Contents
DC Inverter MULTI-SYSTEM AIR Conditioner
Safety Precautions
Prohibit
Table of Contents
Appendix a
Wall Mounted Type
Semi-Concealed Type
Operating Range
Unit Specifications
Outdoor Unit CU-3KS19NBU
Indoor Unit CS-MKS9NKU ×
Duct Less Type Rated
Outdoor Unit
Indoor Unit
208V
CU-4KS24NBU
BTU/h/W Compressor Locked Rotor Amperes
20,600
CU-4KS31NBU
Indoor Unit CS-MKS9NKU 4units Outdoor Unit CU-4KS31NBU 1unit
24,200
Major Component Specifications
Outdoor Unit
Outdoor Unit CU-4KS24NBU
Outdoor Unit CU-4KS31NBU
Other Component Specifications
CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU
Dimensional Data
Unit inchmm 852-0-0010-20500-0
Unit inchmm 852-0-0010-20600-0
Refrigerant Flow Diagram
Insulation of Refrigerant Tubing
Indoor unit
Outdoor unit
Indoor unit Outdoor unit
1/4 Strainer Header Sub Main Compressor Accumulator
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS7NKU ×
Temperature Charts
Temperature Charts CU-3KS19NBU
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NKU ×
Cooling Characteristics
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS12NKU ×
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS18NKU ×
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NB4U ×
Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS12NB4U ×
Outdoor Unit CU-3KS19NBU Indoor Unit CS-KS18NB4UW ×
Temperature Charts CU-4KS24NBU
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS7NKU ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS9NKU ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NKU ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS18NKU ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS24NKU ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS9NB4U ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NB4U ×
Outdoor Unit CU-4KS24NBU Indoor Unit CS-KS18NB4UW ×
Temperature Charts CU-4KS31NBU
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS9NKU ×
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NKU ×
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS18NKU ×
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS24NKU ×
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS9NB4U ×
Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NB4U ×
Outdoor Unit CU-4KS31NBU Indoor Unit CS-KS18NB4UW ×
Cooling Capacity
Indoor Outdoor
Power Supply 230V Single Phase 60Hz Cooling Capacity
CS-MKS12NB4U ×
CS-MKS9NKU ×
CS-KS18NB4UW + CS-MKS12NB4U + CS-MKS12NB4U
30,600 BTU/h
CS-MKS9NB4U ×
Cooling Capacity Low Ambient
15,180 18,570
19,250 25,420 19,410
19,360 24,830 19,520
24,260 30,760
22,560 28,790 22,730
Electric Wiring Diagrams
Outdoor Unit CU-3KS19NBU 8FA2-5251-11800-1
Outdoor Unit CU-4KS24NBU 8FA2-5251-11600-1
Outdoor Unit CU-4KS31NBU 8FA2-5251-11400-1
Functions
Explanation of Functions
Cool
Fluctuation fan
DRY
Low Ambient Cooling Operation
Protective Functions
Current Control
Description of function
Automatic frequency control
Current control
Compressor Temperature Control
Low Start Current
Troubleshooting Before Calling for Service
Precautions before Performing Inspection or Repair
Display of the Error Monitor Lamps
Trouble Diagnosis by Error Monitor Lamps
Location of the Error Monitor Lamps
Checking the outdoor unit
Work procedure Check items unit operation
Checking the Outdoor System
Problems of Each Part and Inspection Points
Trouble Diagnosis of Each Part
Inspection Points for Each Part
Outdoor control circuit board
Fuse
Compressor
Electric expansion valve
CU-3KS19NBU MV0 MV1 MV2 CU-4KS24NBU MV3 CU-4KS31NBU
Refrigerant gas pressure
Branch tubing temperature sensor
Breaker
Diagnostic procedure
Diagnostic results
Remedy for symptom 3 to
Trouble Diagnosis of Fan Motor
Characteristics of New Refrigerant R410A
What is New Refrigerant R410A?
Characteristics
Components mixing proportions
Checklist before Servicing
Tubing Installation Procedures
Tools Specifically for R410A
Procedure for Replacing Compressor
Case of Compressor Malfunction
Amount in the charging cylinder is less than 20%
Example
To prevent the composition
R410A from changing
Recharging
Case Refrigerant is Leaking
Welding leaking points
When Tubes are Extended
Charging Additional Refrigerant
Retro-Fitting Existing Systems
Use of Existing Units
852-6-4190-581-00-1
Contents
For Outdoor Unit
Please Read Before Starting
Fins of the outdoor unit. You may get injured
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General
For ceiling-mounted cassette units
Installation Site Selection
For wall-mounted units
H1, H2, H3, H4
Connecting indoor unit for CU-4KS24NBU
Connecting Indoor Units
Connecting indoor unit for CU-3KS19NBU
815.88mm Locally purchased
Connecting indoor unit for CU-4KS31NBU
CS-MKS24NKU
Baffle Plate for the Outdoor Unit
It is recommended to use baffle plates
Front
Back
Air Intake Baffle
Air Discharge Baffle
Precautions for installation
Outer Dimensions of Outdoor Unit
CU-3KS19NBU
CU-4KS24NBU
CU-4KS31NBU
Diagram of Outdoor Unit Installation
Never install only a single indoor unit
Use of the Flaring Method
Installation Process
Flaring Procedure with a Flare Tool
To 0.5 mm Adjust so that the amount of tube
Tubing Connections
Insulation of Refrigerant Tubing
To prevent heat loss and wet floors due to dripping of con
For wall-mounted units
For ceiling-mounted cassette units
Air Purging with a Vacuum Pump for Test Run
Finishing the Installation
Air Purging
External diameter of service port R410A 5/16
Adapter manual, and use the adapter correctly
What is pump-down?
Pump-down procedure
Pump Down
If pump-down is not possible
Recommended Wire Length and Diameter
Wiring Instructions
General Precautions on Wiring
Disconnect switch may be required by national or local codes
How to connect wiring to the terminal
For Outdoor Unit For solid core wiring or F-cable
For stranded wiring
For Indoor Unit
Wiring Instructions for the Outdoor Unit
Indoor unit D
Indoor unit B
Indoor unit C
Performing a test run
Checking tubing and wiring
Test Run
Connecting a Home Automation Device
Installation Check Sheet
DC1111-0