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B004
3.9 Draining the System
Draining the heating system.
The heating system must be emptied as follows:
- Turn off the boiler;
-Open the drain valve for the system and place a container below to catch
the water that comes out;
- Empty the system at the lowest points (where present). If you plan on not
using the heating system for an extended period of time, it is recommended
that you add antifreeze with an ethylene glycol base to the water in the
heating lines and radiators if the ambient temperature drops below 0°C during
the winter.
This makes repeated draining of the entire system unnecessary.
Draining the domestic hot water system.
Whenever there is the danger of the temperature dropping below the freezing
point, the domestic hot water system must be drained as follows:
- Turn off the general water valve for the household plumbing system;
- Turn on all the hot and cold water taps;
- Empty the remaining water from the lowest points in the system (where
present).
The boiler is equipped with the following safety systems (see section 3.3 for
references):
1. - Ignition Failure
This control signals an ignition failure on the burner 7 seconds after a lighting
failure.The L.E.D. “B” will turn on to signal the shutdown status.
The system can be reset by pressing and releasing the button “A” after
checking to make sure that the gas valve is open. Repeat this process until the
burner lights.
2. - Circulation Failure
This control signals that the safety pressure switch on the primary circuit has
not sensed a pressure of at least 1 bar within 40 seconds of the activation of
the circulation pump, it shuts off the boiler and lights the L.E.D. “D” The system
can be reset (after the pressure has been brought up to the proper level) by
using the On/Off switch “L”.
3. - Overheating
This control shuts off the boiler in the case where the primary circuit reaches a
temperature in excess of 110°C. The L.E.D. “G” will come on to signal this shut-
off status. After the system has been allowed to cool, the system can be reset
by pressing the button “A”.
4. - Limescale Build-up
This is an indirect control (actuated through the regulation of the temperature in
the primary heat exchanger) on the formation of limescale in the secondary
heat exchanger. Regardless of the flow rate and the temperature in the circuit
for the domestic hot water, the temperature is limited to 62°C.
5. - Anti-frost Device
The boiler is equipped with a device that automatically lights the main burner
when the temperature in the delivery line to the system drops below 5°C. The
boiler will continue to operate until the temperature in question reaches about
58°C.
This device is activated on a properly operating boiler if:
- the system pressure is between the acceptable values;
- the power supply to the unit is on;
- the unit is supplied with gas.
This feature is enabled also when the boiler is in summer operating mode.
6. - Safety Shut-off
At the start of every lighting phase, the P.C.B. performs a series of internal
controls. If a malfunction occurs, the boiler will shutdown until the problem has
been resolved.
3.8 Boiler Safety
Systems