Page 1 SINGLE ZONE MID STATIC DUCTED STANDARD R32 SYSTEMS ENGINEERING MANUAL KSUJB091A (9,000 Btu/h) KSUJB181A (18,000 Btu/h) KSUJB301A (30,000 Btu/h) KSUJB121A (12,000 Btu/h) KSUJB241A (24,000 Btu/h KSUJB361A (36,000 Btu/h) KSSJB421A (42,000 Btu/h) KSSJB481A (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 (Lats)
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 LATS can generate an Excel GERP report that can be imported into the LG SOPS pricing and ordering system.
Page 5: Table Of Contents
Communication / Connection Cable ....................................111 Controllers .............................................112 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 6: Table Of Symbols
R32 Refrigerant LG Electronic split system heating and air conditioning (HVAC) products now contain R32 refrigerant. While R32 refrigerant is slightly flammable, it has a higher efficiency, a lower Global Warming Potential (GWP) value, and is more environmentally friendly than R32.
Page 7: Product Data
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 23 Outdoor Unit Dimensions on page 26 Outdoor Unit Center of Gravity / Corner Weight on page 29 Indoor Unit Dimensions on page 30 Air Flow, Temperature Distribution Graphs on page 33...
Page 8: Unit Nomenclature
1 to 9 9. Function A = 208~230V 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 9: Pairing Table
KSSJB421A (42,000 Btu/h) KSSJB481A (48,000 Btu/h) 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 10: Mechanical Specifications
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 11 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 12: General Data
Power Input is rated at high speed. 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 13 (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 14 Power Input is rated at high speed. 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 (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 16 Power Input is rated at high speed. 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 17 (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 18 Power Input is rated at high speed. 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 19 (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 20: Electrical Data
MCA = Minimum Circuit Ampacity. LRA = Locked Motor Amps 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 21: Functions, Controls, Options
3. *These functions require a wired remote controller. 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 22 2. (Accessory model name) : Installed in the field; ordered and purchased separately by model number; supplied in separate package. 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 23: Accessories
120W PQSH1200 Optional KUSXB361A, KUSXB421A, KUSXB481A 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 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 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 26: Outdoor Unit Dimensions
Figure 8: KUSXB091A, KUSXB121A Outdoor Unit Dimensions. 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 27: Kusxb181A, Kusxb241A, Kusxb301A
Figure 9: KUSXB181A, KUSXB241A, KUSXB301A Outdoor Unit Dimensions. 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 28: Kusxb361A, Kusxb421A, Kusxb481A
Figure 10: KUSXB361A, KUSXB421A, KUSXB481A Outdoor Unit Dimensions. 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 29: Outdoor Unit Center Of Gravity / Corner Weight
14 3/16 15.8 18.1 84.9 74.4 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 30: Indoor Unit Dimensions
Figure 12: KNUJB091A, KNUJB121A, KNUJB181A, KNUJB241A Indoor Unit Dimensions. 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 31: Knujb301A, Knujb361A
Figure 13: KNUJB301A, KNUJB361A Indoor Unit Dimensions. 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 32: Knujb421A, Knujb481A
Figure 14: KNUJB421A, KNUJB481A Indoor Unit Dimensions. 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 33: Air Flow
• Table data is based at 230V. Air flow rate varies according to voltage fluctuation. 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 34: Acoustic Data
8000 Octave Band Center Frequency (Hz) 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 35: Sound Power For Outdoor Units
Octave Band Center Frequency (Hz) Octave Band Center Frequency (Hz) 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 36: Sound Pressure For Indoor Units
Figure 19: Mid Static Ducted Indoor Unit Sound Pressure Level Diagrams. KNUJB121A KNUJB091A 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 37 Octave Band Center Frequency (Hz) Octave Band Center Frequency (Hz) 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 38 Figure 21: Mid Static Ducted Indoor Unit Sound Pressure Level Diagrams. KNUJB481A KNUJB421A 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 39: Sound Power For Indoor Units
41.7 38.2 32.0 22.4 14.6 44.0 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 40 46.0 44.8 38.8 29.5 18.3 49.0 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 41: Performance Data
PERFORMANCE DATA Cooling Capacity on page 42 Maximum Cooling Capacity on page 50 Heating Capacity on page 58 Maximum Heating Capacity on page 66 Correction Factors on page 74 Check Selection on page 75...
Page 42 / or safety interruption. 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 43 / or safety interruption. 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 44 / or safety interruption. 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 45 / or safety interruption. 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 46 / or safety interruption. 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 47 / or safety interruption. 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 48 / or safety interruption. 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 49 / or safety interruption. 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 50 / or safety interruption. 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 51 / or safety interruption. 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 52 / or safety interruption. 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 53 / or safety interruption. 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 54 / or safety interruption. 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 55 / or safety interruption. 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 56 / or safety interruption. 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 57 / or safety interruption. 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 58 2. Direct interpolation is permissible. Do not extrapolate. 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 59 2. Direct interpolation is permissible. Do not extrapolate. 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 60 2. Direct interpolation is permissible. Do not extrapolate. 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 61 2. Direct interpolation is permissible. Do not extrapolate. 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 62 2. Direct interpolation is permissible. Do not extrapolate. 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 63 2. Direct interpolation is permissible. Do not extrapolate. 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 64 2. Direct interpolation is permissible. Do not extrapolate. 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 65 2. Direct interpolation is permissible. Do not extrapolate. 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 66 2. Direct interpolation is permissible. Do not extrapolate. 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 67 2. Direct interpolation is permissible. Do not extrapolate. 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 68 2. Direct interpolation is permissible. Do not extrapolate. 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 69 2. Direct interpolation is permissible. Do not extrapolate. 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 70 2. Direct interpolation is permissible. Do not extrapolate. 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 71 2. Direct interpolation is permissible. Do not extrapolate. 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 72 2. Direct interpolation is permissible. Do not extrapolate. 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 73 2. Direct interpolation is permissible. Do not extrapolate. 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 74: Correction Factors
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 75: Defrost Correction Factor For Heating Operation
• Verify that the sensible load of the zone is satisfied. 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 76: Application Guidelines
APPLICATION GUIDELINES Placement / Clearance Considerations for Indoor Units on page 77 Placement / Clearance Considerations for Outdoor Units on page 78 Installing Outdoor Units Indoors on page 85...
