Panasonic CS-F24DB4E5, CS-F28DB4E5 Service Manual

Order No. MAC0409030C2

Air Conditioner

CS-F24DB4E5 CU-L24DBE5 CS-F28DB4E5 CU-L28DBE5

CONTENTS

Page Page

1 Service Information 3

1.1. Example of trouble at test operation

1.2. Caution of test operation

1.3. Caution during automatic address setting

1.4. Operation range

2 Features

2.1. Variety of excellent features

2.2. Low-noise outdoor units

2.3. Improved workability

2.4. A brand-new control method 9

2.5. Wired Remote Control

2.6. Wireless Remote Control

2.7. Group Control Equipment

3 Specification

3.1. Product Specification

4 Dimensions

4.1. CS-F24DB4E5 CS-F28DB4E5

4.2. CU-L24DBE5 CU-L28DBE5

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

5 Refrigeration Cycle 16

6 Block Diagram

6.1. CS-F24DB4E5 CS-F28DB4E5

6.2. CU-L24DBE5 CU-L28DBE5

7 Wiring Diagram

7.1. CS-F24DB4E5 CS-F28DB4E5

7.2. CU-L24DBE5 CU-L28DBE5

8 Operation Details

8.1. Wired Remote Control (Optional part)

8.2. Wireless Remote Control (Optional part)

9 Operation Control

9.1. Operation Mode

9.2. Compressor Start Control

9.3. Cooling Operation

9.4. Heating Mode Operation

9.5. Louver Control

9.6. Odour Removing Operation

9.7. Energy Save Operation

9.8. Outdoor Fan Remaining Heat Removal Control

9.9. Crank Case Heater Control

9.10. Valve Error

9.11. Pump Down Operation

9.12. Indoor Air Volume Up Control (DC Fan Motor Type Only)

10 Installation Instruction

10.1. Pipe length

10.2. Refrigerant additional charge

10.3. Position of the centre gravity

10.4. Indoor unit installation

10.5. Outdoor unit installation

10.6. Wired remote control installation

10.7. Wireless remote control installation manual

10.8. Twin and triple

11 Installation and Servicing Air Conditioner Using R410A

11.1. Outline

11.2. Tools for installing/servicing refrigerant piping

11.3. Refrigerant piping work

11.4. Installation, transferring, servicing

12 Troubleshooting Guide

12.1. Self-diagnosis error code table

13 Replacement Parts

13.1. Indoor unit

13.2. Outdoor unit

14 Electronic Circuit Diagram

14.1. Indoor unit

14.2. Outdoor unit

14.3. Wired remote control

14.4. Wireless remote control

14.5. Print pattern

100

107

108

109

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

1 Service Information

Notice of Address setting for NEW Cassette / NEW Outdoor Unit.

The new Cassette / New Outdoor models are possible to have address setting for twin / triple control or group control by automatic when main power supply is switched on.

(Manual address setting is also possible by using Dip switch on Indoor unit P.C. board.) However,

possible when made proper wiring connection and also Indoor unit should be original virgin unit

1.1. Example of trouble at test operation

If found out as following phenomenon at test operation on site, it may have possibility of wrong address setting. Therefore, please ensure of the address setting.

1. LCD display of wired remote control had not illuminate although the main power supply switch is ‘on’.

2. LCD display had indicate d as normal illumination when power supply switch is ‘on’, however outdoor unit cannot be operated. (But, it is necessary to take 3 to 5 minutes for outdoor unit to start from the timing of remote control ON/OFF switch is ‘on’.)

3. P.C. board had memorized wrong setting information.

a. If main power supply is switched ‘on’ with the wrong connection.

b. When changing the connection or combination of units due to re-installation etc.

•

When changing the system from twin to triple (triple to twin).

• •

•

When changing the system from group control to normal one to one system.

• •

•

When making the replacement of units as master and slave etc.

• •

this address setting is only

1.2. Caution of test operation

Do not touch the remote control switch and do not change any wirings for one minute when the main power supply switch is ‘on’. (Because the unit is having automatic address setting during the first one minute.)

1.3. Caution during automatic address setting

When main power supply switch is ‘on’, the P.C. board will automatically memorized the connecting system. Consequently, when initial power supply is ‘on’, there will not be interchangeability of units even of the same type and same capacity unit. Therefore unable to connect the unit to another system.

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

1.4. Operation range

1.4.1. Power Supply

The applicable voltage range for each unit is given in the following table. The working voltage among the three phases must be balanced within a 3% deviation from each voltage at the compressor terminals. The starting voltage must be higher than 85% of the rated voltage.

MODEL Unit Main Power Applicable Voltage

CU- Phase, Volts Hz Max Min L24DBE5 1~240 50 264 216 L28DBE5 1~220 50 242 198

1~230 50 253 207

1.4.2. Indoor and Outdoor Temperature

•

Model 50Hz CU-L24DBE5, CU-L28DBE5

• •

Operating Hz Indoor Temp. (D.B./W.B.) (°C) Outdoor Temp. (D.B./W.B.) (°C)

Max Min Max Min Cooling 50 32/23 21/15 43/- -15/Heating 50 27/- 16/- 24/18 -20/-

2 Features

2.1. Variety of excellent features

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

2.1.1. Compact design

•

The height is only 246 mm and can be installed even where the space is limited.

• •

2.1.2. Automatic restart function

•

When the electric power comes back after a power failure, the unit itself automatically restarts the operation in the pre-failure

• •

mode.

2.1.3. Auto fan mode (indoor unit)

•

Auto fan mode is added besides Hi, Me and Lo.

• •

It automatically adjusts the fan speed according to the indoor temperature.

2.1.4. Dry mode function

•

Dry mode can make a comfortable indoor environment during wet season.

• •

2.1.5. Quiet operation

•

The sound level is as low as 32 dB (A) for model CS-F24DB4E5, 33 dB (A) for model CS-F28DB4E5 and suitable for offices,

• •

shops, homes etc., where quiet operation is essential.

2.1.6. Auto Swing Louvre

•

The air flow angle can be changed automatically (or manually) to an angle between 10° to 70° using the remote control.

• •

2.1.7. Low ambient cooling operation

•

Cooling operation is possible at outdoor temperature of -5°C.

• •

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

2.1.8. Piping and drainage

•

Built-in upward draining mechanism.

• •

2.1.9. Automatic changeover function (heat pump models)

•

The unit automatically switches between cooling and heating in accordance with operating load in order to maintain a

• •

comfortable indoor temperature.

2.1.10. Hot start system (heat pump models)

2.2. Low-noise outdoor units

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

[Product features]

2.2.1. Low-noise design improves in surrounding areas

1. The noise-suppressing winglet fan is a result of new research into vane design theory. The unique curved shape suppresses the generation of vortexes, thus reduces air flow noise.

2. The adoption of double-orifice rings reduces air passage resistance.

3. Strengthening of the noise insulation materials in the compressor and the sealing-in of mechanical noise allows vibration noise to be greatly enclosed and suppressed.

4. The heat exchanger has an L-shaped design to allow air to flow more smoothly.

5. Noise is automatically reduced further during night time operation with lower outdoor air temperatures.

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

2.3. Improved workability

2.3.1. Pipes that are one size larger can also be connected for renewal

•

If renewing the system, existing refrigerant pipes can be

• •

utilized so that only the indoor units need to be replaced.

•

For example, liquid and gas pipes from 10 years ago can be

• •

connected to current pipes with the same size for one size larger. Effective utilization of materials reduces working time and trouble. (Adaptor sockets are not supplied.)

2.3.2. Additional refrigerant charging

•

All models do not require any additional charging of refrigerant for 30m of pipe length. This makes installation much easier.

• •

2.3.3. Drain water dripping-prevention structure

•

The base of the outdoor unit is provided with a single drain

• •

hole in order to prevent drain water from leaking out of the unit. Body connecting a drain elbow and a discharge pipe, water leakages can be prevented even when the unit is installed against a wall.

2.3.4. Space saving design allows units to be installed side by side continuously

•

Servicing after installation can be carried-out by removing the front covers.

• •

2.3.5. Easy test operation

•

Test operation can be carried out for both indoor and outdoor units.

• •

2.3.6. Long pipe design

•

Maximum piping length of 50m.

• •

2.3.7. Internal pipe connection

•

Pipes are connected inside the units (inside the side covers), making the final appearance more attractive.

• •

•

Pipes can be diverted outward in any of four directions (forward, right, down, rear).

