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 © 2017 - 2020 LG Electronics Inc. All Rights Reserved.
MFL68681810
Rev.13_102720
ENGLISH ITALIANO ESPAÑOL FRANÇAIS DEUTSCH
ΕΛΛΗΝΙΚΆ
ČEŠTINA
NEDERLANDS
POLSKI
LIMBA ROMÂNĂ
PORTUGUÊS
MAGYAR
БЪЛГАРСКИ
SRPSKI
HRVATSKI
SLOVENŠČINA

TABLE OF CONTENTS
2
ENGLISH
6PREFACE
7SAFETY INSTRUCTIONS
15 INSTALLATION PART
18 GENERAL INFORMATION
18 Model Information
23 Model name and related information
24 Parts and Dimensions
37 Control Parts (For Split)
39 Control Parts (For Hydrosplit)
40 Control Panel
41 Typical Installation Example
46 Cycle Diagram (For R410A)
48 Cycle Diagram (For R32 Split)
49 Cycle Diagram (For Hydrosplit)
50 Water cycle (For R410A)
52 Water cycle (For R32 Split)
54 Water cycle (For Hydrosplit)
56 INSTALLATION OF OUTDOOR UNIT
56 Conditions where Outdoor Unit is Installed
56 Drill a Hole in the Wall (For Split)
57 Transporting the Unit
59 Installation at Seaside
60 Seasonal wind and cautions in winter
61 INSTALLATION OF INDOOR UNIT
61 Conditions where Indoor Unit is Installed
64 Flow area requirement : indoor unit(For R32 Split)
65 Ventilation requirements
68 Electrical Wiring
71 PIPING AND WIRING FOR OUTDOOR UNIT
71 Refrigerant Piping
72 Preparation for Piping
73 Connecting Pipe to Indoor Unit
73 Connecting Pipe to Outdoor Unit
76 Finalizing
77 Leakage test and Evacuation
81 Electrical Wiring
87 PIPING AND WIRING FOR INDOOR UNIT
87 Water Piping and Water Circuit Connection
91 Water pump Capacity
91 Pressure Drop
92 Performance curve
94 Water Quality
94 Frost protection
95 Water Volume and Expansion Vessel Pressure
TABLE OF CONTENTS

3
TABLE OF CONTENTS
ENGLISH
96 ACCESSORIES INSTALLATION
98 Before Installation
98 Thermostat
106 3rd Party Boiler
107 3rd Party Controller
108 Meter Interface
109 Central Controller
110 DHW Tank
113 DHW Tank Kit
115 Solar Thermal Kit (For Split)
117 Solar Thermal System (For Hydrosplit)
118 Dry Contact
120 External Controller - Setting up programmable digital input operation
121 Remote Temperature Sensor
123 Solar pump
124 External pump
125 Wi-fi Modem
126 Smart Grid (For Split)
127 Energy State (For Hydrosplit)
128 Digital Input for energy saving (ESS, Smart Grid)(For Hydrosplit)
129 2Way Valve
130 3Way Valve(A)
131 3Way Valve(B)
132 Final check
133 CONFIGURATION
133 DIP Switch Setting (For Split)
138 DIP Switch Setting (For Hydrosplit)
144 SERVICE SETTING
144 How to enter service setting
144 Service setting
145 Service contact
146 Model information
147 RMC version lnformation
148 Open source license
149 INSTALLER SETTING
149 How to enter installer setting
150 Installer setting (For Split)
152 3 Minutes Delay
153 Select Temperature Sensor
154 Dry Contact Mode
155 Central Control Address
156 Pump test run
157 Air cooling set temp.
158 Water cooling set temp.
159 Air heating set temp.
160 Water heating set temp.
161 DHW set temp.
162 Screed drying
164 Heater on temperature
166 Water supply off temp. during cooling
168 Tank disinfection setting 1, 2

