Mitsubishi PUHY-EP200, PUHY-EP300, PUHY-EP450YKM-A, PUHY-EP450YSKM-A, PUHY-EP500 Service Handbook
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Safety Precautions
Please read the following safety precautions carefully before installing the unit to ensure safety.
Indicates a risk of death or serious injury.
Indicates a risk of serious injury or structural damage.
Make sure that this manual is passed on to the end user to retain for future reference.
Retain this manual for future reference. When the unit is reinstalled or repaired, have this manual available to those who pro-
vide these services. Make sure that this manual is passed on to any future users.
All electric work must be performed by qualified personnel.
Air tightness test must be performed by qualified personnel.
[1] General Precautions
General Precautions
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.
Do not install the unit in a place where large
amounts of oil, steam, organic solvents, or
corrosive gases, such as sulfuric gas, are
present or where acidic/alkaline solutions
or sprays containing sulfur are used frequently. These substances can compromise the performance of the unit or cause
certain components of the unit to corrode,
which can result in refrigerant leakage, water leakage, injury, electric shock, malfunctions, smoke, or fire.
Do not try to defeat the safety features of the
unit or make unauthorized setting changes.
Forcing the unit to operate the unit by defeating the safety features of the devices
such as the pressure switch or the temperature switch, making unauthorized changes
to the switch settings, or using accessories
other than the ones recommended by Mitsubishi Electric may result in smoke, fire, or
explosion.
To reduce the risk of shorting, current leakage, electric shock, malfunctions, smoke, or
fire, do not splash water on electric parts.
To reduce the risk of electric shock, malfunctions, smoke or fire, do not operate the
switches/buttons or touch other electrical
parts with wet hands.
To reduce the risk of pipe burst and explosion, do not allow gas refrigerant and refrigerant oil to be trapped in the refrigerant
circuit.
To reduce the risk of burns or frost bites, do
not touch the refrigerant pipes or refrigerant
circuit components with bare hands during
and immediately after operation.
To reduce the risk of burns, do not touch
any electrical parts with bare hands during
or immediately after stopping operation.
To reduce the risk of injury from falling
tools, keep children away while installing,
inspecting, or repairing the unit.
Keep the space well ventilated. Refrigerant
can displace air and cause oxygen starvation. If leaked refrigerant comes in contact
with a heat source, toxic gas may be generated.
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Always replace a fuse with one with the correct current rating. The use of improperly
rated fuses or a substitution of fuses with
steel or copper wire may result in bursting,
fire or explosion.
To reduce the risk of electric shock, smoke,
and fire due to infiltration of dust and water,
properly install all required covers and panels on the terminal box and control box.
To reduce the risk of injury from units falling
or falling over, periodically check the installation base for damage.
Consult an authorized agency for the proper
disposal of the unit. Refrigerant oil and refrigerant that may be left in the unit pose a
risk of fire, explosion, or environmental pollution.
To reduce the risk of being caught in rotating parts, electric shock, and burns, do not
operate the unit without all required panels
and guards being installed.
To reduce the risk of injury, do not sit,
stand, or place objects on the unit.
To reduce the risk of water leakage and malfunctions, do not turn off the power immediately after stopping operation. Leave the
unit turned on for at least 5 minutes before
turning off the power.
Do not install the unit over things that are
vulnerable to water damage from condensation dripping.
To reduce the risk of injury, electric shock,
and malfunctions, do not touch or allow cables to come in contact with the edges of
components.
To reduce the risk of injury, do not touch the
heat exchanger fins or sharp edges of components with bare hands.
[2] Transportation and Installation
Always wear protective gears when touching electrical components on the unit. Several minutes after the power is switched off,
residual voltage may still cause electric
shock.
To reduce the risk of electric shock and
burns, always wear protective gear when
working on units.
To reduce the risk of injury, do not insert fingers or foreign objects into air inlet/outlet
grills. If the unit is left on a damaged base, it
may fall and cause injury.
To reduce the risk of injury, always wear
protective gear when working on units.
Do not release refrigerant into the atmosphere. Collect and reuse the refrigerant, or
have it properly disposed of by an authorized agency. Refrigerant poses environmental hazards if released into the air.
Transportation and Installation
Lift the unit by placing the slings at designated locations. Support the outdoor unit
securely at four points to keep it from slipping and sliding. If the unit is not properly
supported, it may fall and cause personal
injury.
To reduce the risk of injury, do not carry the
product by the PP bands that are used on
some packages.
To reduce the risk of injury, products weighing 20 kg or more should be carried by two
or more people.
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[3] Installation
Installation
Do not install the unit where there is a risk
of leaking flammable gas.
If flammable gas accumulates around the
unit, it may ignite and cause a fire or explosion.
To reduce the risk of injury from coming in
contact with units, install units where they
are not accessible to people other than
maintenance personnel.
To reduce the risk of injury, properly dispose of the packing materials so that children will not play with them.
Properly dispose of the packing materials.
Plastic bags pose suffocation hazard to
children.
All drainage work should be performed by
the dealer or qualified personnel according
to the instructions detailed in the Installation Manual. Improper drainage work may
cause water leakage and resultant damage
to the furnishings.
Remove packing materials from the unit before operating the unit. Note that some accessories may be taped to the unit. Properly
install all accessories that are required. Failing to remove the packing materials or failing to install required accessories may
result in refrigerant leakage, oxygen deprivation, smoke, or fire.
