LG KSUDA181A Engineering Manual
LG KSUDA181A Engineering Manual

LG KSUDA181A Engineering Manual

R32 single-zone four-way cassette with lgred

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R32 SINGLE-ZONE
FOUR-WAY CASSETTE
WITH
ENGINEERING MANUAL
KSUDA181A (18,000 Btu/h)
KSSCA241A (24,000 Btu/h)
KSSCA301A (30,000 Btu/h)
KSSCA361A (36,000 Btu/h)
KSSCA421A (42,000 Btu/h)
KSSCA481A (48,000 Btu/h)

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  • Page 1 R32 SINGLE-ZONE FOUR-WAY CASSETTE WITH ENGINEERING MANUAL KSUDA181A (18,000 Btu/h) KSSCA241A (24,000 Btu/h) KSSCA301A (30,000 Btu/h) KSSCA361A (36,000 Btu/h) KSSCA421A (42,000 Btu/h) KSSCA481A (48,000 Btu/h)
  • Page 2: Proprietary Data Notice

    For continual product development, LG Electronics U.S.A., Inc., reserves the right to change specifications without notice. © LG Electronics U.S.A., Inc. This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.
  • Page 3: Lg Air Conditioner Technical Solution

    ® is a registered mark of Microsoft® Corporation. LATS Revit integrates the LG LATS program with Revit® software**. It permits engineers to layout and validate LG VRF, Multi F / Multi F MAX, Single-Zone, and DOAS directly into Revit drawings.
  • Page 4: Lg Air Conditioner Technical Solution (Lats)

    LATS can generate an Excel GERP report that can be imported into the LG SOPS pricing and ordering system.
  • Page 5: Table Of Contents

    TABLE OF CONTENTS LG Air Conditioner Technical Solution ..................................3 Table of Symbols ..........................................6 Product Data ..........................................7-36 Nomenclature ........................................... 8 Pairing Table ............................................. 9 ......................................10-12 General Data ..........................................13-18 Electrical Data ..........................................19 Functions, Controls, Options ..................................... 20-21 Accessories ..........................................
  • Page 6: Table Of Symbols

    TABLE OF SYMBOLS DANGER Indicates a hazardous situation that, if not avoided, WILL RESULT IN DEATH OR SERIOUS INJURY. Indicates a hazardous situation that, if not avoided, COULD RESULT IN DEATH OR SERIOUS INJURY. CAUTION Indicates a hazardous situation that, if not avoided, COULD RESULT IN MINOR OR MODERATE INJURY. Indicates information considered important, but not hazard-related;...
  • Page 7: Product Data

    PRODUCT DATA Nomenclature on page 8 Pairing Table on Page 9 Mechanical Specifications on page 10 General Data on page 13 Electrical Data on page 19 Functions, Controls, and Options on page 20 Accessories on page 22 Outdoor Unit Dimensions on page 25 Indoor Unit Dimensions on page 28 Air Flow, Temperature Distribution Graphs on page 31 Acoustic Data on page 33...
  • Page 8: Nomenclature

    UNIT NOMENCLATURE 1. Refrigerant K = R32 2. Component N = Indoor Unit S = System U = Outdoor Unit 3. Product Category S = Single U = Universal 4. Product Type C = Four-Way Cassette D = Four-Way Cassette (Mini) 5.
  • Page 9: Pairing Table

    PAIRING TABLE The following table shows the available outdoor and indoor unit, along with the factory provided controller. Table 1: R32 Single Zone LGRED Four-Way Ceiling Cassette System Pairing Table Outdoor Unit Model Indoor Unit Model Controller KUSXA181A KNUDB181A PQWRHQ0FDB KUSXA241A KNSCB241A PWLSSB21H...
  • Page 10: Mechanical Specifications

    Standard for Safety and bear the CSA label. Wiring in these units via 18 AWG, two-conductor, are in accordance with the national Electrical Code (NEC). LG single stranded, shielded or zone four-way ceiling cassette systems have published performance...
  • Page 11: Sound Levels

    MECHANICAL SPECIFICATIONS Coil Coil Figure 3: Four-Way 18,000 Btu/h 2x2 Ceiling Cassette System (KSUDA181A). Heat pump outdoor unit coils are made of nonferrous louvered Indoor unit coils are aluminum fins protected with an integral coil guard. The coil for each factory built and are outdoor unit has a minimum of 14 fins per inch (FPI);...
  • Page 12 Units The indoor units are Wi-Fi compatible with the addition of an LG Wi- The case has a factory designated cutout for the connection of a Fi module accessory, and can be controlled by LG’s ThinQ™ app on field-supplied outside air duct.
  • Page 13: General Data

