55
doMEStIc Hot wAtER (dHw),
RAdIAtoRS And two StAgE contRollER
RAdIAtoRS
11.0
11.2
Working Principle
Like traditional control of radiator circuit, REHAU CT2/R controls the
temperature of a circuit or Zone of Radiators that are hydraulically
independent from an underfloor heating system. The REHAU CT2/R
continually compares the required room temperature with the actual
room temperature, if the temperature is too low, it will signal the zone
valve (wired via a 24V Relay into the Master Controller) controlling the
radiators to open and start the boiler, thereby allowing hot water to flow
through the circuit.
Programming
The default programmable function allows for two timed periods per day
when the temperature of the zone is required level and allowed to fall to
a lower level outside these periods. The actual zone temperature being
measured by the sensor is displayed in the unit’s “info” menu.
The control of multiple rooms is possible, contact REHAU sales office.
If thermostatic radiator valves are employed, these can be used for
individual room control, and the REHAU CT2/R can be used as a timing
device with the high temperature setting used for maximum limiting and
the low temperature setting for frost protection.
If the whole heating system is served by radiators, and no underfloor
heating is used, then standard REHAU CT2 sensor should be used,
which will start the secondary pump, for circulation around the system.
Default Settings*
Description
21ºC*
Occupied - Zone temperature
17ºC
Setback - Zone temperature
* For altering the default settings please refer to Section 10, on page 45.
Installation
A 2-port zone valve is installed on the primary supply from boiler
to the radiators and this is wired to 24V Relay, which is controlled
by the channel output of the REHAU BA controller. That channel
output number is then set in the REHAU CT2/R controller.
Boiler
CP
TMV
TS
ZV
Manifold Flow header
Manifold Return header
ZV
BPV
PV
TRV
LSV
CP
SV
RS
Junction Box
BA Master Controller
Radiator
CT2/R
HLS
CT2/R
SV
ZV
AV
TS
CP
BPV
SV
PV
CS
RS
TMV
LSV
TRV
Radiator Controller
Safety Valve
Zone Valve
Air Vent
Temperature Sensor (Flow)
Circulating Pump
By pass Valve
Safety Valve
Pressure Vessel
Cylinder Sensor
Room Sensor
Thermostatic Mixing Valve
Lock Shield Valve
Thermostatic Radiator Valve
THERMAL ACTUATORS 24V
L
N
L
L
L
L
L
N
N
N
N
N
Out put 1
L
N
L
L
L
L
L
N
N
N
N
N
THERMAL ACTUATORS 24V
L
L
N
N
L
L
N
N
SWITCH
EXT.
I
O
+
+
T
T
LINK
DISPLAY
L
Y
N
X
SUPPLY
SENSOR
SENSOR BUS
+
T
+
T
APP
SENSOR
SENSOR BUS
MIXING VALVE
0 - 10V
MIXING VALVE 24V AC
+
T
Out put 2 Out put 3 Out put 4 Out put 5 Out put 6 Out put 7 Out put 8
Out put 1 Out put 2 Out put 3 Out put 4 Out put 5 Out put 6 Out put 7 Out put 8
A1
A2
11
14
no
12
nc
L
N
EAR
TH
Master Controller
NETWORK BUS
NETWORK BUS
ADD-ON
MODULE
WIRELESS
RECEIVER
RJ45
L
N
REHAU
T
T
+ +
24 V RELAY
ZONE VALVE ON RADIATOR CIRCUIT
NOT USED
230V AC
Mains
Supply
Brown
Blue
Green/ Yellow
Orange
Grey
REHAU CT2/R
Controller
Channel Selector
Set to Output 5
Boiler
CP
TMV
TS
ZV
Manifold Flow header
Manifold Return header
ZV
BPV
PV
TRV
LSV
CP
SV
RS
Junction Box
BA Master Controller
Radiator
CT2/R
HLS
CT2/R
SV
ZV
AV
TS
CP
BPV
SV
PV
CS
RS
TMV
LSV
TRV
Radiator Controller
Safety Valve
Zone Valve
Air Vent
Temperature Sensor (Flow)
Circulating Pump
By pass Valve
Safety Valve
Pressure Vessel
Cylinder Sensor
Room Sensor
Thermostatic Mixing Valve
Lock Shield Valve
Thermostatic Radiator Valve
THERMAL ACTUATORS 24V
L
N
L
L
L
L
L
N
N
N
N
N
Out put 1
L
N
L
L
L
L
L
N
N
N
N
N
THERMAL ACTUATORS 24V
L
L
N
N
L
L
N
N
SWITCH
EXT.
I
O
+
+
T
T
LINK
DISPLAY
L
Y
N
X
SUPPLY
SENSOR
SENSOR BUS
+
T
+
T
APP
SENSOR
SENSOR BUS
MIXING VALVE
0 - 10V
MIXING VALVE 24V AC
+
T
Out put 2 Out put 3 Out put 4 Out put 5 Out put 6 Out put 7 Out put 8
Out put 1 Out put 2 Out put 3 Out put 4 Out put 5 Out put 6 Out put 7 Out put 8
A1
A2
11
14
no
12
nc
L
N
EAR
TH
Master Controller
NETWORK BUS
NETWORK BUS
ADD-ON
MODULE
WIRELESS
RECEIVER
RJ45
L
N
REHAU
T
T
+ +
24 V RELAY
ZONE VALVE ON RADIATOR CIRCUIT
NOT USED
230V AC
Mains
Supply
Brown
Blue
Green/ Yellow
Orange
Grey
REHAU CT2/R
Controller
Channel Selector
Set to Output 5
48. Wiring Schematic for REHAU CT2/R Radiator Zone Controller
47. Hydraulic Schematic for REHAU CT2/R Radiator Zone Controller
