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Home > Air Conditioners > Mini Split Air Conditioners > KSSJA421A
LG KSSJA421A - 42,000 BTU Single Zone Mini Split System
LG KSSJA421A - 42,000 BTU Single Zone Mini Split System
LG KSSJA421A - 42,000 BTU Single Zone Indoor Mid Static Ducted Unit

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LG KSSJA421A
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Dealer

LG
KSSJA421A
42,000 BTU Single Zone Mini Split System 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
48,000 BTU Single Zone Outdoor Mid Static Ducted Unit (KUSXA421A)
• Internal Condensate Pump, Auto Restart, Night Quiet Operation
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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: KUSXA421A
Dimensions & Weights
Width: 37 19/48 Inch
Depth: 13 Inch
Height: 54 17/48 Inch
Net Weight: 212 Lbs.
Shipping Weight: 235 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°): 5-118
Thermostat Range - Heating (F°): -13-64
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 Quiet (CFM): 988 CFM
Airflow Rate Medium (CFM): 1,200 CFM
Airflow Rate High (CFM): 1,412 CFM
Operating Sound Level - Low (dB): 54 dB
Operating Sound Level - High (dB): 56 dB
Temperature Sensor: Thermistor
Piping Connections
Power and Communication Cable - No.: 4
Power and Communication Cable - AWG: 14
Refrigeration System
Refrigerant Type: R-32
Refrigerant Control: EEV
Features
Program Timer: Yes
Sleep Mode: Yes
Self-diagnosis: Yes
Soft Start: Yes
Quiet/Sleep Mode: Yes
Auto-changeover: Yes
4-Way Swing: Yes
WiFi Connected: Yes
Technical Details
ADA Compliant: No
CSA Sustainability Compliant: No
Voltage: 230/208 Volts
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Description

48,000 BTU Single Zone Outdoor Mid Static Ducted Unit
The 48,000 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
ODU Sound Pressure (H/M/L) (±1 dB[A])3:  
54/56
ODU Net / Shipping Weight (lbs.):  
212.5 / 235.9
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
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:  
212 lb.

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
BTU Calculator