Mitsubishi Electric City Multi PURY-M200YNW-A1 How to use

i
Safety Precautions
Read and observe the safety precautions below and the instructions provided on the labels affixed to the unit.
Retain this manual for future reference. Make sure that this manual is passed on to the end users.
All refrigerant piping work, electrical work, air-tightness test, and brazing work must be performed by qualified personnel.
Incorrect use may result in serious injury.
[1] General Precautions
indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
addresses practices not related to personal injury, such as product
and/or property damage.
General Precautions
Do not use any refrigerant other than the
type indicated in the manuals for the unit
and on the nameplate.
Doing so will cause the unit or pipes to burst, or result
in an explosion or fire during use, during repairs, 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 result-
ing from the use of the wrong type of refrigerant.
Do not use the unit in an unusual environ-
ment.
If the unit is used in areas exposed to large amounts of
oil, steam, organic solvents, or corrosive gases (such
as ammonia, sulfuric compounds, or acids), or areas
where acidic/alkaline solutions or special chemical
sprays are used frequently, it may significantly reduce
the performance and corrode the internal parts, result-
ing in refrigerant leakage, water leakage, injury, elec-
tric shock, malfunction, smoke, or fire.
Do not change the settings of the safety or
protection devices.
Forcing the unit to operate by disabling the safety de-
vices, such as the pressure switch or the thermal
switch, may result in bursting, fire, or explosion.
Operating the unit with a safety device whose settings
have been changed may result in bursting, fire, or ex-
plosion.
Using safety devices other than those specified by Mit-
subishi Electric may result in bursting, fire, or explo-
sion.
Do not alter or modify the unit.
Doing so will result in refrigerant leakage, water leak-
age, serious injury, electric shock, or fire.
Do not wet the electrical parts.
Doing so may result in current leakage, electric shock,
malfunction, or fire.
Do not touch the electrical parts, switches,
or buttons with wet fingers.
Doing so may result in electric shock, malfunction, or
fire.
Do not touch the refrigerant pipes and re-
frigerant line components with bare hands
during and immediately after operation.
The refrigerant in the pipes will be very hot or very cold,
resulting in frostbite or burns.
Do not touch the electrical parts with bare
hands during and immediately after opera-
tion.
Doing so may result in burns.
Ventilate the room while servicing the unit.
If the refrigerant leaks, oxygen deficiency may result. If
the leaked refrigerant comes in contact with a heat
source, toxic gas will be generated.
If you notice any abnormality (e.g., a burn-
ing smell), stop the operation, turn off the
power switch, and consult your dealer.
Continuing the operation may result in electric shock,
malfunction, or fire.
Properly install all required covers and pan-
els on the terminal box and the control box.
If dust or water enters the unit, this may result in electric
shock or fire.
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ii
[2] Transportation a nd Installation
Periodically check the unit base for dam-
age.
If the damage is left uncorrected, the unit will fall and
cause serious injury.
Consult your dealer for the proper disposal
of the unit.
The refrigerant oil and the refrigerant in the unit will
pose a risk of environmental pollution, fire, or explo-
sion.
Do not use means to accelerate the defrost-
ing process or to clean, other than those
recommended by the manufacturer.
The unit shall be stored in a room without
continuously operating ignition sources
(for example: open flames, an operating gas
appliance or an operating electric heater.)
Do not pierce or burn.
Be aware that refrigerants may not contain
an odour.
The unit shall be installed, operated and
stored in a room with a floor area according
to the following figure.
When installing an HBC, take safety mea-
sures in accordance with the European
Standard, based on the system refrigerant
amount and the room volume as shown in
the figure below. (The installation restric-
tions can be simply found by using the flow-
chart provided on a separate sheet.)
The unit shall be properly stored to prevent
mechanical damage.
0
10
20
30
40
50
60
70
80
0 50 100 150 200 250 300 350 400 450 500 550 600 650
At least two safety
measures are
required.
Room volume [m
3
]
System refrigerant amount [kg]
NG (ISO 5149)
At least one safety
measure is required.
Construction guidance
Children should be supervised to ensure
that they do not play with the appliance.
Do not operate the unit with the panels and
guards removed.
Rotating, hot, or high-voltage parts may cause injury,
electric shock, or fire.
Do not touch fans, heat exchanger fins, or
the sharp edges of components with bare
hands.
Doing so may result in injury.
Wear protective gloves when working on
the unit.
Failure to do so may result in injury.
High-pressure pipes poses a risk of burns if touched
with bare hands while the unit is in operation.
Check that markings of the unit are not illeg-
ible.
Illegible warning or caution markings may cause dam-
age to the unit, resulting in injury.