Consult your dealer and take appropriate
measures to safeguard against refrigerant
leakage and resultant oxygen starvation. An
installation of a refrigerant gas detector is
recommended.
Any additional parts must be installed by
the dealer or qualified personnel. Only use
the parts specified by Mitsubishi Electric.
Installation by unauthorized personnel or
use of unauthorized parts or accessories
may result in water leakage, electric shock,
or fire.
Take appropriate safety measures against
wind gusts and earthquakes to prevent the
unit from toppling over and causing injury.
Do not install the unit over things that are
vulnerable to water damage. Provide an adequate collective drainage system for the
drain water from unit as necessary.
To reduce the risk of damage to the unit and
resultant electric leak and electric shock,
keep small animals, snow, and rain water
from entering the unit by closing the gap in
the pipe and wire access holes.
[4] Piping Work
Piping Work
To reduce the risk of injury, including frost
bites, that may result from being blasted
with refrigerant, use caution when operating the refrigerant service valve. If refrigerant leaks out and comes in contact with an
open flame, toxic gases may be generated.
To reduce the risk of injury from units falling
or falling over, install the unit on a surface
that is strong enough to support its weight.
To reduce the risk of rain water or drain water from entering the room and damaging
the interior, drainage work must be performed by your dealer or qualified personnel according to the instructions detailed in
the Installation Manual.
To reduce the risk of refrigerant catching
fire and causing burns, remove the refrigerant gas and the residual refrigerant oil in the
pipes before heating them.
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To reduce the risk of pipe damage, refrigerant leakage, and oxygen deprivation, use
pipes that meet the pipe thickness specifications, which vary by the type of refrigerant used, pipe diameter, and pipe material.
To reduce the risk of pipe burst or explosion, evacuate the refrigerant circuit using a
vacuum pump, and do not purge the system
with refrigerant.
To reduce the risk of explosion and deterioration of refrigerant oil caused by chloride,
do not use oxygen, flammable gas, or refrigerant that contains chloride as a pressurizing gas.
To prevent explosion, do not heat the unit
with refrigerant gas in the refrigerant circuit.
To reduce the risk of oxygen deprivation
and gas poisoning, check for gas leakage
and keep fire sources away.
Insulate pipe connections after completing
the air tightness test. Performing an air
tightness test with the pipe being insulated
may lead to failure to detect refrigerant leakage and cause oxygen deprivation.
To reduce the risk of pipe damage and resultant refrigerant leakage and oxygen deprivation, keep the field-installed pipes out
of contact with the edges of components.
To reduce the risk of pipe bursting and explosion due to abnormal pressure rise, do
not allow any substances other than R410A
(such as air) to enter the refrigerant circuit.
[5] Wiring Work
Wiring Work
To reduce the risk of wire breakage, overheating, smoke, and fire, keep undue force
from being applied to the wires.
To reduce the risk of wire breakage, overheating, smoke, or fire, properly secure the
cables in place and provide adequate slack
in the cables so as not to stress the terminals.
All electric work must be performed by a
qualified electrician according to the local
regulations, standards, and the instructions
detailed in the Installation Manual. Capacity
shortage to the power supply circuit or improper installation may result in malfunction, electric shock, smoke, or fire.
To reduce the risk of electric shock, smoke,
or fire, install an inverter circuit breaker on
the power supply to each unit.
To keep the ceiling and floor from getting
wet due to condensation, properly insulate
the pipes.
Use properly rated breakers and fuses (inverter circuit breaker, local switch <switch +
fuse>, no-fuse breaker). The use of a breaker with a breaking capacity greater than the
specified capacity may cause electric
shock, malfunctions, smoke, or fire.
To reduce the risk of current leakage, overheating, smoke, or fire, use properly rated
cables with adequate current carrying capacity.
Proper grounding must be provided by a licensed electrician.
Do not connect the grounding wire to a gas
pipe, water pipe, lightning rod, or telephone
wire. Improper grounding may result in
electric shock, smoke, fire, or malfunction
due to electrical noise interference.
To reduce the risk of current leakage, wire
breakage, smoke, or fire, keep the wiring
out of contact with the refrigerant pipes and
other parts, especially sharp edges.
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[6] Relocation and Repairs
Relocation and Repairs
To reduce the risk of refrigerant leakage,
water leakage, injury, electric shock, and
fire, units should only be moved or repaired
by your dealer or qualified personnel.
To reduce the risk of wire shorting, electric
shock, malfunctions, or fire, keep circuit
boards dust free, and do not touch them
with your hands or tools.
[7] Additional Precautions
Additional Precautions
To avoid damage to the unit, use appropriate tools to install, inspect, or repair the
unit.
To reduce the risk or malfunction, turn on
the power at least 12 hours before starting
operation, and leave the power turned on
throughout the operating season.
Recover all refrigerant in the units, and dispose of it properly according to any applicable laws and regulations.
Provide a maintenance access to allow for
the inspection of pipes above the ceiling or
the buried pipes.
Take appropriate measures against electrical noise interference when installing the air
conditioners in hospitals or facilities with
radio communication capabilities. Inverter,
high-frequency medical, or wireless communication equipment as well as power
generators may cause the air conditioning
system to malfunction. Air conditioning
system may also adversely affect the operation of these types of equipment by creating
electrical noise.
