Dimplex Heat Pump

Use cases

• Adjust heat curve HC1 from a ModbusCloud automation during a cold snap without sending a technician to the installation.
• Track compressor runtime across the year to plan service intervals before wear becomes a problem.
• Monitor status and error codes centrally across multiple Dimplex installs for remote troubleshooting.
• Shift warm water heating into the cheapest tariff window using a scheduled write to the hot water setpoint.
• Compare heat quantity across three circuits to verify hydronic balancing after commissioning.

Installation

1. 1Wire the Dimplex controller Modbus terminals to the ModbusCloud gateway RS485 channel. Check the Dimplex installation manual for the specific terminal numbers for your model.
2. 2Set Modbus address 1, 9600 baud, no parity, 1 stop bit in the Dimplex service menu (technician PIN required).
3. 3In ModbusCloud, add a Modbus RTU device matching those settings and import the Dimplex Heat Pump template.
4. 4Verify outdoor temperature reads a plausible value before trusting other registers.

Things to watch for

01

Why is the outdoor temperature register int16 and not uint16?

So it can report negative values. In winter an air-source heat pump outdoor sensor routinely sees temperatures well below zero. Using uint16 would produce garbage numbers below the freezing point.

02

Writing to Operating Mode seems to be ignored when the customer has locked the controller. What to do?

The Dimplex controller has a customer lock that overrides Modbus writes. Ask the customer to release the lock from the front panel, or have the heating engineer do it during commissioning.

Registers (23)

23 read / 3 write

More RTU templates

Alnor HRU-P

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls Alnor HRU-P heat recovery ventilation units via Modbus RTU.

49 registers7

Alnor HRU

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls and monitors Alnor heat recovery ventilation units via Modbus RTU.

29 registers13

Wattsonic - Schmachtl Sun Energy Box

Wattsonic

Modbus RTU

Monitors Schmachtl Wattsonic hybrid inverter via Modbus RTU

92 registers72

Heidelberg Wallbox Energy Control

AMPERFIED GmbH

Modbus RTU

Controls and monitors Heidelberg Wallbox Energy Control EV charger via Modbus RTU.

22 registers67

connecdoor.controller

connecdoor

Modbus RTU

Controls and monitors smart door access points via RS485

0 registers53

Belimo Air-Water Actuator Modbus RTU

Belimo

Modbus RTU

Controls communicative damper and valve actuators via Modbus RTU.

20 registers46