Kaisai Heat Pump KHA, KMK, KMC

Use cases

• Monitor water tank temperature and room temperature remotely to verify heating performance for your customer.
• Create an alert when a fault code appears so you can respond before the end user notices a problem.
• Track electricity consumption and power output over time to calculate the heat pump coefficient of performance.
• Switch the heat pump on or off remotely to support demand-side energy management or seasonal shutdown.
• Log compressor runtime to plan preventive maintenance intervals and reduce unexpected downtime.
• Compare operating data across multiple Kaisai installations in a single ModbusCloud dashboard.

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the Kaisai heat pump RS-485 terminals using a twisted pair cable with correct A/B polarity.
2. 2Set the Modbus slave address on the Kaisai heat pump via its built-in controller menu, and note the address for configuration in ModbusCloud.
3. 3Confirm the baud rate is set to 9600, 8 data bits, 1 stop bit, no parity on both the heat pump and the gateway.
4. 4Import the Kaisai KHA/KMK/KMC template from the ModbusCloud template library and assign it to the gateway.
5. 5Verify that live readings such as T4 temperature and operating mode appear on the ModbusCloud dashboard before closing the installation.

Things to watch for

01

Power output and electricity consumption show incorrect or zero values. What is wrong?

These registers (40146 and 40144) are uint32 values spanning two consecutive addresses. Make sure the template is correctly configured to read 32-bit values. If you have modified the template, verify that the register count is set to 2 for each of these data points.

02

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

Verify RS-485 wiring polarity (A to A, B to B). Confirm the baud rate is 9600 on both devices. Ensure the correct Modbus slave address is entered in the ModbusCloud gateway configuration.

03

Is the KHC model supported by this template?

Yes. The KHC variant shares the same Modbus register map as the KHA, KMK, and KMC models and is fully supported by this template.

04

Can I control the heat pump operating mode remotely without affecting local thermostat settings?

The template writes the operating mode register on the heat pump. Depending on the Kaisai controller configuration, a local thermostat override may take priority. Consult the Kaisai installation manual for details on Modbus vs. local control priority.

Registers (11)

9 read / 2 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