Bosch WORCESTER GREENSTAR WIRING CENTRE, Installation, Commissioning & Servicing Instructions

Page: 5 / 16

INSTALLATION
6 720 804 107 (2012/10) 5
DIN RAIL MOUNTING
▶ Mount the module to a DIN rail (

fig. 7).
Fig. 7 DIN rail mounting
▶ Observe fig. 8 when removing the component from the DIN rail.
Fig. 8 Removal from DIN rail
3.2 ELECTRICAL CONNECTIONS
Fig. 9 Secure together the wires of every cable connected.
▶ Observe current regulations applicable to power connections, and
use at least cable type H05 VV-…
3.2.1 CONNECTION OF BUS AND TEMPERATURE SENSOR
(

24 V)
Maximum total length of BUS connections:
• 100 m at 0.50 mm
2
conductor cross-section
• 300 m at 1.50 mm
2
conductor cross-section
▶ All LV leads must be routed separately from cables carrying mains
voltage to avoid inductive interference (minimum separation
100 mm).
▶ In the case of inductive external interference (e.g. by PV systems), use
shielded cables (e.g. LiYCY) and earth the shield on one side. Do not
connect the shield to the grounded terminal of the module, but to a
building ground terminal, e.g. a free ground terminal or a water pipe.
▶ Connect 1 pair of BUS terminals (BUS 1 and BUS 2) to the BUS
terminals of the boiler.
▶ Connect the cylinder temperature sensor supplied to the terminal
TC1.
When sensor leads are extended, apply the following lead cross-
sections:
• Up to 20 m with 0.75 mm
2
to 1.50 mm
2
conductor cross-section
• 20 m up to 100 m with 1.50 mm
2
conductor cross-section
▶ Route cables through the grommets provided and connect them as
described in chapter 3.2.3.
3.2.2 CONNECTION TO MAINS POWER, PUMP AND VALVES
(230 V AC)
DANGER: Risk of electric shock!
▶ Secure together the wires of every cable connected.
This can be done by stripping a short section of cable
sheath or with cable ties close to the terminals
(

fig. 9).
6 720 804 106-07.1O
6 720 804 106-08.1O
2.
3.
1.
6 720 647 922-40.1O
If the maximum cable length of the BUS connections
between all BUS subscribers is exceeded or if the BUS
system is realised as a ring structure, the system cannot
be commissioned.
For hot water cylinders without sensor pockets, use the
cylinder sensor retaining device to mount the cylinder
temperature sensor securely to the side of the cylinder.
The connection to mains power, pump and valves may
differ depending on the system installed. The following
description is a suggestion how to carry out the electrical
connection of the module.
DANGER: Risk of electric shock!
If the heating system is wired in such a way that the
Greenstar wiring centre and boiler have separate points
of isolation (

fig. 10, page 6):
▶ Attach a warning label to each point of isolation. This
label has to advise that it is not the sole point of
isolation and it has to identify the location of the other
means of isolation.
▶ Electrically isolate the boiler and system
components. Secure against unintentional
reconnection and make sure the power supply is
disconnected.