COSMOGAS NOVADENS 24, User Manual

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9
3 - USE
3.15 - Shutdown
procedure
If the boiler is to be shutdown for a
relatively short time and there is no risk
of freezing, simply disconnect from the
mains the switch “12” of figure 1.
If there is a risk of freezing during your
absence, leave the boiler connected to
the mains and the gas open and carry
out the procedure for the shutdown of the
services, turning both knobs “7” and “11”
of figure 1 to OFF.
Now the two services of the boiler are
switched off. On reaching a boiler
temperature of 7°C, the heating pump
automatically switches on. If the
temperature falls further to under 2°C, the
burner will also switch on, so as to protect
the system and the boiler itself from the
effects of freezing weather conditions.
If the boiler is not used for a long period of
time, we suggest emptying it. Contact a
professionally qualified technician.
3.16 - Precautions
against freezing
If you leave the dwelling, disconnect the
gas and electricity supply, since the
appliance is not protected against
freezing. If it is switched off and runs the
risk of being exposed to temperatures
below zero, it is necessary to empty the
appliance. Contact a professionally
qualified technician.
CAUTION!!! It is absolutely
forbidden to introduce chemical
additives, such as anti-freeze or
others, into the domestic water
circuit.
3.17 - Flue gas
discharge
Due to its high efficiency and low pollution
levels, this boiler is considered to be
ecological. Therefore, white smoke may
be discharged from the discharge pipe,
under specific atmospheric and operating
conditions. There is no cause for alarm
as it is only steam which condenses on
contact with the outside cold air.
3.18 - Operating
anomalies
If the boiler fails to start, check that:
F
The gas supply is open;
F
the boiler power supply switch is on;
F
the heating temperature control knob
“7” is in the position suggested by the
symbols;
F
the boiler is not in lock-out mode.
Press the button to re-start it;
F
the room thermostat is set to a higher
temperature than that of the room where
it is installed and that it is programmed
to call for heating at that time;
If during winter operations, there is
hot water but no heating, check that:
F
The room thermostat is set to a higher
temperature than that of the room where
it is installed and that it is programmed
to call for heating at that time;
F
any valves installed on the supply and
return connections are open;
F
open the radiator cocks to purge air;
CAUTION!!!
If after these checks, the system is
still cold, do not attempt any repairs
yourself but contact a qualified
technician.
Figure 5 - Filling cock
OPEN CLOSE