Panasonic CS-Z35UFEAW-1 Service Manual

Order No: PAPAMY1807103CE

Indoor Unit Outdoor Unit
CS-Z25UFEAW-1
CS-Z35UFEAW-1

CU-Z25UFEA-1
CU-Z35UFEA-1

Destination

N. Europe

WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the products dealt with in this service information by anyone else could result in serious injury or death.

IMPORTANT SAFETY NOTICE

There are special components used in this equipment which are important for safety. These parts are marked by in the Schematic
Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced
with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of
manufacturer.

PRECAUTION OF LOW TEMPERATURE

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

R32 REFRIGERANT

THIS PRODUCT MUST ONLY BE INSTALLED OR SERVICED BY QUALIFIED PERSONNEL.

Refer to Commonwealth, State, Territory and local legislation, regulations, codes, installation & operation manuals, before the
installation, maintenance and/or service of this product.

– This Air Conditioner contains and operates with refrigerant R32.

CAUTION

© Panasonic Corporation 2018.

TABLE OF CONTENTS

PAGE

PAGE

1. Safety Precautions ............................................. 3

2. Precaution for Using R32 Refrigerant .............. 6

3. Specifications ................................................... 10

4. Features ............................................................. 13

5. Location of Controls and Components .......... 14

5.1 Indoor Unit .................................................. 14

5.2 Outdoor Unit ............................................... 14

5.3 Remote Control .......................................... 14

6. Dimensions ....................................................... 15

6.1 Indoor Unit .................................................. 15

6.2 Outdoor Unit ............................................... 16

7. Refrigeration Cycle Diagram ........................... 17

8. Block Diagram .................................................. 18

9. Wiring Connection Diagram ............................ 19

9.1 Indoor Unit .................................................. 19

9.2 Outdoor Unit ............................................... 20

10. Electronic Circuit Diagram .............................. 21

10.1 Indoor Unit .................................................. 21

10.2 Outdoor Unit ............................................... 22

11. Printed Circuit Board ....................................... 23

11.1 Indoor Unit .................................................. 23

11.2 Outdoor Unit ............................................... 25

12. Installation Instruction ..................................... 26

12.1 Indoor Unit .................................................. 26

12.2 Outdoor Unit ............................................... 33

13. Installation and Servicing Air Conditioner

using R32 .......................................................... 36

13.1 About R32 Refrigerant ................................ 36

13.2 Characteristics of R32 Refrigerant ............. 36

13.3 Refrigerant piping installation • Tools used

in services ................................................... 38

13.4 New installation, Relocation,
Repairing of Refrigerant Cycle System

The Procedures .......................................... 42

13.5 Piping installation of R32 ............................ 43

13.6 Installation, Relocation, and Service .......... 44

13.7 Repairing of refrigerant cycle /

Brazing point ............................................... 48

13.8 <Reference> Analysis method for no error

code, no cooling / no warming .................... 54

14. Operation Control ............................................. 56

14.1 Basic Function ............................................ 56

14.2 Indoor Fan Motor Operation ....................... 57

14.3 Outdoor Fan Motor Operation .................... 58

14.4 Airflow Direction .......................................... 59

14.5 Quiet Operation (Cooling Mode/Cooling

Area of Dry Mode) ...................................... 60

14.6 Quiet Operation (Heating) .......................... 60

14.7 Powerful Mode Operation ........................... 60

14.8 Timer Control .............................................. 61

14.9 Auto Restart Control ...................................61

14.10 Indication Panel ..........................................61

14.11 nanoe™ X Operation ..................................62

14.12 +8/15°C Heat Operation .............................64

15. Protection Control ............................................65

15.1 Protection Control for All Operations ..........65

15.2 Protection Control for Cooling & Soft Dry

Operation ....................................................67

15.3 Protection Control for Heating

Operation ....................................................68

16. Servicing Mode .................................................70

16.1 Auto OFF/ON Button ..................................70

16.2 Heat Only Operation ...................................71

16.3 Remote Control Button ...............................72

17. Troubleshooting Guide ....................................75

17.1 Refrigeration Cycle System ........................75

17.2 Breakdown Self Diagnosis Function ...........77

17.3 Error Codes Table ......................................78

17.4 Self-diagnosis Method ................................80

18. Disassembly and Assembly Instructions ... 109

18.1 Remove the Front Panel ......................... 109

18.2 Remove the Front Grille .......................... 110

18.3 Remove the Discharge Grille. ................. 111

18.4 Remove the Control Board ...................... 111

18.5 Remove the Drain Pan ............................ 113

18.6 Remove the Cross Flow Fan and

Fan Motor ................................................ 113

18.7 Outdoor Electronic Controller Removal

Procedure ................................................ 115

19. Technical Data ............................................... 116

19.1 Cool Mode Performance Data ................. 116

19.2 Heat Mode Performance Data ................. 117

20. Service Data ................................................... 118

20.1 Cool Mode Outdoor Air Temperature

Characteristic ........................................... 118

20.2 Heat Mode Outdoor Air Temperature

Characteristic ........................................... 120

20.3 Piping Length Correction Factor .............. 122

21. Exploded View and Replacement Parts

List .................................................................. 123

21.1 Indoor Unit ............................................... 123

21.2 Outdoor Unit ............................................ 126

• Specifications, designs and contents in this Service Manual are subject to change without notice.

2

1. Safety Precautions

• 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.

WARNING

CAUTION

• The items to be followed are classified by the symbols:

• Explanation of symbols displayed on the indoor unit or outdoor unit.

WARNING

CAUTION

CAUTION

CAUTION

• Carry out test run 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.

Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. Any

1.
unfit method or using incompatible material may cause product damage, burst and serious injury.

Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit on veranda of a high rise building, child

2.
may climb up to outdoor unit and cross over the handrail causing an accident.

Do not use unspecified cord, modified cord, joint cord or extension cord for power supply cord. Do not share the single outlet

3.

with other electrical appliances.
Poor contact, poor insulation or over current will cause electrical shock or fire.

The appliance shall be stored, installed and operated in a well ventilated room with indoor floor area larger than A min (m
[refer Table A] and without any continuously operating ignition sources.

4.
Keep away from open flames, any operating gas appliances or any operating electric heater. Else, it may explode and cause

injury or death.

This indication shows the possibility of causing death or serious injury.

This indication shows the possibility of causing injury or damage to properties.

This symbol denotes item that is PROHIBITTED from doing.

This symbol shows that this equipment uses a flammable refrigerant.
If the refrigerant is leaked, together with an external ignition source, there is a possibility of ignition.

This symbol shows that the Operation Manual should be read carefully.

This symbol shows that a service personnel should be handling this equipment with reference to the
Installation Manual.

This symbol shows that there is information included in the Operation Manual and/or Installation Manual.

WARNING

2

)

5. Do not tie up the power supply cord into a bundle by band. Abnormal temperature rise on power supply cord may happen.

6. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.

7. Do not sit or step on the unit, you may fall down accidentally.

8. Keep plastic bag (packaging material) away from small children, it may cling to nose and mouth and prevent breathing.

When installing or relocating air conditioner, do not let any substance other than the specified refrigerant, eg. air etc mix into

9.

refrigeration cycle (piping).
Mixing of air etc. will cause abnormal high pressure in refrigeration cycle and result in explosion, injury etc.

Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, flame, sparks, or other sources of

10.

ignition.
Else, it may explode and cause injury or death.

11. Do not add or replace refrigerant other than specified type. It may cause product damage, burst and injury etc.

When connecting flare at indoor side, make sure that the flare connection is used only once, if torqued up and released, the flare must
be remade.
Once the flare connection was torqued up correctly and leak test was made, thoroughly clean and dry the surface to remove oil, dirt and

12.
grease by following instructions of silicone sealant. Apply neutral cure (Alkoxy type) & ammonia-free silicone sealant that is non-

corrosive to copper & brass to the external of the flared connection to prevent the ingress of moisture on both the gas & liquid sides.
(Moisture may cause freezing and premature failure of the connection)

3

WARNING

• For R32 model, use piping, flare nut and tools which is specified for R32 refrigerant. Using of existing (R22) piping, flare nut and

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly result in explosion and injury.

• Thickness or copper pipes used with R32 must be more than 0.8 mm. Never use copper pipes thinner than 0.8 mm.

• It is desirable that the amount of residual oil less than 40 mg/10 m.

Engage authorized dealer or specialist for installation and servicing. If installation or servicing done by the user is defective, it will cause
water leakage, electrical shock or fire.

For refrigeration system work, Install according to this installation instructions strictly. If installation is defective, it will cause water
leakage, electrical shock or fire.

Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water
leakage, fire or electrical shock.

Install at a strong and firm location which is able to withstand weight of the set. If the strength is not enough or installation is not properly
done, the set will drop and cause injury.

For electrical work, follow the national regulation, legistration and this installation instructions. An independent circuit and single outlet
must be used. If electrical circuit capacity is not enough or defect found in the electrical work, it will cause electrical shock or fire.

Do not use joint cable for indoor/outdoor connection cable. Use the specified indoor/outdoor connection cable, refer to instruction
CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor/outdoor connection. Clamp the cable so that no external
force will have impact on the terminal.
If connection or fixing is not perfect, it will cause heat up or fire at the connection.

Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will
cause heat-up or fire at connection point of terminal, fire or electrical shock.

This equipment is strongly recommended to be installed with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD),
with sensitivity of 30mA at 0.1 sec or less. Otherwise, it may cause electrical shock and fire in case of equipment breakdown or
insulation breakdown.

During installation, install the refrigerant piping properly before running the compressor. Operation of compressor without fixing
refrigeration piping and valves at opened position will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in
explosion, injury etc.

During pump down operation, stop the compressor before removing the refrigeration piping. Removal of refrigeration piping while
compressor is operating and valves are opened will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in
explosion, injury etc.

Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare
may break and cause refrigerant gas leakage.

After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic gas when the refrigerant
contacts with fire.

26. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when the refrigerant contacts with fire.

27. Be aware that refrigerants may not contain an odour.

This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and

28.
telephone. Otherwise, it may cause electrical shock in case of equipment breakdown or insulation breakdown.

29. Do not modify the machine, part, material during repairing service.

30. If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit.

31. Do not wrench the fasten terminal. Pull it out or insert it straightly.

32. Must not use other parts except original parts describe in catalog and manual.

CAUTION

Do not install the unit in a place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding

1.
of the unit, it may cause fire.

2. Prevent liquid or vapor from entering sumps or sewers since vapor is heavier than air and may form suffocating atmospheres.

Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts.

3.
Take care of the liquid refrigerant, it may cause frostbite.

4. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

5. Do not touch the sharp aluminium fin, sharp parts may cause injury.

Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the

6.
furniture.

Select an installation location which is easy for maintenance.

7.

Incorrect installation, service or repair of this air conditioner may increase the risk of rupture and this may result in loss damage or injury
and/or property.

4

CAUTION

Power supply connection to the room air conditioner.
Use power supply cord 3 x 1.5 mm
Connect the power supply cord of the air conditioner to the mains using one of the following method.
Power supply point should be in easily accessible place for power disconnection in case of emergency.
In some countries, permanent connection of this air conditioner to the power supply is prohibited.

8.

1) Power supply connection to the receptacle using power plug.
Use an approved 15/16A (1.0 ~ 1.5HP) power plug with earth pin for the connection to the socket.

2) Power supply connection to a circuit breaker for the permanent connection.
Use an approved 16A (1.0 ~ 1.5HP) circuit breaker for the permanent connection. It must be a double pole switch with a minimum

3.0 mm contact gap.

9. Installation or servicing work: It may need two people to carry out the installation or servicing work.

Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher.
Please use a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F

10

(370 ± 10°C).
Pb free solder will tend to splash when heated too high (about 1100°F / 600°C).

Do not touch the sharp aluminum fins or edges of metal parts.

11.

If you are required to handle sharp parts during installation or servicing, please wear hand glove.
Sharp parts may cause injury.

Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may

12.
break and cause refrigerant gas leakage.

2

(1.0 ~ 1.5HP) type designation 60245 IEC 57 or heavier cord.

13. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.

5

2. Precaution for Using R32 Refrigerant

• The basic installation work procedures are the same as conventional refrigerant (R410A, R22) models.
However, pay careful attention to the following points:

WARNING

Since the working pressure is higher than that of refrigerant R22 models, some of the piping and installation and service tools are
special.
(See “2.1. Special tools for R32 (R410A)”.)

1.
Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model, always replace the conventional piping and flare

nuts with the R32 and R410A piping and flare nuts on the outdoor unit side.
For R32 and R410A, the same flare nut on the outdoor unit side and pipe can be used.

Models that use refrigerant R32 and R410A have a different charging port thread diameter to prevent erroneous charging with

2.

refrigerant R22 and for safety.
Therefore, check beforehand. [The charging port thread diameter for R32 and R410A is 12.7 mm (1/2 inch).]

Be more careful than R22 so that foreign matter (oil, water, etc.) does not enter the piping.

3.
Also, when storing the piping, securely seal the opening by pinching, taping, etc. (Handling of R32 is similar to R410A.)

CAUTION

Installation (Space)

• Must ensure the installation of pipe-work shall be kept to a minimum. Avoid use dented pipe and do not allow acute bending.

• Must ensure that pipe-work shall be protected from physical damage.

• Must comply with national gas regulations, state municipal rules and legislation. Notify relevant authorities in accordance with all

1.

2.

applicable regulations.

• Must ensure mechanical connections be accessible for maintenance purposes.

• In cases that require mechanical ventilation, ventilation openings shall be kept clear of obstruction.

• When disposal of the product, do follow to the precautions in #12 and comply with national regulations.

• In case of field charge, the effect on refrigerant charge caused by the different pipe length has to be quantified, measured and

labeled.
Always contact to local municipal offices for proper handling.

Servicing

2-1. Service personnel

• Any qualified person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from

an industry-accredited assessment authority, which authorizes their competence to handle refrigerants safely in accordance with
an industry recognised assessment specification.

• Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the

assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable
refrigerants.

• Servicing shall be performed only as recommended by the manufacturer.
2-2. Work

• Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of

ignition is minimised.

• For repair to the refrigerating system, the precautions in #2-2 to #2-8 must be followed before conducting work on the system.

• Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor being present while

the work is being performed.

• All maintenance staff and others working in the local area shall be instructed and supervised on the nature of work being carried

out.

• Avoid working in confined spaces.

• Wear appropriate protective equipment, including respiratory protection, as conditions warrant.

• Ensure that the conditions within the area have been made safe by limit of use of any flammable material. Keep all sources of

ignition and hot metal surfaces away.

2-3. Checking for presence of refrigerant

• The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of

potentially flammable atmospheres.

• Ensure that the leak detection equipment being used is suitable for use with flammable refrigerants, i.e. non sparking, adequately

sealed or intrinsically safe.

• In case of leakage/spillage happened, immediately ventilate area and stay upwind and away from spill/release.

• In case of leakage/spillage happened, do notify persons downwind of the leaking/spill, isolate immediate hazard area and keep

unauthorized personnel out.

2-4. Presence of fire extinguisher

• If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment

shall be available at hand.

• Have a dry powder or CO

fire extinguisher adjacent to the charging area.

2

6

CAUTION

2-5. No ignition sources

• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has
contained flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion.
He/She must not be smoking when carrying out such work.

• All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing,
removing and disposal, during which flammable refrigerant can possibly be released to the surrounding space.

• Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or
ignition risks.

• “No Smoking” signs shall be displayed.

2-6. Ventilated area

• Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work.

• A degree of ventilation shall continue during the period that the work is carried out.

• The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.

2-7. Checks to the refrigeration equipment

• Where electrical components are being changed, they shall be fit for the purpose and to the correct specification.

• At all times the manufacturer’s maintenance and service guidelines shall be followed.

• If in doubt consult the manufacturer’s technical department for assistance.

• The following checks shall be applied to installations using flammable refrigerants.

3.

- The charge size is in accordance with the room size within which the refrigerant containing parts are installed.

- The ventilation machinery and outlets are operating adequately and are not obstructed.

- If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant.

- Marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be corrected.

- Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance
which may corrode refrigerant containing components, unless the components are constructed of materials which are
inherently resistant to being corroded or are properly protected against being so corroded.

2-8. Checks to electrical devices

• Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures.

• Initial safety checks shall include but not limit to:-

- That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking.

- That there is no live electrical components and wiring are exposed while charging, recovering or purging the system.

- That there is continuity of earth bonding.

• At all times the manufacturer’s maintenance and service guidelines shall be followed.

• If in doubt consult the manufacturer’s technical department for assistance.

• If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt

with.

• If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be
used.

• The owner of the equipment must be informed or reported so all parties are advised thereinafter.

Repairs to sealed components

• During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to
any removal of sealed covers, etc.

• If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form of leak
detection shall be located at the most critical point to warn of a potentially hazardous situation.

• Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in
such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections, terminals
not made to original specification, damage to seals, incorrect fitting of glands, etc.

• Ensure that apparatus is mounted securely.

• Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of

flammable atmospheres.

• Replacement parts shall be in accordance with the manufacturer’s specifications.

NOTE:

The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment.
Intrinsically safe components do not have to be isolated prior to working on them.

Repair to intrinsically safe components

• Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible

4.

5.

6.

voltage and current permitted for the equipment in use.

• Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmosphere.

• The test apparatus shall be at the correct rating.

• Replace components only with parts specified by the manufacturer. Unspecified parts by manufacturer may result ignition of

refrigerant in the atmosphere from a leak.

Cabling

• Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse
environmental effects.

• The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.

Detection of flammable refrigerants

• Under no circumstances shall potential sources of ignition be used in the searching or detection of refrigerant leaks.

• A halide torch (or any other detector using a naked flame) shall not be used.

7

CAUTION

Leak detection methods

• Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may not be adequate, or may need re-
calibration.
(Detection equipment shall be calibrated in a refrigerant-free area.)

• Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.

• Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant

7.

8.

9.

10.

employed and the appropriate percentage of gas (25 % maximum) is confirmed.

• Leak detection fluids are suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as
the chlorine may react with the refrigerant and corrode the copper pipe-work.

• If a leak is suspected, all naked flames shall be removed/extinguished.

• If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by

means of shut off valves) in a part of the system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through
the system both before and during the brazing process.

Removal and evacuation

• When breaking into the refrigerant circuit to make repairs – or for any other purpose – conventional procedures shall be used.
However, it is important that best practice is followed since flammability is a consideration.
The following procedure shall be adhered to:

• remove refrigerant -> • purge the circuit with inert gas -> • evacuate -> • purge again with inert gas ->

• open the circuit by cutting or brazing

• The refrigerant charge shall be recovered into the correct recovery cylinders.

• The system shall be “flushed” with OFN to render the unit safe.

• This process may need to be repeated several times.

• Compressed air or oxygen shall not be used for this task.

• Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to fill until the working pressure is

achieved, then venting to atmosphere, and finally pulling down to a vacuum.

• This process shall be repeated until no refrigerant is within the system.

• When the final OFN charge is used, the system shall be vented down to atmospheric pressure to enable work to take place.

• This operation is absolutely vital if brazing operations on the pipe work are to take place.

• Ensure that the outlet for the vacuum pump is not close to any ignition sources and there is ventilation available.

Charging procedures

• In addition to conventional charging procedures, the following requirements shall be followed.

- Ensure that contamination of different refrigerants does not occur when using charging equipment.

- Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them.

- Cylinders shall be kept upright.

- Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.

- Label the system when charging is complete (if not already).

- Extreme care shall be taken not to over fill the refrigeration system.

• Prior to recharging the system it shall be pressure tested with OFN (refer to #7).

• The system shall be leak tested on completion of charging but prior to commissioning.

• A follow up leak test shall be carried out prior to leaving the site.

• Electrostatic charge may accumulate and create a hazardous condition when charging and discharging the refrigerant.

To avoid fire or explosion, dissipate static electricity during transfer by grounding and bonding containers and equipment before
charging/discharging.

Decommissioning

• Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details.

• It is recommended good practice that all refrigerants are recovered safely.

• Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of

reclaimed refrigerant.

• It is essential that electrical power is available before the task is commenced.

a)

Become familiar with the equipment and its operation.
Isolate system electrically.

b)

Before attempting the procedure ensure that:

c)

• mechanical handling equipment is available, if required, for handling refrigerant cylinders;

• all personal protective equipment is available and being used correctly;

• the recovery process is supervised at all times by a competent person;

• recovery equipment and cylinders conform to the appropriate standards.

Pump down refrigerant system, if possible.

d)

If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.

e)

Make sure that cylinder is situated on the scales before recovery takes place.

f)

Start the recovery machine and operate in accordance with manufacturer’s instructions.

g)

Do not over fill cylinders. (No more than 80 % volume liquid charge).

h)

Do not exceed the maximum working pressure of the cylinder, even temporarily.

i)

When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the

j)

equipment are removed from site promptly and all isolation valves on the equipment are closed off.

Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.

k)

• Electrostatic charge may accumulate and create a hazardous condition when charging or discharging the refrigerant.
To avoid fire or explosion, dissipate static electricity during transfer by grounding and bonding containers and equipment before
charging/discharging.

8

CAUTION

Labelling

• Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant.

11.

• The label shall be dated and signed.

• Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.

Recovery

• When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all
refrigerants are removed safely.

• When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed.

• Ensure that the correct number of cylinders for holding the total system charge are available.

• All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e. special cylinders for the

recovery of refrigerant).

• Cylinders shall be complete with pressure relief valve and associated shut-off valves in good working order.

• Recovery cylinders are evacuated and, if possible, cooled before recovery occurs.

• The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall

be suitable for the recovery of flammable refrigerants.

• In addition, a set of calibrated weighing scales shall be available and in good working order.

12.

• Hoses shall be complete with leak-free disconnect couplings and in good condition.

• Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that any

associated electrical components are sealed to prevent ignition in the event of a refrigerant release.
Consult manufacturer if in doubt.

• The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant Waste
Transfer Note arranged.

• Do not mix refrigerants in recovery units and especially not in cylinders.

• If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain

that flammable refrigerant does not remain within the lubricant.

• The evacuation process shall be carried out prior to returning the compressor to the suppliers.

• Only electric heating to the compressor body shall be employed to accelerate this process.

• When oil is drained from a system, it shall be carried out safely.

9

3. Specifications

Model

Performance Test Condition EUROVENT EUROVENT

Power Supply

Min. Mid. Max. Min. Mid. Max.

Capacity

Running Current A – 2.40 – – 3.90 –

Input Power W 170 510 880 170 840 1.04k

Annual Consumption kWh – 255 – – 420 –

EER

Cooling

ErP

Indoor Noise (H / L / QLo)

Outdoor Noise (H / L / QLo)

Heating

ErP

Indoor Noise (H / L / QLo)

Outdoor Noise (H / L / QLo)

Low Temp. : Capacity (kW) / I.Power (W) / COP 3.99 / 1.34k / 2.98 4.49 / 1.62k / 2.77

Extr Low Temp. : Capacity (kW) / I.Power (W) / COP 3.80 / 1.50k / 2.53 4.20 / 1.80k / 2.33

Max Current (A) / Max Input Power (W) 7.3 / 1.65k 8.1 / 1.83k

Pdesign kW 2.5 3.5

SEER (W/W) 8.1 7.8

Annual

Consumption

Class A++ A++

Power Factor % – 92 – – 94 –

Capacity

Running Current A – 3.40 – – 4.90 –

Input Power W 170 740 1.51k 170 1.06k 1.83k

COP

Pdesign kW 3.0 3.6

Tbivalent °C -10 -10

SCOP (W/W) 4.7 4.6

Annual

Consumption

Class A++ A++

Power Factor % – 95 – – 94 –

Starting Current (A) 3.40 4.90

Indoor CS-Z25UFEAW-1 CS-Z35UFEAW-1

Outdoor CU-Z25UFEA-1 CU-Z35UFEA-1

Phase, Hz Single, 50 Single, 50

V 230 230

kW 0.85 2.50 3.40 0.85 3.50 3.80

BTU/h 2900 8530 11600 2900 11900 13000

kcal/h 730 2150 2920 730 3010 3270

W/W 5.00 4.90 3.86 5.00 4.17 3.65

BTU/hW 17.06 16.73 13.18 17.06 14.17 12.50

kcal/hW 4.29 4.22 3.32 4.29 3.58 3.14

kWh 108 157

dB-A 38 / 25 / 20 39 / 26 / 20

Power Level dB 54 / – / – 55 / – / –

dB-A 46 / – / 43 48 / – / 45

Power Level dB 61 / – / – 63 / – / –

kW 0.85 3.40 5.50 0.85 4.30 6.20

BTU/h 2900 11600 18800 2900 14700 21100

kcal/h 730 2920 4730 730 3700 5330

W/W 5.00 4.59 3.64 5.00 4.06 3.39

BTU/hW 17.06 15.68 12.45 17.06 13.87 11.53

kcal/hW 4.29 3.95 3.13 4.29 3.49 2.91

kWh 894 1096

dB-A 38 / 25 / 19 39 / 26 / 19

Power Level dB 54 / – / – 55 / – / –

dB-A 48 / – / 45 50 / – / 47

Power Level dB 63 / – / – 65 / – / –

10

Model

Indoor CS-Z25UFEAW-1 CS-Z35UFEAW-1

Outdoor CU-Z25UFEA-1 CU-Z35UFEA-1

Type Hermetic Motor (Rotary) Hermetic Motor (Rotary)

Compressor

Motor Type Brushless (4 poles) Brushless (4 poles)

Output Power W 900 900

Type Cross Flow Fan Cross Flow Fan

Material ASG33 ASG33

Motor Type DC / Transistor (8-poles) DC / Transistor (8-poles)

Input Power W 44 44

Output Power W 30 30

Cool rpm 520 520

Heat rpm 550 550

Cool rpm 610 630

Lo

Heat rpm 620 640

Cool rpm 810 830

Heat rpm 840 860

Cool rpm 1010 1050

Hi

Heat rpm 1050 1070

Cool rpm 1060 1100

Heat rpm 1150 1170

Indoor Fan

Speed

QLo

Me

SHi

Type Propeller Fan Propeller Fan

Material PP PP

Motor Type DC (8-poles) DC (8-poles)

Input Power W – –

Output Power W 40 40

Outdoor Fan

Speed Hi

Cool rpm 800 820

Heat rpm 800 860

Moisture Removal L/h (Pt/h) 1.5 (3.2) 2.0 (4.2)

3

/min (ft3/min.) 5.0 (177) 5.0 (177)

3

/min (ft3/min.) 5.8 (205) 6.0 (212)

3

/min (ft3/min.) 7.7 (272) 7.9 (279)

3

/min (ft3/min.) 9.60 (340) 9.90 (350)

3

/min (ft3/min.) 10.0 (353) 10.4 (367)

3

/min (ft3/min.) 32.2 (1135) 32.7 (1155)

Indoor

Airflow

Outdoor

Airflow

QLo

Lo

Me

Hi

SHi

Hi

Cool m

Heat m3/min (ft3/min.) 5.3 (187) 5.3 (187)

Cool m

Heat m3/min (ft3/min.) 5.9 (208) 6.1 (215)

Cool m

Heat m3/min (ft3/min.) 8.0 (283) 8.2 (290)

Cool m

Heat m3/min (ft3/min.) 9.90 (350) 10.10 (355)

Cool m

Heat m3/min (ft3/min.) 10.9 (385) 11.1 (392)

Cool m

Heat m3/min (ft3/min.) 32.2 (1135) 34.4 (1215)

Control Device Expansion Valve Expansion Valve

Refrigeration

Cycle

Refrigerant Oil cm3 FW50S (450) FW50S (450)

Refrigerant Type g (oz) R32, 970 (34.2) R32, 1070 (37.8)

GWP 675 675

F-Gas

CO2eq (ton)

(Precharged Amount /

0.655 / 0.739 0.722 / 0.807

Maximum Charged Amount)

Height (I/D / O/D) mm (inch) 600 (23-5/8) / 622 (24-1/2) 600 (23-5/8) / 622 (24-1/2)

Dimension

Width (I/D / O/D) mm (inch) 750 (29-17/32) / 824 (32-15/32) 750 (29-17/32) / 824 (32-15/32)

Depth (I/D / O/D) mm (inch) 207 (8-5/32) / 299 (11-25/32) 207 (8-5/32) / 299 (11-25/32)

11

Model

Weight Net (I/D / O/D) kg (lb) 13 (29) / 34 (75) 13 (29) / 37 (82)

Pipe Diameter (Liquid / Gas) mm (inch) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 9.52 (3/8)

Standard length m (ft) 5.0 (16.4) 5.0 (16.4)

Length range (min – max) m (ft) 3 (9.8) ~ 20 (65.6) 3 (9.8) ~ 20 (65.6)

I/D & O/D Height different m (ft) 15.0 (49.2) 15.0 (49.2)

Piping

Additional Gas Amount g/m (oz/ft) 10 (0.1) 10 (0.1)

Length for Additional Gas m (ft) 7.5 (24.6) 7.5 (24.6)

Drain Hose

Indoor Heat

Exchanger

Outdoor

Heat

Exchanger

Air Filter

Power Supply Cord A Nil Nil

Indoor

Operation

Range

Outdoor

Operation

Range

1. Cooling capacities are based on indoor temperature of 27°C Dry Bulb (80.6°F Dry Bulb), 19.0°C Wet Bulb (66.2°F Wet Bulb) and outdoor air
temperature of 35°C DRY BULB (95°F Dry Bulb), 24°C Wet Bulb (75.2°F Wet Bulb).

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

3. Heating low temperature capacity, Input Power and COP measured at 230 V, indoor temperature 20°C, outdoor 2/1°C.

4. Heating extreme low temperature capacity, Input Power and COP measured at 230 V, indoor temperature 20°C, outdoor -7/-8°C.

5. Specifications are subjected to change without prior notice for further improvement.

Inner Diameter mm 28.5 28.5

Length mm 270 270

Fin Material Aluminium (Pre Coat) Aluminium (Pre Coat)

Fin Type Slit Fin Slit Fin

Row × Stage × FPI 2 × 17 × 21 2 × 17 × 21

Size (W × H × L) mm 554 × 357 × 25.4 554 × 357 × 25.4

Fin Material Aluminium Aluminium

Fin Type Corrugated Fin Corrugated Fin

Row × Stage × FPI 2 × 28 × 17 2 × 28 × 17

Size (W × H × L) mm 36.4 × 588 × 781.3:752.7 36.4 × 588 × 856.3:827.7

Material Polypropelene Polypropelene

Type One-touch One-touch

Power Supply Outdoor Outdoor

Thermostat Electronic Control Electronic Control

Protection Device Electronic Control Electronic Control

Dry Bulb Wet Bulb Dry Bulb Wet Bulb

Cooling

Heating

+8/15°C Heat

Cooling

Heating

+8/15°C Heat

Indoor CS-Z25UFEAW-1 CS-Z35UFEAW-1

Outdoor CU-Z25UFEA-1 CU-Z35UFEA-1

Maximum °C (°F) 32 (89.6) 23 (73.4) 32 (89.6) 23 (73.4)

Minimum °C (°F) 16 (60.8) 11 (51.8) 16 (60.8) 11 (51.8)

Maximum °C (°F) 30 (86.0) – (–) 30 (86.0) – (–)

Minimum °C (°F) 16 (60.8) – (–) 16 (60.8) – (–)

Maximum °C (°F) 15 (59.0) – (–) 15 (59.0) – (–)

Minimum °C (°F) 8 (46.4) – (–) 8 (46.4) – (–)

Maximum °C (°F) 43 (109.4) 26 (78.8) 43 (109.4) 26 (78.8)

Minimum °C (°F) -15 (5.0) – (–) -15 (5.0) – (–)

Maximum °C (°F) 24 (75.2) 18 (64.4) 24 (75.2) 18 (64.4)

Minimum °C (°F) -25 (-13.0) – (–) -25 (-13.0) – (–)

Maximum °C (°F) – (–) – (–) – (–) – (–)

Minimum °C (°F) -25 (-13.0) – (–) -25 (-13.0) – (–)

12

4. Features

• Inverter Technology

o Wider output power range
o Energy saving
o More precise temperature control

• Environment Protection

o Non-ozone depletion substances refrigerant (R32)

• Long Installation Piping

o Long piping up to 20 meters

• Easy to use remote control

• Quality Improvement

o Random auto restart after power failure for safety restart operation
o Gas leakage protection
o Prevent compressor reverse cycle
o Inner protector to protect compressor

• Operation Improvement

o Quiet mode to reduce the indoor unit operating sound
o Powerful mode to reach the desired room temperature quickly
o 24-hour timer setting
o +8/15°C HEAT operation is designed to provide heating at low temperature settings. It is used in houses

unoccupied during winter, for the purpose of protecting equipment or housing appliances which may be
destroyed by extreme cold weather

• Serviceability Feature

o Breakdown Self Diagnosis function
o Activation and Deactivation Method for Heating Only Mode

13

5. Location of Controls and Components

.

t

5.1 Indoor Unit

INDICATOR

Air Outlet

Airflow Direction Louver

Aluminium Fin

Receiver Remote Control

Front Panel

Auto OFF/ON button

• Use when remote control is
misplaced or a malfunction occurs

Air Inlet

5.2 Outdoor Unit

5.3 Remote Control

nanoe™ X operation

+8/15°C Heat operation

Air filters

LCD display

Quiet operation

Operation mode

String

OFF/ON

Temperature setting

Airflow direction adjustmen

Powerful operation
Fan speed selection

Time r setting

Clock setting

14

6. Dimensions

6.1 Indoor Unit

<Top View>

<Side View><Side View> <Front View>

750 207

600

<Back View>

<Bottom View>

106.5

60

49.7

<Remote Control>

165

<Remote Control Holder>

69

45

59

64

71.6

75

80.5

80.4

101.3

65.4

Unit : mm

15

6.2 Outdoor Unit

>

Space necessary for

installat ion

100 mm

100 m m

1000 mm

Anchor Bolt Pitch

330 × 540

<Top View

22 (124 ) (53.4)

824 68.5

540 160

<Front View><Side View>

32

97

167

330

<Side View>

46 299

622

Unit : mm

3-way valve at Gas side
(Low Pressure)

2-way valve at Liquid side
(High Pressure)

61

69

(23)

16

7. Refrigeration Cycle Diagram

INDOOR OUTDOOR

INTAKE

AIR

TEMP.

SENSOR

HEAT EXCHANGER

(EVAPORATOR)

PIPE

TEMP.

SENSOR 2

PIPE

TEMP.

SENSOR 1

LIQUID

SIDE

2-WAY
VALV E

GAS

SIDE

EXPANSION

VALV E

RECEIVER

AIR

STRAINERMUFFLER

TEMP.

SENSOR

CONDENSER

PIPE

TEMP.

SENSOR

3-WAY
VALV E

COOLING
HEATING

4-WAYS VALVE

MUFFLER

TAN K

SENSOR

COMPRESSOR

17

8. Block Diagram

3 ~

MS

COMPRESSOR

Q1

3 ~

MS

FAN MO TOR

IC19

FUSE3

FUSE6

REAC TOR

FUSE8

SEN1

TH1

NTC

FUSE5

4-WAY

VALV E

RY-PWR

RY-AC

PTC

PTC2

NOISE FILTER

FUSE1

(OUTDOOR UNIT)(INDOOR UNIT)

L

N

M

POWER SUPP LY

SINGLE PHASE

FUSE 301

SC

1

2

3

TEMP.

FUSE

18

A301

9. Wiring Connection Diagram

9.1 Indoor Unit

TO OUTDOOR UNIT

Y/G

EVAPORATOR

TERMINAL
BOARD

1

2

3

W

TEMP. FUSE
102°C (250V 3A)

GROUNDING

TERMINAL

FAN MOTOR

M

BL

R

G

AC306 (BLK)

AC303 (WHT)

AC304 (RED)

G301 (GRN)

1

R

BL

4

W

B
Y

7

1

CN–FM

(WHT)

ELECTRONIC CONTROLLER

5

CN-CNT

(WHT)

COMMUNICATION

CN–RCV

(YLW)

113

WWW

FUSE301

T3.15A L250V

CIRCUIT

(MAIN)

NOISE
FILTER

CIRCUIT

RECTIFICATION

CIRCUIT

1

WW WWW WWW

1

CN–RMT

(WHT)

CN–STM1

(BLU)

CN–STM2

(WHT)

CN–NANO

CN–DISP

(YLW)

4

CN–TH

(RED)

(BLU)

REMARKS

B : BLUE
P : PINK
BR : BROWN
O : ORANGE
BL : BLACK
G/GRN : GREEN
Y/YLW : YELLOW
W/WHT : WHITE
R : RED

CN2

1

2

Y/G : YELLOW/GREEN
GR : GRAY

W
BL

NANOE ION

GENERATOR

W

BR

1

R
O
Y
P

5

BR

1

R
O
Y
P

5

6

t°

t°

t°

1

GR + R

1

GR
GR
GR

4

9

UP DOWN

1

M

LOUVER MOTOR
(TOP)

5

1

UP DOWN

M

LOUVER MOTOR
(FRONT)

5

PIPING TEMPERATURE SENSOR 2 (THERMISTOR)
PIPING TEMPERATURE SENSOR 1 (THERMISTOR)

SUCTION TEMPERATURE SENSOR (THERMISTOR)

5

CN1

(WHT)
1

(WHT)

HIGH VOLTAGE

POWER SUPPLY

REMOTE CONTROLLER

CN-RCV

(WHT)

3

ELECTRONIC

CONTROLLER

(RECEIVER)

1

(SW01)

CN-DISP

(WHT)

8

ELECTRONIC CONTROLLER

(DISPLAY)

19

9.2 Outdoor Unit

W

SINGLE PHASE POWER SUPPLY

TO INDOOR UNIT

YELLOW

(YLW) OR (C)

1NL23

MS
3~

GRN

GRN

RED

DATA
(RED)

WHT

AC-BLK
(BLK)

FUSE 1

(20A 250V)

AC-WHT
(WHT)

FG1
(GRN)

FG2
(GRN)

1

HT2 (BLU)BLU

ACN2 (BLU)

BLU

3

CN-MTR2

(WHT)

1

W

3

U
V

5

1

CN-MTR1

(RED)

3

BLK

GROUNDING TERMI NAL

YLW/GRN

BASE PAN

HEATER

FAN

MOTOR

WHT

BLK

Resistance of Compressor Windings

MODEL CU-Z25UFEA-1 / CU-Z35UFEA-1

CONNECTION 9RD132XAB21 (Ω)

U-V 1.897

U-W 1.907

V-W 1.882

Note: Resistance at 20°C of ambient temperature.

