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INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH
26
ELECTRICAL DIAGRAM
ELECTRICAL DIAGRAM
8-716-106-252a (03.05)
Electrical components:
1 Printed circuit board
2 Thermostat - boiler high limit
3 Thermostat - DHW control
4 Thermostat - CH control
5Indicator lamp - power on
6 Indicator lamp - lock-out
7 Flue manual reset thermostat
8 Boiler manual reset thermostat
9 Manual reset - lock-out
10 Optional fascia mounted programmer
11 Plug in connector to burner control
12 Plug in connector from burner control
13 Burner control box
14 Flow switch
15Circulating pump
16 Diverter valve
Wire colour code:
br - Brown
bl - Blue
gy - Green/Yellow
r - Red
w - White
y - Yellow
g - Grey
bk - Black
or - Orange
pk - Pink
X4
X3
X12
X11
X2
X13
X9
X1
X10
X8
X7
X6
gy gy
blbr
gy
or
bl
br
g
gy
bl
br
gy
bl
br
g
pk
or
y
pk
pk
pk pk
y y
y y
bk r
g gy w
1 2 3 4 5 6
r r
r r
r
g
or
4
3
2
3
2
w
2
3
4
or pk y
w w
w
w
9
8
7
6
5
4
3
2
1
bk r
g gy w
g
bk
br
w
g
1 2 3 4 5 6
A
g bk r gy w
bl
br
gy
bl
br
gy
or
bl
br
g
230v
bl
br
w
g
w
1
2
3
4
5
6
7
8
9
10
14
15
16
12
13
11
