AlexeyVdovin / esp8266_lgawhp

Bridge for 2018+ R32 LG Air/Water-Heat pumps

esp8266_lgawhp - MQTT bridge for LG AWHP

Bridge for 2018+ R32 LG Air/Water-Heat pumps. See https://www.lg.com/de/business/monobloc for more information on the unit.

About

Based on the results from https://github.com/hww3/LG_Aircon_MQTT_interface

Hardware

esp8266_lgawhp

Same as https://github.com/hww3/LG_Aircon_MQTT_interface

PENKTH000 emulator

Usage

Outlook

1. Simulate PENKTH000 to leverage power usage control
2. Complete documentation / usage

LG AWHP Protocol

Glossary

Abbrev	Meaning
AWHP	Air/Water heat pump
ODU	Outdoor unit
IDU	Indor unit (monobloc includes this in the ODU), not to be confused with the REMO
REMO	Remote for control

General

• Single-wire half-duplex 300 Baud serial bus on the "Signal" line between ODU and REMO
• Packets are 20 Bytes in size
• Each (non-changing) packet is transmitted twice
• Each packet has a checksum in the last byte

Packet

Status update / command

00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19
x0	22	02	08	00	19	00	00	14	2D	00	17	11	26	C0	00	06	40	00	2F
SRC	MODE1	MODE2	MODE3	MODE4	UNK	UNK	UNK	Water_target	DHW_target	UNK	Water_In	Water_Out	DHW	UNK	UNK	UNK	UNK	UNK	ChSum

Energy monitoring

00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19
C6	00	00	00	00	00	00	00	00	00	0B	B8	00	00	00	00	D0	07	00	35
SRC	UNK	UNK	UNK	UNK	UNK	UNK	UNK	UNK	UNK	Unit limit	Unit limit	UNK	UNK	UNK	UNK	30010	30010	UNK	ChSum

Unknown

00	01
x5
x6	01
x6	02
x6	03

LG PENKTH000 Modbus

General

• Connection without GND with Modbus wires A and B
• Serial parameters: 9600 baud, 8 bits of data, No parity, 2 Stopp bits (9600 8N2)
• Protocol is standard Modbus RTU

Tools / References

• https://npulse.net/en/online-modbus
• https://www.modbustools.com/modbus_slave.html
• https://www.mikrocontroller.net/topic/500056
• https://www.scadacore.com/tools/programming-calculators/online-hex-converter/

Registers

Register	Type / length	Content	Unit
30010	uint8 / 1	energy consumption	W
40000	uint32 / 2	impulses per kWh, Connection 1	imp/kWh
40002	uint32 / 2	impulses per kWh, Connection 2	imp/kWh
40004	uint32 / 2	impulses per kWh, Connection 3	imp/kWh
40006	uint32 / 2	impulses per kWh, Connection 4	imp/kWh