Mitsubishi MUZ-AP42VG - ET1, MUZ-AP25VG - ET1, MUZ-AP50VG - E1, MUZ-AP50VG - ET1, MUZ-AP25VGH - E1 Service Manual

...

No. OBH789

Indoor unit service manual MSZ-AP•VG(K) Series (OBH788)

PARTS CATALOG (OBB789)

HFC

utilized

R32

SERVICE MANUAL

OUTDOOR UNIT

NOTE:

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

CONTENTS

1. TECHNICAL CHANGES ···································2

2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ····························· 3

3. PART NAMES AND FUNCTIONS ····················· 5

4. SPECIFICATION ················································ 6

5. NOISE CRITERIA CURVES ······························ 7

6. OUTLINES AND DIMENSIONS ························ 9

7. WIRING DIAGRAM ·········································· 10

8. REFRIGERANT SYSTEM DIAGRAM ············· 13

9. PERFORMANCE CURVES ····························· 15

10. ACTUA TOR CONTROL ··································· 29

11. SERVICE FUNCTIONS ···································· 30

12. TROUBLESHOOTING ····································· 31

13. DISASSEMBLY INSTRUCTIONS ···················· 51

Models MUZ-AP25VG

E1,

ET1

MUZ-AP25VGH

MUZ-AP35VG

E1,

ET1

MUZ-AP35VGH

MUZ-AP42VG

E1,

ET1

MUZ-AP42VGH

MUZ-AP50VG

E1,

ET1

MUZ-AP50VGH

MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG

MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH

MUZ-AP25VG

E1, ET1

MUZ-AP35VG

E1, ET1

MUZ-AP42VG

E1, ET1

MUZ-AP50VG

E1, ET1

MUZ-AP25VGH

MUZ-AP35VGH

MUZ-AP42VGH

MUZ-AP50VGH

1. New model

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.

TECHNICAL CHANGES

OBH789

SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32

Servicing precautions for units using refrigerant R32

WARNING

This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.

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

Do not pierce or burn. Be aware that refrigerants may not contain an odor. Pipe-work shall be protected from physical damage. The installation of pipe-work shall be kept to a minimum. Compliance with national gas regulations shall be observed. Keep any required ventilation openings clear of obstruction. Servicing shall be performed only as recommended by the manufacturer. The appliance shall be stored so as to prevent mechanical damage from occurring.

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 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.

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.

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.

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.

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.

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 installa tion, 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.

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.

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.

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

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

• Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance which may corrode refrigerant containing

components, unless the components are constructed of materials which are inherently resistant to being corroded or are suitably protected against being cor roded.

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 compro mise 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 nec essary 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 During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to any removal of sealed covers,

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

Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of

protection is affected. This shall include damage to cables, excessive number of connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc. Ensure that the apparatus is mounted securely. Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall be in accordance with the manufacturer's specifications.

3. Repair to intrinsically Safe Components

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.

OBH789

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 sys tem 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 sys tems. 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 abso- lutely 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 leak-tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the site.

9. Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re use of reclaimed refrigerant. It is essential that electrical power is available before the task is commenced. a) Become familiar with the equipment and its operation. 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 equipment 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. Labeling Equipment shall be labeled 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 cyl inders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labeled 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 recov ery 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 refriger ant 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 certa

in that flammable refriger ant 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.

OBH789

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH

PART NAMES AND FUNCTIONS

ACCESSORIES

MODELS

MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG

Drain socket 1

MUZ-AP50VG MUZ-AP50VGH

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

OBH789

1 Measured under rated operating frequency.

Outdoor model

MUZ-AP25VG

MUZ-AP25VGH

MUZ-AP35VG

MUZ-AP35VGH

MUZ-AP42VG

MUZ-AP42VGH

MUZ-AP50VG

MUZ-AP50VGH

Power supply Single phase, 230 V, 50 Hz

Capacity Rated frequency (Min.-Max.)

