification symbol
b
See applicable legislation for the discharge of the combustion
products as well as local regulations.
b
The flue gas pipe must be suitably selected based on the param
-
eters shown below.
maximum length
minimum length
UM
ø 80-80
4,5+4,5
0,5
m
ø 80/125
4,5
0,5
m
b
Before attempting any operation, disconnect the appliance from
the electrical supply.
b
Before assembling, lubricate the gaskets with a non-corrosive
glide lubricant.
b
The flue gases discharge pipe should be inclined, if the pipe is
horizontal, by 3° towards the boiler.
b
The number and characteristics of the exhaust ventilation devices
which are the real characteristics of the flue itself
.
b
The terminal of the collective pipe must generate an upward air
current.
b
The condensation can flow inside the boiler.
.
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 de
-
vice.
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 “3.8 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.
3.10
Filling the heating system and eliminating air
A
C
NOTE:
fill the system via the filling tap (
A
) making sure the boiler is
electrically powered.
NOTE:
each time the boiler is powered up, the automatic venting cycle
is carried out.
NOTE:
the presence of a water alarm (A40, A41 or A42) does not allow
the venting cycle to be carried out.
Fill the heating system as follows:
-
open
the filling tap (
A
) turning it counterclockwise
-
access the INFO menu (“5.3 INFO menu
”, item I018), to check
that the pressure value reaches 1-1.5 bar
-
close the filling tap (
A
).
.
1
5
bar
.
NOTE:
if the mains pressure is less than 1 bar, keep the filling tap (
A
)
open during the venting cycle. Close it when the cycle has ended.
To
start
the venting cycle:
-
switch off the electrical supply 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 (
A
) again to bring the pressure back up to the recommended
value (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.
3.11 Draining the boiler heating circuit
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 tap (
C
), then manually turn it
counterclockwise
to let the water flow out
.
NOTE: adjust the system discharge tap (
C
) using a no.13 spanner
-
Once the operations have been completed, remove the pipe from the
system discharge tap (
C
) and close it again.
3.12 Draining the boiler DHW circuit
Whenever there is risk of frost, the domestic hot water system must be
emptied in the following way:
-
turn off
the main water supply tap
- turn on all the hot and cold
-
drain the lowest points.
4 COMMISSIONING
4.1
Preliminary checks
First ignition is carried out by competent personnel from an authorised
Technical Assistance Centre. Before starting up the boiler, check:
that the data of the supply networks (electricity, water, gas) corre-
spond to the label data
that the extraction pipes of the flue gases and the air suction pipes
are working correctly
that conditions for regular maintenance are guaranteed if the boiler is
placed inside or between items of furniture
the seal of the fuel adduction system
that the fuel flow rate corresponds to values required by the boiler
that the fuel supply system is sized to provide the correct flow rate to
the boiler, and that it has all the safety and control devices required
by current regulations
that the circulator rotates freely because, especially after long periods
of inactivity, deposits and/or debris can prevent free rotation
that the siphon is completely filled with water, otherwise fill it up (see
chapter “4.2 First commissioning”).
4.2 First commissioning
On first ignition after prolonged inactivity and after maintenance, before
putting the appliance into operation it is essential to fill the condensate
collection siphon by pouring about 1 litre of water into the boiler combu-
stion analysis take-off and check
:
-
floating of the safety shutter
-
the correct flow of water from the boiler outlet discharge pipe
- the leaktightness of the condensate drain connection line.
Correct operation of the condensate drain circuit (siphon and pipes) re-
quires that the condensate level does not exceed the maximum level
(max). Prior filling of the siphon and the presence of the safety shutter
inside the siphon is designed to prevent the escape of combustion gases
into the environment.
