Mitsubishi MXZ-2HA50VF, MXZ-2HA40VF, MXZ-3HA50VF User guide

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OUTDOOR UNIT

SERVICE MANUAL

Models

MXZ-2HA40VF MXZ-2HA50VF MXZ-3HA50VF

ET1

E1, ET1

HFC

utilized

R32

Indoor unit service manual MSZ-HR•VF Series (OBH822)

No. OBH828

MXZ-2HA40VF MXZ-2HA50VF

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. SAFETY PRECAUTION ···································· 3

3. PART NAMES AND FUNCTIONS ··················· 13

4. SPECIFICATION ·············································· 14

5. NOISE CRITERIA CURVES ···························· 17

6. OUTLINES AND DIMENSIONS ······················ 18

7. WIRING DIAGRAM ·········································· 20

8. REFRIGERANT SYSTEM DIAGRAM ············· 24

9. PERFORMANCE CURVES ····························· 27

10. ACTUATOR CONTROL ··································· 36

11. SERVICE FUNCTIONS ···································· 37

12. TROUBLESHOOTING ····································· 41

13. DISASSEMBLY INSTRUCTIONS ···················· 66

PARTS CATALOG (OBB828)

Use the specied refrigerant only

OBH828

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

Prepare the proper tools. Prepare the proper protectors. Provide adequate ventilation. After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug. Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands. Do not pour water into the electric parts. Do not touch the refrigerant. Do not touch the hot or cold areas in the refrigeration cycle. When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

OBH828

MXZ-2HA40VF -

TECHNICAL CHANGES

MXZ-2HA50VF -E1, MXZ-3HA50VF -E1,

1. New model

ET1

SAFETY PRECAUTION

MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT

WARNING

Read the OPERATION MANUAL carefully before operation.

Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation.

Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.

This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit.

2-1. ALWAYS OBSERVE FOR SAFETY

Before obtaining access to terminal, all supply circuits must be disconnected.

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R32

Preparation before the repair service.

• Prepare the proper tools.

• Prepare the proper protectors.

• Provide adequate ventilation.

• After stopping the operation of the air conditioner, turn off the power-supply breaker.

• Discharge the condenser before the work involving the electric parts.

Use new refrigerant pipes.

In case of using the existing pipes for R22, be careful with the following.

· Be sure to clean the pipes and make sure that the insides of the pipes are clean.

· Change flare nut to the one provided with this product. Use a newly flared pipe.

· Avoid using thin pipes.

Precautions during the repair service.

• Do not perform the work involving the electric parts with wet hands.

• Do not pour water into the electric parts.

• Do not touch the refrigerant.

• Do not touch the hot or cold areas in the refrigerating cycle.

• When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution

not to touch the live parts.

Use a vacuum pump with a reverse flow check valve.

Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc.

Make sure that the inside and outside of refrige-

OBH828

rant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, which are hazard to refrigerant cycle. In addition, use pipes with specified thickness.

Contamination inside refrigerant piping can cause deterioration of refrigerant oil, etc.

Use the following tools specifically designed for use with R32 refrigerant.

The following tools are necessary to use R32 refrigerant.

Tools for R32 Gauge manifold Charge hose Gas leak detector

Torque wrench

Flare tool Size adjustment gauge Vacuum pump adaptor

Electronic refrigerant charging scale

Store the piping indoors, and both ends of the piping sealed until just before brazing. (Leave elbow joints, etc. in their packaging.)

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor.

The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a small amount.

If large amount of mineral oil enters, that can cause deterioration of refrigerant oil, etc.

Do not use refrigerant other than R32.

If other refrigerant (R22, etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil, etc.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor.

Use the specified refrigerant only.

Never use any refrigerant other than that specified.

Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, poisonous gases will be released.

[1] Warning for service

OBH828

(1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components

specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit. For appliances not accessible to the general public. (4) Refrigerant pipes connection shall be accessible for maintenance purposes. (5)

If the air conditioner is installed in a small room or closed room, measures must be taken to prevent the refrigerant concentra-

tion in the room from exceeding the safety limit in the event of refrigerant leakage. Should the refrigerant leak and cause the

concentration limit to be exceeded, hazards due to lack of oxygen in the room may result. (6) Keep gas-burning appliances, electric heaters, and other fire sources (ignition sources) away from the location where

installation, repair, and other air conditioner work will be performed. If refrigerant comes into contact with a flame, poisonous gases will be released. (7) When installing or relocating, or servicing the air conditioner, use only the specified refrigerant (R32) to charge the refrig-

erant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines. If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may

result in an explosion and other hazards. (8) After installation has been completed, check for refrigerant leaks. If refrigerant leaks into the room and comes into contact

with the flame of a heater or portable cooking range, poisonous gases will be released. (9) Do not use low temperature solder alloy in case of brazing the refrigerant pipes. (10)

When performing brazing work, be sure to ventilate the room sufficiently. Make sure that there are no hazardous or flam-

mable materials nearby. When performing the work in a closed room, small room, or similar location, make sure that there are no refrigerant leaks

before performing the work. If refrigerant leaks and accumulates, it may ignite or poisonous gases may be released. (11) Do not install the unit in places where refrigerant may build-up or places with poor ventilation such as a semi-basement or a

sunken place in outdoor: Refrigerant is heavier than air, and inclined to fall away from the leak source. (12)

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

(13)

The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an

operating gas appliance or an operating electric heater). (14)

Do not pierce or burn.

(15)

Be aware that refrigerants may not contain an odour.

(16)

Pipe-work shall be protected from physical damage.

(17)

The installation of pipe-work shall be kept to a minimum.

(18)

Compliance with national gas regulations shall be observed.

(19)

Keep any required ventilation openings clear of obstruction.

(20)

Servicing shall be performed only as recommended by the manufacturer.

(21)

The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified

for operation. (22) Maintenance, service and repair operations shall be performed by authorized technician with required qualification. (23)

Be sure to have appropriate ventilation in order to prevent ignition. Furthermore, be sure to carry out fire prevention

measures that there are no dangerous or flammable objects in the surrounding area.

[2] Cautions for service

(1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously.

Be sure to use a filter drier for new refrigerant.

[3] Additional refrigerant charge

When charging directly from cylinder

R32 is a single refrigerant and its composition does not change. Therefore, both liquid charging and gas charging are

possible. Liquid charging of refrigerant all at once from the low-pressure side may cause the compressor malfunction.

Accordingly, make sure that charging is gradual.

< Cylinder with a siphon tube >

Cylinder

Charging gas refrigerant

Valve

Liquid

Charging liquid refrigerant

< Cylinder without a siphon tube >

Cylinder

Liquid

Valve

[4] Cautions for unit using R32 refrigerant

OBH828

Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful

attention to the following points.

(1) Information on servicing (1-1) Checks on the Area

Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized. For repair to the refrigerating systems, (1-3) to (1-7) shall be completed prior to conducting work on the systems.

(1-2) Work Procedure

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.

(1-3) General Work Area

All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out. Work in confined spaces shall be avoided. The area around the workspace shall be sectioned off. Ensure that the conditions within the area have been made safe by control of flammable material.

(1-4) 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 toxic or flammable atmospheres. Ensure that the leak detection equipment being used is suitable for use with all applicable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe.

(1-5) 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 to hand. Have a dry powder or CO2 fire extinguisher adjacent to the charging area.

(1-6) No Ignition Sources

No person carrying out work in relation to a refrigeration system which involves exposing any pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which 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.

(1-7) 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.

(1-8) Checks on 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:

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.

• 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 suitably protected against being corroded.

(1-9) Checks on Electrical Devices

Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. 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. This shall be reported to the owner of the equipment so all parties are advised. Initial safety checks shall include that:

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

• no live electrical components and wiring are exposed while charging, recovering or purging the system;

• there is continuity of earth bonding

•

(2) Repairs to Sealed Components (2-1) 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.

(2-2) 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 the apparatus is mounted securely. Ensure that seals or sealing materials have not degraded to the point 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.

(3) Repair to intrinsically Safe Components

OBH828

Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible 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. Other parts may result in the ignition of refrigerant in the atmosphere from a leak.

(4) 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.

(5) Detection of Flammable Refrigerants

Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used.

(6) Leak Detection Methods

Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, 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 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. For appliances containing flammable refrigerants, oxygen free nitrogen (OFN) shall then be purged through the system both before and during the brazing process.

(7) Removal and Evacuation

When breaking into the refrigerant circuit to make repairs – or for any other purpose conventional procedures shall be used. However, for flammable refrigerants 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. For appliances containing flammable refrigerants, 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 purging refrigerant systems. For appliances containing flammable refrigerants, 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 that ventilation is available.

(8) 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 overfill the refrigeration system.

• Prior to recharging

tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the site.

(9) Decommissioning

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

the system, it shall be pressure-tested with the appropriate purging gas. The system shall be leak-

b) Isolate system electrically.

OBH828

Before attempting the procedure, ensure that:

• 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. e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system. f) Make sure that cylinder is situated on the scales before recovery takes place. g) Start the recovery machine and operate in accordance with manufacturer’s instructions. h) Do not overfill cylinders. (No more than 80 % volume liquid charge).

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

j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equip-

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

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

(10)

Labelling Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.

(11)

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. Empty 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 all appropriate refrigerants including, when applicable, flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order. 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.

[5] Service tools

OBH828

Use the below service tools as exclusive tools for R32 refrigerant.

No. Tool name Specifications

Gauge manifold · Only for R32

· Use the existing fitting

specifications

. (UNF1/2)

· Use high-tension side pressure of 5.3MPa·G or over.

Charge hose · Only for R32

· Use pressure performance of 5.09MPa·G or over.

Electronic scale

Gas leak detector

Adaptor for reverse flow check

Refrigerant charge base

· Use the detector for R134a, R407C, R410a or R32.

· Attach on vacuum pump.

—

Refrigerant cylinder · Only for R32

· Cylinder with syphon

Refrigerant recovery equipment

—

2-3. PRECAUTIONS WHEN REUSING EXISTING R22/R410a REFRIGERANT PIPES

(1) Flowchart

• Refer to the owchart below to determine if the existing pipes can be used and if it is necessary to use a lter dryer.

• If the diameter of the existing pipes is different from the specied diameter, refer to technical data materials to conrm if the

pipes can be used.

The existing pipe thickness meets specications and the pipes are not damaged.

Check if the existing air conditioner can operate.

After operating the cooling system for about 30 minutes, perform pump down work.

Disconnect the existing air conditioner from the pipes.

Connect the new air conditioner.

Perform the airtight test, vacuum air purging, additional refrigerant charging (if necessary), and gas leak check.

Test run

Measure the existing pipe thickness and check for damage.

Note: If the existing air conditioner cannot operate, use a refrigerant recovery device to collect the refrigerant.

The existing pipes cannot be reused. Use new pipes.

The existing pipe thickness does not meet

specications or the pipes are damaged.

(2) Cautions for refrigerant piping work

3/4

19.05

—

1.0

OBH828

New refrigerant R32 is adopted for replacement inverter series. Although the refrigerant piping work for R32 is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R32 is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

Thickness of pipes

Because the working pressure of R32 is higher compared to R22, be sure to use refrigerant piping with thickness shown below. (Never use pipes of 0.7 mm or below.)

Diagram below: Piping diameter and thickness

Nominal

dimensions(inch)

1/4 3/8 1/2 5/8

Outside

diameter

6.35

9.52

12.70

15.88

(mm)

Thickness

R32/R410a R22

0.8

1.0

(mm)

0.8

1.0

Dimensions of flare cutting and flare nut

The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that, R32 is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other refrigerants. Therefore, to enhance airtightness and strength, flare cutting dimension of copper pipe for R32 has been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R32 also has partly been changed to increase strength as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for R32 below. For 1/2 and 5/8 inch pipes, the dimension B changes. Use torque wrench corresponding to each dimension.

Dimension A

Flare cutting dimensions

Nominal

dimensions(inch)

Outside

diameter(mm) 1/4 3/8 1/2 5/8 3/4

6.35

9.52

12.70

15.88

19.05

( )

Dimension A

(mm)

-0.4

R32/R410a R22

9.1

13.2

16.6

19.7

—

9.0

13.0

16.2

19.4

23.3

Flare nut dimensions

Nominal

dimensions(inch)

1/4 3/8 1/2 5/8 3/4

Outside

diameter(mm)

6.35

9.52

12.70

15.88

19.05

R32/R410a

Tools for R32 (The following table shows whether conventional tools can be used or not.)

Tools and materials Use R32 tools Can R22 tools be used? Gauge manifold Air purge, refrigerant Charge hose

Gas leak detector Gas leak check Tool for HFC refrigerant Refrigerant recovery

equipment Refrigerant cylinder Refrigerant charge Tool exclusive for R32 Safety charger

Charge valve

Vacuum pump

Flare tool

Bender

Pipe cutter

Welder and nitrogen gas cylinder

Refrigerant charging scale

Vacuum gauge or thermistor vacuum gauge and vacuum valve

Charging cylinder Refrigerant charge Tool exclusive for R32 –

: Prepare a new tool. (Use the new tool as the tool exclusive for R32.)

: Tools for other refrigerants can be used under certain conditions.

: Tools for other refrigerants can be used.

charge and operation check

Refrigerant recovery Tool exclusive for R32

Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant

Prevent gas from blowing out when detaching charge hose

Vacuum drying and air purge

Flaring work of piping

Bend the pipes

Cut the pipes

Weld the pipes

Refrigerant charge

Check the degree of vacuum. (Vacuum valve prevents back

ow of oil and refrigerant to

thermistor vacuum gauge)

Tool exclusive for R32

Tools for other refrigerants can be used if equipped with adapter for reverse

ow check

Tools for other refrigerants can be used by adjusting

aring dimension

Tools for other refrigerants can be used

(Usable if equipped with

adapter for reverse

ow)

(Usable by adjusting

aring dimension)

Can R407C tools be used?

