Wolf CWL Excellent

Use cases

• Monitor outside and dwelling temperatures alongside supply and exhaust airflow on a live cloud dashboard.
• Create an alert when the filter status indicates a clogged filter so you can schedule maintenance proactively.
• Adjust target flowrate remotely to match seasonal occupancy changes in residential buildings.
• Track CO2 sensor values over time to verify that ventilation rates meet indoor air quality standards.
• Configure bypass valve mode and geo heat exchanger settings remotely after commissioning without a site visit.
• Trigger a filter reset from the cloud dashboard after a filter replacement has been completed on site.

Installation

1. 1Install the Wolf Modbus interface module in the CWL Excellent unit and connect it to the RS-485 port on your ModbusCloud gateway (MCG or MLP series) using twisted pair wiring with correct A/B polarity.
2. 2Set the Modbus slave address on the Wolf unit to a unique value on the bus, and note this address for configuration in ModbusCloud.
3. 3Configure the serial port on the ModbusCloud gateway to 9600 baud, 8 data bits, odd parity, and 1 stop bit to match the Wolf CWL Excellent settings.
4. 4Import the Wolf CWL Excellent template from the ModbusCloud template library and assign the correct slave address.
5. 5Verify communication by checking that live values such as outside temperature and supply flowrate appear on the ModbusCloud dashboard.
6. 6Remember that register addresses are offset by 1 from Wolf label numbers, so label 4011 maps to address 4010 in the template.

Things to watch for

01

I see no data after connecting the gateway. What should I check?

Verify that the RS-485 A and B lines are not swapped and that the baud rate is set to 9600 with odd parity on both the gateway and the Wolf unit. Also confirm the correct Modbus slave address is configured in the template.

02

Why do temperature readings appear as very large or negative numbers?

Temperature registers on the Wolf CWL Excellent are signed int16 values. Make sure your gateway and template interpret these registers as signed integers, not unsigned. The template is preconfigured for this, but manual edits may have changed the data type.

03

How do I know which register address to use if I want to add custom registers?

Wolf documentation uses label numbers that are offset by 1 from the actual Modbus addresses. Subtract 1 from the label number to get the correct register address. For example, label 4011 corresponds to address 4010.

04

Does the Wolf CWL Excellent support Modbus RTU out of the box?

No, you need the optional Wolf Modbus interface module installed in the unit. Without this module, the RS-485 connection is not available.

Registers (34)

22 read / 12 write

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