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4 HOW TO...
4.1
HOW TO INCREASE THE SYSTEM
PRESSURE
The system pressure must be checked periodically to ensure the
correct operation of the boiler. The system pressure is shown
in parameter "h" of the info menu. When the boiler is at room
temperature, the system pressure should be approximately 14.5 psi.
If the pressure needs to be increased use the following instructions
as a guide.
- Open the fill tap (external for heating only boiler model) slowly
until you hear water entering the system.
- Close the fill tap (external for heating only boiler model) when the
pressure reads between 14.5 and 21.7 psi.
- Pressure can be read from INFO menu. Refer to section "3.13
ACCESS TO THE INFO MENU".
filling tap
4.2
HOW TO SHUT DOWN THE SYSTEM FOR
SHORT PERIODS
In the event of temporary absences (weekends, short breaks, etc.)
set the status of the boiler to OFF by pressing the "MODE/OK"
button until the display shows "-OFF-".
While the electrical supply and the fuel supply remain active, the
boiler is protected by the following:
- heating anti-freeze: this function is activated if the temperature
measured by the flow sensor drops below 41°F (5°C). A heat
request is generated in this phase with the ignition of the burner
at minimum output, which is maintained until the outlet water
temperature reaches 95°F (35°C);
- domestic hot water anti-freeze: the function starts if the
temperature measured by the DHW NTC probe falls below 41°F
(5°C). A heat request is generated in this phase with the ignition
of the burner at minimum output, which is maintained until the
outlet water temperature reaches 131°F (55°C);
- domestic hot water anti-freeze (only an indirect water tank is
connected - heating only boiler model): the function starts if
the temperature measured by the indirect tank sensor falls
below 41°F (5°C). A heat request is generated in this phase
with the ignition of the burner at minimum output, which is
maintained until the outlet water temperature reaches 131°F
(55°C.)
NOTICE: The activation of the ANTI-FREEZE function is indicated
by the
icon displayed on the front control.
- circulator anti-seize: the circulator activates every 24 hours for
30 seconds if there is no heating or domestic requests.
-OFF-
4.3
HOW TO SHUT DOWN THE SYSTEM FOR
LONG PERIODS
If the boiler is not used for a long time, the following operations
must be carried out:
- set the status of the boiler to OFF by pressing the "MODE/OK"
button till the display shows "-OFF-"
- set the system's main switch to "OFF"
- close the fuel and water taps of the heating and domestic hot
water system.
9
WARNING: In this case, the anti-freeze and anti-seize systems
are deactivated. Drain the heating and domestic water system
if there is any risk of freezing.
4.4
DRAINING THE HEATING CIRCUIT OF THE
BOILER
Before draining the system, switch off the electrical supply by
turning off the main switch of the system.
− Close the heating system's valves.
− Manually loosen the system drain valve (C).
− Secularly attached the rubber drain tube supplied with the boiler
to (C)
NOTICE: It is recommended to have a qualified person refill and
commission the boiler after an extended shutdown period.
9
DANGER: The system water temperature could be very hot,
be sure when opening the drain valve that the rubber pipe is
well attached. Water could spray from the front of the unit and
cause instant severe burns or death from scalds.
C
4.5
EMPTYING THE DOMESTIC HOT WATER
SYSTEM
Whenever there is risk of freezing, 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 water taps
− drain from the lowest points.
13
-OFF-
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