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CH1 2 / 4 Pipe FCU Thermostat +CO2 RelayModel Number: MC6-FCU+ CO2 Relay Power supply: 24VAC / 95-260vac, 50/60hz Fan Coil Unit Thermostat 2 / 4 pipes HVAC system 3 speed Fan On/Off Valve Communicate: Modbus TCP /RTU C/F Temperature Display Set Temp. Range: 5~45℃ (software selectable) Schdule: 5+2 Day, 7 Day And 24 Hour(Max 6 Timers) Temperature Calibration 
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Product Description
The CH1 could detect CO2 value and show it on the home screen. If the CO2 icon color is green it means current CO2 value is safe. If CO2 color is yellow it mean the CO2 is a little high in the room; if CO2 color is red, it means the CO2 is high, you need to start vandalize fan to make more fresh air comes in. User could set the CO2 setpoint, press this icon to enter the CO2 settings screen, you can set the Fan starts CO2 value, there will be a +- 50ppm around the setpoint ,in this area the fan dose not work , if co2 value higher this range(setpoint + 50ppm) the fan will start till the value lower the Low point(setpoint – 50ppm) , please check below diagram.
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