• •

•

Small liquid pipe diameters of 9.53mm, making installation work much easier.

• •

CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5

2.3.8. Centralized draining method

•

Even when multiple outdoor units are installed to a wall, the

• •

drain outlets can be concentrated into a single drain pipe. This makes installation easier and also improve appearance.

2.4. A brand-new control method

Easier power supply wiring connec tion

1. Power supply wiring and other wiring tasks can be carried out more easily.

•

Twin non-polar wires used to connect indoor and outdoor units.

• •

•

Adoption of connection error prevention circuits for drive wires and signal wires. If a connection error is made, the relay does

• •

not operate and current does not flow to the circuit boards.

Twin and Triple operation

•

Simultaneous air conditioning of wide spaces and corners is possible. Indoor units of different horsepowers can even be

• •

used in combination.

•

Master unit and slave-units can be set automatically in twin and triple systems. No address setting is necessary.

• •

•

Multiple indoor units can be operated simultaneously with a single remote control. Note that individual operation is not

• •

possible.

Separate indoor/outdoor unit power supplies

The power supply can be connected to (1) just the outdoor units, or (2) to both the indoor and outdoor units.

Easy test operation

Test operation can be carried out for both indoor and outdoor units.

Automatic setting initialization function

In accordance with the indoor and outdoor units connected and the connection methods, conditions such as the connection configuration (twin or triple format) and remote-control functions such as automatic louvre operation and cooling or heating mode are automatically detected and set instantly.

(Remote control and Indoor unit)

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

2.5. Wired Remote Control

1. The new design includes an easily-visible red pilot lamp. The power can be turned on and off at a single touch, without opening the cover.

2. Has a build-in thermistor, allowing indoor temperature detection in accordance with indoor conditions by switching with main unit thermistor.

3. Twin non-polar wires make installation work easy. (10 m cable supplied as accessory.)

2.6. Wireless Remote Control

1. New design with compact size. (Operation range within approximately 8 m.)

2. Built-in timer with OFF/ON timer setting (within 24 hours)

Wired Wireless

CZ-RD513C CZ-RL513B

NOTE: Both of the above remote control is packed separately from the indoor unit.

2.7. Group Control Equipment

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

Wired remote control

Common

control

Group control by one remote control

•

All air conditioner units are

• •

controlled as a whole by remote control.

•

All indoor units operate in the

• •

same mode.

•

A maximum of 16 units can be

• •

connected together (sequental starting)

Twin remote control separate control

•

Each indoor unit can be operated

• •

by either one of the two remote control.

•

Apart from timer setting time,

• •

displays for two remote control are identical.

•

Last button pressed has priority

• •

(main or slave is set at remote control unit).

Common control / group

•

Operation is possible using either

• •

wired or wireless remote control unit.

•

Last button pressed has priority.

• •

[Remote side]

•

Optional wired remote

• •

control CZ-RD513C

[Local side]

Not needed

[Remote side]

•

Optional wired remote

• •

control

[Local side]

•

Optional wired remote

• •

control CZ-RD513C

•

Optional wired remote

• •

control and wireless remote control

Wired CZ-RD513C

Wireless CZ-RL513B

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

3 Specification

3.1. Product Specification

3.1.1. CS-F24DB4E5 CU-L24DBE5

ITEM / MODEL Indoor Unit Outdoor Unit

Main Body CS-F24DB4E5 CU-L24DBE5

Panel CZ-BT03P

Remote CZ-RD513C (Wired)

Control CZ-RL513B (Wireless)

Cooling Capacity kW 6.3

BTU/h 21,500

Heating Capacity kW 7.1

BTU/h 24,200 Refrigerant Charge-less m 30 Standard Air Volume for High, m3/min Hi 18 Me 16 Lo 14 Hi 48 Medium and Low Speed cfm 636 562 488 1695 Outside Dimension (H x W x D) mm 246 x 840 x 840 795 x 900 x 320

inch 9-11/16 x 33-1/24 x 33-1/24 31-5/16 x 35-7/16 x 12-19/32 Net Weight kg (lbs) 26 (58) 71 (158) Piping