To reduce the risk of damage to the unit,
leave the valves on the unit closed until refrigerant charging is completed.
Place a wet towel on the refrigerant service
valve before brazing the pipes to keep its
temperature from rising above 120ºC and
damaging the surrounding equipment.
To reduce the risk of wire shorting, electric
leak, electric shock, smoke, or fire, do not
perform maintenance work in the rain.
To reduce the risk of injury, electric shock,
and fire, properly reinstall all removed components after completing repair work.
To reduce the risk of refrigerant and water
leakage, check the pipe supports and insulation for damage during inspection or repair, and replace or repair the ones that are
found to be deteriorated.
Direct the blazing torch flame away from the
adjacent cables and sheet metal to keep
them from being overheated and damaged.
Prepare tools for exclusive use with R410A.
Do not use the following tools if they have
been used with the conventional refrigerant
(R22): gauge manifold, charging hose, refrigerant leak detector, check valve, refrigerant charge spout, vacuum gauge, and
refrigerant recovery equipment. R410A
does not contain chloride, so leak detectors
for use with older types of refrigerants will
not detect an R410A leak. Infiltration of the
residual refrigerant, refrigerant oil, or water
on these tools may cause the refrigerant oil
in the new system to deteriorate or damage
the compressor.
To reduce the risk of the vacuum pump oil
backflowing into the refrigerant cycle and
causing the refrigerant oil to deteriorate,
use a vacuum pump with a check valve.
Have a set of tools for exclusive use with
R410A. Consult your nearest Mitsubishi
Electric Dealer.
Keep dust, dirt, and water off charging hose
and flare tool. Infiltration of dust, dirt, or water into the refrigerant circuit may cause the
refrigerant oil to deteriorate or damage the
compressor.
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Use refrigerant piping and couplings that
meet the applicable standards. For refrigerant pipes, use pipes made of phosphorus
deoxidized copper. Keep the inner and outer surfaces of pipes and couplings clean
and free of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and
moisture. Failure to follow these directions
may result in the deterioration of refrigerant
oil or compressor damage.
Store the piping materials indoors, and
keep both ends of the pipes sealed until immediately before brazing. Keep elbows and
other joints in plastic bags. Infiltration of
dust, dirt, or water into the refrigerant circuit may cause the refrigerant oil to deteriorate or damage the compressor.
Apply ester oil, ether oil, or a small amount
of alkyl benzene to flares and flanges. The
use and accidental infiltration of mineral oil
into the system may cause the refrigerant
oil to deteriorate or damage the compressor.
To reduce the risk of both the breaker on the
product side and the upstream breaker from
tripping and causing problems, split the
power supply system or provide protection
coordination between the earth leakage
breaker and no-fuse breaker.
Have a backup system, if failure of the unit
has a potential for causing significant problems or damages.
To reduce the risk of oxidized film from entering the refrigerant pipe and causing the
refrigerant oil to deteriorate or damaging
the compressor, braze pipes under nitrogen
purge.
Do not use the existing refrigerant piping. A
large amount of chloride that is contained in
the residual refrigerant and refrigerant oil in
the existing piping may cause the refrigerant oil in the new unit to deteriorate or damage the compressor.
Charge refrigerant in the liquid state. If refrigerant is charged in the gas phase, the
composition of the refrigerant in the cylinder will change, compromising the unit's
performance.
Do not use a charging cylinder. The use of a
charging cylinder will change the composition of the refrigerant, compromising the
unit's performance.
Charge the system with an appropriate
amount of refrigerant in the liquid phase.
Refer to the relevant sections in the manuals to calculate the appropriate amount of
refrigerant to be charged. Refrigerant overcharge or undercharge may result in performance drop or abnormal stop of operation.
To reduce the risk of power capacity shortage, always use a dedicated power supply
circuit.