Transportation and Installation
When lifting the unit, pass the slings
through the four designated sling holes.
Improper lifting will cause the unit to topple or fall, re-
sulting in serious injury.
Do not lift the unit with the PP bands that are
used on some products.
Doing so may result in injury.
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iii
[3] Installation
[4] Piping Work
Observe the restrictions on the maximum
weight that a person can lift, which is spec-
ified in local regulations.
Failure to do so may result in injury.
Installation
Do not install the unit where combustible
gas may leak.
If combustible gas accumulates around the unit, fire or
explosion may result.
Do not allow children to play with the pack-
ing materials.
Suffocation or serious injury may result.
Cut up the packing materials before dispos-
al.
All installation work must be performed by
qualified personnel in accordance with this
manual.
Improper installation may result in refrigerant leakage,
water leakage, serious injury, electric shock, or fire.
If the air conditioner is installed in a small
room, take measures to prevent the refriger-
ant concentration from exceeding the safety
limit in the event of refrigerant leakage.
Consult your dealer regarding the appropriate mea-
sures to prevent the allowable concentration from be-
ing exceeded. If the refrigerant leaks and the allowable
concentration is exceeded, hazards due to a lack of ox-
ygen in the room will result.
Install the unit in accordance with the in-
structions to minimize the risk of damage
from earthquakes and strong winds.
Improper installation will cause the unit to topple, re-
sulting in serious injury.
The unit must be securely installed on a
structure that can sustain its weight.
Failure to do so will cause the unit to fall, resulting in se-
rious injury.
Do not open the control box cover when
charging refrigerant.
Doing so may cause sparks, resulting in fire.
Seal all openings around pipes and wires to
keep out small animals, rainwater, or snow.
Failure to do so may result in current leakage, electric
shock, or damage to the unit.
Do not install the unit where corrosive gas
may be generated.
Doing so can corrode the pipes, resulting in refrigerant
leakage and fire.
Piping Work
Piping work shall be kept to a minimum.
The pipes shall be protected from physical
damage.
Before heating the brazed sections, remove
the gas and oil that are trapped in the pipes.
Failure to do so may generate fire, resulting in serious
injury.
Do not purge the air using refrigerant. Use a
vacuum pump to evacuate the system.
Residual gas in the refrigerant lines will cause bursting
of the pipes or an explosion.
Do not use oxygen, flammable gas, or a re-
frigerant containing chlorine for air-tight-
ness testing.
Doing so may result in an explosion. Chlorine will dete-
riorate the refrigerant oil.
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iv
[5] Wiring Work
[6] Relocation and Repairs
When installing or relocating the unit, do
not allow air or any substance other than
the specified refrigerant to enter the refrig-
erant lines.
Any substance other than the specified refrigerant may
cause abnormally high pressure in the refrigerant
lines, resulting in bursting of the pipes or an explosion.
After the installation has been completed,
check for refrigerant leaks.
If the refrigerant leaks, oxygen starvation may result. If
the leaked refrigerant comes in contact with a heat
source, toxic gas will be generated.
Have a fire extinguisher nearby before braz-
ing work.
If the refrigerant leaks while brazing work is being per-
formed, fire may result.
Provide no-smoking signs at the brazing
workplace.
If the refrigerant leaks when an ignition source is pres-
ent, fire may result.
Pipes with outer diameter exceeding 33.4
mm are subject to the Pressure Equipment
Directive (PED), and brazing of these pipes
must be done by PED certified personnel.
Wiring Work
Include some slack in the power cables.
Failure to do so may break or overheat the cables, re-
sulting in smoke or fire.
Connections must be made securely and
without tension on the terminals.
Improperly connected cables may break, overheat, or
cause smoke or fire.
Tighten all terminal screws to the specified
torque.
Loose screws and contact failure may result in smoke
or fire.
Electrical work must be performed by quali-
fied personnel in accordance with local reg-
ulations and the instructions provided in
this manual. Only use the specified cables
and dedicated circuits.
Inadequate power source capacity or improper electri-
cal work will result in electric shock, malfunction, or
fire.
Install an earth leakage breaker on the pow-
er supply of each unit.
Failure to do so may result in electric shock or fire.
Only use properly rated breakers (an earth
leakage breaker, local switch <a switch +
fuse that meets local electrical codes>, or
overcurrent breaker).
Failure to do so may result in electric shock, malfunc-
tion, smoke, or fire.
Only use standard power cables of suffi-
cient capacity.
Failure to do so may result in current leakage, over-
heating, smoke, or fire.
Proper grounding must be provided by
qualified personnel.
