Page 1 R32 STANDARD SINGLE-ZONE SYSTEMS - A-COIL ENGINEERING MANUAL KSSMB18AA, KSSMB18BA (18,000 Btu/h) KSSMB36BA, KSSMB36CA (36,000 Btu/h) KSSMB24BA (24,000 Btu/h) KSSMB42CA (42,000 Btu/h) KSSMB30BA (30,000 Btu/h) KSSMB48CA, KSSMB48DA, KSSMB49CA (48,000 Btu/h) KSSMB60CA, KSSMB60DA (60,000 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 General Guidelines ........................................113 Wiring Diagrams ........................................114-117 Power Supply / Power Wiring to the ODU ..................................118 LG Heat Pump ODU to Indoor Component Wiring System ........................... 119-120 ODU Communication Connections and DIP Switch Settings ............................121 Limited Warranty ........................................122 ©...
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 12 Electrical Data on page 20 Functions, Controls, and Options on page 21 Accessories on page 22 Outdoor Unit Dimensions on page 26 A-Coil Unit Dimensions on page 29 Acoustic Data on page 35...
Page 8 36 = 36,000 Btu/h 48 / 49 = 48,000 Btu/h 7. Generation: 1 8. Function A = 208~230V A-Coil Unit Nomenclature 1. LG 2. Refrigerant K = R32 3. Product Category M = A-Coil 4. Cabinet Classification M = Cased Multi-Position 5.
Page 9 PAIRING TABLE The following table shows the available outdoor and A-Coil unit. Table 1: R32 Single Zone System - A-Coil - Pairing Table. Outdoor Unit Model A-Coil Unit Model A-Coil Unit Model KUSXB181A LKMMA18A1 - 14.5 inch LKMMA18B1 - 17.5 inch KUSXB241A LKMMA24B1 - 17.5 inch KUSXB301A...
Page 10 LG single zone systems with A-Coil comprise of a single frame out- door unit connected to a single A-Coil unit with a single refrigerant circuit. An LG single zone with A-Coil is a system that can operate in either cooling or heating mode. The system is capable of chang-...
Page 11 A-Coil Unit LG A-Coil units are factory built and are comprised of aluminum fins mechanically bonded to aluminium tubing. Each A-Coil unit has a minimum of three rows of coils that are pressure tested to 626 psig at the factory.
Page 12 GENERAL DATA Table 2: KSSMB18AA KSSMB18BA KSSMB24BA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA18A1 / KUSXB181A) (LKMMA18B1 / KUSXB181A) (LKMMA24B1 / KUSXB241A) Cooling Capacity (Min/Rated/Max) (Btu/h) 6,800~17,000~19,000 7,200~18,000~20,000 8,900~21,600~24,000 Cooling Power Input (Min/Rated/Max) (kW) 0.52~1.478~1.70 0.57~1.54~1.85 0.70~1.85~2.23 EER2 (@95°F) 11.50...
Page 13 GENERAL DATA Table 3: KSSMB18AA KSSMB18BA KSSMB24BA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA18A1 / KUSXB181A) (LKMMA18B1 / KUSXB181A) (LKMMA24B1 / KUSXB241A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64...
Page 14 GENERAL DATA Table 4: KSSMB30BA KSSMB36BA KSSMB36CA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA30B1 / KUSXB301A) (LKMMA36B1 / KUSXB361A) (LKMMA36C1 / KUSXB361A) Cooling Capacity (Min/Rated/Max) (Btu/h) 9,900~27,600~30,000 13,100~34,400~33.36,000 13,100~34,400~37,000 Cooling Power Input (Min/Rated/Max) (kW) 0.97~2.76~3.31 1.03~2.94~3.27 1.03~2.94~3.47 EER2 (@95°F) 10.00 11.70 11.70...
Page 15 GENERAL DATA Table 5: KSSMB30BA KSSMB36BA KSSMB36CA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA30B1 / KUSXB301A) (LKMMA36B1 / KUSXB361A) (LKMMA36C1 / KUSXB361A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64 Cooling Sound Pressure dB(A)
Page 16 GENERAL DATA Table 6: KSSMB42CA KSSMB48CA KSSMB48DA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA42C1 / KUSXB421A) (LKMMA48C1 / KUSXB481A) (LKMMA48D1 / KUSXB481A) Cooling Capacity (Min/Rated/Max) (Btu/h) 16,000~41,000~44,000 18,200~45,500~48,000 18,200~45,500~49,000 Cooling Power Input (Min/Rated/Max) (kW) 1.23~3.51~3.89 1.56~4.34~4.72 1.45~4.14~4.67 EER2 (@95°F) 11.70 10.50 11.00...
