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25 INTERNAL WIRING
The Logic System boiler comes pre-fitted with 1.8m of mains cable. This must
be connected to a permanent live supply and NOT switched by thermostats/
programmers. If the supply cord is damaged, it must be replaced by the
manufacturer, service agent or similarly qualified persons in order to avoid hazard.
For installers wishing to change this cable refer to Frame 26.
Connecting the Switched Live to the Boiler
1. Consult the Y Plan and S Plan diagrams below.
2. Isolate the mains supply to the boiler
3. Remove the front panel. Refer to Frame 8.
4. Swing the control box down into the servicing position.
5. Route incoming cable through a grommet in the bottom panel (note that the
grommets are "blind" and will require puncturing) and secure using the clamp.
6. Connect the switched live to the terminal block as shown.
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.
LOGIC SYSTEM BOILER WITH Y PLAN SYSTEM
L
N
FUSED
SPUR
L
N
TIMER
LOGIC SYSTEM BOILER WITH S PLAN SYSTEM
L
N
FUSED
SPUR
L
N
TIMER
Installation and Servicing
INSTALLATION
E
CH
L
N
E
ON
CH ON
HW ON
HW OFF
E
E
L
N
CH ON
HW ON
g/y
R/S
C/S
R/S
HW
HW
C/S
ON
ON
OFF
ON
g/y
g
CH
b
S PLAN
g/y
VALVE
br
o
R/S
C/S
CH
R/S
HW
HW
C/S
ON
ON
ON
OFF
ON
b
Y PLAN
VALVE
w
g
o
BOILER
L
N
E
sL
3G10022
g
HW
b
S PLAN
VALVE
br
o
BOILER
L
N
E
sL
3G10023
29
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