Cooling

2.5 (0.9 - 3.4) 3.5 (1.1 - 3.8) 4.2 (0.9 - 4.5) 5.0 (1.4 - 5.4)

Heating 3.2 (1.0 - 4.1) 4.0 (1.3 - 4.6) 5.4 (1.3 - 6.0) 5.8 (1.4 - 7.3)

Breaker Capacity A 10 16

Electrical data

Power input 1 (Set)

Cooling

600 990 1,300 1,550

Heating 780 1,030 1,490 1,600

Running current

(Set)

Cooling

2.9 4.5 5.8 6.9

Heating 3.6 4.7 6.6 7.0

Power factor

1 (Set)

Cooling

89 95 97 97

Heating 94 95 98 99

Starting current

1 (Set) A 3.6 4.7 6.6 7.0

Coefﬁ cient of performance (COP) 1 (Set)

Cooling 4.17 3.54 3.23 3.23 Heating 4.10 3.88 3.62 3.63

Compressor

Model KVB073FYXMC KVB073FYXMC SVB130FBBMC SVB130FBBMT Output W 470 470 900 900

Current

Cooling

2.50 4.10 5.42 6.39

Heating 3.14 4.20 6.05 6.41

Refrigeration oil (Model) L 0.27 (FW68S) 0.35 (FW68S)

Fan motor

Model RC0J50-NC RC0J50-RA Current

Cooling

0.22 0.22 0.20 0.27

Heating 0.20 0.24 0.23 0.27 Dimensions W × H × D mm 800 × 550 × 285 800 × 714 × 285 Weight kg 31 31 35 40

Special remarks

Dehumidiﬁ cation Cooling L/h 0.3 0.6 1.4 1.9

Air ﬂ ow

Cooling

High

m3/h

2,178 2,178 2,058 2,430

Low 1,038 1,038 906 1,320

Heating

High 2,076 2,076 1,962 2,430 Med. 1,788 1,788 1,686 2,238

Low 1,452 1,452 1,260 1,704

Sound level

Cooling

dB(A)

47 49 50 52

Heating 48 50 51 52

Fan speed

Cooling

High

rpm

940 940 940 840

Low 470 470 460 490

Heating

High 900 900 900 840 Med. 780 780 780 780

Low 640 640 600 610 Fan speed regulator 3 Refrigerant ﬁ lling capacity (R32) kg 0.55 0.55 0.70 1.00

NOTE: Test conditions are based on ISO 5151. Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature 15°C Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C Refrigerant piping length (one way): 5 m

SPECIFICATION

OBH789

Speciﬁ cations and rated conditions of main electric parts

Model

Item

MUZ-

AP25VG

MUZ-

AP25VGH

MUZ-

AP35VG

MUZ-

AP35VGH

MUZ-

AP42VG

MUZ-

AP42VGH

MUZ-

AP50VG

MUZ-

AP50VGH

Smoothing capacitor

(C61) — 600 μF/ 620 μF 420 V

(C62, C63) 600 μF/ 620 μF 420 V Diode module (DB61) 15 A 600 V 25 A 600 V Diode module (DB65) 25 A 600 V

Fuse

(F61) 25A 250V (F62) 15A 250V

(F701, F801, F901)

T3.15AL250V

Defrost heater (H) —

230 V

60W

—

230 V

60W

—

230 V

60W

—

230 V 130W

Power module

(IC700) 15 A 600 V 20 A 600 V (IC932) 5 A 600 V

Expansion valve coil

(LEV) 12 V DC

Reactor (L61) 18 mH 23 mH Switch power

transistor

(Q821) 30 A 600 V

Current-limiting PTC thermistor

(PTC64, PTC65)

33 Ω

Terminal block (TB1) 5 P

Relay

(X63) 3 A 250 V (X64) 20 A 250 V (X66) — 3 A 250 V — 3 A 250 V — 3 A 250 V — 3 A 250 V

(X69) 10 A 230 V R.V.coil (21S4) 220 - 240 V AC Heater protector (26H) —

Open 45°C

—

Open 45°C

—

Open 45°C

—

Open 45°C

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

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

47 48

NC-10

MUZ-AP25VG MUZ-AP25VGH

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

COOLING

FUNCTION

SPL(dB(A))

