Panasonic CU-4KS31NBU service manual Adapter manual, and use the adapter correctly

Page 106

Perform the air purge for tubes A, B, C, and D. Use the same procedures for all tubes.

(1)Check that each tube (both narrow and wide tubes) between the indoor and outdoor units have been proper- ly connected and all wiring for the test run has been completed. Note that both narrow and wide tube service valves on the outdoor unit are kept closed at this stage.

(2)Using an adjustable wrench or box wrench, remove the valve caps from the service valve on both narrow and wide tubes.

(3)Connect a vacuum pump and a manifold valve (with pressure gauges) to the service port on the wide tube service valve. (Fig. 20).

Before using the vacuum pump CAUTION adapter, read the vacuum pump

adapter manual, and use the adapter correctly.

Stopper

Cap tightening torque:

 

Spindle

170 – 215 lbs·in

Service port

(200 – 250 kgf·cm)

(Tighten by hand, then

Screw diameter: 1/2

use a wrench to turn

UNF 20 threads

approximately

 

Valve core

45°.)

 

Cap nut tightening torque:

 

60 – 95 lbs·in

 

(70 – 110 kgf·cm)

 

(Tighten by hand, then use a

 

wrench to turn approximately 30 .)

 

<Structure of service valve on wide tube side>

NOTE

External diameter of service port

R410A: 5/16"

Fig. 21

CAUTION

Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose. The “Hi” knob of the manifold valve must always be kept closed.

When using a hex wrench to open the spindle, an extremely small amount of refrigerant may leak. This does not indicate a problem.

Use a hex wrench of a type to which force can be easily applied.

(4)With the “Lo” knob of the manifold valve open and high-pressure valve (“Hi”) closed completely, run the vacuum pump. Run the pump until the pressure is –101 kPa (–76 cmHg). The operation time for the vacuum pump varies with tubing length and the capacity of the pump. The following table shows the amount of time required for evacuation:

Table 5

Required time for evacuation when capacity

of 100 liter/h vacuum pump is used

20 min. or more

NOTE

The required time in Table 5 is calculated based on the assumption that the ideal (or target) vacuum condition is around 10 mmHg abs.

(5)With the vacuum pump still running, close the “Lo” knob of the manifold valve. Then stop the vacuum pump. Fully close the low-pressure valve and stop the vacuum pump. (Wait 1 – 2 minutes and check that the manifold gauge pointer does not return. If it does return, find and repair the leak, then apply the vacuum again.)

(6)With a hex wrench, turn the valve stem on the narrow tube service valve counter-clockwise by 90 degrees (1/4 turn) for 10 seconds, and then turn the stem clockwise to close it again.

CAUTION

Be sure to completely insert the hex wrench before attempting to turn the valve.

(7)With a standard screwdriver, turn the wide tube service valve stem counterclockwise to fully open the valve.

(8)Turn the narrow tube service valve stem counter-clockwise to fully open the valve.

(9)Loosen the vacuum hose connected to the wide tube service port slightly to release the pressure. Then, remove the hose.

(10)Leak test all joints at the tubing (both indoor and outdoors) with liquid soap. Bubbles indicate a leak. Be sure to wipe off the soap with a clean cloth.

CAUTION

If a CFC gas detector is used, use a special detector for HFC refrigerant (such as R410A and R134a).

20

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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 Indoor Unit CS-MKS9NKU × Unit SpecificationsOutdoor Unit CU-3KS19NBU 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 Indoor unit Refrigerant Flow DiagramInsulation of Refrigerant Tubing 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 Description of function Protective FunctionsCurrent Control 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 PartFuse Inspection Points for Each PartOutdoor control circuit board CompressorElectric expansion valve CU-3KS19NBU MV0 MV1 MV2 CU-4KS24NBU MV3 CU-4KS31NBUBreaker Branch tubing temperature sensorRefrigerant gas pressure Remedy for symptom 3 to Diagnostic procedureDiagnostic results Trouble Diagnosis of Fan MotorCharacteristics Characteristics of New Refrigerant R410AWhat is New Refrigerant R410A? Components mixing proportionsChecklist before Servicing Tubing Installation Procedures Tools Specifically for R410AProcedure for Replacing Compressor Case of Compressor MalfunctionTo prevent the composition Amount in the charging cylinder is less than 20%Example R410A from changingWelding leaking points Case Refrigerant is LeakingRecharging Retro-Fitting Existing Systems When Tubes are ExtendedCharging Additional Refrigerant 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 Front Baffle Plate for the Outdoor UnitIt is recommended to use baffle plates BackAir Intake Baffle Air Discharge BafflePrecautions for installation CU-4KS24NBU Outer Dimensions of Outdoor UnitCU-3KS19NBU 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 Connections For wall-mounted units Insulation of Refrigerant TubingTo prevent heat loss and wet floors due to dripping of con  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 correctly Pump Down What is pump-down?Pump-down procedure 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  For stranded wiring How to connect wiring to the terminalFor Outdoor Unit  For solid core wiring or F-cable For Indoor UnitIndoor unit B Wiring Instructions for the Outdoor UnitIndoor unit D Indoor unit CTest Run Checking tubing and wiringPerforming a test run Connecting a Home Automation Device Installation Check SheetDC1111-0