(Usable if equipped with

adapter for reverse

ow)

(Usable by adjusting

aring dimension)

Dimension B

17.0

22.0

26.0

29.0 *

—

(mm)

R22

17.0

22.0

24.0

27.0

36.0

Can R410a tools be used?

* 36.0mm for indoor unit of RP100, 125 and 140

(Usable if equipped with

adapter for reverse

ow)

(Usable by adjusting

aring dimension)

2-4. CHOOSING THE OUTDOOR UNIT INSTALLATION LOCATION

OBH828

OK OK

OK NG

R32 is heavier than air—as well as other refrigerants— so tends to accumulate at the base (in the vicinity of the floor). If R32 accumulates around base, it may reach a flammable concentration in case room is small. To avoid ignition, maintaining a safe work environment is required by ensuring appropriate ventilation. If a refrigerant leak is confirmed in a room or an area where there is insufficient ventilation, refrain from using of flames until the work environment can be improved by ensuring appropriate ventilation. Install outdoor units in a place where at least one of the four sides is open, and in a sufficiently large space without depressions.

2-5. MINIMUM INSTALLATION AREA

If you unavoidably install a unit in a space where all four sides are blocked or there are depressions, confirm that one of these situations (A, B or C) is satisfied.

Note: These countermeasures are for keeping safety not for specification guarantee.

A) Secure sufficient installation space (minimum installation area Amin).

Install in a space with an installation area of Amin or more, corresponding to refrigerant quantity M (factory-charged refrigerant + locally added refrigerant).

M [kg] Amin [m²]

1.0 12

1.5 17

2.0 23

2.5 28

3.0 34

3.5 39

4.0 45

4.5 50

5.0 56

5.5 62

6.0 67

6.5 73

7.0 78

7.5 84

Amin

B) Install in a space with a depression height of 0.125 [m] or less.

Height from the bottom of

0.125 [m] or less

Height from the bottom of

0.125 [m] or less

C) Create an appropriate ventilation open area.

OBH828

Make sure that the width of the open area is 0.9 [m] or more and the height of the open area is 0.15 [m] or more. However, the height from the bottom of the installation space to the bottom edge of the open area should be 0.125 [m] or less. Open area should be 75% or more opening.

75% or more opening

Width W 0.9 [m] or more

Height from the bottom

0.125 [m] or less

Height H 0.15 [m] or more

■ Indoor units

Install in a room with a floor area of Amin or more, corresponding to refrigerant quantity M (factory-charged refrigerant + locally added refrigerant). * For the factory-charged refrigerant amount, refer to the spec nameplate or installation manual. For the amount to be added locally, refer to the installation manual. Install the indoor unit so that the height from the floor to the bottom of the indoor unit is h0; for wall mounted: 1.8 m or more; for ceiling suspended, cassette and ceiling concealed: 2.2 m or more. * There are restrictions in installation height for each model, so read the installation manual for the particular unit.

M [kg] Amin [m²]

1.0 3

1.5 4.5

2.0 6

2.5 7.5

3.0 9

3.5 12

4.0 15.5

4.5 20

5.0 24

5.5 29

6.0 35

6.5 41

7.0 47

7.5 54

Wall mounted

1.8 [m]

h0 2.2 [m]h0 2.2 [m]h0 2.2 [m]

Ceiling concealedCassetteCeiling suspended

OBH828

PART NAMES AND FUNCTIONS

MXZ-2HA40VF MXZ-2HA50VF

MXZ-3HA50VF

Air inlet

(Back and side)

Piping

Drain hose

Air outlet

Drain outlet

Air inlet

(Back and side)

Air outlet

Drain outlet

ACCESSORIES

Model

Drain socket 1 1

Drain cap - 2

MXZ-2HA40VF MXZ-2HA50VF

MXZ-3HA50VF

OBH828

System

Electrical

Coefcient of performance (C.O.P) (Total)

Compressor

Fan

Special

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-HR25VF + MSZ-HR25VF NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m) COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C HEATING INDOOR Dry-bulb temperature 20.0 °C OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

SPECIFICATION

Outdoor model MXZ-2HA40VF

Outdoor unit power supply

Indoor units number 2

Piping total length m Max. 30

Connecting pipe length m Max. 20

Height difference (Indoor ~ Outdoor) m Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

Breaker capacity A 15

Power input (Total) 1, 2 W 1,050 910

Running current (Total)

data

Power factor (Total) 1, 2 % 94 87

Starting current (Total)

Model SVB130FBBMT

Output W 1,100

Current

Refrigeration oil (Model) L 0.35 (FW68S)

Model RC0J50-NA

Current

motor

Dimensions W x H x D mm 800 x 550 x 285

Weight kg 37

Air ow (Rated) m3 /h 1,704 2,010

Sound level (Rated) dB(A) 44 50

Fan speed (Rated) rpm 780 910

remarks

Pre-charged refrigerant quantity (R32) kg 0.9

Max refrigerant quantity (R32) kg 0.9

1, 2 A 4.15

1, 2 A 0.35

1, 2 A

1, 2 A 7.6

2 kW 4.0 (1.1 - 4.3) 4.3 (1.0 - 4.7)

5.1 - 4.9 - 4.7 (220V - 230V - 240V) 4.8 - 4.6 - 4.4 (220V - 230V - 240V)

1, 2 3.81 4.73

Single phase

220 - 230 - 240 V, 50 Hz

Outdoor model MXZ-2HA50VF

OBH828

Outdoor unit power supply

Indoor units number 2

Piping total length m Max. 30

Connecting pipe length m Max. 20

System

Height difference (Indoor ~ Outdoor) m Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

Breaker capacity A 15

Power input (Total) 1, 2 W 1,520 1,540

Running current (Total)

data

Power factor (Total) 1, 2 % 97

Electrical

Starting current (Total)

Coefcient of performance (C.O.P) (Total)

Model SVB130FBBMT

Output W 1,300

Current

Refrigeration oil (Model) L 0.35 (FW68S)

Compressor

Model RC0J50-NA

Current

Fan

motor

Dimensions W x H x D mm 800 x 550 x 285

Weight kg 37

Air ow (Rated) m3 /h 1,962 2,082

Sound level (Rated) dB(A) 47 51

Fan speed (Rated) rpm 890 940

Special

remarks

Pre-charged refrigerant quantity (R32) kg 0.9

Max refrigerant quantity (R32) kg 0.9

1 Measured under rated operating frequency.

1, 2 A 6.75

1, 2 A 0.35

1, 2 A

1, 2 A 7.6

2 kW 5.0 (1.1 - 5.4) 6.0 (1.0 - 6.4)

7.1 - 6.8 - 6.5 (220V - 230V - 240V) 7.2 - 6.9 - 6.6 (220V - 230V - 240V)

1, 2 3.29 3.90

Single phase

220 - 230 - 240 V, 50 Hz

Outdoor model MXZ-3HA50VF

OBH828

Outdoor unit power supply

Indoor units number 2 to 3

Piping total length m Max. 50

Connecting pipe length m Max. 25

System

Height difference (Indoor ~ Outdoor) m Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

Height difference (Indoor ~ Indoor) m Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

Function Cooling Heating

Capacity Rated frequency (Min.-Max.)

Breaker capacity A 25

Power input (Total) 1, 2 W 1,260 1,300

Running current (Total)

data

Power factor (Total) 1, 2 % 97

Electrical

Starting current (Total)

Coefcient of performance (C.O.P) (Total)

Model SVB130FBBM1T

Output W 1,300

Current

Refrigeration oil (Model) L 0.6 (FW68S)

Compressor

Model SIC-82FX-F764-1

Current

Fan

motor

Dimensions W x H x D mm 840 x 710 x 330

Weight kg 57

Air ow (Rated) m3 /h 1,860 1,746

Sound level (Rated) dB(A) 46 50

Fan speed (Rated) rpm 600 580

Special

remarks

Pre-charged refrigerant quantity (R32) kg 1.4

Max refrigerant quantity (R32) kg 1.6

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-HR25VF + MSZ-HR25VF + MSZ-HR25VF NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m) COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C HEATING INDOOR Dry-bulb temperature 20.0 °C OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C

1, 2 A 5.30

1, 2 A 0.5

1, 2 A

1, 2 A 6.7

2 kW 5.0 (2.9 - 6.5) 6.0 (2.6 - 7.5)

5.9 - 5.6 - 5.4 (220V - 230V - 240V) 6.1 - 5.8 - 5.6 (220V - 230V - 240V)

1, 2 3.97 4.62

Single phase

220 - 230 - 240 V, 50 Hz

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

OUTDOOR UNIT

OBH828

NOISE CRITERIA CURVES

FAN SPEED

FUNCTION

SPL(dB(A))

CoolingHigh

HeatingHigh

LINE

MXZ-2HA50VFMXZ-2HA40VF

FAN SPEED

FUNCTION

SPL(dB(A))

CoolingHigh

HeatingHigh

LINE

APPROXIMATE

THRESHOLD OF HEARING FOR CONTINUOUS NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

MXZ-3HA50VF

FAN SPEED

FUNCTION

CoolingHigh

HeatingHigh

SPL(dB(A))

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

LINE

APPROXIMATE

THRESHOLD OF HEARING FOR CONTINUOUS NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

APPROXIMATE

THRESHOLD OF HEARING FOR CONTINUOUS NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

MICROPHONE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

Test conditions Cooling :Dry-bulb temperature 35.0°C Wet-bulb temperature 24.0°C Heating :Dry-bulb temperature 7.0°C Wet-bulb temperature 6.0°C

OBH828

MXZ-2HA40VF MXZ-2HA50VF

OUTLINES AND DIMENSIONS

Unit: mm (inch)

500 or more

MXZ-3HA50VF

OBH828

Unit: mm (inch)

1.Installation space

Note : Leave front and both sides free of obstruction.

Note : Leave front and overhead free of obstruction.

100 or more

Note : Leave rear, overhead and both sides free of obstruction.

100 or more

500 or more

200 or more

350 or more

2.Service space

100 or more

350 or more

100 or more

500 or more

Service space

350 or more

ACL, ACL2

F701, 801, 901

IC700, 820, 932

SYMBOL

NOTES:

:Terminal block

About the indoor side electric wiring refer to the

indoor unit electric wiring diagram for the service.

Use copper conductors only.

(For field wiring).

Symbols below indicate.

FUSE (T3.15AL250V)

OBH828

WIRING DIAGRAM

MXZ-2HA40VF -

MXZ-2HA50VF -

POWER SUPPLY

~/N

220-230-240V

50Hz

TB1

GNYE

LD66B

CN722

1 2

21S4

CN721

X64

BNOG

ACL

TO INDOOR

UNIT No. B

BREAKER

CIRCUIT

ACL2

BKBUBKBNBKBURD

LD-E1

LD62

LD-E2

X66

X63

PTC65

PTC64

IC802

T801

F801

220-230-240V~

12-24V

S3S2S1

TB3

BURDOG

CN601

LD61

F61

F701

CN935

INVERTER P.C. BOARD

CN642

TO INDOOR

UNIT No. A

220-230-240V~

12-24V

S3S1S2

TB2

CN602

CN724

CN725

CN644

CN641

CN643

OUTDOOR

1 4

1 2

DISPLAY

P.C. BOARD

CN936

LED1 LED2

RT68RT62

t°

RT61

t°

RT65RT64

t°t°

LEV A

LEV B

NAME

SYMBOLNAME

FIN TEMP. THERMISTOR

RT64

AMBIENT TEMP. THERMISTOR

RT65

OUTDOOR HEAT EXCHANGER

TERMINAL BLOCK

TRANSFORMER

TEMP. THERMISTOR

T801

RT68

TB1~3

RELAY

REVERSING VALVE COIL

21S4

X63, 64, 66

C61C63

C62

LD66A

LD70

DB61

IC820

F62

F901

CN932

CNMC

313

UWV

IC932

LDU

BKWHRD

LDV

CN931

LDW

IC700

POWER DEVICE

IC802

SYMBOLNAME

:Connector

REACTOR

LED

EXPANSION VALVE COIL

COMPRESSOR

FAN MOTOR

LED1, 2

LEV A, B

SMOOTHING CAPACITOR

DIODE MODULE

DB61

C61~63

CIRCUIT PROTECTOR

DISCHARGE TEMP. THERMISTOR

DEFROST THERMISTOR

RT61

RT62

PTC64, 65

FUSE (25A 250V)

FUSE (15A 250V)

POWER MODULE

F61

F62

MXZ-2HA40VF -

ACL, ACL2

F701, 801, 901

IC700, 820, 932

SEMBOL

NOTLAR:

:Terminal bloğu

İç ünite elektrik devresiyle ilgili bakım için iç ünite elektri

devre şemasını referans alınız.

Sadece bakır kablolar kullanınız.

(Saha elektrik devresi için).

Sembollerin anlamı.

