LG KSUDB091A Engineering Manual

R32 single-zone four-way cassette

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KSUDB091A (9,000 Btu/h)

KSUDB121A (12,000 Btu/h)

KSSCB241A (24,000 Btu/h)

ENGINEERING MANUAL

KSUDB181A (18,000 Btu/h)

KSSCB301A (30,000 Btu/h)

R32 SINGLE-ZONE

FOUR-WAY CASSETTE

KSSCB361A (36,000 Btu/h)

KSSCB421A (42,000 Btu/h)

KSSCB481A (48,000 Btu/h)

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Summary of Contents for LG KSUDB091A

Page 1 R32 SINGLE-ZONE FOUR-WAY CASSETTE ENGINEERING MANUAL KSUDB091A (9,000 Btu/h) KSUDB121A (12,000 Btu/h) KSUDB181A (18,000 Btu/h) KSSCB361A (36,000 Btu/h) KSSCB421A (42,000 Btu/h) KSSCB301A (30,000 Btu/h) KSSCB481A (48,000 Btu/h) KSSCB241A (24,000 Btu/h)
Page 2 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 Features All LG product design criteria have been loaded into the program, making LATS simple to use: double click or drag and drop the component choices. Build systems in Tree Mode where the refrigerant system can be viewed. Switch to a Schematic diagram to see the electrical and communications wiring.
Page 4 LATS can generate an Excel GERP report that can be imported into the LG SOPS pricing and ordering system.
Page 5 TABLE OF CONTENTS LG Air Conditioner Technical Solution ..................................3-4 Table of Symbols ..........................................6 Product Data ..........................................7-39 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 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 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 29 Air Flow, Temperature Distribution Graphs on page 33 Acoustic Data on page 36...
Page 8 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 The following table shows the available outdoor and indoor unit, along with the factory provided controller. Table 1: R32 Single Zone Four-Way Ceiling Cassette System Pairing Table Outdoor Unit Model Indoor Unit Model Controller KUSXB091A KNUDB091A PQWRHQ0FDB KUSXB121A KNUDB121A KUSXB181A KNUDB181A...
Page 10 18 AWG, two-conductor, Standard for Safety and bear the CSA label. Wiring in these units stranded, shielded or are in accordance with the national Electrical Code (NEC). LG single unshielded communications zone four-way ceiling cassette systems have published performance...
Page 11 MECHANICAL SPECIFICATIONS Frequency ranges for the outdoor units are: remote controller to customize Figure 3: R32 Single Zone the airflow pattern for the con- Four-Way 2 x 2 Ceiling Cassette 9k and 12k Btu/h = 10 to 90 Hz Cooling; 10 to 100 Hz Heating ditioned space.
Page 12 The case has a factory designated cutout for the connection of a field-supplied outside air duct. An optional flange kit is available from The indoor units are Wi-Fi compatible with the addition of an LG Wi- Fi module accessory, and can be controlled by LG’s ThinQ™ app on a smart device.
Page 13 GENERAL DATA Table 2: KSUDB091A KSUDB121A KSUDB181A System (Model) (Indoor Unit / Outdoor Unit) (KNUDB091A / KUSXB091A) (KNUDB121A / KUSXB121A) (KNUDB181A / KUSXB181A) Grille Model No. PT-QAGW0 PT-QAGW0 PT-QAGW0 Cooling Capacity (Min/Rated/Max) (Btu/h) 3,400~9,000~9,900 3,600~11,100~12,400 7,200~18,000 ~23,000 Cooling Power Input (Min/Rated/Max) (kW) 0.18 ~0.65~0.83...
Page 14 GENERAL DATA Table 3: KSUDB091A KSUDB121A KSUDB181A System (Model) (Indoor Unit / Outdoor Unit) (KNUDB091A / KUSXB091A) (KNUDB121A / KUSXB121A) (KNUDB181A / KUSXB181A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64...
