Mitsubishi MXZ-2F53VF, MXZ-2F33VF, MXZ-2F42VF-ET1, MXZ-2F42VF-E1, MXZ-2F53VF-E1 Service Manual

Models

MXZ-2F33VF

-

E1,

ET1

MXZ-2F42VF

-

E1,

ET1

MXZ-2F53VF

-

E1,

ET1

MXZ-2F53VFH

-

E1

MXZ-3F54VF

-

E1,

ET1

MXZ-3F68VF

-

E1,

ET1

MXZ-4F72VF

-

E1,

ET1

HFC

utilized

R32

SERVICE MANUAL

No. OBH790

OUTDOOR UNIT

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

PARTS CATALOG (OBB790)

Indoor unit service manual MSZ-LN•VG Series (OBH766) MSZ-EF•VG Series (OBH589) MSZ-AP•VF Series (OBH799) MSZ-AP•VG Series (OBH788) MLZ-KP•VF Series (OBH801) SLZ-M•FA Series SEZ-M•DA Series PCA-M•KA Series (OCH659) PEAD-M•JA(L) Series (HWE16130)

CONTENTS

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

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

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

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

5. NOISE CRITERIA CURVES ···························· 20

6. OUTLINES AND DIMENSIONS ······················ 22

7. WIRING DIAGRAM ·········································· 25

8. REFRIGERANT SYSTEM DIAGRAM ·············29

9. PERFORMANCE CURVES ····························· 35

10. ACTUATOR CONTROL ··································· 56

11. SERVICE FUNCTIONS ···································· 57

12. TROUBLESHOOTING ····································· 61

13. DISASSEMBLY INSTRUCTIONS ···················· 86

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

2

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.

Use the speciﬁ ed refrigerant only

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.

OBH790

3

TECHNICAL CHANGES

1

MXZ-2F33VF -E1,

ET1

MXZ-2F42VF -E1,

ET1

MXZ-2F53VF -E1,

ET1

MXZ-2F53VFH -

E1

MXZ-3F54VF -E1,

ET1

MXZ-3F68VF -E1,

ET1

MXZ-4F72VF -E1,

ET1

1. New model

2-1. ALWAYS OBSERVE FOR SAFETY

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

2

SAFETY PRECAUTION

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R32

Preparation before the repair service.

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Precautions during the repair service.

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Use new refrigerant pipes.

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Use a vacuum pump with a reverse flow check valve.

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MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT

WARNING

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

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.

OBH790

4

Make sure that the inside and outside of refrigerant 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.

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 following tools specifically designed for use with R32 refrigerant.

The following tools are necessary to use R32 refrigerant.

Flare tool

Electronic refrigerant charging scale

Vacuum pump adaptor

Size adjustment gauge

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R32

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

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.

Use the specified refrigerant only.

OBH790

5

[1] Warning for service

(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 without a siphon tube >< Cylinder with a siphon tube >

Charging liquid refrigerant

Cylinder

Liquid

Valve

Liquid

Valve

OBH790

6

[4] Cautions for unit using R32 refrigerant

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.

OBH790

7

(3) Repair to intrinsically Safe Components

Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible 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 the system, it shall be pressure-tested with the appropriate purging gas. The system shall be leaktested 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.

OBH790

8

b) Isolate system electrically. c) 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. d) 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).

i) 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.

OBH790

9

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

(1) Flowchart

[5] Service tools

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

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

Adaptor for reverse flow check

· Attach on vacuum pump.

Refrigerant charge base

—

Refrigerant cylinder · Only for R32

· Cylinder with syphon

Refrigerant recovery equipment

—

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

• If the diameter of the existing pipes is different from the speciﬁ ed diameter, refer to technological data materials to conﬁ rm if the pipes can be used.

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

Measure the existing pipe thickness and check for damage.

The existing pipe thickness meets speciﬁ ca- tions 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.

Test run

The existing pipes cannot be reused. Use new pipes.

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

Use new pipes for MXZ-3F/4F models.

The existing pipe thickness does not meet speciﬁ cations or the pipes are damaged.

OBH790

10

(2) Cautions for refrigerant piping work

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.)

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.

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

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

3/4

6.35

9.52

12.70

15.88

19.05

0.8

1.0

—

0.8

1.0

Nominal

dimensions(inch)

Diagram below: Piping diameter and thickness

Outside

diameter

(mm)

Thickness

(mm)

R32/R410a R22

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

6.35

9.52

12.70

15.88

19.05

9.1

13.2

16.6

19.7

—

9.0

13.0

16.2

19.4

23.3

Nominal

dimensions(inch)

Flare cutting dimensions

Outside

diameter(mm)

R32/R410a R22

Dimension A

( )

+0

-0.4

(mm)

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

6.35

9.52

12.70

15.88

19.05

17.0

22.0

26.0

29.0 *

—

17.0

22.0

24.0

27.0

36.0

Nominal

dimensions(inch)

Flare nut dimensions

Outside

diameter(mm)

Dimension B

R32/R410a

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

R22

(mm)

Dimension A

Dimension B

Tools and materials Use R32 tools Can R22 tools be used?

Can R407C tools be used?

Can R410a tools be used?

Gauge manifold Air purge, refrigerant

charge and operation check

Tool exclusive for R32

Charge hose

Tool exclusive for R32

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

equipment

Refrigerant recovery Tool exclusive for R32

Refrigerant cylinder Refrigerant charge Tool exclusive for R32 Safety charger

Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant

Tool exclusive for R32

Charge valve

Prevent gas from blowing out when detaching charge hose

Tool exclusive for R32

Vacuum pump

Vacuum drying and air purge

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

(Usable if equipped with

adapter for reverse ﬂ ow)

(Usable if equipped with

adapter for reverse ﬂ ow)

(Usable if equipped with

adapter for reverse ﬂ ow)

Flare tool

Flaring work of piping

Tools for other refrigerants can be used by adjusting ﬂ aring dimension

(Usable by adjusting

ﬂ aring dimension)

(Usable by adjusting

ﬂ aring dimension)

(Usable by adjusting

ﬂ aring dimension)

Bender

Bend the pipes

Tools for other refrigerants can be used

Pipe cutter

Cut the pipes

Tools for other refrigerants can be used

Welder and nitrogen gas cylinder

Weld the pipes

Tools for other refrigerants can be used

Refrigerant charging scale

Refrigerant charge

Tools for other refrigerants can be used

Vacuum gauge or thermistor vacuum gauge and vacuum valve

Check the degree of vacuum. (Vacuum valve prevents back ﬂ ow of oil and refrigerant to thermistor vacuum gauge)

Tools for other refrigerants can be used

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.

OBH790

11

2-4. CHOOSING THE OUTDOOR UNIT INSTALLATION LOCATION

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).

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

OK OK

OK NG

Amin

Height from the bottom of

0.125 [m] or less

Height from the bottom of

0.125 [m] or less

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

OBH790

12

C) Create an appropriate ventilation open area.

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.

■ 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.

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

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

h0

1.8 [m]

Ceiling concealedCassetteCeiling suspended

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

OBH790

13

PART NAMES AND FUNCTIONS

3

ACCESSORIES

Model

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

Drain socket 1 1 Drain cap - 2

Air outlet

Drain outlet

Air inlet

(Back and side)

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

Air inlet

Air outlet

Drain outlet

Piping Drain hose

(Back and side)

OBH790

14

SPECIFICATION

4

Outdoor model MXZ-2F33VF Outdoor unit power supply

Single phase

220 - 230 - 240 V, 50 Hz

System

Indoor units number 2 Piping total length m Max. 20 Connecting pipe length m Max. 15 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.)

2 kW 3.3 (1.1 - 3.8) 4.0 (1.0 - 4.1)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 850 910 Running current (Total)

1, 2 A 4.3 - 4.1 - 3.9 4.6 - 4.4 - 4.2

Power factor (Total)

1, 2% 90

Starting current (Total)

1, 2 A 4.6

Coefﬁ cient of performance (C.O.P) (Total)

1, 2 3.88 4.40

Compressor

Model KVB073FYXMC

Output W 470

Current

1, 2 A 3.8

Refrigeration oil (Model) L 0.27 (FW68S)

Fan

motor

Model RC0J50-FA

Current

1, 2 A 0.35 Dimensions W x H x D mm 800 x 550 x 285 Weight kg 33

Special

remarks

Air ﬂ ow (Rated) m3 /h 1,890 1,938 Sound level (Rated) dB(A) 49 50 Fan speed (Rated) rpm 860 880 Pre-charged refrigerant quantity (R32) kg 1.0 Max refrigerant quantity (R32) kg 1.0

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-AP15VF + MSZ-LN18VG 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

OBH790

15

Outdoor model MXZ-2F42VF Outdoor unit power supply

Single phase

220 - 230 - 240 V, 50 Hz

System

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.)

2 kW 4.2 (1.1 - 4.4) 4.5 (1.0 - 4.8)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 980 880 Running current (Total)

1, 2 A 4.9 - 4.7 - 4.5 4.4 - 4.3 - 4.1

Power factor (Total)

1, 2% 90

Starting current (Total)

1, 2 A 7.6

Coefﬁ cient of performance (C.O.P) (Total)

1, 2 4.29 5.11

Compressor

Model SVB130FBBMT

Output W 1,100

Current

1, 2 A 3.99

Refrigeration oil (Model) L 0.35 (FW68S)

Fan

motor

Model RC0J50-FA

Current

1, 2 A 0.35 Dimensions W x H x D mm 800 x 550 x 285 Weight kg 37

Special

remarks

Air ﬂ ow (Rated) m3 /h 1,704 2,010 Sound level (Rated) dB(A) 44 50 Fan speed (Rated) rpm 780 910 Pre-charged refrigerant quantity (R32) kg 1.2 Max refrigerant quantity (R32) kg 1.2

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-LN18VG + MSZ-LN25VG 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

OBH790

16

Outdoor model MXZ-2F53VF MXZ-2F53VFH

Outdoor unit power supply

Single phase

220 - 230 - 240 V, 50 Hz

System

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.)

