Panasonic CU-4KS31NBU service manual 24,200

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Outdoor Unit

CU-4KS31NBU

 

 

 

Indoor Unit

CS-MKS9NKU × 4

 

 

< 208V >

 

 

 

 

 

 

 

 

Type

 

 

 

 

4-Room Multi Outdoor Unit

 

 

 

 

 

 

 

Number of Connectable Indoor Units

 

 

4

 

 

 

 

 

 

 

Number of Operatable Indoor Units

 

 

4

 

 

 

 

 

 

 

Voltage Rating

 

 

 

208V Single-Phase 60Hz

 

 

 

 

 

 

 

 

 

Performance

 

 

 

 

 

 

Cooling

 

 

 

 

 

 

 

Total Capacity

 

 

BTU/h

28,600

( 9,800 to 28,600 )

 

 

 

 

 

 

 

 

 

 

kW

8.40

( 2.90 to 8.40 )

 

 

Sensible Capacity

BTU/h

 

24,200

 

 

Latent Capacity

BTU/h

 

4,400

 

 

Air Circulation

(High)

ft3/min (m3/h)

 

1,942 (3,300)

Rating

Available Voltage Range

V

 

187 to 253

Power Input

 

 

 

W

 

2,560

 

 

Running Amperes

A

 

12.7

Electrical

 

 

 

 

 

 

 

Power Factor

 

 

%

 

99

 

 

 

 

 

 

 

EER

 

 

 

BTU/h/W

 

11.2

 

 

Compressor Locked Rotor Amperes

A

 

17.0

 

 

Fuse or Circuit Breaker Capacity

A

 

20

 

 

 

 

 

 

 

 

Outdoor Unit

 

 

 

 

 

 

 

 

 

 

Control

 

 

 

 

Microprocessor

 

 

Fan Speeds

 

 

 

 

Auto (Hi, Me, Lo)

Features

Compressor

 

 

 

 

DC Twin Rotary (Inverter)

Refrigerant / Amount charged at shipment

Ibs (g)

R410A / 8.38 (3,800)

 

 

 

 

Refrigerant Control

 

Electric Expansion Valve

 

 

Operation Sound (High) Cool

dB-A

 

53

 

 

Refrigerant Tubing Connections

 

 

Flare Type

 

 

Max. allowable tubing length per unit

ft (m)

 

100 (30.5)

 

 

Refrigerant

 

 

Narrow tube

inch (mm)

 

1/4 (6.35) × 4

 

 

Tube Diameter

 

Wide tube

inch (mm)

3/8 (9.52) × 2 + 1/2 (12.7) × 2

Weight

 

 

 

 

 

 

Outdoor Unit

 

 

 

 

 

 

 

 

 

 

Unit Dimensions

inch

35-1/32 × 35-7/16 × 12-19/32

&

 

Height × Width × Depth

(mm)

(890 × 900 × 320)

 

Package Dimensions

inch

40-1/8 × 41-11/32 × 16-21/32

Dimensions

Shipping Volume

cu.ft (m3)

 

15.88 (0.45)

 

 

Height × Width × Depth

(mm)

(1,019 × 1,050 × 423)

 

 

Weight

 

 

Net

Ibs (kg)

 

174.2 (79.0)

 

 

 

 

 

Shipping

Ibs (kg)

 

183.0 (83.0)

 

 

 

 

 

 

 

 

 

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Remarks:

1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual.

