Nibe (KNV) Heating & Cooling (S-Series)

Use cases

• Monitor outdoor, supply, and return flow temperatures on a live cloud dashboard to verify heat pump performance remotely.
• Create an alert when the compressor exceeds a defined number of operating hours to schedule preventive maintenance.
• Track total thermal power and actual electrical power over time to calculate and report seasonal coefficient of performance.
• Switch heating and cooling modes remotely based on building occupancy or external scheduling logic.
• Adjust the HC1 offset curve remotely to optimize comfort without an on-site visit.
• Trigger hot water demand activation in coordination with PV surplus to maximize self-consumption.

Installation

1. 1Enable Modbus TCP on the Nibe S-Series heat pump via the HMI under menu 7.5.9 Modbus TCP/IP and note the assigned IP address.
2. 2Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the heat pump using an Ethernet cable.
3. 3In the ModbusCloud portal, import the Nibe (KNV) S-Series template and assign the heat pump IP address and default Modbus TCP port 502.
4. 4Optionally export the full register list from the heat pump HMI to a USB stick to verify register availability for your specific model.
5. 5Verify communication by checking that live temperature values and compressor status appear on the ModbusCloud dashboard.
6. 6Configure any desired control setpoints such as operating mode or supply flow target temperature and confirm correct write access.

Things to watch for

01

Why do I see zero or incorrect values for total thermal power or compressor starts?

These registers (e.g. addresses 1575, 1577, 1083) are 32-bit values spanning two consecutive Modbus registers. Ensure the template is configured to read them as 32-bit integers rather than single 16-bit registers.

02

Can I use this template for Nibe F-Series or Greenline models?

No. The register maps differ significantly between the F-Series, S-Series, and Greenline product families. Use the dedicated F-Series or Greenline template for those models.

03

How do I find the correct Modbus TCP port and IP address on the heat pump?

Navigate to menu 7.5.9 Modbus TCP/IP on the heat pump HMI display. The IP address and port (typically 502) are shown there. Make sure the gateway and heat pump are on the same subnet.

04

Do I need an external Modbus gateway module to connect the S-Series?

No. The Nibe S-Series and SMO S40 controller have a built-in Modbus TCP interface. You connect the ModbusCloud gateway directly over Ethernet without any additional hardware.

Registers (42)

40 read / 8 write

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