2 kW 5.3 (1.1 - 5.6) 6.4 (1.0 - 7.0)

Breaker capacity A 15

Electrical

data

Power input (Total) 1, 2 W 1,400 1,560 Running current (Total)

1, 2 A 6.5 - 6.2 - 6.0 7.5 - 7.1 - 6.8

Power factor (Total)

1, 2 % 97.5 95

Starting current (Total)

1, 2 A 7.6

Coefﬁ cient of performance (C.O.P) (Total)

1, 2 3.79 4.10

Compressor

Model SVB130FBBMT

Output W 1,400

Current

1, 2 A 6.59

Refrigeration oil (Model) L 0.35 (FW68S)

Fan

motor

Model RC0J50-FA

Current

1, 2 A 0.35 Dimensions W x H x D mm 800 x 550 x 285 Weight kg MXZ-2F53VF: 37 MXZ-2F53VFH: 38

Special

remarks

Air ﬂ ow (Rated) m3 /h 1,962 2,082 Sound level (Rated) dB(A) 46 51 Fan speed (Rated) rpm 890 940 Pre-charged refrigerant quantity (R32) kg 1.2 Max refrigerant quantity (R32) kg 1.2

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-LN18VG + MSZ-LN35VG 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

OBH790

17

Outdoor model MXZ-3F54VF Outdoor unit power supply

Single phase

220 - 230 - 240 V, 50 Hz

System

Indoor units number 2 to 3 Piping total length m Max. 50 Connecting pipe length m Max. 25 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.)

2 kW 5.4 (2.9 - 6.8) 7.0 (2.6 - 9.0)

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 1,320 1,400 Running current (Total)

1, 2 A 6.0 - 5.7 - 5.5 6.4 - 6.1 - 5.9

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 6.7

Coefﬁ cient of performance (C.O.P) (Total)

1, 2 4.09 5.00

Compressor

Model SVB130FBBM1T

Output W 1,400

Current

1, 2 A 5.06

Refrigeration oil (Model) L 0.6 (FW68S)

Fan

motor

Model SIC-82FX-F764-1

Current

1, 2 A 0.5 Dimensions W x H x D mm 840 x 710 x 330 Weight kg 57

Special

remarks

Air ﬂ ow (Rated) m3 /h 1,860 1,632 Sound level (Rated) dB(A) 46 50 Fan speed (Rated) rpm 600 560 Pre-charged refrigerant quantity (R32) kg 1.4 Max refrigerant quantity (R32) kg 2.4

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-LN18VG + MSZ-LN18VG + MSZ-LN18VG 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

OBH790

18

Outdoor model MXZ-3F68VF

Outdoor unit power supply

Single phase

220 - 230 - 240 V, 50 Hz

System

Indoor units number 2 to 3

Piping total length m Max. 60 Connecting pipe length m Max. 25 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.)

2 kW 6.8 (2.9 - 8.4) 8.6 (2.6 - 10.6)

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 1,840 1,910 Running current (Total)

1, 2 A 8.4 - 8.0 - 7.7 8.8 - 8.4 - 8.0

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 10.1

Coefﬁ cient of performance (C.O.P) (Total)

1, 2 3.70 4.50

Compressor

Model SVB172FCKM1T

Output W 1,800

Current

1, 2 A 8.58

Refrigeration oil (Model) L 0.6 (FW68S)

Fan

motor

Model SIC-82FX-F764-1

Current

1, 2 A 0.5 Dimensions W x H x D mm 840 x 710 x 330 Weight kg 57

Special

remarks

Air ﬂ ow (Rated) m3 /h 2,124 2,376 Sound level (Rated) dB(A) 48 53 Fan speed (Rated) rpm 650 700 Pre-charged refrigerant quantity (R32) kg 1.4 Max refrigerant quantity (R32) kg 2.4

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-LN18VG + MSZ-LN25VG + MSZ-LN25VG 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

OBH790

19

Outdoor model MXZ-4F72VF Outdoor unit power supply

Single phase

220 - 230 - 240 V, 50 Hz

System

Indoor units number 2 to 4 Piping total length m Max. 60 Connecting pipe length m Max. 25 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.)

2 kW 7.2 (3.7 - 8.8) 8.6 (3.4 - 10.7)

Breaker capacity A 25

Electrical

data

Power input (Total) 1, 2 W 1,850 1,870 Running current (Total)

1, 2 A 8.5 - 8.1 - 7.8 8.6 - 8.2 - 7.9

Power factor (Total)

1, 2% 99

Starting current (Total)

1, 2 A 10.1

Coefﬁ cient of performance (C.O.P) (Total)

1, 2 3.89 4.60

Compressor

Model SVB172FCKM1T

Output W 2,000

Current

1, 2 A 6.98

Refrigeration oil (Model) L 0.6 (FW68S)

Fan

motor

Model SIC-82FX-F764-1

Current

1, 2 A 0.5 Dimensions W x H x D mm 840 x 710 x 330 Weight kg 58

Special

remarks

Air ﬂ ow (Rated) m3 /h 2,124 2,562 Sound level (Rated) dB(A) 48 54 Fan speed (Rated) rpm 650 740 Pre-charged refrigerant quantity (R32) kg 1.4 Max refrigerant quantity (R32) kg 2.4

1 Measured under rated operating frequency.

2 When connected with indoor units below. MSZ-LN18VG + MSZ-LN18VG + MSZ-LN18VG + MSZ-LN18VG 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

OBH790

20

NOISE CRITERIA CURVES

5

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

44

SPL(dB(A))50LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

49

SPL(dB(A))50LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

46

SPL(dB(A))51LINE

MXZ-2F53VF MXZ-2F53VFH

MXZ-2F33VF MXZ-2F42VF

OBH790

21

OUTDOOR UNIT

MICROPHONE

1m

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

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

46

SPL(dB(A))50LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

48

SPL(dB(A))53LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

48

SPL(dB(A))54LINE

MXZ-3F54VF MXZ-3F68VF

MXZ-4F72VF

OBH790

22

OUTLINES AND DIMENSIONS

6

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

Unit: mm

OBH790

23

1.Installation space

Note : Leave front and both sides free of obstruction.

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

500 or more

100 or more

Note : Leave front and overhead free of obstruction.

100 or more

350 or more

200 or more

500 or more

2.Service space

100 or more

500 or more

350 or more

100 or more

Service space

MXZ-3F54VF MXZ-3F68VF

Unit: mm

OBH790

24

1.Installation space

Note : Leave front and both sides free of obstruction.

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

500 or more

100 or more

Note : Leave front and overhead free of obstruction.

100 or more

350 or more

200 or more

500 or more

2.Service space

100 or more

500 or more

350 or more

100 or more

Service space

MXZ-4F72VF

Unit: mm

OBH790

25

WIRING DIAGRAM

7

MXZ-2F33VF -

E1

,

ET1

MXZ-2F42VF -E1,

ET1

MXZ-2F53VF -

E1, ET1

OBH790

26

MXZ-2F53VFH -

E1

OBH790

27

MXZ-3F54VF -E1,

ET1

MXZ-3F68VF -E1,

ET1

OBH790

28

MXZ-4F72VF -E1,

ET1

OBH790

29

REFRIGERANT SYSTEM DIAGRAM

8

a

b

Outdoor unit

Indoor units

10 m

Max. Height difference

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Defrost thermistor RT61

Muffler

4-way valve

Indoor unit

A

Indoor unit

B

Indoor unit

A

Indoor unit

B

Capillary tube

Strainer #100

Stop valve

(with strainer #100)

R.V. coil OFF ON

Refrigerant flow in cooling Refrigerant flow in heating

Ambient temperature thermistor RT65

Outdoor heat exchanger temperature thermistor RT68

FAN-OUT

HEX-OUT

Discharge temperature thermistor RT62

Stop valve (with service port)

Sub muffler

UNIT: mm

MXZ-2F33VF

UNIT: mm (inch)

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

MAX REFRIGERANT PIPING LENGTH

Piping length each indoor unit (a, b) 15 m

Total piping length (a+b) 20 m

Bending point for each unit 15

Total bending point 20

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 2 unit total)

20 m

1,000 0

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table. .

OBH790

30

Stop valve

(with strainer #100)

LEV A

LEV B

Compressor

Defrost thermistor RT61

Distributor

Muffler

4-way valve

Indoor unit

A

Indoor unit

B

Indoor unit

A

Indoor unit

B

Capillary tube

Strainer #100

Stop valve

(with strainer #100)

R.V. coil OFF ON

Refrigerant flow in cooling Refrigerant flow in heating

Ambient temperature thermistor RT65

Outdoor heat exchanger temperature thermistor RT68

FAN-OUT

HEX-OUT

Discharge temperature thermistor RT62

Stop valve (with service port)

Sub muffler

UNIT: mm

MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

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.

a

b

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height dif

ference

UNIT: mm (inch)

Outdoor unit union diameter For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 2 unit total)

30 m

1,200 0

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

For MXZ-2F53VF and MXZ-2F53VFH, when diameter of refriger-

ant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS

CATALOG"

OBH790

31

Strainer #100

Power

receiver

LEV A

LEV B

LEV C

Oil separator

Compressor

Defrost thermistor RT61

Distributor

Muffler

4-way valve

LEV E

Indoor unit

A

Indoor unit

B

Indoor unit

C

Indoor unit

A

Indoor unit

B

Indoor unit

C

Capillary tube

Charge pipe

Capillary tube

Discharge temperature

thermistor RT62

Strainer #100

R.V. coil OFF ON

Refrigerant flow in cooling Refrigerant flow in heating

Ambient temperature thermistor RT65

Outdoor heat exchanger temperature thermistor RT68

FAN-OUT

HEX-OUT

Strainer #100

Stop valve with service port

Stop valve

High-pressure switch

UNIT: mm (inch)

UNIT: mm

MXZ-3F54VF

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

a

b

c

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height difference

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.