Page 17 GENERAL DATA Table 7: KSSMB42CA KSSMB48CA KSSMB48DA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA42C1 / KUSXB421A) (LKMMA48C1 / KUSXB481A) (LKMMA48D1 / KUSXB481A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64 Cooling Sound Pressure dB(A)
Page 18 GENERAL DATA Table 8: KSSMB49CA KSSMB60CA KSSMB60DA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA48C1 / KUSXB601A) (LKMMA60C1 / KUSXB601A) (LKMMA60D1 / KUSXB601A) Cooling Capacity (Min/Rated/Max) (Btu/h) 18,200~45,500~48,000 20,000~52,500~55,000 20,000~52,500~56,000 Cooling Power Input (Min/Rated/Max) (kW) 1.40~3.89~4.23 1.75~5.00~5.44 1.72~4.91~5.34 EER2 (@95°F) 11.70 10.50 10.70...
Page 19 GENERAL DATA Table 9: KSSMB49CA KSSMB60CA KSSMB60DA System (Model) (A-Coil Unit / Outdoor Unit) (LKMMA48C1 / KUSXB601A) (LKMMA60C1 / KUSXB601A) (LKMMA60D1 / KUSXB601A) Outdoor Unit Data Cooling (°F DB) 5 to +118 Operating Range Heating (°F WB) -4 to +64 Cooling Sound Pressure dB(A)
Page 20 Condenser Fan Motor(s) Nominal System Model Voltage Range Compressor Condenser Phase Hertz Voltage MCA MOP LRA Condenser Tons (Min. to Max.) Quantity Fan Motor Fan Qty. KSSMB18AA 16.0 11.5 KSSMB18BA 16.0 11.5 KSSMB24BA 16.0 11.5 KSSMB30BA 19.1 KSSMB36BA 1.6 x 2 KSSMB36CA 1.6 x 2...
Page 21 ACP 5 BACnet® Gateway LonWorks® Gateway 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 PQSH1200 For Use with 18k ~ 60k Outdoor Units Low Ambient Wind Baffle For 18k , 24k, and 30k Capacities (One [1] Required), ZLABGP04A 36k, 42k, 48k, 60k Capacities (Two [2] Required) LG Airzone Aidoo Pro Wi-Fi Controller AZAI6WSPLGE ©...
Page 23 • Cloud and / or third-party smart thermostat integrations (3PTI). • Temperature limits for hot and cold. Buy Link: Airzone AZAI6WSPLGE AIDOO Pro 3 Wire WiFi Controller for LG Mini Splits. For further information about Airzone Aidoo Pro, go to www.airzonecontrol.com.
Page 24 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 25 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 6: KUSXB181A, KUSXB241A, KUSXB301A Outdoor Unit Dimensions. ©...
Page 27 OUTDOOR UNIT DIMENSIONS KUSXB361A, KUSXB421A, KUSXB481A, KUSXB601A Figure 7: KUSXB361A, KUSXB421A, KUSXB481A, KUSXB601A 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 A-COIL UNIT DIMENSIONS LKMMA18A1 Figure 9: LKMMA18A1 A-Coil Unit Dimensions. LKMMA18A1 3MA Cased Coil Assembly (Left) ABS Horizontal Pan 3MA Coil Assembly ©...
Page 30 A-COIL UNIT DIMENSIONS LKMMA18B1, LKMMA24B1 Figure 10: LKMMA18B1, LKMMA24B1 A-Coil Unit Dimensions. LKMMA18B1, LKMMA24B1 3MC Cased Coil Assembly (Left) ABS Horizontal Pan 3MC Coil Assembly ©...
Page 31 A-COIL UNIT DIMENSIONS LKMMA30B1, LKMMA36B1 Figure 11: LKMMA30B1, LKMMA36B1 A-Coil Unit Dimensions. LKMMA30B1, LKMMA36B1 4MC Cased Coil Assembly (Left) 4MC Coil Assembly Horizontal ©...
