Mitsubishi PUD-P250YMF-C, PFD-P500VM-A, PFD-P250VM-A Service Manual

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AIR CONDITIONERS CITY MULTI

Models < Outdoor unit >

PUD-P250YMF-C

< Iutdoor unit >

PFD-P250VM-A PFD-P500VM-A

Service Handbook

Service Handbook PUD-P250YMF-C

PFD-P250VM-A PFD-P500VM-A

Issued in Jun. 2004 MEE03K207-A Printed in Japan

New publication effective Jun.2004 Specifications subject to change without notice.

HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Service Handbook Close Control PUD-P250YMF-C/PFD-P250, P500VM-A

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Contents

Please Read Before Servicing the Unit

1 Check Before Servicing the Unit .................................................. 8

[1]

Find out the model type and refrigerant type of the unit to be serviced

.. 8

[2] Principal System Components .............................................. 8

[3] Check the symptoms of the unit requiring service ................ 9

[4]

Be sure to read Read Before Servicing at the beginning of this manual

.. 9

[5] Prepare necessary tools ........................................................ 9

[6] If the refrigerant circuit is opened (to repair gas leak etc.),

the drier needs to be replaced .............................................. 9

[7]

Preparing the connecting pipes: When relocating or replacing

the unit, find out what types of refrigerant is used for the unit

.... 9

[8]

If there is a gas leak or if the remaining refrigerant is exposed to an open flame,

a noxious gas hydrofluoric acid may form. Provide adequate ventilation

.......... 9

2 Necessary Tools and Materials.................................................... 10

[1]

List of Tools and Materials Necessary for Units that Use R407C

(and adaptability of tools that have been used with units that use R22)

...... 10

3 Piping Materials .......................................................................... 11

4 Storage of Piping Materials.......................................................... 12

[1] Storage Location .................................................................... 12

[2] Pipe sealing before storage.................................................... 12

5 Machining Pipes .......................................................................... 13

6 Brazing ........................................................................................ 14

7 Testing Air Tightness.................................................................... 15

8 Vacuum Drying (Evacuating) ...................................................... 16

9 Charging the Circuit with Refrigerant .......................................... 17

0 What to Do When Refrigerant Leaks .......................................... 19

A Replacing the Drier ...................................................................... 19

. Restrictions

1 System Restrictions and System Configuration .......................... 20

[1] Switch Setting ........................................................................ 20

2 Restrictions on Transmission Lines.............................................. 22

[1] Electrical Wiring ...................................................................... 22

3 Restrictions on Refrigerant Pipe Length ...................................... 38

[1] Refrigerant Piping .................................................................. 38

. Components of the Unit

1 Internal Structure ........................................................................ 39

2 Control Box .................................................................................. 42

3 Main Board .................................................................................. 44

. Electrical Wiring Diagrams

1 Outdoor Unit ................................................................................ 49

2 Indoor Unit.................................................................................... 50

. Refrigerant Circuit

1 Refrigerant Circuit Diagram ........................................................ 52

2 List of Major Component Functions ............................................ 53

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. Control

1 Dip Switch Functions and Factory Settings ................................ 56

[1] Outdoor Unit .......................................................................... 56

[2] Indoor Unit .............................................................................. 57

2 Controlling the Outdoor Unit ........................................................ 58

[1] Initial Control .......................................................................... 58

[2] Control at startup .................................................................... 58

[3] Bypass control ........................................................................ 58

[4] Frequency Control .................................................................. 59

[5] Oil-Return Control .................................................................. 60

[6] Outdoor Unit Fan .................................................................... 60

[7] Subcool Coil Control (Linear Expansion Valve (LEV1)).......... 60

[8] Circulating composition sensor (CS circuit)............................ 60

[9] Emergency Operation Mode .................................................. 61

[10]

Capacity Control Between Outdoor Units (For P500 Type Only)

.. 61

[11] Control-Block Diagram.......................................................... 62

[12] Operation Modes .................................................................. 62

3 Controlling the Indoor Unit .......................................................... 63

[1] Thermostat Functions ............................................................ 63

[2] Actuator Control...................................................................... 64

[3] Temperature Setting Range.................................................... 64

[4] Emergency Operation Mode .................................................. 64

[5] Three-minute restart-suspension mode.................................. 65

[6] Anti-Freeze Control ................................................................ 65

[7] Operation during Electrical Power Failure .............................. 65

4 Operation Flow Chart .................................................................. 66

[1] Mode Selection Flow Chart .................................................... 66

[2] Operation in each Mode ........................................................ 68

. Refrigerant Amount Adjustment

1 Operating Characteristics and Refrigerant Amount .................... 69

[1] Operating Characteristics/Refrigerant Amount ...................... 69

2 Checking and Adjusting Refrigerant Amount .............................. 69

[1] Symptoms .............................................................................. 69

[2] Refrigerant Volume ................................................................ 69

[3] Amount of Refrigerant to Be Added ...................................... 70

3 Refrigerant-Adjustment Operation Mode .................................... 71

[1] Procedures (only for air-cooled outdoor units) ...................... 71

. Troubleshooting

1 List of Check Code ...................................................................... 73

2 Intermittent Fault Check Code (outdoor units only) .................... 74

3 Self-Diagnosis and Problem-Solving Using Check Codes .......... 75

[1] Mechanical.............................................................................. 75

[2] Communication / System........................................................ 86

[3] System error .......................................................................... 93

[4] Troubleshooting using information on problems

with Remote Control, Input from External Source ................ 95

4 Transmission Wave Pattern and Noise Check ............................ 99

[1] M-NET Transmission .............................................................. 99

[2] MA Remote Controller Transmission ...................................... 100

5 Troubleshooting............................................................................ 102

[1] Principal Parts ........................................................................ 102

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. LED Monitor Display

1 How to Read the Service Monitor LED........................................ 115

[1] How to read the LED .............................................................. 115

[2] Outdoor Unit Control LED Monitor.......................................... 116

. Test Run

1 Before a Test Run ........................................................................ 124

2 Test-Run Method.......................................................................... 124

3 Not to Be Alarmed When the Following Symptoms Appear........ 125

4 Standard Operation (reference data) .......................................... 126

[1] Cooling Operation .................................................................. 126

[2] Operation under Other Conditions.......................................... 126

. When Refrigerant Leaks

1 Repairing Leaks: Preparation, making repairs, and recharging

the system with refrigerant .......................................................... 127

[1] Location of leaks: Extension piping or indoor unit.................. 127

[2] Location of leaks: Outdoor unit .............................................. 127

0011

. Circulating Composition Analysis

1 Check the Composition of the Refrigerant .................................. 128

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Warning

Safety Precautions

Warning: Failure to follow all instructions may result in serious personal injury or death.

Caution: Failure to follow all instructions may result in personal injury or damage to the unit.

sAfter reading this handbook, hand it over to those who will be using the unit. sThe user of the unit should keep this manual at hand and make it available to those who will be

performing repairs, to those who will be relocating the unit, and to new users.

Have the unit professionally installed.

• Improper installation by an unqualified person may result in water leak, electric shock, or fire.

Only use specified cables for wiring. Securely connect each cable, and make sure that the cables are not straining the terminals.

• Cables not connected securely and properly may generate heat and cause fire.

Do not make any changes or modifications to the unit. In case of problems, consult the dealer.

• Inadequate repairs may result in water leak, electric shock, or file.

Only use Refrigerant R407C.

• The use of any other refrigerant or the introduction of air into the unit circuit may damage the unit.

Have all electrical work performed by a licensed electrician according to the local regulations and the instructions given in this manual. Secure a circuit designated exclusively to the unit.

• Improper installation or a lack of circuit capacity at the power source presents a risk of electric shock or fire.

Be sure to carefully follow each step in this handbook when installing the unit.

• Improper installation may result in water leak, electric shock, or fire.

Securely attach the terminal cover (panel) on the unit.

• If installed improperly, dust and/or water may enter the unit and fire or electric shock may result.

When relocating the air conditioner, consult the dealer or a specialist.

• Improper installation may result in water leak, electric shock, or fire.

After completing service work, check for refrigerant gas leaks.

• If leaked refrigerant gas is exposed to a heart source, such as fan heater, stove, and electric grill, noxious gases may form.

Only use specified parts, and have the unit professionally installed.

• Improper installation may result in water leak, electric shock, or fire.

When installing the unit in a small room, safeguard against hypoxia, which is caused by the leaked refrigerant exceeding the threshold level.

• Consult the dealer for necessary measures to take.

When a gas leak is detected, provide adequate ventilation to the room.

• If leaked refrigerant gas is exposed to a heat source, noxious gases may form.

Do not try to defeat the safety features of the devices, and do not change the settings.

• Defeating the safety features such as the ones on pressure switch and temperature switch or using parts other than those specified by Mitsubishi Electric may result in fire or explosion.

Place the unit on a stable, level surface that will withstand the weight of the unit to prevent the unit from toppling over.

Take necessary safety measures against typhoons and earthquakes to prevent the unit from toppling over.

Do not touch the fins on the heat exchanger with bare hands: they are sharp and dangerous.

sBefore installing the unit, be sure to read all the “Safety Precautions” very carefully. sThey provide very important information regarding safety. Be sure to take these precautions to ensure safety.

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Caution

Precautions for Devices that Use R407C Refrigerant

Do not use existing refrigerant piping.

• The old refrigerant and refrigerator oil in the existing piping contain a large amount of chlorine, which will deteriorate the refrigerator oil in the new unit.

Use refrigerant pipes made of C1220 phosphorus deoxidized copper categorized under H3000 (Copper and Copper Alloy Seamless Pipes and Tubes), a standard set by JIS.

• Keep inner and outer surfaces of the pipes clean and free of contaminants, such as sulfur, oxides, dust/dirt, shaving particles, oils, and moisture. Contaminants inside the refrigerant piping will deteriorate the refrigerant oil.

Store the piping to be used during installation indoors, and keep both ends of the piping sealed until immediately before brazing. (Keep elbows and other joints wrapped in plastic.)

• If dust, dirt, or water enters the refrigerant circuit, deterioration of the oil or compressor problems may result.

Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flange connections.

• Refrigerator oil will deteriorate if it is mixed with a large amount of mineral oil.

Be especially careful when managing tools.

• Exercise caution so that tools do not introduce dust, dirt, and water into the refrigerant cycle.

Use liquid refrigerant to charge the circuit.

• Charging the unit with gas refrigerant will cause the refrigerant in the cylinder to change its composition and will lead to a drop in performance.

Only use R407C refrigerant.

• The use of other refrigerants containing chlorine (i.e. R22) will deteriorate the refrigerant.

Do not use the following tools that have been used with the existing refrigerators.

(Gauge manifold, charge hose, gas-leak detector, reverseflow-check valve, refrigerant charge base, vacuum gauge, and refrigerant recovery equipment.)

• If refrigerant and / or refrigerant oil left on these tools are

mixed in with R407 or if water is mixed with R407C refrigerant, the refrigerant will deteriorate.

• Since R407C does not contain chlorine, gas-leak detectors

for conventional refrigerators will not work.

Do not use a charging cylinder.

• The use of charging cylinder will change the composition of

the refrigerant and lead to power loss.

Use a vacuum pump with a reverse-flow-check valve.

• If other types of valves are used, the vacuum pump oil will

flow back into the refrigerant circuit and deteriorate the refrigerator oil.

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Caution

Before Installing the Unit

Do not use the unit to preserve food, animals, plants, or artifacts, or for other special purposes.

• The unit is not designed to provide adequate conditions to preserve the quality of these items.

Use a closed circulating water circuit (which does not release water in the air) as a heat source.

Do not install the unit in a place where there is a possibility of flammable gas leak.

• Leaked gas accumulated around the unit may start a fire.

Do not use the unit in an unusual environment.

• Installing the unit in a place where a large amount of oil, steam, or sulphurous gas is present may lead to a remarkable drop in performance and/or damage to the unit.

Ground the unit.

• Do not connect the grounding on the unit to the grounding terminals of gas pipes, water pipes, lightning rods, or telephones. Improper grounding presents a risk of electric shock.

Heat-Source Unit is only to be installed indoors (including mechanical rooms). Make sure that the temperature around the heat-source unit does not exceed 40˚CDB and that it is out of direct sunlight.

• A sharp rise in the temperature inside the unit may damage the unit.

When installing draining pipes, follow the instructions in the manual and make sure that they properly drain water as to prevent dew condensation.

• If not installed properly, water may leak and damage the furnishings.

Make sure that the quality of circulating water meets the standards set by Mitsubishi based on the Guidelines for the Quality of Water for Refrigeration and Air Conditioning established by the Japan Refrigeration and Air Conditioning Industry Association.

• Using low-quality water may result in decreased performance of the water-heat exchanger or corrosion.

Do not place the unit on or over things that should not get wet.

• When humidity level exceeds 80% or when the drainage system is clogged, indoor units may drip water. Installation of a centralized drainage system for the heat-source unit may also need to be considered to prevent water drips.

When installing the unit in hospitals, take necessary measures against noise interference.

• High-frequency medical devices may interfere with the normal operation of the air conditioning unit or vice versa.

• Water in an open circulating water circuit may become contaminated when exposed to air and lead to a drop in water-heat exchanger performance. It may also corrode the exchanger.

Use breakers and fuses with proper current capacity. Do not use large-capacity fuses, steel wire, or copper wire, for they may damage the unit or cause fire.

For electrical wiring, use standard wires with proper current capacity to prevent electric leak, overheating, and fire.

Caution

Before Installing (Relocating) the Unit or Performing Electrical Work

Make sure the wires are not subject to tension.

• If the wires are too taut, they may generate heat and cause fire.

Install a leak breaker at the power source to avoid the risk of electric shock.

Do not spray water on air conditioners. Spraying the unit presents a risk of electric shock.

Periodically check the platform on which the unit is placed for damage to prevent the unit from toppling over.

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Caution

Before Installing (Relocating) the Unit or Performing Electrical Work

Turn on the unit at least 12 hours before the test run, and keep the unit on throughout the season.

• If the unit is turned off during the season, problems may occur.

Do not turn off the power immediately after stopping the unit.

• Wait for at least five minutes; otherwise, the unit may leak water or experience other problems.

Do not touch refrigerant piping with bare hands during and immediately after operation.

• Depending on the state of the refrigerant in the system, refrigerator parts such as piping and compressor may become very hot or cold and may subject the person to frost bites or burning.

Do not operate the unit without panels and safety guards in their proper places.

• They are provided to keep the users from injury from accidentally touching rotating, high-temperature, or highvoltage parts.

Properly dispose of packing materials.

• Things such as nails and wood pieces may be included in the package. Dispose of them properly to prevent injury.

• Plastic bags present a choking hazard to children. Tear up the plastic bags before disposing of them to prevent accidents.

Exercise caution when transporting products.

• Do not try to move equipments over 20kg (approx. 44 lbs.) alone.

• Do not use the PP bands used on some packages for transportation.

• Wear protective gloves to avoid injury caused by coming in contact with the fins on the heat exchanger.

• When using suspension bolt to transport heat-source unit, use four-point suspension. Three-point suspension does not provide adequate stability and presents a risk of injury.

Caution

Before the Test Run

To prevent the risk of electric shock, do not operate switches with wet hands.

Do not operate the unit without air filters.

• Dust particles in the air may clog the system.

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Please Read Before Servicing the Unit

Check Before Servicing the Unit

[1] Find out the model type and refrigerant type of the unit to be serviced.

[2] Principal System Components

PUD-P250YMF-C

10HP(downward flow): PFD-P250VM-A(-H) 20HP(downward flow): PFD-P500VM-A(-H)

✻

'-H' in the indoor units indicates that the unit pipes come out of the top of the unit (50/60Hz, fit to order).

✻

PFD-type indoor units cannot be connected to outdoor units other than the ones specified above.

✻

PFD-type indoor units and other types of indoor units cannot coexist in the same refrigerant system.

} Outdoor Unit

} Indoor Unit

<10HP System>

<20HP System>

When using a PFD-P500VM-A as an indoor unit, connect 2 PUD-P250YMF-C outdoor units to each indoor unit and operate with a built-in remote control for the indoor unit.

✻1: Bold line indicates refrigerant piping (gas/liquid). This system consists of 2 refrigerant circuits. ✻2: Indicates TB3-type transmission line that connects the indoor and outdoor units.

This system consists of 2 refrigerant circuits.

✻3: Indicates TB7-type transmission line that allows the unit to communicate with the controller.

When using a PFD-P250VM-A as an indoor unit, connect an outdoor unit PUD-P250YMF-C to each indoor unit and operate with a built-in remote control for the indoor unit.

✻1: Bold line indicates refrigerant piping (gas/liquid). This system consists of one refrigerant circuit. ✻2: Indicates TB3-type transmission line that connects the indoor and outdoor units.

This system consists of 1 refrigerant circuit.

✻3: Indicates TB7-Type transmission line that allows the unit to communicate with the controller.

Outdoor Unit

G-50A

PUD-P250YMF-C

Indoor Unit

PFD-P250VM-A

TB7

TB3 ✻2✻3

✻1

12V DC

M-NET

PAC-SC50KUA

POWER RATING

MODEL

WEIGHT SERIAL No.

2.11kg

POWER SUPPLY UNIT

MITSUBISHI ELECTRIC CORPORATION

PAC-SC50KUA

Outdoor Unit

PUD-P250YMF-C

Indoor Unit

PFD-P500VM-A

TB7

TB3 ✻2

✻1

TB3

PUD-P250YMF-C

TB7

✻3

G-50A

12V DC

M-NET

PAC-SC50KUA

POWER RATING

MODEL

WEIGHT SERIAL No.

2.11kg

POWER SUPPLY UNIT

MITSUBISHI ELECTRIC CORPORATION

PAC-SC50KUA

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[3] Check the symptoms of the unit requiring service.

Refer to this service manual for problems related to Freezer Cycle.

[4] Be sure to read Read Before Servicing at the beginning of this manual.

[5] Prepare necessary tools.

Do not use the same tools for units that use different types of refrigerant (especially gauze manifold and charge hose). Doing so may cause problems. Use a vacuum pump with a reverse-flow check valve or use a reverse flow check adapter.

[6] If the refrigerant circuit is opened (to repair gas leak etc.), the drier needs to be

replaced.

Only use the drier designed specifically for the unit. The use of other driers may result in malfunctions. Refer to section 11 of this manual for information regarding how to change the drier. ✻ Replace the drier after completing refrigerant circuit repairs.

(If left exposed to air, the drier will absorb moisture. Replace the drier as quickly as possible after removing the old one.)

[7] Preparing the connecting pipes: When relocating or replacing the unit, find out what

types of refrigerant is used for the unit.

Use refrigerant pipes made of C1220 phosphorus deoxidized copper categorized under H3000 (Copper and Copper Alloy Seamless Pipes and Tubes), a standard set by JIS. Keep inner and outer surfaces of the pipes clean and free of contaminants, such as sulfur, oxides, dust/dirt, shaving particles, oils, and moisture. Contaminants inside the refrigerant piping will deteriorate the refrigerant oil.

[8] If there is a gas leak or if the remaining refrigerant is exposed to an open flame, a

noxious gas hydrofluoric acid may form. Provide adequate ventilation.

Caution

1. As soon as the old parts are removed, put in the new ones. Keep moisture from entering pipes while cooling.

2. Using refrigerant containing chlorine (such as R22) will result in the deterioration of oil in the new unit.

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NotesUseTools

Identification of dedicated use with R407C: Record refrigerant name and put a brown belt on the upper part of the cylinder.

Use a small amount of ester oil, ether oil, or alkybenzene.

The ones with sight glass are useful.

Can also be used with R134a.

Gauge Manifold

Refrigerant Collector

Gas Leak Detector

Charge Hose

Refrigerant Cylinder

Application Oil

Evacuating, refrigerant charging and operation check

Gas leak detection

Refrigerant collection

Refrigerant charging

Applied to flares and flanges

Attach a reverse-flow-check adaptor

Refrigerant Cylinder Intake Refrigerant charging

Replace the packing with the one for R407C

Modifications to Be MadeUseTools

Vacuum Pump Vacuum drying

Vacuum Pump with a Check valve

Vacuum Gauze

Refrigerant Charging Meter

Welder and Nitrogen Cylinder

Pipe Cutter

Torque Wrench

Bender

Flare Tool Flaring pipes

Checking vacuum degree

Refrigerant charging

Welding pipes

Cutting pipes

Tightening flare nuts

Bending pipes

NotesUseTools

Must not be used with R407C-type units

NotesUse (with R22)Tools

Charging Cylinder Refrigerant Charging

Necessary Tools and Materials

Prepare the following tools and materials. Some of the tools should be marked for use only with units that use R407C refrigerant.

[1] List of Tools and Materials Necessary for Units that Use R407C (and adaptability of

tools that have been used with units that use R22)

(1) To be used with R407C Only (not to be used if used with R22)

(2) Tools that may be used for R407C if necessary modifications are made

(3) Tools that are used with R22 that can also be used with R407C

(4) Tools that must not be used for R407C

Tools for R407C must be handled with special care.

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Do not use the piping that have been used for R22.

A large amount of chlorine residues from conventional refrigerator oil and refrigerant found inside the existing piping deposit sludge in the new piping system.

1. When replacing the air conditioner, also replace the piping.

2. Use refrigerant pipes made of C1220 phosphorus deoxidized copper categorized under H3000 (Copper and Copper Alloy Seamless Pipes and Tubes), a standard set by JIS. Keep inner and outer surfaces of the pipes clean and free of contaminants, such as sulfur, oxides, dust/dirt, shaving particles, oils, and moisture.

3. Contaminants inside the refrigerant piping may deteriorate the refrigerant oil.

Piping Materials

NOOK

New Piping Existing Piping

Do not use the existing piping!

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Storage of Piping Materials

[1] Storage Location

NONO

OKOK

NONO

OKOK

Store the pipes to be used indoors (i.e. warehouse). Storing them outdoors may cause dirt, waste, or water to infiltrate.

[2] Pipe sealing before storage

Both ends of the pipes should be sealed until immediately before brazing. Wrap elbows and T’s in plastic for storage.

✻ The new refrigerator oil is ten times more hygroscopic than conventional refrigerator oils (such as Suniso).

Water infiltration in the refrigerant circuit will deteriorate the oil or cause a compressor failure. Exercise more caution when handling piping materials for R407C air conditioners than you would when handling piping materials for conventional units.