Page 15 GENERAL DATA Table 4: System (Model) KSSCB241A KSSCB301A KSSCB361A (Indoor Unit / Outdoor Unit) (KNSCB241A / KUSXB241A) (KNSCB301A / KUSXB301A) (KNSCB361A / KUSXB361A) Grille Model No. PT-AAGW0 PT-AAGW0 PT-AAGW0 Cooling Capacity (Min/Rated/Max) (Btu/h) 9,300~23,000~29,000 12,000~30,000~35,000 14,400~36,000~42,000 Cooling Power Input (Min/Rated/Max) (kW) 0.59~1.769~3.10 0.80~2.480~3.60 0.72~2.77~3.90...
Page 16 GENERAL DATA Table 5: KSSCB241A KSSCB301A KSSCB361A System (Model) (Indoor Unit / Outdoor Unit) (KNSCB241A / KUSXB241A) (KNSCB301A / KUSXB301A) (KNSCB361A / KUSXB361A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64 Cooling Sound Pressure dB(A)
Page 17 GENERAL DATA Table 6: System (Model) KSSCB421A KSSCB481A (Indoor Unit / Outdoor Unit) (KNSCB421A / KUSXB421A) (KNSCB481A / KUSXB481A) Grille Model No. PT-AAGW0 PT-AAGW0 Cooling Capacity (Min/Rated/Max) (Btu/h) 16,800~42,000~48,700 19,200~48,000~53,000 Cooling Power Input (Min/Rated/Max) (kW) 1.16~3.18~5.50 1.15~3.97~5.92 EER2 (@95°F) 13.2 12.10 SEER2 21.0...
Page 18 GENERAL DATA Table 7: KSSCB421A KSSCB481A System (Model) (Indoor Unit / Outdoor Unit) (KNSCB421A / KUSXB421A) (KNSCB481A / KUSXB481A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64 Cooling Sound Pressure dB(A) Heating Max.
Page 19 Range Compressor Condenser Phase Hertz Voltage MCA MOP LRA Motor RLA Condenser Tons (Min. to Quantity Fan Motor (Cooling) Fan Qty. 2x2 Cassette KSUDB091A 13.4 KSUDB121A 208 - 230 187~253 13.4 1-1/2 KSUDB181A 16.0 11.5 11.5 3x3 Cassette KSSCB241A 16.0 11.5...
Page 20 Dry Contact 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: Unit Option Requires wired zone controller. X: Not Available Requires Wi-Fi module PWFMDD200.
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 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 26 OUTDOOR UNIT DIMENSIONS KUSXB181A, KUSXB241A, KUSXB301A Figure 7: KUSXB181A, KUSXB241A, KUSXB301A Outdoor Unit Dimensions. ©...
Page 27 OUTDOOR UNIT DIMENSIONS KUSXB361A, KUSXB421A, KUSXB481A Figure 8: KUSXB361A, KUSXB421A, KUSXB481A Outdoor Unit Dimensions. ©...
Page 28 74.4 • 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 29 INDOOR UNIT DIMENSIONS KNUDB091A, KNUDB121A Figure 10: KNUDB091A, KNUDB121A 2x2 Indoor Unit Dimensions. 1-11/32 1-11/32 3-37/64 1-61/64 1-61/64 Maximum Condensate Lift: 27-9/16 3-37/64 3-37/64 ©...
Page 30 INDOOR UNIT DIMENSIONS KNUDB181A Figure 11: 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 32 INDOOR UNIT DIMENSIONS KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A Figure 13: KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A 3x3 Indoor Unit Dimensions. ©...
Page 33 AIR FLOW Indoor Unit Air Flow / Temperature Distribution Figure 14: KNUDB091A Air Velocity and Temperature Distribution Charts. Cooling Heating Discharge angle: 40° Discharge angle: 50° Air velocity [ft/s] Air velocity [ft/s] Temperature [°F] Temperature [°F] Figure 15: KNUDB121A Air Velocity and Temperature Distribution Charts. Cooling Heating Discharge angle: 40°...
Page 34 AIR FLOW Indoor Unit Air Flow / Temperature Distribution Figure 16: KNUDB181A Air Velocity and Temperature Distribution Charts. Figure 17: 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 35 AIR FLOW Indoor Unit Air Flow / Temperature Distribution Figure 18: 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 36 ACOUSTIC DATA Sound Pressure for Outdoor Units Figure 20: Four-Way Ceiling Cassette Outdoor Unit • Measurements taken with no attenuation and units operating at full load normal Sound Pressure Level Measurement Location (For operating condition. Illustrative Purposes Only; Appearance Depends on •...
Page 37 ACOUSTIC DATA Sound Power for Outdoor Units Table 14: 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. KUSXB091A KUSXB121A •...
