7
4.10 ELECTRICAL CONNECTIONS
Connection to Mains Supply
The CMX15i and CMX18i boilers must be installed in premises having a system impedance of not more than 0.25
+ j0.25
Ω
.
The CMX15i and CMX18i boilers comply with the technical requirements of EN 61000-3-3.
The CMX15i and CMX18i boilers must be installed in premises having a service capacity
≥
100 A per phase.
Complete all the pipe-work before connecting the boiler to the electricity supply.
Any re-installation must be performed by qualified electricians.
Ensure that the mains voltage available coincides with that shown on the rating label.
WARNING:
THE SUPPLY CABLE TO THE BOILER SHOULD BE OF SUFFICIENT SIZE TO CARRY
THE LOAD CAPACITY REQUIRED. IT SHOULD BE WIRED THROUGH A LINKED ISOLATOR SWITCH
WITH MINIMUM CONTACT GAPS OF 3mm IN EVERY POLE AND PROTECTED BY A SUITABLY RATED
CIRCUIT BREAKER MCB/RCD
Install the necessary electrical protections as indicated in the current regulations. In the event of these regulations
not being complied with, the manufacturer will not be liable for any bodily injury or material damage that may
occur.
WARNING:
IT IS ESSENTIAL THAT THE BOILER IS PROPERLY EARTHED and the wiring tested to
current IEE regulations.
Electrical Supply Sizing
The following table shows the specification for a boiler installed on three phase single phase N~.
The following table shows the specification for a boiler installed on single phase 230V~ supply.
*
The standard configuration of the boiler only allows a maximum of 12kW when connected SINGLE-PHASE
230V~.
Connection to Boiler
WARNING:
Touching live connections can cause serious personal injury.
Before establishing a mains connection switch off the power supply. Secure the power supply against being
switched on again. Mains connection terminals remain live even if the on/off switch is turned off.
Rated output of boiler
4kW 5kW 6kW 7kW 8kW 9kW 10kW 11kW 12kW 13kW 15kW 18kW
Supply current
13.0A 13.0A 13.0A 13.0A 13.0A 13.0A 21.7A 21.7A 21.7A 21.7 21.7A 26.0A
RCD rating
16A 16A 16A 16A 16A 16A 25A 25A 25A 25A 25A 32A
Minimum cable size
4mm 4mm 4mm 4mm 4mm 4mm 6mm 6mm 6mm 6mm 6mm
10mm
Rated output of boiler
4kW 5kW 6kW 7kW 8kW 9kW 10kW 11kW 12kW 13kW 15kW 18kW
Supply current
17.4A 21.7A 26.1A 30.4A 34.8A 39.1A 43.5A 47.8A 52.2A 56.5A* 65.2A* 78.3A*
RCD rating
20A 25A 32A 32A 40A 50A 50A 50A 63A 63A* 80A* 80A*
Minimum cable size
4mm 6mm 10mm 10mm 10mm 16mm 16mm 16mm 16mm 25mm 25mm
35mm
