Belimo CR24 Series User manual
Product information CR24-..
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
CR24-.. Single room controllers
Table of contents
Overview of the system 2
Overview of functions 3
Technical data sheets
CR24-B1 / CR24-A1 Single room controllers
CR24-B2 / CR24-A2 Single room controllers
CR24-B2E / CR24-A2E Single room controllers
CR24-B3 / CR24-A3 Single room controllers
5
7
9
13
Operation 15
Functions
Setpoint calculation
Energy hold off / Stand-by / VAV-Function
Electric air heater / External temperature sensor / Supply air temperature limitation
External setpoint shift / Air flush
Change-over
Boost
Chilled ceiling
Rolling start / Excess temperature protection / Step control
17
18
19
20
21
22
23
24
Dimensions, Installation, Commissioning, Service 25
Overview of the system
CR24-..
2www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
VAV applications
Single room controllers
Water applications
Air applications
CR24-B1 CR24-B2E CR24-B3CR24-B2
Compact Universal
Rotary actuators and
control ball valves
Damper actuators
Overview of functions CR24-..
www.belimo.com 3
Product information S4-CR24-.. • en • v2.2 • 05.2010 • Subject to changes
Brief description
The new developed CR24-.. controller generation provides the foundation for modern single room
concepts.
The technology, functionality and handling of the new microprocessor-controlled room tempera-
controlling elements.
Device variants
Standard CR24-B.. type with operator panel
Type CR24-A..: same functionality as the
CR24-B
Notes
Unless otherwise expressly mentioned, all refer-
ences contained in this document to the CR24-B..
also apply to the CR24-A...
Accessories
Type Descrition
Mechanical accessories CRZA-A
CRZA-B
CRZW
Overview of functions
CR24-..
4www.belimo.com
Product information S4-CR24-.. • en • v2.2 • 05.2010 • Subject to changes
Overview of CR24-B.. functions CR24-B1 CR24-B2 CR24-B2E CR24-B3
Power supply ••••
Application / Temperature range
– Room temperature control in comfort zone ••••
••••
••••
Operation ••••
••••
••••
••••
Inputs 4
– Energy hold off ••••
•1) •••
– Change-over •1) •2)
– Chilled ceiling with dew point limiting and change-over •2)
• •
– Boost ••2)
••••
••••
Outputs 2 3 3
•3)
•••
•••
•
•4)
Functions
– Control characteristics P P P
••••
max •
– Boost function temperature-controlled •
•••
– Internal function test, including nominal voltage test ••••
••••
••••
Mounting
Surface mounting with flush-mounted or surface-mounted connection ••••
Housing colors
••••
1)
change-over application.
2)
3)
controller applications.
4)
as a cooling or heating output.
Additional documentation
Comprehensive and regularly updated documentation with descriptions of specific applications is
Technical data sheet CR24-B1
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Technical data
Electrical data
without actuators
Power supply range
Connections 2
2
Functional data Control characteristics P
–
for example Belimo type
setpoint
– Energy hold off
–
–
Inputs 2 x analog, 2 x digital
– External temperature sensor , sensing range
– External setpoint shift corresponds to
– Digital inputs Contact rating
Outputs
–
Norms und standards Protection class III Safety extra-low voltage
Degree of protection
Mode of operation
Software class
EMC
– Operation
– Transport and storage
Dimensions / Weight
Housing colors
Baseplate
Cover
Temperature controllers for single room
applications with one analog output:
• The analog output ao1 can be used in VAV
applications to contol one or more
VAV controllers.
• In change-over applications, the analog
output ao1 can be changed over from coo-
ling to heating mode via an input.
Safety notes
!
• The controller is not allowed to be used outside the specified field of application,
especially in aircraft or in any other airborne means of transport.
• It may only be installed by suitably trained personnel.
All applicable legal or institutional installation regulations must be complied with.
• The device may only be opened at the manufacturer's site. It does not contain any parts that can
be replaced or repaired by the user.
• The device contains electrical and electronic components and is not allowed to be disposed of as
household refuse. All locally valid regulations and requirements must be observed.
