Panasonic CU-E28EKES [47/77] Relationship between the condition of the air conditioner and pressure and electric current

14.2. Relationship Between The Condition Of The Air Conditioner And

Pressure And Electric Current

• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.

Cooling Mode Heating Mode

Condition of the

air conditoner Low Pressure High Pressure Electric current

during operation

Low Pressure High Pressure Electric current

during operation

Insufficient refrigerant

(gas leakage)

Clogged capillary tube or

Strainer

Short circuit in the indoor

unit

Heat radiation deficiency of

the outdoor unit

Inefficient compression

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Air conditioner 1
Cs e24ekes cu e24eke 1
Cs e28eke cu e28eke 1
Table of contents 1
Carry out test running to confirm that no abnormality occurs after the servicing then explain to user the operation care and maintenance as stated in instructions please remind the customer to keep the operating instructions for future reference 3
Read the following safety precautions carefully before perform any servicing electrical work must be installed or serviced by a licensed electrician be sure to use the correct rating of the power plug and main circuit for the model installed the caution items stated here must be followed because these important contents are related to safety the meaning of each indication used is as below incorrect installation or servicing due to ignoring of the instruction will cause harm or damage and the seriousness is classified by the following indications 3
Safety precautions 3
The items to be followed are classified by the symbols 3
Cs e24ekes cu e24eke 5
Specifications 5
Specifications are subject to change without notice for further improvement 6
Cs e28eke cu e28eke 7
Specifications are subject to change without notice for further improvement 8
Features 9
Location of controls and components 10
Example for e24ek if the unit is installed at a 20 m distance the quantity of additional refrigerant should be 300 g 20 10 m x 30 g m 300 g 28
Indoor outdoor unit installation diagram 28
Indoor unit there should not be any heat source or steam near the unit there should not be any obstacles blocking the air circulation a place where air circulation in the room is good a place where drainage can be easily done a place where noise prevention is taken into consideration do not install the unit near the door way ensure the spaces indicated by arrows from the wall ceiling fence or other obstacles recommended installation height for indoor unit shall be at least 2 m 28
Installation instruction 28
Outdoor unit if an awning is built over the unit to prevent direct sunlight or rain be careful that heat radiation from the condenser is not obstructed there should not be any animal or plant which could be affected by hot air discharged keep the spaces indicated by arrows from wall ceiling fence or other obstacles do not place any obstacles which may cause a short circuit of the discharged air if piping length is over 10 m additional refrigerant should be added as shown in the table 28
Select the best location 28
How to fix installation plate 29
Indoor unit 29
Indoor unit installation 29
To drill a hole in the wall and install a sleeve of piping 29
Connect the cable to the indoor unit 31
Connecting the piping 32
Install the outdoor unit 32
Outdoor unit 32
Evacuation of the equipment 33
Connect the cable to the outdoor unit 34
Airflow direction 35
Basic function 35
Internal setting temperature 35
Inverter control which equipped with a microcomputer in determining the most suitable operating mode as time passes automatically adjusts output power for maximum comfort always in order to achieve the suitable operating mode the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting the compressor at outdoor unit is operating following the frequency instructed by the microcomputer at indoor unit that judging the condition according to internal setting temperature and intake air temperature 35
Once the operation starts remote control setting temperature will be taken as base value for temperature shifting processes these shifting processes are depending on the air conditioner settings and the operation environment the final shifted value will be used as internal setting temperature and it is updated continuously whenever the electrical power is supplied to the unit 35
Operation and function 35
There are two types of airflow vertical airflow directed by horizontal vane and horizontal airflow directed by vertical vanes 2 control of airflow direction can be automatic angles of direction is determined by operation mode heat exchanger temperature and intake air temperature and manual angles of direction can be adjusted using remote control vertical airflow 35
A purpose to provide quiet cooling operation compare to normal operation 36
Automatic vertical airflow direction can be set using remote control the vane swings up and down within the angles as stated above for heating mode operation the angle of the vane depends on the indoor heat exchanger temperature as figure 1 below when the air conditioner is stopped using remote control the vane will shift to close position 36
B control condition a quiet operation start condition when quiet button at remote control is pressed quiet led illuminates 36
Horizontal airflow 1 automatic horizontal airflow direction can be set using remote control the vane swings left and right within the angles as stated below for heating mode operation the angle of the vane depends on the indoor heat exchanger temperature as figure 1 below 36
Manual horizontal airflow direction can be set using remote control the angles of the vane are as stated below and the positions of the vane are as figure 2 above 36
Manual vertical airflow direction can be set using remote control the angles of the vane are as stated above and the positions of the vane are as figure 2 below when the air conditioner is stopped using remote control the vane will shift to close position 36
Quiet operation cooling mode cooling area of soft dry mode 36
Quiet operation heating 37
Quiet operation under soft dry operation dry area at soft dry mode 37
On timer control 38
Powerful mode operation 38
Auto restart control 39
Ionizer operation 39
Off timer control 39
30 seconds forced operation 40
A overheating prevention control 1 when the ipm temperature rises to 110 c compressor operation will stop immediately 40
B dc peak current control 1 when electric current to ipm exceeds set value of 30 5 a the compressor will stop operate then operation will restart after three minutes 40
Compressor operation restarts after three minutes the temperature decreases to 95 c 40
However if total outdoor unit running current exceeds y value compressor will be stopped immediately for 2 minutes 40
If the running current does not exceed x value for five seconds the frequency instructed will be increased 40
If the set value is exceeded again more than 30 seconds after the compressor starts the operation will restart after two minutes 40
If the set value is exceeded again within 30 seconds after the compressor starts the operation will restart after one minute if this condition repeats continuously for seven times all indoor and outdoor relays will be cut off 40
Ipm power transistor prevention control 40
Once the compressor starts operation it will not stop its operation for 30 seconds 2 however it can be stopped using remote control or auto switch at indoor unit 40
Protection control 40
Protection control for all operations 40
The compressor will not start for three minutes after stop of operation 2 this control is not applicable if the power supply is cut off and on again or after 4 way valve deices condition 40
The first 30 minutes of cooling operation a will be applied 40
Time delay safety control 40
Total running current control 40
When the outdoor unit total running current ac exceeds x value the frequency instructed for compressor operation will be decreased 40
Compressor overheating prevention control 41
Cooling overload control 41
Outdoor air temperature control 41
Protection control for cooling soft dry operation 41
Freeze prevention control 42
Intake air temperature control 42
Outdoor air temperature control 42
Protection control for heating operation 42
Overload protection control 43
Auto switch operation 44
Selecting the wireless remote control transmission code 44
Servicing mode 44
Indication panel 45
Note if power led is blinking the possible operations of the unit are hot start during deice operation operation mode judgment or delay on timer sampling if timer led is blinking there is an abnormality operation occurs if ionizer led is blinking there is an abnormality of ionizer occurs 45
Refrigeration cycle system 46
Troubleshooting guide 46
Carry out the measurements of pressure electric current and temperature fifteen minutes after an operation is started 47
Relationship between the condition of the air conditioner and pressure and electric current 47
Breakdown self diagnosis function 48
Self diagnosis function three digits alphanumeric code 48
Error codes table 49
Note o frequency measured and fan speed fixed 49
The memory data of error code is erased when the power supply is cut off or press the auto switch until beep sound heard following by pressing the check button at remote control although operation forced to stop when abnormality detected emergency operation is possible for certain errors refer to error codes table by using remote control or auto switch at indoor unit however the remote control signal receiving sound is changed from one beep to four beep sounds 49
Disassembly and assembly instructions 50
Cs e24ekes cu e24eke 54
Operation characteristics 54
Technical data 54
Cs e28eke cu e28eke 62
Cs e24ekes cu e24eke 70
Cs e28eke cu e28eke 70
Sensible capacity chart 70
Cs e24ekes cs e28eke 71
Exploded view and replacement parts list 71
Note all parts are supplied from phaam malaysia vendor code 061 o marked parts are recommended to be kept in stock 72
Note all parts are supplied from phaam malaysia vendor code 061 o marked parts are recommended to be kept in stock 77
Phaam printed in malaysia sfyw060 3 0 2 77

Panasonic CU-E28EKES [47/77] Relationship between the condition of the air conditioner and pressure and electric current

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