Page 32 A-COIL UNIT DIMENSIONS LKMMA36C1 Figure 12: LKMMA36C1 A-Coil Unit Dimensions. LKMMA36C1 4ME Cased Coil Assembly (Left) Horizontal 4ME Coil Assembly ©...
Page 33 A-COIL UNIT DIMENSIONS LKMMA42C1, LKMMA48C1, LKMMA60C1 Figure 13: LKMMA42C1, LKMMA48C1, LKMMA60C1 A-Coil Unit Dimensions. LKMMA42C1, LKMMA48C1, LKMMA60C1 5ME Cased Coil Assembly (Left) Large Vertical 5ME Coil Assembly Pan 16FL ©...
Page 34 A-COIL UNIT DIMENSIONS LKMMA48D1, LKMMA60D1 Figure 14: LKMMA48D1, LKMMA60D1 A-Coil Unit Dimensions. LKMMA48D1, LKMMA60D1 5MG Cased Coil Assembly LG (Left) 5MG Coil Assembly Large Vertical Pan 16FL ©...
Page 35 ACOUSTIC DATA Sound Pressure for Outdoor Units Figure 15: R32 Standard Singe-Zone Systems - A-Coil • Measurements taken with no attenuation and units operating at full load normal Outdoor Unit Sound Pressure Level Measurement operating condition. Location (For Illustrative Purposes Only; Appearance •...
Page 36 ACOUSTIC DATA Sound Power for Outdoor Units Table 15: R32 Standard Singe-Zone Systems - A-Coil 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. KUSXB181A •...
Page 37 PERFORMANCE DATA Cooling Capacity on page 38 Maximum Cooling Capacity on page 50 Heating Capacity on page 62 Maximum Heating Capacity on page 74 Correction Factors on page 86...
Page 38 COOLING CAPACITY KSSMB18AA (LKMMA18A1 / KUSXB181A) Table 16: KSSMB18AA (LKMMA18A1 / 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 39 COOLING CAPACITY KSSMB18BA (LKMMA18B1 / KUSXB181A) Table 17: KSSMB18BA (LKMMA18B1 / 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 40 COOLING CAPACITY KSSMB24BA (LKMMA24B1 / KUSXB241A) Table 18: KSSMB24BA (LKMMA24B1 / 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 41 COOLING CAPACITY KSSMB30BA (LKMMA30B1 / KUSXB301A) Table 19: KSSMB30BA (LKMMA30B1 / 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 42 COOLING CAPACITY KSSMB36BA (LKMMA36B1 / KUSXB361A) Table 20: KSSMB36BA (LKMMA36B1 / 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 43 COOLING CAPACITY KSSMB36CA (LKMMA36C1 / KUSXB361A) Table 21: KSSMB36CA (LKMMA36C1 / 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 44 COOLING CAPACITY KSSMB42CA (LKMMA42C1 / KUSXB421A) Table 22: KSSMB42CA (LKMMA42C1 / 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 45 COOLING CAPACITY KSSMB48CA (LKMMA48C1 / KUSXB481A) Table 23: KSSMB48CA (LKMMA48C1 / 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 46 COOLING CAPACITY KSSMB48DA (LKMMA48D1 / KUSXB481A) Table 24: KSSMB48DA (LKMMA48D1 / 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 47 COOLING CAPACITY KSSMB49CA (LKMMA48C1 / KUSXB601A) Table 25: KSSMB49CA (LKMMA48C1 / 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 48 COOLING CAPACITY KSSMB60CA (LKMMA60C1 / KUSXB601A) Table 26: KSSMB60CA (LKMMA60C1 / KUSXB601A) 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 COOLING CAPACITY KSSMB60DA (LKMMA60D1 / KUSXB601A) Table 27: KSSMB60DA (LKMMA60D1 / KUSXB601A) 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 KSSMB18AA (LKMMA18A1 / KUSXB181A) Table 28: KSSMB18AA (LKMMA18A1 / 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 51 MAXIMUM COOLING CAPACITY KSSMB18BA (LKMMA18B1 / KUSXB181A) Table 29: KSSMB18BA (LKMMA18B1 / 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 KSSMB24BA (LKMMA24B1 / KUSXB241A) Table 