Device variants
Single room controller with one analog output
CR24-B1
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Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Electrical installation
Wiring diagram
1 2 6 7 8
• • •
0...10
V
AC 24 V
NTC
CR24-B1
ai/di1 di2 ai2
ao1 U5
1
U5
2
T
~
–
Conguration / Principal diagramm
Y [V]
t
R
[°C]
10
2
0
W
C
V
max
.
V
min
.
Y [V]
t
R
[°C]
W
H
10
2
0
W
C
V
max
.
V
min
.
Conguration
DIP
Default
settings
1normal wide
2Input di2
Stand-by
Input di2
Change-over
1 2
Product features
Energy hold off
-
stance in a room with an open window.
Stand-by -
ced or the cooling setpoint is slightly increased, for instance in a room that is temporarily unoccu-
pied.
Frost
Change-over
External temperature sensor
measure the average room temperature in the exhaust air duct.
External setpoint shift
These functions are described in detail on pages 17 to 24.
Inputs Outputs
3 External temperature sensor 6
Energy hold off Other connections
4di2 7
5ai2 External setpoint shift 8PP2
Notes
• Connect via safety isolation transformer.
!
Key
Y [V] Output voltage in volt V'max Maximum volume flow
tR[°C] Room temperature in degrees centigrade V‘min Minimum volume flow
WH
WCCooling setpoint
Technical data sheet CR24-B2
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Technical data
Electrical data
without actuators
Power supply range
Connections 2
2
Functional data Control characteristics P
–
for example Belimo type
setpoint
– Energy hold off
–
–
Inputs 2 x analog, 3 x digital
– External temperature sensor sensing range
– External setpoint shift corresponds to
– Digital inputs Contact rating
Outputs 2 x analog
–
–
Norms und standards Protection class III Safety extra-low voltage
Degree of protection
Mode of operation
Software class
EMC
– Operation
– Transport and storage
Dimensions / Weight
Housing colors
Baseplate
Cover
Temperature controllers for single room
applications with two analog outputs:
• The analog output ao1 can be used in VAV
applications to contol one or more
VAV controllers.
• The analog heating output ao3 supplies a
3-point signal.
Safety notes
!
• The controller is not allowed to be used outside the specified field of application,
especially in aircraft or in any other airborne means of transport.
• It may only be installed by suitably trained personnel.
All applicable legal or institutional installation regulations must be complied with.
• The device may only be opened at the manufacturer's site. It does not contain any parts that can
be replaced or repaired by the user.
• The device contains electrical and electronic components and is not allowed to be disposed of as
household refuse. All locally valid regulations and requirements must be observed.
Device variants
Single room controller with two analog outputs
CR24-B2
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Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Conguration / Principal diagramm
Y [V]
tR[°C]
WH
10
2
8.4
0
WC
Vmax
.
Vmin
.
VmaxH
.
ao3 ao1
Product features
Energy hold off
-
stance in a room with an open window.
Stand-by -
duced or the cooling setpoint is slightly increased, for instance in a room that is temporarily unoc-
cupied.
Frost
Air ush V’max
conference rooms, hotel rooms etc.
External temperature sensor
measure the average room temperature in the exhaust air duct.
External setpoint shift
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
ao1ao3 U51U52
Inputs Outputs
3 External temperature sensor 6
Energy hold off 9/10 ao3
4di2 Other connections
5ai2 External setpoint shift 7
12 di3 8PP2
Conguration
DIP
Default-
settings
1normal wide
2max heating off max heating 80%
1 2
Legende
Y [V] Output voltage in volt ao..
tR[°C] Room temperature in degrees centigrade V‘max Maximum volume flow
WH V‘maxHMaximum volume flow heating
WCCooling setpoint V‘min Minimum volume flow
Air flush
Notes
• Connect via safety isolation transformer.
!
