ENGLISH
31
NT_51897201_RHE-AN_130516.docx
Menu CAV
Auto
CAV
user
menu
Off
Manual Reduced speed
Manual Normal speed
Constant airflow operation (CAV)
8.2
Mode recommended to directly obtain the desired airflow in an installation.
The speed of the fans is defined to correspond to a precise airflow and to keep it constant.
The airflow rates at supply and extraction are separately controlled. The airflow instructions
Low Speed
and
High Speed
are independently controlled in m3/h in the control panel.
Pressure transmitters measure the differential pressures on the fans suction housings. The
resulting airflows of the pressure measurements are calculated by the controller versus a coefficient K
specific to each fan.
The switch over between the various set points will be done manually or automatically by a time
programming.
An IP control loop per fan maintains the set point by adjusting the fans.
A third set point, the
night speed
, may be entered via the control panel. The value in % corresponds to
the percentage of the fan’s maximum capacity; it will be used during the night for free cooling (see
corresponding function).
A 60s timeout is integrated in the program to ensure the protection of the heating elements in case a
request is made to stop the unit.
Functional parameter setting
Access to the simplified parameter setting menu (via the password 1111) allows :
The selection of Low Speed and High Speed airflows of each fan.
The night set point value of the fans.
The selection of this mode in this installer menu automatically configures the screen of the user menu.
The user can then change the unit’s operation without touching the settings.
Setting for the usage
Stop, reduced Speed, Normal Speed
= used by a manual action (via console)
Auto
= used according to clock and state of control terminal strip
(start/stop + PV/GV)
Note
: a stop by the terminals 31-32 has priority
CAV
CAV supply
800m3/h
400m3/h
80%
CAV exhaust
Man Normal speed
800m3/h
Man Reduced speed
400m3/h
Night speed
80%
Previus
screen
next screen
Parameter
CAV
Runing mode
Man Normal speed
Man Reduced speed
Night speed