Page 77: Placement / Clearance Considerations
The unit will be damaged, will malfunction, and / or will not operate as designed if installed in any of the conditions listed. 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 78 Also, add a ceiling grille for ventilation. 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 79: Outdoor Units
XX for information in reference to outdoor unit placement. 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 80: Planning For Snow And Ice
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 81: Oceanside Applications
Additional anti-corrosion treatment may need to be applied to the outdoor unit at oceanside locations. 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 82 Case 4 Minimum Standard Case 5 Minimum 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 83 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. Single Unit—High Rear and Front Walls...
Page 84 Minimum 24" Minimum 24" Minimum 40" 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 85: Installing Outdoor Units Indoors
• Discharge and supply ductwork must be designed to avoid weather related long periods of water entrainment and the potential for microbial growth. 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 86 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 87 /min. = 89.9% (Within Allowable Limits) 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 88: Refrigerant Piping Design
REFRIGERANT PIPING DESIGN Refrigerant Flow Diagrams on page 89 Connection Limitations and System Layout on page 93 Additional Refrigerant Charge on page 94 Refrigerant Piping System Engineering on page 95...
Page 89: Refrigerant Flow Diagrams
Pressure Sensor CN9_RD Pressure Switch CN_PRESS(HW) 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 90: Outdoor Units Kusxb181A, Kusxb241A, Kusxb301A, Kusxb361A, Kusxb421A, Kusxb481A
Pressure Sensor CN9_RD Pressure Switch CN_PRESS_SW 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 91: Indoor Units Knujb091A, Knujb121A , Knujb181A , Knujb241A
*Refer to the image at right for KNUJB181A socket connections. Flare side to outdoor unit 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 92: Indoor Units Knujb301A, Knujb361A, Knsjb421A, Knsjb481A
Liquid (inch) KNUJB301A, KNUJB361A, KNSJB421A, KNSJB481A 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 93: Connection Limitations / System Layout
Indoor unit Outdoor unit Outdoor unit 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 94: Additional Refrigerant Charge
246 feet. This will prevent any interruptions to unit operation and possible damage. 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 95: 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 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: Copper Expansion And Contraction
4. Calculate the difference in the two expansion distance values. The result will be the change in pipe length. 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 97 L = Centerline Minimum Radius (inches). 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 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: Pipe Supports
Use a 4" + long sheet curved sheet metal saddles between hanger bracket and insulation to promote linear expansion/contraction. 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 100: 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 101: Electrical
ELECTRICAL General Guidelines on page 102 Wiring Diagrams on page 103 Power Supply / Power Wiring on page 110 Communication / Connection Cable on page 111 Controllers on page 112...
Page 102: General Guidelines
Do not allow wire to touch refrigerant piping, the compressor or any moving parts since it can lead to mechanical failure. 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 103: Wiring Diagrams
*Dedicated circuit is field supplied. MEZ68866125_Rev.02 061324 8 / 24 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 104: Outdoor Units Kusxb181A, Kusxb241A, Kusxb301A
To be connected to A/Coil / Furnace only. 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 105: Outdoor Units Kusxb361A, Kusxb421A, Kusxb481A
To be connected to A/Coil / Furnace only. 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 106: Indoor Units Knujb091A, Knujb121A , Knujb181A , Knujb241A
Figure 56: KNUJB091A, KNUJB121A , KNUJB181A , KNUJB241A Indoor Units Wiring Diagram. MEZ65014865 Rev.01 051024 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 107: Indoor Units Knujb301A,Knujb361A, Knsjb421A, Knsjb481A
Figure 57: KNUJB301A,KNUJB361A, KNSJB421A, KNSJB481A Indoor Units Wiring Diagram. 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 108: Indoor Unit Wiring Diagram Legend
Auxiliary Heater Relay Kit Second stage heat 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 109 • SW5 OFF: Fan discontinuous operation. There would be reduction in heating capacity while defrosting or oil return operation. 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 110: Power Supply / Power Wiring
1Φ, 208/230 V, 60 Hz Power Wiring (Including Ground) 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 111: Communication / Connection Cable
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 112: 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 113 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 114: Limited Warranty (Usa)
The product’s full Limited Warranty terms and conditions and arbitration re- quirements are available at https://www.lghvac.com. 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 115 LG Electronics, U.S.A., Inc. Air Conditioning Technologies 4300 North Point Parkway Alpharetta, Georgia 30022 EM_SZ_MidStaticDucted_R32_1_25 www.lghvac.com...

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