LG Hydro Kit IWT User manual

Please read this manual carefully before operating
your set and retain it for future reference.
OWNER’S MANUAL
AIR-TO-WATER
HEAT PUMP
ENGLISH ITALIANO ESPAÑOL FRANÇAIS DEUTSCH
ΕΛΛΗΝΙΚΆ
ČEŠTINA
NEDERLANDS
POLSKI
LIMBA ROMÂNĂ
www.lg.com
MFL72102301
Rev.00_122823
Copyright © 2024 LG Electronics Inc. All Rights Reserved.
Original instruction
Hydro Kit IWT (medium temperature)

2
TABLE OF CONTENTS
ENGLISH
4SAFETY INSTRUCTIONS
12 PRODUCT INTRODUCTION
12 Typical installation scene
13 Remote controller
13 Related Information
14 DESCRIPTION OF THE OPERATION
14 Main screen
14 Menu screen
15 Setting screen
15 Popup screen
16 Monitoring
16 Returning to the screen
17 OPERATION SETTING
17 On / Off
17 Operation mode
18 Cooling operation
19 Heating operation
20 AI / Auto operation
21 TEMPERATURE SETTING
21 Controlling desired temperature
22 Select Temperature Sensor
23 DHW heating operation
23 Quick DHW tank heating
24 View temperature
25 2 circuit mode
26 LOCK SETTING
26 How to enter Lock setting
26 Lock setting – all, on/off, mode, DHW lock
27 TIMER SETTING
27 Timer entrance and setting method
28 Simple Timer
29 Turn-On Reservation
30 Turn-Off Reservation
31 SCHEDULE SETTING
31 How to enter schedule
32 Daily schedule
33 Schedules & Edit
34 Schedules & Edit – Add schedule
35 Exception Day
36 DHW Recirculation Schedule
TABLE OF CONTENTS
nd

TABLE OF CONTENTS
3
ENGLISH
38 ENERGY MONITORING SETTING
38 Energy Monitoring Setting
39 Information of Energy Monitoring
40 FUNCTION SETTING
40 How to enter function setting
41 Function setting
42 Low Noise Mode Time
43 Wi-Fi Pairing
44 Water Temperature Setting
45 3rd Party Boiler
46 USER SETTING
46 How to enter user setting
46 User Setting
47 Language
48 Temperature Unit
49 Screen Saver Timer
49 LCD Brightness In Idle
50 Date
51 Time
52 Summer Time
53 Password
54 Schedule Reset
55 Theme
55 Auto return to main screen
56 System Reboot
57 OVERVIEW OWNER’S SETTINGS
57 Menu structure
59 USING THERMOSTAT
59 How to use thermostat
60 EMERGENCY OPERATION
62 Decommissioning and Recycling
64 Reset of the thermal protection of the electrical heater
65 MAINTENANCE AND SERVICE
65 Maintenance activities
65 When the unit is not going....
65 Call the service immediately in the following situations
66 Open Source Software Notice Information
66 Open source license

4
SAFETY INSTRUCTIONS
ENGLISH
WARNING
• Always ground the product.
- There is a risk of electric shock.
• Do not use a defective or underrated circuit breaker. Use the
correctly rated breaker and fuse.
- There is risk of fire or electric shock.
• Do not use a multi outlet. Always use this appliance on a
dedicated circuit and breaker.
- There is risk of fire or electric shock.
!
Read the precautions in this manual
carefully before operating the unit.
This appliance is filled with
flammable refrigerant.
This symbol indicates that the
Operation Manual should be read
carefully.
This symbol indicates that a service
personnel should be handling this
equipment with reference to the
Installation Manual.
WARNING
This indicates that the failure to follow the instructions can cause
serious injury or death.
CAUTION
This indicates that the failure to follow the instructions can cause
the minor injury or damage to the product.
This symbol is displayed to indicate matters and operations
that can cause risk.
Read the part with this symbol carefully and follow the
instructions in order to avoid risk.
!
!
!
The following safety guidelines are intended to prevent
unforeseen risks or damage from unsafe or incorrect operation
of the appliance.
The guidelines are separated into ‘WARNING’ and ‘CAUTION’ as
described below.
SAFETY INSTRUCTIONS