Page 38 ACOUSTIC DATA Sound Pressure for Indoor Units Figure 23: Four-Way Ceiling 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 39 ACOUSTIC DATA Sound Power for Indoor Units Table 16: Four-Way Ceiling Cassette Indoor Unit Sound Power Levels (dB[A]). • Data is valid under diffuse field conditions. Sound Power Levels (dB[A]) Model • Data is valid under nominal operating conditions. KNUDB091A •...
Page 40 PERFORMANCE DATA Cooling Capacity on page 41 Maximum Cooling Capacity on page 49 Heating Capacity on page 57 Maximum Heating Capacity on page 65 Correction Factors on page 73...
Page 41 COOLING CAPACITY KSUDB091A (KNUDB091A / KUSXB091A) Table 17: KSUDB091A (KNUDB091A / KUSXB091A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 42 COOLING CAPACITY KSUDB121A (KNUDB121A / KUSXB121A) Table 18: KSUDB121A (KNUDB121A / KUSXB121A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 43 COOLING CAPACITY KSUDB181A (KNUDB181A / KUSXB181A) Table 19: KSUDB181 (KNUDB181A / KUSXB181A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 44 COOLING CAPACITY KSSCB241A (KNSCB241A / KUSXB241A) Table 20: KSSCB241A (KNSCB241A / KUSXB241A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 45 COOLING CAPACITY KSSCB301A (KNSCB301A / KUSXB301A) Table 21: KSSCB301A (KNSCB301A / KUSXB301A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 46 COOLING CAPACITY KSSCB361A (KNSCB361A / KUSXB361A) Table 22: KSSCB361A (KNSCB361A / KUSXB361A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 47 COOLING CAPACITY KSSCB421A (KNSCB421A / KUSXB421A) Table 23: KSSCB421A (KNSCB421A / KUSXB421A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 48 COOLING CAPACITY KSSCB481A (KNSCB481A / KUSXB481A) Table 24: KSSCB481A (KNSCB481A / KUSXB481A) Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 49 MAXIMUM COOLING CAPACITY KSUDB091A (KNUDB091A / KUSXB091A) Table 25: KSUDB091A (KNUDB091A / KUSXB091A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 50 MAXIMUM COOLING CAPACITY KSUDB121A (KNUDB121A / KUSXB121A) Table 26: KSUDB121A (KNUDB121A / KUSXB121A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 51 MAXIMUM COOLING CAPACITY KSUDB181A (KNUDB181A / KUSXB181A) Table 27: KSUDB181A (KNUDB181A / KUSXB181A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 52 MAXIMUM COOLING CAPACITY KSSCB241A (KNSCB241A / KUSXB241A) Table 28: KSSCB241A (KNSCB241A / KUSXB241A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 53 MAXIMUM COOLING CAPACITY KSSCB301A (KNSCB301A / KUSXB301A) Table 29: KSSCB301A (KNSCB301A / KUSXB301A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 54 MAXIMUM COOLING CAPACITY KSSCB361A (KNSCB361A / KUSXB361A) Table 30: KSSCB361A (KNSCB361A / KUSXB361A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 55 MAXIMUM COOLING CAPACITY KSSCB421A (KNSCB421A / KUSXB421A) Table 31: KSSCB421A (KNSCB421A / KUSXB421A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 56 MAXIMUM COOLING CAPACITY KSSCB481A (KNSCB481A / KUSXB481A) Table 32: KSSCB481A (KNSCB481A / KUSXB481A) Maximum Cooling Capacities. Indoor Air Temperature (°F DB / °F WB) Outdoor Air 68 / 57 72 / 61 77 / 64 80 / 67 86 / 72 90 / 75 Temp.
Page 57 HEATING CAPACITY KSUDB091A (KNUDB091A / KUSXB091A) Table 33: KSUDB091A (KNUDB091A / KUSXB091A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 0.53 0.55 0.56 0.57 0.58 0.60 -0.4 0.55 0.56 0.58 0.59 0.60 0.61 0.57...
Page 58 HEATING CAPACITY KSUDB121A (KNUDB121A / KUSXB121A) Table 34: KSUDB121A (KNUDB121A / KUSXB121A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 0.76 0.79 0.81 0.83 0.83 0.86 -0.4 0.79 0.81 0.83 0.85 0.86 0.88 0.81 0.84 0.86...
Page 59 HEATING CAPACITY KSUDB181A (KNUDB181A / KUSXB181A) Table 35: KSUDB181A (KNUDB181A / KUSXB181A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 1.19 1.22 1.25 1.28 1.29 1.33 -0.4 10.9 1.22 10.3 1.25 10.1 1.29 10.0 1.32 1.33...