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

When diameter of refrigerant pipe is different from that of outdoor

unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS

CATALOG".

ADDITIONAL REFRIGERANT CHARGE

Refer to "Method of charging refrigerant".

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 3 unit total)

50 m

1,400 0

OBH790

32

Strainer #100

Power

receiver

LEV A

LEV B

LEV C

Oil separator

Compressor

Defrost thermistor RT61

Distributor

Muffler

4-way valve

LEV E

Indoor unit

A

Indoor unit

B

Indoor unit

C

Indoor unit

A

Indoor unit

B

Indoor unit

C

Capillary tube

Discharge temperature thermistor RT62

Strainer #100

R.V. coil OFF ON

Refrigerant flow in cooling Refrigerant flow in heating

Ambient temperature thermistor RT65

Outdoor heat exchanger temperature thermistor RT68

FAN-OUT

HEX-OUT

Strainer #100

Stop valve with service port

Stop valve

High-pressure switch

Charge pipe

UNIT: mm

MXZ-3F68VF

a

b

c

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height difference

MAX REFRIGERANT PIPING LENGTH

Piping length each indoor unit (a, b, c) 25 m Total piping length (a+b+c) 60 m Bending point for each unit 25 Total bending point 60

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Refer to "Method of charging refrigerant".

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 3 unit total)

60 m

1,400 0

UNIT: mm (inch)

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

When diameter of refrigerant pipe is different from that of outdoor

unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS

CATALOG".

OBH790

33

MXZ-4F72VF

Indoor unit

A

Power

receiver

LEV A

LEV B

LEV C

LEV D

Oil separator

Compressor

Muffler

4-way valve

LEV E

Indoor unit

B

Indoor unit

C

Indoor unit

D

Indoor unit

A

Indoor unit

B

Indoor unit

C

Indoor unit

D

Capillary tube

Discharge temperature thermistor RT62

Strainer #100

R.V. coil OFF ON

Refrigerant flow in cooling Refrigerant flow in heating

Distributor

HEX-OUT

Outdoor heat exchanger temperature thermistor RT68

Defrost thermistor RT61

Capillary tube

Ambient temperature thermistor RT65

FAN-OUT

Strainer #100

Stop valve with service port

Stop valve

High-pressure switch

Charge pipe

UNIT: mm

a

b

c

d

Outdoor unit

Indoor units

15 m

10 m

15 m

Max. Height difference

UNIT: mm (inch)

Outdoor unit union diameter

For

Indoor unit A

Liquid 6.35(1/4)

Gas 12.7(1/2)

Indoor unit B

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit C

Liquid 6.35(1/4)

Gas 9.52(3/8)

Indoor unit D

Liquid 6.35(1/4)

Gas 9.52(3/8)

Refrigerant pipe diameter is different according to indoor unit to be

connected. When using extension pipes, refer to the right table.

When diameter of refrigerant pipe is different from that of outdoor

unit union, use optional Different-diameter pipe.

For further information on Different-diameter pipe, refer to "PARTS

CATALOG".

MAX REFRIGERANT PIPING LENGTH

Piping length each indoor unit (a, b, c, d) 25 m

Total piping length (a+b+c+d)

60 m Bending point for each unit 25 Total bending point 60

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Refer to "Method of charging refrigerant".

Outdoor unit

precharged

(g)

Refrigerant piping length (one way, 4 unit total)

60 m

1,400 0

OBH790

34

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

0.05 to 0 MPa [Gauge] (ap-

proximately 0.5 to 0 kgf/cm²)

, or the protection function may operate due to the pressure increase in the high pressure refrigerant 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.

Method of Charging refrigerant

ŶMXZ-3F54VF/3F68VF/4F72VF

PipingConnectionIndoor unit

+=

number *1

+

of speci¿c I/U *2

+

length

0.0 kg

k g______k g______1.4 kggk______

ŶMXZ-2F42VF/2F53VF/2F53VFH

Piping

+

=

length

1.2 kg1.2 kg

0.0 kg

ŶMXZ-2F33VF

Piping

+

=

length

1.0 kg1.0 kg

0.0 kg

*1:If you connect indoor unit number 3 or 4 units, please add to charge refrigetrant amount 0.5kg *2:If you connect specific indoor unit(s), please add to charge refrigetrant amount 0.17kg per 1unit

Specific indoor unit is following: MSZ-LN18/25/35VG MLZ-KP25/35/50VF

SEZ-M50DA(L) PCA-M50/60KA PEAD-M50JA(L)Q

*3: In case total refrigerant amount exceed 2.4kg depending on combination, please charge only 1.0kg for maximum.

Pre charge

Total

refrigerant

Total

refrigerant *3

Pre charge

Total

refrigerant

Pre charge

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.

WARNING

PUMPING DOWN

OBH790

35

PERFORMANCE CURVES

9

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.

INDOOR UNIT

OUTDOOR UNIT

}

Cooling

Heating

Wet and dry bulb thermometers

BACK VIEW

Wet and dry bulb thermometers

FRONT VIEW

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

OBH790

36

9-1. CAPACITY AND THE INPUT CURVES

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

Cooling capacity

Capacity correction factors

1.4

0.9

1.0

1.1

1.2

1.3

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

22 20 18

46-5 5 10 20 25 35 40

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

46-5 5 10 20 25 35 40

Total input (Cooling)

Input correction factors

1.4

0.9

0.8

0.7

1.0

1.1

1.2

1.3

22 20 18

26

24

26

24

22 class

5.2

4.8

4.4

4.0

3.6

3.2

2.8

2.4

5.8

5.4

4.9

4.5

4.0

3.6

3.2

2.8

5.9

5.5

5.0

4.6

4.1

3.7

3.2

2.8

4.1

3.8

3.5

3.2

2.9

2.6

2.3

2.0

8.7

8.0

7.3

6.6

5.9

5.3

4.6

4.0

35 class

11.1

10.2

9.3

8.3

7.5

6.6

5.8

5.0

42 class

12.8

11.6

10.5

9.5

8.5

7.5

6.6

5.6

50 class

25 class

15 class

18 class

7.4

6.8

6.2

5.7

5.1

4.5

4.0

3.5

20 class

(MXZ-2F53)

(MXZ-2F42/53)

(

MXZ-2F53)

Indoor air Wet-bulb temperature

difference (°C)

Indoor intake air Wet-bulb temperature (°C)

-16 -8 -4 4 12 16

Capacity correction factors

Outdoor intake air Wet

-

bulb temperature (

ºC

)

15

20 26

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

0.5

0.4

Outdoor intake air Wet

-

Heating capacity

1.4

-12 0 8 18

-16 -8 -4 4 12 16

Outdoor intake air Wet

-

bulb temperature (

ºC

)

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

0.5

0.4

Outdoor intake air Wet

-

1.4

-12 0 8 18

26 20 15

Input correction factors

Total input (Heating)

26 20 15

Indoor intake air Dry-bulb temperature (°C)

22 class

25 class

35 class

42 class

(MXZ-2F53)

(MXZ-2F42/53)

50 class

(

MXZ-2F53)

15 class

18 class

20 class

Indoor air Dry-bulb temperature

difference (°C)

17.6

16.3

15.1

13.8

12.6

11.3

10.1

8.8

7.5

6.3

5.0

19.5

18.1

16.7

15.3

13.9

12.6

11.2

9.8

8.4

7.0

5.6

21.2

19.7

18.2

16.7

15.2

13.6

12.1

10.6

9.1

7.6

6.1

19.5

18.1

16.7

15.3

13.9

12.6

11.2

9.8

8.4

7.0

5.6

21.3

19.8

18.3

16.7

15.2

13.7

12.2

10.7

9.1

7.6

6.1

22.2

20.6

19.0

17.4

15.8

14.3

12.7

11.1

9.5

7.9

6.3

26.6

24.7

22.8

20.9

19.0

17.1

15.2

13.3

11.4

9.5

7.6

26.7

24.8

22.9

21.0

19.1

17.1

15.2

13.3

11.4

9.5

7.6

OBH790

37

0.9

1.0

1.1

1.2

1.3

1.4

0.8

-10 0 15

30

45 46

Capacity correction factors

Outdoor intake air Dry

- bulb temperature (

)

Cooling capacity

ºC

0.7

-5 5 10 20 25 35 40

-10 0 15

30

45 46

Outdoor intake air Dry

- bulb temperature (

)

ºC

-5 5 10 20 25 35 40

Input correction factors

Total input (Cooling)

0.9

1.0

1.1

1.2

1.3

1.4

0.8

0.7

0.6

0.5

0.4

18 16

19

22 20

24

26

18

16

19

22

20

24 26

Indoor air Wet-bulb temperature

difference (°C)

22 class

5.8

5.4

4.9

4.5

4.0

3.6

3.2

2.8

4.1

3.8

3.5

3.2

2.9

2.6

2.3

2.0

7.4

6.8

6.2

5.7

5.1

4.5

4.0

3.5

5.2

4.8

4.4

4.0

3.6

3.2

2.8

2.4

5.9

5.5

5.0

4.6

4.1

3.7

3.2

2.8

8.7

8.0

7.3

6.6

5.9

5.3

4.6

4.0

11.1

10.2

9.3

8.3

7.5

6.6

5.8

5.0

12.8

11.6

10.5

9.5

8.5

7.5

6.6

5.6

8.7

8.0

7.3

6.6

5.9

5.3

4.6

4.0

60 class

50 class

35 class

42 class

25 class

15 class

18 class

20 class

Indoor intake air Wet-bulb temperature (°C)

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

-16 -8 -4 4 12 18

Capacity correction factors

Outdoor intake air Wet

-

bulb temperature (

ºC

)

Heating capacity

15

20

26

1.4

0.5

0.4

-12 0 8 16

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

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

0.5

0.4

Input correction factors

Total input (Heating)

