Page 29
INSTALLATION
WIRING DIAGRAMS
L N E
Mains supply
230VAC ~ 5 Amp
5
A
Local
double
pole
isolator
Boiler pump
Boiler wiring terminals
L N E SL L N E
boiler
pump
CH & HW Programmer
HW
OFF
HW
ON
CH
OFF
CH
ON
L
N
1
4
3
2
Br
Br
Room Thermostat
ON
OFF
1
E
2
4
3
Store stat
ON
OFF
C
E
1
2
1
2
3
4
5
6
7
8
9
10
11
12
E N L
Central heating
pump
L N E
Torrent ECO with 2 pump heating control system and typical solar heating system
PRV
Solar
pumping
station
Solar panels
S1
S1 : Solar flow temperature sensor
S2 : Solar zone store temperature sensor
S3 : Store overheat temperature sensor/Thermostat
P1
S2
S3
Torrent ECO SOL
E
C
NC
Junction
Solar controller
Overheat
thermostat
(S3)
L N E L N E S2 S1
Solar
Pump
230Vac
50Hz
supply
L N E SL
N
L
E
1
2
3
E
C
1
2
on
off
NOTE
Some solar controllers, the overheat protection is provided by a temperature sensor,S3,
which is wired directly to the solar controller same as sensors S1 and S2
In this case the mechanical overheat thermostat (S3) shown in this diagram is not required and
the solar pump is wired straight to the solar controller.
NOTE
As part of system setup and commissioning, it is important that this boiler hold-off pipe thermostat
be adjusted to find the best setting for each individual installation.
Failure to do so will give under performance of either the boiler or the solar heating system
Normally Closed
2 Port Valve
Normally Open
2 Port Valve
E
E
L
N
N
SL
PL
ML
Control Stat 2
1
C
2
Pipe Thermostat 1
1
C
2
on
off
on
off
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
Temperature range: 50 – 95°C
Boiler hold off pipe thermostat
Type LL641B1012
Typical thermal store
temperature set point 75-77°C,
must be set at a temperature
which prevents the contents
of the thermal store exceeding
100°C. See page 26 for further
guidance. Installer must set the
thermostat correctly during
commissioning.
