Cable Preparations; External Controls - Domestic Installations - Worcester GR8700iW 35 C Installation And Maintenance Instructions Manual

Installation
Connecting the automatic filling (accessory)
▶ Flip down the control unit( Fig. 51).
▶ Plug cables to solenoid valve.
Cables are not polarity sensitive.
Fig. 55 Connecting the automatic filling facility
5.5.2

Cable preparations

NOTICE:
Damage to control unit!
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.
Mains voltage (power cables), example  figure 56
▶ Ensure the conductors (C) can reach the appropriate terminal
connection and that the protective (earth) conductor is longer than
the other wires.
– Power cables connected to the appliance my have different
conductor lengths depending on the termination point.
230V
6-8mm
6-8mm
N
L
> C
Fig. 56 Mains voltage (power cables) preparation
Low voltage (signal cables), example  figure 57
0-30V
6-8mm
26-30mm
Fig. 57 Low voltage (signal cables) preparation
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C
5.5.3

External controls - domestic installations

Appliance external control connections example
External 230V single channel timers:
▶ Leave DHW pre-wired link in place.
▶ The electrical power supply to the external equipment [2] is supplied
from 230V OUT - L (Live), N (Neutral) and \ (earth) terminals.
▶ The Switch Live from the external equipment [3]:
– Heating/zone controls connects to (LR terminal, remove CH
pre-wired link only.
– Control for appliance Pre-heat function, optional.
Hot water time controller connects to * LR terminal, remove
pre-wired link (only use when a Worcester controller has been
fitted that does not have DHW pre-heat time control available or
no Worcester controller fitted).
▶ External frost thermostat connections [4]:
– The Live supply is terminal FS
– The Switch Live is terminal FR
1
230V AC
230V 230V
PE
IN OUT
L N L N
Fig. 58 External controls connections example
[1] 230V mains supply to the appliance.
[2] 230V supply from the appliance to the external controls.
[3] CH & DHW Switch Live (Demand) from the external controls.
[4] External frost protection Live supply and Switch Live (Demand).
Greenstar 8000 Style – 6720883864 (2019/02)
L
2
N
LR
LR
FS
FR
PC0 PW2 PW1
LR LR FS FR N L N L N L
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3
4