Installation check listConguration
System Design ApplicationsIntroduction
• Installing DHW temperature sensor
Length of DHW temperature sensor: 10 m (Provided as default)
Connect DHW temperature sensor to PCB CN-TH4 and insert sensor in the temperature sensor pocket 
in tank.
• Installer setting
For DHW operation 
Select on installer setup whether to use booster heater alone or both backup heater and booster 
heater.
Press ‘up’ for 3 sec
• System diagram
DHW tank
DHW 
Temp.  sensor
IDU
Purpose:  Conguration for DHW exclusive operation. Control separately the heater installed the tank 
where DHW operation load is great or uctuation of conditions is drastic. 
Booster heater must be installed if DHW operation requires sterilization.
• Necessary conguration and feature
Dip s/w Separate setup is required Dip s/w No. 3: On
Remote controller
Use the default one attached to indoor 
unit
No installation required
Leaving water temperature Set up by remote controller Single temperature
control Control of DHW temperature sensor
DHW temperature can be set after 
initiating heating operation
DHW temperature sensor 
Installation
Temperature sensor that came with DHW 
tank needs to be installed.
Booster heater If applied, and tank kit is not used
Separate option
• Dip s/w Setting
OFF 
ON 
1  23 45678
Enter installer setup mode, then
Complete Heater priority conguration.
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COMPREHENSIVE APPLICATION AND INSTALLATION MANUAL
LG Electronics
4. System 4