Room Ventilation Controller

Controls a single fan based on Humidity, Temperature and CO2. For Temperature functionality, the fan must be assigned to a Room Controller as a source. In addition, the System Variable "Outdoor Temperature" is also required.


Table of Contents


Inputs

Abbreviation Description Unit Value Range
Hi Internal Humidity. If humidity exceeds parameter Hmax, the ventilation will increase. If this input is not connected, humidity is not taken into account. % 0...100
CO2 Internal Air Pollution. If CO2 levels exceed the parameter CO2max, ventilation is increased. If this input not connected, air pollution is not taken into account. ppm 0...∞
Ts External Temperature. Indicates the temperature of incoming air. Used for Temperature and Frost Protection functionalities. If this input is not connected, the value of the System Variable "Outside Temperature" is used. If this is also not available, all Temperature Functionality is disabled. º
Iw Window Contact (ON = Window Open, OFF = Window Closed). If a window is open, Ventilation is disabled. Digital 0/1
Mv Motion Sensor Input. The overrun duration must be configured using parameter TH. Digital 0/1
St Digital Input - When ON stops any automatic control and sets all outputs to OFF Digital 0/1
SI Digital Input - Sleep Mode: Turns off ventilation for the time set in parameter TSl. Afterwards, the block will start again with ventilation. Digital 0/1
Tb Digital Input - BOOST: Stops all current control and sets the output to 100 percent Digital 0/1
Ex Digital Input - Exhaust Air: terminates all controls and vents with 100 percent ventilation Digital 0/1

Outputs

Abbreviation Description Unit Value Range
AQ Fan Speed. This output is used if you are not using a dedicated supply or exhaust fan. % 0...100
AQe Exhaust Air - For controlling a dedicated air exhaust fan. When the fan is operating in supply air mode, this output is 0. % 0...100
AQi Supply Air - For controlling a dedicated air supply fan. When the fan is in exhaust air mode, this output is set to 0. % 0...100
Q Heat Exchanger. Connect this output to a Heat Exchanger actuator. If there is no heat exchanger, do not connect the output. Digital 0/1
AQs Analogue Output - Value indicates which parameter is driving the ventilation. This output is for informational reasons only. 0: Basic Ventilation, 1: Increased Humidity, 2: Temperature Control, 3: Poor Air Quality (CO2), 4: Manually Stopped, 5: Window Open, 6: Manual Boost, 7: Manual Control User Interface, 8: Manual Exhaust Air, 9: Sleep Mode. - 0...9

Parameters

Abbreviation Summary Description Unit Value Range
Hmax Maximum Humidity Maximum Humidity Limit: The block tries to keep the Internal Humidity level below this value. % 0...100
CO2max Maximum Air Pollution Maximum Tolerable Air Pollution: The block will always try to keep the Internal Air Pollution level below this value. ppm 0...∞
TH Motion Sensor Overrun Overrun timer, which starts with the falling edge of the motion detector. Extends presence by the specified time span s 0...∞
TSl Sleep Mode Duration Overrun timer, which starts with the falling edge of the sleep input. Keeps the device off for a specified period of time. s 0...∞
Vi Intensive Ventilation During Absence Intense Ventilation During Absence. At Humidity levels above Hmax or CO2 levels above CO2max, the fan will operate at this strength. In Temperature mode, this value is used as the maximum. % 0...100
V Basic Ventilation During Absence Basic Ventilation During Absence. Fan operates at this level in automatic mode when absent. In Temperature mode, this value is used as the minimum. % 0...100
VPi Presence Intensive Ventilation Intensive Ventilation During Presence. At Humidity levels above Hmax or CO2 levels above CO2max, the fan will operate at this strength. In Temperature mode, this value is used as the maximum. % 0...100
VP Presence Basic Ventilation Intense Ventilation During Presence. Fan operates at this strength during automatic mode when present. In Temperature mode, this value is used as the minimum. % 0...100
TF Frost Protection Temperature Frost Protection Temperature: If the outside temperature is below this value ventilation will be stopped to prevent any damage. WARNING: If the System Variable "Outdoor Temperature" is not used, this safety setting is disabled! -

Preferences

Summary Description Unit Value Range
Energy Costs Costs for running this source. Sources that have been configured to be 'expensive' will only be requested by room controllers if no sources with higher priorities are available. - -
Exhaust Air / Supply Air Operation Permitted Sets whether a fan is permitted to operate as extract only. When active, an extra input is available on the Leaf function block which can be used to start the extract mode. WARNING: If a room has an open fireplace an extract fan in close proximity may result in smoke being pulled into the room! - -
Maximum Air Exchange Specify the maximum air exchange that the ventilation unit can provide for the current room. You will find this information on the data sheet for the device. This information is used for optimum adjustment of the controller. m³/h