OBH828

ET1

MXZ-2HA50VF -

GÜÇ KAYNAĞI

ET1

İÇ ÜNİTE

~/N

230V

50Hz

No. B

İÇ ÜNİTE

No. A

TB1

21S4

ACL

TB3

CN642

230V~

12-24V

S3S2S1

BURDOG

CN601

LD61

F61

F701

CN935

İNVERTÖR BASKILI

DEVRE KARTI

DEVRE KESİCİ

GNYE

BNOG

ACL2

BKBUBKBNBKBURD

LD-E1

LD62

LD66B

CN722

CN721

X64

1 2

LD-E2

X66

X63

PTC65

PTC64

IC802

T801

F801

TB2

CN602

CN724

CN725

CN644

CN641

CN643

1 4

1 2

S3S1S2

12-24V

DIŞ GÖSTERGE

t°

t°t°

230V~

CN936

BASKILI DEVRE

KARTI

LED1 LED2

LEV A

LEV B

RT68RT62

PARÇA ADI

FIN SICAKLIK TERMİSTÖRÜ

DIŞ ÜNİTE EŞANJÖR

SICAKLIK TERMİSTÖRÜ

RT61

RT65RT64

ORTAM SICAKLIK TERMİSTÖRÜ

RT64

RT65

SEMBOLPARÇA ADI

RT68

TRANSFORMATÖR

RÖLE

İKİ YÖNLÜ VANA SARGISI

TERMİNAL BLOĞU

T801

21S4

TB1~3

X63, 64, 66

C61C63

C62

LD66A

LD70

DB61

F62

F901

RD 3

IC820

313

CN932

CNMC

UWV

IC932

LDU

BKWHRD

LDV

CN931

LDW

IC700

SEMBOLPARÇA ADI

:Konnektör

GÜÇ CİHAZI

LED

GENLEŞME VANASI SARGISI

IC802

LED1, 2

LEV A, B

DİYOT MODÜLÜ

REAKTÖR

SÜZME KAPASİTÖR

DB61

C61~63

BASMA SICAKLIK TERMİSTÖRÜ

KOMPRESÖR

FAN MOTORU

DEVRE KORUMASI

DEFROST TERMİSTÖRÜ

RT61

RT62

PTC64, 65

SİGORTA (T3.15AL250V)

SİGORTA (25A 250V)

SİGORTA (15A 250V)

GÜÇ MODÜLÜ

F61

F62

MXZ-3HA50VF -

OBH828

MXZ-3HA50VF -

OBH828

ET1

OBH828

REFRIGERANT SYSTEM DIAGRAM

MXZ-2HA40VF MXZ-2HA50VF

R.V. coil OFF ON

Refrigerant flow in cooling Refrigerant flow in heating

Compressor

Discharge temperature thermistor RT62

Muffler

UNIT: mm

Indoor unit

Stop valve (with service port)

Capillary tube

Stop valve

(with strainer #100)

Capillary tube

Stop valve

(with strainer #100)

LEV A

LEV B

Sub muffler

MAX REFRIGERANT PIPING LENGTH

Piping length each indoor unit (a, b) 20 m

Total piping length (a+b) 30 m

Bending point for each unit 30

Total bending point 20

It is irrelevant which unit is higher.

4-way valve

Indoor units

Outdoor heat exchanger temperature thermistor RT68

FAN-OUT

Ambient

HEX-OUT

Strainer #100

Distributor

temperature thermistor RT65

Defrost thermistor RT61

Capillary tube

Max. Height difference

Outdoor unit

15 m

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

900 0

Refrigerant piping length (one way, 2 unit total)

30 m

Outdoor unit union diameter For

Indoor unit A

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Liquid 6.35(1/4)

Gas 9.52(3/8)

15 m

10 m

UNIT: mm (inch)

MXZ-3HA50VF

OBH828

UNIT: mm

R.V. coil OFF ON

Indoor unit

Refrigerant flow in cooling Refrigerant flow in heating

Capillary tube

Indoor unit

Strainer #100

Capillary tube

Strainer #100

Capillary tube

Strainer #100

High-pressure switch

Muffler

LEV A

LEV B

LEV C

Oil separator

Stop valve with service port

Strainer #100

Compressor

4-way valve

Stop valve

Discharge temperature

thermistor RT62

Capillary tube

Power

receiver

LEV E

Charge pipe

HEX-OUT

Strainer #100

Distributor

Outdoor heat exchanger temperature thermistor RT68

FAN-OUT

Ambient temperature thermistor RT65

Defrost thermistor RT61

Capillary tube

MAX REFRIGERANT PIPING LENGTH

Piping length each indoor unit (a, b, c) 25 m Total piping length (a+b+c) 50 m Bending point for each unit 25 Total bending point 50

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

1,400 0 200

Calculation: Xg = 20 g/m x (Refrigerant piping length (m) - 40)

Refrigerant piping length (one way, 3 unit total)

40 m 50 m

Indoor units

Outdoor unit union diameter

For

Indoor unit A

Indoor unit B

Indoor unit C

Max. Height difference

Outdoor unit

15 m

10 m

UNIT: mm (inch)

Liquid 6.35(1/4)

Gas 9.52(3/8)

Liquid 6.35(1/4)

Gas 9.52(3/8)

Liquid 6.35(1/4)

Gas 9.52(3/8)

15 m

PUMPING DOWN

OBH828

When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.

1) Turn off the breaker.

2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.

3) Fully close the stop valve on the liquid pipe side of the outdoor unit.

4) Turn on the breaker.

5) Start the emergency COOL operation on all the indoor units.

6) When the pressure gauge shows 0.05 to 0 MPa [Gauge] (approximately 0.5 to 0 kgf/cm²), fully close the stop valve on the gas

pipe side of the outdoor unit and stop the operation. (Refer to the indoor unit installation manual about the method for stopping the operation.) * If too much refrigerant has been added to the air conditioner system, the pressure may not drop to

proximately 0.5 to 0 kgf/cm²) ant circuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.

7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.

When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.

, or the protection function may operate due to the pressure increase in the high pressure refriger-

WARNIG

0.05 to 0 MPa [Gauge] (ap-

OBH828

PERFORMANCE CURVES

MXZ-2HA40VF MXZ-2HA50VF MXZ-3HA50VF

The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been pro-

vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 - 264 V 50 Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature: °CWB

(2) Indoor outlet air wet-bulb temperature: °CWB (3) Outdoor intake air dry-bulb temperature: °CDB (4) Total input: W (5) Indoor intake air dry-bulb temperature: °CDB (6) Outdoor intake air wet-bulb temperature: °CWB (7) Total input: W

Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service.

How to measure the indoor air wet and dry bulb temperature difference

1. Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.

2. Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake.

Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of room.

5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

}

Cooling

Heating

INDOOR UNIT

Wet and dry bulb thermometers

FRONT VIEW

OUTDOOR UNIT

Wet and dry bulb thermometers

BACK VIEW

9-1. CAPACITY AND THE INPUT CURVES

OBH828

MXZ-2HA40VF MXZ-2HA50VF

8.7

5.9

8.0

5.5

7.3

5.0

6.6

4.6

5.9

4.1

5.3

3.7

difference (°C)

4.6

3.2

Indoor air Wet-bulb temperature

2.8

4.0

11.1

10.2

9.3

8.3

7.5

6.6

5.8

5.0

1.4

1.3

1.2

1.1

Indoor intake air Wet-bulb temperature (°C)

1.0

0.9

0.8

Capacity correction factors

0.7

Cooling capacity

22 20 18

35 class

22.2

20.6

19.0

17.4

15.8

14.3

12.7

11.1

9.5

7.9

6.3

35 class

42 class

(MXZ-2HA50VF)

26.6

24.7

22.8

20.9

19.0

17.1

15.2

13.3

11.4

9.5

7.6

42 class

(MXZ-2HA50VF)

25 class

21.3

19.8

18.3

16.7

15.2

13.7

12.2

difference (°C)

10.7

9.1

Indoor air Dry-bulb temperature

7.6

6.1

25 class

-10 0 15 30 45 Outdoor intake air Dry - bulb temperature (ºC)

1.4

Total input (Cooling)

1.3

1.2

1.1

Indoor intake air Wet-bulb temperature (°C)

1.0

0.9

Input correction factors

0.8

0.7

-10 0 15 30 45 Outdoor intake air Dry - bulb temperature (ºC)

1.4

Heating capacity

1.3

1.2

1.1

1.0

0.9

0.8

0.7

Indoor intake air Dry-bulb temperature (°C)

0.6

0.5

Capacity correction factors

0.4

-12 0 8 18

-16 -8 -4 4 12 16 Outdoor intake air Wet

Outdoor intake air Wet

1.4

Total input (Heating)

bulb temperature (

1.3

1.2

1.1

1.0

0.9

0.8

Indoor intake air Dry-bulb temperature (°C)

0.7

Input correction factors

0.6

0.5

0.4

-12 0 8 18

-16 -8 -4 4 12 16 Outdoor intake air Wet

Outdoor intake air Wet

bulb temperature (

46-5 5 10 20 25 35 40

20 18

46-5 5 10 20 25 35 40

20 26

)

ºC

26 20

)

ºC

MXZ-3HA50VF

Indoor intake air Dry-bulb temperature (°C)

OBH828

difference (°C)

Indoor air Wet-bulb temperature

5.9

5.5

5.0

4.6

4.1

3.7

3.2

2.8

25 class

8.7

11.1

8.0

10.2

7.3

9.3

6.6

8.3

5.9

7.5

5.3

6.6

4.6

5.8

4.0

5.0

35 class

12.8

11.6

10.5

9.5

8.5

7.5

6.6

5.6

42 class

50 class

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

Capacity correction factors

-10 0 15

Indoor intake air Wet-bulb temperature (°C)

-5 5 10 20 25 35 40

Outdoor intake air Dry

Cooling capacity

- bulb temperature (

ºC

)

45 46

26 24 22 20 19 18

21.3

22.2

29.9

19.8

20.6

27.8

18.3

19.0

25.7

16.7

17.4

23.5

15.2

15.8

21.4

13.7

14.3

19.2

12.2

12.7

difference (°C)

10.7

9.1

Indoor air Dry-bulb temperature

7.6

6.1

25 class

11.1

9.5

7.9

6.3

35 class

17.1

15.0

12.8

10.7

8.6

42 class

38.4

35.7

32.9

30.2

27.4

24.7

21.9

19.2

16.5

13.7

11.0

50 class

1.4

Total input (Cooling)

1.3

1.2

1.1

Indoor intake air Wet-bulb temperature (°C)

1.0

0.9

0.8

0.7

0.6

0.5

Input correction factors

0.4

-10 0 15

-5 5 10 20 25 35 40

Outdoor intake air Dry

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

Capacity correction factors

0.4

-16 -8 -4 4 12 18

Indoor intake air Dry-bulb temperature (°C)

-12 0 8 16 Outdoor intake air Wet

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

Input correction factors

0.5

0.4

Heating capacity

Total input (Heating)

- bulb temperature (

bulb temperature (

ºC

18 19 20 16 22 24 26

45 46

)

ºC

15 20 26

)

-16 -8 -4 4 12 18-12 0 8 16

Outdoor intake air Wet

bulb temperature (

)

ºC

9-2. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY (single operation)

OBH828

MXZ-2HA40VF

25-class unit

2.0

<COOL>Capacity

2.0

<COOL>Total input

2.0

<HEAT>Capacity

2.5

<HEAT>Total input

1.5

1.0

0.5

0 50 100 150

Frequency

35-class unit

<COOL>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

1.5

1.0

0.5

0 50 100 150

Frequency

<COOL>Total input

2.5

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

1.5

1.0

0.5

0 50 100 150

Frequency

<HEAT>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

2.0

1.5

1.0

0.5

<HEAT>Total input

0 50 100 150

Frequency

MXZ-2HA50VF

OBH828

25-class unit

<COOL>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

35-class unit

<COOL>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

42-class unit

<COOL>Capacity

2.0

<COOL>Total input

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

<COOL>Total input

2.5

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

<COOL>Total input

2.0

<HEAT>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

<HEAT>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

<HEAT>Capacity

1.5

2.5

2.0

1.5

1.0

0.5

<HEAT>Total input

0 50 100 150

Frequency

2.0

1.5

1.0

0.5

<HEAT>Total input

0 50 100 150

Frequency

1.5

<HEAT>Total input

1.5

1.0

0.5

0 50 100 150

Frequency

1.5

1.0

0.5

0 50 100 150

Frequency

1.0

0.5

0 50 100 150

Frequency

1.0

0.5

0 50 100 150

Frequency

MXZ-3HA50VF

OBH828

25-class unit

<COOL>Capacity

2.0

<COOL>Total input

2.0

<HEAT>Capacity

2.0

<HEAT>Total input

1.5

1.0

0.5

0 50 100 150

Frequency

35-class unit

<COOL>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

42-class unit

1.5

1.0

0.5

Frequency

<COOL>Capacity

1.5

1.0

0.5

0 50 100 150

Frequency

<COOL>Total input

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

<COOL>Total input

2.0

1.5

1.0

0.5

1.5

1.0

0.5

0 50 100 150

Frequency

<HEAT>Capacity

2.0

1.5

1.0

0.5

0 50 100 150

Frequency

<HEAT>Capacity

1.5

1.0

0.5

1.5

1.0

0.5

0 50 100 150

Frequency

2.0

1.5

1.0

0.5

<HEAT>Total input

0 50 100 150

Frequency

1.5

1.0

0.5

<HEAT>Total input

0 50 100 150

Frequency

50-class unit

<COOL>Capacity

1.5

1.0

0.5

0 50 100 150

Frequency

0 50 100 150

Frequency

<COOL>Total input

1.5

1.0

0.5

0 50 100 150

Frequency

0 50 100 150

Frequency

<HEAT>Capacity

1.5

1.0

0.5

0 50 100 150

Frequency

0 50 100 150

Frequency

1.5

1.0

0.5

<HEAT>Total input

0 50 100 150

Frequency

9-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation>

Outdoor low pressure

Outdoor unit current (A)

Outdoor low pressure

Outdoor unit current (A)

Outdoor low pressure

Outdoor unit current (A)

Ambient humidity (%)

Outdoor low pressure

Outdoor unit current (A)

Ambient humidity (%)

Outdoor low pressure

Outdoor unit current (A)

OBH828

1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL : Press once, HEAT : Press twice).