4
TABLE OF CONTENTS
ENGLISH
169 Tank setting 1
170 Tank setting 2
172 Heater priority
173 DHW time setting
174 TH on/off Variable, heating air
175 TH on/off Variable, heating water
176 TH on/off Variable, cooling air
177 TH on/off Variable, cooling water
178 Heating temp. setting
179 Cooling temp. setting
180 Pump setting in heating
181 Pump setting in cooling
182 Forced operation
183 CN_CC
184 Pump frequency setting (RPM)
185 Pump Capacity
186 Smart Grid(SG)
187 Seasonal auto temp.
189 Modbus Address
190 CN_EXT
191 Anti-freezing Temperature
192 Add Zone
193 Use External Pump
194 3rd Party Boiler
195 Meter Interface
196 Pump Prerun/Overrun
197 Solar Thermal System
199 Current flow rate
200 Data logging
201 Password Initialization
202 Power Supply Blockage (Smart Grid)
203 Overview settings
205 Installer setting (For Hydrosplit)
208 Select Temperature Sensor
209 Use Heating Tank Heater
210 Mixing Circuit
211 Use External Pump
211 RMC master/slave
212 LG Therma V Configuration
213 Forced operation
214 Pump Prerun/Overrun
215 Water Flow Control
216 Password Reset
217 Screed drying
219 Heater on temperature
221 Air heating set temp.
222 Water heating set temp.
223 Hysteresis Room Air(Heating)
224 Hysteresis Heating Water
225 Heating temp. setting
226 Pump setting in heating
227 Air cooling set temp.
228 Water cooling set temp.
229 Water supply off temp. during cooling
231 Hysteresis Room Air(Cooling)
232 Hysteresis Cooling Water

5
TABLE OF CONTENTS
ENGLISH
233 Cooling temp. setting
234 Pump setting in cooling
235 Seasonal auto temp.
238 Heater priority
239 DHW set temp.
240 Tank disinfection setting 1, 2
241 Tank setting 1
242 Tank setting 2
244 DHW time setting
245 Solar Thermal System
247 Pump test run
248 Frost Protection Temp.
249 Dry Contact Mode
250 Central Control Address
251 CN_CC
252 Energy state
253 Thermostat control type
254 Pump operation time
255 IDU operation time
256 Modbus Address
257 Modbus gateway memory map
260 CN_EXT
261 3rd Party Boiler
262 Meter Interface
263 Current flow rate
264 Data logging
265 COMMISSIONING
265 Check List before Starting Operation
266 Starting Operation
267 Starting Operation flow chart
267 Airborne Noise Emission
267 Limiting concentration(For R410A)
268 Vacuum & Charge of Refrigerant
271 Troubleshooting

PREFACE
6
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.
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.

7
SAFETY INSTRUCTIONS
ENGLISH
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.
• For electrical work, contact the dealer, seller, a qualified
electrician, or an Authorized Service Center.
- 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 (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.

8
SAFETY INSTRUCTIONS
ENGLISH
• 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.
• 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.

SAFETY INSTRUCTIONS
9
ENGLISH
• 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.
(for R32)
• Refrigerant tubing shall be protected or enclosed to avoid
damage. (for R32)
• The installation of pipe-work shall be kept to a minimum. (for
R32)
• 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. (for R32)
• 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. (for
R32)
• Do not use means to accelerate the defrosting process or to
clean, other than those recommended by the manufacturer.
(for R32)
• Do not pierce or burn. (for R32)
• Be aware that refrigerants may not contain an odour. (for R32)
• Dismantling the unit, treatment of the refrigerant oil and
eventual parts should be done in accordance with local and
national standards. (for R32)
• Flexible refrigerant connectors (such as connecting lines
between the indoor and outdoor unit) that may be displaced
during normal operations shall be protected against mechanical
damage. (for R32)

10
SAFETY INSTRUCTIONS
ENGLISH
• Pipe-work shall be protected from physical damage. (for R32)
• Mechanical connections (mechanical connectors or flared
joints) shall be accessible for maintenance purposes. (for R32)
Operation
• 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 place anything on the power cable.
- There is risk of fire or electric shock.
• Do not plug or unplug the power supply plug during operation.
- There is risk of fire or electric shock.
• Do not touch (operate) the unit with wet hands.
- There is risk of fire or electric shock.
• Do not place a heater or other appliances near the power
cable.
- There is risk of fire or electric shock.
• Do not allow water to run into electric parts.
- There is risk of fire, failure of the unit, or electric shock.
• Do not store or use flammable gas or combustibles near the
unit.
- There is risk of fire or failure of unit.
• Do not use the unit in a tightly closed space for a long time.
- It may cause damage to the unit.
• When flammable gas leaks, turn off the gas and open a
window for ventilation before turning the unit on.
- There is risk of explosion or fire.
• If strange sounds, or smell or smoke comes from unit, turn the
breaker off or disconnect the power supply cable.
- There is risk of electric shock or fire.