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CONTENTS
Chapter 1 Piping Work
1-1 Preparation for Piping Work..................................................................................................................3
1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil .......................5
1-3 Working with Refrigerant Piping......................................................................................................... 10
Chapter 2 Restrictions
2-1 System Configurations ........................................................................................................................ 17
2-2 Types and Maximum Allowable Length of Cables ............................................................................ 18
2-3 Switch Settings..................................................................................................................................... 19
2-4 M-NET Address Settings ..................................................................................................................... 20
2-5 Demand Control Overview .................................................................................................................. 26
2-6 System Connection Example ..............................................................................................................28
2-7 Example System with an MA Remote Controller .............................................................................. 30
2-8 Example System with an ME Remote Controller............................................................................... 40
2-9 Example System with an MA and an ME Remote Controller............................................................42
2-10 Restrictions on Refrigerant Pipes ...................................................................................................... 44
Chapter 3 Major Components, Their Functions and Refrigerant Circuits
3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ................................. 51
3-2 Outdoor Unit Refrigerant Circuit Diagrams .......................................................................................56
3-3 Functions of the Major Components of Outdoor Unit ......................................................................57
3-4 Functions of the Major Components of Indoor Unit .........................................................................60
Chapter 4 Electrical Components and Wiring Diagrams
4-1 Outdoor Unit Circuit Board Arrangement .......................................................................................... 63
4-2 Outdoor Unit Circuit Board Components .......................................................................................... 65
4-3 Outdoor Unit Electrical Wiring Diagrams...........................................................................................71
4-4 Transmission Booster Electrical Wiring Diagrams........................................................................... 73
Chapter 5 Control
5-1 Dipswitch Functions and Factory Settings........................................................................................77
5-2 Outdoor Unit Control ...........................................................................................................................83
5-3 Operation Flowcharts ..........................................................................................................................96
Chapter 6 Test Run
6-1 Read before Test Run ........................................................................................................................ 103
6-2 MA and ME Remote Controller Functions and Specifications.......................................................104
6-3 Making the Group and Interlock Settings from an ME Remote Controller ................................... 105
6-4 Selecting Remote Controller Functions from an ME Remote Controller ...................................... 109
6-5 Making Interlock Settings from an MA Remote Controller.............................................................111
6-6 Changing the Room Temperature Detection Position.................................................................... 117
6-7 Test Run Method ................................................................................................................................ 118
6-8 Operation Characteristics and Refrigerant Charge ........................................................................121
6-9 Evaluating and Adjusting Refrigerant Charge.................................................................................121
6-10 The Following Symptoms Are Normal .............................................................................................127
6-11 Standard Operation Data (Reference Data) ..................................................................................... 128
Chapter 7 Troubleshooting Using Error Codes
7-1 Error Code and Preliminary Error Code Lists .................................................................................145
7-2 Error Code Definitions and Solutions: Codes [0 - 999]................................................................... 148
7-3 Error Code Definitions and Solutions: Codes [1000 - 1999]........................................................... 149
7-4 Error Code Definitions and Solutions: Codes [2000 - 2999]........................................................... 153
7-5 Error Code Definitions and Solutions: Codes [3000 - 3999]........................................................... 159
7-6 Error Code Definitions and Solutions: Codes [4000 - 4999]........................................................... 160
7-7 Error Code Definitions and Solutions: Codes [5000 - 5999]........................................................... 173
7-8 Error Code Definitions and Solutions: Codes [6000 - 6999]........................................................... 180
7-9 Error Code Definitions and Solutions: Codes [7000 - 7999]........................................................... 196
HWE12050 GB
CONTENTS
Chapter 8 Troubleshooting Based on Observed Symptoms
8-1 MA Remote Controller Problems ......................................................................................................207
8-2 ME remote Controller Problems .......................................................................................................211
8-3 Refrigerant Control Problems ...........................................................................................................215
8-4 Checking Transmission Waveform and for Electrical Noise Interference .................................... 220
8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ........ 223
8-6 Troubleshooting Solenoid Valve Problems.....................................................................................225
8-7 Troubleshooting Outdoor Unit Fan Problems .................................................................................227
8-8 Troubleshooting LEV Problems........................................................................................................ 228
8-9 Troubleshooting Inverter Problems .................................................................................................234
8-10 Control Circuit .................................................................................................................................... 243
8-11 Measures for Refrigerant Leakage ...................................................................................................246
8-12 Compressor Replacement Instructions ........................................................................................... 248
8-13 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit..................... 250
Chapter 9 LED Status Indicators on the Outdoor Unit Circuit Board
9-1 LED Status Indicators ........................................................................................................................ 253
9-2 LED Status Indicators Table ............................................................................................................. 256
HWE12050 GB
Chapter 1 Piping Work
1-1 Preparation for Piping Work ................................................................................................................ 3
1-1-1 Read before Servicing ............................................................................................................................ 3
1-1-2 Tool Preparation ..................................................................................................................................... 4
1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil...................... 5
1-2-1 Piping Materials ...................................................................................................................................... 5
1-2-2 Storage of Piping Materials..................................................................................................................... 7
1-2-3 Pipe Processing ...................................................................................................................................... 7
1-2-4 Characteristics of the New and Conventional Refrigerants .................................................................... 8
1-2-5 Refrigerant Oil ......................................................................................................................................... 9
1-3 Working with Refrigerant Piping ....................................................................................................... 10
1-3-1 Pipe Brazing.......................................................................................................................................... 10
1-3-2 Air Tightness Test ................................................................................................................................. 11
1-3-3 Vacuum Drying ..................................................................................................................................... 12
1-3-4 Refrigerant Charging............................................................................................................................. 13
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[1-1 Preparation for Piping Work ]
CAUTION
1 Piping Work
1-1 Preparation for Piping Work
1-1-1 Read before Servicing
1. Check the type of refrigerant used in the system to be serviced.
Refrigerant Type
Multi air conditioner for building application CITY MULTI YKM-A 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.
For information about the correct use of tools, refer to the following page(s). [1-1-2 Tool Preparation](page 4)
5. Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be moved or replaced.
Use refrigerant pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free
of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and water.
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.
1 Piping Work
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.
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[1-1 Preparation for Piping Work ]
1-1-2 Tool Preparation
Prepare the following tools and materials necessary for installing and servicing the unit.
Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C)
1. To be used exclusively with R410A (not to be used if used with R22 or R407C)
Tools/Materials Use Notes
Gauge Manifold Evacuation and refrigerant charging Higher than 5.09MPa[738psi] on the
Charging Hose Evacuation and refrigerant charging The hose diameter is larger than the
Refrigerant Recovery Cylinder Refrigerant recovery
Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The
Charging Port on the Refrigerant Cylinder Refrigerant charging The charge port diameter is larger
Flare Nut Connection of the unit with the pipes Use Type-2 Flare nuts.
