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Mitsubishi Luftkonditionering MUZ-AP42VG

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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. ACTUATOR CONTROL ··································· 29

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

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

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

Models

MUZ-AP25VG - E1 , ET1 MUZ-AP25VGH - E1

MUZ-AP35VG - E1 , ET1 MUZ-AP35VGH - E1

MUZ-AP42VG - E1 , ET1 MUZ-AP42VGH - E1

MUZ-AP50VG - E1 , ET1 MUZ-AP50VGH - E1

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

- E1

MUZ-AP35VGH

- E1

MUZ-AP42VGH

- E1

MUZ-AP50VGH

- E1

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

2SERVICING 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