Technical data sheet CR24-B2E
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Technical data
Electrical data
without actuators
Power supply range
Connections 2
2
Functional data Control characteristics P
–
for example Belimo type
setpoint
– Energy hold off
–
–
Inputs 2 x analog, 3 x digital
– External temperature sensor , sensing range
– External setpoint shift corresponds to
– Digital inputs Contact rating
Outputs
–
–
Norms und standards Protection class III Safety extra-low voltage
Degree of protection
Mode of operation
Software class
EMC
– Operation
– Transport and storage
Dimensions / Weight
Housing colors
Baseplate
Cover
Temperature controllers for single room
applications with one analog output and two
digital outputs:
• The analog output ao1 for cooling, e.g. in
VAV applications to contol one or more
VAV controllers.
• The digital heating output do3 for
– electrical reheater with one or two
stages, in binary mode with three stages
– on/off radiator valve
Safety notes
!
• The controller is not allowed to be used outside the specified field of application,
especially in aircraft or in any other airborne means of transport.
• It may only be installed by suitably trained personnel.
All applicable legal or institutional installation regulations must be complied with.
• The device may only be opened at the manufacturer's site. It does not contain any parts that can
be replaced or repaired by the user.
• The device contains electrical and electronic components and is not allowed to be disposed of as
household refuse. All locally valid regulations and requirements must be observed.
Device variants
Single room controller with one analog output
and two digital outputs
CR24-B2E
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Product features
Energy hold off
-
stance in a room with an open window.
Stand-by -
duced or the cooling setpoint is slightly increased, for instance in a room that is temporarily unoc-
cupied.
Frost
Boost max
maximum capacity.
Supply air temperature limiter
V'max at heating
Output mode
–stage
–binary, stage II:
Soft start (Roll-out feature)
helps to avoid service calls due to switched-off safety chains and reduces the electrical load after
a power-fail.
External setpoint shift
These functions are described in detail on pages 17 to 24.
Conguration / Prinzipal diagram
II
I
Y [V]
Boost
t
R
[°C
]
10
8.4
2
0
VmaxH
.
Vmin
.
Vmax
.
ao1
WHWC
do3
Key
Y [V] Output voltage in volt ao1 Cooling output
tR[°C] Room temperature in degrees centigrade
WH do3
WCCooling setpoint
V'max Maximum volume flow
V'maxHMaximum volume flow heating
V'min Minimum volume flow
Conguration
DIP
Default-
settings
1 Binary mode
2max heating off max heating on
1 2
Single room controller with one analog output
and two digital outputs CR24-B2E
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Electrical installation
Wiring diagram
13
y
5
U5
2
~
VAV 2
a) b)
CR24-B2E
13
y
5
U5
12 7 8611109
ao1 U5 1U5 2
4123 5
di2 di3ai/di1 ai2
0...10V
_
NTC
~
AC 24 V
2
~
VAV 1
I
II
°C°C
13
y
5
U5
12 7 8611109
2
~
VAV 1
ao1 U5 1U5 2
do3/1
do3/1 do3/2
Note
• Connect via safety isolation transformer.
!
Inputs Outputs
3 Supply air temperature limiter 6
Energy hold off 9
4di2 10
5ai2 External setpoint shift Other connections
12 di3 Boost 7
8PP2
(optional)
single or multi stage
Local safety
chain *
* Note:
Installation and safety circuit
according to local laws and
regulations !
Stage I Stage I II
Electrical reheater
Electrical reheater
a) Parallel connection
b) Master-Slave connection
On/off valve
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Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Technical data sheet CR24-B3
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Technical data
Electrical data
without actuators
Power supply range
Connections 2
2
Functional data Control characteristics
–
for example Belimo type
setpoint
– Energy hold off
–
–
Inputs 2 x analog, 3 x digital
– External temperature sensor , sensing range
– External setpoint shift corresponds to
– Digital inputs Contact rating
Outputs 3 x analog
–
–
–
Norms und standards Protection class III Safety extra-low voltage
Degree of protection
Mode of operation
Software class
EMC
– Operation
– Transport and storage
Dimensions / Weight
Housing colors
Baseplate
Cover
Temperature controllers for single room
applications with three analog outputs:
• The analog output ao1 can be used in VAV
applications to contol one or more
VAV controllers.
• The analog output ao2 can be used to
control a heating or cooling sequence
(change-over).
• The analog heating output ao3 supplies a
3-point signal.
Safety notes
!
• The controller is not allowed to be used outside the specified field of application,
especially in aircraft or in any other airborne means of transport.
• It may only be installed by suitably trained personnel.
All applicable legal or institutional installation regulations must be complied with.
• The device may only be opened at the manufacturer's site. It does not contain any parts that can
be replaced or repaired by the user.
• The device contains electrical and electronic components and is not allowed to be disposed of as
household refuse. All locally valid regulations and requirements must be observed.
Device variants
Single room controller with three analog outputs
CR24-B3
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Product features
Energy hold off
instance in a room with an open window.
Stand-by
reduced or the cooling setpoint is slightly increased, for instance in a room that is temporarily
unoccupied.
Frost
Change-over
Chilled ceiling with dew point limiting
Boost max
maximum capacity.
External temperature sensor
measure the average room temperature in the exhaust air duct.
External setpoint shift
These functions are described in detail on pages 17 to 24.
Electrical installation
Wiring diagram
1 2 9 10 11 6 7 8
3 4 12 5
~
0...10 V
+
AC 24 V
NTC
CR24-B3
ai/di1 di2 di3 ai2
ao1ao2ao3 U51U52
Conguration / Prinzipal diagram
Y [V] Boost
tR[°C]
10
2
8.4
0
V
max
.
V
min
.
V
maxH
.
ao3
ao1
ao1
ao2
W
H
W
C
Conguration
DIP
Default-
settings
1normal wide
2max heating off max heating 80%
3Output ao2
Output ao2
Change-over
Cooling
4Input di3
Boost
Input di3
Change-over
Dew point
5Boost
Temperature
controlled
Boost
max
6Control characteristic
PI
Control characteristic
P
123456
Key
Y [V] Output voltage in volt ao..
tR[°C] Room temperature in degrees centigrade V'max Maximum volume flow
WH V'maxHMaximum volume flow heating
WCCooling setpoint V'min Minimum volume flow
Inputs Outputs
3 External temperature sensor 6
Energy hold off 9/10 ao3
4di2 11 ao2
5ai2 External setpoint shift Other connections
12 di3 7
8PP2
Note
• Connect via safety isolation transformer.
!
Operation CR24-..
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
12
Mode switch and status indication
• AUTO – optimum comfort mode
The room is heated, cooled or ventilated with the highest level of com-
• ECO – optimum energy mode
only irregularly occupied resp. at reduced demand.
• MAX – boost function
The room is ventilated with the maximum air volume or heated or
and ventilation functions are active.
– timer elapsed
Measuring point terminals
Internal function test
Control sequence simulation
The connected actuators, and thus also the heating and cooling control
PC-Tool connection
Operator level 1 – Operation Operating mode / Setpoint CR24-B.. only
DIP switches for configuration
Basic setpoint adjustment
Label for settings
Operator level 2 – Configuration Application / Parameters all CR24-..
Operator level 3 – Service Test / Simulation all CR24-..
Rotary knob
for setpoint adjustment
Mode switch
•
• ECO
•
Status indication
•
•
•
O
rder-Nr
.
Order-Nr.
CR24-B2xxxxx
W
H
U5/
2
U5/
1
123456
ON
OFF
21
36
15
Measuring
point terminals
PC-Tool connection
Internal function test
Basic setpoint adjustmentDIP switches for configuration
Label for settings
1
2
3
4
5
6
7
8
Rotary knob
for control sequence simulation
9
10
11
12
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Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Functions CR24-..
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Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Introduction CR24-B.. only
setpoint.
Both the level of comfort and the energy saving
Operating status Heating setpoint Cooling setpoint
Comfort
Stand-by
Energy hold off
Frost
Setpoint calculation
Examples Comfort Stand-by
Y
t
R
10
2
0
Energy hold off
Stand-by
Basic setpoint WH
Cooling
Heating
±3 K Setpoing adjustment Setpoint shift 0...10 V
Dead band
Frost
Comfort heating setpoint WA
VAV
Y
tR
+1 K Dead band
23°C Comfort heating setpoint WA
Y
tR
+1 K Dead band
23°C Comfort heating setpoint WA
+3 K Stand-by offset cooling
–2 K Stand-by offset heating
Functions
CR24-..
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Y [V]
t
R
[°C]
W
A
10
2
0
V
max
.
V
min
.
Y [V]
t
R[°C]
W
A
10
8.4
2
0
ao1ao2ao3
ao1
V
max
.
V
min
.
protection settings in energy saving mode, in other words the heating
-
-
Typical applications
-
-
tion limit is reached.
Notes
– If an external temperature sensor is used, the frost limit is monitored
– Due to the automatic sensor detection the change into energy hold off
Typical applications
the energy consumption of unoccupied rooms.
Y [V]
t
R
[°C]
W
A
10
2
0
V
max
.
V
min
.
1 2
4
~
+
di2
AC 24 V
CR24-B..
Stand-by
Stand-by
Energy hold off Digital input di1 all CR24-..
Stand-by Digital input di2 all CR24-..
e.g. for:
– Providing or assisting heating with air.
VAV function: air volume in heating mode (Reheater) CR24-B2 und CR24-B3 only
CR24-B2 configuration
1 2
CR24-B3 configuration
61 2 43 5
V'max heating
closed
1 2
3
~
+
ai/di1
AC 24 V
NTC
CR24-B..
Energy hold off
Energy hold off
Key
Y Output signal
tRRoom temperature
WACurrent setpoint
Key
Y Output signal
tRRoom temperature
WACurrent setpoint
Key
Y Output signal
tRRoom temperature
WACurrent setpoint
Functions CR24-..
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
e.g. for:
– Provision without assisting heating with air
Electric air heater CR24-B2E only
1 2
3
ai/di1
NTC
CR24-B..
AC 24 V
T
~
Typical application
exhaust air duct.
Notes
– The internal sensor automatically detects the presence of an external
sensor.
-
External
temperature sensor
External temperature sensor Analog input ai1 CR24-B1, CR24-B2, CR24-B3
[°C]
30
40
50
60
70
80
[°C]
30
40
50
60
70
80
-
vidual load increments if the maximum temperature is exceeded. This
results in an almost modulating control characteristic.
Notes
– The controller automatically detects the presence of a supply air limi-
tation sensor.
Supply air temperature limitation Analog input ai1 CR24-B2E only
1 2
34 5
AC 24 V
NTC
CR24-B2E
ai/di1 di2
12
di3 ai2
T
~
Time
Supply air
temperature
Mean value 45...46°C
Supply air
temperature
Time
EHO
II
I
Y [V]
t
R
[°C]
10
8.4
2
0
do3
X
P
H
X
P
C
ao1
W
H
W
C
V'max
V'min
closed
Volumetric flow
V'maxH
Key
Y Output signal
tRRoom temperature
WH
WCSetpoint Cooling
XPH
XPC
V'maxHmax
CR24-B2E configuration
This function is activated using DIP switch 2.
1 2
External
temperature sensor
Without supply air limitation With supply air limitation
Functions
CR24-..
www.belimo.com
Product information S4-CR24-.. • en • v2.3 • 08.2022 • Subject to changes
Y [V]
tR[°C]
WA
10
2
0
1 2
12
~
+
di3
AC 24 V
CR24-B2
1 2
5
~
0...10 V
+
ai2
–
AC 24 V
CR24-B..
Typical application
Setpoint shift
Air flush
Air flush
The CR24-B2 controller allows override control at the digital input di3, to
max
Typical applications
– Purging conference rooms, hotel rooms etc.
Notes
max
– The heating output ao3 remains in the normal control mode and
External setpoint shift Analog input ai2 all CR24-..
Air flush Digital input di3 CR24-B2 only
Notes
-
Auto
Air flush
W [°C]
S [V]
5.00
26
21
16
10
Key
W Setpoint
S Shift signal
Key
Y Output signal
tRRoom temperature
WACurrent setpoint
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