CVS-21HA.rev.03
3
The CVS-21HA controls two stages of variable speed fans as well as two
stages of either constant speed fans or heating units.
The main features of the controller are as follows:
A THREE DIGIT DISPLAY allows you to specify temperatures to within
one tenth of a degree (Celsius or Fahrenheit).
PILOT LIGHTS indicate the state of outputs, allowing you to monitor
the operation of the system without having to enter the room.
Up to FOUR INDEPENDENT TEMPERATURE PROBES can be con-
nected to the controller in order to obtain a more accurate reading of
the average room temperature and a faster reaction time.
A TEMPERATURE CURVE comprised of six different points provides
an automatic adjustment of the target room temperature over a given
period of time.
A MINIMUM SPEED CURVE comprised of six different points provides
an automatic adjustment of the first stage minimum speed over a given
period of time.
A MINIMUM VENTILATION CYCLE allows you to operate the fans
continuously or intermittently when ventilation is not required for a
cooling purpose. This reduces the level of humidity and supplies oxy-
gen to the room. It also prevents the fans from freezing in the winter.
You can choose from among TEN DIFFERENT MOTOR CURVES to
ensure that the controller supplies the correct voltage to the fan motors.
This feature provides a high degree of compatibility between controller
and fan motor.
Fuses located at the input and outputs of the controller provide
OVERLOAD AND OVERVOLTAGE PROTECTION and a connector
allows you to detect blown fuses.