30: KSSMB24BA (LKMMA24B1 / 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 KSSMB30BA (LKMMA30B1 / KUSXB301A) Table 31: KSSMB30BA (LKMMA30B1 / 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 KSSMB36BA (LKMMA36B1 / KUSXB361A) Table 32: KSSMB36BA (LKMMA36B1 / 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 KSSMB36CA (LKMMA36C1 / KUSXB361A) Table 33: KSSMB36CA (LKMMA36C1 / 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 56 MAXIMUM COOLING CAPACITY KSSMB42CA (LKMMA42C1 / KUSXB421A) Table 34: KSSMB42CA (LKMMA42C1 / 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 57 MAXIMUM COOLING CAPACITY KSSMB48CA (LKMMA48C1 / KUSXB481A) Table 35: KSSMB48CA (LKMMA48C1 / 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 58 MAXIMUM COOLING CAPACITY KSSMB48DA (LKMMA48D1 / KUSXB481A) Table 36: KSSMB48DA (LKMMA48D1 / 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 59 MAXIMUM COOLING CAPACITY KSSMB49CA (LKMMA48C1 / KUSXB601A) Table 37: KSSMB49CA (LKMMA48C1 / 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 60 MAXIMUM COOLING CAPACITY KSSMB60CA (LKMMA60C1 / KUSXB601A) Table 38: KSSMB60CA (LKMMA60C1 / KUSXB601A) 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 61 MAXIMUM COOLING CAPACITY KSSMB60DA (LKMMA60D1 / KUSXB601A) Table 39: KSSMB60DA (LKMMA60D1 / KUSXB601A) 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 62 HEATING CAPACITY KSSMB18AA (LKMMA18A1 / KUSXB181A) Table 40: KSSMB18AA (LKMMA18A1 / KUSXB181A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 9.74 1.29 9.09 1.34 9.00 1.37 8.88 1.40 8.79 1.41 8.41 1.45 -0.4 10.89...
Page 63 HEATING CAPACITY KSSMB18BA (LKMMA18B1 / KUSXB181A) Table 41: KSSMB18BA (LKMMA18B1 / KUSXB181A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 9.74 1.29 9.09 1.34 9.00 1.37 8.88 1.40 8.79 1.41 8.41 1.45 -0.4 10.89 1.34 10.27...
Page 64 HEATING CAPACITY KSSMB24BA (LKMMA24B1 / KUSXB241A) Table 42: KSSMB24BA (LKMMA24B1 / KUSXB241A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 11.99 1.69 11.19 1.75 11.07 1.79 10.93 1.83 10.81 1.84 10.35 1.90 -0.4 13.40 1.75 12.64...
Page 65 HEATING CAPACITY KSSMB30BA (LKMMA30B1 / KUSXB301A) Table 43: KSSMB30BA (LKMMA30B1 / KUSXB301A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 14.98 2.18 13.99 2.25 13.84 2.30 13.66 2.35 13.52 2.37 12.93 2.44 -0.4 16.75 2.25 15.80...
Page 66 HEATING CAPACITY KSSMB36BA (LKMMA36B1 / KUSXB361A) Table 44: KSSMB36BA (LKMMA36B1 / KUSXB361A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 18.0 2.59 16.8 2.67 16.6 2.74 16.4 2.80 16.2 2.82 15.5 2.91 -0.4 20.1 2.67 19.0...
Page 67 HEATING CAPACITY KSSMB36CA (LKMMA36C1 / KUSXB361A) Table 45: KSSMB36CA (LKMMA36C1 / KUSXB361A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 17.98 2.59 16.78 2.67 16.61 2.74 16.40 2.80 16.22 2.82 15.52 2.91 -0.4 20.10 2.67 18.96...
Page 68 HEATING CAPACITY KSSMB42CA (LKMMA42C1 / KUSXB421A) Table 46: KSSMB42CA (LKMMA42C1 / KUSXB421A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 21.72 2.91 20.28 3.01 20.07 3.08 19.81 3.15 19.60 3.17 18.75 3.27 -0.4 24.29 3.01 22.91...
Page 69 HEATING CAPACITY KSSMB48CA (LKMMA48C1 / KUSXB481A) Table 47: KSSMB48CA (LKMMA48C1 / KUSXB481A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 23.97 3.16 22.38 3.26 22.14 3.34 21.86 3.41 21.63 3.44 20.69 3.54 -0.4 26.80 3.26 25.28...