Improper grounding may result in electric shock, fire,
explosion, or malfunction due to electrical noise. Do
not connect the ground wire to gas or water pipes,
lightning rods, or telephone ground wires.
After the wiring work has been completed,
measure the insulation resistance, and
make sure that it reads at least 1 MΩ.
Failure to do so may result in electric leakage, malfunc-
tion, or fire.
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v
[7] Additional Precautions
Relocation and Repairs
Only qualified personnel must relocate or
repair the unit. Do not attempt to disassem-
ble or alter the unit.
Failure to do so will result in refrigerant leakage, water
leakage, serious injury, electric shock, or fire.
Do not service the unit in the rain.
Doing so may result in electric leakage, electric shock,
wire shorting, malfunction, smoke, or fire.
Check for refrigerant leaks before service.
If the refrigerant leaks, fire may result.
Do not open the control box cover when re-
covering, charging, or purging refrigerant.
Doing so may cause sparks, resulting in fire.
Additional Precautions
Do not turn off the power immediately after
stopping operation.
Wait for at least five minutes after the unit has stopped
before turning off the power. Failure to do so may re-
sult in drain water leakage or the mechanical failure of
sensitive parts.
The unit must be periodically inspected by a
dealer or qualified personnel.
If dust or dirt accumulates inside the unit, the drain
pipes may become clogged, and water leakage from
the pipes may wet the surroundings and generate
odours.
Turn on the power at least 12 hours before
starting operation. Keep the power turned
on throughout the operating season.
Insufficient energizing will result in malfunction.
Do not use the air conditioner for special
purposes (e.g. keeping food, animals,
plants, precision devices, or art objects in a
room).
Such items could be damaged or deteriorated.
Collect the refrigerant and properly dispose
of it in accordance with local regulations.
Do not install the unit on or over items that
are subject to water damage.
When the room humidity exceeds 80% or if the drain
pipe is clogged, condensation may collect and drip
from the indoor unit onto the ceiling or floor.
Drain piping must be installed by a dealer or
qualified personnel to ensure proper drain-
age.
Improper drain piping may cause water leakage, result-
ing in damage to furniture and other surroundings.
Take appropriate measures against electri-
cal noise interference when installing the
unit in hospitals or radio communication fa-
cilities.
Inverter, high-frequency medical, or wireless communi-
cation equipment as well as power generators may
cause the air conditioning system to malfunction. The
air conditioning system may also adversely affect the
operation of these types of equipment by creating elec-
trical noise.
Insulate pipes to prevent condensation.
Condensation may collect and drip from the unit onto
the ceiling or floor.
Keep the service valves closed until refrig-
erant charging is completed.
Failure to do so will damage the unit.
Place a wet towel on the service valves be-
fore brazing the pipes to keep the tempera-
ture of the valves from rising above 120ºC
(248ºF).
Failure to do so may result in equipment damage.
Keep the flame out of contact with the ca-
bles and metal sheet when brazing the
pipes.
Failure to do so may result in burnout or malfunction.
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vi
Use the following tools specifically de-
signed for use with the specified refriger-
ant: Gauge manifold, charge hose, gas leak
detector, check valve, refrigerant charge
base, vacuum gauge, and refrigerant recov-
ery equipment.
Gas leak detectors for conventional refrigerants will not
react to a refrigerant that does not contain chlorine.
If the specified refrigerant is mixed with water, refriger-
ant oil, or another refrigerant, the refrigerant oil will de-
teriorate and the compressor will malfunction.
Use a vacuum pump with a check valve.
If the vacuum pump oil flows back into the refrigerant
lines, the refrigerant oil may deteriorate and the com-
pressor may malfunction.
Keep tools clean.
If dust, dirt, or water accumulates on the charging hose
or the flare processing tool, the refrigerant will deterio-
rate and the compressor will malfunction.
Use refrigerant piping made of phosphorus
deoxidized copper (copper and copper alloy
seamless pipes) that meets local require-
ments. Pipe joints should also meet local re-
quirements. Keep the inner and outer
surfaces of the pipes clean and free of sul-
phur, oxides, dust/dirt, shaving particles,
oils, moisture, or any other contaminants.
Contaminants on the inside of the refrigerant piping will
cause the refrigerant oil to deteriorate and cause the
compressor to malfunction.
Store pipes indoors, and keep both ends of
the pipes sealed until just before making a
flare connection or brazing. (Store elbows
and other joints in plastic bags.)
If dust, dirt, or water enters the refrigerant lines, the re-
frigerant oil will deteriorate and the compressor will
malfunction.
Braze the pipes with a nitrogen purge to
avoid oxidation.