    Sound Pressure levels are tested in an anechoic chamber under ISO Standard 3745. Due to our policy of continuous product innovation, some specifications may change without notification. © LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG ” is a registered trademark of LG Corp.
  • Page 14 (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB). Due to our policy of continuous product innovation, some specifications may change without notification. © LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG ” is a registered trademark of LG Corp.
  • Page 15 GENERAL DATA Table 4: KSSCA241A KSSCA301A KSSCA361A System (Model) (Indoor Unit / Outdoor Unit) (KNSCB241A / KUSXA241A) (KNSCB301A / KUSXA301A) (KNSCB361A / KUSXA361A) Grille Model No. PT-AAGW0 PT-AAGW0 PT-AAGW0 Cooling Capacity (Min/Rated/Max) (Btu/h) 9,600 ~ 24,000 ~ 30,000 12,000 ~ 30,000 ~ 36,000 14,400 ~ 36,000 ~ 44,000 Cooling Power Input (Min/Rated/Max) (kW)
  • Page 16 GENERAL DATA Table 5: KSSCA241A KSSCA301A KSSCA361A System (Model) (Indoor Unit / Outdoor Unit) (KNSCB241A / KUSXA241A) (KNSCB301A / KUSXA301A) (KNSCB361A / KUSXA361A) Outdoor Unit Data Cooling (°F DB) 5 to 118 Operating Range Heating (°F WB) -13 to +64 Cooling Sound Pressure dB(A)
  • Page 17 GENERAL DATA Table 6: System (Model) (Indoor Unit / Outdoor Unit) KSSCA421A (KNSCB421A / KUSXA421A) KSSCA481A (KNSCB481A / KUSXA481A) Grille Model No. PT-AAGW0 PT-AAGW0 Cooling Capacity (Min/Rated/Max) (Btu/h) 16,800 ~ 42,000 ~ 49,000 19,200 ~ 48,000 ~ 55,000 Cooling Power Input (Min/Rated/Max) (kW) 0.93 ~ 3.11 ~ 5.50 1.09 ~ 3.78 ~ 5.82...
  • Page 18 GENERAL DATA Table 7: KSSCA421A KSSCA481A ( System (Model) (Indoor Unit / Outdoor Unit) (KNSCB421A / KUSXA421A) KNSCB481A / KUSXA481A) Outdoor Unit Data Cooling (°F DB) 5 to 118 Operating Range Heating (°F WB) -13 to +64 Cooling Sound Pressure dB(A) Heating Max.
  • Page 19: Electrical Data

    Unit Model No. Hertz Voltage MCA MOP Motor RLA Condenser Tons Quantity Fan Motor (Cooling) Fan Qty. 2x2 Cassette 1-1/2 KSUDA181A 208 - 230 187 - 253 19.1 3x3 Cassette KSSCA241A 19.1 2-1/2 KSSCA301A 32.0 1.6 x 2 KSSCA361A 32.0 1.6 x 2...
  • Page 20: Functions, Controls, Options

    Wi-Fi Group Control Wire Primary washable filter. 14”x14”x1” for 2x2 units; 20.5”x20.5”x1” for 3x3 units. Not all controllers can support all features. Contact your LG representative for details. O: Option. Optional accessories must be Requires connected wired controller for operation.
  • Page 21 LonWorks® Gateway AHU Communications Kit Not all controllers can support all features. Contact your LG representative for details. O: Option. Optional accessories must be purchased separately. BACnet® is a registered trademark of ASHRAE. LonWorks is a registered trademark of Echelon Corp.
  • Page 22: Accessories

    ACCESSORIES Accessories Table Table 11: Accessories Overview. (Sold Separately) Accessory Model Number PT-QAGW0 Standard Panel — White (One Required) PT-AAGW0 Premium Panel (Includes Panel PT-AFGW0 + Air Purification Kit PTAHMP0) PT-AFGW0S Air Purification Kit (Only Available with Premium Panel PTAFGW0S) PTAHMP0 Cassette Decorative Cover PTDCA...
  • Page 23 ACCESSORIES LG Monitoring View (LGMV) Diagnostic Software and Cable LG Monitoring View (LGMV) is a maintenance and troubleshooting tool for Multi V™ air conditioning systems. LGMV formats are available for computer or mobile phone use. The main screen for LGMV allows the user to view the following real time data: •...
  • Page 24 Figure 5: Example of an LG Smart ThinQ Screen (appearanc- LG ThinQ is a built-in Wi-Fi module, along with a free smart phone app that provides monitoring and es my differ depending on version remote control capabilities for certain LG single zone systems. The app has the following features and of software).
  • Page 25: Outdoor Unit Dimensions