5
SAFETY INSTRUCTIONS
ENGLISH
• For electrical work, contact the dealer, seller, a qualified
electrician, or an Authorized Service Center. Do not disassemble
or repair the product by yourself.
- There is risk of fire or electric shock.
• Always ground the product as per the wiring diagram. Do not
connect the ground wire to gas or water pipes lightning rod or
telephone ground wire.
- There is risk of fire or electric shock.
• Install the panel and the cover of control box securely.
- There is risk of fire or electric shock due to dust, water etc.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Do not modify or extend the power cable. If the power cable or
cord has scratches or skin peeled off or deteriorated then it must
be replaced.
- There is risk of fire or electric shock.
• For installation, removal or reinstall , always contact the dealer or
an Authorized Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install the product on a defective installation stand. Be sure
that the installation area does not deteriorate with age.
- It may cause product to fall.
• Never install the unit on a moving base or a place from where it
can fall down.
- The falling unit can cause damage or injury or even death of a
person.
• When the product is soaked (flooded or submerged) in water,
contact an Authorized Service Center for repair before using it
again.
- There is risk of fire or electric shock.
• Be sure to check the refrigerant to be used. Please read the label
on the product.
- Incorrect refrigerant can prevent the normal operation of the unit.
• Don't use a power cord, a plug or a loose socket which is
damaged.
- Otherwise it may cause a fire or electrical shock.
• Do not touch , operate, or repair the product with wet hands.
- There is risk of electric shock or fire.

SAFETY INSTRUCTIONS
6
ENGLISH
• Do not place a heater or other heating appliances near the power
cable.
- There is risk of fire and electric shock.
• Do not allow water to run into electric parts. Install the unit away
from water sources.
- There is risk of fire, failure of the product, or electric shock.
• Do not store or use or even allow flammable gas or combustibles
near the product.
- There is risk of fire.
• Wiring connections must be secured tightly and the cable should
be routed properly so that there is no force pulling the cable from
the connection terminals.
- Improper or loose connections can cause heat generation or fire.
• Safely dispose off the packing materials. Like screws, nails,
batteries, broken things etc after installation or service and then
tear away and throw away the plastic packaging bags.
- Children may play with them and cause injury.
• Make sure to check that the power device is not dirty, loose or
broken and then turn on the power.
- Dirty, loose or broken power device can cause electric shock or
fire.
• In unit the step-up capacitor supplies high voltage electricity to the
electrical components. Be sure to discharge the capacitor
completely before conducting the repair work.
- An charged capacitor can cause electrical shock.
• When installing the unit, use the installation kit provided with the
product.
- Otherwise the unit may fall and cause severe injury.
• Be sure to use only those parts which are listed in the service
parts list. Never attempt to modify the equipment.
- The use of inappropriate parts can cause an electrical shock,
excessive heat generation or fire.
• Do not use the product in a tightly closed space for a long time.
Perform ventilation regularly.
- Oxygen deficiency could occur and hence harm your health.
• Do not open the front cover or grille of the product during
operation.
(Do not touch the electrostatic filter, if the unit is so equipped.)
- There is risk of physical injury, electric shock, or product failure.

7
SAFETY INSTRUCTIONS
ENGLISH
• If strange sounds, smell or smoke comes from product,
immediately turn the breaker off or disconnect the power supply
cable.
- There is risk of electric shock or fire.
• Ventilate the product room from time to time when operating it
together with a stove, or heating element etc.
- Oxygen deficiency can occur and hence harm your health.
• Turn the main power off when cleaning or repairing the product.
- There is risk of electric shock.
• Take care to ensure that nobody especially kids could step on or
fall onto the unit.
- This could result in personal injury and product damage.
• Take care to ensure that power cable could not be pulled out or
damaged during operation.
- There is risk of fire or electric shock.
• Do not touch any electric part with wet hands. you should be cut
power before touching electric part.
- There is risk of electric shock or fire.
• Do not touch refrigerant pipe and water pipe or any internal parts
while the unit is operating or immediately after operation.
- There is risk of burns or frostbite, personal injury.
• If you touch the pipe or internal parts, you should be wear
protection or wait time to return to normal temperature.
- Otherwise , it may cause burns or frostbite, personal injury.
• Do not touch leaked refrigerant directly.
- There is risk of frostbite.
• Make sure to install mixing valve (field supply). The mixing valve is
setting the water temperature. The hot water temperature
maximum values shall be selected according to the applicable
legislation.
• Do not heated to a temperature of more than provided by the
product.
- Otherwise, it may cause fire or damage of product.
• This appliance is intended to be used by expert or trained users in
shops, in light industry and on farms, or for commercial use by lay
persons.
• Do not step on the unit and do not put anything on it.
It may cause an injury through dropping of the unit or falling down.

