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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 : AHU EXPANSION KIT
Models : PATX13A0E
PATX35A0E PATX50A0E
P/NO : MFL62049603
PATX20A0E PATX25A0E
www.lg.com
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Table of Contents
Related Manuals for LG PATX20A0E
Summary of Contents for LG PATX20A0E
- 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. TYPE : AHU EXPANSION KIT Models : PATX13A0E PATX20A0E PATX25A0E PATX35A0E PATX50A0E www.lg.com P/NO : MFL62049603...
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Page 2: Table Of Contents
AHU EXPANSION KIT Installation Manual TABLE OF CONTENTS Safety Precautions.............3 Installation Scene...............5 Supplies................6 EXPANSION KIT Installation ..........7 n Mechanical installation ................7 n Brazing work .....................10 n Pipe cutting work ..................11 n Thermistor connection................12 n Leakage and vacuum test ..........15 n Leakage test.....................15 n Vacuum test....................15 n Superheat Adjustment...............16 n EXPANSION KIT installation confirmation plate preparation ...17... -
Page 3: 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 Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. WARNING This symbol indicates the possibility of death or serious injury. - Page 4 Safety Precautions n Operation Make sure that water does When the air conditioner is Do not keep any heating not get inside the product submersed in water, always devices near the product. (Controller). Especially, do consult MULTI not clean the product with installation service provider.
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Page 5: Installation Scene
Refrigerant flow (Heating) Installation components Name Remarks ① Air Handling Unit Connectable outdoor unit capacity PATX13A0E 8 ~ 16 HP PATX20A0E 18 ~ 26 HP ② EXPANSION KIT PATX25A0E 28 ~ 36 HP PATX35A0E 38 ~ 46 HP PATX50A0E 48 ~ 56 HP ③... -
Page 6: Supplies
- Pipe diameter (mm) ① ② :28.58 ③ : 22.2 - Norminal capacity : 20RT ④ : 15.88 PATX20A0E - Applied Outdoor unit - Flow rate : 37l /min - L1 x L2 x W x H(mm) : 491 x 331 x 238 x 174 capacity : 18~26HP - Weight (NET/GROSS, kg): 5.8/7.1... -
Page 7: Expansion Kit Installation
EXPANSION KIT Installation EXPANSION KIT Installation Mechanical installation 1. Unscrew the 4 screws on the side cover of EXPANSION KIT. 2. Disassemble the side cover. 3. Unscrew the 2 screws on the top cover. 4. Disassemble the top cover. 5. Check the location and direction to install EXPANSION KIT on the AHU. - Page 8 EXPANSION KIT Installation CAUTION Gas pipe Gas pipe n You must install the Expansion Kit exactly as Header shown in the above diagram. Otherwise, it will Liquid pipe cause failure. (Do not install with the header Liquid pipe directing downward.) Installation location of EXPANSION KIT Right side Left side...
- Page 9 EXPANSION KIT Installation 6. Use the installation component 90° elbow to connect AHU and EXPANSION KIT. 7. Use the installation screw to tighten 4 locations of the AHU casing and EXPANSION KIT. 8. Weld 4 connecting locations of AHU heat exchanger pipe and 90°...
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Page 10: Brazing Work
EXPANSION KIT Installation Brazing work CAUTION n Be sure to carry out a nitrogen blow when brazing. Brazing without carrying out nitrogen replacement or releasing nitrogen into the piping will create large quantities of oxidized film on the inside of the pipes, adversely affecting valves and compressors in the refrigerating system and preventing normal operation. -
Page 11: Pipe Cutting Work
EXPANSION KIT Installation Pipe cutting work 1. Always use the copper pipe cutter when cutting the pipe. Copper pipe cutter CAUTION Tilted Rough n Always cut in a straight line for the cut part. Pipe 2. Always remove the burr. (Keep the end of the pipe facing down during the work and make sure that the burr does not get inside the pipe.) Pipe... -
Page 12: Thermistor Connection
EXPANSION KIT Installation Thermistor connection 1. Insert the Thermistor IN/OUT to the correct location on the sensor holder. Sensor holder 2. Set the same inserting location of the Thermistor as shown in the picture. Thermistor 3. Insert the Thermistor so that it is inserted to Thermistor the end of the sensor holder. - Page 13 EXPANSION KIT Installation [COMMUNICATION PCB CONFIGURATION] Thermistor #A IN Thermistor #B OUT Thermistor #B IN Thermistor #A OUT Outdoor unit communication line #B Rotary switch #A Rotary switch #B Outdoor unit communication line #A 10. Distinguish and connect the IN and OUT on the Thermistor terminal on the communication PCB inside AHU CONTROL KIT.
- Page 14 EXPANSION KIT Installation [INSTALLATION CONFIGURATION EXAMPLE] A (Outdoor unit 1) Liquid pipe Gas pipe Refrigerant flow direction Thermistor based on cooling B (Outdoor unit 2) Liquid pipe [AHU control box] Gas pipe Refrigerant flow direction Thermistor based on cooling AHU Controller Communication PCB Refrigerant pipe AHU communication line...
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Page 15: Leakage And Vacuum Test
Leakage and vacuum test Leakage and vacuum test Leakage test Execute the leakage test in the same criteria as MULTI leakage test. Leakage test is done by apply nitrogen gas at 3.8MPa (38.7kgf/cm ). Refer to the following picture for the test method. (Test with the service valve closed and pressurize the liquid and gas pipe.) After the nitrogen gas is pressurized, the pressure must not drop for 24 hours. -
Page 16: Superheat Adjustment
Leakage and vacuum test - Add the accurate amount of refrigerant after the calculation. - If the amount of refrigerant is not accurate, it can cause problems to the product. - If the additionally inserted amount of refrigerant exceeds ±10%, the compressor can be burnt and the indoor unit can underperform. -
Page 17: Expansion Kit Installation Confirmation Plate Preparation
Gas pipe: 22.22 / Liquid pipe: 15.88 pipe size (mm) Outdoor unit side Gas pipe: 22.22 / Liquid pipe: 15.88 Site name Site name PATX13A0E PATX20A0E Model name Model name EXPANSION EXPANSION 8 ~ 16 HP 18 ~ 26 HP... - Page 18 18 AHU EXPANSION KIT...