Immergas NIKE Mini 28 kW Special Manual De Instrucciones página 75

• External temperature probe. This sensor can be connected directly to the
boiler electrical system and allows the max. system delivery temperature
to be automatically decreased when the outside temperature increases, in
order to adjust the heat supplied to the system according to the change in
external temperature. The external probe always operates when connected,
regardless of the presence or type of room chronothermostat used and
can work in combination with the On/Off chronothermostat and the
RFC, ((it cannot be connected to the DRC). The correlation between
system delivery temperature and outside temperature is determined by
the position of the knob on the boiler control panel according to the
curves shown in the diagram.The external probe electrical connection
must be made on clamps 38 and 39 on the boiler circuit board (see wiring
diagram).
Electrical connection of the Remote Friend Control or chronothermostat
On/Off (Optional). The operations described below must be performed after
having removed the voltage from the appliance. The eventual thermostat or
On/Off room chronothermostat must be connected to terminals 40 and
41 eliminating jumper X40 (see wiring diagram). Make sure that the On/
Off thermostat contact is of the "clean" type, i.e. independent of the mains
supply; otherwise the electronic adjustment card would be damaged. L
The eventual Remote Friend Control must be connected by means of
terminals IN+ and IN- to terminals 42 and 43 on the terminal board (in
the boiler) respecting polarity and eliminating jumper X40, (see wiring
diagram). Connection with the wrong polarity prevents functioning, but
without damaging the Remote Friend Control. Control only if the boiler
main selector is turned to Domestic/Remote Friend Control (
boiler can only be connected to one remote control
Important: If the Remote Friend Control, Digital Remote Control or
any other On/Off chronothermostat is used arrange two separate lines in
compliance with current regulations regarding electrical systems. Boiler
pipes must never be used to earth the electric or telephone lines. Ensure
elimination of this risk before making the boiler electrical connections.
Position of the heating temperature
user adjustment
).The
1.4 Room ventilation.
The room where the boiler is installed must have at least as much incoming
air flow as that required for regular combustion and room ventilation. The
natural air flow must occur directly through:
- permanent apertures made in the walls of the room being ventilated, and
opening outwards;
- single or multiple ventilation ducts.
Ventilation air must be drawn directly outside, in a zone away from sources
of pollution. Natural air flow may also be provided indirectly with ventilation
air drawn from adjacent rooms. For further details regarding ventilation of
rooms follow the procedures prescribed by the regulations.
Evacuation of foul air. In the rooms where the gas appliances are installed
it may also be necessary, as well as the intake ofcombustion agent air, to
evacuate foul air, with consequent intake of a further equal amount of
clean air. This must be realised respecting the provisions of the technical
regulations in force.
1.5 Flues.
Gas-fired appliances provided with connection for a flue must have a direct
connection to an efficient chimney or flue.
Only if there is no flue or chimney, may fumes be discharged directly to the
outside, provided this is done in accordance with the applicable standards
Connection to a chimney or flue. The appliance is connected to a chimney
or a flue via a fume duct.
In the case of connection to an existing flue, this must be perfectly clean, because
any eventual deposits detaching from the walls during operation could obstruct
the passage of fumes, thus causing extremely dangerous situations for the user.
The fume ducts must be connected to the chimney or flue in the same room
in which the appliance is installed or, at most, in the adjoining room and
must comply with the requisites of this regulation.
1.6 Chimneys/flues.
Appliances with natural draught can have single flues or multiple flues.
Single flues. The inside dimensions of certain types of single flues are
given in the specifications of the standard. If the actual system data does
not come within the application conditions or the limits prescribed in the
tables, calculate the flue according to standards.
Shared branched flues. In multi-storey buildings, shared branched flue
systems can be used for the removal of combustion products by natural
draught. Newly constructed shared branched flues must be designed us-
ing the following calculation method and meet the requirements of the
standard.
Chimney caps. Terminals are the devices installed on top of single or
shared branched flues. These devices are installed to facilitate dispersion
of combustion products also in adverse weather conditions and to prevent
entry of foreign matter.
This must satisfy the requisites of the regulation.
The outlet height, corresponding to the top of the flue/chimney, regardless
of eventual terminals, must be outside the "downdraught zone", to avoid
the risk of back pressure preventing the free discharge of fumes into the
atmosphere. Therefore always observe the minimum heights indicated in
the figures in the standard, according to the pitch of the roof.
Direct discharge to the outside. Natural draught appliances, required to be
connected to a chimney or flue, can discharge fumes directly to the outside
by means of a duct passing through the external wall of the building. In this
case, the appliance is vented through a flue duct with a external terminal.
Exhaust duct. The exhaust duct must meet the same technical requirements
given for flues, with further provisions as per the current standard.
Positioning the draft terminals. Draft terminals must:
- be installed on external perimeter walls of the building;
- be positioned according to the minimum distances specified in current
technical standards.
Discharge of combustion products of natural draught appliances within
enclosed areas without roofs (ventilation pits, inner courtyards, etc.), direct
discharge of fumes is allowed for natural or forced draught gas appliances
with a heat output from 4 to 35 kW, provided the specifications of current
technical standards are complied with.
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