6
“Anti-frost” position
Boiler is in stand-by mode. All boiler functions are inactive besides
“Anti-frost”. “Anti-frost” function protecting CH flow: when the flow
probe detects a temperature below 5°C, the boiler turns ON until
the flow temperature reaches 50°C or 15 mins.
“Anti-frost” function protecting DHW: when the water tank probe de-
tects a temperature below 5°C, the boiler turns ON until the water
in the tank reaches 10°C or 15 mins.
“Summer” position
Boiler operates in DHW supply mode only.
DHW
DHW supply supersedes any other boiler function.
The user might set DHW parameters through knob 12, programmer
15 and the mixing valve (pic. 2).
- knob 12 allows for selection of DHW production mode (with AQUA
PREMIUM SYSTEM or “instantaneous production”) and to set
DHW temperature in the water tank (50°C to 65°C); it is recom-
mended to set storage tank water temperature around 60°C (turn
knob clockwise almost fully);
- programmer 15 allows for selection of automatic water tank
switching on and off;
- mixing valve (pic. 2) allows to set DHW temperature to the tap.
In detail the user might choose to have DHW supplied in “instanta-
neous“ or “AQUA PREMIUM” system mode.
By turning knob 12 fully counter-clockwise, after a couple of secon-
ds LED
will switch on or off.
led ON indicates “enabled water tank” mode (AQUA PREMIUM
system).
led OFF indicates disabled water tank (“instantaneous mode
boiler”).
In AQUA PREMIUM mode, setting channel 2 through the program-
mer, it is possible to select automatic switching on/off programs for
the water tank (see sect. 1.2.3 “Electronic programmer setup”).
NOTE
When the boiler is set to AQUA PREMIUM system mode, channel
2 settings of programmer 15 manages DHW also.
When the programmer is ON, the boiler is in “enabled water tank”
mode (AQUA PREMIUM system), when the programmer is OFF,
the boiler operates as a standard “Instantaneous” boiler (
led
is always ON).
DHW flow temperature is to be adjusted through the thermostatic
valve located in the rear area of the boiler (pic. 2).
Turn valve knob counter-clockwise (+ position) to increase DHW
temperature, turn valve knob clockwise (- position) to decrease
DHW temperature.
In order to adjust DHW flow temperature to approximately 50°C,
shut the valve off by turning its knob fully clockwise, then turn it
three and a half rotations counter-clockwise.
CH
Boiler electronics manage temperature and operation of the radia-
tors through adjusting knob 13 and mode selecting knob 11. Knob
13
sets CH flow temperature and “warm boiler ON” – “warm boiler
OFF” functions.
In addition to that, when the boiler is equipped with an external
temperature probe, the user sets a fictitious room temperature va
-
lue via knob 13 (please, see “SLIDING” TEMPERATURE OPERA-
TION section).
Knob 13 is used to adjust two settings:
1. CH flow temperature (50°C to 90°C range).
2. Set boiler to “warm boiler ON” – “warm boiler OFF” mode.
When the boiler is in “warm boiler ON” mode (
led ON), the
primary heat exchanger, when CH or DHW are not required, is kept
to a constant 50°C temperature.
When the boiler is in “warm boiler OFF” mode (
led OFF), the
primary heat exchanger, when CH or DHW are not required, is not
heated and the boiler stays OFF.
In order to select “warm boiler ON” – “warm boiler OFF” mode,
proceed as follows.
- Turn CH temperature adjusting knob fully counter-clockwise.
- Wait for two seconds until the led which indicates the boiler ope-
ration mode changes its status (from ON to OFF or vice-versa)
(please, see above instructions).
- Now CH temperature can be set through the adjusting knob.
NOTE
It is convenient to set the boiler to “warm boiler ON” mode, particu-
larly during summer and when the boiler is set to “instantaneous”
mode, because, being the boiler heat exchanger already warm, it
supports the plate heat exchanger in providing DHW more promp-
tly.
1.2.2.4 Thermal unit managing one mixed water CH area, one
high temperature CH area and DHW supply (V version)
Boiler operation indications, malfunction diagnosis, and DHW
supply mode are identical to the thermal unit managing one high
temperature CH area and DHW supply; CH operation mode is dif-
ferent.
The following instructions refer to what changes in boiler without
mixed water CH area management.
Position no. 17 switch to I: power is connected to the boiler and the
switch lights up.
Boiler operation mode is selected through knob 11. In detail:
“Programmer” position
The boiler electronics manage the program set via the two-channel
programmer 15. The user manages CH boiler operation through
channel 1 (please, see CH section). The user manages DHW boiler
operation through channel 2 (please, see DHW section).
- CHANNEL 1 with external temperature probe.
Channel 1 ON
: CH flow temperature (high and low temperature
areas) is managed in order to maintain the COMFORT room tem-
perature set through knob 13.
Channel 1 OFF
: CH flow temperature (high and low temperature
areas) is managed in order to maintain the REDUCED room tem-
perature.
REDUCED room temperature = COMFORT room temperature mi-
nus 4°C; when CM4 jumper is positioned to 0 – please, see wiring
diagram section;
REDUCED room temperature = COMFORT room temperature mi-
nus 2°C; when CM4 jumper is positioned to 1).
Room thermostats turn ON or OFF the relevant zone pumps, and
when all room thermostats are set to OFF, CH demands termina-
te.
pic. 2