Connection

Compressor Type, Number of Set - Hermetic - 2P (Rotary), 1

Fan Type, Number of Set Turbo fan-1 Propeller fan-1

Air-heat Exchanger (Row x Stage x FPI) Louver-fin type (2 x 10 x 20) Corrugate-fin type (2 x 36 x 19) Refrigerant Control - Exp. Value Refrigerant Oil (Charged) cm Refrigerant (Charged) R410A kg (oz) - 2.13 (75) Running

Adjustment

Safety Devices Internal protector for compressor, Internal thermostat for fan motor,

Noise Level dB (A) Hi 36 Lo 32 Cooling 47, Heating 49

Moisture Removal L/h (Pt/h) 3.6 (7.6) EER W/W 3.71 COP W/W 3.86

Refrigerant Gas mm (inch) O.D Ø 15.88 (5/8) Flared Type

Liquid mm (inch) O.D Ø 9.53 (3/8) Flared Type

Drain mm O.DØ20 I.DØ20x1

Starting Method - DC-INV control Motor Type - 4-pole single phase brushless motor

Rated Output kW - 1.8

Motor Type 8-pole single phase induction motor 6-pole single phase induction motor

Rated Output kW 0.04 0.07

Control Switch Wireless or Wired Remote Control Room Temperature Thermostat -

Crankcase heater, High pressure switch, Current transformer

Power level dB Cooling : Hi 51 Lo 47

Heating : Hi 51 Lo 47

- FV50S (800)

Cooling 63, Heating 65

1. Cooling capacities are based on indoor temperature of 27°C D.B. (80.6°F D.B.), 19.0°C W.B. (66.2°F W.B.) and outdoor air temperature of 35°C D.B. (95°F D.B.), 24°C W.B. (75.2°F W.B.)

2. Heating capacities are based on indoor temperature 20°C D.B. (68°F D.B.) and outdoor air temperature of 7°C D.B. (44.6°F

D.B.), 6°C W.B. (42.8°F W.B.)

ELECTRICAL DATA (50 Hz)

ITEM / MODEL Condition by JIS-B8615 Volts V 220 230 240 Phase Single Single Single Power Consumption kW Cool 1.70 1.70 1.70

Heat 1.84 1.84 1.84

Running Current A Cool 8.0 7.7 7.5

Heat 8.7 8.4 8.1 Starting Current A 8.7 8.4 8.1 Power Factor % Cool 97 96 94

Heat 96 95 95 *Power Factor means total figure of compressor, indoor fan motor and outdoor fan motor. Panasonic Power source AC, 1~220V, 230V, 240V 50Hz

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

3.1.2. CS-F28DB4E5 CU-L28DBE5

ITEM / MODEL Indoor Unit Outdoor Unit

Main Body CS-F28DB4E5 CU-L28DBE5

Panel CZ-BT03P

Remote CZ-RD513C (Wired)

Control CZ-RL513B (Wireless)

Cooling Capacity kW 7.1

BTU/h 24,200

Heating Capacity kW 8.0

BTU/h 27,300 Refrigerant Charge-less m 30 Standard Air Volume for High, m3/min Hi 20 Me 18 Lo 16 Hi 48 Medium and Low Speed cfm 706 631 556 1695 Outside Dimension (H x W x D) mm 246 x 840 x 840 795 x 900 x 320

inch 9-11/16 x 33-1/24 x 33-1/24 31-5/16 x 35-7/16 x 12-19/32 Net Weight kg (lbs) 26 (58) 71 (158) Piping

Connection

Compressor Type, Number of Set - Hermetic - 2P (Rotary), 1

Fan Type, Number of Set Turbo fan-1 Propeller fan-1

Adjustment

Safety Devices Internal protector for compressor, Internal thermostat for fan motor,

Noise Level dB (A) Hi 38 Lo 33 Cooling 48, Heating 50

Moisture Removal L/h (Pt/h) 4.2 (8.9) EER W/W 3.55 COP W/W 3.79

Refrigerant Gas mm (inch) O.D Ø 15.88 (5/8) Flared Type

Liquid mm (inch) O.D Ø 9.53 (3/8) Flared Type

Drain mm O.DØ20 I.D Ø 20 x 1

Starting Method - DC-INV control Motor Type - 4-pole single phase brushless motor

Rated Output kW - 2.0

Motor Type 8-pole single phase induction motor 6-pole single phase induction motor

Rated Output kW 0.04 0.07

Control Switch Wireless or Wired Remote Control Room Temperature Thermostat -

Crankcase heater, High pressure switch, Current transformer

Power level dB Cooling : Hi 53 Lo 48

Heating : Hi 53 Lo 48

- FV50S (800)

Cooling 64, Heating 66

1. Cooling capacities are based on indoor temperature of 27°C D.B. (80.6°F D.B.), 19.0°C W.B. (66.2°F W.B.) and outdoor air temperature of 35°C D.B. (95°F D.B.), 24°C W.B. (75.2°F W.B.)

