When main power supply switch is on, the P.C. board will automatically memorize 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.

1.4.1.

Operation range

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 CUJ18DBE5 Unit Main Power Phase, Volts 1 ~ ~ ~ 240 Hz 50 Max. 264 Applicable Voltage Min. 216

1.4.2.

Indoor and Outdoor Temperature

Model 50Hz CU-J18DBE5

Operating Cooling Hz 50 Indoor Temp. (D.B./W.B.) (C) Max. Min. 32/23 21/15 Outdoor Temp. (D.B./W.B.) (C) Max. Min. 43/-5/-

2 Features

2.1.1.

Ceiling Type

Easier Maintenance and Cleaning
Anti-Mould Long Life Air Filter. 3-Direction Pipe Lead-Out.

2.1.2.

Wide Air Discharge, Comfortable Control
Wide-Angle Airflow 100 Degrees Horizontal. Auto Swing Louver.

2.2.1.

Outdoor Unit
Flexible Installation in Smaller Spaces
Long Pipe design with maximum piping length of 30m. Flexible 4-way piping.
Centralized Drain Method gathered multiple outdoor units drain pipes into a single drain pipe to makes installation easier and also improve appearance.
Side-by-Side Continuous Installation is possible even outdoor units with different capacities.

2.2.2.

Quiet, Efficient Design
A host of silencing technologies achieves super-quiet operation. The Noise-Suppressing Winglet Fan is a result of new research into vane design theory. The unique curved shaped suppressed the generation of vortexes, thus reduces air flows noise.
Operating efficiency is improved and energy consumption reduced.

2.2.3.

Low Ambient Cooling Operation
The unit can set for cooling even when the outdoor temperature drops to -10C. This is ideal for location such as non-residential computer room (where the temperature is not less than 21C and humidity is not more than 45%) that require cooling even in winter.

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.)

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)

To set B (Wednesday - Individual day setting) - Press UP or DOWN button to select WED (Wednesday). Then press SELECT button. To set the time, please refer to step 3. Select time at page 22. - 1st program - press SET button twice (confirm ON and 9:00) 2nd program - also press SET button twice. (Confirm OFF and 16:00) 3rd program - select OFF and desired time to 12:30 4th program - select ON and desired time to 13:30 5th ~6th program - press CANCEL button
To set C (Saturday - Individual day setting) - Follow the same step as above. To set the time, please refer to step 3. Select time at page 22. - 1st program - select ON, desired time to 10:00 and desired temperature to 20C. 2nd program - select OFF and desired time to 14:00. 3rd ~ 6th program - press CANCEL button.
- Final Display for Weekly timer may show as: (Display is showing, 9:00 ON - Timer on Wednesday will be activated next because it is nearest the current day/time.)
Note: Timer that has setting nearest to current time and day will be activated first. To check the setting timer, press SELECT button, then UP or DOWN button to select day. The display will show each program for the selected day. To reset the setting for all, press SELECT button, then ensure all day setting with triangle mark. Then press CANCEL button for all the programs.

Address number display

Operation selection display
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. 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, FAN, COOL or DRY. TEMP (UP/DOWN) buttons Used to select the desired temperature. ECONOMY operation button Temperature setting display (16C - 31C)
Transmitter Transmits the remote control signal. Airflow direction setting display

Fan speed display

Time/time setting display Shows the timer operation setting time or the current time.
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)

10 Installation Instruction

10.1. Pipe length

CORRECTION OF CAPACITIES 1. Correction of capacities according to the connecting pipe length. The data of rated capacities (marked on the name plate) are based on 7.5 meters connecting pipe and horizontal installation.
2. For other pipe length of other installation multiply by the following correction factor to determine the revised cooling capacity.
Piping Size / Length & Elevation Piping Piping size Piping elevation length (B) (A) Valve Gas / Valve Max(m) Max(m) Low

Model No.

