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A
H
s u m -
winter
A
A
CD021C
A
C
CD021C
C
A
B
CD021C
J
K
5
Start-up Procedure
Before starting the boiler, check the following:
- The water pressure on the pressure gauge "E";
- That the gas cock and the inlet for domestic water are open.
These models are equipped with electronic ignition which utilises contact ionisation.
To make switch the boiler on, turn the knob "A" in summer "
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"position a centralised electronic control unit will automatically light the main burner
when needed without any intervention from the outside. If the burner does not light
within the pre-set safety time limit, the display will show an error code.
To reset the ignition system, the reset button "H" must be pressed. Should the sys-
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tem fail to light a second time, check to make sure that the gas cock is open. If the
problem persists, contact one of our Authorised Service Centres.
Winter and Summer Operating Modes
The boiler is fitted with a selector knob "A" which allows you to switch between
winter "
When the knob is set to "
viding heat or hot water for domestic use. The supply of domestic hot water
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always takes precedence over central heating.
When the knob is set to "
provides domestic hot water (when needed).
Turning on the Heating
Turn the "A" selector knob to "
Regulate the temperature of the heating system water in the boiler by turning the
"C" knob. The temperature can vary between 42°C
and about 82°C; The temperature of the heating
system water in the boiler can be regulated on the
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alpha-numerical display. With this type of installa-
tion, the heating thermostat acts on ambient tem-
perature directly.
Installation with an external thermostat:
Turn the "A" selector knob to "
Turn the thermostat knob "C" to the highest temperature setting.
In this instant the boiler is controlled by a time clock and outdoor sensor; COMO
(programmable thermostat) with or without an outdoor sensor; CCM with or with-
out outdoor sensor i.e depending on internal or external temperature. At that
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point, the main burner will turn off and the circulation pump will stop (if a pump
overrun period has not been set, see section 3.6.6. of the "I
I
NSTRUCTIONS
Production of Domestic Hot Water
Turn on the power to the boiler turning the knob "A" to the summer
"
" position
Turn the "B" knob to select the temperature for the hot water (between 44°C and
about 56°C depending on the flow rate of the water).
It is recommended that the temperature knob for the domestic hot water is not
set to a high temperature and then mixed with cold water. Setting the thermo-
stat to medium temperature is preferable
Comfort Function (27 MFFI)
he supply of water for domestic use can become more convenient by means of
the "COMFORT" function, which maintains the secondary exchanger at a pre-
set temperature when the boiler is not running; thereby allowing a quicker deliv-
ery of domestic water when required. This function is activated by pressing the
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"K" button on the control panel. When the function is on, a green L.E.D. "J" on
the control panel will illuminate.
Note: If the "COMFORT" function is on during the pump overrun period, it will be
temporarily deactivated. The green L.E.D. "J" will remain on to indicate that the
boiler will resume the "COMFORT" mode once the pump overrun period is com-
plete.
" and summer "
" operating modes and vice versa
", the boiler can serve the dual purpose of pro-
", the boiler cuts out the heating system and only
";
";
").
" or winter "
NSTALLATION
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