Base Station Free Cooling Unit Energy Saving Controll System

1: energy saving 2: 48VDC input, auto control, 3: termal speed adjustment 4: fan and air conditioner link control

System monitor:

Type	Remark
Analog input	Outdoor temperature
	Indoor temperature and humidity
Digital input	1# AirCon conditioner switch state
	2# AirCon conditioner switch state
	FCU fan switch state
	Mains state
	Power supply low voltage
	Differential pressure gauge state  ( optional )
	Smoke alarm ( optional )
	Other reserved
Digital output	1# AirCon switch  2# AirCon switch
	FCU fan switch
	Reset control for smoke sensor (optional)
	Other reserved
Data communication interface for supervision	RS232 port for computer connection ( optional) 8 dry contactors  (optional)
Display	LCD local display
Keyboard	4 buttons available
Temperature speed control	0-100% speed control according to room temperature change
Data storage	1 month indoor temperature and outdoor temperature storing each 20 minutes ( optional)

 Note: Data storage function is being developed.

Logic 

When outdoor temperature is lower than the setting of CCU, FCU fan is started and indoor temperature will be controlled by FCU.  Air conditioner will be started instantly to control indoor temperature as FCU is unable to control indoor temperature.  When CCU detects fault of air conditioner, i.e. outdoor temperature is below indoor temperature, FCU fan will be started.When indoor smoke alarm is detected by CCU, the FCU fan and air conditioner will be stopped until the alarm is eliminated.  Controller will generate alarm at 40 degree if AC is faulty. Fan operation option is based on temperature as well as variable time dependent.FCU system has auto and manual option function.All alarms will be display on LCD. Users can check all alarms easily.When differential pressure gauge alarm output reaches up to a certain accumulated time, the CCU will stop FCU fan until the filter is replaced and alarm is cleared.When individual excess short operation time of single FCU fan happens, CCU will automatically lower down the settings of outdoor temperature to start up FCU fan so as to prevent frequent switching between FCU and air conditioning system.When indoor temperature goes down to lower level, both air conditioner and FCU fan will stop.

Software functions:  

Fans stop and air conditioners start in the system when temperature – humidity sensor fails.  Fault detection of air fan and air conditioner  An automatic adjustment of key – parameters based on efficiency in brought in fresh air.  An alarm to replace the filters is given by a signal from differential gauge or a period of operation timeOperation time accumulation of fan and air conditioner  Operation mode selection of Manual / Automation.History alarm information storage and indoor and outdoor temperature storage.Operator password management.  EC fan speed control by temperature. 

        

Base Station Free Cooling Unit Energy Saving Controll System