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Installation
5.5
Electrical
DANGER: Danger to life through electric shock!
▶ Before carrying out any work on electrical
components, isolate them from the power supply
(230 V AC) (fuse, circuit breaker) and secure against
unintentional reconnection.
The appliance is pre-wired with a mains supply cable.
A spare strain relief block is supplied in case the pre-
wired cable is not used.
• The mains electrical supply to the appliance must be through either a
fused double pole isolator or a fused three pin plug and unswitched
socket.
• The isolator shall be situated next to the appliance for new systems
and, where practicable, replacement appliances.
• 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 connections:
▶ Remove appliance casing to access control panel( section 5.3.1).
Refer to figure 38.
▶ Loosen the captive screw securing the control panel.
▶ Lower the control panel into the horizontal service position.
▶ Release the latches [1] of the cover off the catches securing the
connections cover.
1
Fig. 38 Moving control panel into the service position
NOTICE: Damage to control box!
Small pieces of wire can cause shorts and damage to
electronics.
▶ When stripping wires always ensure copper strands
do not fall into the control box.
Refer to figure 39
▶ Hinge open the connections cover [2] and use side retainers to lock
in position.
▶ Wire any mains voltage equipment (timers, room thermostats etc. in
the appropriately marked connector) within the mains voltage
connections side [1].
The low voltage connections are only used when the optional integral
diverter valve kit is fitted.
▶ Wire any low voltage equipment (EMS BUS controller, outdoor
sensor etc. in the appropriately marked connector) within the low
voltage connections side [3].
– The low voltage connectors are contained in a bag inside the
connections cover (it is advised to fit the edge connectors even if
there are not used).
34
2
6720806944-17.1Wo
3
2
1
Fig. 39 Accessing the installer connections
▶ Pass the 230 V mains power cable, from the control box, through the
grommet at the right hand side of the pre-plumbing manifold and
route to the mains isolator next to the appliance.
Mains voltage connections
1
2
3
Fig. 40 Mains voltage connections
Mains voltage terminal connections
1
Earth connections
2
Appliance 230V mains supply
3
230V mains output to external controls/wiring centre
4
230V switched live inputs
• CH - External controls switch live connection point.
• DHW - Inactive unless optional integral diverter valve fitted.
5
External frost thermostat connections
6
DHW circulation pump (NOT USED)
7
DHW charge pump (NOT USED)
8
CH circulation pump (NOT USED)
*
Pre-wired links (remove links when connecting external
controls/wiring centre)
Table 27
NOTE: DHW LR (Live Return) switched live - with
optional integral diverter valve only.
▶ This input provides connection for a proprietary
external twin channel time control for the DHW
cylinder, (link must be removed).
If an external twin channel control is not fitted, the
link must be in place to ensure a cylinder demand.
All Worcester twin channel digital controls provide
this functionality.
Greenstar i System
4
5
6
7
8
- 6 720 806 945 (2015/07)
ErP
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