LG Therma V HM091MRS User manual

INSTALLATION MANUAL
AIR-TO-WATER
HEAT PUMP
www.lg.com
Copyright © 2018 - 2021 LG Electronics Inc. All Rights Reserved.
MFL68026607
Rev.08_042221
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
[EU Representative] LG Electronics Inc. EU Representative : LG Electronics European Shared Service Center B.V.
Krijgsman 1, 1186 DM Amstelveen, The Netherlands
[ Manufacturer ] LG Electronics Inc. Changwon 2nd factory 84, Wanam-ro, Seongsan-gu, Changwon-si, Gyeongsangnam-do, KOREA
PORTUGUÊS
MAGYAR
БЪЛГАРСКИ
SRPSKI
HRVATSKI
SLOVENŠČINA
DANSK
ENGLISH ITALIANO ESPAÑOL
FRANÇAIS
DEUTSCH
ΕΛΛΗΝΙΚΆ
ČEŠTINA
NEDERLANDS
POLSKI
LIMBA ROMÂNĂ

TABLE OF CONTENTS
2
ENGLISH
4PREFACE
5SAFETY INSTRUCTIONS
12 INSTALLATION PART
13 GENERAL INFORMATION
13 Model Information
14 Model name and related information
15 Parts and Dimensions
18 Control Parts
20 Remote Controller
21 Typical Installation Example
27 Cycle Diagram
29 Water cycle
31 INSTALLATION
31 Transporting the Unit
32 Installation places
33 Seasonal Wind and Cautions in Winter
34 Foundation for Installation
35 Electrical Wiring
43 Wiring of main power supply and equipment capacity
44 Water Piping and Water Circuit Connection
46 Water Charging
46 Pipe Insulation
47 Water pump Capacity
47 Pressure Drop
48 Performance curve
49 Water Quality
49 Frost protection
50 Water Volume and Expansion Vessel Pressure
51 ACCESSORIES INSTALLATION
51 Accessories supported by LG Electronics
52 Accessories supported by 3rd party Companies
53 Before Installation
53 Thermostat
56 2nd Circuit
59 3rd Party Boiler
60 3rd Party Controller
61 Meter Interface
62 Central Controller
63 Remote Controller
66 DHW Tank
69 DHW Tank Kit
70 Solar Thermal Kit
71 Dry Contact
73 External Controller - Setting up programmable digital input operation
74 Remote Temperature Sensor
76 Solar pump
77 External pump
78 Wi-fi Modem
79 Energy State
80 Digital Input for energy saving (ESS, Smart Grid)
81 2Way Valve
82 3Way Valve(A)
83 3Way Valve(B)
84 Electric Heater
88 Final check
89 CONFIGURATION
89 DIP Switch Setting
TABLE OF CONTENTS

3
TABLE OF CONTENTS
ENGLISH
95 SERVICE SETTING
95 How to enter service setting
95 Service setting
96 Service Contact
97 Model Information
98 RMC Version lnformation
99 Open Source License
100 INSTALLER SETTING
100 How to enter installer setting
101 Installer setting
103 3 Minutes Delay
104 Select Temperature Sensor
105 Dry Contact Mode
106 Central Control Address
107 Pump test run
108 Air cooling set temp
109 Water cooling set temp
110 Air heating set temp
111 Water heating set temp
112 DHW set temp
113 Screed drying
115 Heater on temperature
117 Water supply off temp. during cooling
119 Tank disinfection setting 1, 2
120 Tank setting 1
121 Tank setting 2
123 Heater priority
124 DHW time setting
125 TH on/off Variable, heating air
126 TH on/off Variable, heating water
127 TH on/off Variable, cooling air
128 TH on/off Variable, cooling water
129 Heating temp. setting
130 Cooling temp. setting
131 Pump setting in heating
132 Pump setting. in cooling
133 Forced operation
134 CN_CC
135 Pump Capacity
136 Seasonal auto temp
138 Modbus Address
139 CN_EXT
140 Anti-freezing Temperature
141 Add Zone
142 Use External Pump
143 3rd Party Boiler
144 Meter Interface
145 Pump Prerun/Overrun
146 Solar Thermal System
148 Energy state
149 Data logging
150 Password Initialization
151 Overview settings
153 COMMISSIONING
153 Check List before Starting Operation
154 Starting Operation
155 Starting Operation flow chart
155 Airborne Noise Emission
156 Vacuum & Charge of Refrigerant
158 How to drain remaining water in the product
159 Troubleshooting