Page 70 HEATING CAPACITY KSSMB48DA (LKMMA48D1 / KUSXB481A) Table 48: KSSMB48DA (LKMMA48D1 / KUSXB481A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 23.97 3.16 22.38 3.26 22.14 3.34 21.86 3.41 21.63 3.44 20.69 3.54 -0.4 26.80 3.26 25.28...
Page 71 HEATING CAPACITY KSSMB49CA (LKMMA48C1 / KUSXB601A) Table 49: KSSMB49CA (LKMMA48C1 / KUSXB481A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 23.97 3.30 22.38 3.41 22.14 3.49 21.86 3.57 21.63 3.60 20.69 3.70 -0.4 26.80 3.41 25.28...
Page 72 HEATING CAPACITY KSSMB60CA (LKMMA60C1 / KUSXB601A) Table 50: KSSMB60CA (LKMMA60C1 / KUSXB601A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 27.27 3.48 25.46 3.59 25.19 3.68 24.87 3.76 24.60 3.79 23.54 3.90 -0.4 30.49 3.59 28.76...
Page 73 HEATING CAPACITY KSSMB60DA (LKMMA60D1 / KUSXB601A) Table 51: KSSMB60DA (LKMMA60D1 / KUSXB601A) Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 27.27 3.48 25.46 3.59 25.19 3.68 24.87 3.76 24.60 3.79 23.54 3.90 -0.4 30.49 3.59 28.76...
Page 74 MAXIMUM HEATING CAPACITY KSSMB18AA (LKMMA18A1 / KUSXB181A) Table 52: KSSMB18AA (LKMMA18A1 / KUSXB181A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 16.0 2.36 15.6 2.44 15.1 2.52 14.9 2.56 14.7 2.60 14.2 2.67...
Page 75 MAXIMUM HEATING CAPACITY KSSMB18BA (LKMMA18B1 / KUSXB181A) Table 53: KSSMB18BA (LKMMA18B1 / KUSXB181A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 16.0 2.36 15.6 2.44 15.1 2.52 14.9 2.56 14.7 2.60 14.2 2.67 -0.4 16.5...
Page 76 MAXIMUM HEATING CAPACITY KSSMB24BA (LKMMA24B1 / KUSXB241A) Table 54: KSSMB24BA (LKMMA24B1 / KUSXB241A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 18.8 2.86 18.4 2.96 17.9 3.05 17.6 3.10 17.4 3.15 16.7 3.24 -0.4 20.0...
Page 77 MAXIMUM HEATING CAPACITY KSSMB30BA (LKMMA30B1 / KUSXB301A) Table 55: KSSMB30BA (LKMMA30B1 / KUSXB301A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 23.3 3.53 22.8 3.65 22.2 3.76 21.8 3.83 21.5 3.89 20.7 4.00 -0.4 24.4...
Page 78 MAXIMUM HEATING CAPACITY KSSMB36BA (LKMMA36B1 / KUSXB361A) Table 56: KSSMB36BA (LKMMA36B1 / KUSXB361A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 31.2 4.71 30.5 4.87 29.6 5.02 29.1 5.11 28.7 5.18 27.7 5.33 -0.4 32.5...
Page 79 MAXIMUM HEATING CAPACITY KSSMB36CA (LKMMA36C1 / KUSXB361A) Table 57: KSSMB36CA (LKMMA36C1 / KUSXB361A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 31.2 4.71 30.5 4.87 29.6 5.02 29.1 5.11 28.7 5.18 27.7 5.33 -0.4 32.5...
Page 80 MAXIMUM HEATING CAPACITY KSSMB42CA (LKMMA42C1 / KUSXB421A) Table 58: KSSMB42CA (LKMMA42C1 / KUSXB421A)Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 34.3 5.19 33.5 5.37 32.5 5.53 32.0 5.63 31.6 5.71 30.4 5.88 -0.4 36.2 5.29...
Page 81 MAXIMUM HEATING CAPACITY KSSMB48CA (LKMMA48C1 / KUSXB481A) Table 59: KSSMB48CA (LKMMA48C1 / KUSXB481A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 36.2 5.53 35.4 5.72 34.4 5.90 33.8 6.00 33.4 6.09 32.1 6.26 -0.4 38.2...
Page 82 MAXIMUM HEATING CAPACITY KSSMB48DA (LKMMA48D1 / KUSXB481A) Table 60: KSSMB48DA (LKMMA48D1 / KUSXB481A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 35.0 5.53 34.2 5.72 33.2 5.90 32.7 6.00 32.3 6.09 31.1 6.26 -0.4 37.5...
