LG THERMA V User manual

INSTALLATION MANUAL
AIR-TO-WATER
HEAT PUMP
www.lg.com
Please read this installation manual completely before installing the
product. Installation work must be performed in accordance with the
national wiring standards by authorized personnel only. Please retain
this installation manual for future reference after reading it thoroughly.
Original instruction
Copyright © 2023 LG Electronics Inc. All Rights Reserved.
MFL68681837
Rev.00_010323
ENGLISH ITALIANO ESPAÑOL FRANÇAIS DEUTSCH
ΕΛΛΗΝΙΚΆ
ČEŠTINA
NEDERLANDS
POLSKI
LIMBA ROMÂNĂ
PORTUGUÊS
MAGYAR
БЪЛГАРСКИ
SRPSKI
HRVATSKI
SLOVENŠČINA
DANSK

2
TABLE OF CONTENTS
ENGLISH
7 PREFACE
[Chapter 1]
8 SAFETY INSTRUCTIONS
[Chapter 2]
20 INSTALLATION PART
[Chapter 3]
22 GENERAL INFORMATION
22 Model Information
24 Related Information
25 Parts and Dimensions
29 Control Parts
30 Control Panel
31 Typical Installation Example
36 Cycle Diagram
37 Water cycle
[Chapter 4]
39 INSTALLATION OF OUTDOOR UNIT
39 Conditions where Outdoor Unit is Installed
39 Drill a Hole in the Wall
40 Multiple installation
42 Transporting the Unit
44 Installation at Seaside
45 Seasonal wind and cautions in winter
TABLE OF CONTENTS

3
TABLE OF CONTENTS
ENGLISH
[Chapter 5]
46 INSTALLATION OF INDOOR UNIT
46 Conditions where Indoor Unit is Installed
49 Floor area requirement : Indoor unit
50 Ventilation requirements
55 Electrical Wiring
[Chapter 6]
59 PIPING AND WIRING FOR OUTDOOR UNIT
59 Refrigerant Piping
60 Preparation for Piping
61 Connecting Pipe to Indoor Unit
61 Connecting Pipe to Outdoor Unit
63 Finalizing
64 Leakage test and Evacuation
[Chapter 7]
66 PIPING AND WIRING FOR INDOOR UNIT
66 Water Piping and Water Circuit Connection
69 Water pump Capacity
69 Pressure Drop
70 Performance curve
71 Water Quality
71 Frost protection by antifreeze
72 Water Volume and Expansion Vessel Pressure
73 Electrical Wiring
[Chapter 8]
76 ACCESSORIES INSTALLATION
79 Before Installation
79 Thermostat

4
TABLE OF CONTENTS
ENGLISH
82 2nd Circuit
84 3rd Party Boiler
85 3rd Party Controller
86 Meter Interface
87 Central Controller
88 DHW Tank
91 DHW Tank Kit
93 Solar Thermal Kit
94 Dry Contact
96 External Controller - Setting up programmable digital input operation
97 Remote Temperature Sensor
100 Solar pump
101 External pump
102 Wi-fi Modem
103 Energy State
104 Digital Input for energy saving (ESS, Smart Grid)
105 2Way Valve
106 3Way Valve(A)
107 Final check
[Chapter 9]
108 CONFIGURATION
108 DIP Switch Setting
114 SERVICE SETTING
114 How to enter service setting
114 Service setting
115 Service contact
116 Model information
117 RMC version Information
118 Open source license
119 INSTALLER SETTING
119 How to enter installer setting
120 Installer Setting
123 Select Temperature Sensor

5
TABLE OF CONTENTS
ENGLISH
124 Use Heating Tank Heater
125 Mixing Circuit
127 Use External Pump
128 RMC master/slave
129 LG Therma V Configuration
130 Forced operation
131 Pump Prerun/Overrun
132 Water Flow Control
133 Energy Monitoring
134 Anti-Freezing Option 1
135 Password Reset
136 Screed drying
138 Heater on temperature
140 Air heating set temp.
141 Water heating set temp.
142 Hysteresis Room Air(Heating)
143 Hysteresis Heating Water
144 Heating temp. setting
145 Pump setting in heating
146 Air cooling set temp.
147 Water cooling set temp.
148 Water supply off temp. during cooling
150 Hysteresis Room Air(Cooling)
151 Hysteresis Cooling Water
152 Cooling temp. setting
153 Pump setting in cooling
154 Seasonal auto temp.
157 Heater priority
158 DHW set temp.
159 Tank disinfection setting 1, 2
160 Tank setting 1
161 Tank setting 2
163 DHW time setting
165 Recirculation time
166 Solar Thermal System
168 Pump test run
169 Frost Protection Temp.
170 BUH for DHW in emerg.

