Panasonic CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU service manual Fluctuation fan, Frequency control

Page 74

Frequency control

 

 

(Hz)

 

(senconds)

 

 

 

 

 

 

 

 

 

 

Outdoor air temperature is below 32 °F.

Outdoor air temperature is 32 °F or higher.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(25) Hz

 

(120) seconds

(60) seconds

 

 

 

 

 

 

 

 

 

 

(35) Hz

 

(60) seconds

(30) seconds

 

 

 

 

 

 

 

 

 

 

(45) Hz

 

(60) seconds

(30) seconds

 

 

 

 

 

 

 

 

 

 

(55) Hz

 

(180) seconds

(90) seconds

 

 

 

 

 

 

 

 

 

 

 

 

Table 2

 

 

(1/f fluctuation fan)

 

 

 

 

 

 

 

 

 

 

 

 

Control/conditions

 

Unit operation

Explanation

 

 

 

 

 

 

 

SENSOR

The ON/OFF operation

The operation lamp illuminates.

The outdoor unit does not operate for 3 minutes

DRY

button on the remote

The indoor fan operates at the set fan speed.

even after the breaker is turned ON.

 

controller is pressed.

The outdoor unit stops.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The outdoor unit starts.

The frequency is increased at the rate of 0.5

 

 

 

 

 

Hz every 1 seconds.

 

 

 

(Compressor and the outdoor fan start.)

 

 

 

 

 

 

 

 

 

 

 

 

When the frequency reaches Hz,

This is in order to stabilize the return of oil to the

 

 

 

frequency increases are stopped for a period

compressor.

 

 

 

of seconds. (Refer to Table 2.)

 

 

 

 

 

 

 

 

 

 

 

 

The frequency then increases.

If the indoor and outdoor temperatures are high,

 

 

 

 

 

the current peak cut-off activates, stopping

 

 

 

 

 

any increases in frequency.

 

 

 

 

 

 

 

 

The room temperature

DRY operation starts

Operating frequency is stabilized in order to

 

reaches the desired

 

 

maintain a comfortable environment.

 

temperature, and there

DRY A operation

 

 

 

is no need for further

 

 

 

 

 

 

 

 

cooling.

The indoor fan changes between "Low"

Operates to effectively dehumidify the air while

 

 

 

 

 

 

and "LL" (very low) over a 6-minute cycle.

not excessively reducing the indoor

 

 

 

This is 1/f fluctuation fan operation.

temperature.

 

 

 

(Refer to Fig. 2.)

The indoor unit operates at 1/f fluctuation fan

 

 

 

 

 

 

 

 

 

 

operation, at a fan speed that does not cause

 

 

 

 

 

a chilly feeling.

 

 

 

 

 

 

 

 

The room temperature is

DRY B operation

 

 

 

59 °F or higher, and is

 

 

 

 

 

slightly too cold.

(1) The indoor fan changes between "Low"

The compressor operates on a 3-minutes ON,

 

 

 

and "LL" (very low) over a 6-minute cycle.

6-minutes OFF cycle, to prevent the room

 

 

 

This is 1/f fluctuation fan operation.

temperature from dropping too much.

(2)

After appoximately 3 minutes, the

 

 

compressor turns OFF, the outdoor fan

 

 

turns OFF, and the indoor fan turns OFF.

 

(3)

After approximately 6 minutes, the

 

 

conditions return to (1).

 

 

 

 

The room temperature is

Monitoring operation begins.

When monitoring operation begins, the

below 59 °F.

 

compressor stops, and the indoor fan operates at

 

 

"LL" (very low) speed.

74

Image 74
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-MKE9NKU × Unit SpecificationsOutdoor Unit CU-3KE19NBU Duct Less Type Rated 230VOutdoor Unit Indoor Unit208V 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 UnitOutdoor Unit CU-4KE24NBU Outdoor Unit CU-4KE31NBU Other Component Specifications CU-3KE19NBU CU-4KE24NBU CU-4KE31NBUDimensional Data Unit inchmm 852-0-0010-20400-0 Unit inchmm 852-0-0010-20300-0 Indoor unit Outdoor unit Refrigerant Flow DiagramInsulation of Refrigerant Tubing Valve Narrow tube Curve because it can cause the tube to break or crack Indoor Unit CS-MKE7NKU × Temperature ChartsTemperature Charts CU-3KE19NBU 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 OutdoorPower 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/hPower 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 8FA2-5251-11700-1Outdoor Unit CU-4KE24NBU 8FA2-5251-11500-1 Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1 Functions Explanation of FunctionsStop Cool Fluctuation fan Frequency controlFluctuation fan Low Ambient Cooling Operation Defrost Detection and Release Clean defrostProtective Functions Non-stop defrostingAutomatic frequency control Current ControlDescription of function Current controlLow Start Current Compressor Temperature ControlReset conditions Control at Heat Start-upTroubleshooting Before Calling for Service Precautions before Performing Inspection or RepairDisplay of the Error Monitor Lamps Trouble Diagnosis by Error Monitor LampsLocation of the Error Monitor Lamps Checking the outdoor unit Work procedure Check items unit operationChecking the Outdoor System Checking the defrost operationProblems of Each Part and Inspection Points Trouble Diagnosis of Each PartInspection Points for Each Part Electric expansion valve CU-3KE19NBU MV0 MV1 MV2 CU-4KE24NBU CU-4KE31NBURefrigerant gas pressure Branch tubing temperature sensorBreaker 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 changingRecharging Case Refrigerant is LeakingWelding leaking points Retro-Fitting Existing Systems When Tubes are ExtendedCharging Additional Refrigerant Use of Existing UnitsPage 852-6-4190-584-00-2 Contents For Outdoor UnitPlease Read Before Starting Fins of the outdoor unit. You may get injured ‡ 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJGeneral For wall-mounted units Installation Site SelectionIndoor Unit For ceiling-mounted cassette unitsH1, H2, H3, H4 Connecting indoor unit for CU-4KE24NBU Connecting Indoor UnitsConnecting indoor unit for CU-3KE19NBU 815.88mm Locally purchased Connecting indoor unit for CU-4KE31NBU CS-MKE24NKU Front Baffle Plate for the Outdoor UnitIt is recommended to use baffle plates BackAir Intake Baffle Air Discharge BafflePrecautions for installation CU-4KE24NBU Outer Dimensions of Outdoor UnitCU-3KE19NBU CU-4KE31NBUDiagram of Outdoor Unit Installation Never install only a single indoor unitUse of the Flaring Method Installation ProcessFlaring Procedure with a Flare Tool 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 units Air Purging with a Vacuum Pump for Test Run Finishing the InstallationAir Purging 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 possibleRecommended Wire Length and Diameter Wiring InstructionsGeneral Precautions on Wiring 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 CPerforming a test run Checking tubing and wiringTest Run Connecting a Home Automation Device Installation Check SheetDC1111-0
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CU-3KE19NBU, CU-4KE24NBU, CU-4KE31NBU specifications

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