NORDline WWBA

Use cases

• Monitor outlet water and DHW tank temperatures on a live cloud dashboard for remote customer support.
• Switch between cooling, heating, and FCU heating modes remotely without a site visit.
• Create an alert when any of the five error codes becomes active to reduce response time.
• Adjust floor heating outlet temperature setpoints based on outdoor conditions or customer requests.
• Track compressor run status and discharge gas temperature to schedule preventive maintenance.
• Log evaporator coil temperature over time to detect early signs of refrigerant issues.

Installation

1. 1Wire the ModbusCloud gateway (MCG or MLP series) to the NORDline WWBA RS-485 terminals, observing correct A and B polarity.
2. 2Terminate the RS-485 bus with a 120 ohm resistor at both ends if the gateway is the last device on the bus.
3. 3On the NORDline WWBA controller, set a unique Modbus slave address and confirm the baud rate is 9600, 8N1.
4. 4In the ModbusCloud portal, import the NORDline WWBA template and enter the matching slave address.
5. 5Verify communication by checking that output temperature and compressor status values appear on the dashboard.
6. 6Configure alerts or automations for error codes and temperature thresholds as needed.

Things to watch for

01

The gateway cannot communicate with the heat pump. What should I check first?

Verify that the RS-485 A and B wires are not swapped. Also confirm the baud rate on the heat pump is set to 9600 with 8 data bits, no parity, and 1 stop bit (8N1). Check that the slave address in ModbusCloud matches the address configured on the unit.

02

Can I use one template for different WWBA models?

Yes. The WWBA9.5 H-B/P, WWBA13.5 H-B-S, and WWBA19.5 H-B-S share the same Modbus register map. A single template instance works for any of these models.

03

Do I need a bus termination resistor?

If the ModbusCloud gateway is at one end of the RS-485 bus, place a 120 ohm termination resistor across the A and B lines. The heat pump end should also be terminated if it is the other physical end of the bus.

04

Temperature values look incorrect or scaled wrong. How do I fix this?

The template already includes the correct scaling factors for all temperature registers. If values still appear wrong, confirm you have imported the latest version of the NORDline WWBA template from the ModbusCloud library.

Registers (17)

16 read / 4 write

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