Beretta Mynute Green E 25 C.S.I. Installer And User Manual page 8

ENGLISH
WARNINGS
The manufacturer will not be liable in the event of failure to
apply the check valve and the related label prior to placing the
boiler in service.
The appliances connected to a collected flue must all be of the
same type and have equivalent combustion characteristics.
The number of appliances that can be connected to a collective
flue in positive pressure is defined by the smoke pipe designer.
MAINTENANCE FOR APPLICATION IN A COLLECTIVE FLUE
UNDER PRESSURE
During scheduled maintenance on the appliance you must also
check the condition of the check valve in order to guarantee correct
operation and safety of the system.
Before proceeding with maintenance you must conduct an analysis
of the combustion product and check the boiler operating status.
In the event of maintenance on the boiler's combustion circuit
(gas discharge pipes, condensate syphon, burner, electrode
conveyors) you must close the gas discharge pipe that comes
from the smoke pipe under pressure and check the seal.
Subsequently:
- Remove electrical power by setting the system's main switch to
"off"
- Close the gas interception taps
- Remove the shell
- Unhook the instrument panel and rotate it downward
- Unhook and remove the air box cover
- After undoing the related fixing screws, remove the right side of
the air box
- Undo the nut that secures the gas train valve to the air box
- Undo and remove the mixer connection gas train (A, fig. 20)
- Remove the ignition electrode and flame detection electrical con-
nections and the fan electrical connections
- Undo the 4 screws that secure the air gas conveyor to the main
heat exchanger (B, fig. 20)
- Remove the conveyor-fan assembly from the heat exchanger (C,
fig. 20), taking great care not to damage the burner insulating panel
- To access the check valve remove the fan by undoing the 4 screws
(D, fig. 21) that secure it to the conveyor
- Ensure that there is no material deposited on the check valve
membrane and remove any you may find, ensuring there is no
damage.
- Check the correct opening and closing operation of the valve
- Reassemble the components working in reverse order, ensuring
that the check valve is reassembled in the correct direction (see
fig. 21)
Failure to observe the above may lead to abnormal operation
of the check valve and consequent differences in the boiler's
performance, up to failure to operate.
Failure to observe what is described here may compromise the
safety of people and animals due to possible carbon monoxide
leaks from the smoke pipe.
Once the operations have been completed, carefully check
all the combustion product exhaust and air suction pipe seals,
conducting a combustion analysis.
NOTE
If the fan is removed ensure that the check valve is reassembled in
the correct direction (see fig. 21).
3.12 Filling the heating system
Once the hydraulic connections have been carried out, fill the heating
system.
This operation must be carried out with a cold system, following
these instructions (fig. 22):
- open the lower automatic relief valve cap (A) by two or three turns
to allow continuous air venting and leave it open
- ensure that the cold water inlet tap is open
- open the filling tap (C) until the pressure indicated on the water
gauge is between 1 bar and 1.5 bar (fig. 23)
- re-close the filling tap.
8
NOTE
deareation of the boiler takes place automatically by means of the
two automatic A and E bleed valves (fig. 24), the former positioned
on the circulator whereas the latter is positioned inside the air box. If
the deareation phase is difficult, operate as described in section 5.3.
3.13 Emptying the heating system
Before starting emptying, switch off the electricity supply by turning
off the main switch of the system.
- Close the heating system shut-off devices
- Slacken the discharge system valve by hand (D)
- The system's water is discharged through the discharge manifold
(F).
The discharge manifold must be connected via a rubber pipe
to an appropriate collection and evacuation system in the white
water discharge drain in compliance with current regulations.
The outer diameter of the manifold is 20 mm: it is therefore ad-
visable to use a rubber pipe Ø18-19 mm closed with a suitable
clamp (not provided).
3.14 Emptying the domestic hot water circuit
When there is risk of frost, the domestic hot water system must be
emptied in the following way:
- close the water mains tap
- open all the hot and cold water taps
- empty the lowest points.
4 - IGNITION AND OPERATION
4.1 Preliminary checks
First ignition is carried out by competent personnel from an author-
ised Technical Assistance Service Centre.
Before starting up the boiler, check:
a) that the supply networks data (electric, water, gas) corresponds
to the label data
b) that piping leaving the boiler is covered by thermal insulation
sheath
c) that flue gas extraction and air suction pipes work correctly
d) that conditions for regular maintenance are guaranteed if the
boiler is placed inside or between furniture
e) the seal of the fuel adduction system
f) that fuel capacity corresponds to values requested by the boiler
g) the correct calibration of the gas valve and, if necessary, adjust
as indicated in paragraph 4.8 "Adjustments"
h) that the fuel supply system is sized to provide the correct deliv-
ery to the boiler, and that it has all the safety and control devices
prescribed by national and local regulations.
4.2 Appliance ignition
Each time the boiler is electrically powered the display shows a se-
ries of information including the gas probe counter value (-C- XX)
(see section 4.4 - fault A09) and then the boiler begins an automatic
venting cycle that lasts about 2 minutes. During this phase the sym-
bol will appear on the display (fig. 25).
To interrupt the automatic venting cycle: access the electronic card
by removing the shell, turning the instrument panel upside down and
opening the electrical parts inspection cover. Subsequently:
- press the CO button (fig. 26).
Live electrical parts (230 Vac).
To start-up the boiler it is necessary to carry out the following oper-
ations:
- electrically power the boiler
- unhook the connections cover as indicated in section 3.13 "Con-
nections cover"
- open the gas tap to allow fuel flow
- set the ambient thermostat at the required temperature (~20°C)
- turn the mode selector to the desired position:
Winter
Turning the mode selector (fig. 27) within the area marked with + and
- the boiler provides domestic hot water and heating.
The boiler lights automatically in response to a heat request.