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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.
TYPE: Ceiling Concealed Duct - Low Static
P/NO : MFL42803121
www.lg.com
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Table of Contents
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Summary of Contents for LG MFL42803121
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Page 1: Installation Manual
• 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. TYPE: Ceiling Concealed Duct - Low Static www.lg.com P/NO : MFL42803121... -
Page 2: Indoor Unit
IMPORTANT! Please read this instruction sheet completely before installing the product. This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently. WARNING •... -
Page 3: Table Of Contents
Ceiling Concealed Duct - Low Static Type Indoor Unit Installation Manual TABLE OF CONTENTS Required Parts Required Tools Installation Requirements Safety Precautions....4 Introduction......7 o Level gauge Installation o Four type "A" screws o Screw driver o Connecting cable o Electric drill o Hole core drill Selection of the best location ........8... -
Page 4: Safety Precautions
Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. n Be sure to read before installing the air conditioner. n Be sure to observe the cautions specified here as they include important items related to safety. n Incorrect operation due to ignoring instruction will cause harm or damage. - Page 5 Safety Precautions Do not modify or extend the Do not let the air conditioner Be cautious when unpacking power cable. run for a long time when the and installing the product. humidity is very high and a door or a window is left open. •...
- Page 6 Safety Precautions n Installation Always check for gas (refriger- Install the drain hose to ensure Keep level even when installing ant) leakage after installation or that water is drained away prop- the product. repair of product. erly. • Low refrigerant levels may cause •...
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Page 7: Introduction
Introduction Introduction Symbols Used in this Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that could cause harm to the air conditioner. This symbol indicates special notes. NOTICE Features Low static Duct type Air outlet vents Air filters Wired Remote Controller... -
Page 8: Installation
Installation Installation Selection of the best location Indoor unit Top view Install the air conditioner in the location that satisfies the fol- Inspection hole [Unit : mm(inch)] lowing conditions. [600(23-5/8) x 600(23-5/8)] Control box • The place shall easily bear a load exceeding four times the indoor unitʼs weight. -
Page 9: Ceiling Opening Dimension And Hanging Bolt Location
Installation Ceiling dimension and hanging bolt location Installation of Unit Install the unit above the ceiling correctly. CASE 1 POSITION OF SUSPENSION BOLT • Apply a joint-canvas between the unit and duct to absorb unnecessary vibration. • Apply a filter Accessory at air return hole. [Unit: mm(inch)] Dimension Chassis... -
Page 10: Indoor Unit Installation
Installation Indoor Unit Installation • Select and mark the position for fixing bolts. • Insert the set anchor and washer onto the suspen- • Drill the hole for set anchor on the face of ceiling. sion bolts for locking the suspension bolts on the ceiling. -
Page 11: Part Name And Functions
Installation Part name and functions Air Filter Panel Rear Air outlet Panel Rear Air outlet Air Filter • Low static duct type in case of suction from back • Low static duct type in case of suction from bottom side. side. -
Page 12: Checking The Drainage
Installation INSULATION, OTHERS Insulate the joint and tubes completely. THERMAL INSULATION All thermal insulation must comply with local requirement. INDOOR UNIT Union for gas pipe Thermal insulator for refrigerant pipe Refrigerant pipe and thermal (Local supply) Thermal insulator for insulator(Local supply) piping(Local supply) Hose clip for thermal insulator (Local supply) -
Page 13: Drain Piping
Installation CAUTION 1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner. 2. Minimum thickness of the insulation for the connecting pipe shall be 19mm. Front of view • The unit must be horizontal or declined to the drain hose connected when finished installation. -
Page 14: Hand Over
Installation CAUTION : The supplied flexible drain Flexible drain hose Flexible drain hose Flexible drain hose hose should not be curved, neither 1/50~1/100 screwed. The curved or screwed hose MAX 700mm may cause a leakage of water. (27-9/16 inch) CAUTION: After the confirmation of the above conditions, prepare the wiring as follows: 1) Never fail to have an individual power specialized for the air conditioner. - Page 15 Installation WIERED REMOTE CONTROLLER INSTALLATION • Since the room temperature sensor is in the remote controller, the remote controller box should be installed in a place away from direct sunlight, high humidity and direct supply of cold air to maintain proper space temperature. Install the remote controller about 5ft(1.5m) above the floor in an area with good air circulation at an average tempera- ture.