26

20

15

Outdoor intake air Wet

-

bulb temperature (

ºC

)

22 class

25 class

60 class

35 class

50 class

42 class

15 class

18 class

20 class

17.6

16.3

15.1

13.8

12.6

11.3

10.1

8.8

7.5

6.3

5.0

19.5

18.1

16.7

15.3

13.9

12.6

11.2

9.8

8.4

7.0

5.6

21.2

19.7

18.2

16.7

15.2

13.6

12.1

10.6

9.1

7.6

6.1

19.5

18.1

16.7

15.3

13.9

12.6

11.2

9.8

8.4

7.0

5.6

21.3

19.8

18.3

16.7

15.2

13.7

12.2

10.7

9.1

7.6

6.1

22.2

20.6

19.0

17.4

15.8

14.3

12.7

11.1

9.5

7.9

6.3

29.9

27.8

25.7

23.5

21.4

19.2

17.1

15.0

12.8

10.7

8.6

38.4

35.7

32.9

30.2

27.4

24.7

21.9

19.2

16.5

13.7

11.0

30.9

28.7

26.5

24.3

22.1

19.9

17.7

15.5

13.2

11.0

8.8

Indoor air Dry-bulb temperature

difference (°C)

Indoor intake air Dry-bulb temperature (°C)

OBH790

38

15-class unit

<COOL>Capacity

Frequency

Hz

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

2.5

3.0

<

HEAT>Total i

npu

t

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

3.0

<COOL>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

2.5

050100150

0.5

1.0

1.5

2.0

2.5

3.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

3.0

<COOL>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity <HEAT>Total input

Frequency

Hz

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

<HEAT>Total input

Frequency

Hz

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

2.5

9-2. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY (single operation) MXZ-2F33VF

20-class unit

22-class unit

25-class unit

18-class unit

OBH790

39

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

2.5

3.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

050100150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

1.0

2.0

3.0

4.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

15-class unit

20-class unit

22-class unit

25-class unit

MXZ-2F42VF

18-class unit

OBH790

40

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

3.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Fre

q

uenc

y

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Fre

q

uenc

y

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

1.0

2.0

3.0

4.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Fre

q

uenc

y

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Fre

q

uenc

y

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-2F53VF MXZ-2F53VFH

15-class unit

18-class unit

20-class unit

22-class unit

35-class unit

MXZ-2F42VF

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

050100150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

OBH790

41

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

25-class unit

35-class unit

42-class unit

50-class unit

MXZ-2F53VF MXZ-2F53VFH

OBH790

42

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

1.0

2.0

3.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-3F54VF 15-class unit

22-class unit

18-class unit

20-class unit

OBH790

43

25-class unit

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-3F54VF

35-class unit

42-class unit

50-class unit

OBH790

44

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

1.0

2.0

3.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-3F68VF

15-class unit

22-class unit

25-class unit

20-class unit

18-class unit

OBH790

45

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

MXZ-3F68VF

35-class unit

42-class unit

50-class unit

60-class unit

OBH790

46

MXZ-4F72VF

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

0.5

1.0

1.5

2.0

2.5

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

2.5

0 50 100 150

1.0

2.0

3.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

15-class unit

22-class unit

25-class unit

20-class unit

18-class unit

OBH790

47

MXZ-4F72VF

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

2.0

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<COOL>Total input

Frequency

Hz

<COOL>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<COOL>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

2.0

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

<HEAT>Capacity

Frequency

Hz

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

<HEAT>Total input

Frequency

Hz

35-class unit

42-class unit

50-class unit

60-class unit

OBH790

48

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.

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

Both indoor and outdoor units are under the

same temperature/humidity condition.

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

Dry-bulb temperature (

)

Relative humidity (%)

20

50

25

60

30 70

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/cm2 [Gauge])

(1) COOL operation

MXZ-2F33VF

15-class unit

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

(°C)

48Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

(°C)

48Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

48Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

0

1

2

3

4

5

22-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

48Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

0

1

2

3

4

5

25-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

48Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

0

1

2

3

4

5

OBH790

49

MXZ-2F42VF

15-class unit

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

22-class unit

25-class unit 35-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

Ambient temperature ( ) Ambient humidit

y (%)

50 60

70

(%)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

Ambient temperature ( ) Ambient humidit

y (%)

50 60

70

(%)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

OBH790

50

MXZ-2F53VF MXZ-2F53VFH

15-class unit

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

22-class unit

25-class unit 35-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

Ambient temperature ( ) Ambient humidit

y (%)

50 60

70

(%)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

Ambient temperature ( ) Ambient humidit

y (%)

50 60

70

(%)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

42-class unit 50-class unit

OBH790

51

15-class unit

MXZ-3F54VF

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

22-class unit 20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

25-class unit 35-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

42-class unit 50-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

40Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

MXZ-3F54VF

OBH790

52

15-class unit

MXZ-3F68VF MXZ-4F72VF

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

18-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

20-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

12

11

10

9

8

7

6

15 20 25 30 35

0.6

0.7

0.8

0.9

1.0

1.1

1.2

15 20 25 30 35

1

2

3

4

5

6

22-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

13

12

11

10

9

8

7

15 20 25 30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20 25 30 35

1

2

3

4

5

6

42-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

50-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

25-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

35-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

(°C)

50 60

70

(%)

(°C)

30Hz

14

13

12

11

10

9

8

15 20 25 30 35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

OBH790

53

MXZ-3F68VF MXZ-4F72VF

60-class unit

Outdoor low pressure

(MPa[Gauge])

Outdoor unit current (A)

Ambient temperature ( ) Ambient humidity (%)

50 60

70

(%)

50 60

70

(%)

30Hz

14

13

12

11

10

9

8

15 20 25 30

35

0.8

0.9

1.0

1.1

1.2

1.3

1.4

15 20 25 30 35

1

2

3

4

5

6

Condition :

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

(2) HEAT operation

Dry bulb temperature (°C)

Indoor

20.0

14.5

2

1

Outdoor

7

6

151220.0

14.5

Wet bulb temperature (°C)

MXZ-2F33VF

15-class unit

25-class unit

20-class unit

22-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

18-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

58Hz

Outdoor unit current (A)

OBH790

54

MXZ-2F42VF

15-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

20-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

22-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

25-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

35-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

18-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

25-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

35-class unit 42-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

50-class unit

15-class unit 20-class unit 22-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

18-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

34Hz

Outdoor unit current (A)

MXZ-2F53VF MXZ-2F53VFH

OBH790

55

22-class unit

50-class unit 25-class unit

MXZ-3F54VF 15-class unit

20-class unit

42-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

18-class unit

35-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

48Hz

Outdoor unit current (A)

22-class unit

25-class unit 35-class unit

MXZ-3F68VF MXZ-4F72VF

42-class unit

50-class unit

15-class unit

20-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

18-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

60-class unit

0 5 10 15 20 25

2

3

4

5

6

7

Ambient temperature ( )

36Hz

Outdoor unit current (A)

OBH790

56

ACTUATOR CONTROL

10

Relation between main sensor and actuator

Sensor Purpose

Actuator

Compressor LEV

Outdoor

fan motor

4-way

valve

Discharge temperature thermistor

Protection

Indoor coil temperature thermistor

Cooling: Coil frost prevention

Heating: High pressure protection Defrost thermistor Heating: Defrosting Fin temperature thermistor Protection Ambient temperature

thermistor

Control/Protection

Heating: Defrosting (Heater) Outdoor heat exchanger

temperature thermistor

Cooling: Control/Protection Capacity code Control

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

Relation between main sensor and actuator

Sensor Purpose

Actuator

Compressor LEV

Outdoor

fan motor

R.V. coil

Defrost

heater

1

Discharge temperature thermistor Protection Indoor coil temperature thermistor

Cooling: Coil frost prevention

Heating: High pressure protection Defrost thermistor Heating: Defrosting Fin temperature thermistor Protection

Ambient temperature thermistor

Control/Protection

Heating: Defrosting (Heater) Outdoor heat exchanger

temperature thermistor

Cooling: Control/Protection Capacity code Control

1 MXZ-2F53VFH only.

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

OBH790

57

SERVICE FUNCTIONS

11

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

<MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF>

11-1. THE POSITION OF SWITCH <MXZ-2F33VF/2F42VF/2F53VF/2F53VFH>

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.

[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.

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

SW1 on the outdoor display P.C. board

<MXZ-2F33VF/2F42VF/2F53VF/2F53VFH> <MXZ-3F53VF/3F68VF/4F72VF>

SW1 on the outdoor control P.C. board

ON

SW1

ON

SW1

Cool/Dry Heat

ON

5

6

SW1

ON

5

6

SW1

Cool/Dry Heat

Outdoor display P.C. board

SW1 SW2

ON

123456

ON

1 2 3 4 5 6

SW1

ON

1 2 3 4 5 6

SW2

CN750

CN751

SW871

Outdoor control P.C. board

OBH790

58

<MXZ-2F33VF/2F42VF/2F53VF/2F53VFH> <MXZ-3F53VF/3F68VF/4F72VF>

SW1 on the outdoor control P.C. board

11-4.

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 the "3" switch of SW1 to ON to enable this function. (MXZ-2F33VF/2F42VF/2F53VF/2F53VFH) Set the "5" switch of the SW1 to ON the enable this function. (MXZ-3F53VF/3F68VF/4F72VF) (3) Turn ON the power supply.

SW1 on the outdoor display P.C. board

ON

SW1

ON

5

6

SW1

11-3. HOW TO SET LOW STANDBY POWER MODE MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

• Before turning on the power supply, settings for dip switch (SW1) and jumper connector (SC751) are necessary on the outdoor controller board.

• When connecting the ducted type indoor unit, deactivate low standby power mode.

To activate low standby power mode:

Connect SC751 to CN750. Set the 2 of SW1 to ON.

To deactivate low standby power mode:

Connect SC751 to CN751. Set the 2 of SW1 to OFF.