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Machining Pipes

Use a small amount of ester oil, ether oil, or alkylbenzene as refrigerator oil to coat flares and flange connections.

Use only the smallest possible amount of oil necessary.

Do not use oils other than ester oil, ether oil, or alkylbenzene.

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1. Do not conduct piping work outdoors on a rainy day.

2. Apply non-oxide brazing.

3. Use brazing material (BCuP-3), which requires no flux when brazing copper pipe or brazing a copper pipe and copper coupling.

4. If the installed refrigerant pipes are not immediately connected to the unit, braze and seal both ends of the pipes.

1. The new refrigerant oil is ten times more hygroscopic than conventional oils. Special care must be taken to keep moisture out of the system.

2. Flux generally contains chlorine. A residual flux in the refrigerant circuit may deposit sludgy materials in the pipes.

Because the residue found in commercially available antioxidants may have adverse effects on the unit, use nitrogen when performing non-oxide brazing.

Brazing

Although there are no changes from the conventional method, special care must be taken to keep contaminants (i.e. oxide scale, water, dirt etc.) from entering refrigerant circuit.

Example: Inside a brazed section

Brazed with materials other than non-oxide

brazing material

Brazed with non-oxide brazing material

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NO NO

Testing Air Tightness

There are no changes from the conventional method. Note that a refrigerant leak detector for R22 will not work for R407C.

1. Pressurize the equipment with nitrogen up to the design pressure, and then measure the equipment’s air-tightness, taking temperature variations into account.

2. When investigating locations of leaks using a refrigerant, be sure to use R407C.

3. Make sure that R407C is in a liquid state when charging the circuit.

1. Use of oxygen to pressurize the equipment may cause an explosion.

2. If gas refrigerant is used, the composition of the remaining refrigerant in the cylinder will change and become unusable.

A leak detector for R407C is commercially available, and it should be acquired.

Halide Torch R22 Leak Detector

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[1] Vacuum pump with a check valve (See photo 1)

A vacuum pump with a check valve is required to prevent the vacuum pump oil from flowing back into the refrigerant circuit when the power supply is cut off unexpectedly due to power outage. A check valve may be added to a vacuum pump that is not equipped with one.

[2] Standard degree of vacuum for the vacuum pump

Use a pump that does not exceed 65Pa after 5 minutes of operation. Be sure to use a vacuum pump that has been properly maintained and oiled with specified oil. If the vacuum pump is not properly maintained, desired degree of vacuum may not be achieved.

[3] Necessary Accuracy of the Vacuum Gauge

Use a vacuum gauge that can measure 650Pa and in the increments/decrements of 130Pa. Do not use gauge manifolds that cannot measure a vacuum of 650Pa. (Recommended vacuum gauze shown in Photograph 2 above)

[4] Vacuuming time

Evacuate the equipment for one hour after reaching 650Pa. (Moisture in the air will be removed by a thorough evacuation.) After evacuating, leave the equipment for one hour and make sure that degree of vacuum does not rise higher than 130Pa. Refer to section 6 “Special Vacuuming Method” if it exceeds 130Pa.

[5] How to Stop the Vacuum Pump

In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum pump or loosen the charge hose to draw in air before stopping the operation. The same operating procedure should be followed when using a vacuum pump with a check valve.

[6] Special Vacuuming Method

Water infiltration or leakage is suspected when the degree of vacuum does not go below 650Pa after running the vacuum pump for more than 3 hours. Check for leakage and water infiltration. If water infiltration is the suspected cause, break vacuum with nitrogen. Then, pressurize nitrogen gas to

0.05MPa and try evacuating again. Repeat the procedure until the degree of vacuum goes below 650Pa or until the pressure stops rising. Be sure to use nitrogen to break vacuum. (The use of oxygen may cause an explosion)

Photograph 1 Photograph 2

Photograph 1 Recommended Vacuum Gauge : ROBINAIR 14010 Thermistor Vacuum Gauge

Vacuum Drying (Evacuating)

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Charging the Circuit with Refrigerant

R407C must be in a liquid state when charging the circuit because it is a non-azeotropic refrigerant.

1. R407C is a mixture of three refrigerants, each with a different evaporation temperature. If the equipment is charged with R407C gas, only the refrigerant that evaporates most easily is charged, while the rest of the refrigerants remain in the cylinder.

Do not use cylinders with a siphon upside-down. When using a cylinder with a siphon, R407C is charged in a liquid state without the cylinder being turned upsidedown. Check the label on the cylinder for information about the type of cylinder before the operation. (Cylinders with siphons manufactured by Asahi Glass are shown on Page 18)

cylinder with a siphon

Cylinder color R407C-Brown

Cylinder

cylinder without a siphon

Use liquid refrigerant

Valve Valve

Liquid Liquid

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Enlargement

Valve

Liquid

R407C Cylinder with siphon: Manufactured by Asahi Glass

Caution

The cylinders shown below are equipped with siphons. When using this type of cylinders, place the cylinder with the siphon facing up.

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Drier

Direction of the flow Top to bottom

ø 9.52

Flare connection

ø 12.7

Flare connection

Replacing the Drier

What to Do When Refrigerant Leaks

As with conventional air-conditioning units, refrigerant can be added to what remains in the circuit, for the unit is equipped with a CS circuit (Circulating-Refrigerant-Composition-Detector) Refer to section X of this handbook for more information.

✻ When using water-cooled heat-source unit, please note that CS circuit is only found on the inverter side, but not

on the constant-rate side.

1. Replace the drier when the refrigerant circuit is opened. Only use the drier specified for this unit. The use of any other drier will cause malfunctions.

2. Install the drier as shown in the photograph below. Do not attach driers to a pipe; doing so may cause problems.

3. Do not leave the refrigerant circuit open for longer than one hour after removing the old drier. The replacement of the drier should be performed last when performing multiple jobs.

Page 21

- 20 -

. Restrictions

System Restrictions and System Configuration

Each unit of the Split-Type Air Conditioners for Computer Rooms comes as a part of a system. For each unit to be integrated into the system, the system requires a series of switch setting. Be sure to read the following to properly configure the system.

[1] Switch Setting

(1) Types of Switches

✻ Inside indoor units, there is a control board for each refrigerant system.

Be sure to set the address for each of the control board.

2 Two or more identical addresses cannot coexist in the same system. If two or more of the same address

are used, the unit will not run properly.

(3) How to Set the Switches

1 Address Switch

(2) Notes on Switch Setting

1 Cut off the power supply before changing switch settings.

If the settings are changed while power is supplied to the unit, the change will not take effect, and it will cause the unit to malfunction.

Type Outdoor Unit Indoor Unit

Address Switch rotary

™™

✻1

Power-Source Switch Connector 4-Pin connector CN40

™

Switches to Be Operated Cut off the power supply to

Outdoor Unit Outdoor unit

Indoor Unit Outdoor and Indoor Units

Unit Type

Setting

Range

Digits Setting Method

Factory

Setting

Indoor Unit 1-50 2

(the hundred's digit is always set to 0)

Outdoor Unit 51-100 2

(the hundred's digit is always set to 0)

· Use numbers between 1-50.

All the indoor units controlled by the same centralized

controller should be assigned sequential numbers starting with 01.

· Only use odd numbers to set the top controller of the

indoor unit.

· To set the bottom controller of indoor units, add one to

the address of the top controller in the same unit. If P250 and P500 systems coexist, Refer to P34.

· The address for the outdoor unit should equal the

address the of the indoor controller address in the same refrigerant system plus 50.

Page 22

- 21 -

(4) Example

Below is a typical setting of a system

Outdoor Units

Indoor UnitsController board

DC12V Powe r supply line

Powe r

supply

unit

G-50A

0 1

57 07

59 09

Group 1

Group 2

Group 3

✻ There are two

controller boards inside indoor units. (for P500 type)

✻ There are one

controller board inside indoor units. (for P250 type)

SW12 SW11

Unit Address

10´s

Digits

Single

digits

Switch Setting

1 Set indoor unit address

using sequential numbers. (P500 only)

2 To set the address for the

outdoor unit, add 50 to the address for the indoor unit to which the outdoor unit is connected.

Diagram Comments

Page 23

- 22 -

b) The control box cover consists of two parts (top and bottom parts). Each can be removed separately

by unscrewing two screws and pulling the cover down. Connectors and dipswitches on the main board can be operated by removing only the top part. Only remove the bottom part when servicing power supply lines and transmission lines.

a) Remove the service panel by unscrewing the 6 screws as shown in the picture on the right.

(2) Control Box and Location of Terminals

1 Outdoor Unit

Front Panel

Restrictions on Transmission Lines

[1] Electrical Wiring

(1) Attention

1 Follow ordinance of your governmental organization for technical standard related to electrical equipment,

wiring regulations, and guidance of each electric power company.

2 Wiring for control (hereinafter referred to as transmission line) shall be (5cm or more) apart from power

source wiring so that it is not influenced by electric noise from power source wiring.(Do not insert transmission line and power source wire in the same conduit.)

4 Give some allowance to wiring for electrical part box of indoor and outdoor units, because the box is

sometimes removed at the time of service work.

5 Never connect 380~415V(220~240V )power source to terminal block of transmission line.If

connected,electrical parts will be burnt out

6 Use 2-core shield cable for transmission line. If transmission lines of different systems are wired with the

same multiplecore cable, the resultant poor transmitting and receiving will cause erroneous operations.

NOOK

TB3

TB7

TB3

TB7

TB3

TB7

TB3

TB7

Multiple-core Cable

2-core Cable

Indoor Unit

Outdoor Unit

Page 24

- 23 -

2 How to Use Conduit Mounting Plates

Conduit mounting plates (

ø 27, ø 33, ø 40) are packaged with the unit. Use an appropriate plate depend-

ing on the diameter of the wire used. Mount the plate as shown below.

3 How to Mount the Attachment Plate

When using either the left or front knock-out holes for both power-supply line and transmission line, screw on an attachment plate with two screws (see below). Fix the power-supply line with the bottom clamp, and fix the transmission line with the top clamp.

Front side

Controller

box

Transmission line

Power-Source line

Attachment plate

Use this hole when threading the wire through the bottom hole

ø33 mounting plate

40 mounting plate

ø27 mounting plate

ø33 mounting plate

33 mounting plate

ø40

knockout hole

Tapping screw

Front Side of the Panel

Use this hole when threading the wire through the front hole.

Page 25

- 24 -

Transmission line is a type of control line. When the source of noise is located adjacent to the unit, the use of shield cable as well as moving the unit as far away from the noise source are recommended.

1 Transmission line (M-NET transmission line)

For multiple-refrigerant system

Length of transmission line

Facility type (noise level measurement)

No. of cable 2-core cable

Diameter Over 1.25mm

Wiring specifications

All types of facilities

n/a

Shield cable CVVS · CPEVS

System component

Maximum length: 200m Maximum length of centralized control transmission line and Indoor/Outdoor transmission line via indoor/outdoor units: 500m maximum

Total length of indoor/outdoor transmission line

Cable type

(4) Types of switch settings and setting methods

Whether a particular system requires switch settings depends on its components. Refer to the section “(5) Examples” before conducting electrical work. Keep the power turned off while setting the switches. If settings are changed while being powered, the changed settings will not register, and the unit may malfunction.

Symbol

Outdoor unit OC

Indoor unit

✻ 10HP has only the main controller

Main/sub controllers ✻ IC

Turn off the power to

Outdoor unit

Indoor and outdoor units

Unit

2 Remote control wiring

MA remote controller ✻ 1

No. of cable 2-core cable

Diameter

0.3

~1.25mm

(0.75~1.25mm2)

✻ 2 ✻ 3

Wiring specifications

CVV

Maximum length: 200 m

Total Length

✻ 1: “MA remote controller” includes MA remote controller, Simple MA controller, and wireless remote controller. ✻ 2: Cables with a diameter of 0.75mm

or smaller recommended for easier handling.

✻ 3: When connecting to simple remote controller terminal, use a cable with a diameter within the range shown in

the parenthesis.

Cable type

(3) Control Wiring

Page 26

- 25 -

1 Address setting

This system requires address setting. The range of address varies depending on the type of unit. Refer to “(5) Examples” for details.

3 Choosing the temperature detection spot by indoor unit (Factory Setting: SWC “Standard”)

When using the suction temperature sensor, set SWC to “Option.”

4 Setting the MA “Sub” controller

When using two remote controllers or running two indoor units as a group, one of the controllers must be set to “Sub” controller. ✻ No more than two remote controllers can be connected to a group.

(Factory setting: “Main”) Set the controller according to the following procedure. Refer also to the instructions manual supplied with the MA remote controller.

Factory

setting

Indoor unit

Main/sub controllers

✻ 1

Symbol Setting method

Address

setting range

~50

✻ 2

~100

✻ 2 ✻ 3

Unit

Outdoor Unit

✻ 1: 10HP only has the main controller. ✻ 2: Avoid using the same address as the ones used by the indoor/outdoor units in another refrigerant system; choose a different

one in the range specified above.

✻ 3: When setting the address to 100, set the switch to 50.

Assign a number to all indoor units, starting with 1 and using sequential numbers. Use odd numbers for the top controller and even numbers for the bottom controller of the indoor units. Use odd numbers starting with 01 for 10HP system.

Add 50 to the address assigned to the indoor unit to which the outdoor or heat-source unit is connected.

2 Setting the outdoor unit power-source switch connector (Factory setting: CN41 Connected)

Power supply switch unit

Replace the power source switch connector CN41 with CN40 on only one of the outdoor units

Use CN41 as it is.

System component

Multiple-refrigerant system

Remote controller bodyDip switches

1ON234

Screwdriver

Remove the cover on the remote controller

Set Dip Switch No.1 on the remote controller to “OFF” (Main to Sub)

Insert a flat-head screwdriver in the groove shown in the picture, and move the screwdriver in the direction shown in the arrow.

Page 27

- 26 -

(5) Examples

System Using MA Remote Controller

(1) System with one indoor unit (10HP system)

Remarks Maximum Allowable Length

Control Wiring Diagram

<a. Indoor/Outdoor transmission line>

Maximum Length (above 1.25mm

)

L1 200m

1. Use power supply connector (CN41) on the outdoor unit as is.

2. It is not necessary to ground the S terminal of centralized control transmission terminal board (TB7) on the outdoor unit.

3. The outdoor unit cannot be connected to indoor units other than the PFD-type ones.

TB3

TB7

EAB

ABS

TB5-1 ABS

TB15

A1 B2

Use CN41 as is.

✻There is one indoor controller board inside indoor unit.

Page 28

- 27 -

Wiring and Address Setting

<a. Indoor/Outdoor Transmission Lines >

Connect A, B terminals of indoor/outdoor transmission line terminal board (TB3) on the outdoor unit and A, B terminals of the Indoor/outdoor transmission terminal board (TB5). (Non-polar 2 wire) ✻ Only use shield line.

[Grounding the shield line]

Connect the earth terminal of the OC and S terminal of the IC terminal board (TB5).

<b. Switch Setting >

Set the address as follows.

MA remote controller

Sub Controller

Main ControllerMAMA

n/a

Main

Unit or Controller

Address

Setting Range

Steps

Factory Setting

Setting Procedures

Indoor Unit

Outdoor Unit

Main Unit IC

Remarks

51 ~ 100

Sub controller

01 ~ 50 00

Set the address for the controller at the top of the indoor unit. Start with "01" then use sequential odd numbers (i.e.01, 03, 05).

Add 50 to the address assigned to the indoor unit within the same refrigerant system.

Use dipswitch to set the controller as sub controller.

Page 29

System Using MA Remote Controller

(2) Unit with One Indoor Unit (20HP Systems)

Remarks Maximum Allowable Length

Control Wiring Diagram

1. Use sequential numbers to set indoor unit address.

2. Do not connect TB5s' of the indoor units that are connected to different outdoor units with each other.

3. Replace CN41 with CN40 on only one outdoor unit.

4. Ground only one of the outdoor units' S terminal of TB7 (centralized control transmission terminal).

5. The outdoor unit cannot be connected to indoor units other than the PFD-type ones.

<a. Indoor/Outdoor transmission line>

Maximum Length (above 1.25mm

)

L1, L2 200m

<b. Transmission line for centralized control>

Maximum length via outdoor unit (over 1.25mm

)

L1 + L3 + L2 500m

TB3

TB7

EAB

ABS

TB5-1 ABS

TB5-2 ABS

TB15

A1 B2

TB3

TB7

EAB

ABS

L31

Use CN41 as is.

✻There are 2 indoor controller boards inside indoor unit.

Replace CN41 with CN40.

Conect

- 28 -

Page 30

Wiring and Address Setting

<a. Indoor/Outdoor Transmission Lines >

[Grounding the shield line]

Connect the earth terminal of the OC and S terminal of the IC terminal board (TB5).

<b. Transmission Line for Centralized Control >

Connect A terminals of centralized control transmission line terminal board on each of the outdoor units with each other. Do the same with B terminals. Replace CN41 (power supply switch connector) with CN40 on only one OC. ✻Only use shield line.

[Grounding the shield line]

Connect S terminals of the TB7 of each of the outdoor units with each other. Connect the S terminal of TB7 on the outdoor unit whose CN41 was replaced with CN40 to the earth terminal of the electric box.

<c. Switch Setting >

Set the address as follows.

MA remote controller

Sub Controller

Main ControllerMAMA

n/a

Main

Unit or Controller

Address

Setting Range

Steps

Factory Setting

Setting Procedures

Indoor Unit

Outdoor Unit

Main Unit IC

Remarks

51 ~ 100

Sub controller

01 ~ 49

Set the address for the controller at the top of the indoor unit. Start with "01" then use sequential odd numbers (i.e.01, 03, 05).

Add 50 to the address assigned to the indoor unit within the same refrigerant system.

Use dipswitch to set the controller as sub controller.

Sub Unit IC 02 ~ 50

Add 1 to the address assigned to the main unit in the same room.

- 29 -

Page 31

System Using MA Remote Controller

(3) When connecting 2 MA remote controller to one indoor unit (20HP Systems)

Remarks Maximum Allowable Length

Control Wiring Diagram

1. Use sequential numbers to set indoor unit address.

2. Do not connect TB5s' of the indoor units that are connected to different outdoor units with each other.

3. Replace CN41 with CN40 on only one outdoor unit.

4. Ground only one of the outdoor units' S terminal of TB7 (centralized control transmission terminal).

5. No more than two main and sub controllers can be connected to the indoor unit in the same group.

Disconnect the MA remote control wire from TB15 if

using more than 2 remote controllers.

6. The outdoor unit cannot be connected to indoor units other than the PFD-type ones.

<a. Indoor/outdoor transmission line >

Same as (2).

<b. Transmission line for centralized control >

Same as (2).

<c. MA remote controller wiring >

Maximum allowable length (0.3

~ 1.25mm2)

m1 + m2 200m

TB3

TB7

EAB

ABS

MA(Main)

TB5-1

ABS

TB5-2 ABS

TB15

A1 B2

MA(Sub)

A1 B2

TB3

TB7

EAB

ABS

L31

Use CN41 as is

✻There are 2 indoor controller boards inside indoor unit.

Replace CN41 with CN40

Connect

m1m2

- 30 -

Page 32

Wiring and Address Setting

<a. Indoor/Outdoor Transmission Line >

Same as (2).

<b. Transmission Line for Centralized Control >

Same as (2).

<c. MA Remote Controller Wiring >

[When using 2 remote controllers]

When using two remote controllers, connect terminals 1 and 2 of TB15 on the indoor unit to terminal board of MA controller(option). ✻ Set the connected MA remote controller (option) as sub controller (Refer to manual that came with MA remote

controller.)

<d. Switch Setting >

Set the address as follows.

MA remote controller

Sub Controller

Main ControllerMAMA

n/a

Main

Unit or Controller

Address

Setting Range

Steps

Factory Setting

Setting Procedures

Indoor Unit

Outdoor Unit

Main Unit IC

Remarks

51 ~ 100

Sub controller

01 ~ 49

Set the address for the controller at the top of the indoor unit. Start with "01" then use sequential odd numbers (i.e.01, 03, 05).

Add 50 to the address assigned to the indoor unit within the same refrigerant system.

Use dipswitch to set the controller as sub controller.

Sub Unit IC 02 ~ 50

Add 1 to the address assigned to the main unit in the same room.

- 31 -

Page 33

System Using MA Remote Controller

(4) When grouping 2 indoor units (20HP systems) with MA remote controller

Remarks Maximum Allowable Length

Control Wiring Diagram

1. Use sequential numbers to set indoor unit address.

2. Do not connect TB5s' of the indoor units that are connected to different outdoor units with each other.

3. Replace CN41 with CN40 on only one outdoor unit.

4. Ground only one of the outdoor units' S terminal of TB7 (centralized control transmission terminal).

5. No more than two main and sub controllers can be connected to the indoor unit in the same group.

Disconnect the MA remote control wire from TB15 if

using more than 2 remote controllers.

6. The outdoor unit cannot be connected to indoor units other than the PFD-type ones.

<a. Indoor/outdoor transmission line >

Same as (2).

<b. Transmission line for centralized control >

Same as (2).

<c. MA remote controller wiring >

Maximum allowable length (0.3

~ 1.25mm2)

m1 + m2 + m3 200m

NO NO

TB3

TB7

EAB

ABS

(Main)

TB5-1 ABS

TB5-2

ABS

TB15

A1 B2

TB3

TB7

EAB

ABS

TB3

TB7

EAB

ABS

MA(Sub)

TB5-1 ABS

TB5-2 ABS

TB15

A1 B2

TB3

TB7

EAB

ABS

L31

Use CN41 as is.

✻There are two indoor controller board inside each indoor unit.

Replace CN41 with CN40.

Use CN41 as is.

Replace CN41 with CN40.

Connect Connect

- 32 -

Page 34

Wiring and Address Setting

<a. Indoor/Outdoor transmission line >

Same as (2).

<b. Transmission Line for Centralized Control >

Same as (2).

<c. MA remote controller line >

✻ When grouping units that use different refrigerants, set MA remote controller of one of the indoor units as sub

controller.

[When grouping indoor units]

When grouping indoor units, connect 1 and 2 terminals of both IC terminal boards (TB15) with each other (non- polar 2 line). ✻ Set MA remote controller of one of the indoor units as sub controller.

<d. Switch Setting >

Set the address as follows.

