Rev. d 01/1 40
DMP052E
OPERATION
R1 Controller time controls with PI action the outside temperature on return air sensor (2) driving
valve (4) on heating (4A) and cooling (4B) batteries. It carries out control by driving on the same
output of two actuators (one set as “reverse” 1-5 Vdc, the other as “direct” 6-9 Vdc) with output at
5.5 Vdc when the set is satisfied. Room humidity supplied by the transmitter (3) is maintained
above/equal to set point by on/off humidification (9).
The outside dampers (inlet and exhaust) and supply air damper are driven by only one analogue
output and by the apposite direct/reverse set of the relevant actuator (Max Outside opening = Min
return air) or with proper leverage. If the outside Enthalpy (outside air temperature sensor (10) and
outside humidity transmitter (11)) is higher than the internal one (Return air temperature sensor (2)
and return air humidity transmitter (3)) the controller will give priority to outside air in winter and
vice versa in summer.
R1 controller receives the information about outside humidity percentage via LinkBus through
controller R2.
Moreover, the R2 controller provides the control of summer supply temperature through post-
heating valve/coil (12) and supply air sensor (13).
It is possible a separate control of return air fan with switch on delay with respect to the supply air
fan on R2 controller, in order to avoid over-loading in electric supply at AHU start-up.
ModBus supervision is possible.
Frost protection:
in case of heated fluid lack or of faulty control, if the anti-frost thermostat (5)
detects a temperature lower than the set value, the controller stops the fan and closes the outside
air and air-exhaust dampers and contemporarily opens the return air damper.
Obstructed filter
: the pressure switch (7) signals, to R1 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 the supervision via LinkBus.
Possible Variants:
set-point of heating/cooling loops (output Ao1) compensated through outside
temperature sensor connected to SC input, or remote set-point from potentiometer.
It is possible to have a proportional humidifier connected to A02 output of R2 controller.
It is possible to have a remote set on post-heating drive.
It is possible to have thermal contact detection on unused R2 digital input, or possible alarm
signalling activation on R2 through unused relays.
For all variants, where the three analogue inputs are not available, there is the possibility of limit or
of compensation on the signal transmitted by another controller via LinkBus.