Liquid / High Cassette type R 0 A
Piping elevation (C) Max(m)

Piping Chargeless Max(m)

Add Refrigerant (g/m)

CS-F18DTE5

3-ways
Note : Piping elevation B = outdoor unit installed at top Piping elevation C = outdoor unit installed at bottom
10.2. Refrigerant additional charge
1. Piping installation by standard piping At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 20m. (Refer the following table) But when the piping length exceeds 20m, additional charge is required according to the following table. Example: CU-J18DBE5 In case of 30m long pipe (one way), the amount of refrigerant to be replenished is: (30 - 20) x 20 = 200g
Model Name Liquid piping (dia.mm) 6.35 Standard piping specification Gas piping Gas chargeless (dia.mm) length (m) 12.7 20
Additional gas volume (g/m) 20
10.3. Position of the centre gravity

MODEL NAME CU-J18DBE5

OUTSIDE DIMENSIONS WIDTH (mm) DEPTH (mm) HEIGHT (mm) 795

NET WEIGHT kg 69

CENTRE OF GRAVITY X (mm) Y (mm) Z (mm) 320
10.4. Indoor unit installation
CEILING TYPE AIR CONDITIONERS INSTALLATION INSTRUCTIONS
Precautions in terms of safety
Carry out installation work with reliability after throughout reading of this Precautions in terms of safety.
Precautions shown here are differentiated between Warnings and Cautions. Those that have much chance for leading to significant result such as fatality or serious injury if wrong installation would have been carried out are listed compiling them especially into the column of Warnings.
However, even in the case of items which are listed in the column of Cautions, such items also have a chance for leading to significant result depending on the situations. In either case, important descriptions regarding the safety are listed, then observe them without fail. As to indications with illustration

The installation position must be able to support a load four times the indoor unit weight. Warnings The installation location (surface that the unit is suspended from) must be horizontal (and guaranteed to stay horizontal). The indoor unit must be away from heat and steam sources, but avoid installing it near an entrance. The indoor unit must allow easy draining. The indoor unit must allow easy connection to the outdoor unit. The indoor unit must be at least 3m away from any noise-generating equipment. The electrical wiring must be shielded with a steel conduit. 9. If the power supply is subject to noise generation, add a suppressor. 10. Do not install the indoor unit at a laundry. Electric shocks may result.

3. 4. 5. 6. 7. 8.

NOTE Study throughly the following installation locations. 1. In places such as restaurants and kitchens, considerable amount of oil steam and flour adhere to the fan, and the fin of the heat exchanger may result in heat exchange reduction, spraying or dispersing of water drops, etc. In these cases, take the following actions: Make sure the ventilation fan for smoke-collection hood on a cooking table has sufficient capacity so that it draws oily steam which should not flow into the suction of the air conditioner. Make enough distance from cooking room to install the air conditioner in such place where it may not suck in oily steam.

2. 3. 4. 5.

Avoid installing the air conditioner in such circumstances where cutting oil mist or iron powder exist especially in factories, etc. Avoid places where inflammable gas can be generated, flows-in, contaminated, or leak. Avoid places where sulphurous acid gas or corrosive gas can be generated. Avoid places near high frequency generators.
10.4.3. Installation of indoor unit
The paper template for installation may expand or shrink according to temperature and humidity. Check the dimensions before using it.
CEILING OPENING DIMENSIONS AND HANGING BOLT LOCATION

Caution

During the installation, care must be taken not to damage the electric wires.
REMOVING THE SIDE COVER AND HANGING BRACKET
1. Open the inlet grille, and remove the side cover fixing screw (right and left) from the internal part of the unit. 2. Move the side cover to about 15mm forward to remove it. Use the packing material (Styrene foam) to support, when you reverse the top and bottom of the indoor unit. 3. Remove the hanging bracket a. Remove the slip prevention screws of the brackets (right and left). b. Loosen the hanging bracket fastening bolts to about 10mm, and remove the hanging bracket.

