13
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
RESET
RE
SET
M2
1
2
3
4
1 2
E
2
3
1
T6360B
B1
O
G
Br
G/Y
3
3 1
4
N
L
E
N
L
E
N
L
ST6400
Boiler
Pump
3
2
1
3
2
3
2
2
2
3
1
V4043H
Room
thermostat
Zone Valve (DHW)
(supplied)
Thermal Cut Out/Thermostat
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Mid Position Valve
(not supplied)
6
W
B1
G/Y
Gr
O
2
3
V4073A1039
10
4 5
9
8
7
RESET
RE
SET
M2
1
2
3
4
1 2
E
2
3
1
T6360B
B1
O
G
Br
G/Y
3
3 1
4
N
L
E
N
L
E
N
L
ST6400
Boiler
Pump
3
2
1
3
2
3
2
2
2
3
1
V4043H
Room
thermostat
Zone Valve (DHW)
(supplied)
Thermal Cut Out/Thermostat
(supplied)
Isolated Mains
Supply From
Fused Spur
L N E
Mid Position Valve
(not supplied)
6
W
B1
G/Y
Gr
O
2
3
V4073A1039
10
4 5
9
8
7
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.
Wiring for standard boiler
Wiring for thermistor controlled boiler
Spare parts, see pt. 4.4
Piping diagram, see pt. 2.8
Spare parts, see pt. 4.4
Piping diagram, see pt. 2.8