PREFACE
4
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 nine chapters. These chapters are classified according
to installation procedure. See the table below to get summarized information.
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 unit.
• Installation location, constraints on installation site, etc
• Electrical wiring at the unit.
• System set-up and configuration.
• Information about water pump
Chapter 5
• Information about supported accessories
• Specification, Constraints, and wiring are described.
• Before purchasing accessories, please find supported specification to buy proper
one.
Chapter 6 • Information about DIP switch setting
Chapter 7
• check and input service contact
• information about model and open source license
Chapter 8
• Information on the installer setup mode that sets the detailed functions of the
remote control
• Incorrectly setting the installer setup mode may result in product failure, personal
injury, or property loss, so this chapter requires a deeper understanding
Chapter 9
• Check points before starting operation are explained.
• Troubleshooting, maintenance, and error code list are presented to correct
problems

5
SAFETY INSTRUCTIONS
ENGLISH
SAFETY INSTRUCTIONS
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 (for 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.
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.

6
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
• Do not touch leaked refrigerant directly.
- There is risk of frostbite.

SAFETY INSTRUCTIONS
7
ENGLISH
• 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 authorizes
their competence to handle refrigerants safely in accordance
with an industry recognized assessment specification.
• Pipe-work shall be protected from physical damage and shall
not be installed in an unventilated space, if that space is
smaller than
1) The minimum floor area : 49.4 m2
2) The maximum refrigerant charge amount : 2.4 kg
• 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.
• Dismantling the unit, treatment of the refrigerant oil and
eventual parts should be done in accordance with local and
national standards.
• Ducts connected to an appliance shall not contain an ignition
source.
• 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.
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.

8
SAFETY INSTRUCTIONS
ENGLISH
• 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.
• Stop operation and close the window in storm or hurricane. If
possible, remove the unit from the window before the
hurricane arrives.
- There is risk of property damage, failure of unit, or electric
shock.
• Do not open the front cover of the unit while operation. (Do
not touch the electrostatic filter, if the unit is so equipped.)
- There is risk of physical injury, electric shock, or unit failure.
• Do not touch any electric part with wet hands. you should be
power off 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.

9
SAFETY INSTRUCTIONS
ENGLISH
• 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.
• Turn the main power on 6 hours ago before the product
starting operation.
- Otherwise, it may cause compressor damage.
• Do not touch electric parts for 10 minutes after main power
off.
- There is risk of physical injury, electric shock.
• The inside heater of product may operate during stop mode. It
is intended to protect the product.
• Be careful that some part of the control box are hot.
- There is risk of physical injury or burns.
• When the unit is soaked (flooded or submerged), contact an
Authorized Service Center.
- There is risk of fire or electric shock.
• Be cautious that water could not be poured to the unit directly.
- There is risk of fire, electric shock, or unit damage.
• Ventilate the unit from time to time when operating it together
with a stove, etc.
- There is risk of fire or electric shock.
• Turn the main power off when cleaning or maintaining the unit.
- There is risk of electric shock.
• Take care to ensure that nobody could step on or fall onto the
unit.
- This could result in personal injury and unit damage.
• For installation, always contact the dealer or an Authorized
Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• If the unit is not used for long time, we strongly recommend
not to switch off the power supply to the unit.
- There is risk of water freezing.
• The appliance shall be stored in a well-ventilated area where
the room size corresponds to the room area as specified for
operation.

10
SAFETY INSTRUCTIONS
ENGLISH
• 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.
•
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.
• When mechanical connectors are reused indoors, sealing parts
shall be renewed. When flared joints are reused indoors, the
flare part shall be re-fabricated.
• Be aware that refrigerants may not contain an odor.
• Periodic(more than once/year) cleaning of the dust or salt
particles stuck on the heat exchangers by using water.
• Keep any required ventilation openings clear of obstruction.
CAUTION
Installation
• Always check for gas (refrigerant) leakage after installation or
repair of unit.
- Low refrigerant levels may cause failure of unit.
• Keep level even when installing the unit.
- To avoid vibration or water leakage.
• Use two or more people to lift and transport the unit.
- Avoid personal injury.
• Do not install the unit in potentially explosive atmospheres.
• Connect the water for filling or refilling the heating system as
specified by EN 1717/EN 61770 to avoid contamination of
drinking water by return flow.
Operation
• Do not use the unit for special purposes, such as preserving
foods, works of art, etc.
- There is risk of damage or loss of property.
!