Oxidized flux inside the refrigerant pipes will cause the
refrigerant oil to deteriorate and cause the compressor
to malfunction.
Do not use existing refrigerant piping.
The old refrigerant and refrigerant oil in the existing pip-
ing contain a large amount of chlorine, which will cause
the refrigerant oil in the new unit to deteriorate and
cause the compressor to malfunction.
If a large electric current flows due to a mal-
function or faulty wiring, earth-leakage
breakers on the unit side and on the up-
stream side of the power supply system
could both operate. Depending on the im-
portance of the system, separate the power
supply system or take protective coordina-
tion of breakers.
This appliance is intended to be used by ex-
pert or trained users in shops, in light indus-
try and on farms, or for commercial use by
lay persons.
This appliance is not intended for use by
persons (including children) with reduced
physical, sensory or mental capabilities, or
lack of experience and knowledge, unless
they have been given supervision or in-
struction concerning use of the appliance
by a person responsible for their safety.
Store the unit in a room large enough to al-
low clearance in the event of refrigerant
leakage.
Refrigerant R32 is flammable. Do not use a
naked-flame type detector.
Only qualified personnel may touch the
USB port in the control box.
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CONTENTS
HWE21050 GB
Chapter 1 Check Before Servicing
1-1 Preparation for Piping Work.................................................................................................................. 1
1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ....................... 3
1-3 Working with Refrigerant Piping......................................................................................................... 14
1-4 Precautions for Wiring......................................................................................................................... 19
1-5 Cautionary notes on installation environment and maintenance.................................................... 21
Chapter 2 Restrictions
2-1 System Configurations .......................................................................................................................... 1
2-2 Types and Maximum Allowable Length of Cables .............................................................................. 2
2-3 Switch Settings....................................................................................................................................... 3
2-4 M-NET Address Settings ....................................................................................................................... 4
2-5 Demand Control Overview .................................................................................................................... 9
2-6 System Connection Example .............................................................................................................. 10
2-7 Example System with an MA Remote Controller .............................................................................. 11
2-8 Example System with an ME Remote Controller............................................................................... 24
2-9 Example System with an MA and an ME Remote Controller............................................................ 26
2-10 Restrictions on Refrigerant Pipes ...................................................................................................... 29
Chapter 3 Major Components, Their Functions and Refrigerant Circuits
3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ................................... 1
3-2 Outdoor Unit Refrigerant Circuit Diagrams ......................................................................................... 8
3-3 Functions of the Major Components of Outdoor Unit ...................................................................... 14
3-4 Functions of the Major Components of Indoor Unit ......................................................................... 16
3-5 External Appearance and Refrigerant Circuit Components of HBC................................................ 17
3-6 HBC Refrigerant Circuit Diagrams...................................................................................................... 22
3-7 Functions of the Major Components of HBC.....................................................................................24
Chapter 4 Electrical Components and Wiring Diagrams
4-1 Outdoor Unit Circuit Board Arrangement ............................................................................................ 1
4-2 Outdoor Unit Circuit Board Components ............................................................................................ 6
4-3 Outdoor Unit Electrical Wiring Diagrams........................................................................................... 17
4-4 Transmission Booster Electrical Wiring Diagrams........................................................................... 20
4-5 HBC Circuit Board Arrangement ........................................................................................................ 21
4-6 HBC Circuit Board Components......................................................................................................... 22
4-7 HBC Electrical Wiring Diagrams ......................................................................................................... 27
Chapter 5 Control
5-1 Dipswitch Functions and Factory Settings.......................................................................................... 1
5-2 Outdoor Unit Control ........................................................................................................................... 11
5-3 HBC Control.......................................................................................................................................... 22
Chapter 6 Test Run
6-1 Read before Test Run ............................................................................................................................ 1
6-2 Operation Characteristics and Refrigerant Charge ............................................................................ 2
6-3 Evaluating and Adjusting Refrigerant Charge..................................................................................... 2
6-4 The Following Symptoms Are Normal ................................................................................................. 4
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CONTENTS
HWE21050 GB
Chapter 7 Troubleshooting Using Error Codes
7-1 Error Code and Preliminary Error Code Lists ..................................................................................... 1
7-2 Error Code Definitions and Solutions: Codes [0 - 999].......................................................................8
7-3 Error Code Definitions and Solutions: Codes [1000 - 1999]............................................................. 11
7-4 Error Code Definitions and Solutions: Codes [2000 - 2999]............................................................. 15
7-5 Error Code Definitions and Solutions: Codes [3000 - 3999]............................................................. 24
7-6 Error Code Definitions and Solutions: Codes [4000 - 4999]............................................................. 26
7-7 Error Code Definitions and Solutions: Codes [5000 - 5999]............................................................. 48