2. Tools and materials that may be used with R410A with some restrictions
Tools/Materials Use Notes
Gas Leak Detector Gas leak detection The ones for use with HFC refrigerant
Vacuum Pump Vacuum drying May be used if a check valve adapter
Flare Tool Flare processing Flare processing dimensions for the
high-pressure side
conventional model.
cylinder is pink.
than that of the current port.
may be used.
is attached.
piping in the system using the new refrigerant differ from those of R22. Refer to the following page(s). [1-2-1
Piping Materials](page 5)
Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with
3. Tools and materials that are used with R22 or R407C that may also be used 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
Pipe Cutter Cutting pipes
Welder and Nitrogen Cylinder Welding pipes
Refrigerant Charging Meter Refrigerant charging
Vacuum Gauge Vacuum level check
4. Tools and materials that must not be used with R410A
Tools/Materials Use Notes
Charging Cylinder Refrigerant charging Prohibited to use
R410A.
for pipes that have a diameter of
ø12.7 (1/2") and ø15.88 (5/8") have
been changed.
Tools for R410A must be handled with special care to keep moisture and dust from infiltrating the cycle.
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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
1-2 Handling and Characteristics of Piping Materials,
Refrigerant, and Refrigerant Oil
1-2-1 Piping Materials
Do not use the existing piping!
1. Copper pipe materials
O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands.
1/2H-material (Drawn) Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed)
at the same radial thickness.
The distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes them-
selves.
O-materials (Annealed) can easily be bent with hands.
1/2H-materials (Drawn) are considerably stronger than O-material (Annealed) at the same thickness.
2. Types of copper pipes
Maximum working pressure Refrigerant type
3.45 MPa [500psi] R22, R407C etc.
4.30 MPa [624psi] R410A etc.
3. Piping materials/Radial thickness
Use refrigerant pipes made of phosphorus deoxidized copper.
The operation pressure of the units that use R410A is higher than that of the units that use R22.
Use pipes that have at least the radial thickness specified in the chart below.
(Pipes with a radial thickness of 0.7 mm or less may not be used.)
Pipe size (mm[in]) Radial thickness (mm) Type
ø6.35 [1/4"] 0.8t
1 Piping Work
ø9.52 [3/8"] 0.8t
ø12.7 [1/2"] 0.8t
ø15.88 [5/8"] 1.0t
ø19.05 [3/4"] 1.0t
ø22.2 [7/8"] 1.0t
ø25.4 [1"] 1.0t
ø28.58 [1-1/8"] 1.0t
ø31.75 [1-1/4"] 1.1t
ø34.93 [1-3/8"] 1.1t
ø41.28 [1-5/8"] 1.2t
The pipes in the system that uses the refrigerant currently on the market are made with O-material (Annealed), even if the
pipe diameter is less than ø19.05 (3/4"). For a system that uses R410A, use pipes that are made with 1/2H-material (Drawn)
unless the pipe diameter is at least ø19.05 (3/4") and the radial thickness is at least 1.2t.
The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.
O-material (Annealed)
1/2H-material,
H-material (Drawn)
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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
Dimension A
Dimension B
4. Thickness and refrigerant type indicated on the piping materials
Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant.
5. Flare processing (O-material (Annealed) and OL-material only)
The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system.
Flare processing dimensions (mm[in])
A dimension (mm)
Pipe size (mm[in])
R410A R22, R407C
ø6.35 [1/4"] 9.1 9.0
ø9.52 [3/8"] 13.2 13.0
ø12.7 [1/2"] 16.6 16.2
ø15.88 [5/8"] 19.7 19.4
ø19.05 [3/4"] 24.0 23.3
If a clutch-type flare tool is used to flare the pipes in the system using R410A, the length of the pipes must be between 1.0
and 1.5 mm. For margin adjustment, a copper pipe gauge is necessary.
6. Flare nut
The flare nut type has been changed to increase the strength. The size of some of the flare nuts have also been changed.
Flare nut dimensions (mm[in])
B dimension (mm)
Pipe size (mm[in])
R410A R22, R407C
ø6.35 [1/4"] 17.0 17.0
ø9.52 [3/8"] 22.0 22.0
ø12.7 [1/2"] 26.0 24.0
ø15.88 [5/8"] 29.0 27.0
ø19.05 [3/4"] 36.0 36.0
The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.
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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
1-2-2 Storage of Piping Materials
1. Storage location
Store the pipes to be used indoors. (Warehouse at site or owner's warehouse)
If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe.
1 Piping Work
2. Sealing the pipe ends
Both ends of the pipes should be sealed until just before brazing.
Keep elbow pipes and T-joints in plastic bags.
The new refrigerator oil is 10 times as hygroscopic as the conventional refrigerating machine oil (such as Suniso) and, if not
handled with care, could easily introduce moisture into the system. Keep moisture out of the pipes, for it will cause the oil to
deteriorate and cause a compressor failure.
1-2-3 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.
HWE12050 GB
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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
1-2-4 Characteristics of the New and Conventional 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.
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
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
1.557/226 0.9177/133 0.94/136
(25°C,MPa/77°F,psi) (gauge)
Saturated Steam Density
64.0 42.5 44.4
(25°C,kg/m3/77°F,psi)
Non-azeotropic
Refrigerant
Single Refrigerant
Flammability Nonflammable Nonflammable Nonflammable
Ozone Depletion Coefficient (ODP)
Global Warming Coefficient (GWP)
*1
*2
Refrigerant Charging Method Refrigerant charging in
Replenishment of Refrigerant after a Refrigerant
0 0 0.055
1730 1530 1700
the liquid state
Refrigerant charging in
the liquid state
Refrigerant charging in
the gaseous state
Available Available Available
Leak
*1 When CFC11 is used as a reference
*2 When CO2 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.
Pressure (gauge)
Temperature (°C/°F)
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
HWE12050 GB
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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
1-2-5 Refrigerant 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.
Refrigerant Refrigerating machine oil
R22 Mineral oil
R407C Ester oil
R410A 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.
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 Oxidization
Adhesion to expansion valve and capillary
tubes
Clogged expansion valve, capillary tubes, and
drier
Poor cooling performance
Infiltration of
contaminants
Dust, dirt
Infiltration of contaminants into the compressor
Compressor overheat
Burn-in on the orbiting scroll
Sludge formation and adhesion Clogged expansion valve and capillary tubes
Mineral oil
etc.
Poor cooling performance
Compressor overheat
Oil degradation Burn-in on the orbiting scroll
1 Piping Work
*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.
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[1-3 Working with Refrigerant Piping ]
1-3 Working with Refrigerant Piping
1-3-1 Pipe 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
Use of oxidized solder for brazing Use of non-oxidized solder for brazing
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
The new refrigerating machine oil is 10 times as hygroscopic as the conventional oil and is more likely to cause unit failure if
water infiltrates into the system.
Flux generally contains chloride. Residual flux in the refrigerant circuit will cause sludge to form.
3. Notes
Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.
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[1-3 Working with Refrigerant Piping ]
1-3-2 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 Piping Work
Halide torch R22 leakage detector
1. Items to be strictly observed
Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight-
ness, taking temperature variations into account.
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
Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an
HFC(R410A) leak.
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[1-3 Working with Refrigerant Piping ]
1-3-3 Vacuum Drying
(Photo1) 15010H (Photo2) 14010
Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge
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.)
HWE12050 GB
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[1-3 Working with Refrigerant Piping ]
1-3-4 Refrigerant Charging
Cylinder with a siphon
Cylinder without a siphon
Cylin-
Cylin-
der
der
Cylinder color R410A is pink. Refrigerant charging in the liquid state
Valve Valve
liquid
liquid
1 Piping Work
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 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.
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.
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 the following page(s).[8-11 Measures for Refrigerant Leakage](page 246)
HWE12050 GB
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[1-3 Working with Refrigerant Piping ]
HWE12050 GB
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Chapter 2 Restrictions
2-1 System Configurations....................................................................................................................... 17
2-2 Types and Maximum Allowable Length of Cables........................................................................... 18
2-3 Switch Settings ................................................................................................................................... 19
2-4 M-NET Address Settings .................................................................................................................... 20
2-4-1 Address Settings List ............................................................................................................................ 20
2-4-2 Outdoor Unit Power Jumper Connector Connection.............................................................................21
2-4-3 Outdoor Unit Centralized Controller Switch Setting .............................................................................. 21
2-4-4 Room Temperature Detection Position Selection ................................................................................. 21
2-4-5 Start/Stop Control of Indoor Units ......................................................................................................... 22
2-4-6 Miscellaneous Settings ......................................................................................................................... 22
2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor Unit .......................... 23
2-5 Demand Control Overview ................................................................................................................. 26
2-6 System Connection Example............................................................................................................. 28
2-7 Example System with an MA Remote Controller ............................................................................. 30
2-7-1 Single Refrigerant System (Automatic Indoor/Outdoor Address Startup) ............................................. 30
2-7-2 Single Refrigerant System with Two or More LOSSNAY Units ............................................................ 32
2-7-3 Grouped Operation of Units in Separate Refrigerant Circuits ............................................................... 34
2-7-4 System with a Connection of System Controller to Centralized Control Transmission Line ................. 36
2-7-5 System with a Connection of System Controller to Indoor-Outdoor Transmission Line ....................... 38
2-8 Example System with an ME Remote Controller ............................................................................. 40
2-8-1 System with a Connection of System Controller to Centralized Control Transmission Line ................. 40
2-9 Example System with an MA and an ME Remote Controller .......................................................... 42
2-9-1 System with a Connection of System Controller to Centralized Control Transmission Line ................. 42
2-10 Restrictions on Refrigerant Pipes ..................................................................................................... 44
2-10-1 Restrictions on Refrigerant Pipe Length ............................................................................................... 44
2-10-2 Restrictions on Refrigerant Pipe Size ................................................................................................... 46
HWE12050 GB
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HWE12050 GB
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[2-1 System Configurations ]
2 Restrictions
2-1 System Configurations
1. Table of compatible indoor units
(1) High COP combinations
The table below summarizes the types of indoor units that are compatible with different types of outdoor units.
Outdoor units Composing units Maximum total
capacity of con-
nectable indoor
units
Maximum
number of
connect-
able indoor
units
EP200 YKM-A - - - 100 - 260 17
EP250 YKM-A - - - 125 - 325 21
EP300 YKM-A - - - 150 - 390 26
EP350 YKM-A - - - 175 - 455 30
YKM-A - - -
EP400
200 - 520 34
YSKM-A EP200 EP200 -
YKM-A - - -
EP450
225 - 585 39
YSKM-A EP250 EP200 -
EP500 YSKM-A EP300 EP200 - 250 - 650 43
EP550 YSKM-A EP300 EP250 - 275 - 715 47
EP600 YSKM-A EP300 EP300 - 300 - 780 50
EP650 YSKM-A EP250 EP200 EP200 325 - 845
EP700 YSKM-A EP300 EP200 EP200 350 - 910
EP750 YSKM-A EP300 EP250 EP200 375 - 975
EP800 YSKM-A EP300 EP300 EP200 400 - 1040
Types of connectable
indoor units
P15 - P200 models
R410A series indoor units
P15 - P400 models
R410A series indoor units
2 Restrictions
P15 - P500 models
R410A series indoor units
EP850 YSKM-A EP300 EP300 EP250 425 - 1105
EP900 YSKM-A EP300 EP300 EP300 450 - 1170
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.
HWE12050 GB
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[2-2 Types and Maximum Allowable Length of Cables ]
TB 3 TB 7 TB 3 TB
7
TB
3
TB 3 TB
7
TB
7
TB 3 TB
7
TB
3
TB
7
TB 3 TB 7 TB 3 TB
7
TB
3
TB 3 TB
7
TB
7
TB 3 TB
7
TB
3
TB
7
2-core shielded cable
2-core shielded cable
Indoor unit
Outdoor unit
TB3: Terminal block for indoor-outdoor transmission line TB7: Terminal block for centralized control
Remote Controller
Indoor unit
Outdoor unit
Remote Controller
multiple-core cable
2-2 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.
7) When extending the transmission cable, be sure to extend the shield wire.
(2) Control wiring
Different types of control wiring are used for different systems. Before performing wiring work, refer to the following page(s).
[2-7 Example System with an MA Remote Controller](page 30)
[2-8 Example System with an ME Remote Controller](page 40)
[2-9 Example System with an MA and an ME Remote Controller](page 42)
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
Facility
type
Type Shielded cable CVVS, CPEVS, MVVS
Cable type
Number of
cores
Cable size Larger than 1.25mm2 [AWG16]
Maximum transmission
line distance between the
outdoor unit and the farthest indoor unit
Maximum transmission
line distance for centralized control and Indoor/
outdoor transmission line
(Maximum line distance
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.
via outdoor unit)
All facility types
2-core cable
200 m [656ft] max.
HWE12050 GB
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[2-3 Switch Settings ]
2) Remote controller wiring
Type CVV CVV
Number of
cores
Cable type
Cable size
Maximum overall line
length
*1 MA remote controller refers to MA remote controller (PAR-31MAA, 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
*4 When connected to the terminal block on the Simple remote controller, use cables that meet the cable size specifi-
cations shown in the parenthesis.
*5 When connecting PAR-31MAA or MA Simple remote controller, use sheathed cables with a minimum thickness of
0.3 mm
2
.
MA remote controller
*1
2-core cable 2-core cable
0.3 to 1.25mm
[AWG22 to 16]
(0.75 to 1.25mm2 )
0.3 to 1.25mm
[AWG22 to 16]
2 *3 *5
[AWG18 to 16]
The section of the cable that exceeds 10m
200 m [656ft] max.
[32ft] must be included in the maximum indoor-outdoor transmission line distance.
2
(AWG18) is recommended for easy handling.
ME remote controller
2 *3
*4
*2
2 Restrictions
2-3 Switch Settings
1. Switch setting
The necessary switch settings depend on system configuration. Before performing wiring work, refer to the following page(s).
[2-7 Example System with an MA Remote Controller](page 30)
[2-8 Example System with an ME Remote Controller](page 40)
[2-9 Example System with an MA and an ME Remote Controller](page 42)
If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not
function properly.
Units on which to set the switches Symbol Units to which the power must be shut off
*3
CITY MULTI indoor unit Main/sub unit IC Outdoor units
LOSSNAY, OA processing unit
*1
LC Outdoor units
ATW Booster Unit BU Outdoor units and Booster Unit
Water Hex Unit AU Outdoor units and Water Hex Unit
Air handling kit IC Outdoor units
unit
ME remote controller Main/sub remote
RC Outdoor units
controller
MA remote controller
*4
Main/sub remote
MA Indoor units
controller
CITY MULTI outdoor unit
*2
OC,OS1,OS2 Outdoor units
*1. Applicable when LOSSNAY units are connected to the indoor-outdoor transmission line.
*2. The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2 in the order of
capacity from large to small (if two or more units have the same capacity, in the order of address from small to large).
*3. Turn off the power to all the outdoor units in the same refrigerant circuit.
*4. When a PAR-31MAA is connected to a group, no other MA remote controllers can be connected to the same group.
*5. When setting the switch SW4 of the control board, set it with the outdoor unit power on. Refer to the following page(s).
[5-1-1 Outdoor Unit Switch Functions and Factory Settings](page 77)
and Indoor units
*3
and LOSSNAY
*3
or field supplied air handling
*3
*3 *5
HWE12050 GB
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[2-4 M-NET Address Settings ]
2-4 M-NET Address Settings
2-4-1 Address Settings List
1. M-NET Address settings
(1) Address settings table
The need for address settings and the range of address setting depend on the configuration of the system.
Unit or controller Address setting
Setting method Facto-
range
CITY MULTI indoor unit
Main/sub unit 00,
01 to 50
*1*6
Assign the smallest address to the main indoor unit in the
group, and assign sequential address numbers to the rest
of the indoor units in the same group.
*4
M-NET adapter
M-NET control interface
Free Plan adapter
LOSSNAY, OA processing unit
Air handling kit
ATW Booster Unit
00,
01 to 50
*1*6
Assign an arbitrary but unique address to each of
these units after assigning an address to all indoor
units.
Water Hex Unit
ME remote controller
MA remote controller No address settings required. (The main/sub setting must be made if 2
CITY MULTI outdoor unit 00,
Main remote
controller
Sub remote
controller
101 to 150 Add 100 to the smallest address of all the indoor units
in the same group.
*2
151 to 200
Add 150 to the smallest address of all the indoor units
in the same group.
remote controllers are connected to the system.)
Assign sequential addresses to the outdoor units in the
same refrigerant circuit. The outdoor units in the same
refrigerant circuit are automatically designated as OC
and OS.
*5
51 to 100
*1,*3,*6
*7
ry set-
ting
00
00
101
Main
00
System controller Group remote
controller
System remote
controller
ON/OFF remote controller
Schedule timer
(compatible
201 to 250 Assign an address that equals the sum of the smallest
group number of the group to be controlled and 200.
Assign an arbitrary but unique address within the
range listed on the left to each unit.
Assign an address that equals the sum of the smallest
group number of the group to be controlled and 200.
Assign an arbitrary but unique address within the
range listed on the left to each unit.
201
202
with M-NET)
Central controller
AG-150A
000,
201 to 250
Assign an arbitrary but unique address within the
range listed on the left to each unit. The address must
be set to "000" to control the K-control unit.
000
GB-50ADA
G(B)-50A
LM adapter 201 to 250 Assign an arbitrary but unique address within the
247
range listed on the left to each unit.
*1. Address setting is not required for a City Multi system that consists of a single refrigerant circuit (with some exceptions).
*2. To set the ME remote controller address to "200", set the rotary switches to "00".
*3. To set the outdoor unit address to "100," set the rotary switches to "50."
*4. Some indoor units have 2 or 3 controller boards that require address settings.
No. 2 controller board address must be equal to the sum of the No. 1 controller board address and 1, and the No.3
controller board address must equal to the No. 1 controller address and 2.
*5. The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2 in the order of
capacity from large to small (if two or more units have the same capacity, in the order of address from small to large).
*6. If a given address overlaps any of the addresses that are assigned to other units, use a different, unused address within the
setting range.
*7. When a PAR-31MAA is connected to a group, no other MA remote controllers can be connected to the same group.
HWE12050 GB
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[2-4 M-NET Address Settings ]
2-4-2 Outdoor Unit Power Jumper Connector Connection
There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the DATABOOK
for details.
System configuration
Connection to
the system controller
Power supply unit
for transmission
lines
Group operation
of units in a system with multiple
Power supply switch connector connection
outdoor units
System with
one outdoor unit
System with
multiple outdoor
units
_ _ _ Leave CN41 as it is
(Factory setting)
Not connected _ Not grouped
Grouped Disconnect the male connector from the fe-
With connection
to the indoor
unit system
With connection
to the centralized control
system
Not required Grouped/not
grouped
Not required
(Powered from the
*1
Grouped/not
grouped
outdoor unit)
Required *
1
Grouped/not
grouped
male power supply switch connector (CN41)
and connect it to the female power supply
switch connector (CN40) on only one of the
outdoor units.
*Connect the S (shielded) terminal on the ter-
minal block (TB7) on the outdoor unit whose
CN41 was replaced with CN40 to the
ground terminal ( ) on the electric box.
Leave CN41 as it is
(Factory setting)
*2
*1 The need for a power supply unit for transmission lines depends on the system configuration. Some controllers, such as
GB-50ADA, have a function to supply power to the transmission lines.
*2 The replacement of the power jumper connector from CN41 to CN40 must be performed on only one outdoor unit in the
system.
2-4-3 Outdoor Unit Centralized Controller Switch Setting
2 Restrictions
System configuration Centralized control switch (SW5-1) settings *
Connection to the system controller Not connected Leave it to OFF. (Factory setting)
Connection to the system controller Connected *
2
ON
*1 Set SW5-1 on all outdoor units in the same refrigerant circuit to the same setting.
*2 When only the LM adapter is connected, leave SW5-1 to OFF (as it is).
2-4-4 Room Temperature Detection Position Selection
To stop the fan during heating Thermo-OFF (SW1-7 and 1-8 on the indoor units to be set to ON), use the built-in thermistor
on the remote controller or an optional thermistor.
1) To use the built-in sensor on the remote controller, set the SW1-1 to ON.
(Factory setting: SW1-1 set to "OFF".)
Some models of remote controllers are not equipped with a built-in temperature sensor.
Use the built-in temperature sensor on the indoor unit instead.
When using the built-in sensor on the remote controller, install the remote controller where room temperature can be detected.
(Note) Factory setting for SW1-1 on the indoor unit of the All-Fresh Models is ON.
2) When an optional temperature sensor is used, set SW1-1 to OFF, and set SW3-8 to ON.
When using an optional temperature sensor, install it where room temperature can be detected.
1
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