Bosch WORCESTER Greenstar Heatslave II External 12/18 Installation, Commissioning And Servicing Instructions page 30

Installation
C
1
2
G H
E
Low voltage terminal strip
1 NOT USED
2 EMS BUS connection
3 Service mode switch
4 Outdoor compensation sensor
5 NOT USED
6 NOT USED
Fig. 47
DANGER: 230 Volts
Isolate the mains electricity supply before starting any
work and observe all relevant safety precautions.
Frost protection
The boiler has built in frost protection to protect the appliance and the
system within the heated building.
30
D
B
Mains voltage socket (provided)
B Shown here from top view, N L
wiring access is from other side.
NOTE: on both plug & socket
Earth is wired centrally.
Mains supply plug (pre-wired)
A Mains supply plug & lead is
pre-wired to the boiler control
box, see diagram & table below
A
Pre-wired links
Mains voltage terminal strip
7 External 230V AC frost thermostat
8 230V AC awitch live inputs
9 230V AC mains output to wiring centre
10 NOT USED
11 NOT USED
12 NOT USED
13 Bioler 230V AC mains supply pre-wired to plug
Fig. 48 External 230 V Twin Channel Programmer and Room
Thermostat
Frost Thermostat
Wiring to Part L
zoned controls
Fig. 49 Optional External 230 V AC Frost Stat Connection for
protection of system pipework in unheated air space
▶ Connect frost thermostat cables to terminals FS & FR.
– These connections are not polarity sensitive.
– The Boiler internal frost protection will bring on the burner if
required.
Greenstar Heatslave II External
Pipe Thermostat
230V
MAINS
SUPPLY
ENL
2022+ 6 721 843 980 (2022/01)