DC Inverter MULTI-SYSTEM AIR Conditioner
Safety Precautions
Prohibit
Table of Contents
Appendix a
Semi-Concealed Type
Wall Mounted Type
Operating Range
Duct Less Type Rated 230V
Unit Specifications
Outdoor Unit CU-3KE19NBU
Indoor Unit CS-MKE9NKU ×
Indoor Unit
Outdoor Unit
208V
CU-4KE24NBU
Running Amperes 10.1
Running Amperes 10.0 11.1
CU-4KE31NBU
Running Amperes 12.3 10.3
Running Amperes 12.7 11.4
Outdoor Unit
Major Component Specifications
Outdoor Unit CU-4KE24NBU
Outdoor Unit CU-4KE31NBU
CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU
Other Component Specifications
Dimensional Data
Unit inchmm 852-0-0010-20400-0
Unit inchmm 852-0-0010-20300-0
Refrigerant Flow Diagram
Insulation of Refrigerant Tubing
Indoor unit Outdoor unit
Valve Narrow tube
Curve because it can cause the tube to break or crack
Temperature Charts
Temperature Charts CU-3KE19NBU
Indoor Unit CS-MKE7NKU ×
F21
Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NKU ×
Heating Characteristics
Indoor Unit CS-MKE18NKU ×
Indoor Unit CS-MKE9NB4U ×
Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NB4U ×
Indoor Unit CS-KE12NB4UW ×
Temperature Charts CU-4KE24NBU
188 Lo fan Hi fan HH fan
Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NKU ×
Indoor Unit CS-MKE18NKU ×
Indoor Unit CS-MKE24NKU ×
23C 73F Current 21C Temp 70F 17C Air Indoor 63F
Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NB4U ×
Indoor Unit CS-KE12NB4UW ×
Temperature Charts CU-4KE31NBU
Wide 362 Pressure 290 High 218 Outdoor air temperature F C
73F 23C Temp
Indoor 73F 23C Air Temp
86F 30C Temp
Air Indoor 63F
Wide 362
Current
Indoor Outdoor
Cooling Capacity
CS-MKE12NB4U ×
Power Supply 230V Single Phase 60Hz Cooling Capacity
CS-MKE9NKU ×
CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U
30,600 BTU/h
CS-MKE9NB4U ×
Cooling Capacity Low Ambient
TC Total Cooling Capacity BTU/h
ENT. TEMP. o F o C Ambient TEMP. o F o C 12.8 23,390 23,310
18,570 22,160
24,260 30,760
22,560 28,790 22,730
TH Total Heating Capacity BTU/h
Heating Capacity
Power Supply 230V Single Phase 60Hz Heating Capacity
29,200 BTU/h
28,400 BTU/h
32,000 BTU/h
000 CFM
Outdoor Unit CU-3KE19NBU 8FA2-5251-11700-1
Electric Wiring Diagrams
Outdoor Unit CU-4KE24NBU 8FA2-5251-11500-1
Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1
Explanation of Functions
Functions
Stop
Cool
Frequency control
Fluctuation fan
Fluctuation fan
Low Ambient Cooling Operation
Non-stop defrosting
Clean defrost
Protective Functions
Defrost Detection and Release
Current control
Current Control
Description of function
Automatic frequency control
Control at Heat Start-up
Compressor Temperature Control
Reset conditions
Low Start Current
Precautions before Performing Inspection or Repair
Troubleshooting Before Calling for Service
Trouble Diagnosis by Error Monitor Lamps
Location of the Error Monitor Lamps
Display of the Error Monitor Lamps
Checking the defrost operation
Work procedure Check items unit operation
Checking the Outdoor System
Checking the outdoor unit
Trouble Diagnosis of Each Part
Problems of Each Part and Inspection Points
Inspection Points for Each Part
CU-3KE19NBU MV0 MV1 MV2 CU-4KE24NBU CU-4KE31NBU
Electric expansion valve
Branch tubing temperature sensor
Breaker
Refrigerant gas pressure
Trouble Diagnosis of Fan Motor
Diagnostic procedure
Diagnostic results
Remedy for symptom 3 to
Components mixing proportions
Characteristics of New Refrigerant R410A
What is New Refrigerant R410A?
Characteristics
Checklist before Servicing
Tools Specifically for R410A
Tubing Installation Procedures
Case of Compressor Malfunction
Procedure for Replacing Compressor
R410A from changing
Amount in the charging cylinder is less than 20%
Example
To prevent the composition
Case Refrigerant is Leaking
Welding leaking points
Recharging
Use of Existing Units
When Tubes are Extended
Charging Additional Refrigerant
Retro-Fitting Existing Systems
Page
852-6-4190-584-00-2
For Outdoor Unit
Contents
Please Read Before Starting
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Fins of the outdoor unit. You may get injured
General
For ceiling-mounted cassette units
Installation Site Selection
Indoor Unit
For wall-mounted units
H1, H2, H3, H4
Connecting Indoor Units
Connecting indoor unit for CU-3KE19NBU
Connecting indoor unit for CU-4KE24NBU
815.88mm Locally purchased
Connecting indoor unit for CU-4KE31NBU
CS-MKE24NKU
Back
Baffle Plate for the Outdoor Unit
It is recommended to use baffle plates
Front
Air Discharge Baffle
Air Intake Baffle
Precautions for installation
CU-4KE31NBU
Outer Dimensions of Outdoor Unit
CU-3KE19NBU
CU-4KE24NBU
Never install only a single indoor unit
Diagram of Outdoor Unit Installation
Installation Process
Flaring Procedure with a Flare Tool
Use of the Flaring Method
Tubing Connections
To 0.5 mm Adjust so that the amount of tube
For ceiling-mounted cassette units
Insulation of Refrigerant Tubing
To prevent heat loss and wet floors due to dripping of con
For wall-mounted units
Finishing the Installation
Air Purging
Air Purging with a Vacuum Pump for Test Run
Adapter manual, and use the adapter correctly
External diameter of service port R410A 5/16
If pump-down is not possible
What is pump-down?
Pump-down procedure
Pump Down
Wiring Instructions
General Precautions on Wiring
Recommended Wire Length and Diameter
Disconnect switch may be required by national or local codes
For Indoor Unit
How to connect wiring to the terminal
For Outdoor Unit For solid core wiring or F-cable
For stranded wiring
Indoor unit C
Wiring Instructions for the Outdoor Unit
Indoor unit D
Indoor unit B
Checking tubing and wiring
Test Run
Performing a test run
Installation Check Sheet
Connecting a Home Automation Device
DC1111-0