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Home > Air Conditioners > Mini Split Air Conditioners > KSSJB421A
LG KSSJB421A - 42,000 BTU Single Zone Mini Split Unit
LG KSSJB421A - 42,000 BTU Single Zone Mini Split Unit
LG KSSJB421A - 42,000 BTU Single Zone Indoor Mid Static Ducted Unit
LG KSSJB421A - 46,000 BTU Single Zone Outdoor LGRED™ Multi-Position Air Handling Unit with R32 Leak Detection Sensor
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LG KSSJB421A
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Dealer

LG
KSSJB421A
42,000 BTU Single Zone Mini Split Unit with Internal Condensate Pump, Auto Restart, Night Quiet Operation, Swirl Wind, and Inverter Variable Speed Compressor

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included items
42,000 BTU Single Zone Indoor Mid Static Ducted Unit (KNSJB421A)
• Internal Condensate Pump, Auto Restart, Night Quiet Operation
46,000 BTU Single Zone Outdoor LGRED™ Multi-Position Air Handling Unit wi (KUSXB421A)
• R32 Leak Detection Sensor, Self Diagnosis, Soft Dry Operation
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800-570-3355
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Product Information
Brand: LG
Series: Multi F LG RED
Model: KNSJB421A
Dimensions & Weights
Width: 49 7/32 Inch
Depth: 24 3/8 Inch
Height: 14 3/16 Inch
Net Weight: 96.6 Lbs.
Shipping Weight: 110.7 Lbs.
Capacity
Heating Capacity: 48,000 BTU
Cooling Capacity: 42,000 BTU
General
AC System Type: Mini Split
Component Type: Indoor Unit
Thermostat Range - Cooling (F°): 57-77
Thermostat Range - Heating (F°): 59-81
Electrical Data
Power Source V / Hz / Ø: (208/230/60/1)
Performance
Fan: Sirocco
Motor: Brushless Digitally Controlled
Energy Star Certified: Yes
Moisture Removal (Pts/hr): 7.9 Pts./Hr.
Airflow Rate Low (CFM): 988 CFM
Airflow Rate Medium (CFM): 1,200 CFM
Airflow Rate High (CFM): 1,412 CFM
Operating Sound Level - Quiet (dB): 36 dB
Operating Sound Level - Low (dB): 38 dB
Operating Sound Level - Medium (dB): 39 dB
Piping Connections
Power and Communication Cable - No.: 4
Power and Communication Cable - AWG: 14
Refrigeration System
Refrigerant Type: R-32
Refrigerant Control: EEV
Piping Length (No Additional Refrigerant): 24.6 Ft.
Min. Line Length - Each: 16.4 Ft.
Max. Line Length - Total: 246 Ft.
Features
Auto Restart on Power Failure: Yes
Auto-changeover: Yes
No. of Fan Speeds: 3
Technical Details
ADA Compliant: No
Voltage: 230/208 Volts
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Description

42,000 BTU Single Zone Indoor Mid Static Ducted Unit
The 42,000 BTU Single Zone Indoor Mid Static Ducted LGRED° with Internal Condensate Pump from LG offers powerful, efficient heating and cooling for large spaces. Featuring LGRED° (Reliable to Extreme Degrees) technology, it delivers superior performance even in extreme cold climates. The mid static ducted design ensures flexible installation, while the internal condensate pump simplifies drainage. Ideal for both residential and light commercial applications, this unit combines advanced climate control with quiet operation and energy efficiency.

