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LG Multi V i PRHRZ020 Installation Manual
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LG Multi V i PRHRZ020 Installation Manual

LG Multi V i PRHRZ020 Installation Manual

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INSTALLATION MANUAL
AIR
CONDITIONER
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
MFL32987325
Rev.00_051424
Copyright © 2024 LG Electronics Inc. All Rights Reserved.
www.lg.com

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Summary of Contents for LG Multi V i PRHRZ020

  • Page 1 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 www.lg.com MFL32987325 Rev.00_051424 Copyright © 2024 LG Electronics Inc. All Rights Reserved.

  • Page 2: Tips For Saving Energy

    TIPS FOR SAVING ENERGY TIPS FOR SAVING ENERGY Here are some tips that will help you minimize the power consumption when you use the air conditioner. You can use your air conditioner more efficiently by referring to the instructions below: •...

  • Page 3: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS IMPORTANT SAFETY INSTRUCTIONS READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE. Always comply with the following precautions to avoid dangerous situations and ensure peak performance of your product. WARNING It can result in serious injury or death when the directions are ignored.
  • Page 4 IMPORTANT SAFETY INSTRUCTIONS Installation • If a stationary appliance is not fitted with a supply cord and a plug, or with other means for disconnection from supply mains having a contact separation in all poles that provide full disconnection under overvoltage category III conditions, the instructions shall state that means for disconnection must be incorporated in the fixed wiring in accordance with the wiring rules.
  • Page 5 IMPORTANT SAFETY INSTRUCTIONS • Use the correctly rated breaker or fuse. - There is risk of fire or electric shock. • Prepare for strong wind or earthquake and install the unit at the specified place. - Improper installation may cause the unit to topple and result in injury.
  • Page 6 Operation • Do not damage or use an unspecified power cord. - There is risk of fire, electric shock, explosion, or injury. • Use a dedicated outlet for this appliance. - There is risk of fire or electrical shock. • Be cautious that water could not enter the product. - There is risk of fire, electric shock, or product damage.
  • Page 7 IMPORTANT SAFETY INSTRUCTIONS • Do not install the unit where combustible gas may leak. - If the gas leaks and accumulates around the unit, an explosion may result. • Use power cables of sufficient current carrying capacity and rating. - Cables that are too small may leak, generate heat, and cause a fire.
  • Page 8 IMPORTANT SAFETY INSTRUCTIONS • Do not block the inlet or outlet. - It may cause failure of appliance or accident. • Make the connections securely so that the outside force of the cable may not be applied to the terminals. - Inadequate connection and fastening may generate heat and cause a fire.
  • Page 9 IMPORTANT SAFETY INSTRUCTIONS • Do not touch any of the refrigerant piping during and after operation. - It can cause a burn or frostbite. • Do not operate the air conditioner with the panels or guards removed. - Rotating, hot, or high-voltage parts can cause injuries. •...
  • Page 10 IMPORTANT SAFETY INSTRUCTIONS • Remote located within 2 m horizontal distance in line of sight of the unit and on a wall within the room in which the unit is installed; and - 100 mm above the floor where h is not more than 300 mm from the floor: or - 300 mm above the floor where h...
  • Page 11 IMPORTANT SAFETY INSTRUCTIONS Safety precautions for R32 model 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.
  • Page 12 IMPORTANT SAFETY INSTRUCTIONS • Refrigerant tubing shall be protected or enclosed to avoid damage. • Flexible refrigerant connectors (such as connection lines between the indoor and outdoor unit) that may be displaced during normal operations shall be protected against mechanical damage. •...
  • Page 13 IMPORTANT SAFETY INSTRUCTIONS • General work area All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out. Work in confined spaces shall be avoided. • Checking for presence of refrigerant The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially flammable atmospheres.
  • Page 14 IMPORTANT SAFETY INSTRUCTIONS The following checks shall be applied to installations using flammable refrigerants: - The actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are installed - The ventilation machinery and outlets are operating adequately and are not obstructed - If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant...
  • Page 15 IMPORTANT SAFETY INSTRUCTIONS • Repairs to sealed components During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.
  • Page 16 IMPORTANT SAFETY INSTRUCTIONS • Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant.
  • Page 17 IMPORTANT SAFETY INSTRUCTIONS j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off. k) Recovered refrigerant shall not be charged into another refrigerating system unless it has been cleaned and checked.
  • Page 18 IMPORTANT SAFETY INSTRUCTIONS • Leak detection methods The following leak detection methods are deemed acceptable for systems containing flammable refrigerants. Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
  • Page 19 IMPORTANT SAFETY INSTRUCTIONS • Removal and evacuation When breaking into the refrigerant circuit to make repairs - or for any other purpose – conventional procedures shall be used. However, for flammable refrigerants it is important that best practice is followed since flammability is a consideration. The following procedure shall be adhered to: - Remove refrigerant;...
  • Page 20 IMPORTANT SAFETY INSTRUCTIONS • Charging procedures In addition to conventional charging procedures, the following requirements shall be followed. - Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained in them.
  • Page 21 IMPORTANT SAFETY INSTRUCTIONS The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order.