Page 60 HEATING CAPACITY KSSCB241A (KNSCB241A / KUSXB241A) Table 36: KSSCB241A (KNSCB241A / KUSXB241A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 11.0 1.38 10.2 1.42 10.2 1.46 10.1 1.49 10.0 1.51 1.55 -0.4 13.0 1.42 12.2 1.46...
Page 61 HEATING CAPACITY KSSCB301A (KNSCB301A / KUSXB301A) Table 37: KSSCB301A (KNSCB301A / KUSXB301A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 13.6 1.62 12.7 1.66 12.6 1.72 12.4 1.75 12.3 1.77 11.8 1.82 -0.4 16.0 1.66 15.1...
Page 62 HEATING CAPACITY KSSCB361A (KNSCB361A / KUSXB361A) Table 38: KSSCB361A (KNSCB361A / KUSXB361A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 18.6 1.96 17.3 2.02 17.2 2.07 16.9 2.12 16.8 2.14 16.0 2.20 -0.4 20.8 2.02 19.6...
Page 63 HEATING CAPACITY KSSCB421A (KNSCB421A / KUSXB421A) Table 39: KSSCB421A (KNSCB421A / KUSXB421A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 22.5 2.30 21.0 2.37 20.8 2.43 20.5 2.48 20.3 2.50 19.4 2.58 -0.4 25.1 2.37 23.7...
Page 64 HEATING CAPACITY KSSCB481A (KNSCB481A / KUSXB481A) Table 40: KSSCB481A (KNSCB481A / KUSXB481A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 24.1 2.50 22.5 2.58 22.3 2.64 22.0 2.70 21.8 2.72 20.8 2.80 -0.4 27.0 2.58 25.4...
Page 65 MAXIMUM HEATING CAPACITY KSUDB091A (KNUDB091A / KUSXB091A) Table 41: KSUDB091A (KNUDB091A / KUSXB091A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 10.0 1.24 1.29 1.33 1.35 1.37 1.41 -0.4 10.5 1.29 10.2 1.33...
Page 66 MAXIMUM HEATING CAPACITY KSUDB121A (KNUDB121A / KUSXB121A) Table 42: KSUDB121A (KNUDB121A / KUSXB121A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 10.5 1.27 10.3 1.32 10.0 1.36 1.38 1.40 1.44 -0.4 10.9 1.30 10.7 1.34...
Page 67 MAXIMUM HEATING CAPACITY KSUDB181A (KNUDB181A / KUSXB181A) Table 43: KSUDB181A (KNUDB181A / KUSXB181A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 18.9 2.57 18.4 2.66 17.9 2.74 17.6 2.79 17.4 2.83 16.7 2.91 -0.4 19.5...
Page 68 MAXIMUM HEATING CAPACITY KSSCB241A (KNSCB241A / KUSXB241A) Table 44: KSSCB241A (KNSCB241A / KUSXB241A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 22.5 2.79 22.0 2.89 21.3 2.98 21.0 3.03 20.7 3.07 20.0 3.16 -0.4 23.4...
Page 69 MAXIMUM HEATING CAPACITY KSSCB301A (KNSCB301A / KUSXB301A) Table 45: KSSCB301A (KNSCB301A / KUSXB301A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 28.9 3.71 28.2 3.84 27.4 3.96 27.0 4.03 26.7 4.08 25.7 4.20 -0.4 31.1...
Page 70 MAXIMUM HEATING CAPACITY KSSCB361A (KNSCB361A / KUSXB361A) Table 46: KSSCB361A (KNSCB361A / KUSXB361A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 33.7 4.66 32.9 4.82 32.0 4.97 31.5 5.06 31.0 5.13 29.9 5.28 -0.4 35.4...
Page 71 MAXIMUM HEATING CAPACITY KSSCB421A (KNSCB421A / KUSXB421A) Table 47: KSSCB421A (KNSCB421A / KUSXB421A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 37.7 5.41 36.9 5.60 35.8 5.77 35.2 5.87 34.7 5.96 33.5 6.13 -0.4 39.8...
Page 72 MAXIMUM HEATING CAPACITY KSSCB481A (KNSCB481A / KUSXB481A) Table 48: KSSCB481A (KNSCB481A / KUSXB481A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 39.6 5.68 38.7 5.88 37.6 6.06 37.0 6.16 36.5 6.25 35.1 6.43 -0.4 41.0...
Page 73 Table 49: Piping Length (ft.) 24.6 32.8 49.2 65.6 98.4 131.2 196.9 229.7 Cooling Capacity Coefficient Factor KSUDB091A (9,000 Btu/h) 99.3 KSUDB121A (12,000 Btu/h) 99.3 KSUDB181A (18,000 Btu/h) 98.1 96.1 94.3 92.1 KSSCB241A (24,000 Btu/h) 98.1 96.1 94.3...
Page 74 • 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 75 APPLICATION GUIDELINES Installing Outdoor Units Indoors on page 84...