6
TABLE OF CONTENTS
ENGLISH
171 Dry Contact Mode
172 Central Control Address
173 CN_CC
174 Energy state
177 Thermostat control type
178 Pump operation time
179 IDU operation time
180 Modbus Address
181 Modbus gateway memory map
184 CN_EXT
185 3rd Party Boiler
186 Meter Interface
187 Current flow rate
188 Data logging
[Chapter 10]
189 COMMISSIONING
189 Check List before Starting Operation
190 Starting Operation
191 Starting Operation flow chart
191 Airborne Noise Emission
192 Vacuum & Charge of Refrigerant
195 Trouble shooting

7
PREFACE
ENGLISH
PREFACE
This installation manual is to present information and guide about understanding, installing,
and checking .
Your careful reading before installation is highly appreciated to make no mistake and to prevent
potential risks. The manual is divided into ten chapters. These chapters are classified according to
installation procedure. See the table below to get summarized information.
REMARK : ALL CONTENTS OF THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE.
TO GET THE LATEST INFORMATION, PLEASE VISIT LG ELECTRONICS WEB SITE.
* The feature may be vary according to the type of model.
Chapters Contents
Chapter 1
• Warning and Caution concerned with safety.
• This chapter is directly related with human safety. We strongly recommend reading this
chapter carefully.
Chapter 2
• Items Inside product Box
• Before starting installation, please make it sure that all parts are found inside the product
box.
Chapter 3
• Fundamental knowledge about
• Model identification, accessories information, refrigerant and water cycle diagram, parts
and dimensions, electrical wiring diagrams, etc.
• This chapter is important to understand
Chapter 4
• Installation about the outdoor unit.
• Installation location, constraints on installation site, etc
Chapter 5
• Installation about the indoor unit.
• Installation location, constraints on installation site, etc
• Constrains when accessories are installed
Chapter 6
• How to perform piping (for refrigerant) and wiring at the outdoor unit.
• Refrigerant pipe connection between the indoor unit and the outdoor unit.
• Electrical wiring at the outdoor unit.
Chapter 7
• How to perform piping (for water) and wiring at the indoor unit.
• Water pipe connection between the indoor unit and pre-built under floor water loop pipe.
• Electrical wiring at the indoor unit.
• System set-up and configuration.
• As many control parameters of is adjustable by control panel, deep
understanding about this chapter is required to secure the operation flexibility of
• For more detailed information, please read the separate operation manual to use control
panel and adjust control parameters.
Chapter 8
• Information about supported accessories
• Specification, Constraints, and wiring are described.
• Before purchasing accessories, please find supported specification to buy proper one.
Chapter 9 • Test operation and check point while test running.
Chapter 10
• Check points before starting operation are explained.
• Troubleshooting, maintenance, and error code list are presented to correct problems.

8
SAFETY INSTRUCTIONS
ENGLISH
Read the precautions in
this manual carefully
before operating the unit.
This appliance is filled
with flammable refrigerant
(R32)
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.
SAFETY INSTRUCTIONS
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.
WARNING
Installation
• Do not use a defective or underrated circuit breaker. Use this
appliance on a dedicated circuit.
- There is risk of fire or electric shock.
!

9
SAFETY INSTRUCTIONS
ENGLISH
• For electrical work, contact the dealer, seller, a qualified
electrician, or an Authorized Service Center.
- There is risk of fire or electric shock.
• Always ground the unit.
- 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.
• Always install a dedicated circuit and breaker.
- Improper wiring or installation may cause fire or electric
shock.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric.
• Do not modify or extend the power cable.
- There is risk of fire or electric shock.
• Do not install, remove, or reinstall the unit by yourself
(customer).
- There is risk of fire, electric shock, explosion, or injury
• For antifreeze, always contact the dealer or an authorized
service center.
- Almost the antifreeze is a toxic product.
• For installation, always contact the dealer or an authorized
Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install the unit on a defective installation stand.
- It may cause injury, accident, or damage to the unit.
• Be sure the installation area does not deteriorate with age.
- If the base collapses, the unit could fall with it, causing
property damage, unit failure, and personal injury.
• Do not install the water pipe system as Open loop type.
- It may cause failure of unit.

10
SAFETY INSTRUCTIONS
ENGLISH
• Use a vacuum pump or inert (nitrogen) gas when doing
leakage test or purging air. Do not compress air or oxygen and
do not use flammable gases.
- There is the risk of death, injury, fire or explosion.
• Make sure the connected condition of connector in product
after maintenance.
- Otherwise, it may cause product damage.
• Do not touch leaked refrigerant directly.
- There is risk of frostbite.
• Copper in contact with refrigerants shall be oxygen-free or
deoxidized, for example Cu-DHP as specified in EN 12735-1
and EN 12735-2.
• Compliance with national gas regulations shall be observed.
• Refrigerant tubing shall be protected or enclosed to avoid
damage.
• The installation of pipe-work shall be kept to a minimum.
• A brazed, welded, or mechanical connection shall be made
before opening the valves to permit refrigerant to flow
between the refrigerating system parts. A vacuum valve shall
be provided to evacuate the interconnecting pipe and/or any
uncharged refrigerating system part.
• 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.
• Do not use means to accelerate the defrosting process or to
clean, other than those recommended by the manufacturer.
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odour.