  • Page 22: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS TIPS FOR SAVING ENERGY IMPORTANT SAFETY INSTRUCTIONS FEATURES INSTALLATION PART Dimensional drawings INSTALLATION Selection of the best location HR Unit Installation Connecting the Strainer Connecting the drain hose Drain test Insulation Wiring Connection Connecting the ventilation duct Dry contact Electric Characteristics HR Unit PCB...

  • Page 23: Features

    FEATURES FEATURES Connection Pipe (to outdoor unit) Control Box Connection Pipe Connection Pipe (to outdoor unit) (to indoor unit) Connection Hole (To ventilation duct) Drainage hole Supplementary drain hole Type of HR unit 2 port HR unit 3 port HR unit 4 port HR unit Max.

  • Page 24: Installation Part

    INSTALLATION PART INSTALLATION PART - Installation Manual - Hanging bolts (4 x M10 or M8), Nut(8 x M10 or M8), Flat washers(8 x M10) : Field supply - Reducers - Strainer - Metal clamp [Unit : mm] Gas pipe Type of HR unit Liquid pipe High pressure Low pressure...

  • Page 25: Dimensional Drawings

    INSTALLATION INSTALLATION Selection of the best location Select installation location of the HR unit suitable for following conditions - Avoid a place where rain may enter since the HR unit is for indoor. - Sufficient service space must be obtained. - Refrigerant pipe must not exceed limited length.
  • Page 26 INSTALLATION [Unit : mm] Type of HR unit Part Name 3 port / 4 port 2 port Description Low pressure Gas pipe Ø 28.58 Brazing connection Ø 22.2 Brazing connection connection port High pressure Gas pipe Ø 22.2 Brazing connection Ø...

  • Page 27: Hr Unit Installation

    INSTALLATION HR Unit Installation Using an insert-hole-in- anchor, hang the suspension bolt. - Select and mark the position for fixing bolts. Install a six-sided nut and a flat washer - Drill the hole for set anchor on the face of (locally-procured)to the suspension bolt as ceiling.

  • Page 28: Connecting The Strainer

    INSTALLATION Connecting the Strainer - Connect the strainer to the HR unit directly. If there is not enough space to install the strainer, install it between the outdoor unit and the HR unit connection pipe. The distance between the strainer and the HR unit should be within 3 m. Parallel connection with the HR unit (Except PRHRZ020) Installing between the outdoor unit and HR unit High pressure gas pipe...
  • Page 29 INSTALLATION CAUTION HR Unit should be installed that top side is facing up. If not, it may cause failure of the product. Ceiling Top side Top side...
  • Page 30 INSTALLATION WARNING Before brazing work, remove gas in the HR Unit by cutting the three pipes in the small circles on the figure. If not, it may cause injuries. Remove the caps before connecting pipes. High pressure gas pipe Liquid pipe Low pressurse gas pipe Gas pipe Ø...

  • Page 31: Connecting The Drain Hose

    INSTALLATION Connecting the drain hose CAUTION Improper connection to the drain hose can cause a leak. In this case, it may damage the installation space and the surrounding environment. NOTE When connecting drain pipes, the pipe must be laid with a downward slope (1/50 to 1/100). : Be sure not to provide up-and-down slope to prevent reversal flow.

  • Page 32: Insulation

    INSTALLATION Insulation Insulate the connected pipes completely(all thermal insulation must comply with local requirement) Make sure that there is no clearance here Thermal insulator for refrigerant pipe(Local supply) Ø38 Overlap with thermal Refrigerant pipe insulator for piping (Local supply) Thermal insulator for refrigerant pipe (Local supply) CAUTION Insulate completely unconnected pipes as shown in the Figure.

  • Page 33: Wiring Connection

    INSTALLATION Wiring Connection Connect the wires to the terminals on the control board individually according to the outdoor unit connection. - Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of HR Unit respectively.

  • Page 34: Connecting The Ventilation Duct

    INSTALLATION Connecting the ventilation duct WARNING Do NOT install a working ignition source during ventilation duct connection work. When a refrigerant leak is detected, it is necessary to install a ventilation fan to ventilate. Cut both ends of the hole that connects to the ventilation fan. Ends of the connection hole Ventilation kits such as flanges (PTVK430) are connected using screws (4 EA).

  • Page 35: Dry Contact

    INSTALLATION Dry contact If you want to activate the damper and fan when a leak signal is generated from the refrigerant leak detection sensor, you will need to purchase and install dry contacts separately. - When connected to the central controller and dry contact at the same time. Field Installation Power Supply Damper...

  • Page 36: Electric Characteristics

    INSTALLATION Electric Characteristics - Recommended circuit breaker is ELCB - MFA is used to select the circuit breaker and ground fault circuit interrupter - Refer to the PDB about detail electric characteristics ELCB : Earth Leakage Circuit Breaker MFA : Maximum Fuse Amperes(A) PDB : Product Data Book CAUTION •...