Page 76 Indoor Units Selecting the Best Location for the Indoor Unit Figure 26: Cassette Indoor Unit Clearance Requirements. Follow recommended best practices when choosing an indoor location for the single zone indoor unit. Ceiling 13/32 Select a location for installing the indoor units that will meet the following or more Ceiling Board Ceiling Board...
Page 77 Indoor Units explosion, and physical injury or death. the IDUs are installed, proper air make up or supply and / or adequate ventilation should be provided. Additionally, in buildings where IDUs will be • 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 78 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 79 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 80 Outdoor Units Oceanside Applications Figure 31: Prevailing Wind Figure 32: Leeward Side of the Direction. 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 81 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. • Include enough space for airflow and for service access. If installing multiple outdoor units, avoid placing the units where the discharge of one unit will blow into the inlet side of an adjacent unit.
Page 82 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 83 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 39: 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 84 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 85 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 86 INSTALLING OUTDOOR UNITS INDOORS Open Rate by Louver Radian Figure 41: 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 87 REFRIGERANT PIPING DESIGN Refrigerant Flow Diagrams on page 88 Connection Limitations and System Layout on page 93 Additional Refrigerant Charge on page 94 Refrigerant Piping System Engineering on page 95...
Page 88 REFRIGERANT FLOW DIAGRAMS KUSXB091A, KUSXB121A Outdoor Units Figure 43: KUSXB091A, KUSXB121A Outdoor Unit Refrigerant Flow Diagram. Inlet Air Temperature Refrigerant Flow Thermistor Cooling Heating Condensing Temperature Thermistor Flare Connection Electronic Expansion Strainer Strainer Valve High Pressure Sensor 4 way Valve High Flare Connection Pressure...
Page 89 REFRIGERANT FLOW DIAGRAMS KUSXB181A, KUSXB241A, KUSXB301A, KUSXB361A, KUSXB421A, KUSXB481A Outdoor Units Figure 44: KUSXB181A, KUSXB241A, KUSXB301A, KUSXB361A, KUSXB421A, KUSXB481A Outdoor Unit Refrigerant Flow Diagram. Condenser Outlet Pipe Temperature Thermistor Condenser Middle Pipe Temperature Thermistor Ø3/8 Inch 36,000 Btu/h, 42,000 Btu/h and 48,000 Btu/h Outdoor Units have two (2) fans.
Page 90 REFRIGERANT FLOW DIAGRAMS KNUDB091A, KNUDB121A Indoor Units Figure 45: KNUDB091A, KNUDB121A Indoor Unit Refrigerant Flow Diagram. Gas pipe connection port Heat exchanger (flare connection) Heating Cooling Evaporator Outlet Turbo fan Temperature Thermistor Indoor Air Temperature Thermistor Evaporator Inlet Temperature Thermistor Liquid pipe connection port (flare connection) Table 60: KNUDB091A, KNUDB121A Indoor Unit Thermistor Details.
Page 91 REFRIGERANT FLOW DIAGRAMS KNUDB181A Indoor Units Figure 47: 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 62: KNUDB181A Indoor Unit Thermistor Details.
Page 92 REFRIGERANT FLOW DIAGRAMS KNSCB241A, KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A Indoor Units Figure 48: KNSCB241A, KNSCB301A, KNSCB361A, KNSCB421A, KNSCB481A Refrigerant Flow Diagram. Gas Pipe Connection Port Heat Exchanger (Flare Connection) Heating Cooling Evaporator Outlet Turbo Fan Temperature Thermistor Suction Air Temperature Thermistor Humidity Sensor Evaporator Inlet Temperature Thermistor...
Page 93 Additional Refrigerant Needed (oz. /ft.) 0.22 0.38 0.38 0.43 System Layout Figure 49: Typical KSUDB091A and KSUDB121A System Layout. Figure 50: Typical KSUDB181A, KSSCB241A, and KSSCB301A System Layout. Unit = Feet Unit = Feet Max Length = A Max Length = A...