NOTE:

• Units come with low standby power mode activated as factory setting.

• When connecting the ducted type indoor unit, outdoor unit will not work with low standby power mode activated.

• In the event that SC751 is missing, outdoor unit will not work.

SC751 SW1 MODE

CN750

Activated

CN751

Deactivated

OBH790

59

11-5. AUTOMATIC LINE CORRECTING <MXZ-2F33VF/2F42VF/2F53VF/2F53VFH>

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

<MXZ-2F33VF/2F42VF/2F53VF/2F53VFH>

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 the "2" of SW2 on the outdoor display P.C. board is turned OFF.

SW2

Indoor/outdoor connecting wire

Terminal block

Refrigerant pipe

Indoor unit B

Liquid/ Gas pipe

Indoor unit A

Outdoor unit

Terminal block

Indoor unit B

Liquid/ Gas pipe

Indoor unit A

Outdoor unit

Terminal block

Indoor unit B

Liquid/ Gas pipe

Indoor unit A

Outdoor unit

B A

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH SW2 on the outdoor display P.C. board

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 the "3" of 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 the "3" of SW2 on the outdoor display P.C. board. (7) Turn ON the power supply.

Number of blinks

Wiring line

LED1 (Red) LED2 (Yellow)

Once Once Not corrected

3 times 3 times Corrected

SW2

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH SW2 on the outdoor display P.C. board

OBH790

60

<MXZ-3F54VF/3F68VF/4F72VF>

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]

&KHFNWKDWRXWVLGHWHPSHUDWXUHLVDERYHÛ& 7KLVIXQFWLRQGRHVQRWZRUNZKHQWKHRXWVLGHWHPSHUDWXUHLVÛ&RUEHORZ

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.

6. Press the switch to cancel.

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.

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

LED indication after cancel :

LED1 (Red)

Lighted

LED indication during detection:

LED indication after detection:

LED2 (Yellow)

Lighted

LED3 (Green)

Once

LED1 (Red)

Lighted

LED2 (Yellow)

Lighted

LED3 (Green)

Not lighted

LED1 (Red)

Lighted

Once

LED2 (Yellow)

Not lighted

Once

Other indications

LED3 (Green)

Lighted

Once

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

located behind the top panel.

Result

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:

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").

LED1 (Red)

Once

3 times

LED2 (Yellow)

Once

3 times

LED3 (Green)

Lighted Lighted

Not corrected Corrected

Number of blinks

Wiring line

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

OBH790

61

12

TROUBLESHOOTING

3. Troubleshooting procedure

1)

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

make sure, check how many times the OPERATION INDICATOR lamp is ﬂ ashing 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.

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 ﬁ rst with the remote controller, and after conﬁ 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.

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.

Lead wiring

Connector housing

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

OBH790

62

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

2.Blinking pattern when outdoor unit is abnormal:

ON

OFF

No beep

Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

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.

2

Yes (Blinks

)

No (OFF)

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

Operational procedure

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

1

1 Regardless of normal or abnormal condition, 2 short

beeps are emitted as the signal is received.

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.

2

Repair the failure parts.

The outdoor unit is normal.

Release the failure mode recall function. 3

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.

Delete the memorized abnormal condition. 3

Release the failure mode recall function. 3

3 Refer to the service manual of indoor unit.

Release the failure mode recall function. 3

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

3

OBH790

63

3. Table of outdoor unit failure mode recall function MXZ-2F

Upper or

left lamp of

OPERATION

INDICATOR

lamp (Indoor

unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C. board)

Condition Remedy

Indoor/

outdoor

unit failure

mode recall

function

LED 1 LED 2

OFF None (Normal)

Not lighted Not lighted

— ——

2-time ﬂ ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates

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.

• Check the compressor connecting wire.

• Refer to 12-6.

"How to check

inverter/compressor".

• Check the stop valve.

○

3-time ﬂ ash Discharge temperature

thermistor

Lighted Once Thermistor shorts or opens during

compressor running.

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

○

Defrost thermistor Lighted Once

○

Ambient temperature thermistor

Lighted Twice

○

Fin temperature thermistor Lighted 3 times

○

P.C. board temperature thermistor

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

○

Outdoor heat exchanger temperature thermistor

Lighted 9 times • Refer to 12-6. "Check of out-

door thermistors".

○

4-time ﬂ ash Overcurrent Once Not

lighted

The overcurrent ﬂ ows into intelligent power module.

• Check the compressor connecting wire.

• Refer to 12-6.

"How to check

inverter/compressor".

• Check the stop valve.

—

Compressor Twice Not

lighted

The overcurrent ﬂ ows into intelligent power module within 10 seconds after the compressor gets started. ( The compressor gets restarted in 15 seconds.)

• Check the compressor connecting wire.

• Refer to 12-6.

"How to check

inverter/compressor".

—

9 times Not

lighted

Waveform of compressor current is distorted.

—

5-time ﬂ ash Discharge temperature Lighted Lighted Discharge temperature exceeds 116ºC

during operation.

• Check the refrigerant circuit and the refrigerant amount.

• Refer to 12-6.

"Check of LEV".

—

6-time ﬂ ash High pressure Lighted Lighted The outdoor heat exchanger temperature

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

• Check the refrigerant circuit and the refrigerant amount.

• Check the stop valve.

—

7-time ﬂ ash Fin temperature 3 times Not

lighted

The ﬁ n temperature exceeds 90ºC during operation.

•

Check the around outdoor unit.

• Check the outdoor unit air pas-

sage.

—

P.C. board temperature 4 times Not

lighted

The P.C. board temperature exceeds 80ºC during operation.

• Refer to 12-6.

"Check of out-

door fan motor".

—

8-time ﬂ ash Outdoor fan motor Lighted Lighted Failure occurs 3 consecutive times

within 30 seconds after the fan gets started.

• Refer to 12-6.

"Check of out-

door fan motor".

—

9-time ﬂ ash Nonvolatile memory data Lighted 5 times Nonvolatile memory data cannot be read

properly.

• Replace the inverter P.C. board.

○

Power module 7 times Not

lighted

The output of the power module that drove the compressor was shorted or the winding of the compressor was shorted.

• Refer to 12-6. "How to check

inverter/compressor".

○

10-time ﬂ ash Discharge temperature Lighted Lighted The discharge temperature is kept

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

• Check the refrigerant circuit and

the refrigerant amount.

• Refer to 12-6.

"Check of LEV".

—

11-time ﬂ ash Current sensor 8 times Not

lighted

The sensor circuit of current of compressor shorts or opens during compressor operate.

• Replace the inverter P.C. board.

○

Bus-bar voltage 6 times Not

lighted

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

• Check the power supply.

• Replace the inverter P.C. board.

○

14-time ﬂ ash Stop valve Lighted 12 times The current of compressor is power

module is out of order.

• Check the stop valve.

• Check the refrigerant circuit and

the refrigerant amount.

○

17 time ﬂ ash Outdoor refrigerant system

abnormality

Lighted 17 times 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.

•

Check for a gas leak in a connecting

piping etc.

• Check the stop valve.

• Refer to 12-6.

"Check of out-

door refrigerant circuit".

○

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

OBH790

64

MXZ-3F, 4F

The left lamp of

OPERATION IN-

DICATOR lamp

(Indoor unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C.

board)

Condition Remedy

Indoor/ outdoor unit failure mode

recall function

LED1 LED2 OFF None (Normal) Lighted Lighted 2-time ﬂ ash Outdoor power system Lighted Lighted

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 after startup.

• Check the connection of the compressor connecting wire.

• Refer to 12-6.

"How to check inverter/compres-

sor".

• Check the stop valve.

○

3-time ﬂ ash

Discharge temperature thermistor

Lighted Once

A thermistor shorts or opens during compressor running.

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

○

Defrost thermistor

Lighted Once

Ambient temperature thermistor

Lighted Twice

Fin temperature thermistor

Lighted 3 times

P.C. board temperature thermistor

Lighted 4 times • Replace the outdoor control P.C.

board.

Outdoor heat exchanger temperature thermistor

Lighted 9 times • Refer to 12-6.

"Check of outdoor

thermistors".

4-time ﬂ ash Overcurrent Once Not

lighted

21 A current ﬂ ows into power module.

• Reconnect compressor connector.

• Refer to 12-6.

"How to check in-

verter/compressor".

• Check the stop valve.

—

5-time ﬂ ash Discharge temperature Lighted Lighted

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

• Check refrigerant circuit and refrigerant amount.

• Refer to 12-6.

"Check of LEV". —

6-time ﬂ ash High pressure Lighted Lighted

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

• Check refrigerant circuit and refrigerant amount.

• Check the stop valve.

—

7-time ﬂ ash Fin temperature 3 times Not

lighted

The ﬁ n temperature exceeds 88°C during op- eration.

• Check around outdoor unit.

• Check outdoor unit air passage.

• Refer to 12-6.

"Check of outdoor

fan motor".

—

P.C. board temperature 4 times Not

lighted

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

8-time ﬂ ash Outdoor fan motor Lighted Lighted

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

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

—

9-time ﬂ ash Outdoor control system Lighted 5 times

Nonvolatile memory data cannot be read properly.

• Replace the outdoor control P.C. board.

○

10-time ﬂ ash Low discharge temperature

protection

Lighted Lighted

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.

• Check refrigerant circuit and refrigerant amount.

• Refer to 12-6.

"Check of LEV".

—

11-time ﬂ ash Communication error

between P.C. boards

Lighted 6 times

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

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

—

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

○

Current sensor Lighted 7 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 detecting circuit 5 times Not

lighted

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

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

—

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

○

Converter 5 times Not

lighted

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

• Check the voltage of power supply.

• Replace the outdoor power P.C. board.

—

Bus-bar voltage 5 times Not

lighted

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

• Check the voltage of power supply.

• Replace the outdoor control P.C. board.

15-time ﬂ ash LEV and drain pump Lighted Lighted The indoor unit detects an abnormality in

the LEV and drain pump.