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Page 16: Installation Of Wired Remote Controller
Installation Installation of Wired Remote Controller 1. Please fix tightly using provided screw after placing remote controller setup board on the place where you like to setup. - Please set it up not to bend because poor setup could take place if setup board bends. Please set up remote controller board fit to the reclamation box if there is a reclamation box. - Page 17 Installation 4. Please connect indoor unit and remote controller using connection cable. Please check if connector is normally connected. Indoor Unit side Connecting cable 5. Please use extension cable if the distance between wired remote controller and indoor unit is more than 10m.
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Page 18: Name And Function Of Wired Remote Controller(Accessory).18
Installation Name and function of wired remote controller(Accessory) 1. Operation indication screen 2. Set temperature button • It will set not room temperature but outlet air temperature. 3. Fan speed button • Fan Speed have 3 Steps. • Middle and Low step is same 4. -
Page 19: Dip Switch Setting Of Indoor Unit Pcb
Installation Dip Switch Setting of Indoor unit PCB Function Description Setting Off Setting On Default Communication N/A (Default) Cycle N/A (Default) Group Control Selection of Master or Slave Master Slave Dry Contact Mode Selection of Dry Contact Wired/Wireless remote Mode controller Auto Selection of Manual or Auto... -
Page 20: Group Control Setting
Installation Group Control Setting 1. Group Control 1 n Wired remote controller 1 + Indoor units LGAP Network System Slave Master Slave Signal Slave 12 V Display Error Message Only connect serial signal and GND lines between slave indoor unit Master n Dip Switch in PCB (Cassette and Duct Type indoor units) Master Setting... -
Page 21: Group Control
Installation 5. In case of any error occurs at indoor unit, display on the wired remote controller. Exception of the error indoor unit, an individual indoor unit control possibility. 6. In case of Group Control, it is possible to use following functions. - Selection of operation options (operation/stop/mode/set temperature) - Control of flow rate (High/Middle/Low) - It is not possible at some functions. - Page 22 Installation 3. Group Control 3 n Mixture connection with indoor units and Fresh Air Intake Unit LGAP Network System Signal Master Slave Master Slave 12 V Display Error Message Master Master h In case of connecting with standard indoor unit and Fresh Intake Unit, separate Fresh Air Intake Unit with standard units.
- Page 23 Installation 4. 2 Remote Control n Wired remote controller 2 + Indoor unit 1 LGAP Network System Master Display Error Message Master Slave 1. It is possible to connect two wired remote controllers with one indoor unit. 2. Every types of indoor unit is possible to connect two remote controller. 3.
- Page 24 Installation 5. Accessories for group control setting It is possible to set group control by using below accessories. Indoor unit 2 EA +Wired remote controller Indoor unit 1 EA +Wired remote controller 2EA h PZCWRCG3 cable used for connection h PZCWRC2 cable used for connection S lave Mas te r PZC WRC 2...
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Page 25: How To Set E.s.p
How to Set E.S.P? How to Set E.S.P? This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier. • If you set ESP incorrectly, the air conditioner may malfunction. •... - Page 26 How to Set E.S.P? Select ESP fan step again by using button and setup ESP value, as No. 4 and 5, that corresponds each wind flow Press button to save. Press button to exit. ❈ After setup, it automatically gets out of setup mode if there is no button input for 25 seconds.
- Page 27 How to Set E.S.P? ARNU073B1G2, ARNU093B1G2, ARNU123B1G2, ARNU153B1G2 (Unit;cmm(cfm)) Static Pressure(mmAq (in.Aq)) Setting Value 0(0) 1(3.93) 2(7.87) 3(0.11) 4(0.15) 6.02(212) 2.25(79) 0.61(21) 6.95(245) 3.32(117) 0.73(25) 0.54(19) 0.48(16) 7.69(271) 5.16(182) 1.19(42) 0.65(22) 0.56(19) 84.6(298) 6.93(244) 2.42(85) 0.77(27) 0.63(22) 9.5(335) 7.37(260) 3.4(120) 0.87(30) 0.72(25) 10.35(365)
- Page 28 Indoor Unit...