Panasonic CU-4KE24NBU, CU-4KE31NBU, CU-3KE19NBU service manual Cool

Page 73

 

Outdoor heat

 

exchanger temperature (°F)

 

(- 4)

0

Outdoor air

temperature (°F)

 

 

 

 

(21.2)

 

 

(19.4)

L2

 

(-11.2)

L1

 

(-13.0)

Temperature of releasing

Defrost operation time

Less than 2 minutes

2 minutes or more

 

 

 

Heat exchanger

 

 

temperature for

No releasing

57.2 °F or higher (*1)

releasing defrosting

 

 

 

 

 

*1 The temperature for releasing of defrosting is (68 °F) or higher when the outdoor air temperature is less than 32 °F.

 

Fig. 1

 

 

 

Table 1

 

 

 

 

 

 

 

 

 

Control/conditions

 

Unit operation

 

Explanation

 

 

 

 

 

 

 

 

COOL

The ON/OFF operation

The operation lamp illuminates.

The outdoor unit does not operate for 3 minutes

 

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

The indoor temperature and the desired

Operating frequency is stabilized in order to

 

has reached the

temperature are approximately equal.

maintain a comfortable environment.

 

desired temperature.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The thermostat turns

 

 

 

The outdoor unit stops. (It does not stop if the

 

OFF.

 

 

 

thermostart for another indoor unit is ON.)

 

 

 

 

 

 

 

 

 

The thermostat turns

After the thermostat turns ON again, the

After 3 minutes, the outdoor unit begins operating

 

ON again.

outdoor unit will not operate for 3 minutes,

automatically.

 

 

even if the room temperature increases

During these 3 minutes, a pressure balance is

 

 

above the desired temperature.

 

 

achieved, allowing the compressor to start

 

 

 

 

 

 

 

 

 

 

more easily.

 

 

 

 

 

 

 

 

 

Freeze prevention

When the temperature of the indoor heat

In order to protect against freezing, the

 

 

exchanger drops to approximately 35.6 °F

compressor stops temporarily, until the

 

 

or below, the compressor turns OFF, the

temperature of the indoor heat exchanger has

 

 

outdoor fan turns OFF, and the indoor fan

risen.

 

 

continues operating with no changes.

 

 

 

 

 

Approximately 3 minutes later, if the

 

 

 

 

 

temperature of the indoor heat exchanger

 

 

 

 

 

is adove 46.4 °F, the system returns to its

 

 

 

 

 

original conditions.

 

 

 

 

 

 

 

 

 

 

 

 

Stop

All indicator lamps turn OFF. The indoor and

 

 

 

 

 

outdoor units stop.

 

 

 

 

 

 

 

 

 

 

 

 

Operation is restarted

Starts operating in the same operating mode

Within 4 hours after operation was stopped, it is

 

within 4 hours (only when

(COOL) and with the same temperature

assumed that there has been no significant

 

AUTO mode is selected

settings as before operation was stopped.

change in the indoor and outdoor temperatures,

 

with the remote

 

 

 

and the previous conditions (COOL) are stored.

 

controller).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operation starts after 4

New operating mode is determined based on

 

 

 

 

hours or more have

the temperature conditions at the time the

 

 

 

 

 

 

 

 

passed.

ON/OFF operation button is pressed.

 

 

 

 

 

 

 

 

 

 

 