Specifications

Performance
Cooling Capacity:  
42,000
SEER2:  
18.80
EER2:  
12.60
Heating Capacity:  
48,000
HSPF2:  
9.40
Electrical
Power Supply (V¹/Hz/Ø):  
208-230/60/1
MOP (A):  
40
MCA (A):  
32
Cooling / Heating Rated Amps (A):  
27.7
Compressor (A):  
22
Fan Motor (IDU + ODU) (A):  
2.5 + (1.6 x 2)
Cooling Power Input (Min~Rated~Max, kW):  
1.19 ~ 3.33 ~ 5.30
Heating Power Input (Min~Rated~Max, kW):  
1.34 ~ 4.04 ~ 5.92
Locked Rotor Amps (A):  
22
Piping
Installed Liquid Line (in., O.D.):  
3/8
Installed Vapor Line (in., O.D.):  
5/8
IDU Liquid Connection (in., O.D.):  
3/8
IDU Vapor Connection (in., O.D.):  
5/8
Additional Refrigerant (oz./ft.):  
0.43
Min. / Max. Pipe Length (ft.)²:  
16.4 / 246
Piping Length (no add’l refrig., ft.):  
24.6
Max. Elevation (ft.):  
98.4
Operating Range Indoor Unit
Cooling (°F DB):  
57 ~ 77
Heating (°F WB):  
59 ~ 81
System Data
Refrigerant Type:  
R32
Refrigerant Control:  
EEV
Refrigerant Charge (lbs.):  
7.5
IDU Sound Pressure (H/M/L) (±1 dB[A])3:  
39 / 38 / 36
IDU Net / Shipping Weight (lbs.):  
96.6 / 110.7
Heat Exchanger Coating:  
GoldFin™
Fan
IDU Type:  
Sirocco
Fan Speeds (Fan/Cool/Heat):  
3 / 3 / 3
Quantity (ODU + IDU):  
2 + 1
Motor/Drive:  
Brushless Digitally Controlled/Direct
IDU Air Flow (CFM Max. H/M/L):  
1412 / 1200 / 988
Default ESP (in wg):  
0.24
Minimum ESP/Fan Setting Value⁴:  
0.16 / 74
Maximum ESP/Fan Setting Value⁴:  
0.59 / 116
Dehumidification (pts./hr.):  
7.9
Dimension and Weight
Width:  
49 7/32”
Depth:  
24 3/8“
Height:  
14 3/16“
Weight:  
96.6 lbs.

Features

Internal Condensate Pump
  • Efficiently manages condensate drainage, allowing for flexible installation options and reducing maintenance needs.
Auto Restart
  • Automatically restores previous settings and resumes operation after a power outage, ensuring consistent comfort.
Night Quiet Operation
  • Minimizes noise levels during nighttime, providing a quieter and more comfortable environment for rest.
Swirl Wind
  • Enhances air circulation with multidirectional airflow, promoting even temperature distribution throughout the room.
Inverter Variable Speed Compressor
  • Optimizes energy efficiency and maintains consistent temperatures by adjusting compressor speed based on demand.
Other Features
  • Internal Condensate Pump
  • Jet Cool / Jet Heat
  • Auto Changeover
  • Optional Wi-Fi Control
  • Drain Pan Heater
  • Direct / Indirect Wind
  • Smart Mode
  • Refresh Mode
  • Aux Heater Relay Kit
California residents see Prop 65 WARNINGS

Reviews

Manuals & Guides

Specification Sheet
Product Information
Brand: LG
Model: KUSXB421A
Dimensions & Weights
Width: 37 13/32 Inch
Depth: 23 27/32 Inch
Height: 54 11/32 Inch
Net Weight: 190.2 Lbs.
Shipping Weight: 214.3 Lbs.
Capacity
Heating Capacity: 46,000 BTU
Cooling Capacity: 42,000 BTU
Min Connectable Capacity: 18,000 BTU
Max Connectable Capacity: 51,800 BTU
General
AC System Type: Mini Split
Component Type: Outdoor Unit
Operation: Cooling with Heat Pump
Electrical Data
Power Source V / Hz / Ø: (208/230/60/1)
Minimum Ampacity (Amps): 40 Amps
Max. TD Fuse/Breaker: 32 Amps
Performance
Compressor Noise Level - Cooling (dB): 36 dB
Compressor Noise Level - Heating (dB): 56 dB
Energy Star Certified: Yes
Piping Connections
Power and Communication Cable - No.: 4
Power and Communication Cable - AWG: 14
Refrigeration System
Refrigerant Type: R-32
Refrigerant Control: EEV
Piping Length (No Additional Refrigerant): 24.6 Ft.
Min. Line Length - Each: 16.4 Ft.
Max. Line Length - Total: 246 Ft.
Max. Height Diff. btwn. Indoor and Outdoor Units: 98.4 Ft.
Outside Temperature Range for Cooling - Min.: 5 °F
Outside Temperature Range for Cooling - Max.: 118 °F
Outside Temperature Range for Heating - Min.: -4 °F
Outside Temperature Range for Heating - Max.: 64 °F
Features
Sleep Mode: Yes
Inverter (Variable speed compressor): Yes
No. of Fan Speeds: 3
Technical Details
ADA Compliant: No
Voltage: 230/208 Volts
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Description

