人妻系列无码专区69影院
Location:Home > Products > DDC building automation system > DDC control system for air handling units
classification:

DDC control system for air handling units

System uses the DDC control to control the air conditioning unit, consisting of air valve, filter, cooler, heater,heating coil fan. The components of the control system is composed of air temperature and humidity transmitter, return air temperature transmission, air temperature and humidity transmitter, antifreeze switch,pressure switch, air valve actuator, electric control valve.

DDC control system for air handling units

 

 

 

Composition:

System uses the DDC control to control the air conditioning unit, consisting of air valve, filter, cooler, heater,heating coil fan. The components of the control system is composed of air temperature and humidity transmitter, return air temperature transmission, air temperature and humidity transmitter, antifreeze switch,pressure switch, air valve actuator, electric control valve.

Monitor and control function:

The electric air valve, electric control valve and the blower fan interlock, when activated, fresh air valve to open(0-100% can be set), return air valve opening (can be set to 0-100%) according to the PID electric control valveregulating opening; fan stops, electric, air valve, electric control at the same time, close the valve.

But when the filter is blocked, the pressure switch filter blocking alarm signal is given.

The winter when the coil temperature is too low, low temperature freezing switch gives a switch signal, the fanstops running, the air valve is closed, the electric control valve to open, in order to prevent the coil. When thefrost preventive switch back to normal, re start the fan, open the air valve, the unit back to work.

Temperature control air conditioning unit according to the deviation of the most return air temperature and airtemperature, the opening degree of PID by regulating water road, electric control valve, so that the measuredtemperature reaches the set temperature value.

Humidity control air conditioning unit according to the air humidity and air humidity test set error, opening byPID regulating steam electric valve, so that the measured temperature reaches the set temperature value.

The fan monitoring and control for the monitoring of fan operation status, fault and hand / automatic control ofair blower, the start and stop.

This figure of the humidification for dry steam humidizer selection, so the amount of steam electric valve andcontrol humidity, such as water wet, do not use electric regulating valve control device, but directly control humidifier, generally for monitoring the state of the start stop control.