    OUTDOOR UNIT DIMENSIONS KUSXA181A , KUSXA241A Figure 6: KUSXA181A , KUSXA241A Outdoor Unit Dimensions. ©...
  • Page 26 OUTDOOR UNIT DIMENSIONS KUSXA301A, KUSXA361A, KUSXA421A, KUSXA481A Figure 7: KUSXA301A, KUSXA361A, KUSXA421A, KUSXA481A Outdoor Unit Dimensions. ©...
  • Page 27: Outdoor Unit Center Of Gravity / Corner Weight

    81.8 • Design features and information of outdoor unit may be changed without notifications due to LG’s policy of innovation. • The center of gravity and corner weight may be different from the actual values because these are simulation results.
  • Page 28: Indoor Unit Dimensions

    INDOOR UNIT DIMENSIONS KNUDB181A Figure 9: KNUDB181A 2x2 Indoor Unit Dimensions. 3-37/64 1-11/32 1-11/32 1-61/64 1-61/64 Maximum Condensate Lift: 27-9/16 3-37/64 3-37/64 ©...
  • Page 29 INDOOR UNIT DIMENSIONS KNSCB241A Figure 10: KNSCB241A 3x3 Indoor Unit Dimensions. ©...
  • Page 30 INDOOR UNIT DIMENSIONS KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A Figure 11: KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A 3x3 Indoor Unit Dimensions. ©...
  • Page 31: Air Flow, Temp. Distribution Graphs

    AIR FLOW Indoor Unit Air Flow / Temperature Distribution Figure 12: KNUDB181A Air Velocity and Temperature Distribution Charts. Figure 13: KNSCB241A Air Velocity and Temperature Distribution Charts. Cooling Heating Discharge angle: Outer - 30°, Inner - 67° Discharge angle: Outer - 36°, Inner - 70° Air velocity [ft/s] Air velocity [ft/s] 8.9 ft...
  • Page 32 AIR FLOW Indoor Unit Air Flow / Temperature Distribution Figure 14: KNSCB301A, KNSCB361A Air Velocity and Temperature Distribution Charts. Cooling Heating Discharge angle: Outer - 30°, Inner - 67° Discharge angle: Outer - 36°, Inner - 70° Air velocity [ft/s] Air velocity [ft/s] 10.5 ft 10.5 ft...
  • Page 33: Acoustic Data

    ACOUSTIC DATA Sound Pressure for Outdoor Units Figure 16: LGRED Four-Way Cassette Outdoor Unit • Measurements taken with no attenuation and units operating at full load normal operating condition. Sound Pressure Level Measurement Location (For Illustrative Purposes Only; Appearance Depends on •...
  • Page 34 ACOUSTIC DATA Sound Power for Outdoor Units Table 14: LGRED Four-Way Ceiling Cassette Outdoor Unit Sound Power Levels (dB[A]). • Data is valid under diffuse field conditions. Model Sound Power Levels (dB[A]) • Data is valid under nominal operating conditions. KUSXA181A KUSXA241A •...
  • Page 35 ACOUSTIC DATA Sound Pressure for Indoor Units Figure 19: LGRED Four-Way Cassette Indoor Unit • Measurements taken with no attenuation and units operating at full load normal Sound Pressure Level Measurement Location. operating condition. • Measurements are taken 4.9 ft. away from the front of the unit. •...
  • Page 36 ACOUSTIC DATA Sound Power for Indoor Units Table 16: LGRED Four-Way Cassette Indoor Unit Sound Power Levels (dB[A]). Sound Power Levels (dB[A]) • Data is valid under diffuse field conditions. Model • Data is valid under nominal operating conditions. KNUDB181A •...
  • Page 37: Performance Data

    PERFORMANCE DATA Cooling Capacity on page 38 Maximum Cooling Capacity on page 44 Heating Capacity on page 50 Maximum Heating Capacity on page 56 Correction Factors on page 62...
  • Page 38: Cooling Capacity