2. Test run operation starts and continues to operate for 30 minutes.

3. Compressor operates at rated frequency.

4. Indoor fan operates at High speed.

5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor varies).

6. To cancel test run operation or EMERGENCY OPERATION, press EMERGENCY OPERATION switch or any button on remote controller.

9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT CURVE (single operation)

NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system).

The conversion factor is : 1 (MPa [Gauge]) = 10.2 (kgf/cm

[Gauge])

(1) COOL operation

Both indoor and outdoor units are under the

same temperature/humidity condition.

Operation : TEST RUN OPERATION (Refer to 9-3.)

Dry-bulb temperature (

30 70

Relative humidity (%)

)

MXZ-2HA40VF

25-class unit 35-class unit

(MPa[Gauge])

1.3

1.2

1.1

1.0

0.9

0.8

0.7

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

30Hz

(°C)

15 20 25 30 35

(%)

50 60

Ambient temperature ( )

30Hz

(°C)

(%)

Ambient humidity (%)

(MPa[Gauge])

1.3

1.2

1.1

1.0

0.9

0.8

0.7

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

MXZ-2HA50VF

25-class unit 35-class unit

(MPa[Gauge])

1.3

1.2

1.1

1.0

0.9

0.8

0.7

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

30Hz

(°C)

15 20 25 30 35

(%)

50 60

Ambient temperature ( )

30Hz

(°C)

(%)

(MPa[Gauge])

1.3

1.2

1.1

1.0

0.9

0.8

0.7

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

30Hz

(°C)

15 20 25 30 35

(%)

50 60

Ambient temperature ( )

30Hz

(°C)

(%)

Ambient humidity (%)

30Hz

(°C)

15 20 25 30 35

(%)

50 60

Ambient temperature ( )

30Hz

(°C)

(%)

42-class unit

(MPa[Gauge])

1.3

1.2

1.1

1.0

0.9

0.8

0.7

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

(°C)

(%)

30Hz

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

(°C)

(%)

MXZ-3HA50VF

Outdoor low pressure

Outdoor unit current (A)

Outdoor low pressure

Outdoor unit current (A)

Outdoor low pressure

Outdoor unit current (A)

Outdoor low pressure

Outdoor unit current (A)

OBH828

25-class unit 35-class unit

(MPa[Gauge])

1.4

1.3

1.2

1.1

1.0

0.9

0.8

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

40Hz

(°C)

15 20 25 30 35

(%)

50 60

40Hz

(°C)

(%)

Ambient temperature ( ) Ambient humidity (%)

(MPa[Gauge])

1.4

1.3

1.2

1.1

1.0

0.9

0.8

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

42-class unit 50-class unit

(MPa[Gauge])

1.4

1.3

1.2

1.1

1.0

0.9

0.8

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

40Hz

(°C)

15 20 25 30 35

(%)

50 60

40Hz

(°C)

(%)

Ambient temperature ( ) Ambient humidity (%)

(MPa[Gauge])

1.4

1.3

1.2

1.1

1.0

0.9

0.8

15 20 25 30 35

50 60

Ambient temperature ( ) Ambient humidity (%)

40Hz

(°C)

15 20 25 30 35

(%)

50 60

40Hz

(°C)

(%)

Ambient temperature ( ) Ambient humidity (%)

40Hz

(°C)

15 20 25 30 35

(%)

50 60

40Hz

(°C)

(%)

Ambient temperature ( ) Ambient humidity (%)

(2) HEAT operation

Outdoor unit current (A)

OBH828

Condition :

Indoor

Dry bulb temperature (°C)

Wet bulb temperature (°C)

20.0

14.5

Operation : TEST RUN OPERATION (Refer to 9-3.)

MXZ-2HA40VF

25-class unit

0 5 10 15 20 25

Ambient temperature ( )

35-class unit

34Hz

0 5 10 15 20 25

Ambient temperature ( )

MXZ-2HA50VF

25-class unit

35-class unit 42-class unit

34Hz

Outdoor

151220.0

14.5

0 5 10 15 20 25

Ambient temperature ( )

MXZ-3HA50VF

0 5 10 15 20 25

Ambient temperature ( )

34Hz

48Hz

0 5 10 15 20 25

Ambient temperature ( )

35-class unit

0 5 10 15 20 25

Ambient temperature ( )

34Hz

48Hz

0 5 10 15 20 25

Ambient temperature ( )

42-class unit

0 5 10 15 20 25

Ambient temperature ( )

48Hz

34Hz

50-class unit 25-class unit

0 5 10 15 20 25

Ambient temperature ( )

48Hz

OBH828

ACTUATOR CONTROL

MXZ-2HA40VF MXZ-2HA50VF

Relation between main sensor and actuator

Sensor Purpose

Discharge temperature thermistor Protection

Indoor coil temperature thermistor

Defrost thermistor Heating: Defrosting Fin temperature thermistor Protection

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Capacity code Control

Cooling: Coil frost prevention Heating: High pressure protection

Control/Protection Heating: Defrosting (Heater)

Cooling: Control/Protection

MXZ-3HA50VF

Relation between main sensor and actuator

Sensor Purpose

Discharge temperature thermistor

Indoor coil temperature thermistor

Defrost thermistor Heating: Defrosting Fin temperature thermistor Protection

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Capacity code Control

Protection

Cooling: Coil frost prevention Heating: High pressure protection

Control/Protection Heating: Defrosting (Heater)

Cooling: Control/Protection

Compressor LEV

Actuator

fan motor

Outdoor

fan motor

Outdoor

R.V. coil

4-way

valve

OBH828

SERVICE FUNCTIONS

MXZ-2HA40VF MXZ-2HA50VF MXZ-3HA50VF

11-1. THE POSITION OF SWITCH <MXZ-2HA40VF/2HA50VF>

SW1 SW2

Outdoor display P.C. board

1 2 3 4 5 6

<MXZ-3HA50VF>

SW871

CN750

CN751

Outdoor control P.C. board

11-2. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)

With this function, once the operation mode is locked to either COOL/DRY mode or HEAT mode, the air conditioner operates in that mode only. Changing the setting is required to activate this function. Explain about this function to your customers and ask them whether they want to use it.

SW1

1 2 3 4 5 6

SW2

1 2 3 4 5 6

[How to lock the operation mode] (1) Turn OFF the power supply and make sure that the LED goes off. (2) Set SW1 as shown in the figure below. (3) Turn ON the power supply.

<MXZ-2HA40VF/2HA50VF> <MXZ-3HA50VF>

SW1 on the outdoor display P.C. board

Cool/Dry Heat SW1

SW1

SW1 on the outdoor control P.C. board

Cool/Dry Heat SW1

SW1

11-3.

SW1

OBH828

LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT

With this function, the operating noise of the outdoor unit can be lowered by reducing the operation load, for example, during nighttime in COOL mode. However, note that the cooling and heating capacity may lower if this function is activated. Changing the setting is required to activate this function. Explain about this function to your customers and ask them whether they want to use it.

[How to lower the operating noise] (1) Turn OFF the power supply and make sure that the LED goes off. (2) Set "3" on SW1 to ON to enable this function. (MXZ-2HA40VF/2HA50VF) Set "5" on SW1 to ON the enable this function. (MXZ-3HA50VF) (3) Turn ON the power supply.

<MXZ-2HA40VF/2HA50VF> <MXZ-3HA50VF>

SW1 on the outdoor display P.C. board

SW1 on the outdoor control P.C. board

SW1

11-4. AUTOMATIC LINE CORRECTING

OBH828

<MXZ-2HA40VF/2HA50VF>

This outdoor unit has an automatic line correcting function which automatically detects and corrects improper wiring or piping.

<MXZ-2HA40VF/2HA50VF>

Improper wiring or piping can be automatically detected when one indoor unit is operated in COOL mode for 30 minutes. When improper wiring or piping is detected, wiring lines are corrected (A to B/ B to A) with the software.

NOTE: This function may not work due to the condition or environment of the unit, such as the following:

- gas leak, closed stop valve

- unit failure such as defective LEV

- indoor/outdoor temperature

NOTE: This function does not work when "2" on SW2 on the outdoor display P.C. board is turned OFF.

Terminal block

Liquid/ Gas pipe

Outdoor unit

Terminal block

Liquid/ Gas pipe

Outdoor unit

Terminal block

Liquid/ Gas pipe

Outdoor unit

The record of automatic line correcting can be checked in the following way: (1) Turn OFF the power supply and make sure that the LED goes off. (2) Turn ON "3" on SW2 on the outdoor display P.C. board. (3) Turn ON the power supply. (4) Check the correction state with the LED lamps on the outdoor display P.C. board. (5) Turn OFF the power supply and make sure that the LED goes off. (6) Turn OFF "3" on SW2 on the outdoor display P.C. board. (7) Turn ON the power supply.

Number of blinks

LED1 (Red) LED2 (Yellow)

Once Once Not corrected

3 times 3 times Corrected

B A

Indoor unit B

B A

Indoor unit A

B A

Indoor unit B

B A

Indoor unit A

B A

Indoor unit B

B A

Indoor unit A

MXZ-2HA40VF/2HA50VF

Wiring line

SW2 on the outdoor display P.C. board

SW2

MXZ-2HA40VF/2HA50VF

SW2 on the outdoor display P.C. board

SW2

Indoor/outdoor connecting wire

Refrigerant pipe

<MXZ-3HA50VF>

OBH828

Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping.

Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected. This will be completed in about 10 to 15 minutes.

[How to activate this function]

1. Check that outside temperature is above 0˚C. (This function does not work when the outside temperature is 0˚C or below.)

2. Check that the stop valves of the liquid pipe and gas pipe are open.

3. Check that the wiring between indoor and outdoor unit is correct. (If the wiring is not correct, this function does not work.)

4. Turn ON the power supply and wait at least 1 minute.

5. Press the piping/wiring correction switch (SW871) on the outdoor control P.C. board. Do not touch energized parts.

LED indication during detection:

LED1 (Red)

Lit

LED indication after detection:

LED1 (Red)

Lit

Once

Make sure that the valves are open and the pipes are not collapsed or clogged.

6. Press the switch to cancel.

LED indication after cancel :

LED1 (Red)

Lit

LED2 (Yellow)

Lit

LED2 (Yellow)

Not lit

Once

Other indications

LED2 (Yellow)

Lit

LED3 (Green)

Once

LED3 (Green)

Lit

Once

LED3 (Green)

Not lit

Result Completed (Problem corrected/ normal) Not completed (Detection failed) Refer to "SAFETY PRECAUTIONS WHEN LED BLINKS"

located behind the top panel.

NOTE: Indoor unit cannot be operated while this function is activated. When this function is activated while indoor unit is operating, the operation will be stopped. Operate indoor unit after the auto line correcting is finished. Pressing the switch during detection cancels this function.

The record of auto line correcting can be confirmed in the following way:

Press the switch for more than 5 seconds. LED will show the record of auto correcting for about 30 seconds as shown in the table below:

Number of blinks

LED1 (Red)

Once

3 times

NOTE: Activate this function to confirm the correct wiring after replacing the outdoor control P.C. board. (Previous records are deleted when the outdoor control P.C. board is replaced.) The record cannot be shown if auto line correcting is not canceled (Refer to "How to activate this function").

LED2 (Yellow)

Once

3 times

LED3 (Green)

Lit Lit

Wiring line

Not corrected Corrected

OBH828

TROUBLESHOOTING

MXZ-2HA40VF MXZ-2HA50VF MXZ-3HA50VF

12-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the unit rst with the remote controller, and after conrming

the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.

3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.

4) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.

5) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.

Lead wiring

3. Troubleshooting procedure

Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality. To

make sure, check how many times the OPERATION INDICATOR lamp is blinking on and off before starting service work

2) Before servicing, check that the connector and terminal are connected properly.

3) When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.

4) Refer to 12-2, 12-3 and 12-4.

Connector housing

12-2. FAILURE MODE RECALL FUNCTION

This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (12-4.) disappears, the memorized failure details can be recalled.

1. Flow chart of failure mode recall function for the indoor/outdoor unit Refer to the service manual of indoor unit.

2. Flow chart of the detailed outdoor unit failure mode recall function

OBH828

Operational procedure

The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures.

Make sure that the remote controller is set to the failure mode recall function.

With the remote controller headed towards the indoor unit, press the TEMPERATURE buttons to adjust the set temperature to 25°C. 2

Does the OPERATION INDICATOR lamp on the

indoor unit blink at the interval of 0.5 seconds?

Blinks: The outdoor unit is abnormal. Beep is emit-

ted at the same timing as the blinking of the OPERATION INDICATOR lamp.

Yes (Blinks

The outdoor unit is abnormal. Check the blinking pattern, and make sure that the abnormal point with the table of outdoor unit failure mode recall function (12-2.3.). Make sure to check at least 2 consecutive blinking cycles.

)

No (OFF)

The outdoor unit is normal.

Release the failure mode recall function. 1

Repair the failure parts.