  • Page 37: Hr Unit Pcb

    INSTALLATION HR Unit PCB Branch No. Main PCB Main PCB (Master) SC EEV Bypass EEV Dry contact Branch #3,4 High/Low(from top) 7-SEG Branch #1,2 Liquid Bypass High/Low (from top) Valve Branch #3,4,1,2 Shut off Valve Gas pipe/Liquid pipe - SW01D/SW01C/SW01E (from top) SW02B/SW01B/SW02E - SW01E: Branch #1~4...

  • Page 38: Setup The Switch Of Hr Unit

    INSTALLATION Setup the switch of HR Unit Function - Selection of the method for pipe detection - Selection of Master/Slave Main PCB SW02E (8 pin DIP SW) - Setting the Zoning Control - Selection of the No. of connected branches DIP SW SW01E - Selection of the valve to address...
  • Page 39 INSTALLATION Selection of the method for pipe detection of an HR unit (Auto/Manual) Auto Manual Switch No.1 Off Switch No.1 On Master Master * Master Only Setting the zoning control SW02E setting SW01E setting * Master Only Master Normal control SW01E * Master Only Master...
  • Page 40 INSTALLATION Main function of SW01D Selection of the Valve Group Control NOTE Use the Valve Group Control when 2 branches are connected with only 1 indoor unit which has higher capacity than 61 kBTU. Valve Group SW01D Setting Not control No.
  • Page 41 INSTALLATION SW01C (Rotary S/W for addressing HR unit) Must be set to '0' when installing only one HR unit. When installing multiple HR units, address the HR units with sequentially increasing numbers starting from '0'. Maximum 16 HR Units can be installed. Ex) Installation of 3 HR units * Master Only...
  • Page 42 INSTALLATION SW01B/SW01C/SW01E/SW02B (DIP S/W and push S/W for Manual pipe detection) - Set the address of the valve of the HR unit to the central control address of the connected indoor unit. - SW01E: selection of the valve to address SW02B: increase in the digit of 10 of valve address SW01B: increase in the last digit of valve address SW01C: Manual addressing of zoning indoor units (use for Zoning setting)
  • Page 43 INSTALLATION Normal setting (Non-Zoning setting) Ex) Manual pipe detection of Valve #1, 2. Master Master Master SW01E SW02B SW01B SW01E SW #1 On : Select Valve #1 Input the central control SW #1 Off : Finish Valve #1 address of Indoor unit Master Master Master...

  • Page 44: Coil Exchanging Method

    COIL EXCHANGING METHOD COIL EXCHANGING METHOD Remove the 2 securing screws. Remove the 6 securing screws. Remove the cover by pulling on the Lift up and pull on the cover. bottom of the cover and lifting up. Exchange the coil. NOTE Be sure that system power off before exchanging the coil.

  • Page 45: Joint Method Of Hr Unit

    JOINT METHOD OF HR UNIT JOINT METHOD OF HR UNIT Joint Method is required when use indoor unit that exceed 61 kBtu is installed. In Joint Method, two neighboring outlets of one HR unit are linked by Y branch pipe and connected to one indoor unit.

  • Page 46: Special Requirements

    SPECIAL REQUIREMENTS SPECIAL REQUIREMENTS Flow chart For Installation Is the area of A satisfied? Installation (5/4) = (m / (2.5 x (LFL) ≤ 15.964 kg not less than A / (0.75 x LFL x h Installation by adding natural ventilation *Refer to Table 1 *Refer to Table 2 Is the area of A...
  • Page 47 SPECIAL REQUIREMENTS Table 1: Minimum installation required area Minimum installation Minimum installation Minimum installation Total amount Total amount Total amount required area (m required area (m required area (m of refrigerant of refrigerant of refrigerant in the system in the system in the system Ceiling mounted Wall mounted...
  • Page 48 SPECIAL REQUIREMENTS Minimum installation Minimum installation Minimum installation Total amount Total amount Total amount required area (m required area (m required area (m of refrigerant of refrigerant of refrigerant in the system in the system in the system Ceiling mounted Wall mounted Ceiling mounted Wall mounted...
  • Page 49 SPECIAL REQUIREMENTS Table 2: Minimum installation required area For the lower opening: - It is not an opening to the outside - The opening cannot be closed - The opening must be ≥ Anv - The area of any openings above 300 mm from the floor does not count when determining Anv - At least 50% of Anv is less than 200 mm above the floor - The bottom of the lower opening is ≤100 mm from the floor...
  • Page 51 : LG Electronics European Shared Service Center B.V. Krijgsman 1, 1186 DM Amstelveen, The Netherlands LG Electronics Inc. Single Point of Contact (EU/UK) : LG Electronics European Shared Service Center B.V. Krijgsman 1, 1186 DM Amstelveen, The Netherlands Manufacturer : LG Electronics Inc.
  • Page 52 Representative : LG Electronics Inc. Single Point of Contact (EU/UK) & EU Importer : LG Electronics European Shared Service Center B.V. Krijgsman 1, 1186 DM Amstelveen, The Netherlands Manufacturer : LG Electronics Inc. 84, Wanam-ro, Seongsan-gu, Changwon-si, Gyeongsangnam-do, KOREA UK Importer : LG Electronics U.K.