MA remote controller

Sub Controller

Main ControllerMAMA

n/a

Main

Unit or Controller

Address

Setting Range

Steps

Factory

Setting

Setting Procedures

Indoor Unit

Outdoor Unit

Main Unit IC

Remarks

51 ~ 100

Sub controller

01 ~ 49

Set the address for the controller at the top of the indoor unit. Start with "01" then use sequential odd numbers (i.e.01, 03, 05).

Add 50 to the address assigned to the indoor unit within the same refrigerant system.

Use dipswitch to set the controller as sub controller.

Sub Unit IC 02 ~ 50

Add 1 to the address assigned to the main unit in the same room.

- 33 -

Page 35

System Using MA Remote Controller

(5) When grouping multiple indoor units (combination of 10HP, 20HP systems)

Remarks Maximum Allowable Length

Control Wiring Diagram

<a. Indoor/Outdoor Transmission Line >

Same as (2).

<b. Transmission Line for Centralized Control >

Same as (2).

<c. MA Remote Controller Line >

Total Length (0.3

~ 1.25mm2)

m1 + m2 + m3 + m4 + m5 200m

MA(Main)

TB15

TB3

TB7

EAB

ABS

MA(Sub)

TB5-1

ABS

TB5-2

ABS

TB15

A1 B2

TB3

TB7

EAB

ABS

TB3

TB7

EAB

ABS

TB5-1

ABS

Use CN41 as is

L31

✻

There are two indoor controller

boards inside indoor unit.

Use CN41 as is.

Replace CN41 with CN40.

✻

There is one indoor controller

board inside indoor unit.

Connect

1. Use odd numbers to set 10HP indoor unit address.

2. When setting unit address for 20HP indoor unit, use odd numbers for the top controllers and even numbers for the bottom controllers (main controller+1).

3. Replace CN41 (power supply switch connector) with CN40 on only one 20HP outdoor unit.

4. Ground the S terminal of TB7 (centralized control transmission terminal board) of only one of the 20HP outdoor units.

5. No more than two main and sub controllers can be connected to the indoor unit in the same group.

Disconnect the MA remote control wire from TB15 if

using more than 2 remote controllers.

6. The outdoor unit cannot be connected to indoor units other than the PFD-type ones.

- 34 -

Page 36

Control Wiring Diagram

NO NO

TB15

A1B2

TB3

TB7

EAB

ABS

TB5-1

ABS

TB5-2

ABS

TB15

A1B2

TB3

TB7

EAB

ABS

TB3

TB7

EAB

ABS

TB5-1

ABS

Use CN41 as is

L31

m5m4

✻

There are two indoor controller

board inside indoor unit.

Use CN41 as is.

Replace CN41 with CN40.

✻

There is one indoor controller

board inside indoor unit.

Connect

MA remote controller

Sub Controller

Main ControllerMAMA

n/a

Main

Unit or Controller

Address

Setting Range

Steps

Factory Setting

Setting Procedures

Indoor Unit

Outdoor Unit

Main Unit (10HP, 20HP)

Remarks

51 ~ 100

Sub controller

01 ~ 49

Set the address for the controller at the top of the indoor unit. Start with "01" then use sequential odd numbers (i.e.01, 03, 05).

Add 50 to the address assigned to the indoor unit within the same refrigerant system.

Use dipswitch to set the controller as sub controller.

Sub Unit (20HP)

IC 02 ~ 50

Add 1 to the address assigned to the main unit in the same room.

- 35 -

Page 37

- 36 -

System with MA remote controller and G-50A

(1) System with multiple indoor units (10HP, 20HP)

Remarks Maximum Allowable Length

Control Wiring Diagram

<a. Indoor/Outdoor transmission line>

L1, L2, L3, L4, L5, L6 200m

<b. Transmission Line for Centralized Control >

L31 + L32 + L33 + L35 + L36 + L37 + L38 + L6

500m

L1 + L31 + L35 + L36 + L37 + L38 + L6

500m

<c. MA Remote Controller Line >

Total Length (0.3

~ 1.25mm2)

m1 200m

1. Be sure to use odd numbers to set the address for indoor units

(10HP).

2. To set the indoor unit address for 20HP, use odd numbers for

the top controllers and use even numbers for the bottom controllers (Main controller plus 1).

3. Use the power supply switch connector (CN41) on the outdoor

unit as is.

4. It is not necessary to ground the S terminal of transmission line

terminal board for centralized controller on the outdoor unit.

5. No more than two main/sub remote controllers can be

connected to the indoor unit in the same group. When more than two remote controllers are present in the system, disconnect MA remote controller from TB15 in the indoor unit.

6. Put both types of the addresses for P500-type indoor units in

the same group when setting groups for indoor units with a remote controller.

7. The outdoor unit cannot be connected to indoor units other than the PFD-type ones.

TB15

A1 B2

TB3

TB7

EAB

ABS

TB5-1 ABS

TB5-2 ABS

TB15

A1 B2

TB3

TB7

EAB

ABS

TB3

TB7

EAB

ABS

TB5-1 ABS

Use CN41 as is.

Power Supply

ABS

G-50A

ABS

L32L33

Option

DC power supply line (DC12V)

L35

Use CN41 as is.

✻There is one indoor controller board inside indoor unit.

✻There are two indoor controller boards inside indoor unit.

L31

L36

Page 38

- 37 -

Control Wiring Diagram

MA remote controller

Sub Controller

Main ControllerMAMA

n/a

Main

Unit or Controller

Address

Setting Range

Steps

Factory Setting

Setting Procedures

Indoor Unit

Outdoor Unit

Main Unit (10HP, 20HP)

Remarks

51 ~ 100

Sub controller

01 ~ 49

Set the address for the controller at the top of the indoor unit. Start with "01" then use sequential odd numbers (i.e.01, 03, 05).

Add 50 to the address assigned to the indoor unit within the same refrigerant system.

Use dipswitch to set the controller as sub controller.

Sub Unit (20HP)

IC 02 ~ 50

Add 1 to the address assigned to the main unit in the same room.

TB15

A1 B2

TB3

TB7

EAB

ABS

TB5-1 ABS

TB5-2 ABS

TB15

A1 B2

TB3

TB7

EAB

ABS

TB3

TB7

EAB

ABS

TB5-1 ABS

L38

Use CN41 as is. Use CN41 as is.

Use CN41 as is.

✻There is one indoor controller board inside indoor unit.

✻There are two indoor controller boards inside indoor unit.

L37

Page 39

- 38 -

Outdoor Unit

Indoor Unit

Sample Unit Connection

Maximum Pipe Length (L)

Maximum Height Difference Between Indoor and outdoor units (H)

Total length: 120m Equivalent length: 150m

■ Selecting Refrigerant Pipes

< P250 Type >

Outdoor Unit

Indoor Unit

Total length: 120m Equivalent length: 150m

< P500 Type >

Under 50m (Under 40m if the outdoor unit is installed below the indoor unit. Under 15m if the outdoor temperature is under 10˚C.)

Gas pipe: ø 28.58 Liquid pipe: ø 12.7

Gas pipe: ø 28.58 ✕ 2 Liquid pipe: ø 12.7 ✕ 2

Warning

Exercise caution so that refrigerant R407C does not leak around fire. When exposed to an open flame, refrigerant can produce noxious gases and subject the personnel to gas poisoning. Provide adequate ventilation during welding. Also, check for possible gas leak after the installation of refrigerant piping has been completed.

When using two refrigerant circuits, make sure that gas pipes and liquid pipes do not get cross-connected to each other by accident.

• Doing so will damage the unit.

• If refrigerant other than R407C is used or if air enters the

cycle, the system malfunctions and the pipes may explode.

Do not use refrigerant other than R407C.

Store the piping to be used during installation indoors and keep both ends of the piping sealed until immediately before blazing. (Keep elbows and other joints wrapped in plastic.)

• If refrigerant is contaminated with dust, dirt, or moisture, refrigerator oil will deteriorate and problems with compressor may result.

Use refrigerant pipes made of C1220 phosphorus deoxidized copper categorized under H3300 (Copper and Copper Alloy Seamless Pipes and Tubes), a standard set by JIS.

• Keep inner and outer surfaces of the pipes clean and free of contaminants such as sulfur, oxides, dust/dirt, shaving particles, oils, and moisture.

• Contaminants inside the refrigerant piping will deteriorate the refrigerant oil.

Do not use a charging cylinder.

• The use of charging cylinder will change the composition of the refrigerant and lead to power loss.

Do not use a charging cylinder.

• The use of charging cylinder will change the composition of the refrigerant and lead to power loss.

Use liquid refrigerant to charge the circuit.

• Charging the system with gas refrigerant will change the

composition of the refrigerant in the cylinder and will lead to a drop in performance.

Do not use the existing refrigerant piping.

• The old refrigerant and refrigerator oil in the existing piping contain a large amount of chlorine, which may cause the refrigerator oil of the new unit to deteriorate.

Caution

Restrictions on Refrigerant Pipe Length

There are two types of refrigerant circuits: one with one refrigerant circuit and another with two refrigerant circuits. The former consists of refrigerant piping from one outdoor unit connected to an indoor unit (P250), and the latter consists of refrigerant piping from two outdoor units connected to an indoor unit (P500). Use flange connection for gas pipes, and use flare connection for liquid pipes for both indoor and outdoor units.

[1] Refrigerant Piping

Page 40

- 39 -

. Components of the Unit

Internal Structure

< PUD-P250YMF-C >

PUD-YMF-C

Propeller fan

Fan motor

Compressor

Heat exchanger(front)

Control box

Heat exchanger(rear)

SCC

Accumulator

Compressor

Drier

Page 41

- 40 -

< PFD-P250VM-A >

(1) Front

(2) Back

Heat exchanger ✕2 (front/back)

Fan motor

Suction temperature thermistor

V belt

Discharge temperature thermistor

(on the back of the controller)

Bearing

Fan casing

Linear expansion valve (LEV)

Main drain pan

Pipes (gas/liquid)

Drain hose

Pulley

✕2

Remote

control

Controller

Base (Drain pan)

Pipes (gas/liquid)

Drain hose

Bearing

Air filter

Drain pan fixation point Float switch

Float switch

Page 42

- 41 -

(2) Back

< PFD-P500VM-A >

(1) Front

Heat exchanger ✕2 (front:No. 1; back:No. 2)

Fan motor

Suction temperature thermistor ✕2

V belt

Bearing

Fan casing ✕2

Linear expansion valve (LEV) ✕2

Main drain pan

Pipes (gas/liquid) ✕2

Drain hose

Base (Drain pan)

Pulley ✕2

Discharge temperature thermistor ✕2

Local

switch

Controller

Air filter

Bearing

Drain hose

Pipes (gas/liquid) ✕2

Drain pan fixation pointFloat switch ✕2

Float switch ✕2

Page 43

- 42 -

Control Box

< PUD-P250YMF-C >

FANCON board

INV board

MAIN board

Noise filter

Choke coil (L2)

Terminal block TB1A Power Source

Terminal block TB7 Transmission (Centralized control)

Terminal block TB3 Transmission

Inteligent Power Module (IPM)

G/A board

Diode stack (DS)

Magnetic contactor (52C)

Capacitor (C2, C3) (Smoothing capacitor)

Page 44

- 43 -

<PFD-P250VM-A >

< PFD-P500VM-A >

normal

local

CNV

CN23

CN3T

CND

CNT

CN70

CN24

CN42

CN81

CN60

CN25

CN31

CN3A

CN20 CN21

CN29

CN2M

PFD-P250VM-A

250V

5A F

250V

1A F

F1F4

Input/output

connector

Transformer

Terminal block (Transmission) (Top) Terminal block (MA remote control) (Bottom)

Electro magnetic contactor (52F)

Surge breaker (51F)

Indicator lamp wiring

Motor wiring

Surge absorber board

Remote controller

Power supply terminal bed

Fuse

Varistor (ZNR2)

Controller boardAddress board

✻ Back of remote

controller Relay (X11,Z1,Z3)

Switch (normal/local)

NO.1

NO.2

local

normal

CN2

CN3

CN31

CN25

CN60

CN81

CN42

CN24

CN70

CNT

CND

CN3T

CN23

CNV

1A 5A

PFD-P500VM-A

250V

5A F

250V

1A F

F1F4

SB1A1

FuseSurge absorber

board

Remote controller

Input/output

connector

Address board ✕2

(top:No.1;

bottom:No.2)

Electro magnetic contactor (52F)

Surge breaker (51F)

Indicator lamp wiring

Motor wiring

Transformer

✕2

Controller board ✕2 (top:No.1; bottom:No.2)

No.2-side terminal block (transmission) (top) Terminal block (MA remote controller) (bottom)

No.1-side terminal block (transmission)

Power supply terminal bed

Switch (normal/local)

✻ Back of remote

controller

· Relay

(X11, X12, Z1, Z2, Z3)

· Fuse (5A)

Varistor (ZNR2)

Page 45

- 44 -

Main Board

< PUD-P250YMF-C >

Main Board

CNTR CNFC1

CNVCC4 Power source for control(5V)

CNS1 CNS2 CN40 CN41 CNVCC3

Power source for control(5V)

1-2 30V 1-3 30V 4-6 12V 5-6 5V

CN51 Indication distance 3-4 Compressor ON/OFF 3-5 Trouble

CNRS3 Serial transmission to INV board

CN3D

CN3S

CN3N

LD1 Service LED

SW1SWU1SWU2SW2SW3SW4CN20

Power supply

3 L1 1 N

Page 46

- 45 -

INV Board

CNVDC 1-4 DC-560V

CN15V2 Power source for IPM control

CNVCC2 Power supply for control(5V)

1-2 30V, 1-3 30V 4-6 12V, 5-6 5V

SW1 CNRS2

Serial transmission to MAIN board

CNACCT

CNAC2 Powe r supply

1 L2 3 N 5 G

CNFAN Control for MF1

CN52C Control for 52C

CNR

CNVCC4 Power supply(5V)

CNTH

CNDR2 Out put to G/A board

CNL2 Choke coil

Page 47

- 46 -

FANCON Board

G/A Board

CNFAN

CNFC2

CNPOW

CNE

CNIPM1

CNDC1

CN15V1

CNDR1

Page 48

- 47 -

CN70 Fan output

CN24 Control signal output

CN23 FAN error input

CN32 Switch input

CN42,81 to address board

SW2,3,4 Dip switch

LED1

CN52 Switch input

CN51 Switch input

CN31 Float switch input

CN20 CN21 CN29 CN22

Thermistor input

CN3T Power supply input (from transformer)

CNV.CNP Lamp output

CNT Power supply output (to transformer)

CND Power supply input

(AC 200V)

F901 Fuse

CN2M Indoor unit transmission line

LED2

CN60 LEV output

SW12,11 Address switch

SW1 Dip switch

CN82,62 to Indoor control board

SWC Discharge/suction control switch

< PFD-P250,500VM-A >

Indoor Control Board

Indoor Address Board

Page 49

- 48 -

External Input/Output Circuit Board

CN53 Indoor control board (No.1) To CN51

CN54 Indoor control board (No.2) To CN51

TB22 (Relay contact output) No.1 operation status No.1 error status No.2 operation status No.2 error status

TB23 (Input with voltage) ON/OFF

TB21 (Input no voltage) ON/OFF

Page 50

- 49 -

. Electrical Wiring Diagrams

Outdoor Unit

(1) PUD-P250YMF-C

FB4

X1~10

Motor

(Compressor)

MC1

Inverter

TH6

TH9TH10

SLEV

63LS

321

63HS

TH2

TH1

321

LEV1

TH7TH8TH5

ACCT

-W

BOX BODY

CNE

(2P)

X06

12345

(6P)

CN36

342

31245

BOX BODY

High pressure

switch

Crank case heater

(Compressor)

Diode

stack

Noise

Filter

Terminal

Block

Terminal

Block

CNFC2

(6P)

12345

circuit

detection

12345

Blue

Black

White

Red

Blue

Black

Red

White

TB1B

BOX BODY

CN06

(2P)

CN34

(6P)

65432

123

CN38

(3P)

X10

X05

63H

(2P)

(6P)

CNFC1

CN09

Control circuit board

Blue

Red

White

Black

Brown

Red

Controller Box

BOX BODY

(INV board)

Power circuit board

MF1

(2P)

CN30V

(2P)

CNL2

(14P)

CN15V2

(5P)

CNLV2

(3P)

CNTR

(5P)

CNLV1

(3P)

CN32

(3P)

CNL

(3P)

CNH

(2P)

CN01

THHS

(8P)

CN02

(3P)

CN03

(3P)

CNFAN

(7P)

CNRS3

(6P)

CNVCC2

(6P)

CNVCC3

(2P)

CNVCC4

(7P)

CNRS2

X10

X01

X02

52C

32165

1234567

12143

23 12 123 1

Black

Red

White

CNTR1

1A F

250VAC

T01

DCL

52C

ZNR4

+~–~

TB7

TB3

controller

remote

Indoor and

Connect to

Yellow

Green/

Blue

Black

Red

White

Red

White

Black

Red

White

Black

2A F

250VAC

TB1A

CH1

SV1

(MAIN board)

50/60Hz

380/400/415V

3N~

Power source

4:Compressor ON/OFF

5:Trouble

12V

X01

X02

(2P)

CNTH

(4P)

CNVDC

(3P)

CN52C

(3P)

CNR

(3P)

CNX10

(3P)

CNS2

(5P)

CNAC2

(5P)

CN51

(2P)

CNS1

(2P)

CNVCC4

122

322

(3P)

CN20

(3P)

CN33

2A F

250VAC

F01

5322413

543215432132132

1122181

763211

423342

SV2

Refer to the service handbook

about the switch operations.

CNDC1

(4P)

1234

CNDR2

(9P)

121011 13 14543216789 54321 6789

121011 13 14543216789 543216789

Yellow Orange

Purple Black

White Gray

123

Fan motor

(Heat exchanger)

UVW

Gate amp board

(G/A board)

FB1

FB2

FB3

IPM

CNDR1

(9P)

CN15V1

(14P)

Orange Brown

CNACCT

(4P)

(5P)

CNFAN

CN04

no fuse breaker

30APUD-P250YMF-C

ACCT

-U

Green

NL3L2L1

L1 L2 L3

32451

CNPOW

(5P)

(Fancon board)

Fan control board

F01 250VAC 6.3AF

F02 250VAC 6.3AF

F03 250VAC 6.3AF

MF1

52C

ZNR4

ACCT-U, W

DCL

Symbol Name

21S4

SV1, SV2

(Sub-cool coil bypass)

LEV1 Electronic expansion valve

IPM

SLEV

63HS

63LS

SV3

TH9

at Sub-cool coil

bypass outlet temp. detectTH8

TH7

TH6

TH5

TH1

TH2

TH10

THHS

FB1~4

Solenoid valve(Discharge-suction bypass)

4-way valve

Electronic expansion valve(Oil return)

High pressure sensor

Low pressure sensor

(Heat exchanger capacity control)

Solenoid valve

Varistor

(Power factor improvement)

DC reactor

Current Sensor

Ferrite core

Fan motor(Radiator panel)

(Inverter main circuit)

Magnetic contactor

Choke coil(Transmission)

Intelligent power module

Discharge pipe temp. detect

Radiator panel temp. detect

Compressor shell temp.

High pressure liquid temp.

OA temp. detect

Pipe temp. detect

Saturation evapo. temp. detect

Thermistor

Earth terminal

Aux. relay

liquid outlet temp. detect

at Sub-cool coil

SV3

Page 51

- 50 -

54321

CN54

31254

CN53

54321

IFB

Power supply DC12 ~ 24V

Power supply

Failure output

Status output

Distant location on/off

CN3A

(CN54)

ZNR

X06 X05 X04

321

CN3T

1331

553

CNT CND CN70 FAN2

CN2M

I.B

CN32

321

CN51

12345

CN52

12345

X03

CNVCNP

X01

CN23

CN31

123

Distant location on/off

(1st digit)(2st digit)

CN62

SW4

CN42

432

4321

CN29

8712345

A.B

SW2

SW3

6543222111

65432

CN81

CN20 CN21

CN24 CN25

CN60CN22

X11

221

TH24

LEV

TH21

TH22

TH23

65432

SW14

SW12

SW11

CN82

SW1

33P1

33P2

51F

52F

(250V

5A F)

51F 52F

DC24 to 30V

A1SB1

Power supply

(No fuse breaker 20A)

3N~380/400/415V(50Hz)

400/415V(60Hz)

Inside the control box

SW8

Switch(normal/local)

X11

LED display(check)

LED display(failure)L1LED display(status)L2LED display(power supply)

216

Indoor unit

Control wiring

S.B

DSA1

CN1

F4(250V

1A F)

ZNR1

ZNR2

TB23

TB22

TB21

TB5

TB2

SHIELD

FAN

over current detection

TB15

Note: 1. The dotted lines show field wiring.

2. Always use odd numbers for the indoor unit address.

3. Connect the transmission line from indoor unit to outdoor unit whose

address equals he address of the connected indoor unit + 50.

4. Conventions: ,terminal bed; , connector; , board-insertion

connector or fastening connector of control board.