Page 83 MAXIMUM HEATING CAPACITY KSSMB49CA (LKMMA48C1 / KUSXB601A) Table 61: KSSMB49CA (LKMMA48C1 / KUSXB481A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 39.1 5.85 38.2 6.05 37.1 6.24 36.5 6.35 36.0 6.44 34.7 6.63 -0.4 41.2...
Page 84 MAXIMUM HEATING CAPACITY KSSMB60CA (LKMMA60C1 / KUSXB601A) Table 62: KSSMB60CA (LKMMA60C1 / KUSXB601A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 40.1 6.01 39.2 6.22 38.0 6.41 37.4 6.52 36.9 6.61 35.6 6.80 -0.4 43.2...
Page 85 MAXIMUM HEATING CAPACITY KSSMB60DA (LKMMA60D1 / KUSXB601A) Table 63: KSSMB60DA (LKMMA60D1 / KUSXB601A) Maximum Heating Capacities. Outdoor Air Indoor Air Temperature (°F DB) Temp. °F DB °F WB -4.4 40.1 6.01 39.2 6.22 38.0 6.41 37.4 6.52 36.9 6.61 35.6 6.80 -0.4 43.2...
Page 86 Table 64: Piping Length (ft.) 24.6 32.8 49.2 65.6 98.4 131.2 196.9 229.7 Cooling Capacity Coefficient Factor KSSMB18AA (18,000 Btu/h) 98.1 96.1 94.3 92.1 KSSMB18BA (18,000 Btu/h) 98.1 96.1 94.3 92.1 KSSMB24BA (24,000 Btu/h) 98.1 96.1...
Page 87 • 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 88 APPLICATION GUIDELINES Installing Outdoor Units Indoors on page 97...
Page 89 A-Coil Units Selecting the Best Location for the A-Coil and Other Indoor Components Follow recommended best practices when choosing an indoor location for the single zone indoor components. • Place the unit where air circulation will not be blocked. • Locate the indoor components in a location that is level, with enough strength to bear the weight of the indoor components, and where the components can be easily connected to the outdoor unit.
Page 90 A-Coil Installation Options LG A-Coils are designed for upflow, downflow, horizontal right, and horizontal left applications. For horizontal installations, a blowoff guard is necessary to prevent furnace air from blowing condensate out of the A-Coil. The condensate blowoff guard is included with the A-Coil.
Page 91 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 92 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 93 Outdoor Units Oceanside Applications Figure 23: Prevailing Wind Figure 24: 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 94 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 95 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 96 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 31: 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 97 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 98 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 99 INSTALLING OUTDOOR UNITS INDOORS Open Rate by Louver Radian Figure 33: 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 100 REFRIGERANT PIPING DESIGN Refrigerant Flow Diagrams on page 101 Connection Limitations and System Layout on page 104 Additional Refrigerant Charge on page 105 Refrigerant Piping System Engineering on page 106...
Page 101 REFRIGERANT FLOW DIAGRAMS KUSXB181A to KUSXB481A Outdoor Units Figure 35: KUSXB181A to KUSXB481A Outdoor Unit Refrigerant Flow Diagram. Refrigerant Flow Cond-out pipe Air temperature Cooling temperature thermistor Heating thermistor Cond-mid pipe temperature thermistor Ø3/8 in. (Ø9.52 mm) Flare Connection Distributor Strainer Strainer 36,000 Btu/h, 42,000 Btu/h and...
Page 102 REFRIGERANT FLOW DIAGRAMS KUSXB601A Outdoor Units Figure 36: KUSXB601A Outdoor Unit Refrigerant Flow Diagram. Cond-out pipe Refrigerant Flow Air temperature temperature thermistor Cooling thermistor Heating Distributor Cond-mid pipe temperature thermistor Ø3/8 in. (Ø9.52 mm) Flare Connection Electronic Expansion Valve Electronic Expansion Valve Sub Cooler Electronic...
Page 103 REFRIGERANT FLOW DIAGRAMS A-Coil Units Figure 37: A-Coil Unit Refrigerant Flow Diagram. Cooling Heating Heat Exchanger A-Coil Unit Table 73: A-Coil Unit Piping Connections. A-Coil Model Nos. Field Piping Vapor (in. [mm]) Liquid (in. [mm]) 14.5 inch LKMMA18A1 Ø3/4 (Ø19.05) Ø3/8 (Ø9.52) 17.5 inch LKMMA18B1...