    COOLING CAPACITY KSUDA181A (KNUDB181A / KUSXA181A) Table 17: KSUDA181A (KNUDB181A / KUSXA181A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB)
  • Page 39 COOLING CAPACITY KSSCA241A (KNSCB241A / KUSXA241A) Table 18: KSSCA241A (KNSCB241A / KUSXA241A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 23.6...
  • Page 40 COOLING CAPACITY KSSCA301A (KNSCB301A / KUSXA301A) Table 19: KSSCA301A (KNSCB301A / KUSXA301A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 29.50 22.64...
  • Page 41 COOLING CAPACITY KSSCA361A (KNSCB361A / KUSXA361A) Table 20: KSSCA361A (KNSCB361A / KUSXA361A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 35.40 25.55...
  • Page 42 COOLING CAPACITY KSSCA421A (KNSCB421A / KUSXA421A) Table 21: KSSCA421A (KNSCB421A / KUSXA421A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 41.30 30.60...
  • Page 43 COOLING CAPACITY KSSCA481A (KNSCB481A / KUSXA481A) Table 22: KSSCA481A (KNSCB481A / KUSXA481A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 47.20 33.56...
  • Page 44: Maximum Cooling Capacity

    MAXIMUM COOLING CAPACITY KSUDA181A (KNUDB181A / KUSXA181A) Table 23: KSUDA181A (KNUDB181A / KUSXA181A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB)
  • Page 45 MAXIMUM COOLING CAPACITY KSSCA241A (KNSCB241A / KUSXA241A) Table 24: KSSCA241A (KNSCB241A / KUSXA241A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 29.49 19.47...
  • Page 46 MAXIMUM COOLING CAPACITY KSSCA301A (KNSCB301A / KUSXA301A) Table 25: KSSCA301A (KNSCB301A / KUSXA301A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 35.39 27.17...
  • Page 47 MAXIMUM COOLING CAPACITY Table 27: KSSCA361A (KNSCB361A / KUSXA361A) Table 26: KSSCA361A (KNSCB361A / KUSXA361A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB)
  • Page 48 MAXIMUM COOLING CAPACITY KSSCA421A (KNSCB421A / KUSXA421A) Table 28: KSSCA421A (KNSCB421A / KUSXA421A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 48.17 35.71...
  • Page 49 MAXIMUM COOLING CAPACITY KSSCA481A (KNSCB481A / KUSXA481A) Table 29: KSSCA481A (KNSCB481A / KUSXA481A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air Temp. 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 (°F DB) 54.07 38.46...
  • Page 50: Heating Capacity

    HEATING CAPACITY KSUDA181A (KNUDB181A / KUSXA181A) Table 30: KSUDA181A (KNUDB181A / KUSXA181A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 1.06 1.09 1.13 1.14 1.15 1.19 -4.4 10.2 1.14 1.17 1.20 1.23 1.24 1.27...
  • Page 51 HEATING CAPACITY KSSCA241A (KNSCB241A / KUSXA241A) Table 31: KSSCA241A (KNSCB241A / KUSXA241A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 1.27 1.31 1.35 1.37 1.38 1.43 -4.4 11.0 1.37 10.2 1.40 10.2 1.45 10.1 1.47 10.0...
  • Page 52 HEATING CAPACITY KSSCA301A (KNSCB301A / KUSXA301A) Table 32: KSSCA301A (KNSCB301A / KUSXA301A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 11.4 1.51 10.2 1.55 10.4 1.60 10.3 1.63 10.2 1.64 1.69 -4.4 15.3 1.61 14.3 1.67...
  • Page 53 HEATING CAPACITY KSSCA361A (KNSCB361A / KUSXA361A) Table 33: KSSCA361A (KNSCB361A / KUSXA361A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 13.84 1.83 12.43 1.88 12.61 1.94 12.52 1.98 12.45 1.99 11.83 2.06 -4.4 18.58 1.96 17.34...
  • Page 54 HEATING CAPACITY KSSCA421A (KNSCB421A / KUSXA421A) Table 34: KSSCA421A (KNSCB421A / KUSXA421A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 15.96 2.01 14.33 2.06 14.54 2.13 14.44 2.16 14.35 2.18 13.64 2.25 -4.4 21.42 2.15 20.00...
  • Page 55 HEATING CAPACITY KSSCA481A (KNSCB481A / KUSXA481A) Table 35: KSSCA481A (KNSCB481A / KUSXA481A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 17.7 2.30 15.9 2.36 16.2 2.44 16.1 2.48 16.0 2.50 15.2 2.58 -4.4 23.8 2.46 22.2...
  • Page 56: Maximum Heating Capacity

