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