- 19 -
Service Call 0844 736 9138, Technical Help (Chargeable) Call 0906 802 0253
230V permanent 230V system controls
a
All cables connected to the appliance should be
permanently fi xed to the wall.
8
Key
1 230V permanent supply
2 230V room stat
3 Frost stat
4 Main board terminal block
RT = Switch live (230V)
= Mains earth
N = Mains neutral
L = Mains live
5 Junction box
6 Fuse
7 Double pole connector
8 Terminal block
• Connect the mains supply and system heating controls e.g.
room thermostat as described.
When installing 24V or 230V controller, the link fi tted to the 24V
terminals (X17 RT/24 V) shown below, must be removed.
This appliance will not operate without a link or
system controls fi tted. The frost thermostat will only
operate the boiler when in Winter mode. (DHW+CH)
If 230V thermostats are connected into RT then they
must all be fed from the same live source as the
boiler.
If any external 24V or 230V thermostats are connected this link
should be removed.
10.5 External accessories
e
Under no circumstances must any mains voltage
be applied to any of the terminals on the 24v
connection plug.
X17
RT 24V
T° ext
BUS
BUS
24 V
3
2
1
Key
1 24V room thermostat connector
2 24V Ebus room thermostat connector or Ebus radio receiver
3 24V Outdoor sensor connector
• Fit external controls in accordance with the rules in force.
10.6 Testing the electrical connections
Carry out preliminary electrical system checks as below:
• Resistance to earth (<1 Ohm)
• Short circuit test (L-N)
• Resistance to earth (L-E)
• Polarity check