Delete the memorized abnormal condition. 1

Release the failure mode recall function. 1

NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

1. Refer to the service manual of indoor unit.

2. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

3. Blinking pattern when outdoor unit is abnormal:

2.5-second OFF 3-second ON

OFF

No beep

Repeated cycle

Blinking at 0.5second interval

Beeps

2.5-second OFF 3-second ON

No beep Beeps

Repeated cycle

Blinking at 0.5-

second interval

Repeated cycle

3. Table of outdoor unit failure mode recall function

OBH828

MXZ-2HA

Upper or

left lamp of

OPERATION

INDICATOR

lamp (Indoor

unit) OFF None (Normal) 2-time blink Outdoor power system Lit Lit Overcurrent protection cut-out operates

3-time blink Discharge temperature

4-time blink Overcurrent Once Not lit The overcurrent ows into intelligent

5-time blink Discharge temperature Lit Lit Discharge temperature exceeds 116ºC

Abnormal point

(Failure mode/protection)

thermistor Defrost thermistor Lit Once

Ambient temperature thermistor

Fin temperature thermistor Lit 3 times

P.C. board temperature thermistor

Outdoor heat exchanger temperature thermistor

Compressor Twice Not lit The overcurrent ows into intelligent

LED indication

(Outdoor P.C. board)

LED 1 LED 2

Not lit Not lit

Lit Once Thermistor shorts or opens during

Lit Twice

Lit 4 times • Replace the inverter P.C. board.

Lit 9 times • Refer to 12-6.

9 times Not lit Waveform of compressor current is dis-

— — —

3 consecutive times within 1 minute after the compressor gets started. Compressor protection cut-out operates 24 consecutive times within 10 seconds after the compressor gets started.

compressor running.

power module.

power module within 10 seconds after the compressor gets started. ( The compressor gets restarted in 15 seconds.)

torted.

during operation.

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (12-4).

Condition Remedy

• Check the compressor connecting wire.

• Refer to 12-6. inverter/compressor".

• Check the stop valve.

• Refer to 12-6. door thermistors".

door thermistors".

• Check the compressor connecting wire.

• Refer to 12-6. inverter/compressor".

• Check the stop valve.

• Check the compressor connecting wire.

• Refer to 12-6. inverter/compressor".

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 12-6.

"How to check

"Check of out-

"How to check

"Check of LEV".

Indoor/

outdoor

unit failure

mode recall

function

○

○ ○ ○ ○ ○ ○

—

6-time blink High pressure Lit Lit The outdoor heat exchanger temperature

7-time blink Fin temperature 3 times Not lit The n temperature exceeds 90ºC

P.C. board temperature 4 times Not lit The P.C. board temperature exceeds

8-time blink Outdoor fan motor Lit Lit Failure occurs 3 consecutive times

9-time blink Nonvolatile memory data Lit 5 times Nonvolatile memory data cannot be read

Power module 7 times Not lit The output of the power module that

10-time blink Discharge temperature Lit Lit The discharge temperature is kept

11-time blink Current sensor 8 times Not lit The sensor circuit of current of

Bus-bar voltage 6 times Not lit The bus-bar voltage exceeds 430 V or

14-time blink Stop valve Lit 12 times The current of compressor is power

17 time blink Outdoor refrigerant system

abnormality

Lit 17 times A closed valve and air trapped in the

exceeds 70ºC during cooling or the indoor gas pipe temperature exceeds 70ºC during heating.

during operation.

80ºC during operation.

within 30 seconds after the fan gets started.

properly.

drove the compressor was shorted or the winding of the compressor was shorted.

under 50ºC (COOL mode)/40ºC (HEAT mode) for more than 40 minutes.

compressor shorts or opens during compressor operate.

falls to 50 V or below during compressor operating.

module is out of order.

refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor.

• Check the refrigerant circuit and the refrigerant amount.

• Check the stop valve.

•

Check the around outdoor unit.

• Check the outdoor unit air pas-

sage.

• Refer to 12-6.

door fan motor".

• Refer to 12-6.

door fan motor".

• Replace the inverter P.C. board.

• Refer to 12-6.

inverter/compressor".

• Check the refrigerant circuit and

the refrigerant amount.

• Refer to 12-6.

• Replace the inverter P.C. board.

• Check the power supply.

• Replace the inverter P.C. board.

• Check the stop valve.

• Check the refrigerant circuit and

the refrigerant amount.

Check for a gas leak in a connecting

•

piping etc.

• Check the stop valve.

• Refer to 12-6.

door refrigerant circuit".

"Check of out-

"How to check

"Check of LEV".

"Check of out-

—

○

—

○

NOTE: Blinking patterns of this mode differ from the ones of

OBH828

MXZ-3HA

The left lamp of

OPERATION IN-

DICATOR lamp

(Indoor unit)

OFF None (Normal) Lit Lit 2-time blink Outdoor power system Lit Lit

3-time blink

4-time blink Overcurrent Once Not lit

5-time blink Discharge temperature Lit Lit

6-time blink High pressure Lit Lit

7-time blink Fin temperature 3 times Not lit

8-time blink Outdoor fan motor Lit Lit

9-time blink Outdoor control system Lit 5 times

10-time blink Low discharge temperature

11-time blink Communication error

15-time blink LEV and drain pump Lit Lit The indoor unit detects an abnormality in

Abnormal point

(Failure mode/protection)

Discharge temperature thermistor Defrost thermistor Ambient temperature thermistor Fin temperature thermistor P.C. board temperature thermis-

tor Outdoor heat exchanger tem-

perature thermistor

P.C. board temperature 4 times Not lit

protection

between P.C. boards

Current sensor Lit 7 times

Zero cross detecting circuit 5 times Not lit

Converter 5 times Not lit

Bus-bar voltage 5 times Not lit

LED indication

(Outdoor P.C.

board)

LED1 LED2

Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started, or converter protection cut-out or bus-bar voltage protection cut-out operates 3 consecutive times within 3 minutes

Lit Once Lit Once Lit Twice Lit 3 times Lit 4 times • Replace the outdoor control P.C.

Lit 9 times • Refer to 12-6.

Lit Lit

Lit 6 times

after startup. A thermistor shorts or opens during

compressor running.

21 A current ows into power module.

The discharge temperature exceeds 115°C during operation. Compressor can restart if discharge temperature thermistor reads 80°C or less 3 minutes

later The outdoor heat exchanger temperature ex-

ceeds 70°C during cooling or the indoor gas pipe temperature exceeds 70°C during heating.

The n temperature exceeds 88°C during operation.

The P.C. board temperature exceeds 67°C during operation.

A failure occurs 3 consecutive times within 30 seconds after the fan gets started.

Nonvolatile memory data cannot be read properly.

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 39°C for more than 20 minutes.

Communication error occurs between the outdoor control P.C. board and outdoor power P.C. board for more than 10 seconds.

The communication between boards protection cut-out operates 2 consecutive times.

A short or open circuit is detected in the current sensor during compressor operating.

Current sensor protection cut-out operates 2 consecutive times.

Zero cross signal cannot be detected while the compressor is operating.

The protection cut-out of the zero cross detecting circuit operates 10 consecutive times.

A failure is detected in the operation of the converter during operation.

The bus-bar voltage exceeds 400 V or falls to low level during compressor operating.

the LEV and drain pump.

Troubleshooting check table (12-4.).

Condition Remedy

• Check the connection of the compressor connecting wire.

• Refer to 12-6.

"How to check inverter/compres-

sor".

• Check the stop valve.

• Refer to 12-6. "Check of outdoor thermistors".

board.

thermistors".

• Reconnect compressor connector.

• Refer to 12-6. verter/compressor".

• Check the stop valve.

• Check refrigerant circuit and refrigerant amount.

• Refer to 12-6.

• Check refrigerant circuit and refrigerant amount.

• Check the stop valve.

• Check around outdoor unit.

• Check outdoor unit air passage.

• Refer to 12-6. fan motor".

• Refer to 12-6. "Check of outdoor fan motor".

• Replace the outdoor control P

• Check refrigerant circuit and refrigerant amount.

• Refer to 12-6.

• Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board.

• Check the connecting wire among outdoor control P.C. board and outdoor power P.C. board.

• Check the voltage of power supply.

• Replace the outdoor power P.C. board.

• Check the voltage of power supply.

• Replace the outdoor control P.C. board.

• Refer to 12-6.

• Check the drain pump of the indoor unit.

"Check of outdoor

"How to check in-

"Check of LEV". —

"Check of outdoor

.C. board.

"Check of LEV".

—

"Check of LEV".

Indoor/

outdoor unit

failure mode

recall function

○

—

○

—

○

—

○

—

○

—

12-3. INSTRUCTION OF TROUBLESHOOTING

OBH828

• Check the indoor unit referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page.

Operation start

Check the outdoor unit LED indicator.

Both LED1 and LED2 are OFF.

Both LED1 and LED2 are lighting.

LED1 or LED2 has blinked.

Refer to 12-6. "Check of power supply".

• Indoor unit

serial signal error Refer to 12-6. "How to check miswiring and serial signal error".

• COOL or

HEAT operation only Refer to 12-6. "Check of R.V. coil".

• When cooling, heat

exchanger of non-operating indoor unit frosts.

• When heating, non-

operating indoor unit gets warm. Refer to 12-6. "Check of LEV".

• When cooling

dew drops in the non-operating indoor unit. Check of mispiping.

Refer to 12-4. "Troubleshooting check table".

• When heating,

room does not get warm. Refer to 12-6. "How to check inverter/compressor".

Check mispiping,

shortage of capacity.

• When cooling,

room does not cool. Refer to 12-6. "How to check inverter/ compressor".

12-4. TROUBLESHOOTING CHECK TABLE

OBH828

MXZ-2HA

Symptom

No.

Outdoor unit

does not operate.

'Outdoor unit stops and restarts

3 minutes later' is repeated.

Outdoor unit operates.

Indication

LED1(Red) LED2(Yellow)

Lit Once

Lit Twice

Lit 3 times

Lit 4 times

5 timesLit

Lit 7 times

Lit 17 times

Twice Not lit

3 times Not lit

4 times Not lit

5 times Not lit

9 times Not lit

13 times

8 times Not lit

10 times

Once

Twice Lit

3 times

Not lit

Lit

Abnormal point / Condition Remedy

LEV and drain pump

Outdoor power system

Discharge temperature thermistor

Fin temperature thermistor

P.C board temperature thermistor

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Nonvolatile memory data

Outdoor refrigerant system abnormality

Overcurrent

Discharge temperature protection

Fin temperature protection P.C. board temperature protection

High pressure protection

Bus-bar voltage protection

Outdoor fan motor

Current sensor protection

Compressor

Primary current protection

Secondary current protection

High pressure protection

Defrosting in cooling

Discharge temperature protection

The indoor unit detects an abnormality in the LEV and drain pump.

Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started.

A short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 10 minutes of compressor startup.

A short or open circuit is detected in the thermistor during operation.

A short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 5 minutes (in cooling) and 10 minutes (in heating) of compressor startup.

A short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 5 minutes of compressor startup.

The nonvolatile memory data cannot be read properly.

A closed valve and air trapped in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor.

18 A current flows into intelligent power module.

Discharge temperature exceeds 116°C during operation. Compressor restart if discharge temperature thermistor reads 100°C or less 3 minutes later.

The fin temperature exceeds 90°C during operation.

The P.C. board temperature exceeds 78°C during operation.

The outdoor heat exchanger temperature exceeds 70°C during cooling or indoor gas pipe temperature exceeds 70°C during heating.

The bus-bar voltage exceeds 430 V or falls to 50 V or below during compressor operating.

Failure occurs 3 consecutive times within 30 seconds after the fan gets started.

A short or open circuit is detected in the current sensor during compressor operating.

The compressor does not synchronize with the operating power.

The input current exceeds 10 A.

The current of the compressor exceeds 17 A.

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

The discharge temperature exceeds 100°C during operation.

Condition

• Refer to 12-6.

• Check the drain pump of the indoor unit.

• Check the connection of the compressor connecting wire.

• Refer to 12-6.

• Check the stop valve.

• Refer to 12-6.

• Replace the inverter P.C. board.

• Refer to 12-6.

• Replace the inverter P.C. board.

• Check for a gas leak in a connecting piping etc.

• Check the stop valve.

• Refer to 12-6.

• Reconnect compressor connector.

• Refer to 12-6.

• Check the stop valve.

• Check the amount of gas and the refrigerant circuit.

can

• Refer to 12-6.

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 12-6.

• Check the amount of gas and the refrigerant circuit.

• Check the stop valve.

• Replace the inverter P.C. board.

• Refer to 12-6.

• Replace the inverter P.C. board.

• Reconnect compressor connector.

• Refer to 12-6.

• Check the stop valve.

These symptoms do not mean any abnormality of the product, but check the following points.

• Check if indoor filters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 12-6.

"Check of LEV".

"How to check inverter/compressor".

"Check of outdoor thermistors".

"Check of outdoor refrigerant circuit".

"How to check inverter/compressor".

"Check of LEV".

"Check of outdoor fan motor".

"How to check inverter/compressor".

"Check of LEV".

"Check of outdoor thermistors".

4 times

Low discharge

Lit

temperature protection

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 50°C (COOL mode)/40°C (HEAT mode) for more than 40 minutes.

• Refer to 12-6.

• Check the refrigerant circuit and the refrigerant amount.

"Check of LEV".

Symptom

OBH828

No.

Outdoor unit operates.

Indication

LED1(Red) LED2(Yellow)

5 times

Lit

Abnormal point / Condition Remedy

Cooling high pressure protection

The outdoor heat exchanger temperature exceeds 58°C during operation.

Condition

This symptom does not mean any abnormality of the product, but check the following points.

• Check if indoor filters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

Outdoor unit

operates normally.

NOTE: 1. The location of LED is illustrated at the right figure. Refer to 12-7.4.

2. LED is lighted during normal operation. The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) The blinking frequency is “2”.

8 times

9 times

Lit

2.5-second OFF 2.5-second OFF

OFF

Converter protection

Lit

Inverter check mode

Lit

Normal

Lit

A failure is detected in the operation of the converter during operation.

