Rev. d 01/1 41
DMP052E
EXAMPLE 6
OUTSIDE PLANT WITH STATIC RECUPERATOR S/W TIME CONTROL FOR ROOM
TEMPERATURE AND PROPORTIONAL HUMIDIFICATION
Proportional temperature controller with heating/cooling sequence or S/W changeover, with outside
temperature compensation and proportional humidity control. Summer start-up of bypass damper
recuperator when the inside temperature condition is unfavourable.
OPERATION
The controller time controls, with PI action, the room temperature (sensor A2) or on air exhaust
(sensor 2B) by driving the valve (4) on the heating/cooling coil with outside compensated set-point
with sensor (10) on SC input. It is possible to control “Direct” (summer) or “Reverse” (winter)
function depending on S/W changeover (6), coming from digital input D.i.2 .
In winter mode, the room humidity (transmitter 3) is maintained at set-point through proportional
humidification by driving the valve (1). In summer time, when inside temperature exceeds the
outside one, the static recuperator is by-passed by driving the damper (9) to avoid the recovery of
exceeding heating or, vice versa, if the inside temperature is lower than the outside one.
Limit action (anti-frost or max temperature) on D.i.1 digital input.
Fan start-up with stroke end switch of inlet and air-exhaust dampers (8) in order to avoid cavitation
phenomena. The obstructed filter contact can be inserted in series with FA (5) contact to improve
protection.
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, to R2 controller, the presence of obstructed filter
if the differential pressure before and after the filter, increases over the set value.
Possible Variants:
In summer mode only, in the thermal control loop, it is enabled the function
max humidity limit on proportional valve (4) depending on the 0-100% signal coming from SH input
(humidity transmitter) and of the adjusted set and humidity limit proportional band. If the request of
cooling due to limit loop (de-humidification) is higher than the temperature one, the controller will
give priority to the request of de-humidification (the limit loop signal is prevailing), by cooling more
in order to condensate more humidity on supply.
Содержание W500H
Страница 30: ...Rev d 01 1 30 DMP052E MENU DIAGRAM...