TERMINAL
BOARD

NOISE FILTER

CIRCUIT

FUSE 8
T3.15A

L250V

PFC

CIRCUIT

10

14

16

IC19

ELECTRONIC CONTROLLER

GRY

RAT2

(GRY)

REACTOR

FUSE 5

(20A 250V)

FUSE 6
(20A 250V)

RECTIFICATION

CIRCUIT

FUSE 3
T3.15A L250V

GRY

RAT1
(GRY)

COMMUNICATION

CIRCUIT

RECTIFICATION

CIRCUIT

SWITCHING

POWER

SUPPLY CIRCUIT

Q1

P

N

U

V

W

CN–TH1

(WHT)

CN–TANK

(WHT)

CN–STM1

(WHT)

CN–HOT

(WHT)

U (RED)

V (BLU)

W (YLW)

BLUE

(BLU)

OR (R)

TRADEMARK

COMPRESSOR TERMINAL

THE PARENTHESIZED

LETTERS IS INDICATED

ON TERMINAL COVER

OUTDOOR AIR TEMP. SENSOR (THERMISTOR)

1

t°

t°

4

PIPING TEMP. SENSOR (THE RMISTOR)

1

t°

3

COMPRESSOR TEMP. SENSO R (THERMISTOR)

1

M

6

YLW

1

3

YLW

RED

BLU

YLW

RED
(RED)
OR (S)

ELECTRO-MAGNETIC COIL
(EXPANSION VALVE)

ELECTRO-MAGNETIC COIL
(4 -WAY VA LVE )

MS

3~

COMPRESSOR

REMARKS
BLU : BLUE
BLK : BLACK
WHT : WHITE
RED : RED
YLW : YELLO
GRY : GRAY
GRN : GREEN

20

10. Electronic Circuit Diagram

10.1 Indoor Unit

1

FUSE301

T3.15A L250V

Q13

B

5

RECTIFICATION

BZ301

C

E

5V

*L5

*C57

NOISE
FILTER

CIRCUIT

CIRCUIT

R30

1k

CN–DISP

(YLW)

CN-DISP

(WHT)

5V

REMOTE CONTROLLER

TO OUTDOOR UNIT

Y/G

EVAPORATOR

70

60

50

40

30

Resistance (k )

20

10

0

TERMINAL
BOARD

1

2

3

TEMP. FUSE
102°C (250V 3A)

GROUNDING

TERMINAL

FAN MOTOR

IC201

GND
VCC

@cirPi

4

VOUT

@cirPi

5

+

C201

47µ

Sensor (Thermistor)

Charac teristics

1

2

2

-10 0 10

BL

R

W

G

R

BL

M

W

B
Y

5V

R203

47

3

2
1

*LED201

C202

0.01µ

G1

Pipe temp. Sensor

Intake Air Temp. Sensor

1

20 30 40 50

o

Temperature (

C)

AC306 (BLK)

AC303 (WHT)

AC304 (RED)

G301 (GRN)

CN–FM

(WHT)

1

4

7

CN–RCV

(YLW)

CN-RCV

(WHT)

*R201

CN-CNT

(WHT)

COMMUNICATION

R121

10k

113

WWW

3

ELECTRONIC

CONTROLLER

CIRCUIT

(RECEIV ER)

13V

*F302

R82

*L6

10k

JR4

C51

*C56

1000p

50V

ELECTRONIC CONTROLLER

JR5

0

*JP10

1

WW WWW WWW

1

*JP11

9

8

B

B

5V

R90
10k

C52

1000p

50V

IC05

710

B

Q204

E

C

C

E

G1

CN–RMT

(WHT)

(MAIN)

15.0k

R42

1k

*R96*R95

B

Q205

Q203

4

1

5V

R54
270

C25

R62

1%

R61

1µ

20.0k

16V

1%

13V

C651µR108

R109

33k

33k

5V

B

R107

R113

10k

1k

C68

C67

1000p

1000p

G7

5V

13V

C4

0.01µ

C3

*C70

0.1µ

5V

E

Q201

B

E

C

*R201

JR1*R204

C

E

Q202

*R202

C

*R205

*R203 JR3

*LED203

ELECTRONIC CONTROLLER

(DISPLAY)

R37
10k

C45

0.1µ

C27

16V

Q18

SD

G

Q21

C

4.7K

10K

E

C69

1000p

R43
10K

*LED201

*LED202

5V

R85

5.1k

C48

C47

C49

IC02

13V

9

1

16

CN–STM1

2

15

3

4

5

6

7

IC03

1

2

3

4

5

6

7

R63

1µ

20.0k
1%

F303

5V

R89

*JR2

(BLU)

14

13

12

11

10

9

16

15

14

13

12

11

10

C

E

G7

*R40

A

B

G1

13V

4.7K

G7

Q20

10K

SW01

13V

5V

C28

16V

R39

5.1k

*C14
2200p

1µ

CN–STM2

(WHT)

CN–TH
(RED)

CN–NANO

(BLU)

B

*C15

1000p

1

BR

R
O
Y
P

5

1

BR

R
O
Y
P

5

6

1

GR + R

1

GR
GR
GR

4

UP DOWN

1

M

LOUVER MOTOR
(TOP)

5

1

UP DOWN

M

LOUVER MOTOR
(FRONT)

5

t°

PIPING TEMPERATURE SENSOR 2 (THERMISTOR)

t°

PIPING TEMPERATURE SENSOR 1 (THERMISTOR)

t°

SUCTION TEMPERATURE SENSOR (THERMISTOR)

5

CN1
(WHT)
1

1

W

CN2

BL

(WHT)

2

HIGH VOLTAGE

W

POWER SUPPLY

NANOE ION

GENERATOR

21

10.2 Outdoor Unit

SINGLE PHASE POWER SUPPLY

TO INDOOR UNIT

GRY

REACTOR

FUSE 5

(20A 250V)

FUSE 6
(20A 250V)

RECTIFICATION

CIRCUIT

FUSE 3
T3.15A L250V

GRY

RAT1
(GRY)

COMMUNICATION

CIRCUIT

RECTIFICATION

CIRCUIT

SWITCHING

POWER

SUPPLY CIRCUIT

Q1

P

N

Compressor Temp. Sensor

(Thermistor) Characteristics

70

60

50

40

30

Resistance (kΩ)

20

10

0

20 40 60

Temperature (

R21

15.8k
1%

C9
1u

10V

B1

G5

G5

C99

R28

1u

4.99k

10V

1%

B1

G5

C921

U

V

W

80 100 120 140

o

C)

5V

R22

C98

15k
1%

470u

10V

C10

KY

1u

10V

CN–TH1

B1

(WHT)

G5

5V

IC8

15

4

16

3

17

2

18

1

15V

10

COMMON

0.1u

IC8

GND

50V

9

B3

G4A

D57

NONE

AK

G4A

OUTDOOR AIRTEMP. SENSOR (THERMISTOR)

1

t°

t°

4

PIPING TEMP. SENSOR (THERMISTOR)

CN–TANK

(WHT)

1

t°

3

COMPRESSORTEMP. SENSOR (THERMISTOR)

CN–STM1

(WHT)

1

ELECTRO-MAGNETIC COIL

M

(EXPANSION VALVE)

6

CN–HOT

(WHT)

1

YLW

ELECTRO-MAGNETIC COIL
(4-WAY VALVE)

YLW

3

D59

AK

U (RED)

RED

V (BLU)

BLU

W (YLW)

YLW

COMPRESSOR

MS

3~

1NL23

MS
3~

GRN

GRN

RED

DATA
(RED)

WHT

AC-BLK
(BLK)

FUSE 1

(20A 250V)

AC-WHT
(WHT)

FG1
(GRN)

FG2
(GRN)

1

HT2 (BLU)BLU

ACN2 (BLU)

BLU

3

CN-MTR2

(WHT)
1

3

5

CN-MTR1

(RED)
1

3

BLK

GROUNDING TERMINAL

YLW/GRN

BASE PAN

HEATER

FAN

MOTOR

WHT

BLK

TERMINAL
BOARD

RAT2

(GRY)

NOISE FILTER

CIRCUIT

FUSE 8
T3.15A

L250V

PFC

CIRCUIT

IC19

70

60

50

40

30

Resistance (kΩ)

20

10

0

10

14

16

Sensor (Thermistor)

Characteristics

Outdoor Air Sensor
Outdoor Heat Exchanger
Sensor

-10010

Temperature (

ELECTRONIC CONTROLLER

20 30 40 50

o

C)

W

U
V

5V

C401

0.1u
25V

B1

G5

22

11. Printed Circuit Board

11.1 Indoor Unit

11.1.1 Main Printed Circuit Board

AC306

G301
CN-FM

AC304

AC303

JP1

(Random Auto Restart

enable/disable)

CN-DISP

CN-RCV

CN-NANO

CN-RMT

CN-STM1

CN-CNT

CN-STM2

CN-TH

23

11.1.2 Display Printed Circuit Board

11.1.3 Receiver Printed Circuit Board

CN-DISP

LED201

CN-RCV

24

11.2 Outdoor Unit

11.2.1 Main Printed Circuit Board

POWER

TRANSISTOR

(IPM)

CURRENT

TRANSFORMER

(CT)

DATA

AC-WHT

AC-BLK

CN-MTR2

CN-MTR1

CN-STM1

CN-TH1

CN-HOT
CN-TANK

25

12. Installation Instruction

12.1 Indoor Unit

Required Materials

• Read catalog and other technical materials and prepare the required materials.

• Pipe Size Reducer (CZ-MA1P) for CS-Z50*** when connect to multi.

Other Items to be Prepared (Locally Purchased)

Product name Remarks

Rigid PVC pipe

Adhesive PVC adhesive

Insulation For drain piping insulation (formed polyethylene with a thickness of 10mm or more)

Indoor/outdoor connecting cable 4 × 1.5mm2 flexible cord : type designation 245 IEC57 (H05RN-F)

Table A

Model Capacity Indoor A

Z25*** 1.0HP 10.29

Z35*** 1.5HP 12.25

* Table “A” only applicable for single split connection.

A

= (M / (2.5 x (LFL)

min

A

= Required minimum room area, in m2

min

(5/4)

M = Refrigerant charge amount in appliance, in kg
LFL = Lower flammable limit (0.306 kg/m
h

= Installation height of the appliance (0.6m for floor console)

0

VP20 (outer diameter ø26mm), VP30 (outer diameter ø38mm), Reducer (VP30-VP20) ; also socket, elbow
and other parts as necessary.

(m2)

min

x h0))2

3

)

12.1.1 Selecting the Installation Location

12.1.1.1 Indoor Unit

Before choosing the installation site, obtain user approval.

• 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.

• Locate the indoor unit at least 1m or more from TV, radio, wireless equipment, antenna cables and fluorescent

light, and 2m or more away from a telephone.

• Ensure the spaces indicated by arrows from the wall, ceiling, fence or other obstacles.

Installation Diagram

• The indoor unit may be mounted in any of the three styles shown here.

Expose d

Mounting

plate 1

Molding

Floor Installation Wall Install ation

Half concealed Concealed

Front grille

Air filter

Front panel

50mm or more

from walls

70mm or more

50mm or more

from walls

Caulk pipe

hole gap

with putty.

26

12.1.1.2 Remote Controller

r

N

• Signals may not be transmitted and received
correctly when the remote controller is operated
while in the holder. Take the remote controller in
your hand to operate the unit.

• Mount the holder in a location that is not subject to
the effects of heat (direct sunlight and stoves,
etc.).

Attaching the remote control holder to the wall

Remote control holder fixing screws

Remote
control

4

Remote control holder

12.1.2 Selection of Pipe and Heat Insulation Materials

• When using commercial copper pipes and fittings, observe the following:
1 Insulation material: Polyethylene foam

Heat transfer rate: 0.041 to 0.052 W/mk (0.035 to 0.045kal/mh°C)
Refrigerant gas pipe’s surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.

2 Be sure to insulate both the gas and liquid piping and to provide insulation dimension as below.

Pipe Dimension Heat Insulation Dimension

Gas side 3/8”(O.D. 9.5mm t0.8mm) I.D.12-15mm t10mm Min

Liquid side 1/4”(O.D. 6.4mm t0.8mm) I.D. 8-10mm t10mm Min

3 Use separate heat insulation pipes for gas and liquid refrigerant pipes.

• Required material
o Pipe size reducer (CZ-MA1P) for CS-Z50*** when connect to multi.

7

6

12.1.3 Installing the Indoor Unit

12.1.3.1 Exposed Installation

12.1.3.1.1 Refrigerant piping

1 Drill a hole (70mm in diameter) in the spot indicated by the symbol in the illustration as below.
2 The location of the hole is different depending on which side of the pipe is taken out.
3 For piping, see 12.1.4. Connecting the refrigerant piping.
4 Allow space around the pipe for a easier indoor unit pipe connection.

(Unit : mm)

all

W

Left back piping

45

80

80

45

60

70

Left/right side piping

70

Right back piping

45

gnipipmottobthgiRgnipipmottobtfeL

Refrigerant pipe/

35

70

45

CAUTIO

Min. allowable length

• The suggested shortest pipe length is 3.0m, in order to avoid noise from the outdoor unit and vibration.
(Mechanical noise and vibration may occur depending on how the unit is installed and the environment in which it is used.)

• See the installation manual for the outdoor unit for the maximum pipe length.

• For multi-connections, see the installation manual for the multi-outdoor unit.

Wall

350

45

Floo

27

12.1.3.1.2 To drill a hole in the wall and install a sleeve of piping

N

T

O

pena

1 Insert the piping sleeve to the hole.
2 Fix the bushing to the sleeve.
3 Cut the sleeve until it extrudes about 15 mm

from the wall.

CAUTION

When the wall is hollow, please be sure to use the sleeve for tube
ass’y to prevent dangers caused by mice biting the connecting cable.

4 Finish by sealing the sleeve with putty or

caulking compound at the final stage.

Indoor Outdoor

Sleeve
(Locally
purchased)

ø70 through hole

15 mm

Approx. 5 - 7 mm

Bushing
(Locally purchased)

Putty or caulking compound

12.1.3.1.3 Drain piping

1 Use commercial rigid polyvinyl chloride pipe (general VP 20 pipe, outer diameter 26mm, inner diameter

20mm) for the drain pipe.

2 The drain hose (outer diameter 18mm at connecting end, 270mm long) is supplied with the indoor unit.

Prepare the drain pipe picture below position.

3 The drain pipe should be inclined downward so that water will flow smoothly without any accumulation.

(Should not be trap.)
4 Insert the drain hose to this depth so it won’t be pulled out of the drain pipe.
5 Insulate the indoor drain pipe with 10mm or more of insulation material to prevent condensation.
6 Remove the air filters and pour some water into the drain pan to check the water flows smoothly.

105

In case back piping

Refrigerant pipe

130

100

Drain hose

Vinyl chlo ride

drain pipe
(VP-20)

3

Reduce r

270

50mm
or more

Vinyl chloride

drain pipe

(VP-30)

CAUTIO

Use polyvinyl chloride adhesive agent for gluing. Failure to do so may cause water leakage.

12.1.3.1.4 Indoor unit preparation

• Push in the tab on both sides of front panel to
open front panel.

• Unhook the string, lift up the front panel to remove
it.

• Slide Shaft to disassemble top vane

• Remove 2 screws and disengage center hook

then dismount front grille.

• For Moldings and Side Piping

• Remove the pillars. (Remove the slit portions on

the bottom frame using nippers.)

For Side Piping without MoldingsFor Moldings For Side Piping with Moldings

Drain hose
at below

(Unit: mm)

Insert drain hose
to this depth so it
won’t be pulled
out of drain pipe.

4 Remove 2 screws

1 Push in

tab to unhook

front panel

Front panel

2

Must be no trap.

Do not touch water.

5 Disengage center hook

nd remove front panel

op vane

Shaft

3 Slide left to

disassemble

top vane

6 Remove

front grille

Front grille

Bottom frame

Cut

Remove the
pillars (Cut off)

Bottom frame

Cut

Remove the
pillars (Cut off)

Bottom frame

Cut

Remove the
pillars (Cut off)

28

12.1.3.1.5 Indoor unit installation

N

• For floor installations, secure the indoor unit using 6 screws.

• For wall installations, secure the mounting plate using 7 screws and the indoor unit using 4 screws.

o Temporarily secure the mounting plate to the wall, make sure that the panel is completely level, and mark the

drilling points on the wall.

• Once refrigerant piping and drain piping connections are complete, fill in the gap of the through hole with putty. A
gap can lead to condensation on the refrigerant pipe, and drain pipe, and the entry of insects into the pipes.

• Attach the front panel and front grille by following the removal procedure in reverse once all connections are
complete.

Floor Installation Wall Installation

Mounting

To access these 2 locations,
long screw driver is required.

6screws2

(M4 × 25L)

Casing

To access these 2 locations,
long screw driver is required.

4screws2
(M4 × 25L)

CAUTION

The mounting plate should be installed on a wall
which can support the weight of the indoor unit.

plate 1

7screws2
(M4 × 25L)

Molding

• Location for securing the mounting plate.

(

7

3

2

5

0

5
3
1

5
6
2

7

0

2

6

0

5

0

3

)

7

2

0

(Unit: mm)

1

2

8

6

0

0
2

)

0

0

0

8

0

9

5

6

(

0
3
2

2

6

1

12.1.3.2 Half concealed installation

• Only item peculiar to this installation method are given here. See Exposed installation for additional instructions.

12.1.3.2.1 Wall hole

• Drill a wall hole of the size shown in the illustration
on the right.

742-746

Open size

Opening hole

Floor

(Unit: mm)

592-598

12.1.3.2.2 Installation of supplemental plate for attaching indoor unit

• The rear of the unit can be fixed with screws at the points shown in the illustration as below. Be sure to install the
supplemental plate in accordance with the depth of the inner wall.

Screw hole

Fixing point
on the back

135

265

Supplemental plate
(Locally purchased)

Opening hole

720

Screw hole

90

230

50

Supplemental plate
(Locally purchased)

250

200

(Unit: mm)

CAUTIO

• The supplemental plate for installing the main unit must be used, or there will be a gap between the unit and the wall.

29

12.1.3.2.3 Refrigerant piping

See Refrigerant piping under Exposed Installation.

Hole location

Left bottom piping Right bottom piping

5

10

80

70

Wall

Unit piping position

Right/left side piping

Wall

(Unit: mm)

45

50

12.1.3.3 Concealed installation

• Only item peculiar to this installation method are given here. See Exposed installation for additional instructions.

12.1.3.3.1 Preparation

• Install the unit according to the instructions below. Failure to do so may cause lead to both cooling and heating
failure and the condensation inside the house.
1 Allow enough space between the main unit and ceiling not to obstruct the flow of cool/warm air.
2 Use remote controller to change the upward air flow limit restriction. When the unit in standby mode, follow

the steps below:

o Press continuously for more than 5 seconds to enter special setting mode.

o Press to choose function 69, and then press or to set “01”
o Press to activate “Up/down air swing upper limit restriction”

SET

T 5secs

(Function

no.)

(Options)

Special setting mode

Activate or deactivate
“Air swing upper limit
restriction”

CAUTION

If there is an obstruction to upward air flow, it is recommanded to turn on upward air flow limit restriction. Failure to
do so may cause incomplete cooling/heating and formation of condensation inside the house.

50 or more 50 or more

12.1.3.3.2 Refrigerant piping

Left bottom piping Right bottom piping

Hole location

45

80

70 or more

(Unit: mm)

60

70

Right/left side piping

35

45

30

12.1.4 Connecting the Refrigerant Piping

h

12.1.4.1 Connecting The Piping to Indoor

For connection joint of all models
Please make flare after inserting flare nut (locate at
joint portion of tube assembly) onto the copper pipe.
(In case of using long piping)

Connect the piping

• Align the center of piping and sufficiently tighten
the flare nut with fingers.

• Further tighten the flare nut with torque wrench in
specified torque as stated in the table.

Seal sufficiently the flare nut (both gas and liquid
sides) with neutral cure (Alkoxy type) & ammonia-free
silicone sealant and insulation material to avoid the
gas leak caused by freezing.

Apply neutral cure

(Alkoxy type) and

ammonia-free silicone

sealant along the

circumference

Spanner or Wrench

Torque wrenc

Additional Precautions For R32 Models when
connecting by flaring at indoor side

Ensure to do the re-flaring of pipes before
connecting to units to avoid leaking.

12.1.4.2 Connecting The Piping to Outdoor

Decide piping length and then cut by using pipe cutter.
Remove burrs from cut edge.
Make flare after inserting the flare nut (locate at valve)
onto the copper pipe. Align center of piping to valve
and then tighten with torque wrench to the specified
torque as stated in the table.

12.1.4.3 Insulating the refrigerant piping

• Attach the pipe after checking for gas leakage,
described above.
1 Cut the insulated portion of the on-site piping,

matching it up with the connecting portion.

2 Secure the slit on the auxiliary pipe side with

the butt joint on the connection pipe using the
tape, making sure there are no gaps.

3 Wrap the slit and the butt joint with the

included insulation sheet, making sure there
are no gaps.

12.1.4.4 Checking for gas leakage

• Check for leakage of gas after air purging.

• See the in the installation manual for the outdoor.

CAUTION

1) Insulate the joint of the pipes securely.
Incomplete insulation may lead to water leakage.

2) Push the pipe inside so it does not apply undue force on the front grille.

Neutral cure (Alkoxy type) & ammonia-free silicone
sealant is only to be applied after pressure testing and
cleaning up by following instructions of sealant, only to
the outside of the connection. The aim is to prevent
moisture from entering the connection joint and
possible occurrence of freezing. Curing sealant will
take some time. Make sure sealant will not peel off
when wrapping the insulation.

Do not overtighten, overtightening may cause gas leakage.

Piping size Torque

6.35 mm (1/4") [18 N•m (1.8 kgf•cm)]

9.52 mm (3/8") [42 N•m (4.3 kgf•cm)]

12.7 mm (1/2") [55 N•m (5.6 kgf•cm)]

15.88 mm (5/8") [65 N•m (6.6 kgf•cm)]

19.05 mm (3/4") [100 N•m (10.2 kgf•cm)]

Slit

2) )3)1

Auxiliary pipe Auxiliary pipe Auxiliary pipe

Slit

Insulation sheet

T

ape

Connection
pipe

Check for le akagehere.

• Apply soapy water and
check carefully for leaking
gas.

• Wipe soapy water off after
the check is complete.

3

31

12.1.5 Connecting the Indoor/Outdoor
Connection Cable

• Guide connection cable pass through refrigerant

piping port and lead the connection cable into the
control box.

• Check the color of the wires on the terminal board

and secure them with screws.

• Secure the connection cable with cord holder.

• Guide and push the connection cable inside so

that it does not apply undue force on the front
grille.

• Fix the connection cable into cable holder.

WARNING

This equipment must be properly earthed.

When the wall is hollow, please be sure to use the sleeve for
tube ass’y to prevent dangers caused by mice biting the
connection cable.

• Connection cable between indoor unit and

outdoor unit should be approved polychloroprene
sheathed 4 x 1.5 mm
type 60245 IEC 57 (H05RN-F) or heavier cord.
Allowable connection cable length of each indoor
unit shall be 30 m or less.
o Ensure that the terminal numbers on the

indoor unit are connected to the same
terminal numbers on the outdoor unit by the
right coloured wires as shown in the diagram.

