Rev. d 01/1 35
DMP052E
SYSTEM APPLICATIONS
EXAMPLE 1:
OUTSIDE AIR PLANT WITH S/W TIME CONTROL OF ROOM TEMPERATURE AND ON/OFF
WINTER HUMIDIFICATION
Proportional temperature controller, heating/cooling changeable by D.i.2. with outside
compensation, and on/off humidity c limit control (anti-frost or max temperature) on any of
D.i.1 digital inputs. “Configurable” start-up of two relays on hysteresis or control.
OPERATION
The controller carries out time control, with PI action, on room temperature (A2 sensor) or on air
exhaust (2B sensor) by driving the valve (4) on heating/cooling coil.
It controls “direct” action (summer) or “reverse” action (winter) depending on changeover (6) as per
digital input D.i.2.
In winter time, room humidity (transmitter 3) is kept above or equal to the set point value through
on/off humidification (9). 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 damper.
Obstructed filter
: the pressure switch (7) signals the presence of obstructed filter if the differential
pressure before and after the filter, increases over the set value.
Possible variants
:
Remote set-point of heating/cooling coil on SC input or outside compensated set-point with sensor
on SC input. On the controller, only in summer mode, in the temperature control loop, can be
enabled the function “max humidity limit” on the proportional valve (4) according to the 0-100%
signal given by SH input (Humidity transmitter), to the set-point and humidity limit value set.
If the request of cooling due to limit loop (de-humidification) is higher than that one for temperature,
the controller will give priority to the request of de-humidification (the limit signal is predominant),
by cooling more in order to condensate more humidity on supply
It is possible to have a proportional humidifier where, instead of the Rel2 digital output connected
to on/off humidifier, the Ao2 analogue output is considered as connected to a proportional
humidifier.