• Refer to 12-6.

"Check of LEV".

• Check the drain pump of the indoor unit.

—

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

OBH790

65

Operation start

Check the outdoor unit LED indicator.

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

,QGRRUXQLW

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

&22/RU

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

:KHQFRROLQJ

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

:KHQFRROLQJKHDW

exchanger of non-operating indoor unit frosts.

:KHQKHDWLQJQRQ

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

:KHQKHDWLQJ

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

&KHFNPLVSLSLQJ

shortage of capacity.

:KHQFRROLQJ

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

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

Both LED1 and LED2 are OFF.

Both LED1 and LED2 are lighting.

LED1 or LED2 has blinked.

12-3. INSTRUCTION OF TROUBLESHOOTING

• Check the indoor unit with 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.

OBH790

66

12-4. TROUBLESHOOTING CHECK TABLE

MXZ-2F

No.

1

2

3

4

5

6

9

10

11

12

13

14

15

16

Symptom

'Outdoor unit stops and restarts 3 minutes later' is repeated.

Primary current protection

Secondary current protection

High pressure protection Defrosting in cooling

3 times

Lighted

Discharge temperature protection

4 times

Lighted

Low discharge temperature protection

Check the refrigerant circuit and the refrigerant amount. Refer to 12-6.

"Check of LEV".

Refer to 12-6.

"Check of outdoor thermistors".

Refer to 12-6.

"Check of LEV".

Check the refrigerant circuit and the refrigerant amount.

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.

Twice Lighted

Once

Lighted

The discharge temperature exceeds 100°C during operation.

The frequency of the compressor is kept 68 Hz (MXZ-2F33VF)/80 Hz (

MXZ-2F42VF,MXZ-2F53VF/VFH

) or more and the discharge temperature is kept under 50°C (COOL mode)/40°C (HEAT mode) for more than 40 minutes.

The input current exceeds 8 A (MXZ-2F33VF)/ 10 A(

MXZ-2F42VF,MXZ-2F53VF/VFH

).

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.

Outdoor unit operates.

17

18

19

20

7

LED1(Red) LED2(Yellow)

Lighted Twice

Outdoor power system

Lighted 3 times

Discharge temperature thermistor

Outdoor heat exchanger temperature thermistor

Defrost thermistor

Lighted 7 times

Nonvolatile memory data

Replace the inverter P.C. board.

Abnormal point / Condition Remedy

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.

 Replace the inverter P.C. board.

Indication

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.

Condition

The nonvolatile memory data cannot be read properly.

Fin temperature thermistor

P.C board temperature thermistor

Lighted 4 times

Ambient temperature thermistor

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

5 timesLighted

Overcurrent

3 times Not lighted

Discharge temperature protection

Fin temperature protection P.C. board temperature protection

High pressure protection

Replace the inverter P.C. board.

Bus-bar voltage protection

Not lighted

Outdoor fan motor

8 times Not lighted

Current sensor protection

Replace the inverter P.C. board.

Not lighted

Compressor

Refer to 12-6.

"Check of outdoor fan motor".

Reconnect compressor connector. Refer to 12-6.

"How to check inverter/compressor".

Check the stop valve.

Check the amount of gas and the refrigerant circuit. Check the stop valve.

Check the amount of gas and the refrigerant circuit. Refer to 12-6.

"Check of LEV".

&KHFNWKHUHIULJHUDQWFLUFXLWDQGWKHUHIULJHUDQWDPRXQW 5HIHUWR

"Check of outdoor fan motor".

Reconnect compressor connector. Refer to 12-6.

"How to check inverter/compressor".

Check the stop valve.

Twice Not lighted

4 times Not lighted

5 times Not lighted

9 times Not lighted

14 A (MXZ-2F33VF)/18 A (MXZ-2F42VF,MXZ-2F53VF/VFH) current flows into intelligent power module.

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

Discharge temperature exceeds 116°C during operation. Compressor

can 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.

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

Outdoor unit does not operate.

Lighted Once

LEV and drain pump

 Check the connection of the compressor connecting wire.  Refer to 12-6.

"How to check inverter/compressor".

 Check the stop valve.

 Refer to 12-6.

"Check of outdoor thermistors".

 Refer to 12-6.

"Check of outdoor thermistors".

 Refer to 12-6.

"Check of outdoor thermistors".

Refer to 12-6.

"Check of LEV".

 Check the drain pump of the indoor unit.

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

Lighted 11 times

Stop valve Closed valve

Closed valve is detected by compressor current.

(MXZ-2F33VF)

Check the stop valve.

8

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.

&KHFNIRUDJDVOHDNLQDFRQQHFWLQJSLSLQJHWF &KHFNWKHVWRSYDOYH 5HIHUWR

"Check of outdoor refrigerant circuit".

Lighted 17 times

Outdoor refrigerant system abnormality

13 times

10 times

OBH790

67

-

9 times

Lighted

Inverter check mode

Lighted

Normal

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

-

5 times

Lighted

Cooling high pressure protection

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.

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

21

LED1(Red) LED2(Yellow)

Abnormal point / Condition Remedy

Indication

Condition

No.

Symptom

Outdoor unit operates normally.

23

24

Outdoor unit operates.

Outdoor display P.C. board (Parts side)

Lighted

8 times

Lighted

Converter protection

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

22

Check the voltage of power supply. Replace the inverter P.C. board.

LED1

LED2

ON OFF

2.5-second OFF 2.5-second OFF

0.5-second ON

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 flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) The flashing frequency is “2”.

OBH790

68

MXZ-3F, 4F

No. Symptom

Indication

Abnormal point / Con-

dition

Condition Remedy

LED1(Red) LED2(Yellow)

1 Outdoor

unit does not operate.

Lighted Once LEV and drain pump

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

• Refer to 12-6.

"Check of LEV".

• Check the drain pump of the indoor unit.

2

Lighted Twice

Outdoor power system

Overcurrent protection cut-out operates 3 consecutive 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.

• Check the connection of the compressor connecting wire.

• Refer to 12-6.

"How to check inverter/compres-

sor".

• Check the stop valve.

3

Lighted 3 times

Discharge temperature thermistor

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

• Refer to 12-6.

"Check of outdoor thermistors".

4

Lighted 4 times

Fin temperature thermistor

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

• Refer to 12-6.

"Check of outdoor thermistors".

P. C. board temperature thermistor

• Replace the outdoor control P.C. board.

5

Lighted 5 times

Ambient temperature thermistor

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

• Refer to 12-6.

"Check of outdoor thermistors".

Outdoor heat exchanger temperature thermistor

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

Defrost thermistor

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

6

Lighted 6 times

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

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

7

Lighted 7 times Outdoor control system

The nonvolatile memory data cannot be read properly.

• Replace the outdoor control P.C. board.

8

Lighted 8 times Current sensor

Current sensor protection cut-out operates 2 consecutive times.

• Replace the outdoor power P.C. board.

9

Lighted 11 times

Communication error between P.C. boards

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

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

M-NET communication error

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

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

10

Lighted 12 times

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

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

• Replace the outdoor power P.C. board.

11

Lighted 13 times Current sensor

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

• Replace the outdoor power P.C. board.

12

Lighted 14 times Voltage sensor

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

• Replace the outdoor power P.C. board.

13 Lighted 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.

Twice Not lighted

IPM protection

Overcurrent is detected after 30 seconds of compressor startup.

• Reconnect compressor connector.

• Refer to 12-6.

"How to check inverter/

compressor".

• Check the stop valve.

• Check the power module (PAM module).

Lock protection

Overcurrent is detected within 30 seconds of compressor startup.

15

3 times Not lighted

Discharge temperature protection

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

• Check the amount of gas and refrigerant circuit.

• Refer to 12-6.

"Check of LEV".

16

4 times Not lighted

Fin temperature protection

The ﬁ n temperature exceeds during operation.

•Check refrigerant circuit and refrigerant amount.

•Refer to 12-6.

"Check of outdoor fan motor".

P.C. board temperature protection

The P.C. board temperature exceeds during operation.

17

5 times Not lighted

High pressure protection

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

• Check around of gas and the refrigerant circuit.

• Check the stop valve.

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

18

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

• Reconnect compressor connector.

• Refer to 12-6.

"How to check inverter/

compressor".

• Check the power module.

19

8 times Not lighted Converter protection

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

• Replace the outdoor power P.C. board.

20

9 times Not lighted

Bus-bar voltage protection

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

• 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 bus-bar voltage".

21

11 times Not lighted

Low outside temperature protection(cooling)

The ambient became -12°C or less.

—

OBH790

69

No. Symptom

Indication

Abnormal point / Con-

dition

Condition Remedy

LED1(Red) LED2(Yellow)

22 'Outdoor unit

stops and restarts 3 minutes later' is repeated.

13 times Not lighted Outdoor fan motor

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

• Refer to 12-6.

"Check of outdoor fan motor".

23

Lighted 8 times

Current sensor protection

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

• Replace the outdoor power P.C. board.

24

Lighted 11 times

Communication between P.C. boards protection

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

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

25

Lighted 12 times

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

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

• Replace the outdoor power P.C. board.

26 Outdoor unit

operates.

Once Lighted

Primary current protection

The input current exceeds 13.6 A.

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

• Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

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

27

Twice Lighted

High pressure protection

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

Defrosting in cooling

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

28

3 times Lighted

Discharge 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.

• Check refrigerant circuit and refrigerant amount.

• Refer to 12-6.

"Check of LEV".

• Refer to 12-6.

"Check of outdoor thermistors".

29

4 times Lighted

Low discharge temperature protection

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.

• Refer to 12-6.

"Check of LEV".

• Check refrigerant circuit and refrigerant amount.

30

5 times Lighted

Cooling high pressure protection

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

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

• Check if indoor ﬁ lters are clogged.

• Check if refrigerant is short.

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

31

7 times Lighted

High Low Pressure bypass valve Cooling evaporating temperature drop prevention control

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.