WIRE STRIPPING,
CONNECTING
REQUIREMENT

No loose strand
when inserted

CAUTION

2

flexible cord, designation

Wire stripping

10 ± 1 mm

Indoor/outdoor
connection
terminal board

5 mm or more

(gap between wires)

o Earth lead wire should be longer than the

other lead wires as shown in the diagram for
electrical safety purpose in case the cord slips
out from the anchorage.

• Secure the cable onto the control board with the
holder (clamper).

Terminals on the indoor unit 1 2 3
Colour of wires

Terminals on the outdoor unit

123

• Ensure the colour of wires of outdoor unit and the
terminal Nos. are the same to the indoor’s
respectively.

• Earth wire shall be Yellow/Green (Y/G) in colour
and longer than other AC wires for safety reason.

Terminal Board

Cable holder

Connection cable

Refrigerant piping port

④

⑤

②

①

③

Cord

Connection cable

holder

Earth Wire
longer than
othe rs AC wire s
for safety reason

Conductor

fully inserted

ACCEPT

Conductor

over inser ted

PROHIBITED PROHIBITED

Conductor not

fully inserted

RISK OF FIRE

JOINING OF

WARNING

Do not joint wires

WIRES MAY CAUSE
OVERHEATING AND
FIRE.

OR

OR

Use complete wire without joining.
Use approved socket and plug with earth pin.

Wire connection in this area must follow to
national wiring rules.

OR

32

12.2 Outdoor Unit

D

S

12.2.1 Select the Best Location

• 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 the [piping length for
additional gas], additional refrigerant should be
added as shown in the table.

Model

Z25****

Z35****

Horse
Power

(HP)

1.0HP

1.5HP

Piping size

Gas Liquid

9.52mm
(3/8")

6.35mm
(1/4")

Max.

Std.

Elevation

Length

a

b

(m)

(m)

15 3 20 10 7.5 10.29

5

15 3 20 10 7.5 12.25

Min.

Piping

Length

(m)

Max.

Piping

Length

(m)

Additional

Refrigerant

(g/m)

Length for

Example: For Z25****
If the unit is installed at 10 m distance, the quantity of

additional refrigerant should be 25 g .... (10-7.5) m x

10 g/m = 25 g.

= (M / (2.5 x (LFL)

A

min

A

= Required minimum room area, in m2

min

(5/4)

x h0)) 2

M = Refrigerant charge amount in appliance, in kg
LFL = Lower flammable limit (0.306 kg/m
h

= Installation height of the appliance : (0.6m for

0

3

)

floor console)

Piping

add. gas

(m)

Indoor

A

(m²)

min

0.6m for

floor console

12.2.1.1 Outdoor Installation Diagram

Power supply
cable (

)

Connection
cable (

)

1/4" Liquid side

)

m

m

e

0

r

0

o

1

m

r

o

1

0

0

m

m

o

r

m

o

r

e

m

m

0

0

e

0

r

1

It is advisable to avoid more
than 2 blockage directi ons.
For better vent ilation &
multiple-outdoor ins tallation,
please consult author ized
dealer/specialist .

This illustrat ion is for explanation purposes only.

•

o

m

r

o

piping (

Gas side
piping (

)

Additional drain

)

hose (

3

0

0

m

o

m

r

m

o

r

e

Installation parts you
should purchase (

)

12.2.2 Install the Outdoor Unit

• After selecting the best location, start installation
according to Indoor/Outdoor Unit Installation
Diagram.
1 Fix the unit on concrete or rigid frame firmly

and horizontally by bolt nut (ø10 mm).

2 When installing at roof, please consider strong

wind and earthquake.
Please fasten the installation stand firmly with
bolt or nails.

12.2.3 Connect the Piping

12.2.3.1 Connecting the Piping to Indoor

For connection joint location at outside building
Please make flare after inserting flare nut (locate at
joint portion of tube assembly) onto the copper pipe.
(In case of using long piping)
Connect the piping

• Align the center of piping and sufficiently tighten
the flare nut with fingers.

• Further tighten the flare nut with torque wrench in
specified torque as stated in the table.

AB

C

Model A B C D

Z25****

Z35****

540 mm 160 mm 18.5 mm 330 mm

For connection joint location at inside building

• Refer to indoor installation instruction.

panner

or Wrench

Torque wrench

33

12.2.3.2 Connecting the Piping to Outdoor

Decide piping length and then cut by using pipe cutter.
Remove burrs from cut edge. Make flare after
inserting the flare nut (locate at valve) onto the copper
pipe. Align center of piping to valve and then tighten
with torque wrench to the specified torque as stated in
the table.

Do not overtighten, overtightening may cause gas leakage

Piping size Torque

6.35 mm (1/4") [18 N•m (1.8 kgf•m)]

9.52 mm (3/8") [42 N•m (4.3 kgf•m)]

12.7 mm (1/2") [55 N•m (5.6 kgf•m)]

15.88 mm (5/8") [65 N•m (6.6 kgf•m)]

19.05 mm (3/4") [100 N•m (10.2 kgf•m)]

12.2.4 Evacuation of the Equipment

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND
PIPES in the following procedure.

Liquid side

Gas side

Hi

Lo

CLOSE

OPEN

Two-way valve

Closed

Three-way valve

Closed

Outdoor unit

Vacuum
pump

Indoor unit

1 Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way

valve.

o Be sure to connect the end of the charging hose with the push pin to the service port.
2 Connect the center hose of the charging set to a vacuum pump.
3 Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from

0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate the air approximately ten minutes.
4 Close the Low side valve of the charging set and turn off the vacuum pump. Make sure that the needle in the

gauge does not move after approximately five minutes.

Note : BE SURE TO TAKE THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.
5 Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.
6 Tighten the service port caps of the 3-way valve at a torque of 18 N•m with a torque wrench.
7 Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “OPEN”

using a hexagonal wrench (4 mm).
8 Mount valve caps onto the 2-way valve and the 3-way valve.

o Be sure to check for gas leakage.

• If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step 3 above take the
following measure:

- If the leak stops when the piping connections are tightened further, continue working from step 3.

- If the leak does not stop when the connections are retightened, repair location of leak.

- Do not release refrigerant during piping work for installation and reinstallation.

- Take care of the liquid refrigerant, it may cause frostbite.

34

12.2.5 Connect the Cable to the Outdoor Unit

removebur

rs3

r

e

1 Remove the control board cover from the unit by loosening the screw.
2 Cable connection to the power supply through Isolating Devices (Disconnecting means).

o Connect approved type polychloroprene sheathed power supply cord 3 x 1.5 mm

designation 60245 IEC 57 or heavier cord to the terminal board, and connect the others end of the cord
to Isolating Devices (Disconnecting means).

o Do not use joint power supply cord. Replace the wire if the existing wire (from concealed wiring, or

otherwise) is too short.

o In unavoidable case, joining of power supply cord between isolating devices and terminal board of air

conditioner shall be done by using approved socket and plug with earth pin rated 15/16A (1.0 ~ 1.5HP).
Wiring work to both socket and plug must follow to national wiring standard.

3 Connection cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 x

1.5 mm

2

flexible cord, type designation 60245 IEC 57 or heavier cord. Allowable connection cable length of

each indoor unit shall be 30 m or less.

4 Connect the power supply cord and connection cable between indoor unit and outdoor unit according to the

diagram below.

321tinuroodniehtnoslanimreT

Colour of wires (connection cable)

Terminals on the outdoor unit LN123

(Power supply cord)

Terminals on the isolating devices
(Disconnecting means)

(L) (N)

5 Secure the power supply cord and connection cable onto the control board with the holder.
6 Attach the control board cover back to the original position with screw.
7 For wire stripping and connection requirement, refer to instruction 12.1.5 of indoor unit.

o Isolating Devices (Disconnecting means) should have minimum 3.0 mm contact gap.
o Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason.
o Always ensure all above connections compliant with national wire rules.

Terminal
Board

2

(1.0 ~ 1.5HP) type

Earth Wire
longer
than
others
AC wire s
for safe ty
reason

WARNING

This equipmentmust be properly earthed.

Holder

Powe r

supply

cord

Isolating
Devices

Indoor &
outdoor

connection

cable

Indoor unit

12.2.6 Pipe Insulation

1 Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation

Diagram. Please wrap the insulated piping end to prevent water from going inside the piping.

2 If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by

using POLY-E FOAM with thickness 6 mm or above.

12.2.6.1 Cutting and Flaring the Piping

1 Please cut using pipe cutter and then remove the burrs.
2 Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.

Turn the piping end down to avoid the metal powder entering the pipe.

3 Please make flare after inserting the flare nut onto the copper pipes.

Improper flaring

1. To cut

Point down

2. To

Pipe

Reamer

Bar

Clamp handle

Handle

Red arrow mark

.Tofla

Yo ke

Core

Bar

0–0.5mm

Copper
pipe



Inclined Surface

When properly flared, the internal surface of the flare will evenly shine
andbeofeventhickness.Sincetheflarepartcomesintocontactwith
the connections, carefully check the flare finish.

damaged



Cracked U neven

thickness

35

13. Installation and Servicing Air Conditioner using R32

13.1 About R32 Refrigerant

For air conditioning refrigerants such as R410A, the refrigerants were collected back in order to prevent their air
dissipation, to curbe the global warming impact, in case they were released into the atmosphere. In the “4th
Environmental Basic Plan”, 80% reduction of greenhouse gas emissions by 2050 is required, and due to this
requirement, further reduction in the emission of high greenhouse effect gas, such as CFCs, is required. Therefore,
the conversion of air conditioning refrigerant into the ones who has smaller greenhouse effect, even if it is dissipated
into the atmosphere, became our responsibility.

Nevertheless, in case of air conditioning refrigerant, it would be the best if there is a refrigerant which has smaller
impact on global warming, but ensures good energy efficiency and performance, and is safe; however, there is no
such refrigerant which satisfies all these conditions. As a result, we have been considering the practical usage, within
the safety frame-work, of R32 refrigerant which has short lifetime in the atmosphere, and has smaller effect of global
warming, but is slightly flammable.

In 2004, due to the revision of air conditioner safety standards by the International Electro-safety Commission (IEC),
the safety standards of air conditioners using slightly flammable refrigerant was issued. In 2010, the regulations of
American Society of Heating, Refrigerating and Air-Conditioning Engineers in the United States (ANSI/ASHRAE34)
was issued adopting the grades for refrigerants which are difficult to inflame due to their slow burning rates, and as a
result have smaller damages in cases of fire. The burning rate of R32 is lower by 10cm / per second, and safety
standardization for various usage is now being processed.

13.2 Characteristics of R32 Refrigerant

1. Chemical Characteristics
R32 is one of the refrigerants used in R410A, has almost no toxicity, and chemically stable compound formed by
hydrogen, carbon and fluorine.

R32 has short lifetime of 4 to 9 years in case of being released into the atmosphere; therefore, it has smaller
greenhouse gas effect but has slight inflammability because of the large proportion of hydrogen.

Chemical Characteristic Table of R32, R410A and R22.

R32 R410A R22

Chemical Formula CH2F2 CH2F2 / CHF2CF3 CHCLF2

Composition

(mixture ratio wt.%)

Boiling Point (°C) -51.7 -51.5 -40.8

Pressure (physical) *1 3.14 3.07 1.94

Capacity (physical) *2 160 141 100

COP (physical) *3 95 91 100

Ozone Depletion Potential (ODP) 0 0 0.055

Global Warming Potential

(GWP) *4

Inflammability *5

Toxicity None None None

Single Composition

675 2090 1810

Slightly Inflammable

(A2L)

*1：Physical property of temperature condition 50°C
*2：Relative value of temperature condition 0/50°C, providing R22=100
*3：Te/Tc/SC/SH=5/50/3/0°C
*4：GWP=Global Warming Potential, each figure is based on “4
*5：Based on ANSI / ASHRAE std. 34-2010

R32 / R125A

(50 / 50 wt.%)

Non-inflammable (A1) Non-inflammable (A1)

th

IPCC4 Report”

Single Composition

36

2. Characteristic of Pressure
As shown in Table 2, R32 does not have much difference in vapor pressure at the same refrigerant temperature
comparing to R410A, but comparing to R22, it is higher at 1.6 times more. Thus, the same as in case of R410A, it is
necessary to do installation and service using high-pressure tools and components.

Table 2. Saturated vapor pressure comparison table

(Unit: MPa)

Temperature

-20 0.30 0.30 0.14

0 0.71 0.70 0.40

20 1.37 1.35 0.81

40 2.38 2.32 1.43

60 3.84 3.73 2.33

65 4.29 4.17 2.60

R32 R410A R22

Refrigerant

Reference： Thermal properties table of Japan Society of Refrigerating and Air Conditioning Engineers (60, 65°C)
NIST REFPROP V8.0 (-20 ~ 40°C)

37

13.3 Refrigerant piping installation • Tools used in services

13.3.1 Required Tools

R32 refrigerant air conditioners use the common parts as R410A air conditioners for two-way valves and three-way
valves (diameters of service ports); thus, they maintain commonality in the maintenance of the compressive strength,
the size of pipe flaring, and the size of flare nuts as R410A. Therefore, for refrigerant pipe installation and services,
you can use tools for R410A.

However, mixing of refrigerants is not allowed, so that you have to separate the cylinders for the recovery of
refrigerants.

Tools used for installation • relocation • replacement of air conditioning units

Works R32 R410A R22

Flaring Flare tools for R410A (clutch type) Flare tools for R22 (clutch type)

Connection of pipes

Manifold gauge charging hose R32 & R410A Common (As at November 2013) R22 Only

Air purging Vacuum pump + Reducer / expander Vacuum pump

Gas leakage test Detection liquid or soup water, HFC detector

Torque wrench (diameter 1/2 5/8) *1 Toque wrench (diameter 1/2 5/8)

*1. Nut diameters of 1/2 5/8, the size of torque wrench common with R410A
For other installation, you can use general tools such as screw drivers (+, -), metal saws, electric drills, long-nose
pliers, hole core drills (ø70 or ø65), linen tape, levels, temperature gauges, clamp meters, electric knives, nippers,
pipe cutters, reamers or scrapers, spring benders, (diameters 1/4 3/8 1/2 5/8), monkey wrenches, fixing wrenches
(17 or 12 mm), feeler gauges, hexagon wrenches (4 mm), testers, megohm testers, etc.

Tools used for services

Works R32 R410A R22

Insertion of refrigerant Digital scale for refrigerant charging, refrigerant cylinders, cylinder adopters and packing *a

Recovery of refrigerant Refrigerant recovery devices, refrigerant cylinders, manifold gauges, charging hoses *b

*a. Use cylinder for each refrigerant, cylinder adopter and packing.
*b. Use refrigerant recovery cylinder separately for each refrigerant (no mixture of refrigerant allowed). Please be
aware that there are some refrigerant collection devices which do not have self-certification.

Torque wrench (diameter 1/4 3/8)

13.3.2 Tools for R32 (common with R410A)

1. Flare gauges
Use flare gauges when you perform flaring with flare
tools (crutch type). Flare gauges are used to set the
pipe ends at 0.5 ~ 1.5 mm from clump bars of flare
tools.

Flare gauges

2. Flare tools (clutch type)
Flare tools have larger holes of clump bars in order
to set the pipe end at 0 ~ 0.5 mm, and have stronger
springs inside to ensure solid flaring torques. These
flare tools can be used commonly for R22.

Flare tools (clutch type)

38

3. Torque wrenches (diameters 1/2, 5/8)
In order to strengthen the compressive strength, the
diameters of wrenches change depending on the flare
nut sizes.

Torque wrenches

Manifold gauges / Charging hoses

Differences in torque wrenches

1/2

(diameter × torque)

5/8

(diameter × torque)

R32

(common R410A)

26 mm × 55 N•m

(550 kgf•cm)

29 mm × 65 N•m

(650 kgf•cm)

R22

24 mm × 55 N•m

(550 kgf•cm)

27 mm × 65 N•m

(650 kgf•cm)

4. Manifold gauges
R22 gauges cannot be used because of the high
pressures.

Each port of manifold has different shapes in order
to prevent inserting wrong refrigerant.
*However, the port shape for R410A and R32 is the
same; therefore, attention need to be paid not to insert
wrong refrigerant.

Differences in high/low pressure gauges

High pressure

gauges (red)

Low pressure
gauges (blue)

-76 cmHg ~ 53 kgf / cm

-76 cmHg ~ 38 kgf / cm

R32

(common R410A)

-0.1 ~ 5.3 MPa

-0.1 ~ 3.8 MPa

R22

-76 cmHg ~ 35 kgf / cm

2

-76 cmHg ~ 17 kgf / cm

2

2

2

Difference in manifold port sizes

Port sizes 1/2 UNF20 7/16 UNF20

R32

(common R410A)

R22

Differences in charging hoses

R32

(common R410A)

5.1 MPa

(52 kgf / cm

27.4 MPa

(280 kgf / cm

HNBR rubber
Internal nylon

coating

2

)

2

)

R22

3.4 MPa

(35 kgf / cm2)

17.2 MPa

(175 kgf / cm2)

NBR rubber

Pressure

Resistance

Material

Normal

operation

pressure

Burst

pressure

6. Vacuum pump and Vacuum pump adopter
When using a vacuum pump, it is necessary to set a
solenoid valve in order to prevent backflow of vacuum
pump oil into the charge hoses, and use a vacuum
pump with oil backflow prevention function, or use the
vacuum pump with vacuum pump adopter.
If vacuum pump oil（mineral oil-based）mixes with

R410A (R32), it may cause damage to the machine.

Vacuum pump

Vacuum pump adopter

5. Charging hoses
The pressure resistance of charge hoses is increased.
At the same time, the material is changed to HFC
resistant, and the size of each manifold adopter is
changed, as the port size of manifold gauge itself.
Further, some hoses are with anti-gas pressure
backflow valves placed near the adopters. (hoses with
the valves recommended)

39

7. HFC refrigerant_Electric gas leakage tester
R32 refrigerant is often used for other mixed
refrigerant (R410A, R404A, R407C etc.). Therefore,
the usage of existing HFC detectors is possible, but in
order to detect more accurately, we recommend to
use detectors specially set and adjusted for R32
detection.

HFC refrigerant_Electric gas leakage tester

9. Refrigerant cylinders
Refrigerant cylinders for R410A are painted in pink,
and the ones for R32 are painted in other colors that
might subject to change according to the international
standards. R32 is a single refrigerant, so that both
liquid and gas insertion are possible. Additional
charging is also possible.
(R410A is a mixed refrigerant, so only liquid insertion
is possible)

Refrigerant cylinders

8. Digital scale for refrigerant charging
R32 and R410A have high pressure level and their
evaporation speed is high.
Thus, if you recover the refrigerant by cylinder
charging method, the refrigerant evaporates within the
weighing scale glass, which makes reading the scale
difficult, rather than liquidating the refrigerant into the
cylinder. (Charging cylinders for R22 have different
pressure resistance, scale, connection port size;
therefore, they are not usable) At the same time, the
digital scale for refrigerant charging is strengthened by
receiving the weight of the refrigerant cylinders with
four pillars at the corners. The connection ports of
charging hoses have two separate ports for R22 (7/16
UNF20) and R32/R410A (1/2 UNF20) therefore, they
can be used for the insertion of the existing
refrigerants.

Digital scale for refrigerant charging

10. Connection ports of refrigerant cylinders and
packing

Charging ports which fit to the charging hose
connection port size (1/2 UNF20) is needed. At the
same time, the packing has to be of HFC resistant
materials.

Connection ports and packing

40

11. Tools used for refrigerant piping installations and services

/

/

Tools for R410A Common with R32 Possibility of usage for R22

1. Pipe cutters, reamers or scrapers

2. Flare tools (clutch type)

3. Torque wrench (1/4, 3/8)

4. Torque wrench (1/2, 5/8)

5.

6. Vacuum pumps, vacuum pump adopters

7. Electric gas leakage testers for HFC *1

8. Digital scale for refrigerant charging

9. HCF recovery devices (connection port 5/16) *2

10. Refrigerant cylinders (pressure resistant: FC3)

11. Refrigerant cylinders (pink)

12. Refrigerant cylinder connection ports and packing

13. Allen wrench (4 mm) Electric knives

*1 Those testers only for HCFC22 (R22), but not for HCF32 (R32) and HCF410A (R410A) cannot be for common use.

*2 Recovery devices which are self-certified for each HCF type can be used.

[Knowledge for the common usage of tools for R410A & R32]

• R410A and R32 machines use different compressor oils.

• If unregulated compressor oil gets mixed into, it may cause damage to the machine function.