7-8 Error Code Definitions and Solutions: Codes [6000 - 6999]............................................................. 61
7-9 Error Code Definitions and Solutions: Codes [7000 - 7999]............................................................. 81
7-10 Unit Error Code Definitions and Solutions: Codes [Er91 - Er99]..................................................... 90
Chapter 8 Troubleshooting Based on Observed Symptoms
8-1 MA Remote Controller Problems .......................................................................................................... 1
8-2 ME remote Controller Problems ........................................................................................................... 5
8-3 Refrigerant Control Problems ............................................................................................................. 10
8-4 Checking Transmission Waveform and for Electrical Noise Interference...................................... 15
8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems .......... 18
8-6 Troubleshooting Solenoid Valve Problems ....................................................................................... 22
8-7 Troubleshooting Outdoor Unit Fan Problems ...................................................................................23
8-8 Troubleshooting LEV, FCV Problems ................................................................................................ 24
8-9 Troubleshooting Problems with Major Components on HBC.......................................................... 34
8-10 Troubleshooting Inverter Problems ................................................................................................... 40
8-11 Control Circuit ...................................................................................................................................... 57
8-12 Measures for Refrigerant Leakage ..................................................................................................... 66
8-13 Parts Replacement Instructions (Outdoor Unit)................................................................................ 68
8-14 HBC Maintenance Instructions (Applicable to main and sub HBCs) ............................................ 127
8-15 Main-HBC Maintenance Instructions................................................................................................ 138
8-16 Sub-HBC Maintenance Instructions ................................................................................................. 177
8-17 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit..................... 182
Chapter 9 USB Function
9-1 Service Overview.................................................................................................................................... 1
9-2 Operation Data Collection and Storage Functions (Outdoor unit) ................................................... 4
9-3 Software Rewrite Function on the USB (Outdoor unit, HBC) ............................................................ 8
9-4 Maintenance LED Display and Troubleshooting............................................................................... 10
Chapter 10 LED Status Indicators
10-1 LED Status Indicators (Outdoor unit) .................................................................................................. 1
10-2 LED Status Indicators (HBC)................................................................................................................. 4
10-3 LED Status Indicators Table.................................................................................................................. 6
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GB_BS_01_L
Chapter 1 Check Before Servicing
1-1 Preparation for Piping Work ................................................................................................................ 1
1-1-1 Read before Servicing ............................................................................................................................ 1
1-1-2 Tool Preparation ..................................................................................................................................... 2
1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil...................... 3
1-2-1 Piping Materials ...................................................................................................................................... 3
1-2-2 Storage of Piping Materials..................................................................................................................... 4
1-2-3 Pipe Processing ...................................................................................................................................... 4
1-2-4 Differences in Refrigerant Properties...................................................................................................... 5
1-2-5 Precautions for handling equipment using R32 ...................................................................................... 6
1-2-6 Refrigerant Oil....................................................................................................................................... 13
1-3 Working with Refrigerant Piping ....................................................................................................... 14
1-3-1 Pipe Brazing.......................................................................................................................................... 14
1-3-2 Air Tightness Test................................................................................................................................. 15
1-3-3 Vacuum Drying ..................................................................................................................................... 16
1-3-4 Refrigerant Charging............................................................................................................................. 18
1-4 Precautions for Wiring ....................................................................................................................... 19
1-5 Cautionary notes on installation environment and maintenance .................................................. 21
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GB_BS_01_L
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[1-1 Preparation for Piping Work ]
BS_01_L chapter 1 - 1
1 Check Before Servicing
1 Check B efore Servic ing
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:R32
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 re-
frigerant.
For information about the correct use of tools, refer to the following page(s). [1-1-2 Tool Preparation]
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. Toxic hydrofluoric acid gas will form or refrigerant will ignite if leaked refrigerant is exposed to
an open flame. Be sure to keep the work area 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.
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[1-1 Preparation for Piping Work ]
2 - chapter 1 BS_01_L
1 Check Before Servicing
1-1-2 Tool Preparation
Prepare the following tools and materials necessary for installing and servicing the unit.
Tools for use with R32 (Adaptability of tools that are for use with R410A, R22, or R407C)
1. To be used exclusively with R32 (not to be used if used with R410A, R22, or R407C)
2. Tools and materials that may be used with R32 with some restrictions
3. Tools and materials that are used with R22, R407C, or R410A that may also be used with R32
4. Tools and materials that must not be used with R32
Tools for R32 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 light blue.