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

• Check the indoor ﬁ lters are not clogged.

• Check there is sufﬁ cient refrigerant.

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

32

11 times Lighted

M-NET communication error

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

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

33

Outdoor unit operates normally.

8 times Lighted

Cooling evaporating temperature protection

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.

This symptom does not mean any abnormality of the product.

34

9 times Lighted Inverter check mode

The unit is operated with emergency operation switch.

—

35 Lighted Lighted 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 flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is “2”.

ON OFF

2.5-second OFF 2.5-second OFF

0.5-second ON 0.5-second ON

LED1

LED2

Lighted

Outdoor control P.C. board (Parts side)

OBH790

70

12-5. TROUBLE CRITERION OF MAIN PARTS

Part name Check method and criterion

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

temperature thermistor (RT68)

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.

Discharge temperature thermistor (RT62)

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.

Compressor

W

U

V

WHT

RED

BLK

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

Normal (Each phase)

MXZ-2F33VF

MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF

MXZ-3F68VF MXZ-4F72VF

1.59 - 2.16 0.86 - 1.06 0.91 - 1.13

Outdoor fan motor

23

W

U

V

1

WHT

RED BLK

MXZ-2F33VF/42VF/53VF MXZ-2F53VFH

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

Normal (Each phase)

MXZ-2F

12

- 16

Outdoor fan motor

MXZ-3F54VF/3F68VF/4F72VF

Refer to 12-6.

.

R.V. coil

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

Normal

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

1.2 k - 1.56 k 1.26 k - 1.62 k

Linear expansion valve

LEV

WHT

RED

YLW

ORN

BLU

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

Color of lead wire Normal

WHT - RED

37.4

- 53.9

RED - ORN

YLW - RED

RED - BLU

High pressure switch (HPS)

MXZ-3F54VF/3F68VF/4F72VF

Pressure Normal

HPS

3.43 ± 0.15 MPa Close

4.14 ± 0.1 MPa Open

Defrost heater

MXZ-2F53VFH

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

Normal

349

- 428

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

OBH790

71

Check of power supply

Outdoor unit does not operate.

MXZ-3F54VF/3F68VF/4F72VF

12-6. TROUBLESHOOTING FLOW

Turn ON the power supply.

No

Yes

No

Yes

Check the main power supply circuit for proper connections.

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

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

Check the power supply cable.

Replace the outdoor power P.C. board.

Turn OFF the power supply and recconnect the reactor.

Is the reactor short-circuited?

Replace the reactor.

Replace the outdoor control P.C. board.

Turn ON the power supply.

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

+

-

Check the main power supply circuit for proper connections.

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

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

Check the power supply and correct them.

Replace the outdoor display P.C. board.

Replace the inverter P.C. board.

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

Replace the reactor.

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

Replace the inverter P.C. board.

Is there voltage of 5 V DC between CN936 and CN936 on the outdoor display 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.

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH

OBH790

72

LED indication for communication status

Communication status is indicated by the LED. Unit status No

Blinking: normal communication Lighted: abnormal communication or not connected

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

NOTE: "Lighted" and "Not lighted" in the table below

does not indicate abnormal.

*1 Turn OFF the power supply before

replacing the indoor electronic control

P.C. board.

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH

Refer to indoor unit service manual.

Outdoor display P.C. board

oNoN

LED 1 LED 2 Unit A Unit B status status

Yes

oN

seY

No

Yes

No (Lighted or not lighted)

*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.

Turn ON the power supply.

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

Check the power supply and correct the problem.

Press the EMERGENCY OPERATION switch once.

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

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

Check the indoor/outdoor connecting wire and correct the problem.

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

Is serial signal error indicated 6 minutes later?

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

Check the indoor/outdoor connecting wire and correct the problem.

Turn OFF the power supply.

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

Replace the indoor electronic control P.C. board. *1 *4

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

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

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

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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).

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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.

1RLVHRQWKHLQGRRURXWGRRU

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

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runs near the

power supply cable of

other equipment.

7KHLQGRRURXWGRRUFRQQHFWLQJZLUH

is detoured and run long.

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 .

Blinking

LED1 LED2

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

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

• When the outdoor unit does not operate, the OPERATION INDICATOR lamp on the indoor unit flashes ON and OFF every 0.5-second.

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH

OBH790

73

Is there rated voltage in the power supply?

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.

(Lighted or not lighted)

No

Yes

No

Yes

No

Yes

No

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

No

Yes

No

Yes

No

Yes

Refer to indoor unit service manual.

Turn OFF the power supply.

Turn ON the power supply.

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

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

Press EMERGENCY OPERATION switch once.

Check the power supply.

A

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

B

Turn ON the power supply.

Check the wiring.

Correct them.

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.

2 Be careful of the residual voltage of smoothing capacitor.

Replace the outdoor control P.C. board. 2

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?

Replace the indoor/outdoor connecting wire.

Is serial signal error indicated 6 minutes later?

Yes

No

· Turn OFF inverter-controlled lighting equipment.

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

· Press EMERGENCY OPERATION switch.

B

· Reinstall either the unit or the light away from each other.

· Attach a filter on remote control receiving section of the indoor unit.

A

Is serial signal error indicated 6 minutes later?

No

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

LED indication for communication status

Communication status is indicated by the LED.

Blinking: normal communication Lighting: abnormal communication or not connected

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

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

Unit status

Outdoor control P.C. board

Blinking

LED1 LED2

LED3

LED 1 LED 3LED 2

Pattern

1 2 3

Unit B status

Unit C status

Unit A

status

Unit D

status Unit E status

Not lighted

Lighted

Blinking

MXZ-3F54VF/3F68VF/4F72VF

OBH790

74

Check of R.V. coil

The cooling operation or heating operation does not operate.

No

Yes

No

Yes

No

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?

Turn OFF the power supply. Disconnect the connector CN721.

Replace the inverter P.C. board.

Replace the 4-way valve.

Replace the R.V. coil.

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

1. Disconnect the lead wire leading to the compressor.

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

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

Replace the inverter P.C. board.

Replace the 4-way valve.

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7KHFRROLQJRSHUDWLRQGRHVQRWRSHUDWH

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH

Connector MXZ-2F

CN721 Inverter P.C. board

OBH790

75

No

Yes

No

Yes

No

Yes

No

Yes

1. Disconnect the lead wire leading to the compressor.

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

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

Turn OFF the power supply. Disconnect the connector CNAC2.

Replace the 4-way valve.

Replace the outdoor control P.C. board.

Replace the R.V. coil.

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

Replace the outdoor power P.C. board.

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

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?

Replace the 4-way valve.

Replace the outdoor control P.C. board.

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:KHQKHDWLQJRSHUDWLRQGRHVQRWZRUN

MXZ-3F54VF/3F68VF/4F72VF

Connector MXZ-3F, 4F

CNAC CN712

Outdoor control P.C. board

CNAC2

Outdoor power P.C. board

OBH790

76

Check of LEV

No

Yes

No

Yes

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-2F) CN791: LEV A, CN792: LEV B, CN793: LEV C (MXZ-3F/4F), CN794: LEV D (MXZ-4F), CN797: LEV R (MXZ-3F/4F) Is there normal resistance to LEV coil? (Refer to 12-5.)

Normal

Replace the outdoor control P.C. board.

Replace LEV coil.

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

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

Connector MXZ-2F MXZ-3F/4F

CN724 CN725

Inverter P.C. board

Outdoor control P.C. board

CN791 CN792 CN793 CN794 CN795 CN796

―

OBH790

77

How to check inverter/compressor

• When heating, room does not get warm.

• When cooling, room does not get cool.

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

3 minutes after the power supply is turned ON,

start EMERGENCY OPERATION.

Is output balanced?

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

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.)

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

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

Replace the compressor.

Replace the outdoor power P.C. board.

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or more before measuring the voltage.

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number of indoor units to be operated.

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:

50V-250V Is proper output voltage detected? 1, 2

No

Yes

No

Yes

No

OBH790

78

Check of outdoor thermistors

• When thermistor is abnormal.

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

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.)

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

Normal

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

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.

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

Symbol

RT61 RT62 RT64 RT65 RT68

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

Inverter P.C. board

Board

MXZ-2F33VF/2F42VF/2F53VF MXZ-2F53VFH

MXZ-3F54VF/3F68VF/4F72VF

Normal

Yes

No

Abnormal

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

Symbol

RT61 RT62 RT68 RT65 RT64

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

Outdoor control P.C. board

Outdoor power P.C. board

Board

OBH790

79

Check of outdoor fan motor

• 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.

No

Yes

No

Yes

No

Connector MXZ-2F

CN931 CN932

Inverter P.C. board

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH

OBH790

80

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

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

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

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.

Does the outdoor fan motor rotate smoothly?

Replace the outdoor fan motor.

Resistance

N

N

Measuring points

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

pin1 - pin4

pin5 - pin4

pin6 - pin4

pin7 - pin4

Voltage

15 V DC

325 V DC

1 - 5 V DC

CNF1

pin1 - pin4

pin5 - pin4

pin6 - pin4

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

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

Replace the outdoor fan motor.

Does the fan motor operate for about 5 seconds?

Replace the outdoor fan motor.

Start operation.

Replace the outdoor control P.C. board.

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

MXZ-3F54VF/3F68VF/4F72VF

Connector MXZ-3F, 4F

CNF1

Outdoor control

P.C. board

OBH790

81

The other cases

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

Check of bus-bar voltage

•Check the voltage of power supply.

•Conﬁ rm outdoor unit failure mode recall function. (Refer to 12-2.2.)

Blink 5 times

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

Replace the outdoor power P.C. board.

Blink 9 times

Replace the outdoor control P.C. board.

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

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

Turn ON power supply. Start operation.

Lighting

Replace the outdoor control P.C. board.

Blink 9 times

Replace the outdoor power P.C. board.

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

Turn ON power supply. Start operation.