    MAXIMUM HEATING CAPACITY KSUDA181A (KNUDB181A / KUSXA181A) Table 36: KSUDA181A (KNUDB181A / KUSXA181A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 16.6 2.40 16.2 2.48 15.8 2.56 15.5 2.60 15.3 2.64 14.7 2.72...
  • Page 57 MAXIMUM HEATING CAPACITY KSSCA241A (KNSCB241A / KUSXA241A) Table 37: KSSCA241A (KNSCB241A / KUSXA241A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 23.1 3.63 22.6 3.75 22.0 3.87 21.6 3.94 21.3 3.99 20.6 4.11 -4.4 26.5...
  • Page 58 MAXIMUM HEATING CAPACITY KSSCA301A (KNSCB301A / KUSXA301A) Table 38: KSSCA301A (KNSCB301A / KUSXA301A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 30.25 4.29 29.58 4.43 28.73 4.57 28.25 4.65 27.88 4.71 26.87 4.86 -4.4 32.13...
  • Page 59 MAXIMUM HEATING CAPACITY KSSCA361A (KNSCB361A / KUSXA361A) Table 39: KSSCA361A (KNSCB361A / KUSXA361A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 32.12 4.70 31.41 4.86 30.51 5.02 30.00 5.10 29.61 5.17 28.54 5.33 -4.4 38.02...
  • Page 60 MAXIMUM HEATING CAPACITY KSSCA421A (KNSCB421A / KUSXA421A) Table 40: KSSCA421A (KNSCB421A / KUSXA421A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 38.65 5.73 37.79 5.92 36.71 6.11 36.10 6.21 35.63 6.30 34.34 6.49 -4.4 41.98...
  • Page 61 MAXIMUM HEATING CAPACITY KSSCA481A (KNSCB481A / KUSXA481A) Table 41: KSSCA481A (KNSCB481A / KUSXA481A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -13.4 40.58 6.01 39.68 6.21 38.54 6.41 37.90 6.52 37.40 6.61 36.05 6.81 -4.4 44.08...
  • Page 62: Correction Factors

    Table 42: Piping Length (ft.) 24.6 32.8 49.2 65.6 98.4 131.2 196.9 229.7 Cooling Capacity Coefficient Factor KSUDA181A (18,000 Btu/h) 98.1 96.1 94.3 92.1 KSSCA241A (24,000 Btu/h) 98.1 96.1 94.3 92.1 KSSCA301A (30,000 Btu/h) 98.1 96.1...
  • Page 63: Check Selection

    • Verify that the sensible load of the zone is satisfied. • Use caution when sizing to meet listed capacity specifications for the scheduled manufacturer’s equipment. If further system design assistance is needed, or you have a unique application you would like to discuss, contact an LG sales rep. ©...
  • Page 64: Application Guidelines

    APPLICATION GUIDELINES...
  • Page 65: Indoor Unit Placement / Clearance Considerations

    CONSIDERATIONS Indoor Units Selecting the Best Location for the Indoor Unit Figure 22: Cassette Indoor Unit Clearance Requirements. Follow recommended best practices when choosing an indoor location Ceiling for the single zone indoor unit. 13/32 or more Select a location for installing the indoor units that will meet the following Ceiling Board Ceiling Board Ceiling Cassette...
  • Page 66 CONSIDERATIONS Indoor Units explosion, and physical injury or death. • environment where the IDUs are installed, proper air make up or supply and / or adequate ventilation should be provided. Additionally, in • If the unit is installed near a body of water, the installation parts are at risk of corroding. Appropriate anti-corrosion methods must be taken for the unit and all installation parts.
  • Page 67: Outdoor Unit Placement / Clearance Considerations

    CONSIDERATIONS Outdoor Units Selecting the Best Location for the Outdoor Unit DANGER • Do not install the unit in an area where combustible gas will generate, flow, stagnate, or leak. These conditions can cause a fire, result- ing in bodily injury or death. •...
  • Page 68: Planning For Snow And Ice

    CONSIDERATIONS Outdoor Units Planning for Snow and Ice To ensure the outdoor unit operates properly, certain measures are required in locations where there is a possibility of heavy snowfall or severe windchill or cold: 1. Prepare for severe winter wind chills and heavy snowfall, even in areas of the country where these are unusual phenomena. 2.
  • Page 69: Oceanside Applications

