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IN
S
TA
LL
AT
IO
N
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH
25
ELECTRICS
ELECTRICS
8-716-106-252a (03.05)
DANGER - 230v:
ISOLATE THE MAINS ELECTRICITY
SUPPLY BEFORE STARTING ANY
WORK AND OBSERVE ALL
RELEVANT SAFETY PRECAUTIONS.
IMPORTANT: OBSERVE ELECTRONIC
STATIC DISCHARGE PRECAUTIONS. DO
NOT TOUCH THE PCB CIRCUITS
Access to 230v connections:
1 Release screws (B) and remove cover panel
(C) from control box (A).
2 Release screw (D) from cable clamp (E).
Pull inner clamp part (F) outwards.
Feed sufficient power cable (G) through the
cable clamp (E) and secure grip with screw (D).
Separate wires from cable end and strip to
6mm.
230v connections (terminal block X1):
3 Connect
LIVE
wire (Brown or Red) to terminal
(
L
).
Connect
NEUTRAL
wire (Blue or Black) to
terminal (
N
).
Connect
EARTH
wire (Green/Yellow) to the
connector (
E
).
Route the power cable down the side panel using
the clip provided on the support panel to the external
connection point avoiding any potentially hot
surfaces allowing sufficient cable to open the control
box.
Any external device connected to the boiler
must take its power supply from the boiler
only and must NOT have a separate supply.
Optional external 230v programmer (terminal
block X4):
4 Connect wires as shown.
Connect earth (E) to terminal block X1.
Optional built-in 230v programmer:
5 Remove blanking plate (J).
Set the pin on the rear of the programmer to
'pumped'.
Clip programmer (H) into position as shown.
Plug into terminal block X4 and secure.
External 230v room thermostat (terminal block
X2):
6 Remove link (K).
Connect the wires as shown.
Optional external 230v 2x single pole frost
thermostats (terminal block X2):
7 Connect the wires as shown.
Two separate switched feeds are required to
ensure the correct operation of the control PCB.
Both thermostats should be installed together at
the location where frost damage could occur.
Refit electric control panel covers:
Refit panel (C) and secure with screws (B).
E
= EARTH
L
= LIVE
N
= NEUTRAL
S
= SWITCHED LIVE
G
C
B
A
B
1
D
E
F
2
X1
230v
3
6
X2
7
X2
K
J
H
5
230v
4
X1
1
N
S L
1
L
1
1
E
1
L
N
X4
X3
N
E
L
S
S
S
S