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4.6 Y-plan wiring layout
OSO Slimline cylinders can be fitted with all types
of boilers. Standard boilers operate using room
and cylinder thermostats. Please follow upper
diagram: 'Wiring for Standard Boiler'.
Y-plan systems with unvent-ed cylinders require
use of both a mid-position valve and the supplied
Wiring for standard boiler
Spare parts, see pt. 4.4
Piping diagram, see pt. 2.8
Wiring for thermistor controlled boiler
Spare parts, see pt. 4.4
Piping diagram, see pt. 2.8
Room
Mid Position Valve
thermostat
T6360B
1
3
2
G/Y
2
L
N
Isolated Mains
Supply From
1
2
Fused Spur
1
2
3
L
N
E
4
3 1
ST6400
Room
Mid Position Valve
thermostat
T6360B
1
3
2
2
L
N
Isolated Mains
Supply From
1
2
Fused Spur
1
2
3
L
N
E
4
3 1
ST6400
zone valve. Failure to use the zone valve contra-
venes regulations.
Both wiring plans shown is based on the use
of a 10-way Junction Box (Honey-well Part no.
42002116-001). Junction Box terminal 8 is switched
live and, if needed, terminal 10 is pump live.
(not supplied)
V4073A1039
B1
W
Gr
O
3
2
E
3
4
5
6
(not supplied)
V4073A1039
G/Y
B1
W
Gr
O
3
2
E
3
4
5
6
Thermal Cut Out/Thermostat
(supplied)
1
3
2
4
Zone Valve (DHW)
7
8
9
10
2
3
L
N
E
Boiler
Thermal Cut Out/Thermostat
(supplied)
1
3
2
4
7
8
9
10
2
3
L
N
E
Boiler
(supplied)
V4043H
G
O
B1
Br
G/Y
1
2
3
2
3
L
N
E
Pump
Zone Valve (DHW)
(supplied)
V4043H
G
O
B1
Br
G/Y
1
2
3
2
3
L
N
E
Pump
13
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