The connector of compressor is disconnected. Inverter check mode starts.

0.5-second ON

• Check the voltage of power supply.

• Replace the inverter P.C. board.

Outdoor display P.C. board (Parts side)

Lit

LED1

LED2

MXZ-3HA

OBH828

No. Symptom

1 Outdoor

unit does not operate.

13 Lit 15 times Relay operation No relay operation is detected during operation. • Replace the outdoor power P.C. board.

14 'Outdoor unit

stops and restarts 3 minutes later' is repeated.

Indication

LED1(Red) LED2(Yellow)

Lit Once LEV and drain pump

Lit Twice

Lit 3 times

Lit 4 times

Lit 5 times

Lit 6 times

Lit 7 times Outdoor control system

Lit 8 times Current sensor

Lit 11 times

Lit 12 times

Lit 13 times Current sensor

Lit 14 times Voltage sensor

Twice Not lit

3 times Not lit

4 times Not lit

5 times Not lit

6 times Not lit Pre-heating protection Overcurrent is detected during pre-heating.

8 times Not lit Converter protection

9 times Not lit

11 times Not lit

Abnormal point / Con-

dition

Outdoor power system

Discharge temperature thermistor

Fin temperature thermistor

P. C. board temperature thermistor

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Zero cross detecting circuit (Outdoor control

.C. board)

Communication error between P.C. boards

communication

M-NET error

Zero cross detecting circuit (Outdoor power P.C. board)

IPM protection

Lock protection

Discharge temperature protection

Fin temperature protection

P.C. board temperature protection

High pressure protection

Bus-bar voltage protection

Low outside temperature protection(cooling)

Condition Remedy

The indoor unit detects an abnormality in the LEV and drain pump.

Overcurrent protection cut-out operates 3 consecu tive times within 1 minute after the compressor gets started, or converter protection cut-out or busbar voltage protection cut-out operates 3 consecutive times within 3 minutes after startup.

short circuit is detected in the thermistor during

A operation, or an open circuit is detected in the ther mistor after 10 minutes of compressor startup.

A short or open circuit is detected in the thermistor during operation.

short circuit is detected in the thermistor during

A operation, or an open circuit is detected in the thermistor after 5 minutes (in cooling) and 10 minutes (in heating) of compressor startup.

short circuit is detected in the thermistor during

A operation, or an open circuit is detected in the thermistor after 5 minutes of compressor startup.

Zero cross signal cannot be detected. • Replace the outdoor control P.C. board.

The nonvolatile memory data cannot be read properly.

Current sensor protection cut-out operates 2 con secutive times.

The communication protection cut-out between boards operates 2 consecutive times.

M-NET adapter P.C. board detects an abnormality in the communication error.

The protection cut-out of the zero cross detecting circuit operates 10 consecutive times.

A short or open circuit is detected in the input cur rent detection circuit during operation.

A short or open circuit is detected in the input voltage detection circuit during operation.

Overcurrent is detected after 30 seconds of com pressor startup.

Overcurrent is detected within 30 seconds of com pressor startup.

The discharge temperature exceeds 115°C during operation. Compressor can restart if discharge temperature thermistor reads 80°C or less 3 minutes later.

The n temperature exceeds during operation.

The P.C. board temperature exceeds during operation.

High pressure is detected with the high pressure switch (HPS) during operation.

The outdoor heat exchanger temperature exceeds 70°C during cooling or the indoor gas pipe tem perature exceeds 70°C during heating.

A failure is detected in the operation of the converter during operation.

The bus-bar voltage exceeds 400 V or falls to low level during compressor operating.

The ambient became -12°C or less.

• Refer to 12-6.

• Check the drain pump of the indoor unit.

eck the connection of the compressor connect-

• Ch ing wire.

• Refer to 12-6. sor".

• Check the stop valve.

• Refer to 12-6.

• Replace the outdoor control P

• Refer to 12-6.

• Replace the outdoor control P.C. board.

• Replace the outdoor power P

• Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board.

• Check the connecting wire between M-NET adapter P.C. board and outdoor control P.C. board, or terminal block.

• Replace the outdoor power P.C. board.

• Reconnect compressor connector

• Refer to 12-6.

compressor".

• Check the stop valve.

• Check the power module (PAM module).

• Check the amount of gas and refrigerant circuit.

• Refer to 12-6.

•Check refrigerant circuit and refrigerant amount.

•Refer to 12-6.

• Check around of gas and the refrigerant circuit.

• Check the stop valve.

• Reconnect compressor connector

• Refer to 12-6.

compressor".

• Check the power module.

• Replace the outdoor power P

• Check the voltage of power supply.

• Replace the outdoor power P.C. board or the outdoor control P.C. board.

• Refer to 12-6.

"Check of LEV".

"How to check inverter/compres-

"Check of outdoor thermistors".

.C. board.

"Check of outdoor thermistors".

.C. board.

"How to check inverter/

"Check of LEV".

"Check of outdoor fan motor".

"How to check inverter/

"Check of bus-bar voltage".

—

.C. board.

No. Symptom

Outdoor control P.C. board

OBH828

22 'Outdoor unit

stops and restarts

3 minutes later' is

repeated.

26 Outdoor unit

operates.

Outdoor

unit operates normally.

35 Lit Lit Normal

NOTE 1. The location of LED is illustrated at the right figure. Refer to 12-7.1.

2. LED is lighted during normal operation. The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the blinking frequency is “2”.

2.5-second OFF 2.5-second OFF

OFF

Indication

LED1(Red) LED2(Yellow)

13 times Not lit Outdoor fan motor

Lit 8 times

Lit 11 times

Lit 12 times

Once Lit

Twice Lit

3 times Lit

4 times Lit

5 times Lit

7 times Lit

11 times Lit

8 times Lit

9 times Lit Inverter check mode

Abnormal point / Con-

dition

A failure occurs 3 consecutive times within 30

Current sensor protection

Communication between P.C. boards protection

Zero cross detecting circuit (Outdoor power P

.C. board)

Primary current protec tion

High pressure protection

Defrosting in cooling

Discharge temperature protection

Low discharge temperature protection

Cooling high pressure protection

High Low Pressure bypass valve Cooling evaporating temperature drop prevention control

M-NET communication error

Cooling evaporating temperature protection

0.5-second ON 0.5-second ON

seconds after the fan gets started. A

short or open circuit is detected in the current

sensor during compressor operating. Communication error occurs between the outdoor

control P.C. board and outdoor power P.C. board for more than 10 seconds.

Zero cross signal cannot be detected while the compressor is operating.

The input current exceeds 13.6 A.

The indoor gas pipe temperature exceeds 45°C during heating.

The indoor gas pipe temperature falls 3°C or below during cooling.

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 50°C(COOL mode)/40°C(HEAT mode) for more than 40 minutes.

The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 39°C for more than 20 minutes.

The outdoor heat exchanger temperature exceeds 58°C during operation.

During cooling operation, the temperature of indoor heat exchanger becomes 3°C or less within 1 hour after the compressor starts running, or it becomes less than 12°C - 16°C* later than that. * It depends on the difference between the set temperature and the room temperature.

M-NET adapter P.C. board detects an abnormality in the communication error.

During cooling operation, the temperature of indoor heat exchanger becomes 7°C - 11°C* or less within 1 hour after the compressor starts running, or it becomes 9°C - 17°C* or less later than that. * It depends on the indoor unit type/model or the

difference between the set temperature and the room temperature.

The unit is operated with emergency operation switch.

Condition Remedy

— —

• Refer to 12-6.

• Replace the outdoor power P.C. board.

• Check the connecting wire between outdoor con trol P.C. board and outdoor power P.C. board.

• Replace the outdoor power P.C. board.

These symptoms do not mean any abnormality of the product, but check the following points.

• Check if indoor lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

• Check refrigerant circuit and refrigerant amount.

• Refer to 12-6.

• Check refrigerant circuit and refrigerant amount.

This symptom does not mean any abnormality of the product, but check the following points.

• Check if indoor lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air circulation is short cycled.

This symptom does not mean any abnormality of the product, but check the following points.

• Check the indoor lters are not clogged.

• Check there is sufcient refrigerant.

• Check the indoor/outdoor unit air circulation is not short cycled.

• Check the connecting wire between M-NET adapter P.C. board and outdoor control P.C. board, or terminal block.

This symptom does not mean any abnormality of the product.

"Check of outdoor fan motor".

"Check of LEV". "Check of outdoor thermistors".

"Check of LEV".

—

(Parts side)

LED2

LED1

Lit

12-5. TROUBLE CRITERION OF MAIN PARTS

OBH828

MXZ-2HA40VF MXZ-2HA50VF MXZ-3HA50VF

Part name Check method and criterion

Defrost thermistor (RT61) Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68)

Discharge temperature thermistor (RT62)

Compressor

RED

WHT

BLK

Outdoor fan motor

WHT

RED BLK

2 3

MXZ-2HA40VF/2HA50VF

Outdoor fan motor

MXZ-3HA50VF

Measure the resistance with a tester.

Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2. "Outdoor control P.C. board " or 3. "Outdoor power P.C. board" for the chart of thermistor.

Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.

Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2. "Outdoor control P.C. board ", for the chart of thermistor.

Measure the resistance between terminals with a tester. (Winding temperature : -10°C - 40°C)

Normal (Each phase)

- 1.06

0.86

Measure the resistance between lead wires with a tester. (Part temperature : -10°C - 40°C)

Normal (Each phase)

- 43

Refer to 12-6.

R.V. coil

Linear expansion valve

WHT

RED

ORN

YLW

LEV

BLU

High pressure switch (HPS)

MXZ-3HA50VF

Measure the resistance with a tester. (Part temperature : -10°C - 40°C)

Normal

MXZ-2HA40VF MXZ-2HA50VF

1.2 k

- 1.56 k 1.26 k - 1.62 k

MXZ-3HA50VF

Measure the resistance with a tester. (Part temperature : -10°C - 40°C)

Color of lead wire Normal

WHT - RED RED - ORN

YLW - RED

37.4

- 53.9

RED - BLU

Pressure Normal

HPS

3.43 ± 0.15 MPa Close

4.14 ± 0.1 MPa Open

12-6. TROUBLESHOOTING FLOW

OBH828

Outdoor unit does not operate.

Check of power supply

MXZ-2HA40VF/2HA50VF

Check the main power supply circuit for proper connections.

Turn ON the power supply.

Is there voltage of 220 - 230 - 240 V AC in the power supply terminal block?

Yes

Is there voltage of 220 - 230 - 240 V AC between LD66B and X64 on the inverter P.C. board?

Yes

Is there voltage of 220 - 230 - 240 V AC between LD66A and LD70 on the inverter P.C. board?

Yes

Is there voltage of 311 - 339 V DC between DB61 and DB61 on the inverter P.C. board?

Is there voltage of 5 V DC between CN936 and CN936 on the outdoor display P.C. board?

Replace the outdoor display P.C. board.

Yes

MXZ-3HA50VF

Check the power supply and correct them.

Replace the inverter P.C. board.

Replace the reactor.

Replace the inverter P.C. board.

Check the connected wire between the inverter P.C. board and outdoor display P.C. board and correct it. Replace the inverter P.C. board.

Check the main power supply circuit for proper connections.

Turn ON the power supply.

Is there voltage of 220 - 230 - 240 V AC in the power supply terminal block?

Yes

Is the output voltage from the outdoor power P.C. board 311 - 339 V DC?

Turn OFF the power supply and recconnect the reactor.

Is the reactor short-circuited?

Yes

Replace the outdoor power P.C. board.

Check the power supply cable.

Yes

Replace the outdoor control P.C. board.

Replace the reactor.

replacing the indoor electronic control

• When the indoor unit does not operate, it cannot be operated either with the remote controller or with the

OBH828

EMERGENCY OPERATION switch.

• When the outdoor unit does not operate, the OPERATION INDICATOR lamp on the indoor unit blinks ON and OFF

every 0.5-second.

How to check miswiring and serial signal error (when outdoor unit does not work)

MXZ-2HA40VF/2HA50VF

LED indication for communication status

Communication status is indicated by the LED.

Unit status No

Blinking: normal communication

Lit: abnormal communication or not connected

NOTE: "Lit" and "Not lit" in the table below

does not indicate abnormal.

Outdoor display P.C. board

LED1 LED2

Blinking

LED 1 LED 2 Unit A Unit B status status

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and S2 ?

seYNot lit: The outdoor P.C. board is abnormal.

Press the EMERGENCY OPERATION switch once.

Does the OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

seY

Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?

Turn OFF the power supply.

Remove the indoor/outdoor connecting wire from the outdoor terminal block connected with the indoor unit on which miswiring or the serial signal error is indicated. Short-circuit between S2 and S3 of the outdoor terminal block .

Check the power supply and correct the problem.

Replace the indoor electronic control P.C. board. *1

Is there rated voltage between outdoor terminal block S1 and S2?

Check the indoor/outdoor

seY

connecting wire and correct the problem.

*1 Turn OFF the power supply before

P.C. board.

Refer to indoor unit service manual.

Check the indoor/outdoor

oNoN

connecting wire and correct the problem.

If the trouble sometimes occurs, possible causes are as follows:

• Poor connection of the indoor/ outdoor connecting wire Check for intermediate connection of the indoor/outdoor connecting wire, loose connection to the terminal block, and cut wire inside the cable. If any of them is found, correct the problem(s).

• Effects of the inverter lighting on the indoor unit If the trouble occurs or does not occur depending on whether the light is on or off, distance the lighting from the indoor unit or apply the glass filter on the receiving part of the indoor unit.

