CAUTION
A 3 amp fused spur or an unswitched socket must be located
no more than 1 metre from the appliance.
For installation in damp rooms a fixed connection is
obligatory.
When working on the electrical circuit always isolate the
electric supply.
1. Slide the cover plate (A) (if present) to the front to remove.
2. Open the display cover and unscrew both screws to remove the front cover.
3. Pull the boiler controller unit forwards; the boiler controller will tip downwards to
provide access.
4. Consult sections § 8.3.1 and chapter 13 for making the connections.
5. After making the desired connections plug the appliance into an earthed
unswitched wall socket or connect to a fused switched spur..
8.2.1 Electrical connections
Temperature control Connector X4 Notes
Room thermostat 6 – 7 Voltage free.
Remove link 6-7
Outside temperature sensor 8 – 9 -
Frost protection thermostat 6 – 7 Parallel to room
thermostat
Power supply 24 V DC 6 – 7 – 9 6 = 24 V DC
7 = room thermostat
9 = 0 V DC
Open Therm (OT) 11 – 12 Remove link 6-7
Temperature control Connector X2 Notes
Room thermostat 230 V or
external control 230 V.
1 – 3 Remove link 6 – 7
(connector X4)
Frost thermostat 230 V 1 – 3 Remove link 6 – 7
(connector X4)
Switch live from S-plan or Y-plan onto connector X2, no.1.
See chapter 13.4 and 13.5 for complete electrical schedules.
A
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