Rev. d 01/1 39
DMP052E
Obstructed filter
: the pressure switch (7) signals, to R2 controller, the presence of obstructed filter
if the differential pressure before and after the filter, increases over the set value. This information
is sent to supervisor via LinkBus and controller R1.
Possible Variants:
set-point of heating/cooling loops (Ao1 output) compensated by outside air
temperature sensor connected to SC input, or remote set-point by potentiometer. In summertime,
in the control loop, the function “max humidity limit” is enabled on proportional valve (4) depending
on 0-100% signal, coming from SH of R1 humidity transmitter and on the adjusted set and humidity
limit proportional band.
If the cooling request due to limit loop (de-humidification) is higher than that the temperature one,
the controller will give priority to the de-humidification request (the limit loop signal is prevailing), by
cooling more in order to condensate more humidity on supply. Possible management of both
proportional and on/off post-heating on the R2 controller Loop. It is possible to carry out direct
control of room humidity through proportional humidifier.
It is possible to manage separately the return air fan with switch-on delay, with respect to the
supply air fan on R2 controller. It is possible to use the remaining unused loop functions of R2
controller.
EXAMPLE 5
:
AIR HANDLING UNIT WITH RETURN AIR AND ENTHALPY CONTROL OF DAMPERS
Enthalpy damper control: THIS APPLICATION REQUIRES TWO W500H
This application is an extension of the example 4, where more functions of R1 controller are
performed.
