Immergas 3.020857, Instruction Booklet And Warning

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INS
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3.2 WIRING DIAGRAM.
Key:
B1 - Flow probe
B2 - Domestic hot water probe (optional)
B4 - External probe
CAR
V2
- Comando Amico Remoto remote control
Version 2 (optional)
DS1 - Display
E3 - Ignition and detection electrodes
E4 - Safety thermostat
F1 - Phase fuse
M1 - Boiler pump
M30 - Three-way valve (optional)
R8 - Storage tank resistance
S2 - Selector switch functioning
S3 - Reset block keys
S4 - Domestic hot water flow switch
S5 - System pressure switch
S20 - Room thermostat (optional)
S21 - Domestic hot water temperature
increase key
S22 - Domestic hot water temperature reduce
key
S23 - Heating temperature increase key
S24 - Heating temperature reduce key
The boiler is designed for application of a room
thermostat (S20), an On/Off room chronother-
mostat, a program timer or a Comando Amico
Remoto remote control
V2
(CAR
V2
). Connect
to clamps 40 - 41 eliminating the jumper X40,
paying attention not to invert the polarity if the
CAR
V2
is installed.
Cylinder unit: the boiler is prepared for the ap-
plication of a storage tank unit, which must be
connected to clamps 36 and 37 of the bipolar
terminal board positioned under the sealed
chamber, eliminating resistance R8.
The connector X3 is present in the boiler but
must be connected only if the storage tank unit
is present.
The connector X8 is used for the connection
of the Virgilio Palmtop in the microprocessor
software updating operation.
3.3 TROUBLESHOOTING.
N.B.:
maintenance operations must be carried
out by an authorised company (e.g. After-Sales
Technical Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing efficiency of gas intake
circuit.
- Irregular combustion (red or yellow flame).
When the burner is dirty or the boiler lamellar
pack is blocked. Clean the burner or the boiler
lamellar pack.
- Frequent interventions of the over heating
safety thermostat. It can depend on the lack
of water in the boiler, little water circulation
in the system or blocked pump. Check on the
manometer that the system pressure is within
established limits. Check that the radiator val-
ves are not closed and also the functionality of
the pump.
- The boiler produces condensate. This can be
caused by obstructions of the chimney or flues
with height or section not proportioned to the
boiler. It can also be determined by functioning
at boiler temperatures that are excessively low.
In this case, make the boiler run at higher
temperatures.
- Frequent interventions of the flue safety ther-
mostat This can be caused by obstructions in
the flue gas circuit. Check the flue. The flue
may be obstructed or by height or section
not suitable for the boiler. Ventilation may be
insufficient (see room ventilation point).
- Presence of air in the system. Check opening of
the hood of the special air vent valve (Fig. 1-7).
Make sure the system pressure and expansion
vessel pre-charge values are within the set
limits; the pre-charge value for the expansion
vessel must be 1.0 bar, and system pressure
between 1 and 1.2 bar.
- Ignition block and Chimney block. (See par.
2.6 and 1.5 (electric connection).
T1 - Low voltage feeder
T2 - Switch-on transformer
U1 - Rectifier inside the gas valve
connector (Only available on
Honeywell gas valves)
X40 - Room thermostat jumper
Y1 - Gas valve
Y2 - Gas valve modulator
1 - User interface
2 - N.B.: The user interface is on
the welding side of the boiler
board
3 - 230 Vac 50Hz power supply
4 - Blue
5 - Brown
6 - Yellow/Green
7 - Black
8 - (DHW)
9 - (central heating)
10 - Grey
11 - White
12 - Red
13 - Green
14 - Storage tank unit (optional)