13. If installing more than one outdoor unit, allow enough space around each unit as shown below.
Maintain sufficient space above the unit. Values inside brackets indicate distances when installing the 4HP - 6HP. The distance given above are the minimum distance required in order to maintain proper performance. Allow as much space as possible in order to get the best performance from the units.
10.5.5. Transporting and installing the outdoor unit
Transporting 1. The outdoor unit should be transported in its original packaging as close to the installation location as possible. 2. If suspending the outdoor unit, use a rope or belt, and use cloth or wood as padding in order to avoid damaging the unit. Installation 1. Read the Selecting the outdoor unit installation location section thoroughly before installing the outdoor unit. 2. If installing the unit to a concrete base or other solid base, use M10 or W3/8 bolts and nuts to secure the unit, and ensure that the unit is fully upright and level. (The anchor bolt positions are shown in the diagram at the right side.) In particular, install the unit at a distance from the neighbouring building which conforms to regulations specified by local noise emission regulation standards. 3. Do not install the outdoor unit to the buildings roof. 4. If there is a possibility that vibration may be transmitted to the rooms of the building, place rubber insulation between the unit and the installation surface. 5. Drain water will be discharged from the outdoor unit when operating the system in heating or defrosting modes. Select an installation location which will allow the water to drain away properly, or provide a drainage channel so that the water can drain away. (If this is not done, the drain water may freeze during winter, or the water may spill down to areas underneath the installation location.)
If a drain pipe needs to be installed, insert the accessory drain elbow into the mounting hole at the bottom of the outdoor unit, and connect a hose with an inside diameter of 15mm to this drain elbow. (The hose is not supplied.) If using the drain elbow, install the outdoor unit on a base which is at least 5cm high.

4. After piping connection has been completed, make sure that the joint areas of the indoor and outdoor units are free from gas leakage by the use of nitrogen, etc. 5. Air purge within connection piping shall be carried out by evacuation. 6. Close the tube joining area with putty heat insulator (local supply) without any gap as shown in below figure. (To prevent insects or small animal entering)

10.5.7. Heat insulation

Use a material with good heat-resistant properties as the heat insulation for the pipes. Be sure to insulate both the Caution gas-side and liquid-side pipes. If the pipes are not adequately insulated, condensation or water leakages may occur.
Liquid-side pipes Gas-side pipes
Material that can withstand 120C or higher
10.5.8. Charging with refrigerant
1.5 HP 2 HP (type) At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 20m. If the equivalent pipe length used will be 20m or less, no additional charging will be necessary. If the equivalent pipe length will be between 20 and 30m, charge with additional refrigerant according to the equivalent length given in the table below. 2.5 HP ~ 6 HP (24 ~ 50 type) At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 30m. If the equivalent pipe length used will be 30m or less, no additional charging will be necessary. If the equivalent pipe length will be between 30 and 50m, charge with additional refrigerant according to the equivalent length given in the table below.
Model 1.5 HP 2 HP (type) 2.5 HP ~ 6 HP (24 ~ 50 type) Additional charging amount 0.02 kg/m 0.05 kg/m Equivalent length 30m 50m
Pump down operation - Operate the pump down according to the following procedures.
Procedure 1. Confirm the valve on the liquid side and the gas side is surely open. 2. Press the PUMP DOWN switch on outdoor printed board for 1 second or more. 3. Shut the valve on the liquid side surely. Notes Perform the cooling operation for five minutes or more. When the valve is shut halfway, the compressor is occasionally damaged.

10.5.9. Electrical wiring
The units must be connected to the supply cables for fixed wiring by qualified technician. Feed the power source to the unit via a distribution switch board designed for this purpose, the switch should disconnected all poles with a contact separation of at least 3mm. When the supply cable is damaged, it must be replaced by qualified technician. Be sure to install a current leakage breaker, main switch and fuse to the main power supply, otherwise electric shocks may result. Be sure to connect the unit to secure earth connection. If the earthing work is not carried out properly, electric shocks may result. Wiring shall be connected securely by using specified cables and fix them securely so that external force of the cables may not transfer to the terminal connection section. Imperfect connection and fixing leads to fire, etc.
Connect the power supply wiring and indoor/outdoor unit connection wiring according to the electrical circuit diagram instructions. Clamp the wires securely to the terminal connections using cord clamps so that no undue force is placed on the wires. Once all wiring work has been completed, tie the wires and cords together with the binding strap so that they do not touch other parts such as the compressor and pipes.