8
SAFETY INSTRUCTIONS
ENGLISH
• Use a vacuum pump or Inert (nitrogen) gas when doing leakage
test or air purge. Do not compress air or Oxygen and Do not use
Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
• The appliance shall be stored in a well-ventilated area where the
room size corresponds to the room area as specified for operation.
• The appliance shall be stored in a room without continuously
operating open flames (for example an operating gas appliance)
and ignition sources (for example an operating electric heater).
• The appliance shall be stored so as to prevent mechanical damage
from occurring.
• Any person who is involved with working on or breaking into a
refrigerant circuit should hold a current valid certificate from an
industry-accredited assessment authority, which authorises their
competence to handle refrigerants safely in accordance with an
industry recognised assessment specification.
• Keep any required ventilation openings clear of obstruction.
• Servicing shall only be performed as recommended by the
equipment manufacturer. Maintenance and repair requiring the
assistance of other skilled personnel shall be carried out under the
supervision of the person competent in the use of flammable
refrigerants.
• The appliance shall be stored in a well-ventilated area where the
room size corresponds to the room area as specified for operation.
• The appliance shall be stored in a room without continuously
operating open flames (for example an operating gas appliance)
and ignition sources (for example an operating electric heater).
• Installation work must be performed in accordance with the
national wiring standards by authorized personnel only.
•The appliance shall be installed in accordance with national wiring
regulation.
CAUTION
• Two or more people must lift and transport the product.
- Avoid personal injury.
• Do not install the product where it will be exposed to sea wind
(salt spray) directly.
- It may cause corrosion on the product.
!

9
SAFETY INSTRUCTIONS
ENGLISH
• Keep level even when installing the product.
- To avoid vibration or noise.
• Do not install the product where the noise or hot air from the unit
could damage or disturb the neighborhoods.
- It may cause a problem for your neighbors and hence dispute.
• Always check for gas (refrigerant) leakage after installation or
repair of product.
- Low refrigerant levels may cause failure of product.
• Do not use the product for special purposes, such as preserving
foods, works of art, etc. It is a consumer AWHP, not a precision
refrigeration system.
- There is risk of damage or loss of property.
• Do not block the inlet or outlet of air flow.
- It may cause product failure.
• Use a soft cloth to clean. Do not use harsh detergents, solvents or
splashing water etc.
- There is risk of fire, electric shock, or damage to the plastic parts
of the product.
• Do not step on or put anything on the product.
- There is risk of personal injury and failure of product.
• Do not insert hands or other objects through the air inlet or outlet
while the product is operating.
- There are sharp and moving parts that could cause personal
injury.
• Be cautious when unpacking and installing the product.
- Sharp edges could cause injury.
• If the refrigerant gas leaks during the repair, do not touch the
leaking refrigerant gas.
- The refrigerant gas can cause frostbite (cold burn).
• Do not tilt the unit when removing or uninstalling it.
- The condensed water inside can spill.
• Do not mix air or gas other than the specified refrigerant used in
the system.
- If air enters the refrigerant system, an excessively high pressure
results, causing equipment damage or injury.
• If the refrigerant gas leaks during the installation, ventilate the area
immediately.
- Otherwise it can be harmful for your health.

