Mitsubishi Electric CMB-WP1016V-GA1, CMB-WP108V-GA1, CMB-WP108V-GB1, CMB-WP1016V-GB1 Service Manual
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HWE1410A GB
Safety Precautions
Before installing the unit, thoroughly read the following safety precautions.
Observe these safety precautions for your safety.
WARNING
This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid
the risk of serious injury or death.
CAUTION
This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid
the risk of serious injury or damage to the unit.
After reading this manual, give it to the user to retain for future reference.
Keep this manual for easy reference. When the unit is moved or repaired, give this manual to those who provide these
services.
When the user changes, make sure that the new user receives this manual.
WARNING
Do not use refrigerant other than the type indicated in
the manuals provided with the unit and on the nameplate.
Doing so may cause the unit or pipes to burst, or result in
explosion or fire during use, during repair, or at the time of
disposal of the unit.
It may also be in violation of applicable laws.
MITSUBISHI ELECTRIC CORPORATION cannot be held
responsible for malfunctions or accidents resulting from the
use of the wrong type of refrigerant.
Ask your dealer or a qualified technician to install the
unit.
Improper installation by the user may result in water leakage, electric shock, smoke, and/or fire.
Properly install the unit on a surface that can withstand the weight of the unit.
Unit installed on an unstable surface may fall and cause injury.
Only use specified cables. Securely connect each cable so that the terminals do not carry the weight of the
cable.
Improperly connected or fixed cables may produce heat
and start a fire.
Take appropriate safety measures against strong
winds and earthquakes to prevent the unit from falling.
If the unit is not installed properly, the unit may fall and
cause serious injury to the person or damage to the unit.
Do not make any modifications or alterations to the
unit. Consult your dealer for repair.
Improper repair may result in water leakage, electric shock,
smoke, and/or fire.
Do not touch the heat exchanger fins.
The fins are sharp and dangerous.
In the event of a refrigerant leak, thoroughly ventilate
the room.
If refrigerant gas leaks and comes in contact with an open
flame, poisonous gases will be produced.
Properly install the unit according to the instructions
in the installation manual.
Improper installation may result in water leakage, electric
shock, smoke, and/or fire.
Have all electrical work performed by an authorized
electrician according to the local regulations and instructions in this manual, and a dedicated circuit must
be used.
Insufficient capacity of the power supply circuit or improper
installation may result in malfunctions of the unit, electric
shock, smoke, and/or fire.
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WARNING
Securely attach the terminal block cover (panel) to the
unit.
If the terminal block cover (panel) is not installed properly,
dust and/or water may infiltrate and pose a risk of electric
shock, smoke, and/or fire.
Only use the type of refrigerant that is indicated on the
unit when installing or reinstalling the unit.
Infiltration of any other type of refrigerant or air into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.
When installing the unit in a small room, exercise caution and take measures against leaked refrigerant
reaching the limiting concentration.
Consult your dealer with any questions regarding limiting
concentrations and for precautionary measures before installing the unit. Leaked refrigerant gas exceeding the limiting concentration causes oxygen deficiency.
Consult your dealer or a specialist when moving or reinstalling the unit.
Improper installation may result in water leakage, electric
shock, and/or fire.
After completing the service work, check for a gas
leak.
If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, poisonous gases may be
produced.
Do not try to defeat the safety features of the unit.
Forced operation of the pressure switch or the temperature
switch by defeating the safety features of these devices, or
the use of accessories other than the ones that are recommended by MITSUBISHI may result in smoke, fire, and/or
explosion.
Only use accessories recommended by MITSUBISHI.
Ask a qualified technician to install the unit. Improper installation by the user may result in water leakage, electric
shock, smoke, and/or fire.
Control box houses high-voltage parts.
When opening or closing the front panel of the control box,
do not let it come into contact with any of the internal components. Before inspecting the inside of the control box,
turn off the power, keep the unit off for at least 10 minutes,
and confirm that the voltage between FT-P and FT-N on
INV Board has dropped to DC20V or less. (It takes about
10 minutes to discharge electricity after the power supply is
turned off.)