Address

(odd)

SWCSWA

TB22

IFB

Terminal bed for distant location display

Thermistor (outlet temp. detection)

Thermistor (piping temp. detection/liquid)

Thermistor (piping temp. detection/gas)

Auxiliary relay(fan)

Auxiliary relay(fan failure detection)

TB21 Terminal bed for distant location on/off

TB23 Terminal bed for distant location on/off

RC MA Remote controller

TB15 Transmission terminal bed

Symbol

TB2

I.B

A.B

TB5

External input/output board

Transmission terminal bed

Power source terminal bed

Address board

Indoor controller board

Fan motor

Name

Switch (2nd digit address set)

Switch (1st digit address set)

SWC

33P1,33P2

ZNR,ZNR1,ZNR2

LEV

52F

51F

TH21

TH22

TH23

TH24

SW11(A.B)

SW12(A.B)

SW14(A.B)

SW1(A.B)

SW2(I.B)

SW3(I.B)

SW4(I.B)

X11Z1L1L2L3

SW8 Switch (normal/local)

LED display (power supply)

LED display (check)

LED display (status)

LED display (failure)

Auxiliary relay(check)

Switch (for model selection)

Switch (for mode selection)

Switch (for capacity code)

Switch (for mode selection)

Switch (connection No.set)

Thermistor (inlet temp. detection)

Fuse<5A>

Over current relay (fan I/D)

Contactor(fan I/D)

Electronic linear expan.valve

Transformer

Varistor

Fuse<6A>

Float switch

Switch (outlet/inlet temp.control)

F4 Fuse<1A>

S.B

Surge absorber board

Indoor Unit

(1) PFD-P250VM-A

Page 52

- 51 -

(2) PFD-P500VM-A

(250V

1A F)

(250V

5A F)

Power supply

(No fuse breaker 30A)

3N~380/400/415V(50Hz)

400/415V(60Hz)

S.B

DSA1

CN1

ZNR1

B1BCA2

54321

CN54

31254

CN53

54321

Distant location on/off

Distant location on/off

No1.Indoor unit

Control wiring

X11

X12

Lamp display

(check)

IFB

SW12

(2st digit)

No2.Failure output

No2.Status output

No2.Indoor unit

Control wiring

DC24 to 30V

(1st digit)

SW11

SW12

DC24 to 30V

No1.Status output

No1.Failure output

(2st digit)

CN3A

(CN54)

ZNR

X06 X05 X04

321

CN3A

CN3T

31 1 33115533

CNT CN70 FAN2

CN2M

I.B2

ZNR

X06 X05 X04

CN3T

31 1 33115533

CNT CND CN70 FAN2

CN2M

I.B1

321

CN32

CN51

12345

CN52

12345

CN51

12345

CN52

12345

X03

CND

CNV

CNP

X01

CNP

X01

CN23

CN31

SW14

Inside the control box

12345

TH23-2

TH22-2

TH21-2

LEV2

CN82

CN62

CN42

432

4321

8712345

A.B2

SW1

65432

CN81

CN62

SW4

CN42

432

4321

CN29

8712345

A.B1

SW2

SW3

6543222111

65432

CN81

CN20 CN21

CN24 CN25

CN60CN22

TH24-2

X11

221

X12

122

CN25CN24

SW3 SW2SW4

CN22 CN60CN21CN20

11 1222 3456

CN29

CN31

CN23

TH24-1

LEV1

TH21-1

TH22-1

TH23-1

65432

SW14

CN82

SW1

51F

52F

51F 52F

Lamp display

(status)

Power supply DC30V,AC100/200V

A1SB1

Power supply DC12 ~ 24V

Lamp display

(No2.failure)

(1st digit)

SW11

Lamp display

(power supply)

Switch(normal/local)

SW8

216

Lamp display

(No1.failure)

TB23

TB22

TB21

SHIELD

TB5-1

TB2

TB5-2

FAN

over current detection

SHIELD

TB15

Address

(odd)

Address

(even)

TB22

IFB

Terminal bed for distant location display

Thermistor (outlet temp. detection)

Thermistor (piping temp. detection/liquid)

Thermistor (piping temp. detection/gas)

Auxiliary relay(fan)

Auxiliary relay(fan failure detection)

TB21 Terminal bed for distant location on/off

TB23 Terminal bed for distant location on/off

RC MA Remote controller

TB15 Transmission terminal bed

Symbol

TB2

I.B1,I.B2

A.B1,A.B2

TB5-1,-2

External input/output board

Transmission terminal bed

Power source terminal bed

Address board

Indoor controller board

Fan motor

Name

Switch (2nd digit address set)

Switch (1st digit address set)

SWC

33P1-1,-2, 33P2-1,-2

ZNR,ZNR1,ZNR2

LEV1,2

52F

51F

SW11(A.B)

SW12(A.B)

SW14(A.B)

SW1(A.B)

SW2(I.B)

SW3(I.B)

SW4(I.B)

X11

~X12

~Z2

L1L2L3

SW8

Switch (normal/local)

Lamp display (power supply)

Lamp display (check)

Lamp display (status)

Lamp display (No1.failure)

Auxiliary relay(check)

Switch (for model selection)

Switch (for mode selection)

Switch (for capacity code)

Switch (for mode selection)

Switch (connection No.set)

Thermistor (inlet temp. detection)

Fuse<5A>

Over current relay (fan I/D)

Contactor(fan I/D)

Electronic linear expan.valve

Transformer

Varistor

Fuse<6A>

Float switch

Switch (outlet/inlet temp.control)

S.B Surge absorber board

TH21-1,TH21-2

TH22-1,TH22-2

TH23-1,TH23-2

TH24-1,TH24-2

Lamp display (No2.failure)

F4 Fuse<1A>

SWA SWC

SWCSWA

Note: 1. The dotted lines show field wiring.

2. Always use odd numbers for the indoor unit address.

3. Connect the transmission line from indoor unit to outdoor unit whose

address equals he address of the connected indoor unit + 50.

4. Conventions: ,terminal bed; , connector; , board-insertion

connector or fastening connector of control board.

123

33P1-1

33P2-1

123

33P1-2

33P2-2

ZNR2

Page 53

- 52 -

. Refrigerant Circuit

Refrigerant Circuit Diagram

< PUD-P250YMF-C >

HEX 1 HEX 2

TH6

SCC

SV3

CP1

CJ1

CJ2

63HS

SV1

ST3

CV1

O/S

63H

63LS

SLEV

CP4

TH9

TH7

ST4

LEV1

Comp

Drier

TH2

TH10

CP3

CV2

TH8

TH5

SV2

ST5

TH1

CV2

HEX 1 HEX 2

TH6

SCC

SV3

CP1

CJ1

CJ2

63HS

SV1

ST3

CV1

O/S

63H

63LS

SLEV

CP4

TH9

TH7

ST4

LEV1

Comp

Drier

TH2

TH10

CP3

TH8

TH5

SV2

ST5

TH1

Outdoor unit

Air flow

ST2 BV2

ST1

BV1

gas pipe ø28.58

liquid pipe ø12.7

Indoor unit

ST2

ST1

BV2

BV1

Air flow

Page 54

- 53 -

Low pressure shell scroll type with capacity control mechanism Winding resistance: Each phase 0.388Ω (20˚C)

Setting 2.94MPa OFF

120=7.465kΩ

B25/120=4057

Rt = 7.465exp {4057( - )}

0=33kΩ

B0/100=3965 Rt = 33exp{3965( - )}

-20

˚C : 92kΩ

-10˚C : 55kΩ 0˚C : 33kΩ

10˚C : 20kΩ 20˚C : 13kΩ 30˚C : 8.2kΩ

R0=15kΩ B0/100=3460 Rt = 15exp{3460( - )}

0˚C : 15kΩ

10˚C : 9.7kΩ 20˚C : 6.4kΩ 25˚C : 5.3kΩ 30˚C : 4.3kΩ 40˚C : 3.1kΩ

63HS

63H

TH1 (discharge)

TH2 (low pressure saturation temperature)

TH5 (piping temperature)

TH6 (outdoor air temperature)

TH7 (subcool coil outlet temperature)

TH8 (subcool coil bypass outlet temperature)

TH9

Compressor

High pressure sensor

Pressure switch

Thermistor

Adjust refrigerant circulation by controlling operating frequency and capacity control valve with operating pressure.

1) High press. detection.

2) Frequency control and high pressure protection

1) High pressure detection

2) High pressure protection

1) Discharge temperature detection

2) High pressure protection

20˚C : 250kΩ 70˚C : 34kΩ 30˚C : 160kΩ 80˚C : 24kΩ 40˚C : 104kΩ 90˚C : 17.5kΩ 50˚C : 70kΩ 100˚C : 13.0kΩ 60˚C : 48kΩ 110˚C : 9.8kΩ

1) Detects the saturated vapor temperature.

2) Calculates the refrigerant circulation configuration.

3) Controls the compressor frequency.

4) Controls the outdoor unit’s fan air volume.

1) Frequency control

2) Defrost control and liquid level detection at heating

1) Outdoor air temperature detection

2) Fan control, liquid level heater, and opening setting for oil return

Subcool coil bypass LEV (LEV1) control

1) Detects the CS circuit fluid temperature.

2) Calculates the refrigerant circulation configuration.

Name Application Specification Check method

Pressure 0~2.94MPa Vout 0.5~3.5 V

Gnd (black) Vout (white) Vcc (DC5V) (red)

Connector

273+t

Continuity check

Resistance value check

Symbol

(function)

273+120

273+0

123

1 2 3

63HS

Connector

123

1 2 3

63LS

63LSLow pressure sensor

1) Detects low pressure

2) Calculates the refrigerant circulation configuration.

3) Protects the low pressure

Pressure 0~0.98MPa Vout 0.5~3.5 V

Gnd (black) Vout (white) Vcc (DC5V) (red)

List of Major Component Functions

(1) Outdoor Unit

< PUD-P250YMF-C >

Page 55

- 54 -

Cord heater AC240V MC···1280Ω 45W

AC380~415V F-type 8P Output 0.38kW

AC220~240V Opens when energized Closed when de-energized

DC12V Stepping Motor Driving Valve 0~480 pulses (direct-activy type)

TH10

THHS

SV1 (DischargeSuction Bypass)

SV2 (ChargeSuction Bypass)

SLEV (Oil Return)

LEV1 (SC Coil)

CH1 (Crankcase Heater)

Thermistor

Solenoid Valve

Electronic Expansion Valve

Heater

Motor

1) Detects compressor shell temperature

2) Compressor overheating protection

Resistance check

Controls inverter cooling fan according to THHS temperature

1) High/low pressure bypass at

starting/stopping and capacity control at low load

2) Suppresses discharge pressure

Capacity control, high pressure rise, and low pressure drop suppression (Back-up system for frequency control)

SV3 Control of heat exchanger capacity

Adjusts liquid refrigerant (oil) return from accumulator

Adjusts bypass flow from outdoor unit during cooling operation

Heating refrigerant in compressor

Controlling concentration capability

Name Application Specification Check method

Resistance check

45.5

Ω±10%

/2 phases

Continuity check with a tester

Same as LEV but the resistance level is different (Refer to LEV Troubleshooting)

Symbol

(function)

R120 =7.465kΩ B

25/120 =4057R =17

Rt = 7.465exp{4057 }

273 + t1393

20˚C 30˚C 40˚C 50˚C 60˚C

250kΩ 160kΩ 104kΩ

70kΩ 48kΩ

70˚C 80˚C

90˚C 100˚C 110˚C

34kΩ 24kΩ

17.5kΩ

13.0kΩ

9.8kΩ

R =17kΩ

B =4170 R = 17

25/120

{4170 }

273 + t1323

exp

˚C

10˚C 20˚C

181kΩ 105kΩ

64kΩ

25˚C 30˚C 40˚C

50kΩ 40kΩ 26kΩ

Thermo

W(black) V(white)

U(red)

: : : : :

: : :

Page 56

- 55 -

PFD-P250VM-A AC400V Type E 4P Output 3.7kW

PFD-P500VM-A AC400V Type B 4P Output 5.5kW

Contact Resistance:Under 250mΩ B contact type

DC12V Opening of stemming motor driving valve 0~2000 pulses

LEV

TH21 (Inlet air temp.)

TH22 (Piping temp.)

TH23 (Gas piping temp.)

TH24 (Outlet air temp.)

33P1, 33P2 33P1-1, 33P1-2 33P2-1, 33P2-2

Electronic Expansion Valve

Thermistor

Float Switch

Motor

Adjusts superheat at outdoor unit heat exchanger outlet in cooling operation

Continuity check with tester (Refer to checking) White-red-orange Yellow-brown-blue

White

Red

Orange

Yellow brown blue

Controls Indoor Unit Intake (thermostat)

Controls indoor unit (freeze prevention, Evaporating temp. detection

LEV control during cooling operation

(Superheat detection)

Controls indoor unit discharge (thermostat)

Detects drain pan water level

Sends air

Name Application Specification Check method

Resistance check

Continuity check with tester

Symbol

(function)

R =15kΩ

B =3460 R = 15

0/80

{3460( )}

273 + t1273

exp

0˚C 10˚C 20˚C 25˚C

15kΩ

9.7kΩ

6.4kΩ

5.3kΩ

30˚C 40˚C

4.3kΩ

3.1kΩ

0.45Ω±10%/2 phases

1.72Ω±10%/2 phases

: : : :

: :

(2) Indoor Unit

< PFD-P250,500VM-A >

Page 57

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Switch Function

Function according to switch operation Switch settig timing

OFF ON ON OFF

SWU

SW1

SW2

SW3

SW4

1~2 1~8

9~10

1 2

8 9

3 4

5 6

8 9

Unit address setting. Self-diagnosis/operation monitoring.

–

Deletion of connection information.

Deletion of error history.

Changing Tem change timing.

3 minutes. 5 minutes.

Refrigerant amount adjustment.

Outdoor-air sensor abnormality/refrigerant overfilling disregarded.

Stand-by mode switching.

–

– SW3-2 function valid/invalid. Indoor unit test run.

Compressor operating frequency change.

– Pump down operation.

Switching thermostat control function.

–

Switching solenoid valve SV3’s control type.

SW4-2 Function valid/invalid. Refrigerant composition correction value.

–

Set to numbers between 51 and 90 with the dial switch.

Refer to section VIII Display on the LED monitor on the outdoor unit board.

–

Storage of refrigerant system connection information.

Normal Control.

Errors valid.

Operation starts upon IPM bus voltage error detection.

– –

SW3-2 function invalid.

All indoor units stopped.

Fmax=72Hz

–

No action

Valid

–

Invalid

–

––– –

Deletion of refrigerant system connection information.

Deletion of IC/OC error history.

Storage of IC/OC error history.

Refrigerant amount adjustment operation.

Disregard errors.

Operation starts upon IPM bus voltage error detection or detection of outdoor air temperature reading at 5°C.

– –

SW3-2 function valid.

All indoor unit on test run.

Fmax=90Hz

–

Operation starts

Invalid

–

Valid

–

Set to OFF.

Before power is turned on.

After power on. (when switching from OFF to ON)

Becomes invalid 2 hours after compressor start.

After power on. (when switching from OFF to ON)

–

––– –

–

––– –

After power on. (when switching from OFF to ON)

After power on and when SW3-1 is ON.

After power on. (when switching from OFF to ON)

– After power on and when compressor is stopped. (When switching from OFF to ON)

–

–––

–

–––

After power on. (when switching from OFF to ON) When SW4-1 is ON.

–

––– – ––– – ––– –

––– –

OFF ON

––– –

–

––– –

Before power on.

Note :

Factory setting: SWU1-2 = 00, SW4-9 = on, all the others are set to OFF.

The value changes as the following by the switching of ON and OFF switch.

±0% +3% +6% +9% +12% –6% –3% ±0%

4 5 6 7 8 9

. Control

Dip Switch Functions and Factory Settings

[1] Outdoor Unit

< PUD-P250YMF-C >

(1) Main Board

Page 58

- 57 -

(2) Dip Switch (Control Board)

[2] Indoor Unit

< PFD-P250,500VM-A >

(1) Dip Switch (Control Board)

· Above 20A immediately

before starting

· Below 10A five seconds

after starting and thereafter

· Above 20A immediately

before starting

(Below 10A five seconds after start

up will not be detected as error)

Switch Function

Function according to switch

OFF

Switch setting timing

SW1

IDC sensor error-detection mode selection

Serial (IPM) communication

Anytime power on

With communication Without communication

–– – –

Note) All of the above switches are set to off when shipped form the factory.

Notes 1) Settings in the shaded areas indicate factory settings

Setting timing for DIPSW SW 1, 2, 3, 4 is during unit stoppage (remote OFF). It is not necessary to reset the settings by power-off.

Switch

Function

Function According to Switch Operation

OFF ON

Switch Set Timing

OFF ON

Notes

SW1

SW3

–

Remote display selection

–

LEV targets Tc (high temperature) at heating

–

Fan output display

–

––

–

––

–

Thermo ON

–

––

Disabled

Enabled

During unit stoppage

(Remote controller

OFF)

Unit Type P250

Capacity (model type) Code

SW2 sets

123456

ON OFF

Notes 1)

There are two control boards inside indoor unit P500 to accommodate two-refrigerant circuit system. The capacity code for one of the control boards is P250-50.

There is one control board inside indoor unit P250 to accommodate one-refrigerant circuit system.

PFD-P250VM-A

PFD-P500VM-A

1234

OFF OFFOFF ON

SW4

Relay Switch

1234

OFF OFFOFF OFF

SW4

Relay Switch

1 SW1,3

2 SW2 3 SW4

Page 59

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(2) Slide Switch (Address Board)

Switch Function Function According to Switch

Switch-Set

Timing

SWA 1 ~ 3

Forced Thermo OFF

(used by indoor units using

multiple refrigerants)

SWC 1 ~ 2

Suction/Discharge

Temperature Switch

Anytime after

power on

Anytime after

power on

Factory Setting : Discharge Temp. Control

Option : Suction Temp. Control

✻ When choosing between suction and discharge temperature controls, make sure that the settings for the two address boards are identical.

Option Factory Setting

3 2 1

Thermo. ON/OFF

Forced Thermo-OFF

Normal Control

Controlling the Outdoor Unit

< PUD-P250YMF-C >

< General Information on Control >

Each of the two outdoor units in a 2-refrigerant circuit that are connected to the indoor units performs the following control functions independently:

[1] Initial Control

· When turning on the power, the initial processing of the microcomputer is given top priority.

· Control processing of the operation signals is suspended until the initial processing is completed.

(Initial processing involves data processing in the microcomputer and initial setting of each of the LEV opening. This process will take up to 1 minute.)

[2] Control at startup

· When DipSW2-7 are on (Factory setting is OFF), the outdoor temperature is below 5˚C, and the unit is started within 2 hours of power on, the unit will not start for up to 35 minutes.

· For 3 minutes after start up, the upper limit of the frequency is 60 Hz.

[3] Bypass control

Each of the solenoid bypass valves on high-pressure and low-pressure sides (SV1, SV2), performs the following functions:

(1) Bypass Solenoid Valves (SV1, SV2) (Both SV1 and SV2 are open when set to ON)

At compressor startup

SV2SV1

4 minutes ON4 minutes ON

In cooling mode and while the compressor is stopped

OFFAlways ON

Operation condition

ONON OFFOFF

When operation stops

OFF3 minutes ON

During oil recovery

When high pressure (HPS) rises

When discharge temperature rises (3 or more minutes after startup)

When low pressure (LPS) drops

Always off during oil recovery after continuous operation at low frequencies.

During operation with the compressor running at the frequency level of 20Hz When low-pressure drops (3 or more minutes after startup)

When high pressure rises while the unit is operating with the compressor running at the frequency of 20Hz (3 or more minutes after startup)

When low pressure (LPS) goes below

0.098MPa

When low pressure (LPS) exceeds

0.196MPa

When high pressure exceeds 2.70MPa

30 seconds have past and the high pressure is below 2.35MPa

ON when high pressure exceeds 2.5MPa

30 seconds have past and high pressure is below 2.25MPa

When high pressure (HPS) exceeds the pressure limit

When high pressure (HPS) goes below

1.96MPa

When discharge temperature exceeds 130

˚C

When discharge goes below 115˚C

within 20 minutes of startup:LPS<0.049MPa 20 or more minutes from startup:LPS<0.098MPa

within 20 minutes of startup:LPS<0.147MPa 20 or more minutes from startup:LPS<0.196MPa

After thermostat resumes operation or after a 20-second restart

2 minutes ON2 minutes ON

–

––

Page 60

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[4] Frequency Control

¡Depending on the capacity required, frequency is controlled to approximate evaporation temperature (Te) to

the target evaporation temperature (Tem) during cooling operation.

¡Depending on the capacity required, the target evaporation temperature (Tem) changes as the following:

· When lacking in capacity ··························· Tem is lowered Minimum and maximum Tem Value

· When the capacity exceeds the needs ······ Tem is raised -10˚C Tem < 25˚C

¡The frequency changes are shown below:

Start

Thermostat

Stop

Compressor

Bypass solenoid

valve (SV1)

30 seconds2 minutes 2 minutes

Thermostat

OFF

(1) Discharge Temperature Control

· When discharge temperature of the compressor (TH1) exceeds the upper limit during operation, the frequency is reduced by 5Hz.

· Control is performed 20 seconds after compressor start, then every 20 seconds thereafter.

· Operating temperature is 124˚C.

(2) Periodical Frequency Control

Frequency controls other than the ones performed in respond to the status change or for protection are called periodical frequency control. They are performed as the following:

1 Periodical control cycle

Periodical frequency control is started at the following time. a) 20 seconds after the start of compressor b) 1 minute after frequency control prompted by discharge temperature or pressure limit

2 Amount of Frequency Change

The amount of frequency change is controlled to approximate the target value (Tem) depending on the evaporation temperature (Te).

3 Back up of frequency control by the bypass valves

When the compressor is running at 20Hz, the frequency is backed up by turning bypass valve (SV2) on.

When 3 minutes have past after the compressor started operation at 20Hz, the valve is on when low pressure (LPS) is below 0.098MPa and off when it is above 0.196MPa.

30~72Hz

2 Hz/sec.

Frequency change Speed

0.196MPa0.098MPa

OFF

Page 61

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[5] Oil-Return Control

· Oil-return LEV (SLEV) is determined by the operating capacity of the compressor and outside temperature.

· During compressor stoppage and for 10 minutes after startup, the opening of SLEV is 75.

· When the compressor is stopped, the opening of SLEV is 0.

[6] Outdoor Unit Fan

(1) Control Method

· Depending on the capacity required, outdoor unit fan is controlled by phase control, and corrections are made using compression temperature (Tc) to keep evaporation temperature (Te) constant.

(2) Control

· Outdoor unit fan stops when compressor is stopped. (Except in the presence of input from snow sensor)

· Operates at full-speed for 5 seconds of startup.

[7] Subcool Coil Control (Linear Expansion Valve (LEV1))

· Controlled every 20 seconds to keep the amount of superheat constant, using bypass outlet/inlet temperatures of the subcool coil (TH2, TH8).

· The degree of opening is controlled, depending on the inlet/outlet temperatures of the subcool coil (TH5, TH7), high pressure (HPS), discharge temperature (TH1). When the compressor is stopped, the valve is in the closed position (0).

· During TH8 error, the valve will be fixed at a certain degree of opening.

