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2.20 INSTALLER WIRING - CONTINUED
Logic + System
S BOILER WITH S PLAN SYSTEM (without outside sensor)
2
L
FUSED
SPUR
L
N
TIMER
2.21 REPLACING PRE-FITTED MAINS CABLE
If it is necessary to use an alternative mains cable to the one pre-fitted
then use the following guide.
Replacement wiring should comply with notes and be carried out by a
qualified person.
1. Isolate the mains supply to the boiler.
2. Remove the front panel.
3. Swing the control box down into the service position, unclip and
swing back the installer wiring cover to latch into the retaining clips.
4. Unscrew the L N &
connections & remove wires from connector.
5. Remove the mains cable by pulling back through the grommet .
6. Route the replacement through the grommet and re-fit.
7. Close the installer wiring cover ensuring that it is located correctly
and that the cable is retained into the strain relief as shown.
8. Swing the control box back up into the operating position and re-fit the front panel ensuring a good seal is made.
The earth connection should be longer than the current carrying connections. If the cord anchorage slips, the current carrying
wires become taut before the earth.
2.22 ELECTRICAL CONTROLS
Wiring External to the Boiler
The fuse rating should be 3A.
Wiring external to the boiler MUST be in accordance with the current
I.E.E. (BS.7671) Wiring Regulations and any local regulations.
Frost Protection
If parts of the pipework run outside the house or if the boiler will be
left off for more than a day or so then a frost thermostat should be
wired into the system.
The frost thermostat should be sited in a cold place but where it can
sense heat from the system.
If the boiler is installed in a garage it may be necessary to fit a pipe
thermostat, preferably on the return pipework.
Installation and Servicing
Section 2 - Installation
N
E
g
b
g/y
br
R/S
CH
R/S
E
L
N
ON
ON
CH ON
HW ON
HW OFF
g
HW
b
S PLAN
g/y
VALVE
CH
S PLAN
VALVE
br
o
C/S
BOILER
o
SL 1
IN OUT
HW
HW
C/S
ON
OFF
ON
Strain
Relief
EXAMPLE - Connection to Honeywell Evohome
(for additional information visit www.honeywelluk.com)
MAINS IN
L
N
E
Refer to Section
6
2.19
27
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