Indoor Unit : CS-MKS9NKU 4units

Outdoor Unit : CU-4KS31NBU 1unit

2.Rating conditions are: Cooling : Indoor air temp. 80 °F DB / 67 °F WB Outdoor air temp. 95 °F DB / 75 °F WB

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Contents DC Inverter MULTI-SYSTEM AIR Conditioner Safety Precautions Prohibit Table of Contents Appendix a Wall Mounted Type Semi-Concealed TypeOperating Range Unit Specifications Outdoor Unit CU-3KS19NBUIndoor Unit CS-MKS9NKU × Duct Less Type RatedOutdoor Unit Indoor Unit208V 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 UnitOutdoor Unit CU-4KS24NBU Outdoor Unit CU-4KS31NBU Other Component Specifications CU-3KS19NBU CU-4KS24NBU CU-4KS31NBUDimensional Data Unit inchmm 852-0-0010-20500-0 Unit inchmm 852-0-0010-20600-0 Refrigerant Flow Diagram Insulation of Refrigerant TubingIndoor unit Outdoor unitIndoor unit Outdoor unit 1/4 Strainer Header Sub Main Compressor Accumulator Temperature Charts CU-3KS19NBU Temperature ChartsOutdoor Unit CU-3KS19NBU Indoor Unit CS-MKS7NKU × 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 OutdoorPower 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 8FA2-5251-11800-1Outdoor Unit CU-4KS24NBU 8FA2-5251-11600-1 Outdoor Unit CU-4KS31NBU 8FA2-5251-11400-1 Functions Explanation of FunctionsCool Fluctuation fan DRYLow Ambient Cooling Operation Protective Functions Current ControlDescription of function Automatic frequency controlLow Start Current Compressor Temperature ControlCurrent control Troubleshooting Before Calling for Service Precautions before Performing Inspection or RepairLocation of the Error Monitor Lamps Trouble Diagnosis by Error Monitor LampsDisplay of the Error Monitor Lamps Checking the Outdoor System Work procedure Check items unit operationChecking the outdoor unit Problems of Each Part and Inspection Points Trouble Diagnosis of Each PartInspection Points for Each Part Outdoor control circuit boardFuse CompressorElectric expansion valve CU-3KS19NBU MV0 MV1 MV2 CU-4KS24NBU MV3 CU-4KS31NBUBreaker Branch tubing temperature sensorRefrigerant gas pressure Diagnostic procedure Diagnostic resultsRemedy for symptom 3 to Trouble Diagnosis of Fan MotorCharacteristics of New Refrigerant R410A What is New Refrigerant R410A?Characteristics Components mixing proportionsChecklist before Servicing Tubing Installation Procedures Tools Specifically for R410AProcedure for Replacing Compressor Case of Compressor MalfunctionAmount in the charging cylinder is less than 20% ExampleTo prevent the composition R410A from changingWelding leaking points Case Refrigerant is LeakingRecharging When Tubes are Extended Charging Additional RefrigerantRetro-Fitting Existing Systems Use of Existing Units852-6-4190-581-00-1 Contents For Outdoor UnitPlease Read Before Starting Fins of the outdoor unit. You may get injured ‡ 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJGeneral For wall-mounted units Installation Site SelectionFor ceiling-mounted cassette units H1, H2, H3, H4 Connecting indoor unit for CU-3KS19NBU Connecting Indoor UnitsConnecting indoor unit for CU-4KS24NBU 815.88mm Locally purchased Connecting indoor unit for CU-4KS31NBU CS-MKS24NKU Baffle Plate for the Outdoor Unit It is recommended to use baffle platesFront BackAir Intake Baffle Air Discharge BafflePrecautions for installation Outer Dimensions of Outdoor Unit CU-3KS19NBUCU-4KS24NBU CU-4KS31NBUDiagram of Outdoor Unit Installation Never install only a single indoor unitFlaring Procedure with a Flare Tool Installation ProcessUse of the Flaring Method To 0.5 mm Adjust so that the amount of tube Tubing ConnectionsInsulation of Refrigerant Tubing To prevent heat loss and wet floors due to dripping of con For wall-mounted units  For ceiling-mounted cassette unitsAir 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 correctlyWhat is pump-down? Pump-down procedure Pump Down If pump-down is not possibleGeneral Precautions on Wiring Wiring InstructionsRecommended Wire Length and Diameter 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 UnitWiring Instructions for the Outdoor Unit Indoor unit DIndoor unit B Indoor unit CTest Run Checking tubing and wiringPerforming a test run Connecting a Home Automation Device Installation Check SheetDC1111-0