Page 94 Length (no 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.) KSUDB091A (9k) 0.22 24.6 1.8 3.6 5.4 9.0 KSUDB121A (12k) 0.22 24.6 1.8 3.6 5.4 9.0 KSUDB181A (18k) 0.38...
Page 95 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 a maximum operating pressure of 626 psi. 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 96 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 97 REFRIGERANT PIPING SYSTEM ENGINEERING Table 72: 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 98 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 99 REFRIGERANT PIPING SYSTEM ENGINEERING Figure 53: 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 100 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 101 ELECTRICAL General Guidelines on page 102 Wiring Diagrams on page 103 Controllers on page 114...
Page 102 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 103 WIRING DIAGRAMS KUSXB091A, KUSXB121A Outdoor Units Figure 58: KUSXB091A, KUSXB121A Outdoor Unit Wiring Diagram. *Dedicated circuit is field supplied. MEZ68866125_Rev.02 061324 8 / 24 ©...
Page 104 WIRING DIAGRAMS KUSXB181A, KUSXB241A, KUSXB301A, KUSXB361A Outdoor Units Figure 59: KUSXB181A, KUSXB241A, KUSXB301A, KUSXB361A Outdoor Unit Wiring Diagram. 1) Only when installing the furnace (thermostat), CN_FAN(WH) CN_JIG_PC(WH) connect comm. line (BK) (WH) to “IDU B”, “IDU A”. (The comm. line is located on clamp in control box.) CN_MAIN (WH) 2) Heater...
Page 105 WIRING DIAGRAMS KUSXB421A, KUSXB481A Outdoor Units Figure 60: KUSXB421A, KUSXB481A Outdoor Unit Wiring Diagram. CN_PRESS_WH CN_JIG_PC(WH) Motor FUSE_FAN1 250V T 3.15A (up) FUSE_FAN2 250V T 3.15A REACTOR_BLUE CN_FAN2_BL CN_COMP Motor (down) L2_BR N2_BL FUSE 690 V, 45 A L1_BR N1_BL MEZ68866134 Rev.00_071524 USE COPPER SUPPLY WIRES.
Page 106 WIRING DIAGRAMS KNUDB091A, KNUDB121A, KNUDB181A Indoor Units Figure 61: KNUDB091A, KNUDB121A, KNUDB181A Indoor Unit Wiring Diagram. ©...
Page 107 WIRING DIAGRAMS KNUDB091A, KNUDB121A, KNUDB181A Indoor Units Table 74: KNUDB091A, KNUDB121A, 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 108 WIRING DIAGRAMS KNSCB241A, KNSCB301A, KNSCB361A Indoor Units Figure 62: KNSCB241A, KNSCB301A, KNSCB361A Indoor Unit Wiring Diagram. ©...
Page 109 WIRING DIAGRAMS KNSCB241A, KNSCB301A, KNSCB361A Indoor Units Table 76: 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 EEPROM...
Page 110 WIRING DIAGRAMS KNSCB421A, KNSCB481A Indoor Units Figure 63: KNSCB421A, KNSCB481A Indoor Unit Wiring Diagram. ©...
Page 111 WIRING DIAGRAMS KNSCB421A, KNSCB481A Indoor Units Table 78: 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 EEPROM Option PCB connection...
Page 112 Figure 64: Circuit Breaker. • LG single zone systems operate at 1Ø, 208-230V, 60Hz; confirm Circuit Breaker power source specifications. • Follow manufacturer’s circuit diagrams displayed on the inside of Main 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 113 Indoor Unit • Power wiring from the single zone outdoor unit to the indoor unit Figure 67: R32 Single-Zone Figure 68: R32 Single-Zone must use a minimum of 14 AWG, three (3) conductor, stranded, Outdoor Unit to Indoor Unit Wiring Outdoor Unit to Indoor Unit Wiring shielded or unshielded (if shielded, must be grounded to the chas- and Communications Wiring...
Page 114 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 115 CONTROLLERS Wired Controller Placement Figure 73: 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 117 LG Electronics, U.S.A., Inc. Air Conditioning Technologies 4300 North Point Parkway Alpharetta, Georgia 30022 www.lghvac.com EM_SZ_FourWayCassette_R32_11_24...

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