    CONSIDERATIONS Outdoor Units Oceanside Applications Figure 27: Prevailing Wind Direc- Figure 28: Leeward Side of the tion. Building. Wind Protection If the outdoor unit is placed on a roof, position it with the compressor end (no coil surface) in the direction of the prevailing wind as shown in the figure at right.
  • Page 70 CONSIDERATIONS Outdoor Units Proper clearance for the outdoor unit coil is critical for proper unit operation. When installing the outdoor unit, consider service, inlet and outlet and minimum allowable space requirements as illustrated in the diagrams on the following pages. •...
  • Page 71 CONSIDERATIONS Outdoor Units Minimum Clearance Requirements for Dual Fan Outdoor Units Figures below and on the next page illustrate clearance requirements for various installation scenarios for dual fan outdoor units. Use the hot isle / cold isle approach when placing multiple units in close proximity to each other. Outdoor unit fans draw air from the back of the unit and discharges out the front.
  • Page 72 CONSIDERATIONS Outdoor Units Minimum Clearance Requirements for Dual Fan Outdoor Units, Continued. • Installation clearances must comply with local building codes. • All figures not to scale. Figure 35: Proper Outdoor Unit Placement and Clearances When There Are Obstacles on the Suction and the Discharge Sides. When Obstacle Height of the Discharge Side is Higher than the Outdoor Unit.
  • Page 73: Installing Outdoor Units Indoors

    INSTALLING OUTDOOR UNITS INDOORS Installing Outdoor Units Indoors Single Zone outdoor units are engineered to be mounted outdoors and include technology designed to minimize the negative effects of winter weather’s freezing rain, sleet, and snow. Some building projects, however, necessitate placing the HVAC outdoor units indoors: •...
  • Page 74 INSTALLING OUTDOOR UNITS INDOORS Provide a means to drain the condensate generated during heating mode and defrost cycle in addition to rainwater that infiltrates the inlet louver enclosed area. • Install a field-provided drain pan under the outdoor units and provide a path to a nearby floor drain. •...
  • Page 75 INSTALLING OUTDOOR UNITS INDOORS Open Rate by Louver Radian Figure 37: Open Rate by Louver Radian Formula. ho = h * COS Total Area (A) = H * W Number of Open Spaces (N) = (Number of Louvers - 1) Effective Area (Af) = ho * W * N Louver Open Rate (n) = Af / A Af = A * n...
  • Page 76: Refrigerant Piping Design

    REFRIGERANT PIPING DESIGN Connection Limitations and System Layout on page 81 Additional Refrigerant Charge on page 82 Refrigerant Piping System Engineering on page 83...
  • Page 77: Refrigerant Flow Diagrams

    REFRIGERANT FLOW DIAGRAMS KUSXA181A, KUSXA241A, KUSXA301A, KUSXA361A Outdoor Units Figure 39: KUSXA181A, KUSXA241A, KUSXA301A, KUSXA361A Outdoor Unit Refrigerant Flow Diagram. Condenser Outlet Pipe Temperature Thermistor Condenser Middle Pipe Temperature Thermistor Ø3/8 Inch Liquid Side 18,000 and 24,000 Piping Btu/h Outdoor Units have one (1) fan.
  • Page 78 REFRIGERANT FLOW DIAGRAMS KUSXA421A, KUSXA481A Outdoor Units Figure 40: KUSXA421A, KUSXA481A Outdoor Unit Refrigerant Flow Diagram. High Pressure Switch Table 52: KUSXA421A, KUSXA481A Outdoor Unit Thermistor Details. Description PCB Connector Discharge Pipe Temperature Thermistor CN6_BK Suction Pipe Temperature Thermistor CN5_GN Condenser Outlet Pipe Temperature Thermistor CN7_VI Air Temperature Thermistor...
  • Page 79: Turbo Fan

    REFRIGERANT FLOW DIAGRAMS KNUDB181A Indoor Units Figure 42: KNUDB181A Indoor Unit Refrigerant Flow Diagram. Gas pipe connection port Heat exchanger (flare connection) Heating Evaporator Outlet Cooling Turbo fan Temperature Thermistor Indoor Air Temperature Thermistor Evaporator Inlet Temperature Thermistor Liquid pipe connection port (flare connection) Table 53: KNUDB181A Indoor Unit Thermistor Details.
  • Page 80 REFRIGERANT FLOW DIAGRAMS KNSCB241A, KNSCB301A, KNSCB361A Indoor Units Figure 43: KNSCB241A, KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A Refrigerant Flow Diagram. : Cooling : Heating (3D Turbo Fan) Table 56: KNSCB241A, KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A Indoor Unit Thermistor Details. Thermistor Description (Based on Cooling Mode) PCB Connector Suction Indoor Air Temperature Thermistor CN_ROOM...
  • Page 81: Connection Limitations And System Layout