• Noise on the indoor/outdoor connecting wire Pass the indoor/outdoor connecting wire through a different route if the existing wiring is arranged as below:

• The indoor/outdoor connecting wire runs near the other equipment.

• The indoor/outdoor connecting wire is detoured and run long.

power supply cable of

Turn ON the power supply.

Does the LED on the outdoor display P.C. board or the outdoor control P.C. board repeat quick BLINKING and OFF? *2

No (Lighted or not lighted)

Replace the inverter P.C. board or the outdoor control P.C. board. *3 *4

*2 The LED indicates the status of serial communication. Check the communication status.

Replace the indoor

Yes

electronic control P.C. board. *1 *4

*1 Turn OFF the power supply before replacing the indoor electronic control P.C. board. Refer to indoor unit service manual. *3 Turn OFF the power supply before replacing the inverter P.C. board. Be careful of residual voltage of smoothing capacitor. *4 Remove the short-circuit between outdoor terminal block S2 and S3. Connect the indoor/outdoor connecting wire.

MXZ-3HA50VF

OBH828

LED indication for communication status

Communication status is indicated by the LED.

Unit status Blinking: normal communication Lit: abnormal communication or not connected

Pattern 1 and 2 is repeatedly displayed alternately. Each pattern is displayed for 10 seconds.

NOTE: "Lit" in the table below does not indicate abnormal communication.

Outdoor control P.C. board

Pattern

LED 1 LED 3LED 2

Unit A status

Unit C status

LED1 LED2

Blinking

LED3

Unit B status

Unit D status

Not lit

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>

Lit

Is serial signal error indicated 6 minutes later?

Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not miswiring.

Bridge the outdoor terminal block S2 and S3. 1

Yes

Check the power supply.

Check the wiring.

Is there any miswiring, poor contact, or wire

disconnection of the indoor/outdoor connecting wire?

1 Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.

Yes

Correct them.

· Turn OFF inverter-controlled lighting equipment.

· Turn OFF the power supply and then turn ON again.

· Press EMERGENCY OPERATION switch.

Is serial signal error indicated 6 minutes later?

· Reinstall either the unit or the light away from each

other.

· Attach a filter on remote control receiving

Yes

section of the indoor unit.

Turn ON the power supply.

Does the LED on the outdoor control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"?

Yes

Turn OFF the power supply. Remove the bridge between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 V DC between outdoor terminal block S2 and S3? <Confirmation of serial signal>

Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage>

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

Refer to indoor unit service manual.

Yes

(Lit or not lit)

Replace the outdoor control P.C. board.

2 Be careful of the residual

voltage of smoothing capacitor.

Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block?

Yes

Replace the indoor/outdoor connecting wire.

The cooling operation or heating operation does not operate.

OBH828

Check of R.V. coil

MXZ-2HA40VF/2HA50VF

• The heating operation does not operate.

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode.

Is there voltage of 220 - 230 - 240 V AC between pin1 and pin2 at connector CN721?

Yes

Turn OFF the power supply. Disconnect the connector CN721.

Is there normal resistance to R.V. coil? (Refer to 12-5.)

Yes

Replace the 4-way valve.

• The cooling operation does not operate.

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in COOL mode.

Replace the R.V. coil.

Connector MXZ-2HA

CN721 Inverter P.C. board

Replace the inverter P.C. board.

Is there voltage of 220 - 230 - 240 V AC between pin1 and pin2 at connector CN721?

Replace the 4-way valve.

Yes

Replace the inverter P.C. board.

MXZ-3HA50VF

OBH828

• When cooling operation does not work.

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in COOL mode.

Connector MXZ-3HA

CNAC CN712

CNAC2

Outdoor control P.C. board

Outdoor power P.C. board

Is there voltage of 220 - 230 - 240 V AC between pin1 and pin2 at connector CN712?

Yes

Turn OFF the power supply. Disconnect the connector CNAC2.

Is there normal resistance to R.V. coil? (Refer to 12-5.)

Yes

Replace the 4-way valve.

• When heating operation does not work.

1. Disconnect the lead wire leading to the compressor.

2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode.

Is there voltage of 220 - 230 - 240 V AC between pin1 and pin2 at connector CN712?

Yes

Replace the R.V. coil.

Is there voltage 220 - 230 - 240 V AC between the pin1 and pin3 at connector CNAC?

Replace the outdoor control P.C. board.

Replace the 4-way valve.

Yes

Replace the outdoor

power P.C. board.

Replace the outdoor control P.C. board.

• When cooling, heat exchanger of non-operating indoor unit frosts.

OBH828

• When heating, non-operating indoor unit gets warm.

Check of LEV

Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.

Is "click - click" sound heard? Or, do you feel vibration of LEV coil with your hand?

Disconnect the connectors. CN724: LEV A, CN725: LEV B (MXZ-2HA) CN791: LEV A, CN792: LEV B, CN793: LEV C (MXZ-3HA), CN797: LEV R (MXZ-3HA) Is there normal resistance to LEV coil? (Refer to 12-5.)

Replace LEV coil.

Yes

Replace the outdoor control P.C. board.

Normal

Connector MXZ-2HA MXZ-3HA

CN724 CN725

CN791 CN792 CN793 CN794 CN795 CN796

Inverter P.C. board

―

Outdoor control P.C. board

• When heating, room does not get warm.

OBH828

• When cooling, room does not get cool.

How to check inverter/compressor

Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the outdoor power P.C. board.

start EMERGENCY OPERATION.

Measure the voltage between each lead wire leading to the compressor. U (BLK) - V (WHT) V (WHT) - W (RED) W (RED) - U (BLK) Output voltage: Is proper output voltage detected? 1, 2

50V-250V

Yes

Is output balanced?

Yes

(Except MXZ-2HA) Is the input voltage to the outdoor control P.C. board 370 V or more?

3 minutes after the power supply is turned ON,

1 • After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage.

• The output voltage values have the tolerance of ± 20%. 2 • The output differs depending on the capacity or the number of indoor units to be operated.

Replace the outdoor power P.C. board.

Yes

Turn OFF the power supply of indoor and outdoor unit, and measure the compressor winding resistance between the compressor terminals. Is the resistance between each terminal normal? (Refer to 12-5.)

Yes

Reconnect the lead wire of compressor, and turn ON the power supply to indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.

Clarify the causes by counting time until the inverter stops. 0 to 10 seconds: compressor layer short 10 to 60 seconds: compressor lock 60 seconds to 5 minutes: refrigerant circuit defective 5 minutes or more: normal

Replace the compressor.

• When thermistor is abnormal.

OBH828

Check of outdoor thermistors

Disconnect the connector in the following table and measure the resistance of the thermistor to check whether the thermistor is normal or not. (Refer to 12-7.)

Normal

Reconnect the connector in the following table and disconnect the lead wire leading to the compressor. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION.

Does the unit operate 10 minutes or more without showing thermistor abnormality?

Yes

Normal

MXZ-2HA40VF MXZ-2HA50VF

Thermistor Defrost Discharge temperature Fin temperature Ambient temperature Outdoor heat exchanger temperature

MXZ-3HA50VF

Thermistor Defrost Discharge temperature Outdoor heat exchanger temperature Ambient temperature Fin temperature

Symbol

RT61 RT62 RT64 RT65 RT68

Symbol

RT61 RT62 RT68 RT65 RT64

Abnormal

Connector, Pin No. CN641 pin1 and pin2 CN641 pin3 and pin4 CN642 pin1 and pin2 CN643 pin1 and pin2 CN644 pin1 and pin3

Connector, Pin No. Between CNTH1 pin1 and pin2 Between CNTH1 pin3 and pin4 Between CNTH1 pin7 and pin8 Between CNTH2 pin1 and pin2 Between CN171 pin1 and pin2

Replace the thermistor except RT64. If RT64 is abnormal, replace the outdoor power P.C. board since RT64 is combined with this board.

Replace the outdoor control P.C. board or the outdoor power P.C. board.

Board

Inverter P.C. board

Board

Outdoor control P.C. board

Outdoor power P.C. board

• Fan motor does not operate or stops operating shortly after starting the operation.

Disconnect CN932 and measure the resistance of the outdoor fan motor.

Turn ON the breaker. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between (+) and (-) Between (+) and (-) Between (+) and (-)

Is the resistance of outdoor fan motor normal? (Refer to 12-5.)

Does the outdoor fan motor rotate smoothly?

Does the voltage between each terminal become 5 V DC and 0 V DC repeatedly?

Replace the outdoor fan motor.

Replace the inverter P.C. board or the outdoor control P.C. board.

Yes

OBH828

Check of outdoor fan motor

MXZ-2HA40VF/2HA50VF

Connector MXZ-2HA

CN931 CN932

Inverter P.C. board

MXZ-3HA50VF

OBH828

Disconnect CNF1 and measure the resistance of the outdoor fan motor.

Is the resistance of outdoor fan motor normal? (Refer to right table.)

Yes

Does the outdoor fan motor rotate smoothly?

Yes

Turn on the power supply to start operation and measure the voltage of connector CNF1.

Is the voltage of connector CNF1 normal? (Refer to right table.)

Yes

Turn OFF the power supply and connect the connector CNF1. Turn ON the power supply and measure the voltage of connector CNF1 while rotating the motor by the hand.

Connector MXZ-3HA

Replace the outdoor fan motor.

CNF1

pin1 - pin4

pin5 - pin4

pin6 - pin4

* To measure the voltage, connect the negative (-) end of the tester to pin4. * Voltage between pin4 and pin6 should be measured within 1 minute after the operation starts.

Replace the outdoor control P.C. board.

Voltage

325 V DC

15 V DC

1 - 5 V DC

Measuring points

pin1 - pin4

pin5 - pin4

pin6 - pin4

pin7 - pin4

* To measure the resistance, connect the negative (-) end of the tester to pin4.

CNF1

Outdoor control

P.C. board

Resistance

60 kΩ

160 kΩ

Does the voltage between pin7 and pin4 of connector CNF1 repeat 0 V and 5 V?

Yes

Start operation.

Does the fan motor operate for about 5 seconds?

Yes

Replace the outdoor control P.C. board.

Replace the outdoor fan motor.

• When the operation frequency does not go up from the lowest frequency.

OBH828

Check of HPS

Connector MXZ-3HA

CN63H

MXZ-3HA50VF

1. Disconnect the connector CN63H in the outdoor control P.C. board.

2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF.

Outdoor control P.C. board

Check the resistance between each terminal.

0 Ω

Reconnect CN63H. Turn ON the power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.

Is HPS protection displayed immediately after compressor starts?

Normal

Yes

Infinity

Replace the outdoor control P.C. board.

Replace HPS.

The other cases

Indoor unit does not operate. (different operating models in multi system)

• When you try to run 2 indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal to

the outdoor units rst decides the operation mode.

• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and then turn them back ON.

• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that the refrigerant gas

continuously ows into the indoor unit even while it is not operating.

Check of bus-bar voltage

MXZ-3HA50VF

•Check the voltage of power supply.

•Conrm outdoor unit failure mode

recall function. (Refer to 12-2.2.)

Conrm LED1 indication lamp on the outdoor control P.C. board.

Blink 5 times

Replace the outdoor power P.C. board.

Turn ON power supply. Start operation.

Conrm LED1 indication lamp on the outdoor control P.C.

board.

Blink 9 times

Replace the outdoor control P.C. board.

Turn OFF power supply before removing P.C. board.

Lighting Lighting

Normal

Lighting

Replace the outdoor control P.C. board.

Turn ON power supply. Start operation.

Conrm LED1 indication lamp on the outdoor control P.C.

board.

Blink 9 times

Replace the outdoor power P.C. board.

Check of outdoor refrigerant circuit

OBH828

MXZ-2HA40VF/2HA50VF

Has the operation stopped during pump down?

Yes

The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn the power supply OFF.

CAUTION : Do not start the operation again to prevent hazards.

Was the operation started with the stop valve closed, and was it opened during operation?

The refrigerant gas amount may be 60% or less than the normal amount. Identify where the gas is leaking from,

and x the leak.

The unit occasionally stops when the stop valve is opened or closed during operation. Open the stop valve and

Yes

start the cooling operation again.