Charging Port on the Refrigerant Cylinder Refrigerant charging The charge port diameter is larger
than that of the current port.
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.
Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with R32.
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
ø12.7 (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
Tools containing abrasive materials Pipe cutting, cut edge treatment Prohibited to use
0000006448.BOOK 2 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
BS_01_L chapter 1 - 3
1 Check Before Servicing
1-2 Handling and Characteristics of Piping Materials,
Refrigerant, and Refrigerant Oil
1-2-1 Piping Materials
1. Copper pipe materials
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
3. Piping materials/Radial thickness
Use refrigerant pipes made of phosphorus deoxidized copper.
The operation pressure of the units that use R32 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.)
Annealed pipes have been used for older model units when a diameter of the pipe is up to φ19.05 (3/4"). For a system that
uses R410A or R32, use pipes that are made with 1/2H-material (Drawn). (Annealed pipes may be used for pipes with a di-
ameter of φ19.05 (3/4") and a radial thickness of 1.2 t).
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.
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.
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.
Maximum working pressure Refrigerant type
3.45 MPa [500psi] R22, R407C etc.
4.30 MPa [624psi] R410A, R32 etc.
Pipe size (mm[in]) Radial thickness (mm) Type
ø6.35 [1/4"] 0.8t
O-material (Annealed)
ø9.52 [3/8"] 0.8t
ø12.7 [1/2"] 0.8t
ø15.88 [5/8"] 1.0t
ø19.05 [3/4"] 1.0t
1/2H-material,
H-material (Drawn)
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"] 1.2t
ø41.28 [1-5/8"] 1.4t
Do not use the existing piping!
0000006448.BOOK 3 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
4 - chapter 1 BS_01_L
1 Check Before Servicing
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.
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.
Refrigerant oil is highly hygroscopic and is likely to degrade and cause compressor failure if moisture infiltrates into the sys-
tem. Storage of piping materials requires stringent management.
1-2-3 Pipe Processing
Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Prevent the particles that are generated during pipe cutting or cut edge treatment from entering the pipes. If abrasive materials
contained in sandpaper or cutting tools enter the refrigerant circuit, they may cause the compressor, valves, or other refrigerant
circuit components to fail.
Use a minimum amount of oil.
Use only ester oil, ether oil, and alkylbenzene.
To deburr pipes, use a reamer or other deburring tools, not sandpaper.
To cut pipes, use a pipe cutter, not a grinder or other tools that use abrasive materials.
When cutting or deburring pipes, do not allow cutting chips or other foreign matters to enter the pipes.
If cutting chips or other foreign matters enter pipes, wipe them off the inside of the pipes.
0000006448.BOOK 4 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
BS_01_L chapter 1 - 5
1 Check Before Servicing
1-2-4 Differences in Refrigerant Properties
1. Chemical property
Refrigerant R32 is as low in toxicity and slightly flammable 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.
Because the refrigerant is slightly flammable, do not perform installation or service work in a confined area.
*1 When CFC11 is used as a reference
*2 When CO2is used as a reference
2. Refrigerant composition
R32 is a single refrigerant and can be handled in a similar manner as with other single refrigerants, such as R22.
If the refrigerant leaks out, it may be replenished.
3. Pressure characteristics
The pressure in the system using R32 is 1.6 times as great as that in the system using R22.
HFC Refrigerant HCFC Refrigerant
R32 R410A R407C R22
R32 R32/R125 R32/R125/R134a R22
Composition (wt%) (100) (50/50) (23/25/52) (100)
Type of Refrigerant Single Refrigerant Pseudo-azeotropic
Refrigerant
Non-azeotropic
Refrigerant
Single Refrigerant
Chloride Not included Not included Not included Included
Safety Class A2L A1/A1 A1/A1 A1
Molecular Weight 52.0 72.6 86.2 86.5
Boiling Point (°C/°F) -51.7/-61.0 -51.4/-60.5 -43.6/-46.4 -40.8/-41.4
Steam Pressure
(25°C,MPa/77°F,psi) (gauge)
1.588/230 1.557/226 0.9177/133 0.94/136
Saturated Steam Density
(25°C,kg/m3/77°F,psi)
47.4 64.0 42.5 44.4
Flammability Slightly flammable Nonflammable Nonflammable Nonflammable
Ozone Depletion Coefficient
(ODP)*1 0 0 0 0.055
Global Warming Coefficient
(GWP)*2 675 2088 1774 1810
Refrigerant Charging Method Refrigerant charging
in the liquid state/re-
frigerant charging in
the gaseous state
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 Available
Temperature (°C/°F)
Pressure (gauge)
R32 R410A R407C R22
MPa/psi MPa/psi MPa/psi MPa/psi
-20/-4 0.30/44 0.30/44 0.18/26 0.14/20
0/32 0.71/103 0.70/102 0.47/68 0.40/58
20/68 1.37/199 1.34/194 0.94/136 0.81/117
40/104 2.38/345 2.31/335 1.44/209 1.44/209
60/140 3.83/555 3.73/541 2.44/354 2.33/338
65/149 4.28/621 4.17/605 2.75/399 2.60/377
0000006448.BOOK 5 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
6 - chapter 1 BS_01_L
1 Check Before Servicing
1-2-5 Precautions for handling equipment using R32
When handling the units that use R32 refrigerant, observe the following notes. (The notes are based on the precautions re-
garding R32 refrigerant contained in IEC 60335-2-40.)
1. Transportation
1) Additional transportation regulations may exist with respect to equipment containing slightly flammable gas. The maximum
number of pieces of equipment or the configuration of the equipment, permitted to be transported together will be determined
by the applicable transport regulations.
2. Disposal
1) Follow the local regulations on proper disposal of equipment using R32.
3. Storage
1) Store the unit in a sufficiently large space so that leaked refrigerant will not stagnate in a small confined area.
2) The maximum number of pieces of equipment permitted to be stored together will be determined local regulations.
4. Servicing information
1) Checks to the area
Prior to beginning work on systems containing slightly flammable refrigerants, safety checks are necessary to ensure that the
risk of ignition is minimised. For repair to the refrigerating system, 3) to 7) shall be completed prior to conducting work on the
system.
2) Work procedure
Work shall be undertaken under a controlled procedure so as to minimise the risk of a slightly flammable gas being present
while the work is being performed.
3) General work area
All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out. Work in
confined spaces shall be avoided. The area around the workspace shall be sectioned off. Ensure that the conditions within
the area have been made safe by control of flammable material.
4) Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware
of potentially slightly flammable atmospheres. Ensure that the leak detection equipment being used is suitable for use with all
applicable refrigerants.
5) Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equip-
ment shall be available to hand. Have a dry powder or CO2fire extinguisher adjacent to the charging area.
6) No ignition sources
No person carrying out work, such as brazing, in relation to a refrigeration system which involves exposing any pipe work shall
use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, in-
cluding cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal,
during which refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area around the
equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks. ''No Smoking'' signs shall be
displayed in a conspicuous place in the work area.
0000006448.BOOK 6 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
BS_01_L chapter 1 - 7
1 Check Before Servicing
7) Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before replacing parts or conducting any hot work. A
degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any
released refrigerant and preferably expel it externally into the atmosphere.
8) Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times
the MITSUBISHI ELECTRIC's Installation Manual and Service Handbook shall be followed. If in doubt, consult the dealer's
technical department for assistance.
The following checks shall be applied to installations using slightly flammable refrigerants:
the amount of refrigerant charge depends on the size of the area in which products containing refrigerant are to be installed;
the ventilation machinery and outlets are operating adequately and are not obstructed;
if an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant;
marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be corrected;
refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance which may
corrode components containing refrigerant, unless the components are constructed of materials which are inherently resistant
to being corroded or are suitably protected being so corroded.
9) Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If
a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily
dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solu-
tion shall be used. This shall be reported to the owner of the equipment so all parties are advised.
10) Initial safety checks shall include:
that capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking;
that no live electrical components and wiring are exposed while charging, recovering or purging the system;
that there is continuity of earth bonding.
5. Repairing sealed components
1) During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior
to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing,
then a permanently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous
situation.
2) Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered
in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections,
terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.
3) Ensure that the apparatus is mounted securely.
4) Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of preventing the
ingress of flammable atmospheres. Replacement parts shall be in accordance with the MITSUBISHI ELECTRIC's specifica-
tions.
5) The use of silicon sealant can inhibit the effectiveness of some types of leak detection equipment. Intrinsically safe compo-
nents do not have to be isolated prior to working on them.
6. Refrigerant leakage detection
The following leak detection methods are deemed acceptable for all refrigerant systems.
1) Electronic leak detectors may be used to detect refrigerant leaks but, in the case of slightly flammable refrigerants, the sensi-
tivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.)
Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
2) If a leak is suspected, all naked flames shall be removed/extinguished.
3) If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated
(by means of shut off valves) in a part of the system remote from the leak. Because R32 is slightly flammable, oxygen free
nitrogen (OFN) shall be poured through the system both before and during the brazing process to purge R32.
0000006448.BOOK 7 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
8 - chapter 1 BS_01_L
1 Check Before Servicing
7. Refrigerant removal and vacuum drying for service
1) R32 is slightly flammable. Follow the procedures below to reduce the risk of R32 from catching fire:
1. Remove refrigerant;
2. Purge the circuit with inert gas;
3. Evacuate;
4. Purge again with inert gas;
5. Open the circuit by cutting or brazing.
2) The charged refrigerant shall be recovered into the recovery cylinders designated for use with R32. For appliances containing
slightly flammable refrigerants, the system shall be "flushed" with OFN to render the unit safe. This process may need to be
repeated several times. Compressed air or oxygen shall not be used for purging refrigerant systems.
3) Because R32 is slightly flammable, flushing shall be achieved by breaking the vacuum in the system with OFN and continuing
to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum. This process
shall be repeated until no refrigerant is within the system. When the final OFN charge is used, the system shall be vented
down to atmospheric pressure to enable work to take place. This operation is absolutely vital if brazing operations on the pipe-
work are to take place.
4) Ensure that the outlet for the vacuum pump is not close to any ignition sources and that ventilation is available.
8. Decommissioning
1) Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail.
It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and re-
frigerant sample shall be taken in case analysis is required prior to re-use of reclaimed refrigerant. It is essential that electrical
power is available before the task is commenced.
2) Become familiar with the equipment and its operation.
3) Isolate system electrically.
4) Before attempting the procedure, ensure that:
mechanical handling equipment is available, if required, for handling refrigerant cylinders;
all personal protective equipment is available and being used correctly;
the recovery process is supervised at all times by a competent person;
recovery equipment and cylinders conform to the appropriate standards.
5) Pump down refrigerant system, if possible.
6) Make sure that cylinder is situated on the scales before recovery takes place.
7) Start the recovery machine and operate in accordance with MITSUBISHI ELECTRIC's instructions.
8) Do not overfill cylinders. (No more than 80% volume liquid charge)
9) Do not exceed the maximum working pressure of the cylinder, even temporarily.
10) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment
are removed from site promptly and all isolation valves on the equipment are closed off.
11) Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.
9. Labelling
1) Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and
signed. Because R32 is slightly flammable, ensure that there are labels on the equipment stating the equipment contains flam-
mable refrigerant.
0000006448.BOOK 8 ページ ２０２１年１０月６日 水曜日 午後１時５７分

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
BS_01_L chapter 1 - 9
1 Check Before Servicing
10. Appropriate refrigerant recovery method
1) When removing refrigerant from a system, either for repairing or decommissioning, it is recommended good practice that all
refrigerants are removed safely.
2) When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure
that the correct number of cylinders for holding the total system charge are available. All cylinders to be used are designated
for recovering refrigerant and labelled for that refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders shall
be complete with pressure-relief valve and associated shut-off valves in good working order. Empty recovery cylinders are
evacuated and, if possible, cooled before recovery starts.
3) The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and
shall be suitable for the recovery of all appropriate refrigerants including, when applicable, slightly flammable refrigerants. In
addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak-
free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working
order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event
of a refrigerant release. Consult dealer if in doubt.
4) The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant waste
transfer note arranged. Do not mix refrigerants with different properties in recovery units and especially not in cylinders.
5) If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make
certain that slightly flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out
prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accel-
erate this process. When oil is drained from a system, it shall be carried out safely.
11. Competence of service personnel
(1) General
Special training additional to usual refrigerating equipment repair procedures is required when equipment with slightly flam-
mable refrigerants is affected.
(2) Training
The training should include the substance of the following:
Information about the explosion potential of slightly flammable refrigerants to show that flammables may be dangerous when
handled without care.
(3) Information about the correct working procedures
Commissioning
1) Ensure that the floor area is sufficient for the refrigerant charge or that the ventilation duct is assembled in a correct manner.
2) Connect the pipes and carry out a leak test before charging with refrigerant.
3) Check safety equipment before putting into service.
Maintenance
1) Portable equipment shall be repaired outside or in a workshop specially equipped for servicing units with slightly flammable
refrigerants.
2) Ensure sufficient ventilation at the repair place.
3) Be aware that malfunction of the equipment may be caused by refrigerant loss and a refrigerant leak is possible.
4) Discharge capacitors in a way that won't cause any spark. The standard procedure to short circuit the capacitor terminals usu-
ally creates sparks.
5) Reassemble sealed enclosures accurately. If seals are worn, replace them.
6) Check safety equipment before putting into operation.
7) Carry a portable refrigerant-leak sensor when entering a space with a risk of refrigerant leakage.
0000006448.BOOK 9 ページ ２０２１年１０月６日 水曜日 午後１時５７分