4
5
1. Signal light (red):
when the light is ON the burner was shutdown
due to lack of flame.
Resume heating unit operation by pressing the burner reset button
(pic.4).
2. Signal light (red):
the red led shows activation of the safety thermo-
stat. The burner is turned OFF. The heating unit will resume operation
once the safety thermostat reset button 17 is pressed (remove the
protective cap to access the button).
3. Signal light (green):
the green led is ON and fixed when power is
supplied to the burner (regardless of flame presence).
4. Signal light (red):
the led is ON and fixed when the temperature of
the heating water is between 25° and 35°C. When the led is flashing
the pressure switch has detected low water pressure in the system.
The heating unit and the pumps are turned OFF. As soon as correct
water pressure is restored, the pressure switch will give the ok for ope-
ration, the led will turn OFF and the heating unit will switch ON again.
5. Signal light (red):
the led is ON and fixed when the temperature of
the heating water is between 36° and 45°C. When the led is flashing
the temperature probe 1 (flow) is faulty (interrupted or out of range).
The burner is turned OFF while the pumps keep running. As soon as
the faulty probe is replaced, the led will turn OFF and the heating unit
will resume normal operation. When signal lights 4 and 5 flash simul-
taneously, the external probe (standard in BV and RV models) is faulty
or disconnected. As soon as the probe malfunction is solved the lights
will turn OFF.
6. Signal light (red):
the led is ON and fixed when the temperature of
the heating water is between 46° and 55°C. When the led is flashing it
indicates the connection between the “OPEN THERM” remote control
(option) and heating unit is interrupted or malfunctioning.
As soon as correct connection is restored, the led will turn OFF and the
heating unit will resume normal operation.
7. Signal light (red):
the led is ON and fixed when the temperature of
the heating water is between 56° and 65°C. When the led is flashing (B
and BV models only) the temperature probe 2 (cylinder) is faulty (inter-
rupted or out of range).The heating unit keeps operating in CH mode
(DHW supply is halted).
As soon as the faulty probe is replaced the heating unit will resume
normal operation.
8. Signal light (red):
the led is ON and fixed when the temperature of
the heating water is between 66° and 75°C.
9. Signal light (red):
the led is ON and fixed when the temperature of
the heating water is between 76° and 85°C. When the led is flashing
the temperature has exceeded 85°C.
10. Signal light (green):
the green led is ON and fixed when the hea-
ting unit is operating in central heating mode.
11. Heating unit mode knob:
the knob allows for choosing the
desired heating unit operating mode (refer to paragraphs from 1.2.2
to 1.2.2.3).
12a. Cylinder operation light:
when the led is ON the cylinder is
operating, vice-versa when the led is OFF.
12b. DHW supply adjusting knob:
The knob manages DHW mode of
the heating unit (R and RV models, only when connected to an optional
external cylinder). Refer to paragraphs from 1.2.2 to 1.2.2.3.
13a. EXCHANGER TEMPERATURE HOLDING light:
the led is ON
when the function is activated and vice-versa.
13b. CH temperature adjusting knob:
the knob allows for mana-
gement of CH water temperature (refer to paragraphs from 1.2.2 to
1.2.2.3).
14. Water pressure gauge:
the gauge shows water pressure in the
CH system.
15. Digital programmable timer (standard on BV and RV models,
optional for R and B models ):
the timer allows for management of
operation periods of the heating unit in CH and DHW modes (refer to
paragraphs from 1.2.2 to 1.2.4).
16. ON/OFF button:
when the button is positioned to I, power is sup-
plied to the heating unit and the button light is ON; when the button
is positioned to O, power is not supplied to the heating unit and the
button light is OFF.
17. Reset button:
press the button to resume heating unit operation
when the safety thermostat has shut it down (remove the plastic cap
to access the button). Prior to resume operation, allow the heating unit
to cool down below 70°C.
1. INSTRUCTIONS FOR THE USER
1.1. Control panel
0 0 : 0 0
pic. 1
1 2 3
4 5 6 7 8 9 10
11
12b
14
15 OPTIONAL
16
17
12a
13a
13b