46,000 BTU Single Zone Outdoor LGRED™ Multi-Position Air Handling Unit with R32 Leak Detection Sensor
The 46,000 BTU Single Zone Outdoor LGRED™ Multi-Position Air Handling Unit with R32 Leak Detection Sensor from LG delivers robust heating and cooling for residential and light commercial applications. Featuring LGRED° (Reliable to Extreme Degrees) technology, it ensures exceptional performance even in extreme cold conditions. The multi-position design allows flexible installation, while the R32 refrigerant with leak detection enhances safety and environmental sustainability. Ideal for maintaining year-round comfort and energy efficiency.

Specifications

Performance
Cooling Capacity:  
42,000
SEER2:  
18
EER2:  
11.70
Heating Capacity:  
46,000
HSPF2:  
9.50
Electrical
Power Supply (V¹/Hz/Ø):  
208-230/60/1
MOP (A):  
40
MCA (A):  
32
Cooling / Heating Rated Amps (A):  
15.8 / 17.6
Compressor (A):  
22
Fan Motor (IDU + ODU) (A):  
3.4 + (1.6 x 2)
Cooling Power Input (Min~Rated~Max, kW):  
1.35 ~ 3.59 ~ 5.30
Heating Power Input (Min~Rated~Max, kW:  
1.45 ~ 4.01 ~ 5.17
Locked Rotor Amps (A):  
22
Piping
Liquid Line (in., O.D.):  
3/8
Vapor Line (in., O.D.):  
5/8
IDU Liquid Connection (in., O.D.):  
3/8
IDU Vapor Connection (in., O.D.):  
5/8
Additional Refrigerant (oz./ft.):  
0.43
Min. / Max. Pipe Length (ft.)²:  
16.4 / 264
Piping Length (no add’l refrig., ft.):  
24.6
Max. Elevation (ft.):  
98.4
Operating Range Outdoor Unit
Cooling (°F DB):  
5 ~ 118
Heating (°F WB):  
-4~ +64
System Data
Refrigerant Type:  
R32
Refrigerant Control:  
EEV
Refrigerant Charge (lbs.):  
106
ODU Sound Pressure
(Cooling / Heating) (±1 dB[A])⁵:  
54 / 56
ODU Net / Shipping Weight (lbs.):  
190.2 / 214.3
Heat Exchanger Coating:  
GoldFin™
Fan
ODU Type:  
Propeller
Fan Speeds (Fan/Cool/Heat):  
3 / 3 / 3
Quantity (ODU + IDU):  
2 + 1
Motor/Drive:  
Brushless Digitally Controlled/Direct
Maximum ODU Air Volume (CFM):  
1,942 x 2
IDU Air Flow (CFM Max. H/M/L):  
1,225 / 1,100 / 1,000
Default ESP (in wg):  
0.4
Minimum ESP/Fan Setting Value⁶:  
0.1 / 56
Maximum ESP/Fan Setting Value⁶:  
1.0 / 116
Dehumidification (pts./hr.):  
7.9
Dimension and Weight
Width:  
37 13/32“
Depth:  
23 27/32“
Height:  
54 11/32
Weight:  
190.2 lbs.

Features

R32 Leak Detection Sensor
  • Monitors refrigerant levels and alerts you to potential leaks, enhancing safety and efficiency.
Auto Restart
  • Automatically resumes operation with previous settings after a power outage, ensuring uninterrupted comfort.
Sleep Mode
  • Gradually adjusts temperature for a comfortable sleep environment while conserving energy.
Timer (on/off/weekly)
  • Allows you to schedule heating or cooling to match your routine, optimizing convenience and energy use.
Two Thermistor Control
  • Ensures precise temperature management by monitoring indoor conditions for consistent comfort.
Child Lock
  • Prevents accidental setting changes, providing safety and peace of mind for families.
Other Features
  • Inverter (Variable Speed Compressor)
  • Hot Start
  • Self Diagnosis
  • Soft Dry Operation
  • Auto Changeover
  • Auto Operation
  • Optional Wi-Fi Control
  • ESP Control
California residents see Prop 65 WARNINGS

Reviews

Manuals & Guides

Specification Sheet
BTU Calculator