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6. ELECTRICAL CONNECTION
The boiler must be connected to 230V - 50Hz
single-phase + earth mains power, in com-
pliance with the following requirements
The system must be compliant with the safety
STANDARDS IN FORCE.
- Use a two-pole disconnect switch compliant
with IEC-EN standards (minimum contact ope-
ning 3 mm)
- Ensure correct connection L (Phase) - N (Neutral)
- Use cables with a minimum cross-section of
1.5 mm
2
- Refer to the wiring diagrams in this booklet for
any electrical work
- Connect the appliance to an effective earth
system.
7.2 Single-phase burner and pump wiring diagram (Fig. 17)
Key
IG
Main switch
TS
Safety thermostat 110°C
TM
Minimum thermostat 45°C
TA
Room thermostat
IB
Burner switch
SB
Burner lockout indicator light
7. CONTROL PANEL
7.1 Functional description
The main switch (11) powers the control panel
and connected equipment.
Switches (12) and (13) disconnect power to the
burner and system pump respectively.
The thermostat (21) is used to set the boiler
operating temperature.
The minimum thermostat stops the system
pump until the temperature inside the boiler rea-
ches 50°C.
For three-phase burners and/or of system
pumps or if current draw exceeds 3 A, contac-
tors should be installed between the boiler panel
and the load.
BURNER CONNECTOR
2
nd
flame
Fig. 17
SL
Power indicator light
Ch
Hour counter
PI
System pump
IPi
System pump switch
TR1-TR2 2-stage thermostat 1
st
-2
(30°-90°C Δt 1
st
-2
nd
flame = 7°C)
- 19 -
A switch with protection fuses must be installed
on the boiler control panel power supply line.
T Thermometer
R Manual reset
S Burner lockout indicator light
C Hour counter (optional)
WARNING
For electrical connections to boilers with a rated
output exceeding 300,000 kcal/h, installers must
fit a second safety thermostat.
F4/K4
RVP Temperature controller
connection
L
N
nd
flame
3-20
GB
Connection
terminals
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