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Installation and Operating Instructions
NOTE
NOTE
Central ventilation unit – KWL 890 W/W ET
• RH limit
• CO2/VOC limit
8.6.3 Heat exchanger frost protection
When using the „Bypass" frost protection method, the auxiliary heaters must be installed and electric auxiliary
heating must be activated under the heating setting (see chapter 8.6.8).
Setting the boundary conditions for frost protection:
• Fan stop
• Bypass
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
• Individual Off (0 V) / On (24 V)
• At home (0 V) / Away from home (24 V)
• Emergency off (0 V) /Normal mode (24 V)
• Intensive ventilation Off (0 V) /On (24 V)
• Normal mode (0 V) / Bypass (24 V)
• Weekly programme Off (0 V) / On (24 V)
• Configurable input Off (0 V) / On (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.
• Not used
The ventilation unit relay control is not used.
• Operating notification
Ventilation unit is in operation (relay status: closed).
8.6.7 Configuration
The corresponding basic configuration settings are assigned to the unit via the configuration number.
ⓘ The configuration number must only be adjusted when replacing the circuit board (e.g. defect). The configura-
tion number is located on the type plate.
8.6.8 Heating settings
The auxiliary heater and the heating type must be set to "Electric resistor".
Define settings for auxiliary heating:
• Bypass post-heater
• Electric resistor
• Not in use
• Post-heater
• Electric resistor
• Not in use
• Extension module
• No
• Yes
.
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