Wiring Diagram - Immergas Maior Eolo 24 4E Installation Manual

3.2 WIRING DIAGRAM.

4
Key:
A9 - P.C.B. to a relay
B1 - Flow probe
B2 - Domestic hot water probe
B4 - External probe (optional)
B9 - DHW inlet probe (optional)
CAR - Comando Amico Remoto remote control Version 2
V2
(optional)
DS1 - Display
E3 - Ignition and detection electrodes
E4 - Safety thermostat
E11 - Aqua Celeris Resistance
Remote control: the boiler is set-up for the appli-
cation of the Comando Amico Remoto remote
control (CAR ) which must be connected
V2 V2
to clamps 41 and 44 of the X15 connector on
the P.C.B. respecting polarity and eliminating
jumper X40.
Room thermostat: the boiler is designed to use
the Room Thermostat (S20). Connect it to clamps
40 – 41 eliminating jumper X40.
The X5 connector is also used for the connection
with three relay board (optional) by removing the
connection to the relay board.
The connector X6 is for connection to a personal
computer.
The connector X8 is used for software updating
operations.
3.3 TROUBLESHOOTING.
N.B.: Maintenance must be carried out by a
qualified technician (e.g. Immergas Technical
After-Sales Assistance Service).
- Smell of gas. Caused by leakage from gas circuit
pipelines. Check sealing efficiency of gas intake
circuit.
2
1
3
F1 - Phase fuse
M1 - Boiler pump
M20 - Fan
M30 - Three-way valve
R5 - Domestic hot water temperature
trimmer
R6 - Central heating temperature
trimmer
S2 - Selector switch functioning
S3 - Reset block keys
S4 - Domestic hot water flow switch
S5 - System pressure switch
- The fan works but ignition discharge does not
occur on the burner ramp. The fan may start
but the safety air pressure switch does not
switch the contact over. Make sure:
1) the intake/exhaust duct is not too long (over
allowed length).
2) the intake/exhaust duct is not partially blo-
cked (on the exhaust or intake side).
3) the diaphragm of the flue exhaust is adequate
for the length of the intake-exhaust duct.
4) that the sealed chamber is kept in good con-
ditions.
5) the fan power supply voltage is not less than
196 V.
- Irregular combustion (red or yellow flame).
This may be caused by: dirty burner, incorrect
combustion parameters, intake - exhaust ter-
minal not correctly installed. Clean the above
components and ensure correct installation of
the terminal.
- Frequent interventions of the over heating
safety thermostat. It can depend on reduced
water pressure in the boiler, little circulation
in the heating system, the blocked pump or
an anomaly of the boiler P.C.B. Check on the
11
7
6
S6 - Flue gas pressure switch
S20 - Room thermostat (optional)
S32 - Boost Button (Aqua Celeris activation)
S31 - On/Stand-by/Off Button
T1 - Switch-on transformer
T2 - Boiler board transformer
X40 - Room thermostat jumper
Y1 - Gas valve
Y2 - Gas valve modulator
U1 - Rectifier inside the gas valve
connector (Only available on Ho-
neywell gas valves)
1 - Anti-freeze kit (optional)
2 - 230 Vac 50 Hz power supply
3 - N.B.: The user interface is on the
welding side of the boiler board
4 - Zones control unit (optional)
5 - Yellow/Green
6 - Brown
7 - Blue
8 - Black
9 - Domestic hot water
10 - Central heating
11 - Red
12 - Orange
13 - White
14 - Grey
15 - Green
manometer that the system pressure is within
established limits. Check that radiator valves
are not all closed.
- Presence of air in the system. Check ope-
ning of the hood of the special air vent valve
(Fig. 1-34). Make sure the system pressure and
expansion vessel pre-charge values are within
the set limits; the factory-set pressure value
for the expansion vessel must be 1.0 bar, and
system pressure between 1 and 1.2 bar.
- Ignition block see par. 2.5 and 1.4 (electric
connection).
ES
PT
GR
CZ
HU
IE
Fig. 3-2
161