10
SAFETY INSTRUCTIONS
ENGLISH
• Dismantling the unit, treatment of the refrigerant oil and eventual
parts should be done in accordance with local and national
standards.
• Do not expose your skin or kids or plants to the cool or hot air
draft.
- This could harm to your health.
• Use a firm stool or ladder when cleaning, maintaining or repairing
the product at an height.
- Be careful and avoid personal injury.
• The hot water may not be available immediately, during
disinfection operation or depending on the amount of hot water.
• During floor heating operation it is important to limit the
minimum/maximum water temperature.
• If anyone other than a licensed Professional installs, repairs, or
alters LG Electronics Air Conditioning Products, the warranty is
voided.
- All costs associated with repair are then the full responsibility of
the owner.
• Do not install the unit in potentially explosive atmospheres.
• Refrigerants are pre-charged in the factory to the outdoor unit.
Additional refrigerants need to be charged depending on the
length and size of pipe.
• The water may drip from the discharge pipe of the pressure-relief
device and that this pipe must be left open to the atmosphere.
• The pressure-relief device is to be operated regularly to remove
lime deposits and to verify that it is not blocked.
• If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified persons in
order to avoid a hazard. Installation work must be performed in
accordance with the national wiring standards by authorized
personnel only.

11
SAFETY INSTRUCTIONS
ENGLISH
This appliance is not intended for use by persons (including children)
with reduced physical, sensory or mental capabilities or lack of
experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a
person responsible for their safety.
Children should be supervised to ensure that they do not play with
the appliance.
This appliance can be used by children aged from 8 years and above
and persons with reduced physical, sensory or mental capabilities or
lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe
way and understand the hazards involved. Children shall not play
with the appliance. Cleaning and user maintenance shall not be
made by children without supervision.

12
PRODUCT INTRODUCTION
ENGLISH
Water
Out
Domestic Water In
Domestic
Water Out
Water
In
7
4
3
2
5
1
6
PRODUCT INTRODUCTION
Typical installation scene
1. Indoor unit
2. Outdoor unit
3. Refrigerant pipe and connecting cable
4. Water pipe
5. Ground wire to ground outdoor unit to prevent electrical shocks.
6. Remote controller
7. Water pipe for DHW tank
*The shape of products can be changed according to the model capacity and type.

13
PRODUCT INTRODUCTION
ENGLISH
OK
On/Off button
OK button
Back button
Up/Down/Left/Right
button
Operation display
window
Operation display window Operation and Settings status display
Back button When you move to the previous stage from the menu’s
setting stage
Up/down/left/right button When you change the menu’s setting value
OK button When you save the menu’s setting value
On/Off button When you turn ON/OFF the AWHP
NOTE
• The remote controller is located on the indoor unit from factory. It can be repositioned at
living space using cover plate accessory kit.
• Some functions may not be operated and displayed depending on the product type.
• The actual product can be different from above contents depending upon model type.
• When using simultaneous operation system, whenever press remote controller button,
system will approximately operate after 1~2 minutes.
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Related Information
Remote controller
* DHW: Domestic hot water
* IWT : Integrated water tank indoor unit
Refrigerant R32 / R410A
Max allowable
pressure
4.2
2.4
Operating
temperature of
leaving water
(Min. ~ Max.)
Heating [°C] For Fan coil unit / Radiator 15 ~ 50
For under floor 15 ~ 50
Cooling [°C] For Fan coil unit 5 ~ 27
For under floor 16 ~ 27
DHW 15 ~ 80
Inlet water pressure [MPa] (Min. ~ Max.) 0.03 ~ 0.3
Maximum DHW tank pressure [MPa] 1.0
High side [MPa]
Low side [MPa]

14
DESCRIPTION OF THE OPERATION
ENGLISH
DESCRIPTION OF THE OPERATION
Main screen
In the main screen, press [<, >(left/right)] button to select the category to set, and you can
control by pressing [∧,∨(up/down)] button.
Menu screen
In the main screen, press [<, >(left/right)] button to select the menu and press [OK] button to
move to menu screen.
In the menu screen, press [<, >(left/right)] button to select the category to set, and press [OK]
button to move to the detail screen.
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15
DESCRIPTION OF THE OPERATION
ENGLISH
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Setting screen
Select the category to set using [∧,∨(up/down)] button.
Popup screen
The toast message is the message displayed at the bottom of the screen when an operation is
turned On/Off or if a function is set / canceled.
The popup message is mainly displayed when an error occurred in the product.
In each detail screen of the menu, as in the box in the left figure,
when “<,>” icons are displayed at the same time, you can
immediately apply the setting value by pressing [<, >(left/right)]
button.
※For the values that can be set in each category, refer to the
detail manual for each function.
In each detail screen of the menu, as in the box in the left figure,
if only “>” icon is displayed, you can move to the detail setting
screen by pressing [>(right) or OK] button.
※For the values that can be set in each category, refer to the
detail manual for each function.
< Toast message > < Popup message >