    Measured in Actual Feet) Additional Refrigerant Needed (oz. /ft.) 0.38 0.38 0.43 System Layout Figure 44: Typical KSUDA181A, KSSCA241A, KSSCA301A System Figure 45: Typical KSSCA361A, KSSCA421A, KSSCA481A System Layout. Layout. Unit = Feet Unit = Feet Max Length = A...
  • Page 82: Additional Refrigerant Charge

    System Model No. Charge add’l refrig., 16.4 24.6 32.8 41 49.2 65.6 82 98.4 114.8 131.2 147.6 164 180.4 196.8 213.2 229.6 246 (oz./ft.) ft.) KSUDA181A (18k) 0.38 24.6 3.1 6.2 9.3 15.6 21.8 28.0 34.3 40.5 46.7 53.0 KSSCA241A (24k) 0.38 24.6...
  • Page 83: Refrigerant Piping System Engineering

    Always follow local codes when selecting and installing copper pipe and piping system components. Approved piping for use with LG Single Zone products will be marked “R32 RATED” along the length of the pipe. Piping wall thickness must meet local code requirements and be approved for maximum allowable pressure of 626 psig. When bending piping, try to keep the number of bends to a minimum, and use the largest radii possible to reduce the equivalent length of installed piping;...
  • Page 84: Copper Expansion And Contraction

    REFRIGERANT PIPING SYSTEM ENGINEERING Copper Expansion and Contraction Under normal operating conditions, the vapor pipe temperature of 1. From the “Linear Thermal Expansion of Copper Tubing in Inches” a Single Zone System can vary as much as 280°F. With this large Table on the next page, find the row corresponding with the actual variance in pipe temperature, the designer must consider pipe length of the straight pipe segment.
  • Page 85 REFRIGERANT PIPING SYSTEM ENGINEERING Table 63: Linear Thermal Expansion of Copper Tubing in Inches. Fluid Temperature °F Pipe Length 35° 40° 45° 50° 55° 60° 65° 70° 75° 80° 85° 90° 95° 100° 105° 110° 115° 120° 125° 130° 0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.11 0.12 0.13 0.14 0.15 0.15 0.08 0.08 0.10 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.22 0.23 0.26 0.28 0.29 0.30 0.12 0.12 0.15 0.18 0.20 0.21 0.23 0.24 0.26 0.27 0.29 0.30 0.32 0.33 0.32 0.35 0.39 0.42 0.44 0.45 0.16 0.16 0.20 0.24 0.26 0.28 0.30 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.43 0.46 0.52 0.56 0.58 0.60...
  • Page 86 Failure to do so will cause significant performance degradation. Proper leak checks must be performed. Using isolation valves does not automatically void any LG product warranty, however, a limited warranty will be voided in whole or part if any field supplied accessory fail in any way that causes product failure.
  • Page 87: Pipe Supports

    REFRIGERANT PIPING SYSTEM ENGINEERING Figure 47: Installing Piping Above and Below an Obstacle. Obstacles When an obstacle, such as an I-beam or concrete T, is in the path of the planned refrigerant pipe run, it is best practice to route the MINIMUM pipe over the obstacle.
  • Page 88: Pipe Sleeves At Penetrations

    Pipe Sleeves at Penetrations LG recommends that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an appropriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and free movement of the pipe within the sleeve.
  • Page 89: Electrical

    ELECTRICAL General Guidelines on page 90 Wiring Diagrams on page 91 Controllers on page 102...
  • Page 90: General Guidelines

    GENERAL GUIDELINES General Electrical Guidelines • Separately wire the high and low voltage lines. There is a risk of electric shock, physical injury, or death. • may cause physical injury or death. • Power wiring and communication cables must be firmly attached to the terminals; connect the wiring so that the wires cannot be easily pulled out.
  • Page 91: Wiring Diagrams