1. 2. 3. 4. 5. 6.

Connect the power supply line to a 3-phase/380-415V (or single-phase 220-240V) power supply. The equipment shall be connected to a suitable mains network with a main impedance less than the valve indicated in the table of power supply specifications. Be sure to connect the wires correctly to terminal board with connecting the crimp type ring terminal to the wires. The binding screws inside the power supply box may become loosened due to vibration during transportation, so check that they are tightened securely. Tighten the binding screws to the specified torque while referring to the table below. If connecting two separate wires to a single crimped terminal, place the two crimped terminal wires together as shown in Fig. A. (If the arrangement shown in Fig. B is used, poor contacts or contact damage may result.)
If momentarily turning on the power supply for both the indoor and outdoor units, do not turn the power off again until at least 1 minute has passed (except when a reversed phase has been detected).
Use only the specified cables for wiring connections. Connect the cable securely, and secure them properly so that no undue force will be applied to the terminal connections. If the terminals are loose or if the wires are not connected securely, fire may result.

Terminal screw M3 M4 M5

Tightening torque N.cm {kgf.cm} 69 ~ 98 {7 ~ 10} 157 ~ 196 {16 ~ 20} 196 ~ 245 {20 ~ 25}

10.6.3. Remote controller installation
Be sure to turn off the main power before installing and connecting the remote controller. (If the remote controller is connected while the power is still turned on, the remote controller displays may not appear.) If no displays appear on the remote controller, check while referring to If no remote controller displays appear in 5 Test operation. The remote control cable is live during use, so please be careful with it.

Remote controller wiring

Connect the indoor unit and the remote controller as shown in the illustration below. The remote control cable is non-polar. At the time of shipment from the factory, the connector cable used to connect the terminal block and connector CN1 is disconnected. When connecting the remote controller wiring and installing the remote controller, be sure to connect the cord to the connector CN1.
Extending the remote control cable
Solder a sheathed PVC cord or cable (0.5 - 2 mm2) with specifications among those given below to the remote controller end of the accessory remote control cable (10 m).
* * * PVC round cabtire cord 600V PVC-insulated PVC sheathed round cable 600V PVC-insulated PVC sheathed flat cable IEC 502 IEC 227-4 IEC 227-4
The maximum possible length for the remote control cable is 200 m.
Remote controller installation procedure
Remove the remote controller lower case. (Insert a flat-tipped screw driver or similar 2 to 3 mm into one of the gaps at the bottom of the case, and then twist the screw driver to open. [Refer to the illustration below.]) Be careful not to damage the lower case.
Secure the lower case to the wall or outlet box. (Refer to the illustration at right for the embedded and exposed positions for remote control cable.) NOTE - Be sure to use only the accessory screws. - Do not bend the lower case when tightening the screws. (If the screws are overtightened, damage may result.) - Do not remove the protective tape which is affixed to the upper case circuit board.
If installing the remote controller with the remote control cable exposed, use pliers to cut a notch into the upper case. (The feeding-out direction can be either up or to the left or right) Strip the end of the remote control cable which is to be connected to the remote controller. (Refer to the illustration below)
Route the remote control cable inside the lower case in accordance with the intended feeding- out direction. (Refer to the illustration below.) Securely connect connector CN1. (If it is not connected the remote controller will not operate.)
NOTE After connecting the connector, do not suspend the upper case by its own weight, otherwise the connector cord may break.
If controlling using two remote controllers, refer to Control using two remote controllers in 4 Settings. Secure the upper case to the lower case. (Hook the upper tab of the upper case into the lower case, and then push the upper case until it snaps shut onto the lower case tab, while being careful not to clamp the remote control cable and the connector cord.)