[8] Circulating composition sensor (CS circuit)

· As shown in the drawing below; the CS circuit has the structure to bypass part of the gas discharged from the compressor through the capillary tube to the suction side of the compressor, exchange heat before and after the capillary tube,and produce two phase (gaseous and liquid) refrigerant at the capillary tube outlet. The dryness fraction of refrigerant at the capillary tube outlet is estimated from the temperature of low pressure two phase (gaseous and liquid) refrigerant at the capillary outlet (TH2) and the pressure (LPS) to calculate the composition of refrigerant circulating the refrigeration cycle (

αOC). In this series the high-pressure

liquid refrigerant temperature is calculated based on the high pressure and ambient air temperature values. It is found by utilizing the characteristic that the temperature of two phase (gaseous and liquid) R407C under a specified pressure changes according to the composition and dryness fraction (gas-liquid ratio in weight).

· The condensing temperature (Tc) and the evaporating temperature (Te) are calculated from

αOC, high pres-

sure (HPS), and low pressure (LPS).

· The compressor frequency, the outdoor fan, and others are controlled according to the codensing temperature (Tc) and the evaporating temperature (Te).

· CS circuit configuration (Outline drawing)

Four-way valve

Compressor

Accumulator

CS circuit

TH2

LPS

Heat e

(HPs)

xchanger

Outdoor heat exchanger

Indoor heat

exchanger

Flow control

valve

Page 62

- 61 -

[9] Emergency Operation Mode

Emergency Operation is an operation that is run at 50 to 70 percent of the system's maximum capacity when experiencing problems, depending on the type of problems listed below. It is automatically run after the following abnormalities have been detected.

(1) Starting Emergency Operation

When the following problems are detected, the system runs an emergency operation, displaying error codes.

¡ During this operation, near normal operation is run, ignoring the following abnormal operation data. Some

of the actuators will run at a fix state during this operation.

Chart: Types of errors in which emergency operation can be run

(2) Stopping the Emergency Operation Mode

Emergency operation mode is stopped in the following situations:

When abnormal mode is reset

✻How to reset abnormal mode

· When stopping operation with MA remote controller or pushing the reset button

· When stopping indoor unit or pushing the reset button

When detecting another abnormality during an emergency operation

✻

i.e. Detecting problems with TH5 while running an emergency operation after detecting problems with TH21.

(3) Miscellaneous

When encountering problems other than the ones listed above, the system, except for the fan (unless problems are found with the fan-in which case the fan will also stop), will stop.

When problems are found in only one of the two units of a 2-refrigerant circuit, only the unit with the problems will run an emergency operation or stop its operation, and the other unit will keep running its operation.

Emergency operation is intended only as a first aid until the unit is serviced. Have the unit serviced without delay to restore a normal operation.

[10] Capacity Control Between Outdoor Units (For P500 Type Only)

Capacity control between outdoor units consists of the following:

Starting up only one of the outdoor units (the one with lower address number) at start-up when the load is light.

2 Stopping one of the outdoor units (the one with higher address number) when the load drops.

They are performed automatically under the following conditions:

(1) Starting Conditions

1 When it is determined that the load is less than 50%, using suction temperature as a reference. 2

Operation frequencies of both indoor and outdoor units remain near the minimum level three minutes after start-up.

(2) Stopping Conditions

When operation frequency of the running unit rises up near the maximum capacity. When it is determined that the load is over 50%, using suction temperature as a reference. When compressor stops while running only one unit.

High Pressure Sensor Error Error Detection by the Sensor 5201

Error codesTypes of Errors

TH2 TH5 TH7 TH8 TH10

Thermistor Error (Except for TH1,TH6,THHS)

Open/Short Detection 5102

5105 5107 5108 5112

Page 63

- 62 -

2 Stop Mode

Cooling Mode

· Thermistor

· Float Switch

· HA In

· Rotary Switch

· Relay

· LEV

· Fan Motor

· Bypass valve

· LEV

· LED

· Crankcase heater

· Thermistor

· Pressure sensor

· Protection input

· Rotary switch

Indoor unit

Indoor/Outdoor unit transmission line

Address switch SW

Compressor operation signal

Error signal

· 52C

· Cooling fan

COMP

IPM

(Intelligent power module)

DC530

~580V

(Diode stack)

Noise

filter

Gate amp. board

Inverter board

Main control board

TB7 TB3

3N380/400/415V

Centralized control unit transmission line

2 3

Outdoor unit

2 Stop Mode (corresponding indoor unit is in Fan mode or stopped)

Cooling Mode (corresponding indoor unit is in cooling mode)

[11] Control-Block Diagram

[12] Operation Modes

(1) Indoor Unit Operation Modes

(2) Outdoor Unit Operation Modes

Page 64

- 63 -

Controlling the Indoor Unit

< Indoor unit control >

Inside the indoor units 16 and 20 HP are two control boards to accommodate two-refrigerant circuits, and there is one control board inside indoor unit 10HP to accommodate one-refrigerant circuits. Each refrigerant circuit is controlled independently. See the following for various functions they perform.

[1] Thermostat Functions

(1) Functions of Thermostat and Selection of Function

· There are two control methods. One is to use suction temperature; the other is to use discharge temperature.

· The switches on the address board inside indoor unit is used to switch between the above options.

· Factory setting: Discharge Temperature Control.

· When changing the setting, set the switches on both address boards inside the control to OPTION to

use suction temperature control. Set the switches to STANDARD to use discharge temperature control.

· Make sure that the settings on the two address boards inside 16 and 20P units match.

✻ Not applicable to 10HP

(2) Thermostat Reading

1 Discharge Temperature Control (SWC is set to Standard)

(a) Thermo ON Condition

• Three minutes have past since thermo OFF AND

• TH24 - Target Temperature >1˚C AND

• TH21 is higher than when thermo is OFF.

TH24: Discharge thermistor TH21: Suction thermistor

(b) Thermo OFF Condition

< When outdoor unit Dipsw3-7 are ON >

· 30 minutes have past since thermo ON AND

· TH24- Target Temperature < -1˚C has been detected for 10 minutes OR TH24 - Target Temperature < 15˚C was detected

< When Outdoor unit Dipsw 3-7 are OFF>

· Two minutes have past since thermo ON

· TH24 - Target Temperature < -1˚C has been detected for 5 minute.

· When operating with the compressor running at its minimum capacity.

2 Suction Temperature Control (SWC is set to Option.)

(a) Thermo ON Condition

• Three minutes have past since thermo OFF AND

• TH21 - Target Temperature > 1˚C

(b) Thermo OFF Condition

< When outdoor unit Dipsw 3-7 are ON >

• Thirty minutes have past since thermo ON AND

• TH21 - Target Temperature < -1˚C has been detected for 10 minutes OR TH21 - Target Temperature < -5˚C was detected.

< When outdoor unit Dipsw 3-7 are OFF >

• Two minutes have past since thermo ON AND

• TH21 - Target Temperature < -1˚C has been detected for 5 minute.

• When operating with the compressor running at its minimum capacity.

Address board

SWC

Option: Suction temperature control

Standard: Discharge temperature control

Control box

Address board

Control board

Remote controller

Page 65

- 64 -

[2] Actuator Control

(1) LEV Control

· Depending on the condensation pressure, LEV control is set at a certain level at start-up.

· After the start-up, the degree of LEV opening is adjusted every minute to keep within a certain range

the superheat detected by Thermistors TH22 (liquid) and TH23 (gas) in the indoor unit.

· Depending on the operating condition of the outdoor unit, a controlling method other than the one described above may be used.

· When suction or discharge temperature nears the target temperature, superheat control value rises and LEV opening narrows.

· LEV’s full range of opening-closure is 41 pulses.

(2) Fan Control

Whether the thermostat is on or off, the fan stays on except during operation stoppage. Exception: Fan stops when problem with the fan is detected (Error Code 4109). ✻ Fan problems may be experienced in the following situations: Surge breaker trip (51F) or malfunctions

of sub relays Z1, Z2, or Z3.

(3) Float Switch Control

The unit will stop when the contact point (B contact) loses its contact for more than one minute (i.e. loos-

ened float parts, disconnected wire, unfastened connector etc.)

(4) Indicator Lamp

Indicator lamps on the front side of the unit indicate the operation status of the indoor unit.

Power Supply Lamp (White): ON upon power on. OFF upon power off. Operation Lamp (Green) : ON during operation. OFF during stoppage. Error Lamp (Red) : Comes on upon detection of abnormalities in each refrigerant circuit.

Indicator OFF during normal operation and after a reset.

Maintenance Lamp (Yellow) : ON when maintenance switch of the indoor unit is on.

OFF upon normal shutdown.

[3] Temperature Setting Range

Both suction and discharge temperatures can be set between 14 and 30˚C from the centralized controller. ✻ Depending on the operating conditions, target temperature and actual discharge/suction temperatures may

not match. For example, even if the target discharge temperature is set at 15˚C, if the load exceeds the capability of the unit, the actual temperature will not reach 15˚C.

[4] Emergency Operation Mode

Emergency operation is an operation that is run at 50 to 70 percent of the system's normal capacity when experiencing problems, depending on the type of problems listed below. It is automatically run after the following abnormalities have been detected.

(1) Starting an Emergency Operation

When the following problems are detected, the system runs an emergency operation, displaying error codes.

During this operation, near normal operation is run, ignoring the following abnormal operation data. Some of the actuator will run at a fixed state during this time.

(2) Stopping the Emergency Operation

Emergency operation mode is stopped in the following situations:

When abnormal mode is reset ✻ How to reset an abnormal mode

· When stopping operation with the MA remote controller or pushing the reset button

· When stopping indoor unit or pushing the reset button

When detecting another abnormality during an emergency operation

✻

i.e. Detecting problems with TH5 while running an emergency operation after detecting problems with TH21.

Error codesTypes of Errors TH21 TH22 TH23 TH24

Thermistor Error Open/Short Detection 5101

5102 5103 5104

Chart: Types of errors in which emergency operation can be run

Page 66

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(3) Miscellaneous

When encountering problems other than the ones listed above, the system, except for the fan (unless problems are found with the fan-in which case the fan will also stop), will stop.

When problems are found in only one of the two units of a 2-refrigerant circuit, only the unit with problems will run an emergency operation or stop its operation, while the other unit will keep running its normal operation.

Emergency operation is intended only as a first aid until the unit is serviced. Have the unit serviced without delay to restore a normal operation.

[5] Three-minute restart-suspension mode

The unit will be in a three-minute restart-suspension mode (same operation as Thermo OFF) in any of the following situations.

· When the demand for outdoor unit changes from Thermo ON to Thermo OFF.

· When operation mode changes from normal to emergency mode.

· When anti-freeze mode is completed.

✻ Outdoor unit also has a three-minute restart-suspension mode, and it works independently of the

indoor unit.

[6] Anti-Freeze Control

(1) Starting Conditions

This operation will start when all of the following conditions are met:

· Thermo ON status has been detected for 16 minutes.

· TH22 (liquid pipe temp. Thermistor) < 1˚C has been detected for 20 minutes.

(2) Control Operation

The unit will be in the same condition as Thermo OFF condition for six minutes. When the following conditions are met, the unit will be in a 20-second restart-suspension mode.

(3) Stopping Conditions

When either of the following conditions is met:

· HT22 10˚C

· Six minutes have elapsed since the beginning of this operation.

[7] Operation during Electrical Power Failure

After the controller in this air conditioning unit receives signals indicating power failure or an instantaneous drop in voltage, unless the unit receives a command not to restart, it will resume its operation after power supply is restored. Depending on the duration of power outage, the following operations will be run.

Note 1: When indoor unit is in the maintenance mode (SW8 local mode), it will not resume operation even

after the power has been restored.

Note 2: After the unit resumes its operation, MA remote controller will display 'HO' for fifteen seconds, during

which time the remote controller will not respond. To turn off the unit during this time, turn off the power with an electric leak breaker.

Duration of Power Outage Unit Operation

Shorter than 6msec Both indoor and outdoor units will stay on.

Longer than 6msec and Shorter than 50msec (Note1, Note2)

It is recognized by the unit as aninstantaneous power outage

Indoor Unit: The fan stays on. Outdoor Unit: Compressor stops, then resumes its operation 3 minutes later.

✻ Note on the outdoor unit: When the power supply is cut off for longer than 6 msec, compressor will stop.

Longer than 50msec (Note1, Note2)

It is recognized by the unit as power outage. Air-conditioning unit will stop (incl. fan and compressor). It will resume operation after the power has been restored.

Page 67

- 66 -

Note 1: Indoor LEV fully open = 41 pulse. Note 2: Error mode can either be on the indoor unit error mode or outdoor unit error mode. In either case,

connected indoor or outdoor unit will stop. (During emergency operation mode, the unit will keep its operation.)

Operation Flow Chart

[1] Mode Selection Flow Chart

(1) Indoor Unit (Cooling Mode)

ations

Start

Remote controller off

FAN stops

Breaker on

Error mode

Note 2

Note 1

Operation

SW on

1. Self-holding of protection function released

2. Indoor LEV fully open

Normal oper Abnormal operations At stoppage

Error display

Error stop

Self-holding of

protection function

Cooling mode

From indoor unit

Cooling display

Operation mode

Signal to start operation sent to outdoor/heat-source units

Cooling operation

(Refer to 2-(1))

Error message

sent to outdoor unit

Indoor LEV

fully open

YES

Page 68

- 67 -

(2) Outdoor Unit (Cooling Mode)

ations

Start

Breaker trip

Operation

mode

Error mode

Operation

mode

52C ON

Cooling operation

Refer to 2-(1) and 2-(3)

Go to indoor unit operation mode command 1

Error stop

Outdoor unit error display

on the LED

Self-holding of protection

function

Error message sent to

indoor units

Note 1

Cooling

Note 2

Note 3

Operation command

Normal oper Abnormal operations At stoppage

From indoor unit

YES

System

startup completed

(Approx. 1 minute)

1. 52C OFF

2. Inverter output 0Hz

3. Fan stop

4. All solenoid valves OFF

1. Self-holding of protection function released

2. SLEV, LEV1 fully open (outdoor unit)

Note 1: Searches for indoor unit remote control address information and group information for one minute

after power on.

Note 2: There could be problems with either indoor units or outdoor units. In either case, the corresponding

outdoor units or indoor units will make an error stop. (While running an emergency operation mode, these units will remain in operation.)

Note 3: The operation mode is determined by the indoor unit.

Page 69

- 68 -

[2] Operation in each Mode

(1) Cooling Operation

YES

1. Inverter output 0Hz

2. Indoor unit LEV, Subcool coil bypass LEV fully closed

3. Solenoid valve OFF

4. Outdoor unit fan stop

1. Inverter frequency control

2. Indoor unit LEV control

3. Solenoid valve control

4. Outdoor unit fan control

Cooling operation

4-way valve OFF

Indoor unit fan

operations

Test run start

Thermostat ON

Normal operations Test run Stop

3-minute

restart

prevention

Page 70

- 69 -

During cooling operations, the demand for refrigerant tends to increase in proportion to an increase in the number of operating indoor units (refrigerant in the accumulator decreases), though the change is small.

Having refrigerant in the accumulator, there is little change in discharge temperature when increasing or decreasing refrigerant amount.

Compressor shell temperature is 20 to 70 k higher than low pressure saturation temperature when refrigerant amount is adequate. When the difference between pressure shell temperature and low pressure saturation temperature is smaller than 10k, overfilling of refrigerant is suspected.

Tendency of discharge temperature change

In cooling operation, discharge temperature is more likely to rise when operation load is high (outdoor temperature is high etc.) than when indoor target temperature is set low.

The lower the operation frequency, the more likely discharge temperature will rise because of a drop in compressor efficiency

Comparison including control system.

1 The unit stops, displaying 1500 (refrigerant overfill) on remote controller. Refrigerant Overfill

Insufficient

Refrigerant

2 Operating frequency does not reach its optimal level, resulting in insufficient power.

3 The unit stops, displaying 1102 (discharge temp. abnormality) on the controller.

4 Intermittent Fault Check Code 1243 is recorded in the error history.

1 Discharge temperature is high (over 125˚C)

Condition Evaluation

Tend towards under fill

Tend towards overfill

2 Low pressure is extremely low

3 Inlet super heat is high (normal range = under 20K)

6 Discharge superheat is low (normal range = 20K and above)

Shell bottom temperature is high (The difference between low pressure saturation temperature and shell bottom temperature is 70K or greater)

Shell temperature is low (The difference between shell temperature and low-pressure saturation temperature is 10K or less).

. Refrigerant Amount Adjustment

Operating Characteristics and Refrigerant Amount

It is important to understand the relationship between refrigerant amount and operation characteristics. Use the following information when adjusting refrigerant amount.

[1] Operating Characteristics/Refrigerant Amount

Checking and Adjusting Refrigerant Amount

[1] Symptoms

The symptoms shown in the table below are possible signs of excess or lack of refrigerant. Be sure to adjust refrigerant amount in the Refrigerant-Amount Adjustment Mode after determining the appropriate amount of refrigerant to be added or drained by checking the operation status and performing self-diagnosis using LED.

[2] Refrigerant Volume

(1) Items to check during operation

Operate all the indoor units in cooling mode, and check discharge temperature, sub-cooling, low pressure, inlet temperature, and shell-bottom temperature.

Page 71

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(2) Checking refrigerant Volume Using LED

Set Self-Diagnosis Switch (SW1) as shown and check the history of operation regarding refrigerant.

[3] Amount of Refrigerant to Be Added

At the time of shipment, outdoor unit is charged with the amount of refrigerant shown in the following table. Additional refrigerant necessary for extension pipes is not included. Add refrigerant on site as necessary.

[ Formula ]

The amount of refrigerant to be added is calculated using the diameter of extension pipes and their length in meters.

1: Length of liquid pipe with a diameter of 12.7 in meters

✻ Round up the figure in the 1/100th digit (i.e. 18.54kg /18.6kg)

Pipes shown above are liquid pipes. ø12.7 : 120m

✻ Fill each refrigerant circuit (in a 2-refrigerant circuit system) with the above amount.

Outdoor Unit Model Name PUD-P250YMF-C

Amount of refrigerant included 8.5kg

Amount of additional refrigerant (kg) = (0.12 ✕ L1) + 2.0

ø12.7(120m)

Outdoor Unit

Indoor Unit

From the formula above

Amount of refrigerant to be added

Amount of refrigerant to be added= 16.4kg

=(0.12

✕ 120) + 2 = 16.4kg

Set SW1 as shown on the right

When LED 8 lights up: It indicates that the unit is close to being stopped due to overfilling of

refrigerant.

1234 5678910

Caution

Charge the system with liquid refrigerant.

If gas refrigerant is used, the composition of refrigerant in the cylinder will change and will lead to power loss.

Page 72

- 71 -

Turn on function switch SW2-4 on the main control board of outdoor unit to go into Refrigerant-Adjustment Operation Mode.

When the SW1 of the main control board of outdoor unit is set as follows, circulation composition alpha OC will be displayed on the LED.

Refrigerant-Adjustment Operation Mode

Procedures described in this unit is meant to be used on a first-aid basis, as it is difficult to accurately adjust refrigerant volume. Using the flow chart in the following section, determine if the unit has an adequate amount of refrigerant.

[1] Procedures (only for air-cooled outdoor units)

Follow the procedures below when refrigerant needs to be added or drained.

Note 1: Even when it is indicated at the initial stage of Refrigerant-Amount Adjustment Mode operation

that the unit contains an adequate amount of refrigerant, it may later turn out that the unit either has an excessive or insufficient amount of refrigerant. (When operation of refrigerant circuit has stabilized).

1When refrigerant amount is truly adequate

TH5 through TH7 of the outdoor unit are under 5K, and SH of the indoor unit is between 6 and 13K.

2Even if currently within adequate range, the possibility exists that, with a passage of time, the

amount of refrigerant will be found to be inadequate.

In the case when outdoor unit TH5, 6, and 7 are above 5K and indoor unit SH is between 6 and 13K.

Note 2: When high pressure has not reached 1.37MPa or above, it may be difficult to accurately assess

the amount of refrigerant in the system.

Note 3: Based on the flow chart that follows, and using TH1, TH5, TH7, and Tc, adjust refrigerant amount.

TH1, TH5, TH7, and Tc can be displayed on the Self-Diagnosis Switch on the main control of the outdoor unit.

Operation

During cooling operation, LEV1 of outdoor unit opens more than usual.

1234 5678910

TH1 self-diagnosis switch

1234 5678910

TH5 self-diagnosis switch

1234 5678910

TH7 self-diagnosis switch

1234 5678910

Tc self-diagnosis switch

Remedies

When adjusting refrigerant amount in cooling mode and when Note 2 above applies, wait until TH5, 6, and 7 on the outdoor reach 5K and SH6,7,8, and 9 of the indoor unit to fall between 6 and 9K; then, determine the correct amount of refrigerant.

To monitor the SH of the indoor unit, turn on the Self-Diagnosis Switch of the outdoor unit, and monitor it with the LED.

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Start

Run indoor units in test cooling mode

YES

TH1 115˚C?

7 Tc-TH5 12K?

Tc-TH7 17K? Tc-TH5 7K?

TH1 110

˚C

Gradually add refrigerant from low-pressure service port

Note

Run the unit for 5 minutes after adjusting refrigerant amount.

Gradually add refrigerant from low-pressure service port

Gradually drain refrigerant from low-pressure service port

Run the unit for 5 minutes after adjusting refrigerant amount.

Run the unit for 5minutes after adjusting refrigerant amount and check Tc-TH5.

At least 2 hours have past since

the unit was turned on OR

The unit has continuously been running

for 30 minutes AND frequency

has stabilized.

At least 2 hours have past since

the unit was turned on OR

The unit has continuously been running

for 30 minutes AND frequency

has stabilized.

6 minutes after start-up?

Finish

< Air-Cooling Outdoor Unit >

Caution

Do not release drained refrigerant into the air.

Caution

Use liquid refrigerant.

If gas refrigerant is used, the composition of the refrigerant in the cylinder will change and lead to a loss of power.

