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Y-plan Wiring
PAW cylinders can be
fitted with all types of boilers and
heat pumps operating using room
and cylinder thermostats. Please
follow upper diagram:
'Wiring for Standard Heat Pump'.
Thermistor controlled Heat
Pumps/Boilers
Many popular Heat pumps now
use a thermistor principle. A
thermistor temperature sensor is
supplied with the Heat Pump to
attach to the cylinder.
Temperature information is
relayed back to the Heat Pump
control system.
A Pocket is provided (see below
to secure the sensor on the
PAW cylinder. The
probe is run through a channel
from base of cylinder to the
immersion housing and housed
there in a pocket. The thermistor
cable should be secured using
the supplied clamps in the bottom
opening of the channel. A
motorised valve must be used in
accordance with Building
Regulation G3. This is wired from
the supplied cylinder thermostat,
wired as high limit stat Please
follow lower diagram:
'Wiring for Thermistor Controlled
Heat Pump'.
Channel running
from base of cylinder
Using Additional Cylinder Thermostat
as high limit stat only:
- coil the grey temperature
probe wire inside additional
cylinder thermostat box and insert
black probe into thermostat pocket
of cylinder then turn dial on front to
number 5
8
Wiring for Standard Heat pump
Mid Position Valve
Room
(not supplied)
thermostat
T6360B
V4073A1039
1
3
2
G/Y B1
W
Gr
2
3 2
L
N
E
Isolated Mains
Supply From
1
2
3
4
Fused Spur
1
2
3
L
N
E
4
3
1
HTG
HW
HW
ON
ON
OFF
ST6400
Programmer
Wiring for Thermistor Controlled Heat Pump
Room
Mid Position Valve
thermostat
(not supplied)
T6360B
V4073A1039
1
3
2
G/Y
B1
W
2
3 2
L
N
E
1
2
3
Isolated Mains
Supply From
1 2 3
Fused Spur
L
N
E
4
3
1
HTG
HW
HW
ST6400
ON
ON
OFF
Programmer
Piping
Diagram
HP/Boiler
Cylinder Thermostat (supplied)
C
NC NO
N
O
5
6
7
8
9
2
3
L
N
E
Heat pump
Cylinder Thermostat (supplied )
wired as high limit Stat
N
C
NC NO
Gr
O
4
5
6
7
8
9
2
3
L
N
E
Heat pump differential controler
2-port valve
Mid pos. valve
(supplied)
(not supplied)
Automatic
bypass
Pump
flow
Zone Valve (DHW)
(supplied)
V4043H
G
O
B1
Br
G/Y
1
2
3
10
2
3
L
N
E
Pump
Zone Valve (DHW)
(supplied)
V4043H
G
O
B1
Br
G/Y
1
2
3
Thermistor wire
Connected to
10
Heat pump control
system
2
3
L
N
E
Pump
Radiators/
UFH
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