2. Heating capacities are based on indoor temperature of 20°C D.B. (68°F D.B.) and outdoor air temperature of 7°C D.B. (44.6°F D.B.), 6°C W.B. (42.8°F W.B.)

ELECTRICAL DATA (50 Hz)

ITEM / MODEL Condition by JIS-B8615 Volts V 220 230 240 Phase Single Single Single Power Consumption kW Cool 2.00 2.44 2.00

Heat 2.11 2.65 2.11

Running Current A Cool 9.5 11.1 8.8

Heat 9.9 9.6 9.2 Starting Current A 9.9 9.6 9.2 Power Factor % Cool 96 96 95

Heat 97 96 96 *Power Factor means total figure of compressor, indoor fan motor and outdoor fan motor. Panasonic Power source AC, 1~220V, 230V, 240V 50Hz

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

4 Dimensions

4.1. CS-F24DB4E5 CS-F28DB4E5

4.2. CU-L24DBE5 CU-L28DBE5

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

5 Refrigeration Cycle

6 Block Diagram

6.1. CS-F24DB4E5 CS-F28DB4E5

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

6.2. CU-L24DBE5 CU-L28DBE5

7 Wiring Diagram

7.1. CS-F24DB4E5 CS-F28DB4E5

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

7.2. CU-L24DBE5 CU-L28DBE5

8 Operation Details

8.1. Wired Remote Control (Optional part)

Name and function of each part

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

OFF/ON button

Used to start and stop the operation.

FAN SPEED button

Used to select the fan speed of high (HI), medium (MED), low (LO) or auto (AUTO).

MODE button

Used to select the operation of AUTO, HEAT, FAN, COOL, or DRY.

TEMP (UP/DOWN) buttons

Used to select the desired temperature.

AIR SWING (AUTO/MANUAL) buttons

Used to determined the air swing condition, either auto or manual.

REMOTE

The OFF/ON button cannot be used.

LOCAL

All wired remote control buttons can be used.

Time/time setting display

Check display

Fan speed display

Operation mode selection display

FILTER RESET display

(Appears after the cumulative running time reaches approximately 2,500 hours of operation.)

Temperature setting display (16°C - 31°C)

Airflow direction setting display

FILTER RESET button

Press to reset the “FILTER RESET” display after washing the filter.

TEST RUN button*

VENTILATION button*

ECONOMY operation button

Provides Energy saving function

ODOUR WASH button

Provides deodorizing function.

CHECK button

Press this button if the check display is flashing.

TIMER/CLOCK SET buttons

Used to set the timer operation and the current time.

Operation indicator

Lights up when the unit in operation.

NOTES

•

Ensure that the correct button is pressed as simultaneous pressing of the multiple buttons will not make the setting correct.

• •

•

The illustration above is for explanatory purposes only. The appearance will be different during actual operation.

• •

•

Do not operate the remote control with wet hands. Otherwise, electric shock or malfunction may occur.

• •

•

Do not press the remote control buttons with sharp object as this may damage the remote control.

• •

•

Buttons marked with * are not needed for normal operation. If one of these buttons is pressed by mistake, press the same

• •

button once more to cancel the operation.

•

When the power resumed after power failure, the unit will restart automatically with all the previous settings preserved by

• •

the memory function. (Auto restart function)

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

8.2. Wireless Remote Control (Optional part)

Name and function of each part

OFF/ON button

Used to start and stop the operation.

ODOUR WASH button

FILTER RESET button

Press to cancel the “FILTER” indicator light on the control panel.

FAN SPEED button

Used to select the fan speed of high (HI), medium (MED), low (LO) or auto (AUTO).

SET button*

Local setting function.

ADDRESS SET button*

Used to change the address setting when using more than one indoor unit.