Note) Operate using DIPSW 3-1 and 3-2

Page 74

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Check Code Check Content

0403 Serial transmission abnormality

0900 Trial operation

1102 Discharge temperature abnormality

1111 Low pressure saturation temperature sensor abnormality (TH2)

1112 Low pressure saturation Liquid level sensing temperature sensor abnormality (TH4)

1113 temperature abnormality Liquid level sensing temperature sensor abnormality (TH3)

1301 Low pressure abnormality

1302 High pressure abnormality

1500 Overcharged refrigerant abnormality

1501 Low refrigerant abnormality

1505 Suction pressure abnormality

2500 Leakage (water) abnormality

2502 Drain pump abnormality

2503 Drain sensor abnormality

4103 Reverse phase abnormality

4109 Fan motor abnormality

4115 Power supply sync signal abnormality

4200 VDC sensor/circuit abnormality

4220 Bus voltage abnormality

4230 Radiator panel overheat protection

4240 Over loard protection

4250 IPM Alarm output / Bus voltage abnormality / Over Current Protection

4260 Cooling fan abnormality

Air inlet (TH21:IC)

5101

Discharge (TH1:OC)

Liquid pipe (TH22:IC)

5102

Low pressure saturation (TH2:OC)

5103

Gas pipe (TH23:IC)

Thermal sensor

5105

abnormality

Liquid pipe (TH5)

5106 Ambient temperature (TH6)

5107 SC coil outlet (TH7)

5108 SC coil bypass outlet (TH8)

5109 CS circuit (TH9)

5110 Radiator panel (THHS)

5112 Compressor shell temperature (TH10)

5201 Pressure sensor abnormality

5301

[6]

[13]

IAC sensor miss-wiring abnormality

IAC sensor/circuit abnormality

6600 Multiple address abnormality

6602 Transmission processor hardware abnormality

6603

[ ] : Error detail No.

Transmission circuit bus-busy abnormality 6603 Transmission Bus-Busy error 6606 Problem communication with the transmission processor 6607 No-acknowledgement error 6608 No-response error

. Troubleshooting

List of Check Code

Page 75

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Trouble Delay Cope Trouble Delay Content

1202 (1102)

Preliminary discharge temperature abnormality or preliminary discharge thermal sensor abnormality (TH1) 1205 Preliminary liquid pipe temperature sensor abnormality (TH5)

1211 (1111)

Preliminary low pressure saturation abnormality or preliminary low pressure saturation sensor abnormality (TH2)

1214 Preliminary THHS sensor/circuit abnormality

1216 Preliminary sub-cool coil outlet thermal sensor abnormality (TH7)

1217 Preliminary sub-cool coil bypass outlet thermal sensor abnormality (TH8)

1219 Preliminary sub-cool coil bypass inlet thermal sensor abnormality (TH9)

1243 (1501) Preliminary compressor shell thermal sensor abnormality (TH10)

1221 Preliminary ambient temperature thermal sensor abnormality (TH6)

1402 (1302) Preliminary high pressure abnormality or preliminary pressure sensor abnormality

1601

Preliminary 1600 (1500)

Preliminary lacked refrigerant abnormality

overcharged refrigerant abnormality

1605 (1505) Preliminary suction pressure abnormality

1607 CS circuit b

1608 Control valve abnormality

1659 (1559) Oil balance circuit abnormality

lock abnormality

Preliminary serial transmission abnormality

4300 (5301) [6]

[9]

[13]

[1]

[11]

4300 (0403)

IAC sensor/circuit abnormality

IAC sensor miss-wiring abnormality

4320 (4220) Preliminary bus voltage abnormality

4330 (4230) Preliminary heat sink overheating abnormality

4340 (4240) Preliminary overload protection

4350 (4250) IPM Alarm output/Bus voltage abnormality

IAC sensor overcurrent abnormality

4360 (4260)

Please refer to ( ) : Check Code. [ ] : Error detail No.

Preliminary cooling fan abnormality

Intermittent Fault Check Code (outdoor units only)

Check Code Check Content

6831 MA communication reception error (no reception)

6832 MA communication reception error (frequency restoration error)

6833 MA communication transmission error (H/W error)

6834 MA communication reception error (start bit detection error)

7100 Total capacity error

7101 Capacity code error

7102 Connected units exceeds the limit

7105 Address setting error

7106 Characteristics setting error

7109 Connection setting error

7110 Failure to set connection information

[ ] : Error detail No.

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Check code Meaning, detecting method Cause Checking method & Countermeasure

Serial transmission abnormality

0403

If serial transmission cannot be established between the MAIN and INV boards.

1) Wiring is defective.

2) Switches are set wrong on the INV board.

3) A fuse (F01) on the INV board is defective.

4) The circuit board is defective.

Check 1, the connections, 2, contact at the connectors and 3, for broken wires in the following wiring.

CNRS2 - CNRS3 CNAC2 - TB1B

SW1-4 on the INV board should be OFF.

If the fuse is melted, (if the resistance between the both ends of fuse is ∞), replace the fuse.

If none of the items in 1) to 3) is applicable, and if the trouble reappears even after the power is switched on again, replace the circuit board by the following procedure (when replacing the circuit board, be sure to connect all the connectors, ground wires, etc. securely). 1 If serial transmission is restored af-

ter the INV board only is replaced, then the INV board is defective.

2 If serial transmission is not restored,

reinstall the INV board and replace the MAIN board. If serial transmission is restored, the MAIN board is defective.

3 If serial transmission is not restored

by 1 and 2 above, replace both boards.

Discharge temperature abnormality (Outdoor unit)

1102

1. When 140˚C or more discharge temperature is detected during operations (the first time), outdoor unit stops once, mode is changed to restart mode after 3 minutes, then the outdoor unit restarts.

2. When 140˚C or more temp. is detected again (the second time) within 30 minutes after stop of outdoor unit, emergency stop is observed with code No. “1102” displayed.

3. When 140˚C or more temp. is detected 30 or more minutes after stop of outdoor unit, the stop is regarded as the first time and the process shown in 1 is observed.

4. 30 minutes after stop of outdoor unit is intermittent fault check period with LED displayed (1202).

See Refrigerant amount check.

Check operating conditions and operation status of indoor/outdoor units.

Check operation status by actually performing cooling or heating operations.

Cooling : Indoor LEV

Outdoor LEV1

See Trouble check of LEV and sole-

noid valve.

Check address setting of indoor unit connection.

Confirm that ball valve is fully opened.

Check outdoor fan. See Trouble check of outdoor fan.

Check operation status of cooling-only or heating-only.

See Trouble check of solenoid

valve.

Check resistance of thermistor.

Check inlet temperature of sensor with LED monitor.

1) Gas leak, gas shortage.

2) Overload operations.

3) Poor operations of indoor LEV.

4) Poor operations of OC controller LEV

5) Setting error of connection address.

6) Poor operations of ball valve.

7) Outdoor unit fan block, motor trouble, poor operations of fan controller→Heating (Heating-only, Heating-main).

3) ~ 7) : Rise in discharge temp. by low pressure drawing.

8) Gas leak between low and high pressures. 4-way valve trouble, compressor trouble, solenoid valve SV1 trouble.

Poor operations of solenoid valve SV2. Bypass valve SV2 can not control rise in discharge temp.

10)Thermistor trouble.

11)Thermistor input circuit trouble on control circuit board.

Self-Diagnosis and Problem-Solving Using Check Codes

[1] Mechanical

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Check code Meaning, detecting method Cause Checking method & Countermeasure

Low pressure saturation temperature sensor abnormality (TH2)

Liquid level detecting temperature sensor abnormality (TH4)

Liquid level detecting temperature sensor abnormality (TH3)

1111

1112

1113

1. When saturation temperature sensor (TH2) or liquid level detecting temperature sensors (TH3, TH4) detects -40˚C or less (the first time) during operations, outdoor unit stops once, mode is changed to restart mode after 3 minutes, then the outdoor unit restarts.

2. When -40˚C or less temp. is detected again (the second time) within 30 minutes after stop of outdoor unit, error stop is observed with code Nos. “1111,”“1112,” or “1113” dis- played.

3. When -40˚C or less temperature is detected 30 or more minutes after stop of outdoor unit, the stop is regarded as the first time and the process shown in

1. is observed.

4. 30 minutes after stop of outdoor unit is intermittent fault check period with LED displayed.

Note:

1. Low press. saturation tem-

perature trouble is not detected for 3 minutes after compressor start, and finish of defrosting operations, and during defrosting operations.

2. In the case of short/open of

TH2~TH4 sensors before starting of compressor or within 10 minutes after starting of compressor, “1111,” “1112,” or “1113” is displayed too.

See Refrigerant amount check.

Check operating conditions and operation status of outdoor unit.

Check operation status by actually performing cooling-only or heating-only operations.

Cooling-only : indoor LEV

Outdoor LEV1

See Trouble check of LEV and sole-

noid valve.

Check address setting of indoor unit connector.

Confirm that ball valve is fully opened.

Check indoor unit, and take measu-res to troube.

Check outdoor unit, and take measures to trouble.

Check outdoor unit fan. See Trouble check of outdoor unit

fan.

See Trouble check of solenoid valve.

Check resistance of thermistor.

See Trouble check of pressure sen-

sor.

Check inlet temp. and press. of sensor by LED monitor.

1) Gas leak, Gas shortage.

2) Insufficient load operations.

3) Poor operations of indoor LEV.

4) Poor operations of OC controller LEV:

5) Setting error of connection address.

6) Poor operations of ball valve.

7) Short cycle of indoor unit.

8) Clogging of indoor unit filter.

9) Fall in air volume caused by dust on indoor unit fan.

10)Dust on indoor unit heat exchanger.

11)Indoor unit block, Motor trouble.

5)~10) : Fall in low pressure caused by evaporating capacity in cooling-only cooling-principal operation.

12)Short cycle of outdoor unit.

13)Dust on outdoor heat exchanger.

14)Indoor unit fan block, motor trouble, and poor operations of fan controller.

11)~13) : Fall in low press. caused by lowered evaporating capa-city in heating-only heating-principal operation.

15)Poor operations of solenoid valve SV2. Bypass valve (SV2) can not control low pressure drop.

16)Thermistor trouble (TH2~TH10).

17)Pressure sensor abnormality.

18)Control circuit board thermistor abnormality and pressure sensor input circuit abnormality.

19)Poor mounting of thermistor (TH2~TH10).

Low pressure saturation temperature trouble

Page 78

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Check code Meaning, detecting method Cause Checking method & Countermeasure

1301

1302

Low pressure abnoramlity

High pressure abnoramlity 1 (Outdoor unit)

When starting from the stop mode for the first time, (if at the start of bind power transmission, the end of bind power transmission, and in the mode when the thermostat goes OFF immediately after the remote control goes ON, the following compressor start time is included), if the low pressure pressure sensor before starting is at 0.098MPa, stops immediately.

operation

1. When press. sensor detects

2.47MPa

or more

oper

during

ations (the first time), outdoor unit stops once, mode is changed to restart after 3 min

mode

utes, then the

outdoor unit restarts.

2. When

2.94MPa

or more

pressure is detected

again

(the second time) within

30 minutes after stop of outdoor unit,error stop is observed with code No. “1302” displayed.

3. When

2.47MPa

or more

pressure is detected 30 or

more minutes after stop of

outdoor unit, the detection is regarded as the first time and the process shown in 1 is observed.

4. 30 minutes after stop of outdoor unit is intermittent fault check period with LED displayed.

in addition to pressure sensor.

1) Internal pressure is dropping due to a gas leak.

2) The low pressure pressure sensor is defective.

3) Insulation is torn.

4) A pin is missing in the connector, or there is faulty contact.

5) A wire is disconnected.

6) The control board’s low pressure pressure sensor input circuit is defective.

1) Poor operations of indoor LEV.

2) Poor operations of outdoor LEV1

3) Setting error of connection address.

4) Poor operations of ball valve.

5) Short cycle of indoor unit.

6) Clogging of indoor unit filter.

7) Fall in air volume caused by dust on indoor unit fan.

8) Dust on indoor unit heat exchanger.

9) Indoor unit fan block, motor trouble.

4)~9) : Rise in high pressure caused by lowered condensing capacity in heating-only and heating-principal operation.

10)Short cycle of outdoor unit.

11)

Dust on outdoor unit heat exchanger.

12)

Outdoor unit fan block, motor trou-ble,

poor operations of fan controller.

10)~12):Rise in high press. caused by lowered condensing capacity in cooling-only and cooling-pincipal operation.

13)Poor operations of solenoid valves SV1, 2 (Bypass valves (SV1, 2) can not control rise in high pressure).

14)Thermistor trouble (TH2, TH5, TH6).

15)Pressure sensor trouble.

16)Control circuit board thermistor trouble, press. sensor input circuit trouble.

Refer to the item on judging low pressure pressure sensor failure.

Check operations status by actually performing cooling or heating operations.

Cooling : Indoor LEV

Outdoor LEV1

See Trouble check of LEV and sole-

noid valve.

Check address setting of indoor unit connector.

Confirm that ball valve is fully open-ed.

Check indoor unit and take measures to trouble.

Check outdoor unit and take measures to trouble.

Check outdoor unit fan See Trouble check of outdoor unit

fan.

See Trouble check of solenoid valve.

Check resistance of thermistor.

Check Trouble check of pressure

sensor.

Check inlet temperature and press. of sensor with LED monitor.

2.94 MPa

operates

-1.5

High pressure abnoramlity 2 (Outdoor unit)

When press. sensor detects

0.098MPa

or less just before starting of operation, erro stop is observed with code No. “1302” displayed.

1) Fall in internal press. caused by gas leak.

2) Press. sensor trouble.

3) Film breakage.

4) Coming off of pin in connector portion, poor contact.

5) Broken wire.

6) Press. sensor input circuit trouble on control circuit board.

See Trouble check of pressure sen-

sor.

Error stop is observed immediately when press. switch

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1501

Insufficient refrigerant abnormality

1. When the unit condition is as follows, the compressor is stopped (1st detection) and after 3 minutes, the compressor is restarted automatically.

1 F<60Hz and TH10>85°C

continuously for 60 minutes.

2 F<60Hz and TH10>95°C

continuously for 15 minutes.

3 F

60Hz and TH10>100°C

continuously for 60 minutes.

4 F 60Hz and TH10>110°C

continuously for 15 minutes.

If the temperature rises again as above within 2 hours after the outdoor unit is stopped (2nd detection), an error stop is performed, and the check code 1501 is displayed.

If the temperature rises again as above within 2 hours after the outdoor unit is stopped, it becomes the first detection again, and operation is the same as in 1 above.

The 2 hour period after the outdoor unit stops is the abnormal delay period, and LED display is carried out during the abnormal stop delay.

Lacked refrigerant abnormality

1) Gas leakage, insufficient gas.

2) Overload operation.

3) Indoor unit LEV operation is faulty.

4) Outdoor unit LEV1 operation is faulty.

5) Outdoor unit SLEV operation is faulty.

6) Ball valve operation is faulty.

7) The thermistor is faulty.

8) The control board’s thermistor input circuit is faulty.

Refer to the item on judging the refrigerant volume.

Check the indoor and outdoor unit operating conditions. Actually run the equipment in cooling or heating mode and check the operating condition.

Cooling : Indoor LEV

Outdoor LEV1 SLEV

Refer to the item concerning judging LEV failure.

Check with the ball valve fully open.

Check the thermistor’s resistance.

Check the sensor’s temperature reading by the LED monitor.

Check code Meaning, detecting method Cause Checking method

1500

In case of SW2-6 ON, the detection for the second time is followed by the first time.

Overcharged refrigerant abnormality

1) Excessive refrigerant charge.

2) Thermistor trouble (TH1, TH10).

3) Pressure sensor trouble (63HS).

4) Control circuit board trouble.

Check refrigerant amount.

Check resistance of thermistor.

See trouble shooting of pressure sensor.

Check temperature and pressure sensor with LED monitor.

When discharge superheart 10 deg and oil temperature superheat < 15 deg is keeping for 10 minutes or discharge superheat 20 deg and oil temperature superheat < 15 deg for 15 minutes again (second time), the unit stops and error code 1500 is displayed.

When discharge superheart 10 deg and oil temperature superheat < 15 deg is keeping for 10 minutes or discharge superheat 20 deg and oil temperature superheat < 15 deg for 15 minutes, outdoor unit stops once, and after 3 minutes, the unit restarts. For 60 minutes after unit stopped is intermittent fault check period.

Page 80

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Check code Meaning, detecting method Cause Checking method & Countermeasure

1505 Suction

pressure abnormality

1. Judging that the state when the suction pressure reaches 0MPa during compressor operation, the back-up control by gas bypassing will be conducted.

• Operation while neglecting to open ball valve. Especially for the ball valve at low pressure side. At cooling : Gas side ball valve At heating : Liquid side ball valve

• When plural systems are existing, the low pressure abruptly drop at indoor stopping by the erroneous wiring of transmission line (different connection of transmission line and refrigerant piping).

• Temporary vacuum condition due to refrigerant distribution unbalance (insufficient refrigerant of low pressure line) immediately after charging refrigerant.

Once vacuum operation protection is commenced, do not attempt to restart until taking the measures below. <Checking method>

• Check ball valve for neglecting to open.

• Check extended piping for clogging when ball valve is opened.

• Check transmission line for erroneous wiring. (Confirm the correct wiring and piping connection between indoor and outdoor units by operating indoor unit one by one.)

• After checking with the above method, make error reset by power source reset.

• Then operate for 10~15-minutes under the operation mode reverse to that when the vacuum operation protection occurred (Heating if error occurred in cooling, while cooling if it occurred in heating), and then enter into the ordinary operation state.

2500

2502

2503

Leakage (water) abnormality

Drain pump abnormality

Drain sensor abnormality

Operation of float switch

When drain sensor detects flooding during drain pump OFF.

When indirect heater of drain sensor is turned on, rise in temperature is 20 deg. or less (in water) for 40 seconds, compared with the temperature detected before turning on the indirect heater.

Short/open is detected during drain pump operations. (Not detected when drain pump is not operating.) Short : 90˚C or more detected Open : -40˚C or less detected

When float switch operates (point of contact : OFF), error stop is observed with code No. “2503” displayed.

1) Water leak due to humidifier or the like in trouble.

1) Drain sensor sinks in water because drain water level rises due to drain water lifting-up mechanism trouble.

2) Broken wire of indirect heater of drain sensor.

3) Detecting circuit (circuit board) trouble.

1) Thermistor trouble.

2) Poor contact of connector. (insufficient insertion)

3) Full-broken of half-broken thermistor wire.

4) Indoor unit circuit board (detecting circuit) trouble.

1) Drain up input trouble.

2) Poor contact of float switch circuit.

3) Float switch trouble.

Check water leaking of humidifier and clogging of drain pan.

Check operations of drain pump.

Measure resistance of indirect heater of drain sensor. (Normal: Approx. 82Ω between 1-3 of CN50)

Indoor board trouble if no other problems is detected.

Check resistance of thermistor.

0˚C : 15kΩ 10˚C 9.7kΩ

20˚C :

: :6.4kΩ 30˚C 4.3kΩ

Check contact of connector. Indoor port trouble if no other problem is detected.

Check drain pump operations.

Check connect contact.

Check float switch operations.

Page 81

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Check code Meaning, detecting method Cause Checking method & Countermeasure

4103

4109

Reverse phase abnormality

For motor abnormality

Reverse phase (or open phase) in the power system is being detected, so operation cannot be started.

If the supplemental relay Z3 has not been energized for a certain length of time, the unit will make an error stop, and the fan output will be off.

1) The phases of the power supply (L1,

L2, L3) have been reversed.

2) Open phase has occurred in the

power supply (L1, L2, L3, N).

3) The wiring is faulty.

4) The fuse is faulty.

5) T01 is faulty.

6) The circuit board is faulty.

1) Over-current breaker trip

2) Blown fuse (F1)

3) Supplemental relay (Z3)

abnormality

4) Breaking of wire

5) Disconnected connector

If there is reverse phase before the breaker, after the breaker or at the power supply terminal blocks TB1A, reconnect the wiring.

Check before the breaker, after the breaker or at the power supply terminal blocks TB1A, and if there is an open phase, correct the connections.

a) Check if a wire is disconnected. b) Check the voltage between each

of the wires.

Check 1 the connections, 2, the contact at the connector, 3, the tightening torque at screw tightening locations and 4 for wiring disconnections. TB1A~NF~TB1B~CNTR1~F3~ T01~CNTR Refer to the circuit number and the wiring diagram plate.

If F1 on the MAIN board, or F3 is melted, (Resistance between both ends of the fuse is ∞), replace the fuses.

To judge failure of the T01, go to “Indi- vidual Parts Failure Judgment Methods.”

If none of the items in 1) to 5) is applicable, and if the trouble reappears even after the power is switched on again, replace the MAIN board (when replacing the circuit board, be sure to connect all the connectors, etc. securely).

6) Problems with indoor unit

controller (I.B1, I.B2)

· Check for restricted movement of

fan, worn bearing, and pulley contact.

· Check the tension of V belt (to see if

it is too tight).

· Check the motor.

· Malfunction of 51F (with test switch

on).

Check for a blown fuse/disconnection.

· Dislocated or disconnected lead wire, incorrect wiring.

· Coil defect, contact failure.

✻ If no problems are found with the

items above, the problem lies in the board.

· Check for disconnected wire.

· Check connector contacts.

Page 82

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Check code Meaning, detecting method Cause Checking method & Countermeasure

4200 VDC

sensor/circuit abnormality

1 If VDC

304 V is detected just

before the inverter starts.

2 If VDC 750 V is detected just

before starting of and during operation of the inverter.

1) Power supply voltage is abnormal.

2) The wiring is defective.

3) The rush current prevention resistors (R1, 5) are defective.

4) The electromagnetic contactor (52C) is defective.

5) The diode stack (DS) is defective.

6) The reactor (DCL) is defective.

7) The INV board is defective.

• Check if an instantaneous power failure or power failure, etc. has occurred.

• Check if the voltage is the rated voltage value.

Check 1, the connections, 2, contact at the connectors, 3 tightening torque at screw tightened portions, 4, wiring polarities, 5, for broken wires, and 6, for grounding in the following wiring.

TB1A~NF~TB1B, TB1B~DS~[52C, R1, R5]~[C2, C3]~IPM Wiring CNDC1 (G / A) ~ CNVDC (INV) Wiring

✻ Check if the wiring polarities are as

shown on the wiring diagram plate.

To judge failure of R1 and R5, go to “Individual Parts Failure Judgment Methods.”

To judge failure of the 52C, go to “Individual Parts Failure Judgment Methods.”

To judge failure of the DS, go to “Individual Parts Failure Judgment Methods.”

To judge failure of the DCL, go to “Individual Parts Failure Judgment Methods.”

If none of the items in 1) to 6) is applicable, and if the trouble reappears even after the power is switched on again, replace the INV board (when replacing the circuit board, be sure to connect all the connectors, ground wires, etc. securely).