73

Image 73
Contents DC Inverter MULTI-SYSTEM AIR Conditioner Safety Precautions Prohibit Table of Contents Appendix a Semi-Concealed Type Wall Mounted TypeOperating Range Outdoor Unit CU-3KE19NBU Unit SpecificationsIndoor Unit CS-MKE9NKU × Duct Less Type Rated 230VIndoor Unit Outdoor 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 Outdoor Unit Major Component SpecificationsOutdoor Unit CU-4KE24NBU Outdoor Unit CU-4KE31NBU CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU Other Component SpecificationsDimensional Data Unit inchmm 852-0-0010-20400-0 Unit inchmm 852-0-0010-20300-0 Insulation of Refrigerant Tubing Refrigerant Flow DiagramIndoor unit Outdoor unit Valve Narrow tube Curve because it can cause the tube to break or crack Temperature Charts CU-3KE19NBU Temperature ChartsIndoor Unit CS-MKE7NKU × F21 Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NKU × Heating CharacteristicsIndoor 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 Indoor Outdoor Cooling CapacityCS-MKE12NB4U × Power Supply 230V Single Phase 60Hz Cooling CapacityCS-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 TH Total Heating Capacity BTU/h Heating CapacityPower Supply 230V Single Phase 60Hz Heating Capacity 29,200 BTU/h 28,400 BTU/h 32,000 BTU/h 000 CFM Outdoor Unit CU-3KE19NBU 8FA2-5251-11700-1 Electric Wiring DiagramsOutdoor Unit CU-4KE24NBU 8FA2-5251-11500-1 Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1 Explanation of Functions FunctionsStop Cool Frequency control Fluctuation fanFluctuation fan Low Ambient Cooling Operation Protective Functions Clean defrostDefrost Detection and Release Non-stop defrostingDescription of function Current ControlAutomatic frequency control Current controlReset conditions Compressor Temperature ControlLow Start Current Control at Heat Start-upPrecautions before Performing Inspection or Repair Troubleshooting Before Calling for ServiceLocation 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 Checking the defrost operationTrouble Diagnosis of Each Part Problems of Each Part and Inspection PointsInspection Points for Each Part CU-3KE19NBU MV0 MV1 MV2 CU-4KE24NBU CU-4KE31NBU Electric expansion valveBreaker Branch tubing temperature sensorRefrigerant gas pressure Diagnostic results Diagnostic procedureRemedy for symptom 3 to Trouble Diagnosis of Fan MotorWhat is New Refrigerant R410A? Characteristics of New Refrigerant R410ACharacteristics Components mixing proportionsChecklist before Servicing Tools Specifically for R410A Tubing Installation ProceduresCase of Compressor Malfunction Procedure for Replacing CompressorExample Amount in the charging cylinder is less than 20%To prevent the composition R410A from changingWelding leaking points Case Refrigerant is LeakingRecharging Charging Additional Refrigerant When Tubes are ExtendedRetro-Fitting Existing Systems Use of Existing UnitsPage 852-6-4190-584-00-2 For Outdoor Unit ContentsPlease Read Before Starting ‡ 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJ Fins of the outdoor unit. You may get injuredGeneral Indoor Unit Installation Site SelectionFor wall-mounted units For ceiling-mounted cassette unitsH1, H2, H3, H4 Connecting indoor unit for CU-3KE19NBU Connecting Indoor UnitsConnecting indoor unit for CU-4KE24NBU 815.88mm Locally purchased Connecting indoor unit for CU-4KE31NBU CS-MKE24NKU It is recommended to use baffle plates Baffle Plate for the Outdoor UnitFront BackAir Discharge Baffle Air Intake BafflePrecautions for installation CU-3KE19NBU Outer Dimensions of Outdoor UnitCU-4KE24NBU CU-4KE31NBUNever install only a single indoor unit Diagram of Outdoor Unit InstallationFlaring Procedure with a Flare Tool Installation ProcessUse of the Flaring Method Tubing Connections To 0.5 mm Adjust so that the amount of tubeTo prevent heat loss and wet floors due to dripping of con Insulation of Refrigerant Tubing For wall-mounted units  For ceiling-mounted cassette unitsAir Purging Finishing the Installation Air Purging with a Vacuum Pump for Test Run Adapter manual, and use the adapter correctly External diameter of service port R410A 5/16Pump-down procedure What is pump-down? 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 For Outdoor Unit  For solid core wiring or F-cable How to connect wiring to the terminal For stranded wiring For Indoor UnitIndoor unit D Wiring Instructions for the Outdoor UnitIndoor unit B Indoor unit CTest Run Checking tubing and wiringPerforming a test run Installation Check Sheet Connecting a Home Automation DeviceDC1111-0
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CU-3KE19NBU, CU-4KE24NBU, CU-4KE31NBU specifications

The Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are high-efficiency air conditioning units that represent Panasonic's commitment to innovative climate control solutions. These models integrate advanced technologies to deliver superior performance, energy savings, and user comfort, making them ideal for both residential and commercial applications.

The CU-4KE24NBU, a part of the ECOi series, is designed for medium-sized spaces. It boasts an impressive cooling capacity, ensuring optimal temperature regulation. Its inverter technology adjusts the compressor speed according to the needs of the environment, resulting in reduced energy consumption and consistent comfort levels. The unit operates quietly, making it suitable for bedrooms, offices, or other noise-sensitive environments. Additionally, it features a robust air filtration system that improves indoor air quality by removing dust and allergens.

The CU-4KE31NBU offers a slightly higher capacity, making it perfect for larger areas. Like its counterpart, it utilizes inverter technology, which not only enhances energy efficiency but also minimizes wear and tear on the components, leading to a longer lifespan. Its multi-split capability allows for the connection of multiple indoor units to a single outdoor unit, providing flexibility in installation. The CU-4KE31NBU also integrates smart technology that allows users to control the system remotely via smartphones, giving them greater convenience and control over their environment.

For applications requiring a more compact option, the CU-3KE19NBU is an excellent choice. This model balances size and power, offering a competitive cooling capacity that can easily service small to medium-sized rooms. The unit is designed for easy installation and maintenance, featuring a lightweight construction that simplifies handling by technicians. The efficient inverter technology ensures that users benefit from lower energy bills while maintaining a consistent indoor climate.

All three models are equipped with Panasonic’s advanced refrigerants, which contribute to their eco-friendly performance. These refrigerants help reduce greenhouse gas emissions while maintaining high efficiency. Moreover, the units come with built-in diagnostic capabilities, allowing for quick detection of any issues, thus ensuring that the systems operate at peak efficiency throughout their lifespan.

In summary, the Panasonic CU-4KE24NBU, CU-4KE31NBU, and CU-3KE19NBU are exemplary air conditioning solutions that combine cutting-edge technology with user-friendly features, ensuring that they meet the varying needs of today's consumers while promoting energy efficiency and sustainability.