Transmitter

Transmits the remote control signal.

Airflow direction setting display

Fan speed display

Temperature setting display (16°C - 31°C)

Time/time setting display

Shows the timer operation setting time or the current time.

RESET button

Pressing this button will clear all the settings from memory. You will then need to make the settings again.

TIMER/CLOCK SET buttons

Used to set the timer operation and the current time.

AIR SWING (AUTO/MANUAL) buttons

Used to determine the air swing condition, either auto or manual.

MODE button

Used to select the operation of AUTO, HEAT, FAN, COOL or DRY.

TEMP (UP/DOWN) buttons

Used to select the desired temperature.

ECONOMY operation button

Address number display

Operation selection display

NOTES

•

Ensure that the correct button is pressed as simultaneous pressing of the multiple buttons will not make the setting correct.

• •

•

The illustration above is for explanatory purpose only. The appearance will be different during actual operation.

• •

•

If using the wireless remote control in conjunction with the wired remote control, the settings made from the wireless remote

• •

control will appear on the wired remote control display (except when making timer settings).

•

Buttons marked with * are not needed for normal operation. If one of these buttons is pressed by mistake, press the same

• •

button once more to cancel the operation.

•

When the power resumed after power failure, the unit will restart automatically with all previous settings preserved by the

• •

memory function. (Auto restart function)

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

9 Operation Control

Description of basic control functions

9.1. Operation Mode

1. Thermostat control

2. Depend on differences between room temperature and setting temperature, Compressor running frequency will be decided and start operation.

Temperature differences become same as below table, then thermostat is off.

Temperature Differences

Unit: °C Indoor type Cassette Ceiling Duct D2 Duct D3 Cool mode -1.5 -1.5 -2.0 -2.0 Dry mode -2.5 -2.5 -3.0 -3.0 Heat mode 3.5 2.5 2.5 2.5

3. Select indoor temperature thermostat

When connected to wired remote controller, either indoor unit thermostat or remote controller thermostat is available, using remote control setting.

9.2. Compressor Start Control

•

When the compressor start, compressor frequency will be fixed at lower level for certain time, to follow the below table, due to

• •

avoid the compressor oil discharge.

•

Judging from compressor discharge temperature, decide the start conditio n to select either cool start control, or warm start

• •

control.

Discharge temp. [°C] >15°C 15°C

Start control Cool start Warm start

Warm start : set 1→*set 5→normal control

Cool start : set 1→set 2→set 3→set 4→*set 5→normal control

•

Note

• •

−

Frequency at *set 5 = frequency calculated by normal control

− −

−

In case of frequency at set n excess the frequency at set 5 in cool condition, skip from set n to set 4 and transfer to set 5.

− −

9.3. Cooling Operation

9.3.1. Cool indoor fan control

•

Fan speed manual

• •

Common control for unit using DC motor / unit using AC motor.

Operation start at hi speed, or medium speed, or low speed set by remote control.

•

Fan speed auto

• •

When operation start, or shifting to thermostat ON condition from thermostat OFF condition, odour cut operation (refer odour cut operation page for detail), after thermostat ON condition, indoor fan operate as below control.

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

−

Unit using DC motor

− −

As follow the below figure, fan speed changing operation (program air).

(rpm center B and

−

Unit using AC motor

− −

is differen t if capacity rank is different)

When 1st thermostat on condition from operation start, fan speed is hi (same as manual fan speed), after 2nd thermostat on condition, fan speed change to medium speed (same as manual medium fan speed).

9.3.2. Odour cut control

•

When cool or dry mode operation start, select odour cut mode or fan auto mode, by remote control, operation start at odour

• •

wash mode when compressor start or shift to thermostat on from thermostat off.

•

Odour cut operation is under below conditio n.

• •

Operation mode Cool or dry mode Odour wash setting Setting No setting

Fan setting Auto Odour cut Odour cut

Manual Odour cut -

•

Odour cut operation is to remove the odour generated at indoor heat exchanger to use the drain water come out from indoor

• •

heat exchanger.

Thermo & comp ON/OFF Thermostat ON & comp ON Thermostat ON Thermostat ON & comp ON

Time 40 [Sec] 50 [Sec] - 20 [Sec] 120 [Sec] 20 [Sec] 40 [Sec] 50 [Sec] -

Cool Auto DC motor OFF SSLo Program air SSLo OFF SSLo OFF SSLo Program air

AC motor OFF Lo Hi Lo OFF Lo OFF Lo Me

Dry Auto DC motor OFF SSLo SLo SSLo OFF SSLo OFF SSLo SLo

AC motor OFF Lo Lo Lo OFF Lo OFF Lo Lo

9.3.3. Cool powerful operation

•

When cool or dry mode operation start, temperature differences between room temperature and setting temperature is more

• •

than 5 K, setting temperature shift to 2 K down.

•

(But when temperature after shifting is less than 16°C, setting temperature is 16°C = no change)

• •

•

Micro computer judge that required indoor load is bigger than calculation base from temperature differences between room

• •

temperature and setting temperature, then increase the compressor frequency compared to normal to cool down indoor side immediately.

•

Those kind of operation complete after 30 minutes when cool mode operation start.

• •

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

9.3.4. Freezing prevention control

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During cool or dry mode operation, if indoor evaporator temperature is going down, freezing prevention control is operated.

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•

Detail of Freezing prevention control is as follows;

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Indoor evaporator temperature area is divided into 5 zones, which consist of stop zone, down zone, no change zone, up zone, and recovery zone. When indoor evaporator temperature is going into each zone, compressor frequency change by followin g the below table.

Recovery zone Release freezing prevention operation Up zone Fan motor speed step up No change zone Operation no change Down zone Reduce the compressor frequency

Stop zone If continue for 6 min, compressor stop

(check for 3 min, max 3 times)

(for 3 min after stop, compressor can be started due to restart delay control)

9.3.5. Dew form prevention control

•

During cool or dry operation, if outdoor temperature is less than 30°C, and indoor fan speed is low or auto setting, indoor heat

• •

exchanger temperature become lower, dew form prevention control start to prevention dew form at indoor discharge grill.

•

Indoor evaporator temperature area is divided into 4 zones, which consist of, down zone, no change zone, up zone, and

• •

recovery zone.

•

When indoor evaporator temperature is going into each zone, change compressor frequency and louver angle by following the

• •

below table.

Recovery zone Release dew form prevention operation Up zone Fix the indoor louver angle

No change zone Continue check the indoor heat excahnger temperature Down zone Reduce the compressor frequency

Cassette type : fix the manual 3rd position Ceiling type : fix the manual 2nd position

(check for 3 min, max 3 times)

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

9.3.6. Drain pump control

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During cooling, dry, or defrost operation, drain pump operate by followin g the below table.

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•

When compressor start, drain pump operation start after 10 second of indoor fan starting.

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•

When operation stop or thermostat is off, drain pump continue operating for 6 minute to prevent the drain water from coming

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back.

9.3.7. Cooling low temperature protection control

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During cooling, or dry operation, if outdoor temperature is less than -15°C.

• •

−

And thermostat on condition continue for 15 min, compressor stop.

− −

−

After 3 min waiting (restart delay), if thermostat is on, compressor restart.

− −

9.4. Heating Mode Operation

9.4.1. Heating indoor fan control

Fan speed manual

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Fan speed [Hi] [Me] [Lo] set by remote controller.

• •

•

However, when operation start, or during operation, fan speed control is limited to due to prevent a cold draft, for example, when

• •

heating operation start.

•

(K10 = Indoor heat exchanger temperature, depend on indoor type)

• •

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

Fan speed auto

•

When operation start, or during operation, fan speed control by detecting indoor heat exchanger as follows:

• •

•

(K10 = Indoor heat exchanger temperature, depend on indoor type)

• •

9.4.2. Hot start control

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When heating operation start, hot start control carry out.

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•

During hot start operation, [PREHEAT] displayed at the wired remote controller.

• •

•

For wireless remote controller, [POWER LED] is blinking at the receiver of indoor unit. Indoor fan stop and louver angle fixed

• •

to upper side in spite of any setting of remote controller. When indoor heat exchanger temperature increase, or 4 minute past after operation start, hot start control finish and shift to normal fan control.

9.4.3. Heating indoor fan control at thermostat off heating mode operation

•

During heating operation, if thermostat is off, indoor fan fixed low speed, Louver angle fixed upper side, even if remote control

• •

display shows any angle.

(cassette and ceiling model only)

9.4.4. Heating powerful operation

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When heating mode operation start, temperature differen ces between setting temperature and room temperature is more than

• •

5 K, setting temperature increase 2 K and operation start.

(however, setting temperature after shifting is more than 31°C, setting temperature fixed 31°C.)

•

Due to this control, micro computer judge indoor heat loss is big and increase compressor frequency compare to normal

• •

condition, then heat up indoor room quickly.

•

This control will be finished after 60 min or thermostat is off.

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9.4.5. Defrost control

•

During heating operation at outdoor low temperature condition, defrost operation start timely to melt the ice formed on outdoor

• •

heat exchanger.

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When heating operation accumulated time is time up, and both outdoor temperature and outdoor unit heat exchanger

• •

temperature is less than setting temperature for 5 minute. When defrost temperature is more than setting temperature, defrost operation finish.

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During defrost operation, in spite of any change of remote controller, indoor fan stop and louver angle fixed at upper side.

• •

(for louver control : cassette and ceiling model only)

•

During defrost operation, [DEFROST] is display ed at wired remote controller (when using wireless controller, POWER LED is

• •

blinking in receiver of indoor unit), hot start operate after defrost operation finish.

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

9.4.6. Heating high temperature protection

•

During heating operation, when outdoor temperature is more than 35°C for 15 minute, compressor stop to protect compressor.

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•

After 3 minute (re-start delat control) waiting, if thermostat on condition, outdoor unit re-start.

• •

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

9.5. Louver Control

9.5.1. Louver control for cassette type

•

When power is on, at the same time, louver start initializing toward to close Direction.

• •

•

During operation, stopping, thermostat off condition, louver angle set manual or auto depend on remote controller setting.

• •

−

Louver manual setting

− −

Operation mode Display manual

Set 1 Set 2 Set 3 Set 4

Normal 20° 35° 50° 70°

Heating Defrost 10°

Hot start 10°

Thermostat off 20°

Fan 20° 35° 50° 70°

Cooling Normal 20° 35° 50° 70°

(fan) Dew control 50°

Thermostat off 20° 35° 50° 70°

Normal 30°

Dry Dew control 50°

Thermostat off 20° 35° 50° 70°

Operation mode judge 20° 35° 50° 70°

Stop mode 0°

−

Louver auto setting

− −

Operation Display auto set

AUTO 1 AUTO 2 AUTO 3

A 70° 70° 70°

Normal Sensor B 20° - 70° 20° - 50° 40° - 70°

Heating C 20° 20° 20°

Defrost 10°

Hot start 10°

Thermostat off 20°

Fan 20° - 70° 20° - 50° 40° - 70°

Cooling Normal 20° - 70° 20° - 50° 40° - 70°

(Fan) Dew control 50°

Thermostat off 20° - 70° 20° - 50° 40° - 70°

Normal 30°

Dry Dew control 50°

Thermostat off 20° - 70° 20° - 50° 40° - 70° Operation mode judge 20° 20° 20° Stop mode 0°

•

Temperature range for louver control during heating operation is as follows; decide by indoor heat exchanger temperature.

• •

AUTOBW1 AUTOBW2 AUTOBW3 AUTOBW4

60°C 57°C 30°C 25°C

CS-F24DB4E5 CU-L24DBE5 / CS-F2 8DB4E5 CU- L28DBE5

9.5.2. Ceiling type louver control

•

When power is on, at the same time, louver initialize 2 times.

• •

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During operation, stopping, thermostat is off condition, louver angle change as below table by manual setting or auto setting of

• •

remote controller.

Remote controller setting Manual Auto

Operation mode Display

Set 1 Set 2 Set 3 Set 4 Piping temp (heating)

A B C

Normal 20° 35° 50° 70° 70° 20° - 70° Set 1

Heating Defrost 20°

Hot start 20°

Thermostat off 20°

Fan 20° 35° 50° 70° 20° - 70°

Cooling Normal 20° 35° 50° 70° 20° - 70°

(fan) Dew control 35°

Thermostat off 20° 35° 50° 70° 20° - 70°

Normal 35°

Dry Dew control 35°

Thermostat off 20° 35° 50° 70° 20° - 70° Operation mode judge 20° 35° 50° 70° 20° Stop mode 70°

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