4115 Power supply

sync signal abnormality

The frequency cannot be determined when the power is switched on. (The power supply’s frequency cannot be detected. The outdoor fan cannot be controlled by phase control.)

1) There is an open phase in the power supply (L1, L2, L3, N).

2) The power supply voltage is distorted.

3) A fuse is defective.

4) T01 is defective.

5) The circuit board is defective.

Check before the breaker, after the breaker or at the power supply terminal blocks TB1A, and if there is an open phase, correct the connections.

If the power supply voltage waveform is distorted from a sine wave, improve the power supply environment.

If F1 on the MAIN board, or F3 is melted, (Resistance between both ends of the fuse is ∞), replace the fuses.

To judge failure of the T01, go to “Indi- vidual Parts Failure Judgment Methods.”

If none of the items in 1) to 4) is applicable, and if the trouble reappears even after the power is switched on again, replace the MAIN board (when replacing the circuit board, be sure to connect all the connectors, ground wires, etc. securely).

Page 83

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4220

4230

Bus voltage abnormality

Radiator panel overheat protection

If VDC 400 V is detected during inverter operation.

If the cooling fan stays ON for 5 minutes or longer during inverter operation, and if THHS 100°C is detected.

1) The power supply voltage is abnormal.

2) The wiring is defective.

The rush current prevention resistors (R1, 5) are defective.

The electromagnetic contactor (52C) is defective.

5) The diode stack (DS) is defective.

6) The reactor (DCL) is defective.

7) The inverter output is grounded.

8) The IPM is defective.

9) The circuit board is defective.

1) The wiring is defective.

2) The INV boar’s fuse (F01) is defective.

3) The cooling fan (MF1) is defective.

The THHS sensor is defective.

5) The air passage is clogged.

6) The IPM is defective.

7) The circuit board is defective.

• Check if an instantaneous stop or power failure, etc. has occurred.

• Check if the voltage is the rated voltage value.

Check 1, the connections, 2, contact at the connectors, 3 tightening torque at screw tightened portions, 4, wiring polarities, 5, for broken wires, and 6, for grounding in the following wiring.

TB1A~NF~TB1B, TB1B~DS~[52C, R1, R5]~[C2, C3]~IPM Wiring CNDC1 (G / A) ~ CNVDC (INV) Wiring

✻ Check if the wiring polarities are as shown on the wiring

diagram plate.

To judge failure of R1 and R5, go to “Individual Par ts Failure Judgment Methods.”

To judge failure of the 52 C, go to “Individual Parts Failure Judgment Methods.”

To judge failure of the DS, go to “Individual Parts Failure Judgment Methods.”

To judge failure of the DCL, go to “Individual Par ts Failure Judgment Methods.”

• Check the wiring between the IPM and the compressor.

• Check the compressor’s insulation resistance.

Check the IPM. Judge that the IPM is fauly, (Go to “Individual Parts Failure Judgment Methods.”)

If none of the items in 1) to 8) is applicable, and if the trouble reappears even after the power is switched on again, replace the circuit board by following procedure (when replacing the circuit board, be sure to connect all the connectors, ground wires, etc. securety) 1 If the problem is solved after the G/A board only is re-

placed, then the G/A board is defective.

2 If the problem is not solved, reinstall the G/A board and

replace the INV board. If the problem is solved, the INV board is defective.

3 If the problem is not solved by 1 and 2 above, replace

both boards.

Check 1 connections, 2 contact at the connectors and 3 for broken wires in the following wiring. MF1~CNFAN

If the fuse is defective, replace the fuse.

To judge failure of the MF1, go to “Individual Par ts Failure Judgment Methods.”

To judge failure of the THHS, go to error code “5110”.

If the air passage of the heat sink is clogged, clear the air passage.

Check the IPM. Judge that the IPM is fauly, (Go to “Individual Parts Failure Judgment Methods.”)

If none of the items in 1) to 6) is applicable, and if the trouble reappears even after the power is switched on again, replace the circuit board by following procedure (when replacing the circuit board, be sure to connect all the connectors, ground wires, etc. securety) 1 If the problem is solved after the G/A board only is re-

placed, then the G/A board is defective.

2 If the problem is not solved, reinstall the G/A board and

replace the INV board. If the problem is solved, the INV board is defective.

3 If the problem is not solved by 1 and 2 above, replace

both boards.

Check code

Meaning, detecting method

Cause Checking method & Countermeasure

Page 84

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Check code Meaning, detecting method Cause Checking method & Countermeasure

4240

4250

Over loard protection

IPM alarm output / Bus voltage abnormality

If IAC 32 Amps is detected continuously for 10 minutes during operation of the inverter after 5 or more seconds have passed since the inverter started.

1 If over current, overheat or

undervoltage of drive cirduit is detected by IPM during inverter

operation.

[Inverter error detail : 1] 2 If VDC 300 or VDC 760V

is detected during inverter operation.

[Inverter error detail : 1] 3 If IAC 39Amps is detected

during inverter operation.

[Inverter error detail : 11]

1) Air passage short cycle.

2) The heat exchanger is clogged.

3) Power supply voltage.

4) External air temperature.

5) Capacity setting error.

6) The solenoid valves (SV1, 2) are defective, or the solenoid valve drive circuit is defective.

7) The wiring is defective.

8) Fan motor (MF) operation is defective.

9) The inverter/compressor is defective.

1) The power supply voltage is abnormal.

2) The wiring is defective.

3) The inverter / compressor is defective.

Is the unit’s exhaust short cycling?

Clean the heat exchanger.

If the power supply voltage is less than 342 V, it is outside specifications.

If the external air temperature is over 43°C it is outside the specifications.

• Is the indoor unit capacity total correct?

• Are the outdoor/indoor unit capacity settings correct?

To judge failure of the solenoid valve, go to “Individual Parts Failure Judgment Methods” for the “Solenoid Valve.”

Check 1 connections, 2 contact at the connectors and 3 for broken wires in the following wiring.

TB1A~NF~TB1B TB1B~FANCON board~CN04 CNMF~MF TB1B~CNTR1 CNFC1~CNFC2

Go to “Treating Fan Motor Related Trouble.”

Go to “Treating Inverter/Compressor Related Trouble.”

• Check if an instantaneous stop or power failure, etc. has occurred.

• Check if the voltage is the rated voltage value.

Check 1, the connections, 2, contact at the connectors, 3 tightening torque at screw tightened portions, 4, wiring polarities, 5, for broken wires, and 6, for grounding in the following wiring.

TB1A~NF~TB1B, TB1A~DS~[52C, R1, R5]~[C2, C3]~IPM Wiring CNDC1 (G / A) ~ CNVDC (INV) Wiring

✻ Check if the wiring polarities are as

shown on the wiring diagram plate.

Go to “Treatment of Inverter/Output

Related Trouble.”

Page 85

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Check code Meaning, detecting method Cause Checking method & Countermeasure

4260

5101

5102

5103

5104

5105

5106

5107

5108

5109

5110

5112

Cooling fan abnormality

If the heat sink temperature (THHS) 100°C for 20 minutes or longer just before the inverter starts.

<Other than THHS> 1 A short in the thermistor or an

open circuit was sensed. The outdoor unit switches to the temporary stop mode with restarting after 3 minutes, then if the temperature detected by the thermistor just before restarting is in the normal range, restarting takes place.

2 If a short or open circuit in the

thermistor is detected just before restarting, error code

“5101”, “5102”, “5103”, “5104”, “5105”, “5106”, “5108”, “5109” or “5112” is displayed.

3 In the 3 minute restart mode,

the abnormal stop delay LED is displayed.

4 The above short or open circuit

is not detected for 10 minutes after the compressor starts, or for 3 minutes during defrosting or after recovery following de-

frosting. <THHS> If a heat sink (THHS) temperature of -40°C is detected just after the inverter starts or during inverter operation.

Outdoor unit

Discharge (TH1)

Indoor unit

Air inlet (TH21)

Outdoor unit

Low pressure saturation (TH2)

Indoor unit

Liquid pipe (TH22)

Outdoor unit

Detected switch liquid level (LD1)

Indoor unit

Gas pipe (TH23)

Outdoor unit

Detected switch liquid level (LD2)

Indoor unit

Air outlet (TH24)

Heat exchanger inlet pipe (TH5)

Ambient temperature (TH6)

Heat exchanger outlet pipe (TH7)

SC coil bypass outlet (TH8)

CS circuit (TH9)

Radiator panel (TH HS)

Compressor shell temperature (TH10)

Thermal sensor abnormality (Outdoor Unit or Indoor Unit)

Same as “4230.”

Check the thermistor’s resistance.

Check if the lead wires are pinched.

Check for tearing of the insulation.

Check if a pin is missing on the connector.

Check if a wire is disconnected.

Check the temperature picked up by the sensor using the LED monitor. If the deviation from the actual temperature is great, replace the MAIN circuit board. (In the case of the THHS, replace the INV board.)

1) Same as “4230.”

1) Thermistor

2) Lead wires are being pinched.

3) Insulation is torn.

4) A connector pin is missing, or there is faulty contact.

5) A wire is disconnected.

6) The thermistor input circuit on the MAIN circuit board is faulty. (In the case of the THHS, replace the INV board.)

Shor

t Circuit Detection Open Circuit Detection

TH1 240°C or higher (0.57 kΩ )15°C or lower (321 kΩ ) TH2 70°C or higher (1.71 kΩ ) -40°C or lower (130 kΩ

)

LD1 – -40°C or lower (130 kΩ ) LD2 – -40°C or lower (130 kΩ ) TH5 110°C or higher (0.4 kΩ ) -40°C or lower (130 kΩ ) TH6 110°C or higher (0.4 kΩ ) -40°C or lower (130 kΩ ) TH7 110°C or higher (1.14 kΩ ) -40°C or lower (130 kΩ) TH8 70 or higher (1.14 kΩ) -40°C or lower (130 kΩ ) TH9 70°C

°C

or higher (1.14 kΩ ) -40°C or lower (130 kΩ

TH21 90 or higher (0.7kΩ) -40°C or lower (130 kΩ)

°C

TH22 90 or higher (0.7kΩ) -40°C or lower (130 kΩ)

°C

TH23 90 or higher (0.7kΩ) -40°C or lower (130 kΩ)

°C

TH24 90 or higher (0.7kΩ) -40°C or lower (130 kΩ)

°C

)

THHS – -40°C or lower (2.5 MΩ ) TH10 240°C or higher (0.57 kΩ ) -15°C or lower (1656 kΩ )

Page 86

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Check code Meaning, detecting method Cause Checking method & Countermeasure

5201

5301

Pressure sensor abnormality

IAC sensor/ circuit abnormality

When pressue sensor detects

0.098MPa or less during operation, outdoor unit once stops with 3 minutes restarting mode, and restarts if the detected pressure of pressure sensor exceeds 0.098MPa bef

imediately

ore restarting.

2 If the detected pressure of sen-

sor is less than

0.098MPa

immediately before

restarting, error stop is commenced displaying 5201.

3 Under 3 minutes restarting

mode, LED displays intermittent fault check.

4 During 3 minutes after com-

pressor start, defrosting and 3 minutes after defrosting operations, trouble detection is ignored.

1 If IAC 3 Amps

3 Amps

is detected just before the inverter starts, or If IAC is detected during inverter operation after 5 seconds has passed since the inverter started when the INV board’s SW1-1 is OFF.

[Inverter error detail : 6]

2 If the current sensor (ACCT)

miss-wiring is detected during inverter operation. [Inverter error detail : 13]

1) Pressutre sensor trouble.

2) Inner pressure drop due to a leakage.

3) Broken cover.

4) Coming off of pin at connector portion, poor contact.

5) Broken wire.

6) Faulty thermistor input circuit of MAIN board.

1) Contact is faulty.

2) The current sensor (ACCT) is connected with wrong polarity.

3) The wiring is defective

4) The Ac current sensor (ACCT) is defective.

5) The IPM is defective.

See Troubleshooting of pressure sensor.

Check the contacts of CNACCT on the INV board.

Check the ACCT_U, W polarity with below drawing.

Check 1. connections.

2. contact at the connectors.

3. for broken wires in the following wiring.

CNDR2-CNDR1 CN15V2-CN15V1 IPM-MC1

To judgefailure of ACCT, go to “individual Parts Failure Judgment Methods.”

Check the IPM. Judge that the IPM is fauly, (Go to “In- dividual Parts Failure Judgment Methods.”)

ACCT_U

ACCT_W

IPM-output phase U

IPM-output phase W

Compressor-input phase U

Compressor-input phase W

Red wire

Black wire

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Check code Meaning, detecting method Cause Checking method & Countermeasure

5301 If none of the items in 1) to 5) is appli-

cable, and if the trouble reappears even after the power is switched on again, replace the circuit board by following procedure (when replacing the circuit board, be sure to connect all the connectors, ground wires, etc. securety) 1 If the problem is solved after the

G/A board only is replaced, then the G/A board is defective.

2 If the problem is not solved, rein-

stall the INV board and replace the INV board. If the problem is solved, the INV board is defective.

3 If the problem is not solved by 1

and 2 above, replace both boards.

6) The circuit board is defective.IAC sensor/ circuit abnormality

1 If IAC 3 Amps is detected just

before the inverter starts, or If IAC 3 Amps is detected during inverter operation after 5 seconds has passed since the inverter started when the INV board’s SW1-1 is OFF. [Inverter error detail : 6]

2 If the current sensor (ACCT)

miss-wiring is detected during inverter operation. [Inverter error detail : 13]

Different indoor model connected abnormality

An exclusive R22 refrigerant indoor unit was connected to a R407C refrigerant outdoor unit.

1) An error was made in the MAIN

board of the outdoor unit (replaced with the wrong circuit board).

2) An error was made in selecting the

indoor unit (installation error).

3) An error was made in the indoor

unit’s circuit board (replaced with the wrong circuit board).

If the model name plate on the outdoor unit says that it is an exclusive R22 model, and if error “7130” has occurred, the MAIN board for the outdoor unit is a R407C model circuit board, so replace it with the MAIN board for the R22 model.

If the model name plate for the indoor unit is an exclusive R22 model, install a unit which can also operate with R407C.

If the model name plate on the indoro unit indicates that it is also capable of operating with R407C, and error “7130” occurs, the indoor unit’s circuit board is for an exclusive R22 model, so replace it with the circuit board for a unit which is also capable of using R407C.

7130

Check

code

6600

6602

Multiple address error

Transmission from units with the same address is detected.

Note:

The address/attribute shown on remote controller indicates the controller which has detected error.

Transmission processor hardware error

Though transmission processor intends to transmit “0”, “1” is displayed on transmission line.

Note:

The address/attribute shown on remote controller indicates the controller which has detected error.

Meaning, detecting method Cause Checking method & Countermeasure

At the genration of 6600 error, release the error by remote controller (with stop key) and start again. a) If the error occures again within 5 minutes.

→ Search for the unit which has the same address

with that of the source of the trouble.

When the same address is found, turn off the power source of outdoor unit, BC controller, and indoor unit for 5 minutes or more after modifying the address, and then turn on it again.

b) When no trouble is generated even continuing

operation over 5 minutes.

→ The transmission wave shape/noise on the

transmission line should be investigated in accordance with <Investigation method of transmission wave shape/noise>.

1) Two or more controllers of outdoor unit, indoor unit, remote controller, BC controller, etc. have the same address.

2) In the case that signal has changed due to noise entered into the transmission signal.

1) At the collision of mutual transmission data generated during the wiring work or polarity change of the transmission line of indoor or outdoor unit while turning the power source on, the wave shape is changed and the error is detected.

2) 100V power source connection to indoor unit or BC controller.

3) Ground fault of transmission line.

4) Insertion of power supply connector (CN40) of plural outdoor units at the grouping of plural refrigerant systems.

5) Insertion of power supply connector (CN40) of plural outdoor units in the connection system with MELANS.

6) Faulty controller of unit in trouble.

7) Change of transmission data due to the noise in transmission.

8) Connection system with plural refrigerant systems or MELANS for which voltage is not applied on the transmission line for central control.

[2] Communication / System

Page 88

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Transmission processor hardware error

Transmission circuit bus-busy error 1 Collision of data transmission:

Transmission can not be performed for 4~10 consecutive minutes due to collision of data transmission.

2 Data can not be transmitted on

transmission line due to noise for 4~10 consecutive minutes.

Note:

The address/attribute shown on remote controller indicates the controller which has detected error.

Checking method and processing

1) As the voltage of short frequency like

noise is mixed in transmission line continuously, transmission processor can not transmit.

2) Faulty controller of generating unit.

a) Check transmission wave shape/noise on trans-

mission line by following <Investigation method of transmission wave shape/noise>.

→ No noise indicates faulty controller of generat-

ing unit.

→ Noise if existed, check the noise.

Check

code

6602

6603

Meaning, detecting method Cause Checking method & Countermeasure

Transmission line

installed while turning

power source on?

Check power source of indoor unit.

220V ~ 240V?

Shut off the power source of outdoor/indoor units/BC controller and make it again.

Erroneous power source work

Erroneous transmission work

Check transmission line work and shield finish

Ground fault or shield

contacted with transmission

line?

System composition?

Single refrigerant system

Investigation of transmission line noise

Modification of faulty point

Replace insertion of CN40 to CN41

CN40 inserted?

Confirm supply power connector CN40 of outdoor unit

MELANS connected system

Investigation of the cause of noise

✻ For the investigation method, follow <Investiga-

tion method of transmission wave shape/noise>

Modification of CN40 insertion method.

Only 1 set with

CN40 inserted?

Noise exist?

Faulty controller of generating unit

Plural refrigerant system

Confirm supply power connector CN40 of outdoor unit

YES

Page 89

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Shut down OC power source simultaneously for 5 minutes or more, and make them again. It will return to normal state at an accidental case. When normal state can not be re-covered, check for the 1) ~ 4) of the cause.

Check

code

6607

Meaning, detecting method

No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by

transmission side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the controller

not providing the answer (ACK).

1 Outdoor

unit (OC)

2 Indoor

unit (IC)

3 Remote

controller (RC)

(1) Single refrigerant system

Remote controller (RC)

System compo-

sition

Generating

unit address

Display of

trouble

Detecting

method

Cause Checking method & countermeasure

No reply (ACK) at IC transmission to OC

No reply (ACK) at RC transmission to IC

No reply (ACK) at IC transmission to RC

1) Poor contact of transmission line of OC.

2) Damping of transmission line voltage/signal by acceptable range of transmission wiring exceeded.

Farthest : Less than 200m Remote controller wiring : Less than 10m

3) Erroneous sizing of transmission line (Not within the range below). Wire diameter : 1.25mm

or more

4) Faulty control circuit board of OC.

1) When IC unit address is changed or modified during operation.

2) Faulty or slipping off of transmission wiring of IC.

3) Slipping off of IC unit connector (CN2M).

4) Faulty IC unit controller.

5) Faulty remote controller.

1) Faulty transmission wiring at IC unit side.

2) Faulty transmission wiring of RC.

3) When remote controller address is changed or modified during operation.

4) Faulty remote controller.

Shut down OC unit power source, and make it again. It will return to normal state at an accidental case. When normal state can not be re-covered, check for the 1) ~ 4) of the cause.

Shut down OC power sources for 5 minutes or more, and make it again. It will return to normal state at an accidental case. When normal state can not be re-covered, check for the 1) ~ 4) of the cause.

Check

code

6606

Meaning, detecting method Cause Checking method & Countermeasure

1) Data is not properly transmitted due to casual errouneous operation of the generating controller.

2) Faulty generating controller.

Communications with transmission processor error

Communication trouble between apparatus processor and transmission processor.

Note:

The address/attribute shown on remote controller indicates the controller which has detected error.

Turn off power sources of indoor unit, BC controller and outdoor unit.

When power sources are turned off separately, microcomputer is not reset and normal operations can not be restored.

→ Controller trouble is the source of the trouble

when the same trouble is observed again.

Page 90

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Check

code

6607

(continued)

Meaning, detecting method

System compo-

sition

Generating

unit address

Display of

trouble

Detecting

method

Cause Checking method & countermeasure

No ACK error When no ACK signal is detected in 6 continuous times with 30 second

interval by transmission side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the

controller not providing the answer (ACK).

1 Outdoor

unit (OC)

2 Indoor

unit (IC)

3 Remote

controller (RC)

Remote controller (RC)

No reply (ACK) at BC transmission to OC

No reply (ACK) at RC transmission to IC

No reply (ACK) at IC transmission to RC

As same that for single refrigerant system.

1) Cause of 1) ~ 5) of “Cause for single refrigerant system”.

2) Slipping off or short circuit of transmission line of OC terminal block for centralized control (TB7).

3) Shut down of OC unit power source of one re-frigerant system.

4) Neglecting insertion of OC unit power supply connector (CN40).

5) Inserting more than 2 sets of power supply connector (CN40) for centralized control use.

For generation after normal operation conducted once, the following causes can be considered.

• Total capacity error (7100)

• Capacity code setting error (7101)

• Connecting set number error (7102)

• Address setting error (7105)

1) Cause of 1) ~ 3) of “Cause for single refrigerant system”.

2) Slipping off or short circuit of transmission line of OC terminal block for centralized con-trol (TB7).

3) Shut down of OC unit power source of one refrigerant system.

4) Neglecting insertion of OC unit power supply connector (CN40).

5) Inserting more than 2 sets of power supply connector(CN40) for centralized control use.

At generation after normal operation conducted once, the following causes can be considered.

• Total capacity error (7100)

• Capacity code setting error (7101)

• Connecting set number error (7102)

• Address setting error (7105)

Same as measure for single refrigerant system.

a) Shut down the power source of both

IC and OC for over 5 minutes simultaneously, and make them again. Normal state will be returned incase of accidental trouble.

b) Check for 1) ~ 5) of causes. If cause

is found, remedy it.

c) Check other remote controller or OC

unit LED for troubleshooting for trouble.

Trouble →

Modify the trouble according to the content of check code.

No trouble → Faulty indoor con-

troller

a) Shut down the power source of OC

for over 5 minute, and make it again. Normal state will be returned in case of accidental trouble.

b) Check for 1) ~ 5) of causes. If cause

is found, remedy it. When normal state can not be obtained, check 1) ~ 5) of causes.

(2) Group operation system using plur

al refrigerants

Page 91

- 90 -

Check

code

6607

(continued)

Meaning, detecting method

System compo-

sition

Generating

unit address

Display of

trouble

Detecting

method

Cause Checking method & countermeasure

No ACK error When no ACK signal is detected in 6 continuous times with 30 second

interval by transmission side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the

controller not providing the answer (ACK).

