Belimo CR24 Series, Product Information

Page: 8 / 32

Single room controller with two analog outputs
CR24-B2
8 www.belimo.com
Pr
oduct information S4-CR24-.. • en • v2.3 • 08.2022 • Subject t
o changes
Configuration / Principal diagramm
Y [V]
t
R
[°C]
W
H
10
2
8.4
0
W
C
V
max
.
V
min
.
V
maxH
.
ao3 ao1
Product features
Energy hold off
In energy saving mode, the room temperature is reduced to building protection level, i.e. either the
heating setpoint is significantly reduced or the cooling setpoint is significantly increased, for in -
stance in a room with an open window.
Stand-by
The room temperature is reduced to stand-by level, i.e. either the heating setpoint is slightly re -
duced or the cooling setpoint is slightly increased, for instance in a room that is temporarily unoc-
cupied.
Frost
The frost protection function is activated if the actual room temperature falls below 10°C.
Air flush
The room can be ventilated with the maximum volume flow ( V ’
max
), for instance in order to purge
conference rooms, hotel rooms etc.
External temperature sensor
An external temperature sensor can be connected to the analog input ai1, for instance in order to
measure the average room temperature in the exhaust air duct.
External setpoint shift
An external DC 0...10 V signal at the analog input ai2 can be used to shift the basic setpoint 0...10
K, for instance for the summer/winter compensation.
These functions are described in detail on pages 17 to 24.
Electrical installation
Wiring diagram
1 2 9 10 6 7 8
3 4 12 5
0...10
V
~ +
AC 24 V
NTC
CR24-B2
ai/di1 di2 di3 ai2
ao1 ao3 U5
1
U5
2
Inputs Outputs
3
ai1 External temperature sensor 6 ao1 System output for Belimo VAV controller
di1 Energy hold off 9/10 ao3 Heating (3-point)
4 di2 Stand-by Other connections
5 ai2 External setpoint shift 7 PP1 Diagnostics socket 1
12 di3 Air flush 8 PP2 Diagnostics socket 2
Configuration
DIP
Default-
settings
1 P-band normal P-band wide
2 V′
max
heating off V′
max
heating 80%
1 2
Legende
Y [V]
Output voltage in volt ao.. Analog outputs
t
R
[°C] Room temperature in degrees centigrade V‘
max
Maximum volume flow
W
H
Heating setpoint V‘
maxH
Maximum volume flow heating
W
C
Cooling setpoint V‘
min
Minimum volume flow
Air flush
Notes
• Connect via safety isolation transformer.
• Parallel connection of other actuators possible.
Note the performance data.
!