• Careful pump down will ensure the recovery of compressor oil, and it will minimize the remaining amount of the oil in the manifold

gauge and charging hose.

• If you only perform the recovery of refrigerant and not be able to perform pump down, you have to dispose the compressor oil in
the charging hose.

[Precaution of repairing refrigerant cycle]

• In the brazing, open 2-way and 3-way valves, and make sure the refrigerant is completely recovered back and not remaining the
system.

• When repairing outside, make sure no refrigerant is in the air, ensure good air flow, and perform the brazing.

Manifold gauges・charging hoses

Other (colors that might subject to

change according to the
international standards).

○ ○
○ ○
○ ○
○ ×
○ ×

○ Connection

5/16

○
○ ○

○ Connection

5/16

Same specs

× ×

○ ×
○ ○

○ Connection

1

4

△

○ Connection

1

4

×

[Inserting wrong refrigerant]

• It may cause “not cooling” and “not heating” customer claims because each component (expansion valve, compressor, PCB) of the
refrigeration cycle is specially adjusted for R32.

• At the same time, it is not subject to product warranty, if wrong refrigerant was inserted into the system.

41

13.4 New installation, Relocation, Repairing of Refrigerant Cycle System The
Procedures

New

Installation

• Displacing pipes and wires, and displacing indoor / outdoor units

Relocation Repairing refrigerant cycle

Indoor / outdoor units and piping

Pump down

Refrigerant recovery

Prevention of impurity

• Dismantling indoor / outdoor units

• Repairing by brazing

Removal

・Indoor / outdoor units installation and piping, and wiring

Evacuation (Air purging) new installation and relocation for at or

more than 15 minutes, re-charging at or more than 60 minutes

Insertion of refrigerant

Leakage checking

Operation testing

42

13.5 Piping installation of R32

/

13.5.1 Pipe materials used and flaring

Copper pipes are used for refrigerant piping. Pipes
which comply with JIS Regulations need to be used.
Room air conditioners which use R410A and R32
have higher pressure; thus, using pipes which comply
with the Regulations is important.
The pipe thickness is regulated by revised JIS B 8607
“Flaring and brazing fittings for refrigerant” and the
pipe thickness for R410A, R32 is shown in the table.

Caution

• For connection piping, use copper phosphate seamless pipes (1220T) as regulated in “JIS H 3300” and the pipe
thickness is 0.8 mm.

• In the market, there are some pipes of 0.7 mm thickness, but do not use these pipes (0.8 mm thickness has to be
strictly followed).

• It is recommended to use pipes whose adhesion amount of oil is at or less than 40 mg / 10 m.
At the same time, do not use pipes with dent, de-shape, and color change (especially inside).

13.5.2 Processing and connection of pipes

For refrigerant pipe installation, be aware of moisture and dirt do not get into the pipes, and make sure of no
refrigerant leakage.
◎ The procedure of flaring and precautions

a) Cutting of pipes：use pipe cutter and cut the pipe slowly not to de-shape the pipe.
b) Removal of burrs on the edge of pipe (reamer or scraper)

If the condition of pipe edge after the deburring is no good or if burrs attaches on the flaring, it may cause
refrigerant leakage. Turn the pipe end down and perform deburring carefully.

c) Insert the flare nut (use the nut which is a part of the CZ parts)
d) Flaring

Ensure the cleanliness of clump bar and pipe, and perform flaring carefully.
Use the existing flare tools or flare tools for R410A. Be aware that the sizes and dimensions of flaring is different
in each flaring tool. If you use the existing flaring tools, use flaring gauge to measure the length of the flaring part.

Dimensions “a” (mm)

Piping

size

(mm)

6.35 (1/4") 0.5 ~ 1.0 1.0 ~ 1.5 0 ~ 0.5 1.0 ~ 1.5 1.5 ~ 2.0 0 ~ 0.5 17 17

9.52 (3/8") 0.5 ~ 1.0 1.0 ~ 1.5 0 ~ 0.5 1.0 ~ 1.5 1.5 ~ 2.0 0 ~ 0.5 22 22

12.70 (1/2") 0.5 ~ 1.0 1.5 ~ 2.0 0 ~ 0.5 1.0 ~ 1.5 2.0 ~ 2.5 0 ~ 0.5 24 26

15.88 (5/8") 0.5 ~ 1.0 1.5 ~ 2.0 0 ~ 0.5 1.0 ~ 1.5 2.0 ~ 2.5 0 ~ 0.5 27 29

Flare tools

Clutch type

R22

Wing nut

type

Flare tools
for R410A

Clutch type Clutch type

Dimensions “a” (mm)

R410A

Flare tools

Wing nut

Pipe thickness

Diameter

R32

type

Clutch type R32

O and OL materials Thickness (mm)

Diameter

(mm)

1/4 6.35 0.80

3/8 9.52 0.80

1/2 12.70 0.80

5/8 15.88 1.00

Flare tools

for R410A

Bar

R410A R32 R22

Nut outer diameter (mm)

a

R22

R410A

43

13.6 Installation, Relocation, and Service

13.6.1 Air purge and gas leak test for new installation (using new refrigerant pipes)
using vacuum pump

(From the point of view of global environment protection, do not release CFCs into the atmosphere during installation
work)

1. Connect the charging hose of manifold gauge to the service port of 3-way valve (pushing insect pin).

2. Fully open the handle Lo of manifold gauge and operate vacuum pump.

(If the needle of the low-pressure gauge reaches the vacuum immediately, check 1 procedure again)

3. Perform vacuuming 15 minutes or more, and make sure low pressure gauge reaches to －0.1 MPa (-76cmHg).

When the vacuuming completes, fully open the handle Lo of manifold gauge and stop the operation of vacuum
pump, and leave it for 1 ~ 2 minutes. Then, remove the connection side of the charging hose of vacuum pump
adopter after checking the needle of manifold gauge does not turn back.

4. Open the stem of 2-way valve to 90° in anti-clock wise, and close the 2-way valve after 10 seconds, and perform

gas leakage test.

5. Remove the charge hose from the service port of 3-way valve, and open the stems of 2-way and 3-way valves

(open the valves to anti-clock wise carefully, do not use full strength to open)

6. Tighten the service port cap with torque wrench 18

Tighten the caps of 2-way and 3-way valves with torque wrench 18 N•m (1.8kg f•m)

7. After the tightening of each cap, check gas leakage around the cap.

N•m (1.8 kgf•m)

Liquid side

Gas side

2-way valve

Hex wrench

Valve stem caps

Service
port cap

Service port
valve core

-0.1 MPa

(-76cmHg)

3-way valve

Low-pressure

Lo Handle

Vacuum pump

adaptor

gauge

High-pressure
gauge

Manifold gauge

Hi Handle

Charging hoses

Vacuum

pump

44

13.6.2 Process of refrigerant recovery

1. Connect the center charging hose of manifold gauge to the in-let side of recovery device.

2. Connect the valves of the discharge side of recovery device and liquid side of refrigerant cylinder with red hose
(charging hose).

3. Connect the yellow float switch cable of the recovery device to the refrigerant cylinder.

4. Open the low pressure side valve of manifold gauge.

5. Slightly loosen the charging hose of in-let connecting side of recovery device and perform air purge.

6. Open the liquid valve of refrigerant cylinder and slightly loosen the charging hose in discharging side of recovery
device, and perform air purge (the recovery cylinder needs slight inside pressure).

7. Insert electric plug of recovery device into electrical outlet (the fan operation starts).

8. Turn the valve 1 and 2 of recovery device to pressure equalization point.

9. After a few seconds, turn back the valve 1 and 2 to the original position.

10. Turn the switch of the recovery device to “ON”. (the compressor operation starts)

11. When the low pressure of manifold gauge is close to “0”, close the low pressure side valve, turn “OFF” the
recovery device switch.

12. Remove the center charging hose of manifold gauge from the recovery device.

(Indoor unit) (Outdoor unit)

Vacuum

Pump

(Liquid side)

Two-way valve

Close

(Gas side)

Three-way valve

Close

HiLo

45

13.6.3 Relocation

1. Removing the air conditioning unit
a) Recovery of outdoor unit refrigerant by pumping down

Press “forced cooling button” (as a general rule, since 1998 the name of cooling testing button is changed,
and this name is unified within the air conditioning industry), and then you are able to start cooling operation
in which the room temperature is low, and you can recover the refrigerant from the outdoor unit.

1. Check the valve stems of two-way and three-way valves are open by being turned to anti-clockwise
(Remove the caps, and confirm the bars are fully open. Use hexagon wrench <4 mm> to open and close
the valves).

2. Press the “Emergency Operation” button of the indoor units for five seconds and release [Forced cooling
operation] (for old models, press “forced cooling” button). Then, operate the air conditioning unit for about
10 minutes.

3. Turn the stem of the two-way valve to the clock-wise and close the valve.

4. After about 2 ~ 3 minutes, turn the stem of the three-way valve quickly to the clock-wise, and stop the
operation.

Caution: In the pump down operation, stop the compressor before removing the refrigerant pipes.

If you do not stop the compressor operation, and if the valve is open and remove the refrigerant pipes, the air
may be sucked into the system and causes extreme high temperature in the refrigerant cycle. This may result in
rupture or injury, etc.

5. Attach and tighten the caps of two-way and three-way valves with torque wrench.

6. Remove the connecting pipes (liquid side and gas side).

b) Removal of indoor and outdoor units

1. Remove the connecting pipes and wires between the indoor and outdoor units.

2. Attach capping flare nuts on the edges of the pipes, connecting the indoor and outdoor units, in order to
prevent dust and moisture get into the pipes.

3. Remove the indoor and outdoor units.

2. Unit installation
Use new refrigerant pipes for the installation, and perform air purging using vacuum pump and gas
leakage testing stated in 14.5.1.

13.6.4 Replacement of air conditioning units and evacuation (when re-using the existing
pipes)

When replacing the air conditioning units, you might use the existing pipes, but it is recommended to perform flaring
again. In case of unit replacement, even if the unit is new refrigerant air conditioner, if the refrigerant oil is different, it
may cause problem. Further, when re-using the existing refrigerant pipes, it is recommended to evacuate the pipes
as much as possible, due to the reason that much refrigerant oil may be attached on the surface of the pipes. If the
pipes are used without evacuation, the remaining refrigerant oil may cause under-performance and abnormal
refrigerant cycle caused by non-compatibility of those oils.

13.6.5 Inter-changeability of refrigerant

Do not operate air conditioning units inserting wrong (or mixed) refrigerant (R22, R410A, R32). It may cause mal­function of the units, and at the same time, may cause serious incident such as rupture of the refrigerant cycle.

46

13.6.6 Re-insertion of refrigerant in service

When re-insertion is needed, follow the procedures to ensure the insertion of new refrigerant at correct amount.

1. Attach charging hose (blue) to the service port of the outdoor unit.

2. Attach charging hose (red) to the vacuum pump. Fully open the 2-way and 3-way valves.

3. Place the refrigerant cylinder on the digital scale for refrigerant charging and connect the charge hose (yellow) to
the connection port of the vacuum pump and the digital scale. Leave the cylinder valve fully open.

4. Fully open the handles Lo and Hi of the manifold gauge, and switch on the vacuum pump, and then perform
evacuation for at or more than one hour.

5. Confirm the compound gauge of -0.1 MPa (-76cmHg) and fully open the handles of Lo and Hi, and switch off the
vacuum pump. Leave it for about 1 ~ 2 minutes and confirm the needle of the compound gauge does not turn
back.
Refer to the picture below to follow the procedures below.

6. Remove the charging hose (red) of the manifold gauge from the vacuum pump adopter.

7. After adjusting the digital scale to zero, open the cylinder valve and the valve Lo of the manifold gauge, and
insert the refrigerant.

8. If it is not possible to insert the refrigerant at regulated amount at once, operate the cooling mode and gradually
insert the refrigerant (recommended amount approx. 150 g / 1 time)
*Do not insert much refrigerant at once.

9. Close the open/close valve and insert the refrigerant in the charging hose to the outdoor unit.
*Perform this procedure during operating cooling operation. Close the stem of the two-way valve, and when the
pressure of the manifold gauge becomes zero (0), quickly remove the charging hose (blue). Immediately open
the 2-way valve, and stop the cooling operation.

10. Final checking • • • Confirm the 2-way and 3-way valves are fully open.
Attach the caps of the service port and control valve, and then check the gas leakage around the caps.

(Indoor unit)

(Liquid side)

Open

(Outdoor unit)

Vacuum pump
charging hose

Vacuum

pump

adaptor

Vacuum

pump

Electronic scale

(Gas side)

HiLo

Two-way

valve

Three-way

valve

Open

47

13.7 Repairing of refrigerant cycle / Brazing point

13.7.1 Preparation for repairing of refrigerant cycle / brazing

Brazing which is a technique needed for repairing refrigerant cycle requires advanced technique and experience, and
this brazing procedure can only be performed by the workers who completed “Gas Welding Skill Training” regulated
by the Occupational Safety and Health Act, and went through the training programs of refrigerant operations.
Dismantling and re-connecting (assembling) refrigerant system requires working space, and the space has to ensure
good air flow and fire prevention (water bucket and fire extinguisher). Moreover, the worker has to ensure the
wearing of goggles, grabs, safety shoes, and long sleeve shirts, and be aware of work safety and attempt to prevent
secondary defect (quality assurance of products). For brazing the indoor / outdoor unit structural components (heat
exchangers, compressors, expansion valves, four-way valve blocks), after the recovery of all refrigerant, confirm that
no refrigerant remains in the system, and fully open the 2-way and 3-way valves. When the brazing is conducted
outside, check and make sure no refrigerant is contained in the air (be careful with vaporized refrigerant).
Furthermore, protect the compressor terminal with metal plates, and heat but use wet clothes to cool down (releasing
the heat) the expansion valves, and four way valves (prevent destruction of parts). In brazing, it is important to pour
the brazing material without melting the base metal based on capillary action principle. In case of holes and oxidizing
caused by overheating, do not perform re-brazing or alteration but replace the parts.

13.7.2 Adjustment of vacuum pump pressure

1. Cylinder with adjustment handle

1. Check and confirm the adjustment handle of the 1
valve is opened when the 1

st

gauge pressure adjust handle is closed, the 2nd gauge might get broken.

The primary gauge

(High pressure)

Main valve

st

pressure adjuster is loosen (anticlockwise). If cylinder

Main valve

Adjustment

handle

The secondary gauge

(Low pressure)

2. Open the cylinder valve, and check the remaining amount with the first t side pressure gauge.

3. Check the pressure of 2
pressure.

◎ Oxygen 2
◎ Propane 2

Adjustment

handle

Oxygen regulator

nd

gauge and turn the adjustment handle to clock-wise direction to adjust the

nd

side gauge pressure・・・・・・・・・・0.5 MPa (5.0 kgf / cm2)

nd

side gauge pressure・・・・・・・0.05 MPa (0.5 kgf / cm2)

The secondary gauge

(Low pressure)

Propane regulator

48

2. Cylinder without adjustment valve

nd

2

side gauge pressure is adjusted by the adjuster.
Check the both side valves of the torch and open the cylinder valve to check the remaining refrigerant in the
cylinder.
Caution: Do not attach oil component on the connection port of the adjuster.
Especially, use an oxygen cylinder adjuster which is no oil substance type. Do not dismantle or repair the
adjuster and pressure gauge.

Main valve

Fuel gauge

0~3 MPa

(0~30 kgf / cm²)

Main valve

Regulator

Propane tank

(Gray)

Fuel gauge

0~25 MPa

(0~250 kgf / cm²)

Regulator

Oxygen tank

(Black)

Black hose

Orange hose

13.7.3 Checking of gas provision

Checking there is no fire around the torch, and then confirm the provision of gas.

1. Slightly open the “propane valve” of the torch, and make sure the gas comes out from the torch crater and then
close the “propane valve”.

2. Slightly open the “oxygen valve” of the torch and make sure the gas comes out from the torch crater and then
close the “oxygen valve”.
Check there is no gas leakage around the hose connection.

13.7.4 Adjustment of flame

1. Slightly open the “propane valve” of the torch and lit with spark lighter.
This moment, the flame is only by propane and the color is red.

2. Gradually open the “oxygen valve” of the torch to mix oxygen, and adjust the amount of propane and oxygen with
the valve to make the flame suitable for brazing work.
If the white core flame splits into two, the torch crater might be clogged. In this case, remove the crater from the
torch and check.

Oxygen (Black hose)

Oxygen valve

Nozzle

Propane valve

Propane (Orange hose)

49

13.7.5 Types of flame

Types of flame change based on the proportion of propane and oxygen.

[Neutral Flame]

Perform brazing with this flame
(This is a flame when oxygen and propane are mixed at proper proportion, and has lesser effect on the brazed
metals)

White core flame

10 ~ 15 mm

Outer flame (Light orange color)

[Carbide Flame]

When propane is excessive, the flame has white color flame in between the white core flame and outer flame.
(This is due to the lack of oxygen and the proportion of unburned propane is excessive.
The black carbon created during the brazing work may contaminate the surface of the brazed metal).

White core flame

Pale white

[Oxidizing Flame]

Oxygen is more compared to the neutral flame. Although the flame size is small, this has the highest flame heat.
However, due to the excessive oxygen contained in the flame, the brazing point gets oxidized. (This flame may cause
holes, due to the high heat. The pipe may get melt）

White core flame

Outer flame (Blue orange color)

Outer flame (Blue color)

13.7.6 Closing the flame

[In case of short break]

1. Close the “propane valve” of the torch.

2. Close the “oxygen valve” of the torch.

[In case of finishing work]

1. As above, close the flame following the procedure of “In case of short break”.

2. Completely close the valves of oxygen and propane cylinders.

3. Release the remaining gas inside the hose by opening the “oxygen valve” and “propane valve” of the torch.
Confirm the 1

st

and 2nd side gauge pressures of “oxygen” and “propane” cylinder pressure adopter are “zero”.

50

13.7.7 Selection of brazing material

j

Use BAg brazing material (silver solder) to increase the welding performance.

635

~

760

620

~

760

700

~

845

690

~

815

690

~

815

720

~

815

705

~

815

Tensile strength

(Reference)

Base

2

Kgf•cm

material

45.5

45.5 S20C

45.5 S20C

24.5

24.5

24.5

35

~

70

21

~

21

~

21

~

S20C

SS

~

SUS

Cu

Cu

Cu

Characteristics

and

applications

Liquidity is good at

low temperature,
it is preferable to

a small junction of

the gap in the

universal form.

It has similar

performance to the

1A, and

BAg •

suitable for every

base material

except the light

weight metal.
It is a brazing

filler metal in

universal form,

suitable for a

slightly larger gap

unction.

It has good

corrosion

resistance in

stainless

steel-based

brazing, suitable for

brazing tungsten

carbide, aluminum

bronze and copper.

Good liquidity,

suitable for brazing

copper tube.

Suitable for brazing

when the joint

spacing is not

constant

When brazing of

copper and copper,

it is used without a

flux, but not

possible for brazing

basic materials

Category

BAg

BCuP

JIS

Standard

Number

BAg •

1A

BAg • 1

BAg • 2

BAg • 3

BCuP-2

BCuP-3

BCuP-5

49.0

51.0

44.0

56.0

34.0

36.0

48.0

51.0

14.5

15.5

Composition of ingredients (%) Temperature (°C)

Ag

—

4.8

5.2

Cu Zu Cd Ni P Solidus Liquidus

14.5

~

16.5

14.0

~

16.0

25.0

~

27.0

14.5

~

16.5

remain

~

remain

~

remain

14.5

~

~

~

~

~

18.5

14.0
~

18.0

19.0
~

23.0

13.5
~

17.5

— — —

— — —

— — —

17.0
~

19.0

23.0
~

25.0

17.0
~

19.0

15.0
~

17.0

— —

— —

— —

2.5

3.5

—

~

6.8

7.5

5.8

6.7

4.8

5.3

~

~

~

approx.

625

approx.

605

approx.

605

approx.

630

approx.

710

approx.

645

approx.

645

Brazing

temp

approx.

635

approx.

620

approx.

700

approx.

690

approx.

785

approx.

815

approx.

800

Caution
BCuP (phosphorus copper wax) is easy to react with sulfur, and makes a brittle compound water soluble, and causes
gas leakage. In hot spring areas, use other brazing materials or paint the surface for protection.

13.7.8 Need of flux

Use flux to protect the base materials.

1. Remove impurity and oxide film on the metal base, and improve the flow of the brazing material.

2. Prevent oxidation of the metal surface in brazing.

3. Reduce the surface tension of the brazing material.

13.7.9 Need of nitrogen gas

In order to prevent oxidation in the pipe, perform the brazing operation in nitrogen gas flow.
Flow rate 0.05 m

3

/ h, or pressure reducing valve at 0.02 MPa (0.2kgf / cm2) below.