16
DESCRIPTION OF THE OPERATION
ENGLISH
In the monitoring screen, you can see the more information by pressing [OK] button.
- The flow rate - The Water pressure
OK
- The outdoor temperature
- The DHW tank temperature
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Returning to the screen
In the main screen, after moving to the category by pressing [<, >(left/right)] button, if there is no
remote controller operation, after 10 seconds, it returns to the main screen basic position. (basic
position: indoor temperature display part)
In the screens except the main screen, if there is no remote controller operation for 1 minute, it
moves to the main screen.
Monitoring
In the main screen, you can enter the monitoring screen by pressing [Back] button
In the monitoring screen, you can check the following information,
- The room temperature
- The water inlet / outlet temperature
- The water pump operation

OPERATION SETTING
On / Off
will be turned on or off.
Press the remote controller’s (On/Off) button.
- If the product is in operation, On/Off button will be illuminated.
If the product is in off, On/Off button backlight will be off.
Operation mode
You can easily control the desired operation mode.
In the main screen, press [<,>(left/right)] button to select the operation mode or home leave or
hold category, and press [∧,∨(up/down)] button to set the operation mode.
※Some products may not support some operation modes.
Mode Description
Cool
Cool the room to the desired temperature.
Activated when No. 4 ON of indoor unit PCB DIP SW 2. (Refer to
installer setting.)
Heat Heats the room to the desired room temperature.
AI / Auto The product automatically provides the appropriate fan speed based on
the temperature of the room.
17
OPERATION SETTING
ENGLISH
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Hydro Kit

18
OPERATION SETTING
ENGLISH
NOTE
The compressor starts after 3 minutes and the cold water comes out.
In the cooling operation, you can select the desired temperature in the range of 5 °C~27 °C.
The favorable temperature difference between the water inlet temperature and outlet
temperature is 5 °C.
What is 3 minutes delay function?
After the cooling stops, when the product is started right away, the reason that the cold
water does not come out is that it is the function to protect the compressor.
The compressor starts after 3 minutes and the cold water comes out.
NOTE
Activated when No. 4 ON of indoor unit PCB DIP SW 2 (Refer to installer setting)
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Cooling operation
Cooling operation’s minimum setting temperature is 5 °C.
• The desired temperature can be controlled in the units of 1 °C.
- Set the desired temperature lower than the water temperature.
- water temperature is displayed on the default screen of the remote controller.
- If the setpoint is set higher than the water temperature, then the unit will remain in the cool
mode but will not begin to cool the water temperature exceeds the setpoint.
- If your unit is operating in cooling mode and you press the [On/Off] button the cooling operation
will shut off.

19
OPERATION SETTING
ENGLISH
NOTE
In the heating operation, you can select the desired temperature in the range of 15 °C~50 °C.
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Heating operation
• The desired temperature can be controlled in the units of 1 °C.
- Set the desired temperature higher than the water temperature.
- Water temperature is displayed on the default screen of the remote controller.
- When the desired temperature is set lower than the water temperature, warm water doesn't
come out.
- If your unit is operating in heating mode and you press the [On/Off] button the heating operation
will shut off.

20
OPERATION SETTING
ENGLISH
NOTE
The set temperature can be changed from 5 °C to -5 °C in 1 °C.
<Temperature adjust step (unit : °C)>
-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5
Cold Hot 
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AI / Auto operation
In order to save energy and to give highest comfort, setting temperature will follow outside
temperature. If outdoor temperature decreases, heating capacity for the house will increase
automatically in order to keep same room temperature. All parameters will be set by installer
during start-up procedure and will be adapted to the site characteristic.
1. Select AI / Auto mode.
2. Select the desired temperature category
3. Adjust the desired temperature level by press [∧,∨(up/down)] button.