26
Installation and Servicing
Section 2 - Installation
INST
ALLA
TION
Installer Connections (LHS)
Installer Connections (RHS)
Refer to Section
3.4
Refer to Section
3.2
OPEN THERM./
WEATHER COMP.
B
2.18 ELECTRICAL CONNECTIONS
The boiler must be connected to a permanent live power
supply.
Connecting the Switched Live to the Boiler
1. Consult the Y Plan and S Plan diagrams overleaf.
2. Isolate the mains supply to the boiler.
3. Remove the front panel.
4. Swing down the control box into the service position,
unclip and swing back the installer wiring cover and
latch into the retaining clips.
All of the connections can now be readily accessed.
5. Connect the switched live to
the terminal block as shown.
Note.
The cable strain relief system and grommets.
6. Once any wiring is completed, to secure the boiler,
reverse the order above.
Frost Thermostat – Wiring
If parts of the system are vulnerable to freezing or the
programmer is likely to be left off during cold weather, a frost
stat should be fitted in conjunction with a pipe thermostat.
COMBI
HEA
T / SYSTEM
SL1
L
IN
L
IN
SL2
OPTIONAL
FROST STAT
ROOM
STAT/
TIMER L N
MAINS IN
UIN
230010 A01
L N
MAINS IN
COMBI
HEA
T / SYSTEM
SL1
L
IN
L
IN
SL2
OPTIONAL
FROST STAT
ROOM
STAT/
TIMER L N
MAINS IN
UIN
230010 A01
L N
MAINS IN
WARNING:
Ensure the supply cord is not damaged
2.19 INSTALLER WIRING
Wiring should be 3 core PVC insulated cable, not less
than 0.75 mm
2
(24 x 0.2 mm), and to BS EN 50525-1:2011
Table 16.
Connection must be made in a way that allows complete
isolation of the electrical supply. The means of isolation
must be accessible to the user after installation.
A mains supply of 230 V ~ 50 Hz is required.
3 A fuse required. All external controls and wiring must be
suitable for mains voltage.
Wiring external to the boiler must follow current I.E.E
(BS7671) wiring regulations and local regulations.
WARNING:
This appliance must be earthed