51

13.7.10 Checking of brazing (insert) points

1. No impurity on the brazing point
If dirt or oil is attached on the brazing point, the
brazing filler metal does not reach to junction, and
it may cause poor welding.

2. Adequate gap space in the brazing point
The advantage of capillary current situation is
used in brazing. If the gap space is too large, this
phenomenon may not occur and it may cause
poor welding because brazing filler metal does not
flow to join the front part.

3. Appropriate size for insertion
The guideline for pipe insertion dimensions is to
three times the diameter of the base material, but
you need to decide the insertion size in
consideration of the clogging of the brazing
material. Generally, for thin pipes, you need to
increase the insert size, and for thick pipe vice
versa.

4. Brazing material to flow from top to bottom
Brazing filler metal will easily flow to the
connecting portion by capillary action.
Further, by bending the brazing portion of [dryer
side] of the capillary tube at 15 mm from the tube
top to the angle of about 120°, you can prevent
the damage of dryer inside and the clogging of
brazing material caused by the excessive insertion
of capillary tube.

Inner diameter ø6.45

Insert diameter 10 ~ 25 mm

Brazing material

(Runny)

Brazing material

(Hard to flow)

120°

Capillary

tube

15 mm

Gap 0.025 ~ 0.05 mm

Outer diameter ø6.35

Dryer

Filter

(Wire mesh)

13.7.11 Brazing and heating

1. Place the flame to a pipe which has more heat
capacity in order to let the brazing material melt by
the pipe heat. Heat the pipe up to the melting
temperature of the brazing material, but when it is
overheating, assess the temperature by pipe color
in order not to melt the pipe.

The pre-heating is to heat the base material until the melting temperature, and requires certain training to distinguish
the color of the heated base material in order not to melt the material.
The color and temperature of copper tube

• Becoming red color • • • • • • • 480°C

• Dull red • • • • • • • 650°C

• Cherish red • • • • • • • 760°C

• Brightening cherish red • • • • • • • 870°C

52

Brazing

material

Burner Burner

Brazing

material

(Reference)
Melting temperature of copper • • • • • • • Approx. 1083°C
Maximum temperature obtained in propane and oxygen • • • • • • • Approx. 1083°C
The important point is to heat the bonding part uniformly within a short period of time until reaching to the brazing
temperature in the following manner.

2. Apply the flame on to the side with better heat transmission. If the pipe thickness is consistent, by heating like
30% iron and 70% copper, the copper pipe inside reaches to brazing temperature.
Iron pipes have low heat transmission and only the part the flame is applied get high temperature, and this
causes oxidization of the pipe. The flow of the brazing filler is affected negatively.

3. Apply the flame on to the side of larger heat
capacity.
When brazing a thin tubes such as capillary tube
and dryer, etc., caution has to be taken to apply
the flame to the dryer side (thick pipe side), in
order to prevent burn out by the heat.

4. When brazing the compressor connection pipes
(suction and discharge), remove the sound
insulation plate and the fan, and place the
compressor stand vertically (to prevent the
leakage of compressor refrigerating machine oil),
and apply the flame from the compressor body
side.

13.7.12 Terminologies of brazing

Pin holes → Small holes are generated on the surface of the brazing metal.
Wet temperature → Liquidus temperature at which the brazing material starts flowing out by heating, generally it is
the liquidus-line temperature.
Blow holes → Hollows made by gas in the brazing material of brazing portion (gas reservoirs).
Pits → As a result of blow holes, small dents generated on the outside surface of welding.
Voids → The blazing material does not reach completely to the brazing part. It cannot be identified from outside.

53

13.8 <Reference> Analysis method for no error code, no cooling / no
warming

13.8.1 Preparation for appropriate diagnosis

In order to obtain appropriate operation characteristics, minimum 15 minutes or more operation time [testing
operation (rated operation)] is required.

1. Method of rated operation (rated operation)

For the models which have two buttons of “emergency operation and forced cooling operation”, press forced
cooling button once. For the models which have only emergency operation button, press the button once for 5
seconds and when hear “beep” sound, release the button. Then, cooling operation starts.

2. Checking the mal-functions of indoor / outdoor units

1) Any obstacles against heat release and air suction? (short circuit)
(Forget to remove the outdoor unit cover or fallen leaves blocking the outdoor unit)

2) Are the indoor unit air filters clean? (obstructing heat suction)

3) Is the setting temperature on the remote controller correct? (is the setting temperature set at lower/higher
than the room temperature?)

13.8.2 Understanding and verification of refrigerant cycle

Low
temp/
Pressure
liquid

Suction temp

「Indoor 「」 Outdoor」

Liquid side

2-way

valve

Heat exchanger

Mid temp /
high pressure
liquid

Heat exchanger

temp

Low temp /
Low pressure

liquid

Mid temp /

High temp

liquid

Expansion

valve

Capillary tube

Low temp /
Low pressure
Liquid

Mid temp /

High pressure

Liquid

Outdoor temp

Heat exchanger

Evaporator

（EVA）

Fan

Low temp
Low pressure

Air

Indoor unit Temp difference

Suction temp ＜Cooling＞ ８
Release temp ＜Heating＞ １

＊

Measured after 15 mins with strong

fan operation

or more

４ or more

High temp / high
pressure

Air

(Cooling Heating )

(Heating)

G

as pressure 2.2～ 3.0MPa

Gas side

3-way

valve

(Cooling)

G

as pressure 0.9～1.2MPa

High temp /
High pressure

Air

Low temp /
Low pressure

Air

4-way

valve

Condenser

（COND）

Low temp /
Low pressure
Air

Release temp

Compressor

（COMP）

FM

Heat exchanger

High temp
High pressure

Air

Fan

temp

54

1. Measuring temperature

1) Indoor unit suction temperature, release temperature, temperature difference, → Measure by thermometer

2) 2-way valve pipe temperature in cooling mode is low temperature (benchmark：5 ~ 10°C), in heating mode
is medium temperature (benchmark：25 ~ 35°C).

3) 3-way valve pipe temperature in cooling mode is low temperature (benchmark：7 ~ 15°C) in heating mode is
high temperature (benchmark：38 ~ 50°C).

2. Measuring electric current

• Measuring electric current in operation → check by clump meter (refer to table of technical characteristic
guideline)

3. Meauring pressure

• Measuring gas pressure → check the pressure by manifold gauge (refer to table of technical characteristic
guideline)

4. Any sound from the expansion valve?
(when starting the operation and the outdoor unit is turned on, the expansion valve is re-set, check if there is any
edged sound or clack sound)

13.8.3 Guidance for diagnosis of refrigerant cycle

Comparison with
normal operation

Refrigerant

pressure

Operation electric

current

2-way valve

temperature

3-way valve

temperature

Excess insertion of refrigerant Clogged capillary, expansion valve malfunction

Heat releasing obstruction Clog by moisture

Dirty condenser, attachment of impurity Lack of refrigerant gas

Compressor malfunction

Excess insertion of refrigerant Lack of refrigerant gas

Heat releasing obstruction Compressor malfunction

Dirty condenser, impurity Mixture of air

Excess insertion of refrigerant Clogged capillary, expansion valve malfunction

Compressor malfunction Lack of refrigerant gas

Lack of refrigerant gas • Compressor malfunction Excess insertion of refrigerant

Clogged capillary, expansion valve malfunction

High Low

(Insufficient evacuation)

Suction

temperature

&

Release air

temperature

• Heat releasing obstruction • Dirty condenser • Attachment of impurity

• Lack of refrigerant gas • Excess insertion of refrigerant

• Mixture of air • Mixture of moisture

• Clogged capillary • Expansion valve malfunction • Compressor malfunction

Temperature difference at or less than 8°C in cooling operation • • • Causes

◎ Above all are based on the condition that the installation work is properly performed (no issues in indoor / outdoor

pipe connections, etc.)

Cooling mode

55

14. Operation Control

14.1 Basic Function

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.

14.1.1 Internal Setting Temperature

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.

Remote Control Setting Temperature

16.0°C ~ 30.0°C

Auto Operation Mode Shifting

Indoor Air Temperature Shifting

Outdoor Air Temperature Shifting

Powerful Mode Shifting

Setting Temperature Limit Checking

(Min: 16.0°C; Max: 33.0°C)

Internal Setting Temperature

14.1.2 Cooling Operation

14.1.2.1 Thermostat control

• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.5°C continue for 3 minutes.

• When compressor is OFF (Thermostat OFF) and AUTO FAN is set, the fan will stop periodically.

• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >

Compressor OFF point.

14.1.3 Soft Dry Operation

14.1.3.1 Thermostat control

• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.0°C continue for 3 minutes.

• When compressor is OFF (Thermostat OFF) and AUTO FAN is set, the fan will stop periodically.

• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature >

Compressor OFF point.

14.1.4 Heating Operation

14.1.4.1 Thermostat control

• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature > +2.0°C continue for 3
minutes.

• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature <
Compressor OFF point.

56

14.1.5 Automatic Operation

• This mode can be set using remote control and the operation is decided by remote control setting temperature,
remote control operation mode and indoor intake air temperature.

• During operation mode judgment, indoor fan motor (with speed of Lo-) is running for 30 seconds to detect the
indoor intake air temperature.

• Every 10 minutes, the indoor temperature is judged.

• For the 1st judgment

o If indoor intake temperature - remote control setting temperature ≥ 2.0°C, COOL mode is decided.
o If -2.0°C ≤ indoor intake temperature - remote control setting temperature < 2.0°C, DRY mode is decided.
o If indoor intake temperature - remote control setting temperature < -2.0°C, HEAT mode is decided.

Heat

Dry Cool

6.05.04.03.02.01.00.0-1.0-2.0-3.0-4.0-5.0-6.0

• For the 2nd judgment onwards

o If indoor intake temperature - remote control setting temperature ≥ 4.0°C, if previous operate in DRY mode,

then continue in DRY mode. otherwise COOL mode is decided.

o If -2.5°C ≤ indoor intake temperature - remote control setting temperature < 4.0°C, maintain with previous

mode.

o If indoor intake temperature - remote control setting temperature < -2.5°C, HEAT mode is decided.

Maintain

Heat

-5.0-6.0

-4.0

current mode

Cool
/Dry

6.05.04.03.02.01.00.0-1.0-2.0-3.0

14.1.6 Fan Operation

• Fan operation is used to circulate air in a room.

• During operation, indoor fan run continuously but outdoor fan and compressor stop.

• Temperature setting is not applicable.

14.2 Indoor Fan Motor Operation

14.2.1 Basic Rotation Speed (rpm)

A. Basic Rotation Speed (rpm)

i. Manual Fan Speed
[Cooling, Dry]

• Fan motor’s number of rotation is determined according to remote control setting.

Remote control ○ ○ ○ ○ ○

Tab Hi Me+ Me Me- Lo

[Heating]

• Fan motor’s number of rotation is determined according to remote control setting.

Remote control ○ ○ ○ ○ ○

Tab SHi Me+ Me Me- Lo

57

ii Auto Fan Speed
[Cooling, Dry]

• According to room temperature and setting temperature, indoor fan speed is determined automatically.

• When set temperature is not achieved, the indoor fan will operate according to pattern below.

• When set temperature achieved, the indoor fan speed will be fixed. When thermostat off, the fan stop

periodically.

[Fan]

• Indoor fan speed is fixed at predetermined speed.
[Heating]

• According to indoor pipe temperature, automatic heating fan speed is determined as follows.

RPM Increased

o

C

40

o

C

19

Indoor Pipe Temp.

RPM Maintain

RPM Reduced

OFF

35oC

16oC

B. Feedback control

• Immediately after the fan motor started, feedback control is performed once every second.

• During fan motor on, if fan motor feedback ≥ 2550 rpm or < 50 rpm continue for 10 seconds, then fan motor error

counter increase, fan motor is then stop and restart. If the fan motor counter becomes 7 times, then H19 - fan
motor error is detected. Operation stops and cannot on back.

14.3 Outdoor Fan Motor Operation

• It starts when compressor starts operation and it stops 30 seconds after compressor stops operation.

58

• During cooling operation, and outdoor ambient temperature is below 8°C, outdoor fan speed will be controlled
according to outdoor piping temperature as following:

OD Pipe Temperature

A 26°C

B 33°C

• During above condition, when indoor heat exchanger temperature is below 5°C, the outdoor fan will stop
according to outdoor piping temperature as following:

14.4 Airflow Direction

• There is one type of airflow, vertical airflow (directed by horizontal vane).

• 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).

14.4.1 Vertical Airflow

Operation Mode Airflow Direction

Auto with Heat Exchanger A Upward fix 20

Heating

Cooling

Soft Dry

B Downward fix 58

Temperature C Upward fix 20

Manual 20 33 45 58 70

Auto 20 ~ 70

Manual 20 33 45 58 70

Auto 20 ~ 70

Manual 20 33 45 58 70

1.

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.

2.

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.

All open

Upper Vane Angle (°)

1 2 3 4 5

58°C

37°C

Indoor Heat Exchanger

Temperature

A

B

C

Figure 1

50°C

30°C

59

Upper limit

Swing

5

Lower limit

All close

1

2
3
4

Figure 2

14.4.2 Horizontal Airflow

• The horizontal airflow direction louver can be adjusted manually by hand.

14.5 Quiet Operation (Cooling Mode/Cooling Area of Dry Mode)

• Purpose

o To provide quiet cooling operation compare to normal operation.

• Control condition

o Quiet operation start condition

 When “QUIET” button at remote control is pressed twice.

QUIET LED illuminates.

o Quiet operation stop condition

 When one of the following conditions is satisfied, quiet operation stops:

• QUIET button is pressed again.

• Stop by OFF/ON switch.

• Timer “off” activates.

• +8/15°C HEAT ON.

 When quiet operation is stopped, operation is shifted to normal operation with previous setting.
 When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.
 When operation mode is changed, quiet operation is shifted to quiet operation of the new mode.
 During quiet operation, if timer “on” activates, quiet operation maintains.
 After off, when on back, quiet operation is not memorised.

• Control contents

o Fan speed is changed from normal setting to quiet setting of respective fan speed.

Fan speed for quiet operation is reduced from setting fan speed.

14.6 Quiet Operation (Heating)

• Purpose

o To provide quiet heating operation compare to normal operation.

• Control condition

o Quiet operation start condition

 When “QUIET” button at remote control is pressed.

QUIET LED illuminates.

o Quiet operation stop condition

 When one of the following conditions is satisfied, quiet operation stops:

• QUIET button is pressed again.

• Stop by OFF/ON switch.

• Timer “off” activates.

• +8/15°C HEAT ON.

 When quiet operation is stopped, operation is shifted to normal operation with previous setting.
 When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed.
 When operation mode is changed, quiet operation is shifted to quiet operation of the new mode, except

fan mode only.

 During quiet operation, if timer “on” activates, quiet operation maintains.
 After off, when on back, quiet operation is not memorised.

• Control contents

o Fan speed manual

 Fan speed is changed from normal setting to quiet setting of respective fan speed.
 Fan speed for quiet operation is reduced from setting fan speed.

o Fan Speed Auto

 Indoor FM RPM depends on pipe temp sensor of indoor heat exchanger.

14.7 Powerful Mode Operation

• When the powerful mode is selected, the internal setting temperature will shift lower up to 2.0°C (for Cooling/Soft
Dry) or higher up to 3.5°C (for Heating) than remote control setting temperature to achieve the setting
temperature quickly.

60

14.8 Timer Control

• There are 2 sets of ON and OFF timer available to turn the unit ON or OFF at different preset time.

• If more than one timer had been set, the upcoming timer will be displayed and will activate in sequence.

14.8.1 ON Timer Control

• ON timer 1 and ON timer 2 can be set using remote control, the unit with timer set will start operate earlier than
the setting time.
This is to provide a comfortable environment when reaching the set ON time.

• 60 minutes before the set time, indoor (at fan speed of Lo-) and outdoor fan motor start operate for 30 seconds to
determine the indoor intake air temperature and outdoor air temperature in order to judge the operation starting
time.

• From the above judgment, the decided operation will start operate earlier than the set time as shown below.

14.8.2 OFF Timer Control

OFF timer 1 and OFF timer 2 can be set using remote control, the unit with timer set will stop operate at set time.

14.9 Auto Restart Control

• When the power supply is cut off during the operation of air conditioner, the compressor will re-operate within
three to four minutes (there are 10 patterns between 2 minutes 58 seconds and 3 minutes 52 seconds to be
selected randomly) after power supply resumes.

• This type of control is not applicable during ON/OFF Timer setting.

• This control can be omitted by open the circuit of JP1 at indoor unit printed circuit board.

14.10 Indication Panel

LED POWER / +8/15°C HEAT TIMER / DEICE nanoeX

Color White / Blue White / Blue White

Light ON Operation ON / +8/15°C HEAT ON Timer Setting ON / Deice ON nanoe™ X Mode ON

Light OFF Operation OFF / +8/15°C HEAT OFF Timer Setting OFF / Deice OFF nanoe™ X Mode OFF

Note:

• If POWER LED is blinking, the possible operation of the unit are Hot Start, during Deice operation, operation
mode judgment, or ON timer sampling.

• If Timer LED is blinking, there is an abnormality operation occurs.

61

14.11 nanoe™ X Operation

• Generate nanoe™ X (water wrapped ion particle) to moisturize skin, provide deodorization & sterilization effect.

• nanoe™ X operation start condition

o During unit running at any operation mode, if nanoe™ X operation is activated, combination operation

(operation mode + nanoe™ X operation) starts.

o During unit is OFF, if nanoe™ X operation is activated, nanoe™ X individual operation starts.

• nanoe™ X operation stop condition

o When OFF/ON button is pressed to stop the operation.
o When nanoe™ X button is pressed.
o When OFF Timer activates.

• nanoe™ X operation pause condition

o When indoor fan stop (during deice, odor cut control, thermostat off, etc.). nanoe™ X operation resume after

indoor fan restarts.

o When indoor intake temperature ≥ 35°C and < 5°C. nanoe™ X operation resume after indoor intake

temperature < 35°C or ≥ 5°C continuously for 6 minutes.

• Indoor fan control
o During any operation mode combines with nanoe™ X operation, fan speed follows respective operation

mode. However, nanoe™ X system enabled when fan speed ≥ 390 rpm to ensure proper negative ion
distribution, nanoe™ X system disabled when fan speed < 390 rpm.

o During nanoe™ X individual operation, fan speed follow remote control setting. Auto Fan Speed for nanoe™

X individual operation is cooling medium fan. Powerful & Quiet is disabled during nanoe™ X.

• Airflow direction control
o During any operation mode combines with nanoe™ X operation, airflow direction follows respective operation

mode.

o During nanoe™ X individual operation, Air Swing follow remote control setting.

• Timer control
o When ON Timer activates when unit stops, previous operation resumes and restored last saved nanoe™ X

operation status.

o When ON Timer activates during any operation, no change on current operation.
o When OFF Timer activates during any operation, all operation stops and the latest nanoe™ X operation

status is saved.

• Indicator
o When nanoe™ X starts, nanoe™ X indicator ON.

• Remote control receiving sound

o Normal Operation  nanoe™ X Operation : Beep
o nanoe™ X Operation  Normal Operation : Beep
o Stop  nanoe™ X individual Operation : Beep
o nanoe™ X individual Operation  Stop : Long Beep

• Power failure

o During nanoe™ X individual operation, if power failure occurs, after power resumes, nanoe™ X individual

operation resumes immediately.

o During combination operation, if power failure occurs, after power resumes, combination operation resume

immediately.

62

• nanoe™ X check mode
o To enable nanoe™ X check mode, during nanoe™ X operation ON:

Normal display mode

Press SW (t ≥ 0 secs)

When SW pressed continuously for t ≥ 5 secs to enter service zone

and press SW’sto choose function 57

Transmit
“NANOE™ X CHECK” code

o During nanoe™ X check mode, H67 is judged when disconnection detected. Timer LED blinks.

• nanoe™ X Abnormal Detection
o Disconnection Abnormality

 Abnormal detection condition

• Start from 1 sec after nanoe™ X power ON, 6 secs has passed and in this 6 secs period, abnormal
signal is detected continuously for 5.9 secs.

 Action after abnormal detection condition fulfilled

• Disconnection counters +1, nanoe™ X power OFF for 5 minutes and then restart. However,
according to action mode and disconnection counter, below will be implemented:
o During nanoe™ X Check Mode: Disconnection abnormality will judged when disconnection

counter ≥ 1. Abnormal code: H67 will memorized in EEPROM, Timer LED blinking and nanoe™
X LED Off.

o Other Than Above: Disconnection abnormality will judged when disconnection counter ≥ 3.