10.7.1. Accessories supplied with the wireless remote controller

No. 1. 2. 3. 4. 5. 6. 7.

Name Wireless Remote Controller R03 battery Holder (For securing remote controller) Holder fixing screw Receptor unit (For Cassette Type) Receptor unit (For Ceiling Type) Installation manual

Qty Cassette Ceiling 1 1

10.7.2. Points and notes regarding wireless remote controller setting-up location
The wireless remote controller can be used to operate indoor units at a maximum range of 8 metres from directly facing infront of the indoor unit. If the remote controller is at an angle to the receptor unit, the operation range may become shortened. The accessory receptor unit must be attached to the veneer panel. The receptor unit for the wireless remote controller should be in a place where it will not be affected by direct light from fluorescent lights. (Refer to the illustration below.) (If using an inverter-type fluorescent light, keep the receptor unit at least 1m away from the light, otherwise remote control operation may not work properly.)
If installing in a place where a power supply is generating electromagnetic noise, take measures such as installing a noise filter. Install at least 3m away from any noise sources, and shield the electric cables using an iron conduit pipe. Install at least 1m away from equipment such as TVs and radios. (Otherwise picture distortion or static may occur.)
Wireless remote control installation procedure
Installing the wireless remote controller to a wall (for remote control storage).
If using a single remote controller to operate several air conditioners, address setting will be required. (Refer to later in this manual.) For twin and triple types, install to the main unit only. (Accordingly, the installation and wiring operations described later in this manual are for the main unit only.)

Inserting the batteries

Remove the battery compartment cover of the wireless remote controller, and then insert the two accessory R03 size batteries. (Be sure not to make a mistake with the polarities.) NOTE The accessory batteries are to be used when checking operation. They should be replaced with new batteries as soon as possible. (Be sure not to make a mistake with the polarities.)

11.4.5.

Recharging refrigerant during servicing
When recharging is necessary, insert the specified amount of new refrigerant in accordance with the following procedure. 1. Connect the charging hose to the service port of the outdoor unit. 2. Connect the charging hose to the vacuum pump adaptor. At this time, fully open the 2-way valve and 3-way valve. 3. Fully open the handle Lo of the manifold gauge, turn on the power of the vacuum pump and continue the vacuum process for at least one hour. 4. Confirm that the low pressure gauge shows a reading of -0.1 MPa (-76 cmHg), then fully close the handle Lo, and turn off the vacuum pump. Wait for 1-2 minutes, then check to make sure that the needle of the Low pressure gauge has not returned. See Fig. 13 for the remaining steps of this procedure. 5. Set the refrigerant cylinder onto the electronic scale, then connect the hose the cylinder and to the connection port for the electronic scale. (1)(2)

6. 7. 8. 9.

10. 11. 12.
Precaution: Be sure to set up the cylinder for liquid charging. If you use a cylinder equipped with a siphon tube, you can charge the liquid without having to turn the cylinder around Remove the charging hose of the manifold gauge from the vacuum pump adaptor, and connect it to the connection port of the electronic scale. (2)(3) Open the valve of the refrigerant cylinder, then open the charging valve slightly and close it. Next, press the check valve of the manifold gauge and purge the air. (2)(4) (Watch the liquid refrigerant closely at this point.) After adjusting the electronic scale to zero, open the charging valve, then open the valve Lo of the manifold gauge and charge with the liquid refrigerant. (2)(5) (Be sure to read the operating instructions for the electronic scale.) If you cannot charge the stipulated amount, operate the unit in the cooling mode while charging a little of the liquid at a time (about 150 g/time as a guideline). If the charging amount is insufficient from one operation, wait about one minute, then use the same procedure to do the liquid charging again. Precaution: Never use the gas side to allow a larger amount of liquid refrigerant to be charged while operating the unit. Close the charging valve, and after charging the liquid refrigerant inside the charging hose, fully close the valve Lo of the manifold gauge, and stop the operation of the unit. (2)(5) Quickly remove the charging hose from the service port. (6) If you stop midway through, the refrigerant that is in the cycle will be discharged. After putting on the caps for the service port and operating valve, inspect around the caps for a gas leak. (6)(7)
Fig. 13 Re-charging refrigerant

11.4.6.