LINE

HEATING

49 50

NC-10

MUZ-AP35VG MUZ-AP35VGH

NOISE CRITERIA CURVES

OBH789

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

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

NC-10

MUZ-AP42VG MUZ-AP42VGH

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

COOLING

FUNCTION

SPL(dB(A)) LINE

HEATING

NC-10

MUZ-AP50VG MUZ-AP50VGH

Test conditions Cooling: Dry-bulb temperature 35°C Wet-bulb temperature 24°C Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C

OUTDOOR UNIT

MICROPHONE

1 m

OBH789

Unit: mm

MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH

(MUZ-AP25/35/42VG) (MUZ-AP25/35/42VGH)

MUZ-AP50VG MUZ-AP50VGH

OUTLINES AND DIMENSIONS

(MUZ-AP50VG) (MUZ-AP50VGH)

OBH789

WIRING DIAGRAM

MUZ-AP25VG -E1,

ET1

MUZ-AP35VG -E1,

ET1

MUZ-AP25VGH -

MUZ-AP35VGH -

OBH789

MUZ-AP42VG -E1,

ET1

MUZ-AP42VGH -

OBH789

MUZ-AP50VG -E1,

ET1

MUZ-AP50VGH -

OBH789

Unit: mm

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve (with strainar)

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe ø9.52 (with heat insulator)

Refrigerant pipe ø6.35 (with heat insulator)

R.V. coil heating ON cooling OFF

Strainer #100

LEV

Ambient temperature thermistor RT65

Muffler

Capillary tube ø4.0×ø2.4×240

Outdoor heat exchanger temperature thermistor RT68

Stop valve (with service port)

Muffler

REFRIGERANT SYSTEM DIAGRAM

Unit: mm

MUZ-AP42VG MUZ-AP42VGH

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve (with strainar)

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe ø9.52 (with heat insulator)

Refrigerant pipe ø6.35 (with heat insulator)

R.V. coil heating ON cooling OFF

Strainer #100

LEV

Ambient temperature thermistor RT65

Muffler

Capillary tube ø4.0×ø2.4×240

Outdoor heat exchanger temperature thermistor RT68

Stop valve (with service port)

Muffler

MUZ-AP25VG MUZ-AP35VG MUZ-AP25VGH MUZ-AP35VGH

OBH789

MUZ-AP50VG MUZ-AP50VGH

Unit: mm

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve (With strainer)

Stop valve (with service port)

Capillary tube ø

4.0×ø

2.4×240

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe

9.52

(with heat insulator)

Refrigerant pipe ø6.35 (with heat insulator)

LEV

R.V. coil heating ON cooling OFF

Muffler

Outdoor heat exchanger temperature thermistor RT68

Ambient temperature thermistor RT65

Strainer

#100

Muffler

Capillary tube ø3.0×ø2.0×210(×2)

Max. Length A

Max. Height

difference

Indoor unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Model

Refrigerant piping: m Piping size O.D: mm

Max. Length A Max. Height difference B Gas Liquid

MUZ-AP25/35/42/50VG(H) 20 12 9.52 6.35

ADDITIONAL REFRIGERANT CHARGE (R32: g)

Model

Outdoor unit

precharged

Refrigerant piping length (one way)

7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 20 m

MUZ-AP25VG(H)

550

0 20 40 60 80 100 120 140 160 260

MUZ-AP35VG(H) MUZ-AP42VG(H) 700 MUZ-AP50VG(H) 1,000

Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7) NOTE: Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.

OBH789

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 provided 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: °C [WB]

}

Cooling

(2) Indoor outlet air wet-bulb temperature: °C [WB] (3) Outdoor intake air dry-bulb temperature: °C [DB] (4) Total input: W (5) Indoor intake air dry-bulb temperature: °C [DB]

}

Heating(6) Outdoor intake air wet-bulb temperature: °C [WB]

(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.

MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH

INDOOR UNIT

OUTDOOR UNIT

Wet and dry bulb thermometers FRONT VIEW

Wet and dry bulb thermometers BACK VIEW

Cooling capacity (

at Rated frequency)

0.9

1.0

1.1

1.2

1.3

1.4

1.5

-10-5 0 5 1015202530354045 Outdoor intake air Dry-bulb temperature(°C)

Capacity correction factors

20 18

Indoor intake air Wet-bulb temperature( )

10.7

9.9

9.0

8.2

7.4

6.7

5.9

MUZ-AP50VG

MUZ-AP42VG

MUZ-AP35VG

MUZ-AP25VG

Indoor air Wet-bulb temperature

difference (°C)

5.9

5.4

5.0

4.6

4.2

3.8

3.4

8.6

7.9

7.3

6.7

6.0

5.4

4.8

11.7

10.8

9.9

9.0

8.1

7.2

6.4

MUZ-AP25VGH

MUZ-AP50VGH

MUZ-AP42VGH

MUZ-AP35VGH

9-1. CAPACITY AND INPUT CURVES

PERFORMANCE CURVES

OBH789

NOTE: The above broken lines are for the heating operation without any frost and defrost operation.

0.8

0.9

1.0

1.1

1.2

1.3

-10-5 0 5 1015202530354045 Outdoor intake air Dry-bulb temperature (°C)

Input correction factors

22 20 18

Indoor intake air Wet-bulb temperature( )

Indoor air Wet-bulb temperature

difference (°C)

5.0

4.6

4.2

3.8

3.4

3.0

7.3

6.7

6.0

5.4

4.8

4.2

9.0

8.2

7.4

6.7

5.9

5.2

9.9

9.0

8.1

7.2

6.4

5.6

MUZ-AP50VG

MUZ-AP42VG

MUZ-AP35VG

MUZ-AP25VG

MUZ-AP25VGH

MUZ-AP50VGH

MUZ-AP42VGH

MUZ-AP35VGH

Total input (Cooling :

at Rated frequency

)

Indoor air Dry-bulb temperature

difference (°C)

16.2

15.0

13.7

12.5

11.2

10.0

8.7

7.5

6.2

5.0

25.2

23.3

21.3

19.4

17.5

15.5

13.6

11.6

9.7

7.8

27.1

25.0

22.9

20.8

18.8

16.7

14.6

12.5

10.4

8.3

20.3

18.7

17.2

15.6

14.0

12.5

10.9

9.4

7.8

6.2

MUZ-AP50VG

MUZ-AP42VG

MUZ-AP35VG

MUZ-AP25VG

MUZ-AP25VGH

MUZ-AP50VGH

MUZ-AP42VGH

MUZ-AP35VGH

Outdoor intake air Wet-bulb temperature (°C)

-20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Heating capacity (

at Rated frequency)

Capacity correction factor

Indoor intake air Dry-bulb temperature ( )

Indoor air Dry-bulb temperature

difference (°C)

16.2

15.0

13.7

12.5

11.2

10.0

8.7

7.5

6.2

5.0

20.3

18.7

17.2

15.6

14.0

12.5

10.9

9.4

7.8

6.2

25.2

23.3

21.3

19.4

17.5

15.5

13.6

11.6

9.7

7.8

27.1

25.0

22.9

20.8

18.8

16.7

14.6

12.5

10.4

8.3

MUZ-AP50VG

MUZ-AP42VG

MUZ-AP35VG

MUZ-AP25VG

MUZ-AP25VGH

MUZ-AP50VGH

MUZ-AP42VGH

MUZ-AP35VGH

Outdoor intake air Wet-bulb temperature (°C)

-20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Total input (Heating :

at Rated frequency

)

Input correction factor

Indoor intake air Dry-bulb temperature ( )

Lower limit of guaranteed operating range in heating MUZ-AP25/35/42/50VG: -15°C MUZ-AP25/35/42/50VGH: -20°C