Page 104 0.43 0.43 Adapters for piping connections are shipped with the outdoor unit. System Layout Figure 39: Typical KSSMB18AA ~ KSSMB30BA System Layout. Figure 40: Typical KSSMB36BA ~ KSSMB60DA System Layout. Unit = Feet Unit = Feet Max Length = A...
Page 105 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.) KSSMB18AA (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 KSSMB18BA (18k) 0.38 24.6...
Page 106 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 107 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 108 REFRIGERANT PIPING SYSTEM ENGINEERING Table 79: 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 109 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 110 REFRIGERANT PIPING SYSTEM ENGINEERING Figure 42: 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 111 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 112 ELECTRICAL General Guidelines on page 113 Wiring Diagrams on page 114 LG Heat Pump ODU to Indoor Component Wiring System on page 119 ODU Communication Connections and DIP Switch Settings on page 121...
Page 113 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 114 WIRING DIAGRAMS KUSXB181A, KUSXB241A, KUSXB301A Outdoor Units Figure 47: KUSXB181A, KUSXB241A, KUSXB301A Outdoor Unit Wiring Diagram. Dedicated circuit is field supplied (sold separately). 1) Only when installing the furnace (thermostat), CN_FAN(WH) connect comm. line (BK) (WH) to “IDU B”, “IDU A”. CN_JIG_PC(WH) (The comm.
Page 115 WIRING DIAGRAMS KUSXB361A Outdoor Units Figure 48: KUSXB361A Outdoor Unit Wiring Diagram. Dedicated circuit is field supplied (sold separately). *Function can be optional or factory installed depending on the model. *Optional parts are sold separately. GN/YL 2 / 25 ©...
Page 116 WIRING DIAGRAMS KUSXB421A, KUSXB481A Outdoor Units Figure 49: KUSXB421A, KUSXB481A Outdoor Unit Wiring Diagram. Dedicated circuit is field supplied (sold separately). *Function can be optional or factory installed depending on the model. *Optional parts are sold separately. GN/YL 2 / 25 ©...
Page 117 WIRING DIAGRAMS KUSXB601A Outdoor Units Figure 50: KUSXB601A Outdoor Unit Wiring Diagram. Dedicated circuit is field supplied (sold separately). *Function can be optional or factory installed depending on the model. *Optional parts are sold separately. CN_PRESS_WH CN_JIG_PC(WH) 1) Only when installing the furnace (thermostat), connect comm.
Page 118 THE OUTDOOR UNIT Figure 51: Circuit Breaker. Outdoor Unit Circuit Breaker • LG single zone systems operate at 1Ø, 208-230V, 60Hz; confirm Main power source specifications. Power Source • Follow manufacturer’s circuit diagrams displayed on the inside of Switch Box the control box cover.
Page 119 LG HEAT PUMP OUTDOOR UNIT TO INDOOR COMPONENT WIRING SYSTEM Heat Pump Outdoor Unit with One-Stage Thermostats S – Indoor and Outdoor Wired Sensors Figure 53: Detailed One-Stage Wiring Diagram (For Illustrative Purposes Only). Leak Detection Sensor Wire R, C:...
Page 120 Terminal Block in Gas Furnace Y / Y2 - Compressor Stage 2 (Cooling): As the load increases further, LG inverter driven compressors will further increase the frequency to full load to overcome the increased load.
Page 121 OUTDOOR UNIT COMMUNICATION CONNECTIONS AND DIP SWITCH SETTINGS Heat Pump Outdoor Unit Communication Kit DIP Switch Setting Figure 55: DIP SWITCH SW-01 On Communication Kit PCB (Appearances May Vary). Figure 56: SW-01 DIP Switch Heat Pump Communication Kit Default Figure 57: SW-01 DIP Switch Heat Pump Communication Kit Setting for Setting (All Off).
Page 123 LG Electronics, U.S.A., Inc. Air Conditioning Technologies 4300 North Point Parkway EM_SZ_Standard_A-Coil_R32_05_25 Alpharetta, Georgia 30022 Supersedes: EM_SZ_Standard_A-Coil_R32_03_25 www.lghvac.com...

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