Abnormal code: H67 will memorized in EEPROM and nanoe™ X LED OFF, Timer LED not
blinking.

 Disconnection counters clear condition >

• Disconnection counter will be cleared when operation stop. (Not nanoe™ X Check Mode)

o nanoe™ X Discharge Abnormality

 Abnormal detection condition

• After 30 minutes nanoe™ X power ON, abnormal signal is being detected continuously for 5s.

 Action after abnormal detection condition fulfilled

• Abnormal discharge counter +1, nanoe™ X power OFF for 30 minutes and then restart. When
abnormal discharge counter ≥ 12, abnormal code: H67 in analyze area (Area where abnormal code
not displayed) will be memorized.

 Abnormal discharge counters clear condition

• Discharge counter will be cleared when operation become normal for 50 mins above or when
operations stop.

63

14.12 +8/15°C Heat Operation

• +8/15°C Heat operation provides heating at low setting temperature in unoccupied houses during winter for the

purpose of protecting equipments or housing appliances which may be destroyed by the extreme cold weather.

• This operation can be ON by pressing the +8/15°C heat button on the remote control.

• The temperature settings range are;

o 8.0°C ~ 15.0°C (Pressing TEMP up and TEMP down button at the remote control)

• During the operation of this mode;

o The indoor fan speed will remain at Hi fan tap all the time included deice process.
o Powerful operation, Quiet operation and Fan Speed selection are disabled.
o Cold draft prevention control is disabled.

• Control condition;

#1

(Transmit

+8/15°C HEAT)

(Transmit

+8/15°C HEAT)

Go back to

previo us L CD

setting &

tranmit code

(OR)

(OR)

(Transmit

+8/15°C HEAT)

(OR)

(OR)

(OR)

ON timer

activates

Temperaturerange:

8.0°C ~ 15.0°C

OFF timer activates

ON timer activates

#1

OFF timer activates

(Transmit

+8/15°C HEAT)

Go back to

previous LCD

setting &

tranmit code

Temperature range:

8.0°C ~ 15.0°C

OFF timer activates

(Transmit

+8/15°C HEAT)

Go back to

previous LCD

setting &

tranmit code

Go back to

previo us L CD

setting &

tranmit code

(OR)

(OR)

(OR)

ON timer

activates

(Transmit

+8/15°C HEAT)

NOTE:

#1: Summerhouse set temperaturefollowspreviously fixedset temperature(8.0°C ~ 15.0°C).

But after battery reset, (default condition) set temperaturealways startwith13.0°C.

• Caution!
If the indoor temperature constantly is less than 0°C (Door, windows not close properly), the error code F11 may
occur. This is because in open area, the indoor sensor will misjudge operation condition and will give error code.

64

15. Protection Control

15.1 Protection Control for All Operations

15.1.1 Restart Control (Time Delay Safety Control)

• The Compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on
again by pressing OFF/ON button at remote control within this period.

• This control is not applicable if the power supply is cut off and on again.

• This phenomenon is to balance the pressure inside the refrigerant cycle.

15.1.2 Total Running Current

1 When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor

operation will be decreased.
2 If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
3 However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for

3 minutes.

Model Z25UFEAW-1 Z35UFEAW-1

Operation Mode X (A) Y (A) X (A) Y (A)

Cooling / Soft Dry (A) 5.07

Cooling / Soft Dry (B/C) 4.53 5.61

Heating 6.70 8.15

4 The first 30 minutes of cooling operation, (A) will be applied.

14.66

6.16

14.66

43°C

39°C

Outdoor air temperature

(C)

(B)

(A)

42°C

38°C

15.1.3 IPM (Power transistor) Prevention Control

• Overheating Prevention Control
1 When the IPM temperature rises to 120°C, compressor operation will stop immediately.
2 Compressor operation restarts after 3 minutes the temperature decreases to 110°C.
3 If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).

• DC Peak Current Control
1 When electric current to IPM exceeds set value of 16.0 ± 2.0A, the compressor will stop operate. Then,

operation will restart after 3 minutes.

2 If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will

restart after 1 minute.

3 If the set value exceeded again within 30 seconds after the compressor starts, the operation will restart after

1 minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off, timer
LED will be blinking (“F99” is indicated).

65

15.1.4 Compressor Overheating Prevention Control

• Instructed frequency for compressor operation will be regulated by compressor temperature. The changes of
frequency are as below.

• If compressor temperature exceeds 103°C, compressor will be stopped, occurs 4 times per 20 minutes, timer
LED will be blinking. (“F97” is indicated.)

103°C

99°C

96°C

Comp. temperature

Compressor = OFF

Compressor Frequency

Reduce

Compressor Frequency

Maintain

Free

88°C

87°C

86°C

15.1.5 Low Pressure Prevention Control (Gas Leakage Detection)

• Control start conditions

o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.75A and 0.95A.
o During Cooling and Soft Dry operations:

Indoor suction temperature - indoor piping temperature is below 4°C.

o During Heating operations :

Indoor piping temperature - indoor suction is under 5°C.

• Control contents

o Compressor stops (and restart after 3 minutes).
o If the conditions above happen 2 times within 20 minutes, the unit will:

 Stop operation
 Timer LED blinks and “F91” indicated.

15.1.6 Low Frequency Protection Control 1

• When the compressor operate at frequency lower than 24 Hz continued for 20 minutes, the operation frequency
will be changed to 23 Hz for 2 minutes.

15.1.7 Low Frequency Protection Control 2

• When all the below conditions comply, the compressor frequency will change to lower frequency.

Temperature, T, for: Cooling/Soft Dry Heating

Indoor intake air (°C) T < 14 or T ≥ 30 T < 14 or T ≥ 28

Outdoor air (°C) T < 13 or T ≥ 38 T < 4 or T ≥ 24

Indoor heat exchanger (°C) T < 30 T ≥ 0

66

15.2 Protection Control for Cooling & Soft Dry Operation

15.2.1 Outdoor Air Temperature Control

• The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the
diagram below.

• This control will begin 1 minute after the compressor starts.

• Compressor frequency will adjust base on outdoor air temperature.

• The compressor will be stopped to avoid compressor overloading.

COMP. ON

-15°C

-17°C

COMP. OFF

Outdoor

Air

Temperature

15.2.2 Cooling Overload Control

• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation
frequency).

• The compressor stop if outdoor pipe temperature exceeds 60°C.

• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95 indicated: outdoor high pressure rise

protection).

15.2.3 Freeze Prevention Control 1

• When indoor heat exchanger temperature is lower than 0°C continuously for 6 minutes, compressor will stop
operating.

• Compressor will resume its operation 3 minutes after the indoor heat exchanger is higher than 5°C.

• At the same time, indoor fan speed will be higher than during its normal operation.

• If indoor heat exchanger temperature is higher than 5°C for 5 minutes, the fan speed will return to its normal

operation.

15.2.4 Freeze Prevention Control 2

• Control start conditions

o During Cooling operation and soft dry operation

 During thermo OFF condition, indoor intake temperature is less than 10°C or
 Compressor stops for freeze prevention control

o Either one of the conditions above occurs 5 times in 60 minutes.

• Control contents

o Operation stops
o Timer LED blinks and “H99” indicated

67

15.2.5 Dew Prevention Control 1

• To prevent dew formation at indoor unit discharge area.

• This control will be activated if:

o Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled.
o When Cooling or Dry mode is operated more than 20 minutes or more.

• This control stopped if:

o Compressor stopped.
o Remote control setting changed (fan speed / temperature).
o Outdoor air temperature and indoor intake temperature changed.

• Fan speed will be adjusted accordingly in this control.

15.2.6 Odor Cut Control

• To reduce the odor released from the unit.

o Start Condition

 AUTO FAN Speed is selected during COOL or DRY operation.
 During freeze prevention control and timer preliminary operation, this control is not applicable.

o Control content

 Depends on compressor conditions:

1. Compressor OFF → Compressor ON.

The indoor unit fan stops temporarily and then starts to blow at minimum airflow for 30 seconds.

2. Compressor ON → Compressor OFF.

The indoor unit fan stops for 90 seconds and then blows at minimum airflow for 20 seconds.

15.3 Protection Control for Heating Operation

15.3.1 Intake Air Temperature Control

Compressor will operate at limited freq., if indoor intake air temperature is 30°C or above.

15.3.2 Outdoor Air Temperature Control

• The Max current value is regulated when the outdoor air temperature rise above 14°C in order to avoid
compressor overloading.

15.3.3 Overload Protection Control

• The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown
below.

• If the heat exchanger temperature exceeds 60°C, compressor will stop.

15.3.4 Low Temperature Compressor Oil Return Control

• In heating operation, if the outdoor temperature falls below -10°C when compressor starts, the compressor
frequency will be regulated up to 600 seconds.

68

15.3.5 Cold Draught Prevention Control

• When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced.

15.3.6 Deice Operation

• When outdoor pipe temperature and outdoor air temperature is low, deice operation start where indoor fan motor
and outdoor fan motor stop and DEICE operation On (LED blue).

69

16. Servicing Mode

16.1 Auto OFF/ON Button

Auto OFF/ON
Button pressed

Auto Operation

5 sec 5 sec 5 sec

Test Run Operation

(Forced cooling operation)

Auto OFF/ON
Button pressed

Stop Normal Cooling Operation Stop

Beep x 2 Beep x 3Beep

1 AUTO OPERATION MODE

The Auto operation will be activated immediately once the Auto OFF/ON button is pressed. This operation
can be used to operate air conditioner with limited function if remote control is misplaced or malfunction.

2 TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)

The Test Run operation will be activated if the Auto OFF/ON button is pressed continuously for more than
5 seconds. A “beep” sound will heard at the fifth seconds, in order to identify the starting of Test Run
operation (Forced cooling operation). Within 5 minutes after Forced cooling operation start, the Auto OFF/ON
button is pressed for more than 5 seconds. A 2 “beep” sounds will heard at the fifth seconds, in order to
identify the starting of Normal cooling operation.
Within 5 minutes after Normal cooling operation start, the Auto OFF/ON button is pressed for more than
5 seconds. A 3 “beep” sounds will be heard at the fifth seconds, in order to identify the starting of Forced
heating operation.

The Auto OFF/ON button may be used together with remote control to set / change the advance setting of air
conditioner operation.

Auto OFF/ON button

pressed

Auto Operation

5 sec

Test Run Operation

(Forced Cooling Operation)

Main unit always continue Test Run (forced cooling) operation.

8 sec 11 sec 16 sec

Test Run Operation

(Forced Heating Operation)

Remote Control Number

Auto OFF/ON
Button pressed

Switch Mode

Auto OFF/ON
Button pressed

Test Run Operation

(Forced heating operation)

Remote Control Receiving

Sound OFF/ON

Stop

Press “AC RESET”, then any

3 REMOTE CONTROL NUMBER SWITCH MODE

The Remote Control Number Switch Mode will be activated if the Auto OFF/ON button is pressed
continuously for more than 11 seconds (3 “beep” sounds will occur at 11th seconds to identify the Remote
Control Number Switch Mode is in standby condition) and press “AC RESET” button and then press any
button at remote control to transmit and store the desired transmission code to the EEPROM.

There are 4 types of remote control transmission code could be selected and stored in EEPROM of indoor
unit. The indoor unit will only operate when received signal with same transmission code from remote control.
This could prevent signal interference when there are 2 or more indoor units installed nearby together.
To change remote control transmission code, short or open jumpers at the remote control printed circuit
board.

JB
JA

 During Remote Control Number Switch Mode, press any button at remote control to transmit and store

the transmission code to the EEPROM.

key at remote control

Jumper A (J-A) Jumper B (J-B) Remote Control No.

Short Open A (Default)

Open Open B

Short Short C

Open Short D

Beep x 4Beep x 3Beep Beep x 2

Press “AC RESET”, then any

key at remote control

Remote Control Printed Circuit Board

Press “AC RESET”

at remot e control

70

4 REMOTE CONTROL RECEIVING SOUND OFF/ON MODE

r

The Remote Control Receiving Sound OFF/ON Mode will be activated if the Auto OFF/ON button is pressed
continuously for more than 16 seconds (4 “beep” sounds will occur at 16th seconds to identify the Remote
Control Receiving Sound Off/On Mode is in standby condition) and press “AC Reset” button at remote
control.

Press “Auto OFF/ON button” to toggle remote control receiving sound.

o Short “beep”: Turn OFF remote control receiving sound.
o Long “beep”: Turn ON remote control receiving sound.

After Auto OFF/ON Button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON
Mode is restarted.

16.2 Heat Only Operation

16.2.1 How to Activate/Deactivate Heat only Operation

• Use remote controller to set heating only operation. When the unit in standby mode, follow the steps below:

a) Press continuously for more than 5 seconds to enter special setting mode.

b) Press to choose function 61, and then press or to set “01”. (To enable the “Heat Only” mode)

or “00” (To disable the “Heat Only” mode).

c) Press to activate “Heating only operation” or deactivate “Heating only operation”.

SET

T 5secs

(Function

no.)

(Options)

Activate or deactivate
“Heating only
operation”

Special setting mode

16.2.2 Operation mode during Heating Only Operation

• The table below shows the operation mode comparison when Heating Only Operation Mode Activated and
Deactivated.

Operation Mode Heating Only Operation Mode Activated Heating Only Operation Mode Deactivated

AUTO

HEAT The unit will run Heating operation. The unit will run Heating operation.

COOL The unit will stop and Power LED blinking. The unit will run Cooling operation.

DRY The unit will stop and Power LED blinking. The unit will run Cooling Dry operation.

NANOE Stand-alone The unit will stop and Power LED blinking. The unit will run Nanoe Stand-alone operation.

Force Cooling

Force Heating The unit will run Force Heating operation. The unit will run Force Heating operation.

AUTO (with Timer)

HEAT (with Timer)

COOL (with Timer)

DRY (with Timer)

Cooling Test Mode The unit will stop and Power LED blinking.

Heating Test Mode

After 30s sampling, regardless of the indoor intake or
outdoor intake temperature judgment, the unit will run
Heating operation.

The unit will run Force Cooling Operation for
X_CTRYTM [15] minutes

The unit will turn ON by the timer and run Auto
Operation. After 30s sampling, regardless of the
indoor intake or outdoor intake temperature judgment,
the unit will run Heating operation.

The unit will turn ON by the timer and run Heating
Operation.

The unit will not turn ON by the timer. Power LED
blinking.

The unit will not turn ON by the timer. Power LED
blinking.

The unit will operate according to specify Heating test
mode operation parameter.

After 30s sampling, the unit will judge the operation
mode base on remote controller temperature setting
and Indoor Intake Sensor (New Auto Mode) or
Outdoo

The unit will run Force Cooling operation.

The unit will turn ON by the timer and run Auto
Operation. After 30s sampling, the unit will judge the
operation mode base on remote controller
temperature setting and Indoor Intake Sensor (New
Auto Mode) or Outdoor Intake Sensor (Old Auto
Mode).

The unit will turn ON by the timer and run Heating
Operation.

The unit will turn ON by the timer and run Cooling
Operation.

The unit will turn ON by the timer and run Cooling Dry
Operation.

The unit will operate according to specify Cooling test
mode operation parameter.

The unit will operate according to specify Heating test
mode operation parameter.

Intake Sensor (Old Auto Mode).

71

16.3 Remote Control Button

16.3.1 SET Button

• To check remote control transmission code and store the transmission code to EEPROM:

o Press “Set” button by using pointer.
o Press “Timer Set” button until a “beep” sound is heard as confirmation of transmission code changed.

• To limit set temperature range for COOL & DRY, HEAT mode.

o Press “Set” button by using pointer.
o Press TEMP increment or decrement button to choose No. 3.
o Press Timer increment or decrement button to select desired temperature low limit of set temperature for

COOL & DRY mode.

o Press Timer Set button to confirm low limit selection.
o Press TEMP increment or decrement button to choose No. 4.
o Press Timer decrement or increment button to select desired temperature high limit of set temperature for

COOL & DRY mode.

o Press Timer Set button to confirm high limit selection.
o Press TEMP increment or decrement button to choose No. 5.
o Press Timer increment or decrement button to select desired temperature low limit of set temperature for

HEAT mode.

o Press Timer Set button to confirm low limit selection.
o Press TEMP increment or decrement button to choose No. 6.
o Press Timer decrement or increment button to select desired temperature high limit of set temperature for

HEAT mode.

o Press Timer Set button to confirm high limit selection.
o LCD returns to original display if remote control does not operate for 30 seconds or press Timer Cancel

button.

• New Deice Judgement Selection

Normal display mode

Press SW (t ≥ 0secs)

When

& press SW’s to choose function 60

SW pressed continuously for t ≥ 5secs to enter service zone

Switching
= No

Switching
= Yes

Transmit

“No or Yes” code

Note:
By default is New Deice Judgement.

72

16.3.2 RESET (RC)

• To clear and restore the remote control setting to factory default.

o Press once to clear the memory.

16.3.3 RESET (AC)

• To restore the unit’s setting to factory default.

o Press once to restore the unit’s setting.

16.3.4 TIMER ▲

• To change indoor unit indicator’s LED intensity.

o Press continuously for 5 seconds.

16.3.5 TIMER ▼

• To change remote control display from Degree Celsius (°C) to Degree Fahrenheit (°F).

o Press continuously for 10 seconds.

16.3.6 Special Setting mode

1 LCD display area:

Special setting display area

(highlighted in color)

2 Cannot enter this special setting mode under the following conditions:

1 Operation ON.
2 Under [Real/ON/OFF] time setting mode.

3 To enter zone 1 area:

Normal display

mode

Enter Zone1

[range (1~49)]

Function

No.

Options

(If any)

73

4 To enter zone 2 area: (Press continuously for T ≥ 5 secs)

–

Once T ≥ 5secs

mode

5 Function & Options list:

Zone 1

No Name

1 Remote control number selection A, B, C, D

[iAUTO-X/iAUTO/iCOMF, Cool & Dry] mode set temperature [Low2]

3

selection

[iAUTO-X/iAUTO/iCOMF, Cool & Dry] mode set temperature [High2]

4

selection

5 Heat mode set temperature Low1 selection 16°C ~ [High1]

6 Heat mode set temperature High1 selection [Low1] ~ 30°C

10 Auto restart disable/enable selection 00 / 01

53 DOA check None (No display)

54 Odor cut control selection [Enable (01) / Disable (00)] 00 / 01

Fixed fan speed selection during heat mode compressor OFF [Enable

56

(01) / Disable (00)]

57 nanoe™ X check None (No display)

58 Heat mode thermo shift adjustment -3°C ~ 3°C

59 Others (Cool & Dry) mode thermo shift adjustment -3°C ~ 3°C

Zone 2

Deice start determination judgment temperature switching [Yes (01) /

60

No (00)]

61 Cool mode disable selection [Yes (01) / No (00)] 00/01

63 Base pan heater selection [Base pan A (A) / Base pan B (b)] A / b

Disable fan speed reduction during cool mode thermo-Off [Yes (01) /

64

No (00)]

69 Up/Down air swing upper limit restriction selection

70 Failure diagnosis mode disable None (No display)

Function

Enter Zone1Normal display

Options Remark

16°C ~ [High2]

[Low2] ~ 30°C

00/01

00/01

00/01

00 – Disable

Enable

01

Enter Zone2

[range (50~99)]

74

17. Troubleshooting Guide

17.1 Refrigeration Cycle System

In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the refrigeration
cycle depends on various conditions, the standard values for them
are shown in the table on the right.

Normal Pressure and Outlet Air Temperature (Standard)

Cooling Mode 0.9 ~ 1.2 (9 ~ 12) 13 ~ 17

Heating Mode 2.0 ~ 2.7 (20 ~ 27) 32 ~ 42

*Condition: • Indoor fan speed = High

mode and 7°C at the heating mode

• Compressor operates at rated frequency

Gas Pressure

MPa

2

G)

(kg/cm

• Outdoor temperature 35°C at the cooling

Outlet air

Temperature

(°C)

Difference in the intake

and outlet

air temperatures

Less than 8°C at the cooling mode
Less than 14°C at the heating mode.

Value of electric

current during operation

Lower than specified

More than 8°C

(15 minutes after an

operation is started.)

at cooling mode.

Above 14°C

(15 minutes after an

operation is started.)

at heating mode.

