Airflow Wolf CWL-2-325
Controls and monitors a Wolf CWL-2-325 ventilation unit via Modbus RTU
This template provides full monitoring and control of the Wolf CWL-2-325 ventilation unit via Modbus RTU. It reads supply and exhaust air temperatures, pressures, flow rates, bypass status, and filter status. It also allows control of throughput settings, bypass mode, imbalance offsets, and device resets.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 19, read and write
- Brand
- Wolf
- Key readings
- Supply & exhaust air temperature · Supply & exhaust air pressure · Supply & exhaust air flow rate · Bypass status · Filter status
- Available commands
- Desired throughput setting · Bypass mode · Imbalance offset supply/exhaust · Reset filter warning / device
- Compatible models
- Wolf CWL-2-325
- Last updated
Registers (19)
10 read, 9 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| exhaust air temperature | °C | Read | |||
| actual pressure supply air | Pa | Read | |||
| actual pressure exhaust air | Pa | Read | |||
| setpoint supply air | m³/h | Read | |||
| actual value in air | m³/h | Read | |||
| exhaust air flow rate setpoint | m³/h | Read | |||
| actual value throughput exhaust air | m³/h | Read | |||
| temperature supply air | °C | Read | |||
| Bypass-Status | Read | ||||
| filter status | Read | ||||
| Imbalance allowed | Write | ||||
| Offset imbalance supply air | Write | ||||
| Offset imbalance exaust air | Write | ||||
| Bypass mode | Write | ||||
| Desired throughput setting | Write | ||||
| change of switch position | Write | ||||
| Desired throughput setting | Write | ||||
| Reset filter warning | Write | ||||
| Reset the device | Write |
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Use cases
- Monitor supply and exhaust air temperatures on a live dashboard to verify heat recovery performance.
- Create an alert when the filter status indicates a clogged filter so maintenance can be scheduled proactively.
- Adjust the desired throughput setting remotely to match seasonal ventilation requirements.
- Track supply and exhaust air pressure trends to detect ductwork issues or fan degradation over time.
- Reset a filter warning remotely after a maintenance visit without accessing the unit directly.
- Verify bypass status during summer operation to confirm free cooling is active.
Installation
Connect the ModbusCloud Gateway to the RS-485 terminal of the Wolf CWL-2-325 using a twisted-pair cable with correct A/B polarity.
Set the Modbus RTU baud rate on the Wolf CWL-2-325 to 9600, matching the gateway configuration.
Assign a unique Modbus slave address on the Wolf unit and configure the same address in the ModbusCloud gateway.
Import the Wolf CWL-2-325 template from the ModbusCloud template library into your project.
Verify communication by checking that supply and exhaust air temperature values appear on the dashboard.
Confirm which write register (address 8000 or 8002) controls supply air throughput and which controls exhaust air throughput during commissioning.
Things to watch for
Why do I see two registers both labeled 'Desired throughput setting'?
The Wolf CWL-2-325 uses register address 8000 and 8002 for throughput control. One applies to supply air and the other to exhaust air. Write a test value to each register individually and observe which airflow changes on the unit to determine the correct mapping.
What baud rate should I use for the Modbus RTU connection?
The default baud rate is 9600. Make sure both the Wolf unit and the ModbusCloud gateway are set to the same baud rate, parity, and stop bit configuration.
The filter status register does not update after I replaced the filter. What should I do?
After physically replacing the filter, use the reset filter warning register in the template to clear the warning. The Wolf unit will not automatically reset this status upon filter replacement.
I am not getting any response from the Wolf unit over Modbus RTU. What should I check?
Verify the RS-485 wiring polarity (A and B terminals), confirm the correct slave address is set on both the unit and the gateway, and ensure the baud rate matches. Also check that the RS-485 bus is properly terminated if the cable run is long.
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