Panasonic CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU service manual Explanation of Functions

Page 71

7. FUNCTIONS

7-1. Explanation of Functions

NOTE The numerical values such as temperature, frequency, time and current in parentheses are an example

of CU-4KE31NBU and the values are different from the other models.

 

Control/conditions

 

Unit operation

Explanation

 

 

 

 

 

 

INITIAL Breaker is ON.

 

 

 

Power is supplied to the indoor and outdoor unit

 

 

 

 

 

control circuits, however the unit remains stopped.

 

 

 

 

 

Positioning of the outdoor unit electric expansion

 

 

 

 

 

valve is performed.

 

 

 

 

 

 

 

The ON/OFF operation

If automatic operation mode has been selected

This applies in the case of automatic

 

button on the remote

with the remote controller, operation begins in

HEAT/COOL operation.

 

controller is pressed.

HEAT, SENSOR DRY, or COOL mode

 

 

 

depending on the room temperature and

 

 

 

outdoor temperature at the time operation starts.

 

 

 

 

 

 

 

 

 

 

 

Depending on the operational mode, refer to the HEAT, SENSOR DRY, or COOL item.

 

 

 

 

 

 

HEAT

The ON/OFF operation

 

 

Operation lamp illuminates.

The unit is forced to stop for 3 minutes after

 

button on the remote

 

 

Indoor fan is stopped to prevent cold air from

the power is turned ON, or 3 minutes after the

 

controller is pressed.

 

 

compressor stops, in order to protect the

 

 

 

being emitted.

 

 

 

 

compressor.

 

 

 

 

Outdoor unit begins operating after

 

 

 

 

The frequency is increased at the rate of 1 Hz

 

 

 

 

forced-stop is canceled.

 

 

 

 

every 0.5 seconds.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When the indoor coil temperature rises,

Depending on the relationship between the

 

 

 

 

the compressor starts,

remote controller temperature setting and the

 

 

 

 

room temperature, the compressor may stop

 

 

 

 

the outdoor fan starts,

 

 

 

 

temporarily (in other words, the thermostat

 

 

 

 

and the indoor fan changes from "LL"

 

 

 

 

may turn OFF).

 

 

 

 

 

 

 

 

to the set fan speed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When the frequency reaches Hz,frequency

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

 

 

 

increases are stopped for a period of seconds.

compressor.

 

 

 

(Refor to Table 2 "Freguency control".)

 

 

 

 

 

 

 

 

 

 

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 remote

Operating frequency is stabilized in order to

 

has reached the desired

 

 

controller temperature setting are

maintain a comfortable environment.

 

temperature.

 

 

approximately equal.

 

 

 

 

 

 

 

 

The thermostat turns

 

 

The indoor fan is stopped.

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

 

OFF.

 

 

 

thermostat for another indoor unit is ON.)

 

 

 

 

 

Approximately 30 seconds after the

 

 

 

 

 

thermostat turns OFF, the indoor fan is

 

 

 

 

 

stopped.

 

 

 

 

 

 

 

The indoor and outdoor

 

In order to protect the compressor, the outdoor

The outdoor unit starts automatically after 3

 

temperatures are high.

 

unit will not operate for 3 minutes after the

minutes.

 

 

 

thermostat turns OFF, even if the room

During these 3 minutes, a low-pressure

 

 

 

temperature drops below the desired

 

 

 

pressure balance is achieved, allowing the

 

 

 

temperature.

 

 

 

compressor to start more easily.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The frequency is not increased, even if

The amount of heat pump exceeds the amount

 

 

 

 

there is a difference between the room

of heat radiation from the room.

 

 

 

 

temperature and the desired temperature.

Therefore, there is no need to further increase

 

 

 

 

In some cases, the frequency may be

the compressor capacity, and the frequency is

 

 

 

 

decreased.

stabilized or lowered.

 

 

 

 

 

 

71

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Contents DC Inverter MULTI-SYSTEM AIR Conditioner Safety Precautions Prohibit Table of Contents Appendix a Semi-Concealed Type Wall Mounted TypeOperating Range Duct Less Type Rated 230V Unit SpecificationsOutdoor Unit CU-3KE19NBU Indoor Unit CS-MKE9NKU ×Indoor 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 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 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 Non-stop defrosting Clean defrostProtective Functions Defrost Detection and ReleaseCurrent control Current ControlDescription of function Automatic frequency controlControl at Heat Start-up Compressor Temperature ControlReset conditions Low Start CurrentPrecautions before Performing Inspection or Repair Troubleshooting Before Calling for ServiceDisplay of the Error Monitor Lamps Trouble Diagnosis by Error Monitor LampsLocation of the Error Monitor Lamps Checking the defrost operation Work procedure Check items unit operationChecking the Outdoor System Checking the outdoor unitTrouble 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 valveRefrigerant gas pressure Branch tubing temperature sensorBreaker Trouble Diagnosis of Fan Motor Diagnostic procedureDiagnostic results Remedy for symptom 3 toComponents mixing proportions Characteristics of New Refrigerant R410AWhat is New Refrigerant R410A? CharacteristicsChecklist before Servicing Tools Specifically for R410A Tubing Installation ProceduresCase of Compressor Malfunction Procedure for Replacing CompressorR410A from changing Amount in the charging cylinder is less than 20%Example To prevent the compositionRecharging Case Refrigerant is LeakingWelding leaking points Use of Existing Units When Tubes are ExtendedCharging Additional Refrigerant Retro-Fitting Existing SystemsPage 852-6-4190-584-00-2 For Outdoor Unit ContentsPlease Read Before Starting ‡ 8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJ Fins of the outdoor unit. You may get injuredGeneral For ceiling-mounted cassette units Installation Site SelectionIndoor Unit For wall-mounted 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 Back Baffle Plate for the Outdoor UnitIt is recommended to use baffle plates FrontAir Discharge Baffle Air Intake BafflePrecautions for installation CU-4KE31NBU Outer Dimensions of Outdoor UnitCU-3KE19NBU CU-4KE24NBUNever install only a single indoor unit Diagram of Outdoor Unit InstallationUse of the Flaring Method Installation ProcessFlaring Procedure with a Flare Tool Tubing Connections To 0.5 mm Adjust so that the amount of tube For ceiling-mounted cassette units Insulation of Refrigerant TubingTo prevent heat loss and wet floors due to dripping of con  For wall-mounted units Air Purging with a Vacuum Pump for Test Run Finishing the InstallationAir Purging Adapter manual, and use the adapter correctly External diameter of service port R410A 5/16If pump-down is not possible What is pump-down?Pump-down procedure  Pump DownRecommended Wire Length and Diameter Wiring InstructionsGeneral Precautions on Wiring Disconnect switch may be required by national or local codes For Indoor Unit How to connect wiring to the terminalFor Outdoor Unit  For solid core wiring or F-cable  For stranded wiringIndoor unit C Wiring Instructions for the Outdoor UnitIndoor unit D Indoor unit BPerforming a test run Checking tubing and wiringTest 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.