Tuya Ventilation Controller

Fresh Air System Controller Instruction

KF-900A

Description

The 900A Ventilation System intelligent controller features touch-button technology for flexible operation. The built-in NDIR sensor of the controller can monitor the indoor temperature, humidity and CO2 concentration in real time, and the controller output signal directly controls the start and rotation speed of the fresh air device. It is used in residential, commercial and industrial applications and it is effective in improving air quality.

Create a healthy, comfortable, efficient, environmentally friendly, energy-saving living and working environment.

Features

Operating mode: Auto, Manual, Programming

Wind speed : High, Med, Low and Auto speed

Programming setting different wind speeds

Time display

Manual bypass valve control

RS485 communication (optional)

Humidity display

Temperature display

LCD Display

1. ON/OFF Controller: Press  button to power ON / OFF. All Outputs and LCD will be closed in OFF state.

2.Switch the working mode: Press  button to switch working mode. ＂Auto mode-→Manual-→Programming-→Auto mode＂

3.Manual Mode: Manual Set the speed of Fan ( HIGH, MED, LOW or OFF) by button, and the Fan will run according to the setting. In this model, controller will not affected by CO2 concentration and timing.    

4.Programming mode: Controlller will be run according to the set time & speed(7 days, 4 time periods each day).

5.Auto mode setting Concentration: In Auto mode, Long press  button for 2 second, and then enter CO2 concentration value setting interface.It will appear CO2 concentration setting value and flash. Then Press  and  to adjust value(350-1000ppm) In Auto mode, Long press  button for 2 second, and then enter PM2.5 concentration value setting interface.It will appear PM2.5 concentration setting value and flash. Then Press  and  to adjust value. Controller will be return to normal working mode and save setting Parameter automatically If there is no any operation for the buttons for 10 seconds during the setting process.

6.Auto mode:Controller will be adjusted speed by auto according to the air quality（pm2.5 and CO₂ concentration)

PM2.5 concentration >70ug/m(setting Value) or CO₂ concentration>500ppm(setting Value),Fan is in HIGH Speed State.

PM2.5 concentration >35－69ug/m³(setting Value range) or CO₂ concentration>200-499ppm(setting Value range),Fan is in MED Speed State.

PM2.5 concentration >0－34ug/m³(setting Value range) or CO₂ concentration>0-199ppm(setting Value range),Fan is in LOW Speed State.

PM2.5 concentration< setting value or CO₂ concentration < setting value. Fan Stop working.

7.Programming Setting: Long press  button for 2 second and then enter setting parameter interface. Firstly, local time calibration. Press  button to change Week / Hour / Minute,and the corresponding parameter will flash.Press  and  button to adjust the value. After finsh Local time calibration, go on press  button enter first period hour setting on Monday, press  button change to Hour, Minute,Fan Speed and press  and  button adjust value. After done first period, press  button enter second period hour setting on Monday...Repeat above steps to set all 28 time periods.Controller will be return to normal working mode and save setting Parameter automatically If there is no any operation for the buttons for 10 seconds during the setting process.

Parameter 

Power supply: 200～240VAC,50Hz-60Hz

CO2 display range: 400ppm-1999ppm

CO2 adjustment range: 350-1000PPM

CO2 control range: 350～1500PPM

CO2 measurement maximum: 1999PPM

pm2.5 display range (option) : 1ug/m3-999ug/m3

Temp. display range: 0~50℃

Working Temp.: -10-50℃

Humidity range: 5～99%RH

Control power: ≤200W

Rated Power: < 2W

Pre-heat: 1 minute

output interface: 0-10V

Dimensions(W × H × D): 86×86×50MM

Wiring: 2 x 1.5 or 1 x 2.5MM2

Install hole spacing: 60mm

Protection Class: 30IP

Flame retardant rating: V0

Wiring Diagram  

Terminal 1: Neutral

Terminal 2: Line

Terminal 3: High Speed Output

Terminal 4: Med Speed Output

Terminal 5: Low Speed Output

Terminal 6: Valve OFF

Terminal 7: Valve ON

Terminal 8 ,9: RS 485 ,Modbus RTU