(3) Connecting system with system controller (MELANS)

1 Outdoor

unit (OC)

2 Indoor

unit (IC)

3 Remote

controller (RC)

Remote controller (RC)

No reply (ACK) at IC transmission to OC

No reply (ACK) at transmission of SC to IC

No reply (ACK) at transmission of IC to RC

No reply (ACK) at transmission of MELANS to RC

As same that for single refrigerant system.

Trouble of partial IC units:

1) Same cause as that for single refrigerant system.

Trouble of all IC in one refrigerant system:

1) Cause of total capacity error. (7100)

Cause of capacity code setting error. (7101)

3) Cause of connecting number error. (7102)

4) Cause of address setting error. (7105)

5) Slipping off or short circuit of transmission line of OC unit terminal block for central control (TB7).

6) Power source shut down of OC unit.

7) Trouble of OC unit electrical system.

Trouble of all IC:

1) As same that for single refrigerant system.

2) Insertion of power supply connector (CN40) into OC unit transmission line for centralized control.

3) Slipping off or power source shut down of power supply unit for transmission line.

4) Faulty system controller (MELANS).

Same cause as that for plural refrigerant system.

Trouble of partial IC units:

1) Same cause of that for single refrigerant system.

Trouble of all IC in one refrigerant system:

1) Error detected by OC unit. Total capacity error. (7100) Capacity code setting error. (7101) Connecting number error. (7102) Address setting error. (7105)

2) Slipping off or short circuit of transmission line of OC unit terminal block for central control (TB7).

3) Power source shut down of OC unit.

4) Trouble of OC unit electrical system.

Trouble of all IC:

1) As same that for single refrigerant system.

2) Insertion of power supply connector (CN40) into OC unit transmission line for central-ized control.

3) Slipping off or power shutdown of power supply unit for transmission line.

4) Faulty MELANS.

Same countermeasure as that for single refrigerant system.

→ Same countermeasure as that for

single refrigerant system.

Confirm OC trouble diagnosis LED. → At trouble generation, check for the

content according to check code.

Check the content of 5)~7) shown left.

Confirm voltage of transmission line for centralized control.

• More than 20V → Confirm 1) 2) left.

• Less than 20V → Confirm 3) left.

Same countermeasure as that for plural refrigerant system.

→ Same countermeasure as that for

single refrigerant system.

Confirm OC trouble diagnosis LED. → At trouble generation, check for the

content according to check code.

Check the content of 2)~4) shown left.

Check the causes of 1) ~ 4) left.

Page 92

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Check

code

6607

(continued)

Meaning, detecting method

System compo-

sition

Generating

unit address

Display of

trouble

Detecting

method

Cause Checking method & countermeasure

No ACK error When no ACK signal is detected in 6 continuous times with 30 second

interval by transmission side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the

controller not providing the answer (ACK).

(3) Connecting system with system controller (MELANS)

5 System

controller (SC)

Address which should not be existed

Remote controller (RC)

Trouble of partial remote controller:

1) Faulty wiring of RC transmission line.

2) Slipping off or poor contact of RC transmission connector.

3) Faulty RC.

Trouble of all IC in one refrigerant system.

1) Error detected by OC unit.

Total capacity error (7100) Capacity code setting error (7101) Connecting number error (7102) Address setting error (7105)

2) Slipping off or short circuit of transmission line of OC unit terminal block for central control (TB7).

3) Power source shut down of OC unit.

4) Trouble of OC unit electrical system.

Trouble of all RC:

1) As same that for single refrigerant system.

2) Inserting supply power connector (CN40) to OC transmission line for centralized control.

3) Slipping off or power shutdown of power supply unit for transmission line.

4) Faulty MELANS.

1) IC unit is keeping the memory of the original group setting with RC although the RC address was changed later. The same symptom will appear for the registration with SC.

2) IC unit is keeping the memory of the original interlocking registration with Fresh Master with RC although the Fresh Master address was changed later.

No reply (ACK) at transmission of IC to SC

Check 1) ~ 3) left.

Confirm OC trouble diagnosis LED. → At trouble generation, check for the

content according to check code.

Check the content of 2) ~ 4) shown left.

Check the causes 1)~4) left.

As some IC units are keeping the memory of the address not existing, delete the information. Employ one of the deleting method among two below.

1) Deletion by remote controller. Delete unnecessary information by the manual setting function of remote controller.

2) Deletion by connecting information deleting switch of OC unit.

Be careful that the use of this method will delete all the group information set with RC and all the interlocking information of Fresh Master and IC unit.

1 Shut down OC unit power source,

and wait for 5 minutes.

2 Turn on the dip switch SW2-2 pro-

vided on OC unit control circuit board.

3 Make OC unit power source, and

wait for 5 minutes.

4 Shut down OC unit power source,

and wait for 5 minutes.

5 Turn off the dip switch SW2-2 pro-

vided on OC unit control circuit board.

6 Make OC unit power source.

No relation with system

Page 93

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Check

code

6608

Meaning, detecting method Cause Checking method & Countermeasure

No response error

Though acknowledgement of receipt (ACK) is received after transmission, no response command is returned. Detected as error by transmission side when the same symptom is re-peated 10 times with an interval of 3 seconds.

Note:

The address/attribute shown on remote controller indicates the controller which has detected error.

1) At the collision of mutual transmission data when transmission wiring is modified or the polarity is changed while turning the power source on, the wave shape changes detecting error.

2) Repeating of transmission error due to noise.

3) Damping of transmission line voltage/signal due to exceeding of the acceptable range for transmission wiring.

• Farthest Less than 200m

• RC wiring Less than 12m

4) Damping of transmission voltage/ signal due to improper type of transmission line.

• Wire size : More than 1.25mm

a) Generation at test run.

Turn off the power sources of OC unit, IC unit and Fresh Master for more than 5 minutes simultaneously, and make them again. → Returning to normal state means the trouble detection due to transmission line work while powering.

b) Check 3) and 4) of the causes left.

c) Investigate the transmission wave shape/noise

on transmission line according to <Investigation method of transmission wave shape/noise>.

Much possibility if 6602 is generated.

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6832

6833

1) Total capacity of indoor units in the same refrigerant system exceeds the following:

2) Erroneous setting of OC model selector switch (SW3-10).

Check

code

7100

Meaning, detecting method Cause Checking method & Countermeasure

Total capacity error

Total capacity of indoor units in the same refrigerant system exceeds limitations.

Trouble source: Outdoor unit

a) Chec

6831

k for the model total (capacity cord total) of

indoor units connected.

b) Check whether indoor unit capacity code (SW2)

is wrongly set.

For erroneous switch setting, modify it, turn off power source of outdoor unit, and indoor unit simultaneously for 5 minutes or more to modify the switch for setting the model name (capacity coad).

Check for the model selector switch (Dip switches SW3-10 on outdoor unit control circuit) of OC.

Total capacity Total capacity code

325 65

ON OFF

2345

SW3

678910

MA communication no-reception error

Problem with the communication between MA remote controllers and indoor units No instance of successful reception of data in a 3-minute period.

6834

MA communication, start but detection error

Problem with the communication between MA remote controllers and indoor units. No instance of successful reception of signals in a 2-minute period.

MA communication, sync restoration error

Problem with the communication between MA remote controllers and indoor units. Failure to detect opening in the transmission path and the signal could not be sent. Indoor unit: for 3 minutes Remote controller: for 6 minutes

MA communication, transmission-reception H/W error

Problem with the communication between MA remote controllers and indoor units. Then transmitted data and received data that are collected at the same time differs 30 times in a row.

1) Contact failure of MA remote controller or indoor unit remote controller wiring.

2) All the remote controllers are set to “Sub”.

3) Failure to meet wiring specifications

1 Wire length 2 Wire diameter 3 Number of remote controllers 4 Number of indoor units

4) Remote controller was connected and then removed without power reset.

5) Noise interference on the remote controller transmission channel.

6) Problems with the remote controller transmission/reception circuit in the indoor unit.

7) Problems with the transmission/reception circuit in the remote controller.

1) Contact failure of MA remote controller or indoor unit remote controller wiring.

More than 1 “Main” remote controller

3) Multiple indoor unit address

4) Noise interference in the remote controller line.

5) Failure to meet wiring specifications.

1 Wire length 2 Wire diameter 3 Number of remote controllers 4 Number of indoor units

6) Problems with the transmission/reception circuit in the remote controller.

a) Check for loose or disconnected indoor unit or

MA remote controller transmission lines.

b) Confirm that the power is fed to main power

supply and remote controller line.

c) Confirm that MA remote controller

’s maximum

capacity is not exceeded.

d) Check the Main/Sub setting of the MA remote

controller; one of must be set to sub.

e) Diagnose the remote controller (described on

the remote controller IM) Results

[OK] : No problems with the remote control-

ler (check the wiring rules) [NO] : Replace the remote controller [6832, 6833, ERROR] : Noise interference

(Go to item f) )

f) Check the transmission wave patterns of and

interference in the MA remote controller transmission signal. Refer to section 4 Transmission Wave Pattern and Noise Check.

g) When no problems were found in items a)

through f), replace the indoor controller board or the MA remote controller

The following information can be obtained

from LED1 and 2 on the indoor controller board:

LED1 is on : Main switch of the indoor unit

is on.

LED2 is on : MA remote controller line is

being powered.

[3] System error

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7111

7130

Remote control sensor error

Error not providing the temperature designed to remote controller sensor.

Trouble source : Indoor unit

Different Indoor model controller connected error

1) In case when the old type remote controller for M-NET is used and the remote controller sensor is designed on indoor unit. (SW1-1 turned ON)

A indoor unit not for the R407C (model: P250/500) is connected.

a) Replace the old remote controller by the new

remote controller.

Use the P250/500 indoor unit.

1) Power to the power supply extension unit for transmission line is shut off.

2) Power reset of the power supply extension unit for transmission line and outdoor unit.

a) Confirm that the power supply to the power

sully extension unit for transmission wire is not connected to the indoor unit’s switch, thus cutting off the power. (The unit will not operate normally unless the power to the power supply extension unit for transmission line is turned on→power reset the outdoor unit.)

7110

Indoor units cannot operate because they are not connected to the correct outdoor units in the same refrigerant circuit.

7105 Address setting error

• Erroneous setting of OC unit address

• Erroneous setting of BC controller address

Trouble source : Outdoor unit

2) The Outdoor unit address is being set to 51~100 under automatic address mode (Remote controller displays “HO”).

3) Slipping off of transmission wiring at Outdoor unit.

4) Short circuit of transmission line in case of 3) & 4), remote controller displays “HO”.

1) Setting error of Outdoor unit address. The address of Outdoor unit is not being set to 51~100.

d) Check for the model total (capacity code total)

of indoor units connected.

Check that the address of OC unit is being set to 51~100. Reset the address if it stays out of the range, while shutting the power source off. When BC controller is out of the range, reset it while shutting the power source of both OC unit off.

1) The Indoor unit model name (model code) connected is not connectable.

Connectable range.....20~250

2) Erroneous setting of the switch (SW2) for setting of model name of Indoor unit connected.

1) Number of unit connected to terminal block (TB3) for outdoor/indoor transmission line exceeds limitations given be-lows:

Item Limitation

Total of Indoor unit

Check

code

7101

7102

Meaning, detecting method Cause Checking method & Countermeasure

Capacity code error

Error display at erroneous connection of Indoor unit of which model name can not be connected.

Trouble source : Outdoor unit Indoor unit

Connected unit count over

Number of units connected in the same refrigerant system exceeds limitations.

Trouble source: Outdoor unit

a) Check for the model name of the Indoor unit

connected.

b) Check for the switch (SW2 if indoor controller

for setting of Indoor unit model name of generating address. When it is not agreed to the model name, modify the capacity code while shutting off the power source of Indoor unit.

✻ The capacity of Indoor unit can be confirmed by

the self-diagnosios function (SW1 operation) of Indoor unit.

a) Check whether the connection of units to the

terminal block for indoor/outdoor transmission wiring (TB3) of outdoor unit is not exceeding the

limitation. b) Check for 2), 3), and 4). c) Check for the connection of transmission wiring

to the terminal block for centralized control

erroneously connected to the indoor/outdoor

transmission wiring terminal block (TB3).

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Symptoms

< Diagnostic Method and Remedy >

Causes Diagnostic Method and Remedy

There is no response when pressing Power ON on the remote controller (Power-on indicator on the remote controller is off)

1) No power is supplied to the indoor unit by the transformer

1Main switch of the indoor unit is off 2Connectors (CND, CNT, CN3T) on the indoor controller board

are unplugged

3Fuses on the indoor controller board are blown out 4Transformer on the indoor unit is not working, Torn wires

2) MA remote controller line is wired incorrectly

1MA remote controller line is torn or disconnected from terminal

board

2Short-circuited MA controller line 3MA remote controller line is wired incorrectly 4MA remote controller line is connected to TB5 5MA remote controller line is accidentally connected to AC 200V

power-source line terminal

6MA remote controller line is accidentally connected to M-NET

Transmission line terminal in the indoor unit

3) More than the permissible number of remote controllers (2) are connected to the unit

4) The length or diameter of MA remote controller does not meet the specifications

5) Remote Display Output line on the indoor unit is short-circuited or the relays are connected with wrong polarities

6) Faulty indoor controller board

7) Problems with MA remote controller

a) Check MA remote controller terminal

voltage (between A and B)

a. Voltage between DC9-12

→Problem with remote controller

b. No voltage

• Check items 1 and 3 on the left

→Correct the problem if found.

• If neither 1 nor 3 applies

→Go to b)

b) Disconnect the remote controller line

from TB13 on the indoor unit, and check the voltage between A and B.

a. Voltage between DC 9-12

→Check items 2) and 4) on the left. Correct the problem if found.

b. No voltage

• Check 1) on the left again.

→Correct the problem if found.

• If no problem is found with item

1), check Remote Display Line (i.e. polarity of the relay)

• If still no problem is found, replace the indoor controller board.

Display on the LED remains for a few seconds then disappears when turning on power with the remote controller

1) M-NET Transmission is powered by the outdoor unit

1Main switch on the outdoor unit is OFF. 2Connectors on the main board of the outdoor unit are unplugged

Main controller board ·············· CNS1, CNVCC3 Inverter board ························· CNDC2, CNVCC2, CNL2 Gate-amp terminal board ········ CNDC1

3Faulty outdoor power supply circuit

• Blown fuse on G/A board (F01)

• Damaged diode stack

• Faulty Inverter board

• Surge breaker resistance (R1) loss

2) Shorted transmission line

3) Faulty wiring of M-NET transmission line on the outdoor unit

1Torn transmission line, disconnected line from terminal 2Indoor transmission line accidentally connected to TB7

4) Torn M-NET line on the indoor unit

5) Disconnected lines or unplugged connectors between M-NET transmission terminal (TB5) and Indoor controller board CN2M

If one of the items 1)-5) on the left is the cause, LED5 (M-NET Transmission voltage indicator) on the indoor controller board will be off.

When 2) or 3) is the cause, error message 7102 will be displayed on the self-diagnosis LED on the outdoor unit.

YES

Self-Diagnoses LED Check

Check the voltage of trans-

mission terminal board TB15

Faulty MA remote

controller or indoor

controller board

Check items

2) and 3)

Check item 4)

9~12V?

Check item 5)

Fix any problems

found

Fix any problems

found

Check item 1)

Are all units in the

refrigerant circuit experiencing

the same problem?

Is Error Code 7102 displayed?

Was the

problem solved?

[4] Troubleshooting using information on problems with Remote Control, Input from

External Source

(1) MA Remote Control

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Symptoms

< Diagnostic Method and Remedy >

Causes

'HO' on the display cannot be turned off, and the switch does not respond.

1) M-NET Transmission is powered by the outdoor unit

1Main switch on the outdoor unit is off 2Connectors on the main board of the outdoor unit are unplugged

Main controller board ·············· CNS1,CNVCC3 Inverter board ························· CNDC2, CNVCC2, CNL2 Gate-amp terminal board ········ CNDC1

3Faulty outdoor power supply circuit

• Blown fuse on G/A board

• Faulty Inverter board

• Damaged diode stack

• Surge breaker resistance (R1) Loss

2) Shorted transmission line

3) Faulty wiring of M-NET transmission line on the outdoor unit

1Torn transmission line, disconnected line from terminal 2Indoor transmission line is accidentally connected to TB7

4) Torn M-NET line on the indoor unit

5) Disconnected lines or unplugged connectors between M-NET transmission terminal (TB5) and Indoor controller board CN2M

6) MA remote controller line is wired incorrectly

1Short-circuited MA controller line 2MA remote controller line (No.2) is torn or disconnected from

terminal board

3Faulty wiring among grouped units. 4MA remote controller line is accidentally connected to TB5 5M-NET transmission line is accidentally connected to TB15

7) A different address other than the indoor unit address +50 is used for the outdoor unit

8) The address of the indoor unit is set above 51

9) MA remote controller is set as subordinate

10) Faulty indoor controller board (MA remote controller

communication circuit)

11) Faulty remote controller

If one of the items 1)~4) is the cause of the problem, LED 5 on the indoor control board will be off.

If one of the items 2), 3), or 5) is the cause of the problem, Error Code 7102 will be displayed on the self-diagnosis LED on the outdoor unit.

YES

Self-Diagnoses LED Check

Check the voltage of trans-

mission terminal board TB15

Faulty MA remote

controller or indoor

controller board

Check items

2) 3) and 6)

Check item 4)

9~12V?

Check items

5), 6), 8), and 9)

Fix any problems

found

Fix any problems

found

Check item 1)

Are all units in the

refrigerant circuit experiencing

the same problem?

Is Error Code 7102 displayed?

Was the

problem found?

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YES

MA Remote controller

cannot be operated

Nothing appears

on the display

Units grouped by

MA remote controller?

LED2 on the controller

board of another

indoor unit is off

Power OFF on

all indoor units?

Does LED2 on the control

board in one of the indoor units

come on when MA remote

control line was disconnected?

Is there any indoor unit

whose LED2 on all

control boards are off?

Is the above condition

restored when rewired?

Check loosened screws on remote control wiring

Go to P95 items 1-2

Check remote

controller wiring

Is indoor unit

powered off?

Short-circuited

remote controller

line?

Replace the indoor unit controller board

LED1 on control board

in indoor unit blinking

(at 20 sec. intervals)

'HO' is displayed on

the screen and cannot

be turned off

Can the remote

controller be

operated?

Normal (including the display 'Centralized Control')

Go to the section

on the error message

displayed

Check M-NET

transmission line

Go to P95 item 2

No2 Refrigerant

Circuit check

Is error message 6602 or 6607 displayed if continuing to operate the

remote controller?

No.1-refrigerant

circuit is normal. No.2-

refrigerant circuit

would not start

Did you only turn

indoor units back on?

Go to P95 item 2

No.1-refrigerant

circuit check

Continues for 3 minutes or longer

Go to item 3 on P96

No (steady ON or OFF)

Go to P95 item 1

Turn on the power

Check wiring

Go to P95 item 1

When main power is turned on, MA remote displays 'HO' while the unit is starting up

Comes off within 3 minutes

Replace MA remote controller

✻After correcting the

problem, connect back MA remote controller line

Flow chart: When MA remote controller does not respond.

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YES

Cannot be remote-controlled

DIPSW3-8

OFF?

DIPSW1-10

ON?

Is the dipswitch

'Normal/Maintenance' set

to 'Maintenance'?

Does the pulse

input conform to specified

value (over 200ms)?

Is indoor unit

malfunctioning?

Disconnect external wiring and

shot-circuit TB22 and BC-B1.

Apply voltage to AC-A1.

Short-circuit CN51-1 and -2

on the controller board.

Can unit be turned on and off?

Replace the controller board

Set DIPSW3-8 to ON.

Set DIPSW1-10 to OFF.

Set it to Normal.

Follow the specification (over 200ms).

Go to the section on the displayed error.

Check external wiring, or external pulse wave patterns.

Either input/output board or wiring between controller board and input/output board needs to be replaced.

over 200ms

Under 200ms

(2) Input from External Source

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Transmission Wave Pattern and Noise Check

[1] M-NET Transmission

This series of air conditioning units is controlled by sending signals among centralized control, outdoor units, and indoor units. Noise entering transmission line interferes with normal signal transmission and causes malfunctions.

(1) Symptoms caused by noise

(2) Wave Pattern Check

Check wave patterns in transmission line with an oscilloscope, and make sure that the following conditions are met: 1No fine wave patterns (noise) are

found. Fine noises (around 1V) may be picked up when operating DC-DC converter or inverter. This noise will not cause problems if units and transmission line are shield-earthed.

2Voltage of transmission signals

meet the following conditions:

[With transmission]

[Without transmission]

No fine noise allowed

No fine noise

allowed

52µs 52µs 52µs 52µs 52µs

VBN

VHL

logical

value

“0”

ogica value

“1”

Transmission line voltageLogical Value

VHL over 2.0V0

BVN over 1.3V1

Cause Symptoms

Error

Codes

Definitions

Noise infiltration

Alters signals and they are mistaken for other address signals

Transmission wave patterns are changed. Wave patterns are changed and become unrecognizable and

the receiving end of the signal becomes unable to respond. Un-communicable state lasts due to fine noise.

Signals can be sent, but response cannot be sent or received.

6600

6602

6607

6603

6607 6608

Multiple-Address Error

Transmission Processor H/W Error

Non-acknowledgeable Signals Error

Transmission Circuit Bus-Busy Error

Non-acknowledgeable Signals Error No Response Error

1Make sure that transmission line and power-supply

line are not cross-connected

2Make sure that transmission line in one system is not

bundled with transmission line in another system

3Make sure specified transmission wire is used

Place transmission wire as far away from power source line as possible (at least 5cm). Do not put them in the same conduit.

Do not bundle transmission lines, since they may cause malfunctions.

Use specified transmission wire

• For systems using shield wire Type of transmission wire - shield wire CVVS, CPEVS Wire Diameter-over 1.25mm

Check Points Remedies

Wiring Check

(3) Identifying noise source and remedying the problems

1Treatment of Noise

Check the following when noise is picked up or when error codes in section (1) are displayed on the LED.

Mitsubishi PUD-P250YMF-C, PFD-P500VM-A, PFD-P250VM-A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual