INSTALLATION
6 720 821 670 (2018/06)
36
5.7
ELECTRICAL CONNECTIONS
▶ The mains supply to the appliance and system wiring centre must be
common, and through either a fused double pole isolator or a fused
three pin plug and unswitched socket.
▶ The isolator/socket, where practicable, should be situated next to the
appliance.
▶ The isolator must have a contact separation of 3mm minimum in both
poles.
▶ Any system connected to the appliance must not have a separate
electrical supply.
▶ External fuse rating 3A.
ACCESS TO ELECTRICAL CONTROL PANEL:
▶ Remove appliance casing to access control panel.
1. Unscrew the three screws in the control panel.
2. Remove the connections cover.
▶ Unclip cable clamp.
▶ Cut off the tapered cable entry to fit cable diameter required.
▶ Turn cable retaining screw anti-clockwise
▶ Run cable through the hole in the main crossbar marked “mains
cable” and through the cable clamp, ensure there is ample cable to
reach the connectors.
▶ Turn cable clamping screw clockwise to secure cable and replace
clamp into control panel.
3.
Mains power 230v connection (ST1):
– Separate wires from cable end and strip to 6mm
– Connect LIVE wire to terminal (L)
– Connect NEUTRAL wire to the terminal (N)
– Connect EARTH wire to earth bracket
4.
External Pump (ST2): Max power 90 W
– Connect NEUTRAL wire to terminal (Np)
– Connect LIVE wire to terminal (Lp)
– Connect EARTH wire to earth bracket
5.
Appliance Demand (from external wiring centre) (ST2):
– Connect SWITCHED LIVE wire to terminal (LR).
Fig. 35 Wiring detail
NEW COMPLETE SYSTEM INSTALLATIONS
If a new complete heating system is installed in a new build property or it
is a first time installation in an existing property, the heating systems
must conform to current building regulations Part L1a.
The exception to this are single storey, open plan dwellings where the
living area is more than 70% of the total usable floor area. Then this type
of dwelling can be controlled as one zone.
An alternative would be individual electronically controlled TRVs.
For dwellings with a floor area over 150m
2
, separate time and
temperature control for each zone is required. All radiators must have
TRVs fitted in all rooms except bathrooms and rooms with thermostats.
EXISTING INSTALLATIONS
For appliance replacements on an existing system, it is not necessary to
zone the upstairs and downstairs differently, compliance with the zone
requirements can be achieved by a single room thermostat or
programmable room thermostat.
While the system is drained down, TRVs must be fitted to all rooms
except the bathrooms and the room with the thermostat.
CAUTION:
Isolate the mains electrical supply before
starting any work and observe all relevant safety
precautions.
The appliance is already wired with a mains supply cable.
A spare strain relief block is supplied in case the pre-
wired cable is replaced.1
NOTICE:
Mains supply and system pump
▶ The appliance must have a permanent 230V power
supply to the PCB connections L, N & E.
▶ The system pump must be powered from the pump
connections on the PCB Lp, Np and the earth
bracket.
Installer connections
Connection
Function
ST1
230V supply to the appliance
•
Live input (L)
•
Neutral input (N)
ST2
External pump supply connections and Switched live
(Live Return) to the appliance
•
Pump Live (LP)
•
Pump Neutral (NP)
•
Demand input (LR)
Earth
•
Earth connection, appliance 230V supply
•
Earth connection, external pump supply
1.
2.
6720644744-25.1W
o
ST1
ST2
3.
4.
5.
ST7
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