Higher than specified

Normal

Dusty condenser

preventing heat radiation

Excessive amount

of refrigerant

•

Outlet air
temperature

Intake air
temperature

•

Measuring the air temperature
difference

Discharge air

Measuring electric current
during operation

Gas side
pressure

Cooling Mode High

Low

Low

Low

Heating Mode

Low

High

Inefficient compressor

Insufficient refrigerant

Clogged strainer or

capillary tube

Inefficient compressor

Insufficient refrigerant

Clogged strainer, capillary

tube or expansion valve

Measuring gas side pressure

•

75

17.1.1 Relationship Between the Condition of the Air Conditioner and Pressure and
Electric Current

Condition of the

air conditioner

Insufficient refrigerant

(gas leakage)

Clogged capillary tube or

Strainer

Low Pressure High Pressure

     

     

Cooling Mode Heating Mode

Electric current

during operation

Low Pressure High Pressure

Electric current

during operation

Short circuit in the indoor unit

Heat radiation deficiency

of the outdoor unit

Inefficient compression

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

     

     

     

76

17.2 Breakdown Self Diagnosis Function

n

17.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)

• Once abnormality has occurred during operation,
the unit will stop its operation, and Timer LED
blinks.

• Although Timer LED goes off when power supply
is turned off, if the unit is operated under a
breakdown condition, the LED will light up again.

• In operation after breakdown repair, the Timer
LED will no more blink. The last error code
(abnormality) will be stored in IC memory.

17.2.2 To Make a Diagnosis

1 Timer LED start to blink and the unit

automatically stops the operation.

2 Press the CHECK button on the remote

controller continuously for 5 seconds.

3 “- -” will be displayed on the remote controller

display.
Note: Display only for “- -”. (No transmitting
signal, no receiving sound and no Power LED
blinking.)

4 Press the “TIMER” ▲ or ▼ button on the

remote controller. The code “H00” (no
abnormality) will be displayed and signal will
be transmitted to the main unit.

5 Every press of the button (up or down) will

increase abnormality numbers and transmit
abnormality code signal to the main unit.

6 When the latest abnormality code on the main

unit and code transmitted from the remote
controller are matched, power LED will light
up for 30 seconds and a beep sound
(continuously for 4 seconds) will be heard. If
no codes are matched, power LED will light up
for 0.5 seconds and no sound will be heard.

7 The breakdown diagnosis mode will be

canceled unless pressing the CHECK button
continuously for 5 seconds or operating the
unit for 30 seconds.

8 The LED will be off if the unit is turned off or

the RESET button on the main unit is pressed.

17.2.3 To Display Memorized Error

Code (Protective Operation)

1 Turn power on.
2 Press the CHECK button on the remote

controller continuously for 5 seconds.

3 “- -” will be displayed on the remote controller

display.
Note: Display only for “- -”. (No transmitting
signal, no receiving sound and no Power LED
blinking.)

4 Press the “TIMER” ▲ or ▼ button on the

remote controller. The code “H00” (no
abnormality) will be displayed and signal will
be transmitted to the main unit. The power
LED lights up. If no abnormality is stored in
the memory, three beeps sound will be heard.

5 Every press of the button (up or down) will

increase abnormality numbers and transmit
abnormality code signal to the main unit.

6 When the latest abnormality code on the main

unit and code transmitted from the remote
controller are matched, power LED will light
up for 30 seconds and a beep sound
(continuously for 4 seconds) will be heard. If
no codes are matched, power LED will light up
for 0.5 seconds and no sound will be heard.

7 The breakdown diagnosis mode will be

canceled unless pressing the CHECK button
continuously for 5 seconds or operating the
unit for 30 seconds.

8 The same diagnosis can be repeated by

turning power on again.

“Check” butto

17.2.4 To Clear Memorized Error Code
after Repair (Protective
Operation)

1 Turn power on (in standby condition).
2 Press the AUTO button for 5 seconds (A beep

receiving sound) on the main unit to operate
the unit at Forced Cooling Operation modes.

3 Press the CHECK button on the remote

controller for about 1 second with a pointed
object to transmit signal to main unit. A beep
sound is heard from main unit and the data is
cleared.

17.2.5 Temporary Operation (Depending
On Breakdown Status)

1 Press the AUTO button (A beep receiving

sound) on the main unit to operate the unit.
(Remote control will become possible.)

2 The unit can temporarily be used until

repaired.

77

17.3 Error Codes Table

r

r

Diagnosis

display

H00 No memory of failure — Normal operation — —

H11

H12

H14

H15

H16

H19

H23

H24

H25

H27

H28

H30

H32

H33

H34

H36

H37

H38

H39

Abnormality /

Protection control

Indoor/outdoor
abnormal
communication

Indoor unit capacity
unmatched

Indoor intake air
temperature sensor
abnormality
Compressor
temperature sensor
abnormality
Outdoor current
transformer (CT)
abnormality

Indoor fan motor
merchanism lock

Indoor heat
exchanger
temperature sensor
abnormality
Indoor heat
exchanger
temperature sensor
2 abnormality
Indoor ion device
abnormality
Outdoor air
temperature sensor
abnormality
Outdoor heat
exchanger
temperature sensor
1 abnormality
Outdoor discharge
pipe temperature
sensor abnormality
Outdoor heat
exchanger
temperature sensor
2 abnormality
Indoor / outdoor
misconnection
abnormality
Outdoor heat sink
temperature sensor
abnormality
Outdoor gas pipe
temperature sensor
abnormality
Outdoor liquid pipe
temperature sensor
abnormality
Indoor/Outdoor
mismatch (brand
code)

Abnormal indoor
operating unit or
standby units

Abnormality

Judgment

After operation for
1 minute

90s after power
supply

Continuous for 5s —

Continuous for 5s —

— —

Continuous
happen for 7 times

Continuous for 5s —

Continuous for 5s —

Port is ON for 10s
during ion device off

Continuous for 5s —

Continuous for 5s —

Continuous for 5s —

Continuous for 5s —

— —

Continuous for 2s —

Continuous for 5s

Continuous for 5s

— — Brand code not match

3 times happen
within 40 minutes

Protection

Operation

Indoor fan only
operation can
start by entering
into force cooling
operation

—

—

— —

Heating
protection
operation only
Cooling
protection
operation only

—

Problem Check location

Indoor/outdoor
communication not
establish

Total indoor capability
more than maximum limit
or less than minimum limit,
or number of indoor unit
less than two
Indoor intake air
temperature sensor open
or short circuit

Compressor temperature
sensor open or short circuit

Current transformer faulty
or compressor faulty

Indoor fan motor lock or
feedback abnormal

Indoor heat exchanger
temperature sensor open
or short circuit

Indoor heat exchanger
temperature sensor 2 open
or short circuit

Outdoor air temperature
sensor open or short circuit

Outdoor heat exchanger
temperature sensor 1 open
or short circuit

Outdoor discharge pipe
temperature sensor open
or short circuit

Outdoor heat exchanger
temperature sensor 2 open
or short circuit

Indoor and outdoor rated
voltage different

Outdoor heat sink
temperature sensor open
or short circuit
Outdoor gas pipe
temperature sensor open
or short circuit
Outdoor liquid pipe
temperature sensor open
or short circuit

Wrong wiring and
connecting pipe, expansion
valve abnormality, indoor
heat exchanger sensor
open circuit

• Indoor/outdoor wire terminal

• Indoor/outdoor PCB

• Indoor/outdoor connection wire

• Indoor/outdoor connection wire

• Indoor/outdoor PCB

• Specification and combination

table in catalogue

• Indoor intake air temperature
sensor lead wire and connector

• Compressor temperature
sensor lead wire and connector

• Outdoor PCB faulty or
compressor faulty

• Fan motor lead wire and
connector

• Fan motor lock or block

• Indoor heat exchanger

temperature sensor lead wire
and connector

• Indoor heat exchanger
temperature sensor 2 lead wire
and connector

• ion device PCB

• Outdoor air temperature sensor

lead wire and connector

• Outdoor heat exchanger
temperature sensor 1 lead wire
and connector

• Outdoor discharge pipe
temperature sensor lead wire
and connecto

• Outdoor heat exchanger
temperature sensor 2 lead wire
and connector

• Indoor and outdoor units check

• Outdoor heat sink sensor

• Outdoor gas pipe temperature

sensor lead wire and connector

• Outdoor liquid pipe temperature
sensor lead wire and connector

• Check indoor unit and outdoor
unit

• Check indoor/outdoor
connection wire and connection
pipe

• Indoor heat exchanger sensor
lead wire and connector

• Expansion valve and lead wire
and connecto

78

Diagnosis

r

r

display

H41

H59

H64

H67 Nanoe abnormality

H70

H97

H98

H99

F11

F17

F90

F91

F93

F94

F95

F96

F97

F98

F99

Abnormality /

Protection control

Abnormal wiring or
piping connection

ECONAVI sensor
abnormality

Outdoor high
pressure sensor
abnormality

Light sensor
abnormality

Outdoor fan motor
mechanism lock

Indoor high pressure
protection

Indoor operating unit
freeze protection

4-way valve
switching
abnormality

Indoor standby units
freezing abnormality

Power factor
correction
(PFC) circuit
protection
Refrigeration cycle
abnormality

Compressor
abnormal revolution
Compressor
discharge overshoot
protection

Outdoor cooling high
pressure protection

Power transistor
module overheating
protection
Compressor
overheating
protection

Total running current
protection

Outdoor direct
current (DC) peak
detection

Abnormality

Judgment

— —

Continuous for 25s —

Continuous for 1
minutes

Nanoe stop for 5
minutes for 3 times

Continuous for 24
hours, 15 days

2 times happen
within 30 minutes

— —

— —

4 times happen
within 30 minutes

3 times happen
within 40 minutes

4 times happen
within 10 minutes

2 times happen
within 20 minutes

4 times happen
within 20 minutes

4 times happen
within 30 minutes

4 times happen
within 20 minutes

4 times happen
within 30 minutes

3 times happen
within 30 minutes

3 times happen
within 20 minutes

Continuous
happen for 7 times

Protection

Operation

—

— Nanoe faulty

—

—

—

—

—

—

—

—

—

—

— Compressor overheat

— Total current protection

—

Problem Check location

Wrong wiring and
connecting pipe, expansion
valve abnormality

ECONAVI sensor open or
short circuit

High pressure sensor open
circuit during compressor
stop

Light sensor open or short
circuit

Outdoor fan motor lock or
feedback abnormal

Indoor high pressure
protection (Heating)

Indoor freeze protection
(Cooling)

4-way valve switching
abnormal

Wrong wiring and
connecting pipe, expansion
valve leakage, indoor heat
exchanger sensor open
circuit

Power factor correction
circuit abnormal

Refrigeration cycle
abnormal

Compressor abnormal

Compressor discharge
pressure overshoot

Cooling high pressure
protection

Power transistor module
overheat

Power transistor module
current protection

• Check indoor/outdoor
connection wire and connection
pipe

• Expansion valve and lead wire
and connecto

• ECONAVI sensor (defective or
disconnected)

• ECONAVI PCB

• High pressure sensor

• Lead wire and connector

• PCB

• Nanoe system

• High voltage

• Light sensor (defective or

disconnect)

• Outdoor fan motor lead wire
and connector

• Fan motor lock or block

• Check indoor heat exchanger

• Air filter dirty

• Air circulation short circuit

• Check indoor heat exchanger

• Air filter dirty

• Air circulation short circuit

• 4-way valve

• Lead wire and connector

• Check indoor/outdoor

connection wire and pipe

• Indoor heat exchanger sensor
lead wire and connector

• Expansion valve lead wire and
connecto

• Outdoor PCB faulty

• Insufficient refrigerant or valve

close

• Power transistor module faulty
or compressor lock

• Check refrigeration system

• Check refrigeration system

• Outdoor air circuit

• PCB faulty

• Outdoor air circuit (fan motor)

• Insufficient refrigerant

• Check refrigeration system

• Power source or compressor

lock

• Power transistor module faulty
or compressor lock

79

17.4 Self-diagnosis Method

17.4.1 H11 (Indoor/Outdoor Abnormal Communication)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal
transmission is checked whether it is normal.

Malfunction Caused

• Faulty indoor unit PCB.

• Faulty outdoor unit PCB.

• Indoor unit-outdoor unit signal transmission error due to wiring error.

• Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between the

indoor and outdoor units.

Troubleshooting

When abnormality indication starts again

For safety reason and to prevent

Measure the AC voltage at terminal 1 & 2 of outdoor unit

Caution

terminal board

component breakdown, always switch
off the power before remove and
connect the component.

Is the measured voltage 230/240V?

YES

Measure the DC voltage at terminal 2 & 3 (communication
terminals) of outdoor unit terminal board

Is the measured DC voltage fluctuate between 10~70V?
(Value depend on multimeter accuracy)

YES

Measure the AC voltage at terminal 1 & 2 of indoor unit
terminal board

Is the measured voltage 230/240V?

YES

Measure the DC voltage at terminal 2 & 3 of indoor unit
terminal board

Is the measured DC voltage fluctuate between 10~70V?

NO

NO

NO

NO

● AC power supply abnormal fluctuation

● Defect in communication circuitry
of outdoor unit PCB

● Replace the PCB

●

Improper connection at terminals
indoor/outdoor

●

Check indoor/outdoor connecting cable

●

Improper connection at terminals
indoor/outdoor

●

Check indoor/outdoor connecting cable

●

YES

Defect in receiver/transmitter module of
the communication circuitry in indoor
unit PCB

●

Replace the indoor unit PCB

80

17.4.2 H12 (Indoor/Outdoor Capacity Rank Mismatched)

Malfunction Decision Conditions

• During startup, error code appears when different types of indoor and outdoor units are interconnected.

Malfunction Caused

• Wrong models interconnected.

• Wrong indoor unit or outdoor unit PCBs mounted.

• Indoor unit or outdoor unit PCBs defective.

• Indoor-outdoor unit signal transmission error due to wrong wiring.

• Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoor

and outdoor units.

Troubleshooting

81

17.4.3 H14 (Indoor Intake Air Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the indoor intake air
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

82

17.4.4 H15 (Compressor Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

83

17.4.5 H16 (Outdoor Current Transformer)

Malfunction Decision Conditions

• An input current, detected by Current Transformer CT, is below threshold value when the compressor is
operating at certain frequency value for 3 minutes.

Malfunction Caused

• Lack of gas

• Broken CT (current transformer)

• Broken Outdoor PCB

Troubleshooting

84

17.4.6 H19 (Indoor Fan Motor – DC Motor Mechanism Locked)

Malfunction Decision Conditions

• The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor
(feedback of rotation > 2550 rpm or < 50 rpm)

Malfunction Caused

• Operation stops due to short circuit inside the fan motor winding.

• Operation stops due to breaking of wire inside the fan motor.

• Operation stops due to breaking of fan motor lead wires.

• Operation stops due to Hall IC malfunction.

• Operation error due to faulty indoor unit PCB.

Troubleshooting

85

17.4.7 H23 (Indoor Pipe Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

86

17.4.8 H24 (Indoor Pipe Temperature Sensor 2 Abnormality)

Resis

a

n

c

Temperatu

re°C(°F

)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger
temperature sensor 2 are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

When abnormality indication starts again.

Check the connector connection:

Plug out connector from the indoor unit PCB.
Measure the resistance of the indoor pipe temperature
sensor.

Is the connector connection normal?

Check the outdoor air temperature sensor:

Plug out connector from the outdoor unit PCB.
Measure the resistance of the outdoor intake air
temperature sensor.

Is the measured resistance of the outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?

Sensor (Thermistor)

70

60

50

40

e(kΩ)

30

t

20

Characteristics

1 Pipe temp. Sensor
2 Intake Air Temp. Sensor

1

2

YES

YES

NO

NO

For safety reason and to prevent component

Caution

breakdown, always switch off the power
before remove and connect the component.

Connector poor contact.
Correct the connection.

Defect in outdoor intake air temperature sensor.
Replace the outdoor intake air temperature
sensor.

Defect in outdoor unit PCB.
Replace the outdoor unit PCB.

10

0

-10

(14)0(32)10(50)20(68)30(86)40(104)50(122)

87

17.4.9 H27 (Outdoor Air Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature
sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

88

17.4.10 H28 (Outdoor Pipe Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature
sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

89

17.4.11 H30 (Compressor Discharge Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

90

17.4.12 H32 (Outdoor Heat Exchanger Temperature Sensor 2 Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor heat exchanger
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

91

17.4.13 H33 (Unspecified Voltage between Indoor and Outdoor)

Malfunction Decision Conditions

• The supply power is detected for its requirement by the indoor/outdoor transmission.

Malfunction Caused

• Wrong models interconnected.

• Wrong indoor unit and outdoor unit PCBs used.

• Indoor unit or outdoor unit PCB defective.

Troubleshooting

92

17.4.14 H34 (Outdoor Heat Sink Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor heat sink
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

93

17.4.15 H36 (Outdoor Gas Pipe Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor gas pipe
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

94

17.4.16 H37 (Outdoor Liquid Pipe Temperature Sensor Abnormality)

Malfunction Decision Conditions

• During startup and operation of cooling and heating, the temperatures detected by the outdoor liquid pipe
temperature sensor are used to determine sensor errors.

Malfunction Caused

• Faulty connector connection.

• Faulty sensor.

• Faulty PCB.

Troubleshooting

95

17.4.17 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked)

(

)

V

W

Malfunction Decision Conditions

• The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor.

Malfunction Caused

• Operation stops due to short circuit inside the fan motor winding.

• Operation stops due to breaking of wire inside the fan motor.

• Operation stops due to breaking of fan motor lead wires.

• Operation stops due to Hall IC malfunction.

• Operation error due to faulty outdoor unit PCB.

Troubleshooting

When abnormality indication starts again

1

3
5

CN-MTR2

WHT

CN-MTR1

1

2

3
4

5

W

U
V

IC19

R111

R120

1k

5V

C173

C175

0.01μ
50V

+

G5 G5 G5

PCB BOARD

1k

10

14
16

R105

1k

C177 C176

0.01μ
50V

0.01μ
50V

G5

Turn off power supply and rotate fan by
hand.

Does fan rotate smoothly?

YES

Turn power supply on and operate fan.

FAN MOTOR

MS

Caution

NO

For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.

Replace fan motor.

Turn off power supply and
disconnect
connector.

fan motor CN-MRT2

Does it rotate?

YES

Stop the fan motor

Check the rotation feedback output from

motor’s CN-MTR1 output.

fan
Rotate

the fan motor manually (by hand)

while

measure the voltage at PCB’s

CN-MRT1

- Between

- Between

- Between

1(+) and 5(-)
2(+) and 5(-)
3(+) and 5(-)

NO

Check resistance of the motor.

at

Measure
CN-MRT1

Is the resistance normal?

Use
the
Connect
Turn

Do
OFF

Does
becomes

fan motor connector

(1-2, 1-3, 2-3).

YES

an

inverter check to check on

power transistor on board.

it to

PCB’s CN-MRT2 port.

power ON and run the unit.

all 6 LED light turn ON and turn

periodically?

the voltage at each terminal

5

and 0Vdc repeatedly?

U

NO

Replace fan motor.

NO

Replace outdoor PCB.

YES

Replace fan motor.

NO

Replace fan motor.

YES

Replace outdoor PCB.

96

17.4.18 H98 (Error Code Stored in Memory and no alarm is triggered / no TIMER LED
flashing)

Malfunction Decision Conditions

• Indoor high pressure is detected when indoor heat exchanger is detecting very high temperature when the unit is

operating in heating operation.

• Phenomena: unit is stopping and re-starting very often in heating mode

Malfunction Caused

• Indoor heat exchanger thermistor

• Clogged air filter or heat exchanger

• Over-bent pipe (liquid side)

Troubleshooting

97

17.4.19 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)

Error Code will not display (no Timer LED blinking) but store in EEPROM

Malfunction Decision Conditions

• Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C)

Malfunction Caused

• Air short circuit at indoor unit

• Clogged indoor unit air filter

• Dust accumulation on the indoor unit heat exchanger

• 2/3 way valve closed

• Faulty indoor unit fan motor

• Refrigerant shortage (refrigerant leakage)

• Clogged expansion valve or strainer

• Faulty indoor pipe temperature sensor

• Faulty indoor unit PCB

Troubleshooting

98

17.4.20 F11 (4-way Valve Switching Failure)

Malfunction Decision Conditions

• When indoor heat exchanger is cold during heating (except deice) or when indoor heat exchanger is hot during

cooling and compressor operating, the 4-way valve is detected as malfunction.

Malfunction Caused

• Indoor heat exchanger (pipe) thermistor

• 4-way valve malfunction

Troubleshooting

* Check gas side pipe – for hot gas flow in cooling mode

99

17.4.21 F17 (Indoor Standby Units Freezing Abnormality)

Malfunction Decision Conditions

• When the different between indoor intake air temperature and indoor pipe temperature is above 10°C or indoor
pipe temperature is below -1.0°C.

Remark:
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor
unit and H39 to other indoor unit(s).

Malfunction Caused

• Wrong wiring connection

• Faulty sensor

• Faulty expansion valve

Troubleshooting

100