Normal

Lighting Lighting

Check of HPS

Infinity



No

Yes

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.

Check the resistance between each terminal.

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?

Replace HPS.

Replace the outdoor control P.C. board.

Normal

Connector MXZ-3F, 4F

CN63H

Outdoor control P.C. board

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 ﬁ 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 ﬂ ows into the indoor unit even while it is not operating.

MXZ-3F54VF/3F68VF/4F72VF

OBH790

82

Check of outdoor refrigerant circuit

Has the operation stopped during pump down?

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

No

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.

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

Yes

No

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

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

MXZ-2F33VF/2F42VF/2F53VF/2F53VFH

OBH790

83

12-7. TEST POINT DIAGRAM AND VOLTAGE

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

1. Inverter P.C. board

Back side of unit

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

Fin temperature thermistor/RT64 (CN642)

Ambient temperature thermistor /RT65 (CN643)

Discharge temperature thermistor/RT62 (CN641)

Defrost thermistor/RT61 (CN641)

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

Front side of unit

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

Output to drive compressor (LDU, LDV, LDW)

FUSE (F801) T3.15AL250V

FUSE (F901) T3.15AL250V

Signal of outdoor fan motor (CN931)

Outdoor heat exchanger temperature thermistor /RT68 (CN644)

Smoothing capacitor (C61, C62, C63)

R.V. coil (CN721)

Heater (CN722)

MXZ-2F53VFH

FUSE (F701) T3.15AL250V

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

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

220-230-240 V AC (CN601 , )

Serial signal A (CN601 , ) Serial signal B (CN601

,

CN602 )

Output to drive outdoor fan motor (CN932)

LEV A coil (CN724)

LEV B coil (CN725)

-20 -10 0 10 20 30 40

0

10

20

30

40

50

60

70

80

90

100

Temperature (°C)

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

0 10 20 30 40 50 60 70 80

0

20

40

60

80

100

120

140

160

180

200

Fin temperature thermistor(RT64)

Resistance(k )

Temperature (°C)Temperature (°C)

Discharge temperature thermistor (RT62)

5HVLVWDQFHN

0

100

200

300

400

500

600

700

800

0 10 20 30 40 50 60 70 80 90 100110 120

OBH790

84

CNF1 To fan motor

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

&1)í

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

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

&1)í

Discharge temperature thermistor (RT62)

Outdoor heat exchanger temperature thermistor (RT68)

CNTH1

CNTH2 Ambient temperature thermistor (RT65)

SW1

LED3

LED2

LED1

SW2

SW871

CNAC to outdoor power P.C. board

220 - 230 - 240 V AC

Input

F711 FUSE T3.15AL250V

CN741 Signal translation (

To Communication

adaptor board

)

(-)

CN701 Signal

transmission

(To power board)

5 V DC pulse wave

CN702 Signal

transmission

(To power board)

5 V DC pulse wave

(+)

(-)

15 V

(-)

CN63H High pressure switch

CNDC Bus-bar voltage 290 - 370 V DC

Bus-bar voltage 290 - 370 V DC

15 V DC

CN601

Room A

Input

Room B

Room C

Room D

LEV: 12 V DC pulse wave

CN713 Valve coil

220 - 230 - 240 V AC

Output

CN611

Serial signal 12 ~ 24 V

CN791 LEV Room A(CN792 LEV Room B

CN794 LEV Room D

CN793 LEV Room C

)

*

V

15 V: MXZ-3F54VF

MXZ-3F68VF

MXZ-4F72VF

*

V

Rotate instruction (Constant voltage)

Rotate signal (Pulse wave)

CN621

CN714 Defrost heater

220 - 230 - 240 V AC

Output

Defrost thermistor (RT61)

CN797 LEV Room R

220 - 230 - 240 V AC

0

100

200

300

400

500

600

700

800

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

Temperature( )

Discharge temperature thermistor (RT62)

Resistance(k )

Thermistor R100 = 13.36 k ± 2% B constant = 4014 ± 2%

Rt = 13.36exp{4014( )}

273+t1373

1

-20 -10 0 10 20 30 40 (ºC)

100

90

80

70

60

50

40

30

20

10

0

5HVLVWDQFHN

Temperature

273+t1298

1

Thermistor R25 = 10 k ± 2% B constant = 3950 ± 2%

Rt = 10exp{3950( )}

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

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

2. Outdoor control P.C. board

OBH790

85

3. Outdoor power P.C. board

200

180

160

140

120

100

80

60

40

20

0

5HVLVWDQFHN

Temperature

&

Fin temperature thermistor (RT64)

Thermistor R50 = 17 k ± 2% B constant = 4150 ± 3%

5W H[S^`

273+t1323

1

0 10 20 30 40 50 60 70 80

Output to drive compressor

Connect to earth

Connect to reactor (Red line)

Connect to reactor (White line)

CNDC Bus-bar voltage 290 - 370 V DC

CNAC1 220-230-240 V AC Output

F2 FUSE T6.3AL250V

F1 FUSE T6.3AL250V

220-230-240 V AC Input

CNAC2 220-230-240 V AC Output

Connect to earth

CN152 Signal Transmission (From Outdoor Control P.C. board) 5 V DC pulse wave

(-) (+)

CN171 Fin temperature thermistor (RT64)

CN151 Signal transmission

(To Outdoor control

P.C. board)

5 V DC pulse wave

(+)

(-)

15 V

MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

4. Outdoor display P.C. board

SW1

GND5V

LED2LED1

To inverter P.C. board (CN936)

)

SW2

OBH790

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.

86

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

has the locking mechanism.

Slide the sleeve. Pull the terminal while pushing the locking lever.

Hold the sleeve, and pull out the terminal slowly.

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.

Connector

Sleeve

Locking lever

Photo 1

Screws of Service panel

Screws of the top panel

13-1. MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH

NOTE: Turn OFF the power supply before disassembly.

Photo 2

Hooks

Photo 3

Direction to remove

DISASSEMBLY INSTRUCTIONS

13

Screws of the back panel

Screws of the cabinet

Screws of the back panel

OBH790

OPERATING PROCEDURE PHOTOS

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 section1).

(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. (

10

) 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 section1).

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

ing wire and remove the back panel (Refer to section1).

(3) Remove the inverter assembly (Refer to section2). (4) Remove the R.V. coil.

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 section1). (2) Disconnect the power supply and indoor/outdoor connect-

ing wire and remove the back panel (Refer to section1). (3) Remove the inverter assembly (Refer to section2). (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).

87

Photo 6

Photo 4

Photo 5

Screws of the heat sink support and the separator

Discharge temperature thermistor (RT62)

Reactor (ACL)

Screws of the terminal block support

Reactor (ACL2)

Compressor connector

Inverter assembly

Hooks of the heat sink support

P.C. board support

Screw of the earth wire

Screw of the inverter P.C. board

R.V. coil

OBH790

OPERATING PROCEDURE PHOTOS

5. Removing the outdoor fan motor

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

(Refer to section1).

(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 section1).

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

ing wire and remove the back panel (Refer to section1). (3) Remove the inverter assembly (Refer to section2). (4) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure gauge

shows 0 kg/cm

2

(0 MPa).

(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.

88

Defrost thermistor (RT61)

Photo 9

Photo 8

Screws of the fan motor

Outdoor heat exchanger temperature thermistor (RT68)

Propeller fan

Brazed parts of 4-way valve

Propeller fan nut

Photo 7

Base heater (MXZ-2F53VFH only)

Photo 10

Suction pipe brazed part

Discharge pipe brazed part

Compressor nuts

OBH790

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).

89

13-2. MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF

NOTE: Turn OFF the power supply before disassembly.

Photo 2

Photo 1

Screws of the top panel

Screws of the cabinet

Screws of the top panel

Screws of the cabinet

Screws of the sub panel

Photo 3

Screw of the rear guard

Screws of the back panel

Screws of the cabinet

Screws of the sub panel

Screws of service panel

OBH790

OPERATING PROCEDURE PHOTOS

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.

(

10

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

the heat sink support.

(

11

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

(

12

) Disconnect all connectors and lead wires on the outdoor

power P.C. board.

90

Photo 4

Screws of the electrical box assembly

Electrical box assembly

Catch of the electrical box assembly

Catches of the outdoor control P.C. board

Photo 5

Screws of the outdoor control P.C. board holder

Photo 6

Photo 7

Screws of the reactor

Screws of the outdoor power P.C. board

Heat sink support

Screw of the heat sink support

Screws of the reactor bed

Screw of the reactor bed

OBH790

OPERATING PROCEDURE PHOTOS

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, CN794 (MXZ-4F72VF), 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.

Photo 8

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

2

(0 MPa). (5) Disconnect the outdoor control P.C. board connectors: CN712, CNF1, CNTH1, CNTH2, CN63H, CN791,CN792,

CN793, CN794 (MXZ-4F72VF), 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 and *3 (MXZ-3F54VF).

NOTE: Before removing the sound proof felt, remove

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

(

10

) Remove the screws of the separator, and remove the

separator. (

11

) Detach the brazed parts of the compressor suction and

discharge pipes. (

12

) Remove the compressor nuts and remove the compres-

sor. (

13

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

Sound proof felt *2

R.V. coil

4-way valve

LEV coil R

Expansion valve R

Suction pipe brazed part

Discharge pipe brazed part

Compressor nuts

Power receiver

Hook-and-loop fastener

91

Photo 9

Photo 10

Screws of the outdoor fan motor

Propeller fan

Propeller fan nut

Separator

Sound proof felt *1

Sound proof felt *3 (MXZ- 3F54VF)

OBH790

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

Photo 12

4-way valve

R.V. coil

Brazed parts

Expansion valves

LEV coils

92

OBH790

93

OBH790

94

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

Mitsubishi MXZ-2F53VF, MXZ-2F33VF, MXZ-2F42VF-ET1, MXZ-2F42VF-E1, MXZ-2F53VF-E1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual