Mitsubishi Electric PURY-RP200, PURY-RP250, PURY-RP300YJM-BM, PURY-RP300YJM-B Service Manual
Service Handbook
Service Handbook
PURY-RP200, RP250, RP300YJM-B
Model
2011
AIR CONDITIONER
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HWE10140 GB
Safety Precautions
Before installing the unit, thoroughly read the following safety precautions.
Observe these safety precautions for your safety.
WARNING
This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid
the risk of serious injury or death.
CAUTION
This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid
the risk of serious injury or damage to the unit.
After reading this manual, give it to the user to retain for future reference.
Keep this manual for easy reference. When the unit is moved or repaired, give this manual to those who provide these
services.
When the user changes, make sure that the new user receives this manual.
WARNING
Do not use refrigerant other than the type indicated in
the manuals provided with the unit and on the nameplate.
Doing so may cause the unit or pipes to burst, or result in
explosion or fire during use, during repair, or at the time of
disposal of the unit.
It may also be in violation of applicable laws.
MITSUBISHI ELECTRIC CORPORATION cannot be held
responsible for malfunctions or accidents resulting from the
use of the wrong type of refrigerant.
Ask your dealer or a qualified technician to install the
unit.
Improper installation by the user may result in water leakage, electric shock, smoke, and/or fire.
Properly install the unit on a surface that can withstand the weight of the unit.
Unit installed on an unstable surface may fall and cause injury.
Only use specified cables. Securely connect each cable so that the terminals do not carry the weight of the
cable.
Improperly connected or fixed cables may produce heat
and start a fire.
Take appropriate safety measures against strong
winds and earthquakes to prevent the unit from falling.
If the unit is not installed properly, the unit may fall and
cause serious injury to the person or damage to the unit.
Do not make any modifications or alterations to the
unit. Consult your dealer for repair.
Improper repair may result in water leakage, electric shock,
smoke, and/or fire.
Do not touch the heat exchanger fins.
The fins are sharp and dangerous.
In the event of a refrigerant leak, thoroughly ventilate
the room.
If refrigerant gas leaks and comes in contact with an open
flame, poisonous gases will be produced.
When installing the All-Fresh type units, take it into
consideration that the outside air may be discharged
directly into the room when the thermo is turned off.
Direct exposure to outdoor air may have an adverse effect
on health. It may also result in food spoilage.
Properly install the unit according to the instructions
in the installation manual.
Improper installation may result in water leakage, electric
shock, smoke, and/or fire.
Have all electrical work performed by an authorized
electrician according to the local regulations and instructions in this manual, and a dedicated circuit must
be used.
Insufficient capacity of the power supply circuit or improper
installation may result in malfunctions of the unit, electric
shock, smoke, and/or fire.
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HWE10140 GB
WARNING
Securely attach the terminal block cover (panel) to the
unit.
If the terminal block cover (panel) is not installed properly,
dust and/or water may infiltrate and pose a risk of electric
shock, smoke, and/or fire.
Only use the type of refrigerant that is indicated on the
unit when installing or reinstalling the unit.
Infiltration of any other type of refrigerant or air into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.
When installing the unit in a small room, exercise caution and take measures against leaked refrigerant
reaching the limiting concentration.
Consult your dealer with any questions regarding limiting
concentrations and for precautionary measures before installing the unit. Leaked refrigerant gas exceeding the limiting concentration causes oxygen deficiency.
Consult your dealer or a specialist when moving or reinstalling the unit.
Improper installation may result in water leakage, electric
shock, and/or fire.
After completing the service work, check for a gas
leak.
If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, poisonous gases may be
produced.
Do not try to defeat the safety features of the unit.
Forced operation of the pressure switch or the temperature
switch by defeating the safety features of these devices, or
the use of accessories other than the ones that are recommended by MITSUBISHI may result in smoke, fire, and/or
explosion.
Only use accessories recommended by MITSUBISHI.
Ask a qualified technician to install the unit. Improper installation by the user may result in water leakage, electric
shock, smoke, and/or fire.
Control box houses high-voltage parts.
When opening or closing the front panel of the control box,
do not let it come into contact with any of the internal components. Before inspecting the inside of the control box,
turn off the power, keep the unit off for at least 10 minutes,
and confirm that the voltage between FT-P and FT-N on
INV Board has dropped to DC20V or less. (It takes about
10 minutes to discharge electricity after the power supply is
turned off.)
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HWE10140 GB
Precautions for handling units for use with R410A
CAUTION
Use refrigerant piping made of phosph orus deoxidized
copper and copper alloy seamle ss pipes an d tubes. In
addition, be sure that the inner and outer surfaces and
the end faces of the existing and new pipes are clean
and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminant.
Contaminants on the inside of the refrigerant piping may
cause the refrigerant oil to deteriorate or cause the air conditioning unit to malfunction.
Store the new piping to be used during installation indoors and keep both ends of the piping sealed until
just before brazing. (Store elbows and other joints in a
plastic bag.)
If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and compressor failure may result.
Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Infiltration of a large amount of mineral oil may cause the refrigerant oil to deteriorate or ca u s e th e a i r co nd i tioning unit
to malfunction.
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and
may result in performance loss.
Use a vacuum pump with a reverse-flow check valve.
If a vacuum pump that is not equipped with a reverse-flow
check valve is used, the vacuum pump oil may flow into the
refrigerant cycle and cause the refrigerating machine oil to
deteriorate.
Prepare tools for exclusive use with R410A. Do not use
the following tools if they have been used with the conventional refrigerant (gauge manifold, charging hose,
gas leak detector, reverse-flow check valve, refrigerant
charge base, vacuum gauge, and refrigerant recovery
equipment.).
If the refrigerant or the refrigerating machine oil left on
these tools are mixed in with R410A, it may cause the refrigerating machine oil to deteriorate.
Infiltration of water may cause the refrigerating machine
oil to deteriorate.
Gas leak detectors for conventional refrigerants will not
detect an R410A leak because R410A is free of chlorine.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of the refrigerant will change, and the unit may experience power loss.
Exercise special care when handling the tools for use
with R410A.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate.
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Before installing the unit
WARNING
Do not install the unit where a gas leak may occur.
If gaseous refrigerant leaks and piles up around the unit, it
may be ignited.
Do not use the unit to keep food items, animals, plants,
artifacts, or for other special purposes.
The unit is not designed to preserve food products.
Do not use the unit in an unusual environment.
Do not install the unit where a large amount of oil or steam
is present or where acidic or alkaline solutions or chemical
sprays are used frequently. Doing so may lead to a remarkable drop in performance, electric shock, malfunctions, smoke, and/or fire.
The presence of organic solvents or corrosive gas (i.e.
ammonia, sulfur compounds, and acid) may cause gas
leakage or water leakage.
When installing the unit in a hospital, take appropriate
measures to reduce noise interference.
High-frequency medical equipment may interfere with the
normal operation of the air conditioner or vice versa.
Do not install the unit on or over things that cannot get
wet.
When the humidity level exceeds 80% or if the drainage
system is clogged, the indoor unit may drip water. Drain water is also discharged from the outdoor unit. Install a centralized drainage system if necessary.
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Before installing the unit (moving and reinstalling the unit) and performing
electrical work
CAUTION
Properly ground the unit.
Do not connect the grounding wire to a gas pipe, water pipe,
lightning rod, or grounding wire from a telephone pole. Improper grounding may result in electric shock, smoke, fire,
and/or malfunction due to noise interference.
Do not put tension on the power supply wires.
If tension is put on the wires, they may break and result in
excessive heat, smoke, and/or fire.
Install an earth leakage breaker to avoid the risk of
electric shock.
Failure to install an earth leakage breaker may result in
electric shock, smoke, and/or fire.
Use the kind of power supply wires that are specified
in the installation manual.
The use of wrong kind of power supply wires may result in
current leak, electric shock, and/or fire.
Use breakers and fuses (current breaker, remote
switch <switch + Type-B fuse>, moulded case circuit
breaker) with the proper current capacity.
The use of wrong capacity fuses, steel wires, or copper
wires may result in malfunctions, smoke, and/or fire.
Do not spray water on the air conditioner or immerse
the air conditioner in water.
Otherwise, electric shock and/or fire may result.
When handling units, always wear protective gloves to
protect your hands from metal parts and high-temperature parts.
Periodically check the installation base for damage.
If the unit is left on a damaged platform, it may fall and
cause injury.
Properly install the drain pipes according to the instructions in the installation manual. Keep them insulated to avoid dew condensation.
Improper plumbing work may result in water leakage and
damage to the furnishings.
Exercise caution when transporting products.
Products weighing more than 20 kg should not be carried
alone.
Do not carry the product by the PP bands that are used on
some products.
Do not touch the heat exchanger fins. They are sharp and
dangerous.
When lifting the unit with a crane, secure all four corners
to prevent the unit from falling.
Properly dispose of the packing materials.
Nails and wood pieces in the package may pose a risk of
injury.
Plastic bags may pose a risk of choking hazard to chil-
dren. Tear plastic bags into pieces before disposing of
them.
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Before the test run
CAUTION
Turn on the unit at least 12 hours before the test run.
Keep the unit turned on throughout the season. If the unit is
turned off in the middle of a se ason, it may result in malfu nctions.
To avoid the risk of electric shock or malfunction of the
unit, do not operate switches with wet hands.
Do not touch the refrigerant pipes with bare hands during and immediately after operation.
During or immediately after operation, certain parts of the
unit such as pipes and compressor may be either very cold
or hot, depending on the state of the refrigerant in the unit
at the time. To reduce the risk of frost bites and burns, do
not touch these parts with bare hands.
Do not operate the unit without panels and safety
guards.
Rotating, high-temperature, or high-voltage parts on the unit
pose a risk of burns and/or electric shock.
Do not turn off the power immediately after stopping
the operation.
Keep the unit on for at least five minutes before turning off
the power to prevent water leakage or malfunction.
Do not operate the unit without the air filter.
Dust particles may build up in the system and cause malfunctions.
CONTENTS
HWE10140 GB
I Read Before Servicing
[1] Read Before Servicing.............................................................................................................. 3
[2] Necessary Tools and Materials ................................................................................................ 4
[3] Storage of Piping................................ ... ... ... .... ... ... ............................................. .... ... ............... 5
[4] Pipe Processing.................................. ... ... ............................................. .... ... ... ... ...................... 5
[5] Brazing......................... .................................................................................... ... .... .................. 6
[6] Air Tightness Test............................ ... ... ... ... .... ... ... ............................................. ...................... 7
[7] Vacuum Drying (Evacuation)....................................................................................................8
[8] Refrigerant Charging ..............................................................................................................10
[9] Remedies to be taken in case of a Refrigerant Leak....................................... ... .... ... ... ... ... .... 10
[10] Characteristics of the Conventional and the New Refrigerants ............................................ 11
[11] Notes on Refrigerating Machine Oil...................................................................................... 12
II Restrictions
[1] System configuration.......................... ... ................................................................................. 15
[2] Types and Maximum allowable Length of Cables ..................................................................16
[3] Switch Settings and Address Settings.................................................................................... 22
[4] Sample System Connection ...................................................... ... ... ... ... ................................. 28
[5] An Example of a System to which an MA Remote Controller is connected ...........................30
[6] An Example of a System to which an ME Remote Controller is connected ...........................42
[7] An Example of a System to which both MA Remote Controller and
ME Remote Controller are connected .................................................................................... 44
[8] Restrictions on Pipe Length...................................... .... ... ... ... .... ... ... ... .................................... 47
III Outdoor Unit Components
[1] Outdoor Unit Components and Refrigerant Circuit................................................................. 57
[2] Control Box of the Outdoor Unit..............................................................................................59
[3] Outdoor Unit Circuit Board......................................................................................................60
[4] BC Controller Components........................................................................ ... ... ... .... ................ 65
[5] Control Box of the BC Controller ............................................................................................68
[6] BC Controller Circuit Board .......................................................... ... ... ... .... ... ... ... .................... 69
IV Remote Controller
[1] Functions and Specifications of MA and ME Remote Controllers .......................................... 73
[2] Group Settings and Interlock Settings via the ME Remote Controller.................................... 74
[3] Interlock Settings via the MA Remote Controller.................................................................... 78
[4] Using the built-in Temperature Sensor on the Remote Controller.......................................... 79
V Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the Outdoor Unit........................................................................ 83
[2] Electrical Wiring Diagram of the BC Controller.......................................................................84
[3] Electrical Wiring Diagram of Transmission Booster................................................................ 93
VI Refrigerant Circuit
[1] Refrigerant Circuit Diagram .................................................................................................... 97
[2] Principal Parts and Functions... ... .... ... ... ... ............................................. .... ... ... ... .... ... ... ... ... .. 101
VII Control
[1] Functions and Factory Settings of the Dipswitches.............................................................. 111
[2] Controlling the Outdoor Unit ................................................................................................. 117
[3] Controlling BC Controller......................................................................................................128
[4] Operation Flow Chart............................................................................................................129
VIII Test Run Mode
[1] Items to be checked before a Test Run................................................................................137
[2] Test Run Method ..................................................................................................................138
[3] Operating Characteristic and Refrigerant Amount................................................................ 139
[4] Adjusting the Refrigerant Amount......................................................................................... 139
[5] Refrigerant Amount Adjust Mode.......................................................................................... 142
[6] The following symptoms are normal..................................................................................... 144
[7] Standard Operation Data (Reference Data)......................................................................... 145
CONTENTS
HWE10140 GB
IX Troubleshooting
[1] Error Code Lists............................................................................ ... ... ... .... ........................... 151
[2] Responding to Error Display on the Remote Controller........................................................ 154
[3] Investigation of Transmission Wave Shape/Noise ............................................................... 226
[4] Troubleshooting Principal Parts............................................................................................ 229
[5] Refrigerant Leak.............................. ... ............................................. ... ... .... ... ... ..................... 260
[6] Compressor Replacement Instructions......................................................... ... ... .... ... ... ........ 262
[7] Servicing the BC controller ................................................................................................... 269
[8] Troubleshooting Using the Outdoor Unit LED Error Display.................. .... ... ... ... .... ... ... ... ... .. 272
X LED Monitor Display on the Outdoor Unit Board
[1] How to Read the LED on the Service Monitor...................................................................... 275
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I Read Before Servicing
[1] Read Before Servicing................. ... ... ... .... ... ... ... ... .... ... ............................................. ... ......3
[2] Necessary Tools and Materials..........................................................................................4
[3] Storage of Piping ........ .... ... ... ... .... ... ... .......................................... ... .... ... ... ... ... .... ... ............5
[4] Pipe Processing................. ... ... .... ... ... ............................................. .... ...............................5
[5] Brazing...............................................................................................................................6
[6] Air Tightness Test..............................................................................................................7
[7] Vacuum Drying (Evacuation).............................................................................................8
[8] Refrigerant Charging........................................................................................................10
[9] Remedies to be taken in case of a Refrigerant Leak.......................................................10
[10] Characteristics of the Conventional and the New Refrigerants .......................................11
[11] Notes on Refrigerating Machine Oil.................................................................................12
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HWE10140 GB
I Read Before Servicing
[1] Read Before Servicing
1. Check the type of refrigerant used in the system to be serviced.
Refrigerant Type
Multi air conditioner for building application REPLACE MULTI YJM-B series R410A
2. Check the symptoms exhibited by the unit to be serviced.
Refer to this service handbook for symptoms relating to the refrigerant cycle.
3. Thoroughly read the safety precautions at the beginning of this manual.
4. Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant.
Refer to the manuals that came the tools for the correct usage.
5. Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be moved or replaced.
Use refrigerant piping made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the new pipes and the
end of the existing pipes clean and free of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and moisture.
These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate.
6. If there is a leak of gaseous refrigerant and the remaining refrigerant is exposed to an open flame, a poisonous gas
hydrofluoric acid may form. Keep workplace well ventilated.
CAUTION
Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
The use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.
[ I Read Before Servicing ]
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HWE10140 GB
[2] Necessary Tools and Materials
Prepare the following tools and materials necessary for installing and servicing the un it.
Tools for use with R410A (Adaptability of tools that are for use with R22 or R40 7C)
1. To be used exclusively with R410A (not to be used if used with R22 or R407C)
2. Tools and materials that may be used with R410A with some restrictions
3. Tools and materials that are used with R22 or R407C that may also be used with R410A
4. Tools and materials that must not be used with R410A
Tools for R410A must be handled with special care to keep moisture and dust from infiltrating the cycle.
Tools/Materials Use Notes
Gauge Manifold Evacuation and refrigerant charging Higher than 5.09MPa[738psi] on the
high-pressure side
Charging Hose Evacuation and refrigerant charging The hose diameter is larger than the
conventional model.
Refrigerant Recovery Cylinder Refrigerant recovery
Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The
cylinder is pink.
Charging Port on the Refrigerant Cylinder Refrigerant charging The charge port diameter is larger
than that of the current port.
Flare Nut Connection of the unit with the pipes Use Type-2 Flare nuts.
Tools/Materials Use Notes
Gas Leak Detector Gas leak detection The ones for use with HFC refrigerant
may be used.
Vacuum Pump Vacuum drying May be used if a check valve adapter
is attached.
Flare Tool Flare processing Flare processing dimensions for the
piping in the system using the new re-
frigerant differ from those of R22.
Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with
R410A.
Tools/Materials Use Notes
Vacuum Pump with a Check Valve Vacuum drying
Bender Bending pipes
Torque Wrench Tightening flare nuts Only the flare processing dimensions
for pipes that have a diameter of
ø12.70 (1/2") and ø15.88 (5/8") have
been changed.
Pipe Cutter Cutting pipes
Welder and Nitrogen Cylinder Welding pipes
Refrigerant Charging Meter Refrigerant charging
Vacuum Gauge Vacuum level check
Tools/Materials Use Notes
Charging Cylinder Refrigerant charging Prohibited to use
[ I Read Before Servicing ]
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HWE10140 GB
[3] Storage of Piping
1. Storage location
Store the piping materials indoors until they are ready to be installed (e.g., storage room on site or at the installer's premise).
If left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe, resulting in malfunctions.
2. Sealing the pipe ends
Both ends of the pipes should be sealed until just before brazing.
Keep elbows and T-joints wrapped in plastic bags to keep dust, dirt, and moisture out.
The new refrigerant oil is more than ten times as hygroscopic as the conventional refrigerant oil, such as Suniso, and is more
likely to introduce moisture into the system. To prevent the deterioration of refrigerant oil and resultant compressor failure,
store piping materials with special care to keep moisture out.
[4] Pipe Processing
Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Use a minimum amount of oil.
Use only ester oil, ether oil, and alkylbenzene.
[ I Read Before Servicing ]
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HWE10140 GB
[5] Brazing
No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide
scale, water, and dust) out of the refrigerant system.
Example: Inside the brazed connection
1. Items to be strictly observed
Do not conduct refrigerant piping work outdoors if raining.
Use non-oxidized solder.
Use a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and
copper coupling.
If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
Refrigerant oil for use with R410A is more than ten times as hygroscopic as the conventional refrigerant oil and is more likely
to introduce moisture into the system, requiring special care in handling to prevent malfunctions.
Do not use flux, which usually contains chloride and form sludge in the refrigerant circuit.
3. Notes
Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.
Use of oxidized solder for brazing Use of non-oxidized solder for brazing
[ I Read Before Servicing ]
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HWE10140 GB
[6] Air Tightness Test
No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak.
1. Items to be strictly observed
Pressurize the system with nitrogen to the design pressure (REPLACE MULTI Y(PUHY-RP): 3.3 MPa [479 psi]; REPLACE
MULTI R2 (PURY-RP): 3.6 MPa [523 psi]), and check for refrigerant leakage. Take the temperature fluctuations into account
when measuring pressure.
Refrigerant R410A must be charged in its liquid state (vs. gaseous state).
2. Reasons
Oxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
Refrigerant R410A must be charged in its liquid state. If gaseous refrigerant in the cylinder is drawn out first, the composition
of the remaining refrigerant in the cylinder will change and become unsuitable for use.
3. Notes
R410A does not contain chloride, so leak detectors for use with older types of refrigerants will not detect an R410A leak. Be
sure to use a leak detector designed for use with R410A.
Halide torch R22 leakage detector
[ I Read Before Servicing ]
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HWE10140 GB
[7] Vacuum Drying (Evacuation)
1. Vacuum pump with a reverse-flow check valve (Photo1)
To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum
pump with a reverse-flow check valve.
A reverse-flow check valve may also be added to the vacuum pump currently in use.
2. Standard of vacuum degree (Photo 2)
Use a vacuum pump that attains 0.5Torr(65Pa) or lower degree of vacuum after 5 minutes of operation, and connect it directly
to the vacuum gauge. Use a pump well-maintained with an appropriate lubricant. A poorly maintained vacuum pump may not
be able to attain the desired degree of vacuum.
3. Required precision of vacuum gauge
Use a vacuum gauge that registers a vacuum degree of 5Torr(650Pa) and measures at intervals of 1Torr(130Pa). (A recommended vacuum gauge is shown in Photo2.)
Do not use a commonly used gauge manifold because it cannot register a vacuum degree of 5Torr(650Pa).
4. Evacuation time
After the degree of vacuum has reached 5Torr(650Pa), evacuate for an additional 1 hour. (A thorough vacuum drying re-
moves moisture in the pipes.)
Verify that the vacuum degree has not risen by more than 1Torr(130Pa) 1hour after evacuation. A rise by less than
1Torr(130Pa) is acceptable.
If the vacuum is lost by more than 1Torr(130Pa), conduct evacuation, following the instructions in section 6. Special vacuum
drying.
5. Procedures for stopping vacuum pump
To prevent the reverse flow of vacuum pump oil, open the relief valve on the vacuum pump side, or draw in air by loosening
the charge hose, and then stop the operation.
The same procedures should be followed when stopping a vacuum pump with a reverse-flow check valve.
6. Special vacuum drying
When 5Torr(650Pa) or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has pen-
etrated the system or that there is a leak.
If water infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to
0.5kgf/cm
2
G(0.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree of vac-
uum below 5Torr(650Pa) is attained or until the pressure stops rising.
Only use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)
(Photo1) 15010H (Photo2) 14010
Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge
[ I Read Before Servicing ]
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HWE10140 GB
7. Notes
To evacuate air from the entire system
Applying a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1
and 2) is not enough to attain the desired vacuum pressure.
Be sure to apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure
sides (BV1 and 2) and also through the check joints on the high and low pressure sides (CJ1 and 2).
To evacuate air only from the outdoor units
Apply a vacuum through the check joints on the high and low pressure sides (CJ1, and 2).
To evacuate air from the indoor units and exte ns ion pipes
Apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1
and 2).
[ I Read Before Servicing ]
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HWE10140 GB
[8] Refrigerant Charging
1. Reasons
R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be han dled
the same way as a single refrigerant, such as R22. To be safe, however, draw out the refrigerant from the cylinder in the liquid
phase. If the refrigerant in the gaseous phase is drawn out, the composition of the remaining refrigeran t will change and become unsuitable for use.
2. Notes
When using a cylinder with a siphon, refrigerant is charged in the liquid state without the need for turning it upside down. Check
the type of the cylinder on the label before use.
[9] Remedies to be taken in case of a Refrigerant Leak
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced. (Charge refrigerant in the
liquid state.)
Refer to "IX [5] Refrigerant Leak."(page 260)
Cylinder with a siphon
Cylinder color R410A is pink. Refrigerant charging in the liquid state
Cylinder
liquid
Valve Valve
liquid
Cylinder
Cylinder without a siphon
[ I Read Before Servicing ]
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HWE10140 GB
[10] Characteristics of the Conventional and the New Refrigerants
1. Chemical property
As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant.
However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will
accumulate at the bottom of the room and may cause hypoxia.
If exposed to an open flame, refrigerant will generate poisonous gases. Do not perform installation or service work in a confined area.
*1 When CFC11 is used as a reference
*2 When CO
2
is used as a reference
2. Refrigerant composition
R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To
be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn
out, the composition of the remaining refrigerant will change and become unsuitable for use.
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced.
3. Pressure characteristics
The pressure in the system using R410A is 1.6 times as great as that in the system using R22.
New Refrigerant (HFC type) Conventional Refriger-
ant (HCFC type)
R410A R407C R22
R32/R125 R32/R125/R134a R22
Composition (wt%) (50/50) (23/25/52) (100)
Type of Refrigerant Pseudo-azeotropic
Refrigerant
Non-azeotropic
Refrigerant
Single Refrigerant
Chloride Not included Not included Included
Safety Class A1/A1 A1/A1 A1
Molecular Weight 72.6 86.2 86.5
Boiling Point (°C/°F) -51.4/-60.5 -43.6/-46.4 -40.8/-41.4
Steam Pressure
(25°C,MPa/77°F,psi) (gauge)
1.557/226 0.9177/133 0.94/136
Saturated Steam Density
(25°C,kg/m
3
/77°F,psi)
64.0 42.5 44.4
Flammability Nonflammable Nonflammable Nonflammable
Ozone Depletion Coefficient (ODP)
*1
0 0 0.055
Global Warming Coefficient (GWP)
*2
1730 1530 1700
Refrigerant Charging Method Refrigerant charging in
the liquid state
Refrigerant charging in
the liquid state
Refrigerant charging in
the gaseous state
Replenishment of Refrigerant after a Refrigerant
Leak
Available Available Available
Temperature (°C/°F)
Pressure (gauge)
R410A R407C R22
MPa/psi MPa/psi MPa/psi
-20/-4 0.30/44 0.18/26 0.14/20
0/32 0.70/102 0.47/68 0.40/58
20/68 1.34/194 0.94/136 0.81/117
40/104 2.31/335 1.44/209 1.44/209
60/140 3.73/541 2.44/354 2.33/338
65/149 4.17/605 2.75/399 2.60/377
[ I Read Before Servicing ]
- 12 -
HWE10140 GB
[11] Notes on Refrigerating Machine Oil
1. Refrigerating machine oil in the HFC refrigerant system
HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system.
Note that the ester oil used in the system has properties that are different from commercially available ester oil.
2. Effects of contaminants
*1
Refrigerating machine oil used in the HFC system must be handled with special care to keep contaminants out.
The table below shows the effect of contaminants in the refrigerating machine oil on the refrigeration cycle.
3. The effects of contaminants in the refrigerating machine oil on the refrigeration cycle.
Refrigerant Refrigerating machine oil
R22 Mineral oil
R407C Ester oil
R410A Ester oil
*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.
Cause Symptoms Effects on the refrigerant cycle
Water infiltration Frozen expansion valve
and capillary tubes
Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Motor insulation failure
Burnt motor
Coppering of the orbiting scroll
Lock
Burn-in on the orbiting scroll
Hydrolysis
Sludge formation and adhesion
Acid generation
Oxidization
Oil degradation
Air infiltration Oxid ization
Infiltration of
contaminants
Dust, dirt
Adhesion to expansion valve and capillary
tubes
Clogged expansion valve, capillary tubes, and
drier
Poor cooling performance
Compressor overheat
Infiltration of contaminants into the compressor
Burn-in on the orbiting scroll
Mineral oil
etc.
Sludge formation and adhesion Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Oil degradation Burn-in on the orbiting scroll
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HWE10140 GB
II Restrictions
[1] System configuration .......................................................................................................15
[2] Types and Maximum allowable Length of Cables ...........................................................16
[3] Switch Settings and Address Settings.............................................................................22
[4] Sample System Connection.............................................................................................28
[5] An Example of a System to which an MA Remote Controller is connected.....................30
[6] An Example of a System to which an ME Remote Controller is connected.....................42
[7] An Example of a System to which both MA Remote Controller and
ME Remote Controller are connected..............................................................................44
[8] Restrictions on Pipe Length.............................................................................................47
- 14 -
[ II Restrictions ]
- 15 -
HWE10140 GB
II Restrictions
[1] System configuration
1. Table of compatible indoor units
The table below summarizes the types of indoor units that are compa ti ble with different types of outdoor units.
(1) Standard combinations
1) "Maximum total capacity of connectable indoor units" refers to the sum of the numeric values in the indoor unit model names.
2) If the total capacity of the indoor units that are connected to a given outdoor unit exceeds the capacity of the outdoor unit, the
indoor units will not be able to perform at the rated capacity when they are operated simultaneously. Select a combination of
units so that the total capacity of the connected indoor units is at or below the capacity of the outdoor unit whenever possible.
Outdoor
units
Composing units Maximum total capacity
of connectable indoor
units
Maximum number
of connectable in-
door units
Types of connectable in-
door units
P200 - - 100 - 300 20 P15 - P250 models
R410A series indoor units
P250 - - 125 - 375 25
P300 - - 150 - 450 30
[ II Restrictions ]
- 16 -
HWE10140 GB
[2] Types and Maximum allowable Length of Cables
1. Wiring work
(1) Notes
1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this manual.
2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference.
(Do not put the control cable and power supply cable in the same conduit tube.)
3) Provide grounding for the outdoor unit as required.
4) Run the cable from the electric box of the indoor or outdoor unit in such way that the box is accessible for servicing.
5) Do not connect power supply wiring to the terminal block for transmission line. Doing so will damage the electronic components on the terminal block.
6) Use 2-core shielded cables as transmission cables.
Use a separate 2-core control cable for each refrigerant system. Do not use a single multiple-core cable to connect indoor
units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and
malfunctions.
(2) Control wiring
Different types of control wiring are used for different systems.
Refer to section "[5] An Example of a System to which an MA Remote Controller is connected - [7] An Example of a System
to which both MA Remote Controller and ME Remote Controller are connected" before performi ng wiring work.
Types and maximum allowable length of cables
Control lines are categorized into 2 types: transmission line and remote controller line.
Use the appropriate type of cables and observe the maximum allowable length specified for a given system. If a given system
has a long transmission line or if a noise source is located near the unit, place the unit away from the noise source to reduce
noise interference.
1) M-NET transmission line
Cable type
Facility
type
All facility types
Type Shielded cable CVVS, CPEVS, MVVS*1
Number of
cores
2-core cable
Cable size Larger than 1.25mm
2
[AWG16]
Maximum transmission
line distance between the
outdoor unit and the farthest indoor unit
200 m [656ft] max.
Maximum transmission
line distance for centralized control and Indoor/
outdoor transmission line
(Maximum line distance
via outdoor unit)
500 m [1640ft] max.
*The maximum overall line length from the power supply unit on the transmission lines for
centralized control to each outdoor unit or to the system controller is 200m [656ft] max.
*1 If unshielded cables are used, consult your dealer.
TB3TB
7
TB3TB
7
TB3TB
7
TB3TB
7
TB3: Terminal block for indoor-outdoor transmission line TB7: Terminal block for centralized control
multiple-core cable
BC Controller
Indoor unit
Remote Controller
Remote Controller
2-core shielded cable
2-core shielded cable
Outdoor unit
BC Controller
Indoor unit
Outdoor unit
[ II Restrictions ]
- 17 -
HWE10140 GB
2) Remote controller wiring
*1 MA remote controller refers to MA remote controller (PAR-20MAA, PAR-21MAA), MA simple remote controller, and
wireless remote controller.
*2 ME remote controller refers to ME remote controller and ME simple remote controller.
*3 The use of cables that are smaller than 0.75mm
2
[AWG18] is recommended for easy handling.
*4 When connected to the terminal block on the Simple remote controller, use cabl es that meet the cable size specifi-
cations shown in the parenthesis.
MA remote controller
*1
ME remote controller
*2
Cable type
Type VCTF, VCTFK, CVV, CVS, VVR, VVF, VCT Shielded cable MVVS
Number of
cores
2-core cable 2-core cable
Cable size
0.3 to 1.25mm
2 *3
[AWG22 to 16]
(0.75 to 1.25mm2 )
*4
[AWG18 to 16]
0.3 to 1.25mm
2 *3
[AWG22 to 16]
(0.75 to 1.25mm2 )
*4
[AWG18 to 16]
Maximum overall line
length
200 m [656ft] max.
The section of the cable that exceeds 10m
[32ft] must be included in the maximum indoor-outdoor transmission line distance.
[ II Restrictions ]
- 18 -
HWE10140 GB
(3) Reusability check of the existing transmission lines for Replace Multi units
Check the existing wires for damage to insulation by measuring the resistance between the lead and the
ground with a 500 V ohmmeter. If the insulation resistance is less than 100 MΩ, replace the wires.
Check items Notes
1. Remote controller cable (MA remote controller)
(1) Length
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
2. Remote controller cable (ME remote controller)
(1) Length *1
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
3. Remote controller cable (system controller)
(1) Length *1
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
4. Indoor-outdoor transmission line
(1) Refrigerant system (Single/Multiple)
(2) Length of transmission line to the farthest unit *1
(3) Cable size
(4) Number of cores
(5) Cable type (shielded/unshielded)
(6) Number of connected indoor units
5. Centralized control transmission line
(1) Length of transmission line to the farthest unit *1
(2) Cable size
(3) Number of cores
(4) Cable type (shielded/unshielded)
7. Noise-related problems with the old units
Existing transmission lines reusability checklist
Obtain the system configuration drawing, fill out the checklist, and make a decision based on them.
Use the flowcharts on the following pages to determine the reusability of the existing transmission lines.
*1: If the remote controller (ME/System controller) length exceeds 10 m, include the exceeded length in the calculation of the
transmission line length (indoor-outdoor transmission line/centralized control system).
(5) System controller connection (Indoor unit
system/centralized control system)
6. Availability of system configuration drawing (Obtain one as
much as possible.)
8. Are there any high-frequency medical equipment in the adjacent
area that could cause noise-interference?
(Write down the nature of the problem in the “Notes” column,
if any.)
(Write down the specific nature of the concerns in the “Notes”
column, if any.)
Findings
Shielded/Unshielded
Shielded/Unshielded
Shielded/Unshielded
Indoor/Centralized
Single/Multiple
Shielded/Unshielded
Shielded/Unshielded
Available/Not available
Available/Not available
m
mm
2
m
mm
2
m
mm
2
m
mm
2
m
mm
2
Cores
Cores
Cores
Cores
units
Cores
Available/Not available
[ II Restrictions ]
- 19 -
HWE10140 GB
Table A
Is the 2-core cable used?
Is the 2-core cable used?
Is the 2-core cable used?
YES
NO
YES
NO
YES
YES YES
NO
YES
NO
YES
YES
YES
Reusability of MA remote controller wiring
Reusability of System controller wiring
Reusability of M-NET remote controller witing
NO
Is the wiring length
less than 200m?
Is the wiring of
less than 10m?
Refer to Table A.
Handle the non-using wiring as
shown in figure A.
NO
Please contact MITSUBISHI
ELECTRIC.
NO
Please contact MITSUBISHI
ELECTRIC.
NO
Please contact MITSUBISHI
ELECTRIC.
Refer to Table A.
Handle the non-using wiring as
shown in figure A.
Refer to Table A.
Handle the non-using wiring as
shown in figure A.
If the wiring is more than 10m, include the
exceeding length to the total wiring length.
When 10m is exceeded, use the shielded
cable for exceeding length.
If the wiring is more than 10m, include the
exceeding length to the total wiring length.
When 10m is exceeded, use the shielded
cable for exceeding length.
Make wiring length less than
200m.
Is the shielded
wiring used?
Is the shielded
wiring used?
Is the shielded
wiring used?
Go to "Reusability of
Transmission line".
Go to "Reusability of
Transmission line".
Go to "Reusability of
Transmission line".
shielded wire
Ａ
Ｂ
Ｓ
Ａ
Ｂ
Ｓ
Figure A. Non-using wiring
Side:
Close to power supply unit
(Outdoor unit, Power supply unit)
Non using wiring on the power supply side (Outdoor unit, Power supply
unit) should be connected to the shield terminal. The non-using wiring on
the opposite side should be open and insulated.
Type of cable
Cable size
Remarks
Sheathed 2-core cable (unshielded)
CVV
2
Shielding wire (2-core)
CVVS, CPEVS or MVVS
Transmission cables ME Remote controller cables
CVVS, MVVS : PVC insulated PVC jacketed shielded control cable
CPEVS : PE insulated PVC jacketed shielded communication cable
Connected with simple remote controller.
CVV : PV insulated PVC sheathed control cable
—
Max length : 200m [656ft]
(Li)
MA Remote controller cables
When 10m [32ft] is exceeded, use the
shielded cable for exceeding length.
More than 1.25 [AWG16]
2
0.3 1.25 [AWG22 16]
(0.75 1.25 [AWG18 16])
2
2
0.3 1.25 [AWG22 16]
(0.75 1.25 [AWG18 16])
[ II Restrictions ]
- 20 -
HWE10140 GB
Reusability of Transmission line
Is the 2-core cable used?
Is the shielded wiring used?
Refer to Table A.
Fix the ground fault current.
Less than 200m More than 0.5mm
2
Less than 130m More than 0.3mm
2
Wiring diameter
Chart A. Centralized transmission line applicable diameter
YES
YES
NO
Please contact MITSUBISHI
ELECTRIC.
NO
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
NO
Is the current in
normal state without
ground fault?
Is the farthest
transmission line between OU and
IU less than 200m?
Farthest transmission line of
centralized controller must be less
than 200m.
To find out the reusability, check the number
of indoor units, farthest length of
transmission line, and read the applicable
diameter from diagram B.
Handle the wiring that are not used
as shown in figure A.
Farthest transmission line for
centralized control system must be
less than 500m.
Is the farthest
transmission line of centralized
control system less
than 500m?
Does the diameter of the
transmission line match the
figures in Table A?
Length between power
supply unit to outdoor unit
and system controller
Shielded wiring should be connected
to the terminal at the power supply
unit side (outdoor unit).
Is the system stand-alone?
Existing transmission line can
be reused.
ࠛ
Is the diameter of
the current wiring thicker
than the diameter read
from chart A?
Change the centralized
transmission line
diameter to more than
1.25mm
2
.
[ II Restrictions ]
- 21 -
HWE10140 GB
0
50
100
150
200
0 5 10 15 20 25 32
30
Number of indoor units
Length of transmission line to the farthest unit (m)
0.75mm
2
0.5mm
2
MA remote controller
Diagram B Checking the cable size
0.3mm
2
1.25mm
2
M-NET remote controller
Number of indoor units
Length of transmission line to the farthest unit (m)
0.5mm
2
0.75mm
2
0.3mm
2
1.25mm
2
0
50
100
150
200
0 5 10 15 20
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