Brazing
As brazing requires sophisticated techniques and experiences, it must be performed by a qualified person. In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to proceed with brazing while letting dry nitrogen gas (N2) flow. <Brazing Method for Preventing Oxidation> 1. Attach a reducing valve to the nitrogen gas cylinder. 2. Apply a seal onto the clearance between the piping and inserted pipe for the nitrogen gas in order to prevent the nitrogen gas from flowing backward. 3. When the nitrogen gas is flowing, be sure to keep the piping end open. 4. Adjust the flow rate of nitrogen gas so that it is lower than 0.05 m3/h, or 0.02 MPa (0.2 kgf/cm2) by means of the reducing valve. 5. After taking the steps above, keep the nitrogen gas flowing until the piping cools down to a certain extent (i.e. temperature at which pipes are touchable with finger). 6. Completely remove the flux after brazing.
Fig. 14 Prevention of Oxidation during Brazing
Cautions during brazing 1. General Cautions a. The brazing strength should be high as required. b. After operation, airtightness should be kept under pressurized condition. c. During brazing do not allow component materials to become damaged due to overheating. d. The refrigerant pipe work should not become blocked with scale or flux. e. The brazed part should not restrict the flow in the refrigerant circuit. f. No corrosion should occur from the brazed part. 2. Prevention of Overheating Due to heating, the interior and exterior surfaces of treated metal may oxidize. Especially, when the interior of the refrigerant circuit oxidizes due to overheating, scale occurs and stays in the circuit as dust, thus exerting a fatally adverse effect. So, make brazing at adequate brazing temperature and with minimum of heating area. 3. Overheating Protection In order to prevent components near the brazed part from overheating damage or quality deterioration due to flame or heat, take adequate steps for protection such as (1) by shielding with a metal plate, (2) by using a wet cloth, and (3) by means of heat absorbent. 4. Movement during Brazing Eliminate all vibration during brazing to protect brazed joints from cracking and breakage. 5. Oxidation Preventative In order to improve the brazing efficiency, various types of antioxidant are available on the market. However, the constituents of these are widely varied, and some are anticipated to corrode the piping materials, or adversely affect HFC refrigerant, lubricating oil, etc. Exercise care when using an oxidation preventive.

The F15-44 display will change to the detail display.
How to display the past error message. If the CHECK display on the wired remote control is not flashing, press the CHECK button continuously for 5 seconds or more to display the past problem details.
12.3.5. Test operation using the receiver auto button (If using wireless remote controller)
12.4. Emergency operation
When using the wireless remote control and losing the remote controller, emergency operation can be operated by pressing auto button in the receiver. Press the auto button continuously within 5 seconds
Press the auto button continuously within 5 seconds emergency operation Press the auto button continuously for more than 5 seconds to less than 8 seconds cooling test operation Press the auto button continuously for more than 8 seconds to less than 11 seconds cooling test operation Press the auto button continuously for more than 11 seconds to less than 16 seconds set remote controller address Press the auto button continuously for more than 16 seconds to less than 21 seconds remote controller address confirmation mode Press the auto button continuously for more than 21 seconds to less than 26 seconds change address of branch unit Press the auto button continuously for more than 26 seconds to less than 31 seconds individual change mode During the above each stage, finally press the SET button, then the operation mode can be decided. If there is an abnormality in the temperature thermistor (disconnect or shorted), indoor unit cannot be operated. If abnormality detected in the indoor or outdoor unit, turn off the main power supply and find the cause. Check the resistance of each thermistor of both indoor and outdoor units by referring the resistance table as follows. Thermistor resistance table
Resistance value (k)5% Temperature C -20 -10 -60 Indoor Room temperature thermistor 158.5 87.5 66.1 50.5 38.9 30.3 23.8 18.12.5.4 3.7 Pipe temperature thermistor 211.3 116.7 88.2 67.3 51.9 40.4 31.7 25.16.1 10.6 7.Outdoor Discharge temperature Pipe temperature thermistor thermistor 528.3 47.9 291.8 27.1 220.5 20.7 168.3 15.9 129.8 12.4 100.9 9.8 79.2 7.7 62.7 6.5 40.26.5 2.7 17.9 1.9 12.4 1.3
Resistance value (k)5% Temperature C Indoor Room temperature thermistor Pipe temperature thermistor 3.5 2.5 1.9 1.4 Outdoor Discharge temperature Pipe temperature thermistor thermistor 8.8 0.9 6.3 4.7 3.5 -
During outdoor unit emergency operation or test operation, the LED on the P.C.B. will flash.
12.5. Self-diagnosis error code table
The display screen on the wired remote control unit and the self-diagnosis LEDs (green) on the outdoor unit printed circuit board in the outdoor unit can be used to indicate where the location of a problem is. Refer to the table below to remove the cause of the problem, and then re-start the air conditioner system. If the problem disappears and operation returns to normal, the CHECK display on the remote control unit will switch off, but the self-diagnosis LED will remain illuminated until operation is resumed. illuminated.

Wired remote control unit display Abnormal Detail dispaly dispaly F15 -01 F16 -01
Outdoor unit printed circuit board LED 8

Location or problem

Check location

F17 F20

-02 -01 -02

F21 F26 F27

-01 -01 -01

-05 -01

-05 F30 -01

-01 -02 -06 -10

Drain level Float switch problem Drain pump and drain pipe, indoor unit connectors Louver switch problem Louver motor, decorative panel connection terminal, or indoor unit louver motor connectors D.C. Fan motor problem Indoor unit D.C.Fan motor or connection terminals Indoor temperature sensor prob- Indoor temperature sensor lead wire or indoor lem unit connector Remote control thermistor prob- Remote control thermistor lem Pipe temp. sensor problem Pipe temperature sensor lead wire or indoor (indoor unit) unit connector Remote control transmission Remote control unit cable and connection terproblem minals Indoor/outdoor unit disconnecIndoor/outdoor unit connection cable and tion problem connection terminals, or indoor unit power supplies (indoor side) Indoor/outdoor unit connection Indoor/outdoor unit connection wire (indoor error problem side) Indoor/outdoor unit disconnecIndoor/outdoor unit connection cable and tion problem connection terminals, or outdoor unit power supplies (outdoor side) Indoor/outdoor unit connection Indoor/outdoor unit connection wire (outdoor error problem side) System problem Total capacity for the number of indoor units is insufficient, or over. Check the total capacity and the number of indoor units Open phase, or reversed phase Check the main power supply terminal board of supply connections, or switch over any two of the power supply wires. Suction pressure protection Insufficient refrigerant or valve operation (closed) High-pressure cut-off Check the Refrigeration system 4 way valve problem Refrigerant system problem Check the 4 way valve or lead wire Valve operation (closed), or refrigerant system Compressor overcurrent protec- Open phase or lock in compressor tion Compressor discharge temp. Insufficient refrigerant protection Outdoor heat exchanger outlet Outdoor heat exchanger outlet temperature temperature sensor problem sensor (COND TEMP) lead wire, connector Compressor discharge tempera- Compressor discharge temperature sensor ture sensor problem (DIS T. TEMP) lead wire, connector High pressure switch open circuit High-pressure switch lead wire, connector problem Low pressure sensor problem Low pressure sensor lead wire, connector or valve operation (closed)

-05 -06

-21 -51

-02 -12

Wired remote control unit display Abnormal Detail dispaly dispaly F42 -11
Current detector open circuit Compressor internal protector worked
Outdoor unit current detector fault or connector Compressor fault or refrigeration system

13 Technical Data

13.1. Cooling capacity performance data