OBH789

9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR

0 50 100

150

0.5

1.0

1.5

0 50 100

150

0.5

1.0

1.5

0 50 100

0.5

1.0

1.5

0 50 100

0.5

1.0

1.5

2.0

0 50 100

150

0.5

1.0

1.5

050100

150

0.5

1.0

1.5

0 50 100

150

0.5

1.0

1.5

0 50 100

150

0.5

1.0

1.5

2.0

0 50 100

0.5

1.0

1.5

0 50 100

0.5

1.0

1.5

2.0

0 50 100

0.5

1.0

1.5

0 50 100

0.5

1.0

1.5

2.0

0 50 100

150

0.5

1.0

1.5

050100

150

0.5

1.0

1.5

2.0

0 50 100

150

0.5

1.0

1.5

050100

150

0.5

1.0

1.5

2.0

MUZ-AP25VG MUZ-AP25VGH

MUZ-AP35VG MUZ-AP35VGH

Correction of Cooling capacity

Capacity correction factors

Correction of Cooling input

Input correction factors

Correction of Heating capacity

Capacity correction factors

MUZ-AP42VG MUZ-AP42VGH

Correction of Heating input

Capacity correction factors

Correction of Cooling capacity

Capacity correction factors

Correction of Cooling input

Input correction factors

Correction of Heating capacity

Capacity correction factors

MUZ-AP50VG MUZ-AP50VGH

Correction of Heating input

Capacity correction factors

The operatio na l freq uency of compressor (Hz)

The op erat i o na l frequency of compressor (Hz)

The operational frequency of compressor (Hz)

Correction of Cooling ca pa ci ty

The operatio na l freq uency of compressor (Hz)

Ca pacity correct io n f a ct o rs

Correction of Cooling input

The operational frequency of compressor (Hz)

In put correction factors

Correction of Heati ng capacity

The operational frequency of compressor (Hz)

Capacity correction factors

Correction of Heati ng input

The operational frequency of compressor (Hz)

Input correction factors

Co rrect io n o f C o o ling capacity

The op erat i o na l frequency of compressor (Hz)

Ca pacity correct io n f a ct o rs

Cor rection of Cooling input

The op erat i o na l frequency of compressor (Hz)

Inp ut correcti o n f a ct o rs

Correction of Heati ng capacity

The operational frequency of compressor (Hz)

Capacity correction factors

Correction of Heati ng input

The operational frequency of compressor (Hz)

Input correction factors

OBH789

15 20 25 30 35

0.5

0.7

0.9

1.1

1.3

1.5

15 20 25 30 35

0.5

0.6

0.7

0.8

0.9

1.0

15 20 25 30 35

0.5

0.7

0.9

1.1

1.3

1.5

15 20 25 30 35

0.5

0.7

0.9

1.1

1.3

1.5

(kgf/cm2 [Gauge])(MPa [Gauge])

50 60 70

Ambient temperature(°C) Ambient humi di ty ( %)

50 60 70

Ambient temperature(°C) Ambient humi di ty( %)

50 60 70

Ambient temperature(°C) Ambient humi dity(%)

50 60 70

Ambient temperature(°C) Ambient humi di ty( %)

Outdoor low pressure

MUZ-AP25VG MUZ-AP35VG

MUZ-AP42VG

MUZ-AP50VG

MUZ-AP25VGH

MUZ-AP35VGH MUZ-AP42VGH

MUZ-AP50VGH

COOL operation

Both indoor and outdoor unit are under the same temperature/

humidity condition.

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

9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

Dry-bulb temperature (°C) Relative humidity (%)

20 50 25 60 30 70

9-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION

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 in COOL mode or 58 Hz in HEAT mode.

4. Indoor fan operates at High speed.

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

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

NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system) The conversion factor is: 1 (MPa [Gauge]) = 10.2 (kgf/cm

[Gauge])

OBH789

+ 40 hidden pages

Mitsubishi MUZ-AP42VG - ET1, MUZ-AP25VG - ET1, MUZ-AP50VG - E1, MUZ-AP50VG - ET1, MUZ-AP25VGH - E1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual