Variable air volume controllers
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51
Functions
Description
Assignment
VAV
VAV system output (0) 2 ... 10 V
Output ao1
Optional
functions
Description
Assignment
Shut-off CA Cold air shit-off
Input di1
Sensor
External temperature sensor NTC 5K
Input ai1
Shift
External shift 0 ... 10 V
(Summer / Winter compensation)
Input ai2
Configuration, settings
DIP switches
2 1
1 P-Band
normal
wide
2 di2
Stand by
Change over
Setpoint WH range:
15 … 36 °C
Input and output assignment
IRC-VAV
VAV dual-duct solution with CR 24 room controller
Dual-duct systems
max
max
min
t
R
[°C]
Heading
Supply air
temperature
Mixing Range
Cooling
Volumetric
Flow
Hot air
ht
cl
Cold air
P-band cooling
W kü
VAV dual-duct system, room temperature-controlled
Note
For technical data and a detailed description of
functions, see CR24 product information.
Note
y
y
Terminal descriptions correspond to the Belimo actuator
connection.
y
y
Mode setting for VAV controller for this application: 2 … 10 V
Control solution for VAV single-room application
VAV dual-duct system, room temperature-controlled
Stand-alone operation or integrated in a building automa-
tion system (I/O integration)
Functions
The two air volume controllers mix the hot and cold air
supplied by the dual-duct air conditioning system to
obtain the condition requested by the CR24-B1 room
temperature controller. The constant air volume (CAV)
controller for the hot air adjusts to the set max volume
for heating. The variable air volume (VAV) controller for
the cold air adds the variable amount of cold air requested
by the room temperature controller. If cooling needs
exceed the hot air volume, the hot-air part is shut off and
only cold air is supplied.
Optional:
The cold-air part can be shut off by means of a
switching contact at input d1.
Room temperature controller
CR24-B1(automatic) CR24-A1
Room temperature controller (15 … 36°C) with an inte-
grated or external temperature sensor
y
y
Mode selection with a pushbutton and three LEDs:
AUTO, ECO (reduced room temperature for standby or
night operation) and MAX (flushing operation with 15’
timer)
y
y
Room protection function (frost / excess temperature)
y
y
Inputs for cold air shut-off, external temperature sen-
sor, summer / winter compensation
y
y
VAV system output
y
y
Self-resetting start-up and service function
y
y
Tool connection for diagnostics, settings and trend
recordings
VAV-Compact control device ..MV-D3-MP
VAV-Compact control device for supply air, exhaust air
or mixing units, comprising a sensor, VAV controller and
actuator for pressure-independent air volume controls.
U
5
CR24-B1
1
3
y
5
U
5
1
3
y
5
U
5
2
~
2
~
AC 24 V
1 2
7 8
6
ao1
1
U
5
2
4
di2
3
5
ai1/di1
ai2
0...10V
_
~
External temperature
sensor
Cold air
shut-off
VAV contr. for adding cold air
CAV controller for hot air
St-By
Shift
Wiring diagram
VAV-Compact
Conventional application
