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Low voltage connections
9
10
11 12 13
Fig. 41 Low voltage connections
Low voltage terminal connections
9
Cylinder temperature sensor (NOT USED, unless optional
integral diverter valve kit is fitted)
10
Low Loss Header sensor (NOT USED)
11
Outdoor weather compensation sensor (NOT USED, unless
optional integral diverter valve kit is fitted and when accessory
outdoor sensor is connected)
12
External cut off switch (NOT USED)
13
Low voltage switch (NOT USED)
14
External control system with EMS bus control (NOT USED,
unless optional integral diverter valve kit is fitted)
Table 28
5.5.1
External controls (wiring centre) - domestic installations
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
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 separately, 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.
Appliance external controls connections
External equipment or Integral diverter valve kit:
▶ External diverter valve(s) and all other 230V parts
are not supplied with the boiler.
▶ There is an optional integral diverter valve kit, this
requires fitting a diverter valve, pipe, cylinder sensor
& connection.
See optional diverter valve kit instructions for full
details. This kit also allows for the Worcester plug-in
controls options to be used, which details can be
found in the diver valve kit instructions.
▶ The power supply to external controls must be taken
from the appliance; an alternative power supply must
not be used.
Greenstar i System
- 6 720 806 945 (2015/07)
ErP
14
2
, separate time and
NOTICE: Damage to appliance or external equipment!
Incorrectly wired installation can cause damage to
appliance or third party equipment.
▶ A fascia mounted digital programmer/timer cannot
be fitted unless the optional integral diverter valve kit
is installed.
▶ Only wire the external equipment to the appliance as
indicated in this section.
▶ Refer to the manufacturer's instructions when
connecting external parts to the wiring centre.
▶ Check all electrical connections are correct and
secure, Worcester, Bosch Group cannot be held
responsible for wiring errors.
External controls connection, refer to figure 42:
▶ The electrical power supply to the wiring centre is supplied from
terminals L (Live), N (Neutral) [3] & earth [1].
▶ The Switch Live from the wiring centre:
– Both pre-wired links are removed, the CH & DHW demands are
combined and wired to the
The flow temperature must be set on the central heating control to a
level at least 10 °C above the required cylinder temperature set on
the cylinder control thermostat.
▶ External frost thermostat connections:
– The Live supply is terminal FS [5]
– The Switch Live is terminal FR [5]
230V
MAINS
SUPPLY
1
2
3
4
5
Fig. 42 External controls connections
[1]
Earth connections, wiring centre
[2]
230V mains supply to appliance connections
[3]
Live & Neutral feed to wiring centre connections
[4]
CH & DHW Switch Live from wiring centre connections
[5]
External frost protection connections
If independent domestic hot water and central heating
flow temperature control is required, the optional
integral diverter valve kit must be fitted.
Installation
terminal.
(Live supply to wiring centre)
(Neutral supply to wiring centre)
(Earth to wiring centre)
(Switch live from wiring centre)
(Frost Stat Out)
(Frost Stat In)
6720806945-09.2Wo
35
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