    WIRING DIAGRAMS KUSXA181A, KUSXA241A Outdoor Units Figure 52: KUSXA181A, KUSXA241A Outdoor Unit Wiring Diagram. Dedicated circuit sold separately. CN_FAN(WH) CN_JIG_PC(WH) CN_MAIN (WH) CN_F CN_SUB1_OR CN_PRESS_SW_WH GN/YL MEZ68866126_Rev.01 062424 8 / 24 4. Conventional Thermostat Interface only. To be connected to A-Coil / Furnace only.
  • Page 92 WIRING DIAGRAMS KUSXA301A, KUSXA361A Outdoor Unit Figure 53: KUSXA301A, KUSXA361A Outdoor Unit Wiring Diagram. Dedicated circuit sold separately. CN_PRESS_WH CN_JIG_PC(WH) Motor FUSE_FAN1 250V T 3.15A (up) *Function is optional or factory FUSE_FAN2 250V T 3.15A installed depending on the model. REACTOR_BLUE *Optional parts are purchased separately.
  • Page 93 WIRING DIAGRAMS KUSXA421A, KUSXA481A Outdoor Units Figure 54: KUSXA421A, KUSXA481A Outdoor Unit Wiring Diagram. Dedicated circuit sold separately. CN_PRESS_WH CN_JIG_PC(WH) Motor FUSE_FAN1 250V T 3.15A (up) *Function is optional or factory FUSE_FAN2 installed depending on the model. 250V T 3.15A *Optional parts are purchased REACTOR_BLUE separately.
  • Page 94 WIRING DIAGRAMS KNUDB181A Indoor Units Figure 55: KNUDB181A Indoor Unit Wiring Diagram. ©...
  • Page 95 WIRING DIAGRAMS KNUDB181A Indoor Units Table 65: KNUDB181A Indoor Unit Wiring Diagram Legend. Terminal Purpose Function CN_MOTOR Fan motor output Motor output of BLDC CN_WIFI Wifi Wifi module connection CN_PTC Auxiliary heater relay kit Auxiliary heater relay kit second stage heat CN_FLOAT Float switch input Float switch sensing...
  • Page 96 WIRING DIAGRAMS KNSCB241A, KNSCB301A, KNSCB361A Indoor Units Figure 56: KNSCB241A, KNSCB301A, KNSCB361A Indoor Unit Wiring Diagram. ©...
  • Page 97 WIRING DIAGRAMS KNSCB241A, KNSCB301A, KNSCB361A Indoor Units Table 67: KNSCB241A, KNSCB301A, KNSCB361A Indoor Unit Wiring Diagram Legend. Terminal Purpose Function CN_AIRC1 Air cleaner Air cleaner connection CN_VANE2 Step motor Step motor output CN_VANE1 Step motor Step motor output CN_DISPLAY Display Display of indoor status CN_OPTION Optional PCB EPROM...
  • Page 98 WIRING DIAGRAMS KNSCB421A, KNSCB481A Indoor Units Figure 57: KNSCB421A, KNSCB481A Indoor Unit Wiring Diagram. ©...
  • Page 99 WIRING DIAGRAMS KNSCB421A, KNSCB481A Indoor Units Table 69: KNSCB421A, KNSCB481A Indoor Unit Wiring Diagram Legend. Terminal Purpose Function CN_AIRC1 Air cleaner Air cleaner connection CN_VANE2 Step motor Step motor output CN_VANE1 Step motor Step motor output CN_DISPLAY Display Display of indoor status CN_OPTION Optional PCB EPROM Option PCB connection...
  • Page 100: Power Supply / Power Wiring

    Figure 58: Circuit Breaker. • LG single zone systems operate at 1Ø, 208-230V, 60Hz; confirm Circuit Breaker power source specifications. Main • Follow manufacturer’s circuit diagrams displayed on the inside of Power Source the control box cover. Switch Box • It is recommended that a circuit breaker is installed, especially if conditions could become wet or moist.
  • Page 101: Indoor Unit

    Indoor Unit Figure 61: R32 Single Zone • Power wiring from the single zone outdoor unit to the indoor unit Figure 63: R32 Single-Zone Outdoor Unit to Indoor Unit Wiring must use a minimum of 14 AWG, three (3) conductor, stranded, Outdoor Unit to Indoor Unit Wiring and Communications Cable shielded or unshielded (if shielded, must be grounded to the chas-...
  • Page 102: Controllers

    Optional controllers (see “Functions, Controls, Options”, or contact an LG representative for more information) can connect to the indoor unit in one of two different ways. 1. LG Wired Remote Extension Cable with Molex plug (PZCWRC1; sold separately) that connects to the CN-REMO terminal on the indoor unit PCB.
  • Page 103 CONTROLLERS Wired Controller Placement Figure 67: Proper Location for the Wired Controller. Wired controllers include a sensor to detect room temperature. To maintain comfort levels in the conditioned space, the wired control- ler must be installed in a location away from direct sunlight, high humidity, and where it could be directly exposed to cold air.
  • Page 104: Limited Warranty

    LIMITED WARRANTY (USA) The product’s full Limited Warranty terms and conditions and arbitration ©...
  • Page 105 LG Electronics, U.S.A., Inc. Air Conditioning Technologies 4300 North Point Parkway Alpharetta, Georgia 30022 EM_SZ_FourWayCassette_LGRED_R32_11_24 www.lghvac.com...

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