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BLUE
G/YELLOW
ROOM STAT.
N L SW
1
2
3
4
TIME
CONTROLLER
L
N N L L
S
S
R
Fig. 32 A typical example of external 230v connection
using a mid-position zone valve
6 720 611 443 GB (05.04)
MID
POSITION
WHITE
ZONE
VALVE
CYLINDER
STAT.
1
C 2
5
6
7
8
9
10
6 720 611 443-05.1O
4.2.2
Internal 24v
Non-supplied Worcester Bosch parts required:
Description
24v Diverter valve (including
tank NTC)
TR2 room thermostat
Night set back module
Twin channel programmer
Table 10
• See section 4.1 to gain access to the boiler mains
wiring centre
• Keep the link connecting the L
• Refer to instructions supplied with each part
• Externally wired frost protection is not required as
this is provided by the boiler's internal frost thermo-
stat and the TR2 room thermostat.
Electrical connections
Part Number
7 719 002 090
7 774 901 137
7 744 901 136
7 716 192 032
and L
terminals
S
R
23
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