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Installation and Operating Instructions
Central ventilation unit – KWL 500 W/W ET
• Extract air
The set supply air temperature changes depending on the extract air temperature (up to ±10 °C).
If the extract air temperature is lower than the set supply air value, the supply air temperature setpoint will be
increased (max. 10 °C).
If the extract air temperature is higher than the set supply air value, the supply air temperature setpoint will be
reduced (max. 10 °C).
Example: The target supply air temperature in the "At home" profile is 20 °C and the room temperature is 24 °C.
The supply air temperature setpoint will be adjusted to 16 °C.
• Extract air Plus
The set supply air temperature changes depending on the extract air temperature (up to ±10 °C). The ventilation
unit increases the power if there is the possibility to reduce the room temperature with the intake air.
The fan power is not increased if the current supply air temperature is higher than the current extract air tempe-
rature in the room.
Example: The target supply air temperature in the "At home" profile is 20 °C and the set fan power is 50 %. The
room air temperature is 24 °C. The Extract air Plus method adjusts the target supply air temperature to
16 °C and the unit runs with a fan power of 90 % (if Boost mode is higher than 90 %).
• Rel. humidity
• Automatic
The limit values are automatically determined using the recent humidity curve.
• Manual
The limit values for the relative humidity can be manually adjusted.
• CO2/VOC limit
8.6.3 Heat exchanger frost protection
Setting the boundary conditions for frost protection:
• Passivhaus
ⓘ Mandatory selection for Passivhaus.
• DiBt
8.6.4 Modbus settings
The following parameters can be adjusted:
• Address
• Baud rate
• Parity
• Stop bit
8.6.5 Input settings
View or edit input settings:
• Analogue input
• Not used
• Stop (0-1 V), Away from home (2-4 V), At home (5-7 V), Intensive ventilation (8-10 V)
• Digital input 1 / Digital input 2
• Not used
• Fireplace mode Off / On (0 V / 24 V)
• At home / Away from home (0 V / 24 V)
• Emergency off/Normal mode (0 V / 24 V)
• Intensive ventilation Off/On (0 V / 24 V)
• Normal mode / Bypass (0 V / 24 V)
• Weekly programme Off / On (0 V / 24 V)
• Configurable input Off / On (0 V / 24 V)
ⓘ The digital inputs can be adjusted using the pen
8.6.6 Relay settings
Set and edit the relay function:
• Maintenance display
Filter replacement is displayed (relay status: closed)
• Error message
Error message is displayed (relay status: closed). The error is also recorded on the error log.
• Error message or maintenance display
Filter replacement or error message is displayed (relay status: closed)
• Emergency off
Emergency off function is activated (relay status: closed). The emergency off function is normally activated by an
external signal via the digital input.
• Position bypass shutter
Bypass shutter position is displayed.
– Relay open:
Bypass is activated. The air flow is directed past the heat exchanger.
– Relay closed:
Bypass is deactivated. The air flow does through the heat exchanger.
• Control EWT (not available yet)
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