12-7. TEST POINT DIAGRAM AND VOLTAGE

OBH828

1. Inverter P.C. board

MXZ-2HA40VF MXZ-2HA50VF

Back side of unit

220-230-240 V AC (LD66A, LD70)

Output to drive outdoor fan

Output to drive compressor

(LDU, LDV, LDW) motor (CN932)

280 - 370 V DC (DB61(+), (-))

Fin temperature thermistor/RT64 (CN642)

FUSE (F901) T3.15AL250V

Signal of outdoor fan motor (CN931)

Ambient temperature thermistor /RT65 (CN643)

Smoothing capacitor (C61, C62, C63)

Outdoor heat exchanger temperature thermistor /RT68 (CN644)

Discharge temperature thermistor/RT62 (CN641)

Defrost thermistor/RT61 (CN641)

FUSE (F801) T3.15AL250V

R.V. coil (CN721)

Heater (CN722)

FUSE (F701) T3.15AL250V

LEV A coil

LEV B coil

(CN724)

(CN725)

220-230-240 V AC (X64 , LD66B)

Connect to outdoor display P.C. board (CN935)

220-230-240 V AC (LD61, LD62)

220-230-240 V AC

(CN601 , ) Serial signal A

(CN601 , ) Serial signal B (CN601

CN602 )

Front side of unit

Defrost thermistor(RT61) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68)

100

Resistance(k )

-20 -10 0 10 20 30 40

Temperature (°C)

Resistance (kΩ)

Discharge temperature thermistor (RT62)

800

700

600

500

400

300

200

100

0 10 20 30 40 50 60 70 80 90 100 110 120

Fin temperature thermistor(RT64)

200

180

160

140

120

100

Resistance(k )

0 10 20 30 40 50 60 70 80

Temperature (°C)Temperature (°C)

Discharge temperature thermistor (RT62)

2. Outdoor control P.C. board

OBH828

MXZ-3HA50VF

CN741 Signal translation (

To Communication

adaptor board

VFG (Rotate signal) (Voltage between right pins of PC931, pin 3 and pin 4) (Correspond to

(CNF1 (+)- (−))

VSP (Rotate instruction) (Voltage between pins of C930): 0 V DC (when stopped),

1.8 - 6.5 V DC (when operated) (Same as

(CNF1 (+)- (−))

CNF1

To fan motor Bus-bar voltage 290 - 370 V DC

15 V DC

Rotate instruction (Constant voltage)

Rotate signal (Pulse wave)

CNDC Bus-bar voltage 290 - 370 V DC

220 - 230 - 240 V AC

)

CN601

Serial signal 12 ~ 24 V

Room B

Room A

Input

Room C

)

CN611

Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68)

100

Resistance (kΩ)

-20 -10 0 10 20 30 40 (ºC)

Temperature

Thermistor R25 = 10 kΩ ± 2% B constant = 3950 ± 2%

Rt = 10exp{3950( )}

F711 FUSE T3.15AL250V

CNAC to outdoor power P.C. board

220 - 230 - 240 V AC

Input

CN714 Defrost heater

220 - 230 - 240 V AC

Output

CN713 Valve coil

220 - 230 - 240 V AC

Output

273+t1298

CN63H High pressure switch

CN702 Signal transmission (To power board) 5 V DC pulse wave

(+)

15 V

(-) (-)

15 V

(-)

CN701 Signal transmission (To power board) 5 V DC pulse wave

CNTH2 Ambient temperature thermistor (RT65)

CNTH1

Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62)

Defrost thermistor (RT61)

SW1

SW871

SW2

CN793 LEV Room C CN797 LEV Room R

(-)

(+)

CN791 LEV Room A CN792 LEV Room B

LEV: 12 V DC pulse wave

(

800

LED3

LED2

LED1

700

600

500

400

300

Resistance(k )

200

100

0 10 20 30 40 50 60 70 80 90 100 110 120

Temperature( )

Thermistor R100 = 13.36 kΩ ± 2% B constant = 4014 ± 2%

Rt = 13.36exp{4014( )}

273+t1373

3. Outdoor power P.C. board

OBH828

MXZ-3HA50VF

(+)

CN151 Signal transmission (To Outdoor control P.C. board)

15 V (-)

5 V DC pulse wave

(-) 15 V

Output to drive compressor

Connect to reactor (Red line)

Connect to reactor (White line)

CN171 Fin temperature thermistor (RT64)

CNDC Bus-bar voltage 290 - 370 V DC

Connect to earth

)

(

CN152 Signal Transmission

(+)

(From Outdoor Control P.C. board) 5 V DC pulse wave

Connect to earth

CNAC2 220-230-240 V AC Output

F1 FUSE T6.3AL250V

220-230-240 V AC Input

F2 FUSE T6.3AL250V

CNAC1 220-230-240 V AC Output

4. Outdoor display P.C. board

MXZ-2HA40VF MXZ-2HA50VF

To inverter P.C. board (CN936)

Fin temperature thermistor (RT64)

200

180

160

140

120

100

Resistance (kΩ)

0 10 20 30 40 50 60 70 80

Temperature

Thermistor R50 = 17 kΩ ± 2%

)

GND5V

LED2LED1

SW1

SW2

B constant = 4150 ± 3%

Rt = 17exp{4150( )}

273+t1323

(°C)

OBH828

DISASSEMBLY INSTRUCTIONS

The terminal which has the locking mechanism can be detached as shown below. There are following 2 types of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with the connector shown below

Sleeve

has the locking mechanism.

Slide the sleeve. Pull the terminal while

Locking lever

pushing the locking lever.

13-1. MXZ-2HA40VF MXZ-2HA50VF

NOTE: Turn OFF the power supply before disassembly.

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet and the panels

(1) Remove the screws fixing the service panel. (2) Pull down the service panel and remove it. (3) Disconnect the power supply and indoor/outdoor connect-

ing wire. (4) Remove the screws fixing the top panel. (5) Remove the top panel. (6) Remove the screws fixing the cabinet. (7) Remove the cabinet. (8) Remove the screws fixing the back panel. (9) Remove the back panel.

Photo 2

Photo 1

Hold the sleeve, and pull out the terminal slowly.

Connector

: Indicates the visible parts in the photos. : Indicates the invisible parts in the photos.

Screws of the top panel

Direction to remove

Screws of

the cabinet

Screws of the back panel

Photo 3

Hooks

Screws of Service panel

Screws of the back panel

OPERATING PROCEDURE PHOTOS

OBH828

2. Removing the inverter assembly and the inverter

P.C. board

(1) Remove the service panel, the top panel and the cabinet

(Refer to 1).

(2) Disconnect the power supply and indoor/outdoor connect-

ing wire and remove the back panel (Refer to section 1).

(3) Disconnect all connectors and lead wires on the inverter

P.C. board. (4) Remove the compressor connector (CNMC). (5) Remove the screws fixing the heat sink support and the

separator. (6) Remove the screws of the terminal block support and the

back panel. (Photo 2) (7) Remove the inverter assembly. (8) Remove the screw of the earth wire and screws of the ter-

minal block support. (9) Remove the hooks of the heat sink support and remove

the heat sink support from the P.C. board support. (

) Remove the screw fixing the inverter P.C. board and

remove the inverter P.C. board from the P.C. board sup-

port.

3. Removing the R.V. coil

(1) Remove the service panel, the top panel and the cabinet

(Refer to section 1).

(2) Disconnect the power supply and indoor/outdoor connect-

ing wire and remove the back panel (Refer to section 1).

(3) Remove the inverter assembly (Refer to section 2). (4) Remove the R.V. coil.

Photo 4

Screws of the heat sink support and the separator

Photo 5

Compressor

Reactor (ACL2)

connector

Inverter assembly

Screws of the terminal block support

4. Removing the discharge temperature thermistor, defrost thermistor and outdoor heat exchanger temperature thermistor

(1) Remove the service panel, the top panel and the cabinet (Refer to section 1). (2) Disconnect the power supply and indoor/outdoor connect-

ing wire and remove the back panel (Refer to section 1). (3) Remove the inverter assembly (Refer to section 2). (4) Pull out the discharge temperature thermistor from its

holder. (5) Pull out the defrost thermistor from its holder (Photo 7). (6) Pull out the outdoor heat exchanger temperature thermis-

tor from its holder (Photo 7).

P.C. board support

Hooks of the heat sink support

Photo 6

Discharge temperature thermistor (RT62)

Screw of the earth wire

Screw of the inverter

P.C. board

Reactor (ACL)

R.V. coil

OPERATING PROCEDURE PHOTOS

OBH828

5. Removing the outdoor fan motor

(1) Remove the service panel, the top panel and the cabinet

(Refer to section 1).

(2) Disconnect the power supply and indoor/outdoor connect-

ing wire. (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller fan nut. (5) Remove the propeller fan. (6) Remove the screws fixing the fan motor. (7) Remove the fan motor.

6. Removing the compressor and the 4-way valve

(1) Remove the service panel, the top panel and the cabinet (Refer to section 1).

(2) Disconnect the power supply and indoor/outdoor connect-

ing wire and remove the back panel (Refer to section 1). (3) Remove the inverter assembly (Refer to section 2). (4) Recover gas from the refrigerant circuit.

Photo 7

Outdoor heat exchanger temperature thermistor (RT68)

Photo 8

Screws of the fan motor

Defrost thermistor (RT61)

Base heater ( only)

NOTE: Recover gas from the pipes until the pressure gauge

shows 0 kg/cm

(5) Detach the brazed part of the suction and the discharge

pipe connected with compressor. (6) Remove the nuts of compressor legs. (7) Remove the compressor. (8) Detach the brazed part of pipes connected with 4-way

valve.

(0 MPa).

Photo 10

Discharge pipe brazed part

Suction pipe brazed part

Photo 9

Propeller fan

Propeller fan nut

Compressor nuts

Brazed parts of 4-way valve

13-2. MXZ-3HA50VF

OBH828

NOTE: Turn OFF the power supply before disassembly.

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet and the panels

(1) Remove the screws of the service panel, and remove the

service panel.

(2) Disconnect the power supply and indoor/outdoor connect-

ing wire.

(3) Remove the screws of the top panel, and remove the top

panel.

(4) Remove the screws of the cabinet, and remove the cabi-

net.

(5) Remove the screws of the back panel, and remove the

back panel (Photo 3).

Photo 3

Screw of the rear guard

Photo 1

Screws of the sub panel

Screws of the cabinet

Photo 2

Screws of the top panel

Screws of the cabinet

Screws of the top panel

Screws of the cabinet

Screws of service panel

Screws of the sub panel

Screws of the back panel

Screws of the cabinet

OPERATING PROCEDURE PHOTOS

OBH828

2. Removing the outdoor control P.C. board, the outdoor power P.C. board and the reactor

(1) Remove the service panel (Photo 1). (2) Disconnect the power supply and indoor/outdoor con-

necting wire.

(3) Remove the top panel, the cabinet, and the back panel

(Photo 1, 2, 3).

(4) Disconnect all connectors and lead wires on the outdoor

control P.C. board.

(5) Unhook the catches of the outdoor control P.C. board,

and remove the outdoor control P.C. board.

(6) Remove the screws of the electrical box assembly,

unhook the catches of the electrical box assembly, and remove the electrical box assembly.

(7) Remove the screws of outdoor control P.C. board holder,

and remove the outdoor control P.C. board holder.

(8) Remove the screws of the reactor, and remove the reac-

tor.

(9) Remove the screws of the reactor bed, and remove the

reactor bed.

(

) Remove the screws of the heat sink support, and remove

the heat sink support.

(

) Remove the screws fixing the outdoor power P.C. board.

(

) Disconnect all connectors and lead wires on the outdoor

power P.C. board.

Photo 4

Electrical box assembly

Screws of the electrical box assembly

Catch of the electrical box assembly

Photo 5

Catches of the outdoor control P.C. board

Photo 7

Screws of the outdoor power P.C. board

Screws of the outdoor control P.C. board holder

Photo 6

Screw of the heat sink support

Screw of the reactor bed

Screws of the reactor

Heat sink support

Screws of the outdoor control P.C. board holder

Screws of the reactor bed

OPERATING PROCEDURE PHOTOS

OBH828

3. Removing the fan motor

(1) Remove the service panel (Photo 1). (2) Disconnect the power supply and indoor/outdoor connect-

ing wire.

(3) Remove the top panel, the cabinet, and the back panel

(Photo 1, 2, 3).

(4) Disconnect connectors CN712, CNF1, CNTH1, CNTH2,

CN63H, CN791, CN792, CN793, CN797 on the outdoor control P.C. board and disconnect the relay connector of the compressor lead wire.

(5) Remove the screws of the electrical box assembly, and

remove the electrical box assembly (Photo 4). (6) Remove the propeller fan. (7) Remove the fan motor.

4. Removing the compressor and the 4-way valve

(1) Remove the service panel (Photo 1). (2) Disconnect the power supply and indoor/outdoor connect-

ing wire. (3) Remove the top panel, the cabinet, and the back panel

(Photo 1, 2, 3). (4) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure

gauge shows 0 kg/cm (5) Disconnect the outdoor control P.C. board connectors: CN712, CNF1, CNTH1, CNTH2, CN63H, CN791,CN792,

CN793, CN797. (6) Disconnect the compressor lead wire from the terminal of the compressor (U, V, W). (7) Remove the screws of the electrical box assembly, and

remove the electrical box assembly (Photo 4). (8) Remove the propeller fan. (9) Remove the sound proof felt *1, *2.

NOTE: Before removing the sound proof felt, remove

the hook-and-loop fastener of the top felt by the power receiver.

(

) Remove the screws of the separator, and remove the

separator. (

) Detach the brazed parts of the compressor suction and

discharge pipes. (

) Remove the compressor nuts and remove the compres-

sor. (

) Detach the brazed parts of the 4-way valve and pipe.

(0 MPa).

Photo 8

Propeller fan

Photo 9

Photo 10

R.V. coil

Screws of the outdoor fan motor

Propeller fan nut

4 way valve

Separator

Hook-and-loop fastener

Sound proof felt *1

LEV coil E

Expansion valve E

Discharge pipe brazed part

Suction pipe brazed part

Sound proof felt *2

Power receiver

Discharge temperature thermistor (RT62)

Compressor nuts

OPERATING PROCEDURE PHOTOS

5. Removing the expansion valve

(1) Remove the service panel (Photo 1). (2) Remove the top panel, the cabinet, and the back

panel (Photo 1, 2, 3).

(Gas recovery is not required if the unit is pumped

down.)

(3)

Remove the electrical parts for removing LEV R (Photo 4,

8). (4) Remove the LEV coils. (5) Detach the brazed parts of expansion valves and

pipes.

Photo 11

R.V. coil

Photo 12

Outdoor heat exchanger temperature thermistor (RT68)

4-way valve

Brazed parts

Ambient temperature thermistor (RT65)

LEV coils

Defrost thermistor (RT61)

HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Published: Dec. 2018. No.OBH828 Made in Japan Specifications are subject to change without notice.

Expansion valves

Mitsubishi MXZ-2HA50VF, MXZ-2HA40VF, MXZ-3HA50VF User guide

Specifications and Main Features

Frequently Asked Questions

User Manual