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Precautions for handling units for use with R410A
CAUTION
Do not use the existing refrigerant piping.
A large amount of chlorine that may be contained in the re-
sidual refrigerant and refrigerating machine oil in the existing piping may cause the refrigerating machine oil in the
new unit to deteriorate.
R410A is a high-pressure refrigerant and can cause the
existing pipes to burst.
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.
Store the pipes to be installed indoors, and keep both
ends of the pipes sealed until immediately before brazing. (Keep elbows and other joints wrapped in plastic.)
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate or
cause the unit to malfunction.
Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Infiltration of a large amount of mineral oil may cause the refrigerating machine oil to deteriorate.
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and
may result in performance loss.
Use a vacuum pump with a reverse-flow check valve.
If a vacuum pump that is not equipped with a reverse-flow
check valve is used, the vacuum pump oil may flow into the
refrigerant cycle and cause the refrigerating machine oil to
deteriorate.
Prepare tools for exclusive use with R410A. Do not use
the following tools if they have been used with the conventional refrigerant (gauge manifold, charging hose,
gas leak detector, reverse-flow check valve, refrigerant
charge base, vacuum gauge, and refrigerant recovery
equipment.).
If the refrigerant or the refrigerating machine oil left on
these tools are mixed in with R410A, it may cause the refrigerating machine oil to deteriorate.
Infiltration of water may cause the refrigerating machine
oil to deteriorate.
Gas leak detectors for conventional refrigerants will not
detect an R410A leak because R410A is free of chlorine.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of the refrigerant will change, and the unit may experience power loss.
Exercise special care when handling the tools for use
with R410A.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate.
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Before installing the unit
WARNING
Do not install the unit where a gas leak may occur.
If gaseous refrigerant leaks and piles up around the unit, it
may be ignited.
Do not use the unit to keep food items, animals, plants,
artifacts, or for other special purposes.
The unit is not designed to preserve food products.
Do not use the unit in an unusual environment.
Do not install the unit where a large amount of oil or steam
is present or where acidic or alkaline solutions or chemical
sprays are used frequently. Doing so may lead to a remarkable drop in performance, electric shock, malfunctions, smoke, and/or fire.
The presence of organic solvents or corrosive gas (i.e.
ammonia, sulfur compounds, and acid) may cause gas
leakage or water leakage.
When installing the unit in a hospital, take appropriate
measures to reduce noise interference.
High-frequency medical equipment may interfere with the
normal operation of the air conditioner or vice versa.
Do not install the unit on or over things that cannot get
wet.
When the humidity level exceeds 80% or if the drainage
system is clogged, the indoor unit may drip water. Drain water is also discharged from the outdoor unit. Install a centralized drainage system if necessary.
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Before installing the unit (moving and reinstalling the unit) and performing
electrical work
CAUTION
Properly ground the unit.
Do not connect the grounding wire to a gas pipe, water pipe,
lightning rod, or grounding wire from a telephone pole. Improper grounding may result in electric shock, smoke, fire,
and/or malfunction due to noise interference.
Do not put tension on the power supply wires.
If tension is put on the wires, they may break and result in
excessive heat, smoke, and/or fire.
Install an earth leakage breaker to avoid the risk of
electric shock.
Failure to install an earth leakage breaker may result in
electric shock, smoke, and/or fire.
Use the kind of power supply wires that are specified
in the installation manual.
The use of wrong kind of power supply wires may result in
current leak, electric shock, and/or fire.
Use breakers and fuses (current breaker, remote
switch <switch + Type-B fuse>, moulded case circuit
breaker) with the proper current capacity.
The use of wrong capacity fuses, steel wires, or copper
wires may result in malfunctions, smoke, and/or fire.
Do not spray water on the air conditioner or immerse
the air conditioner in water.
Otherwise, electric shock and/or fire may result.
When handling units, always wear protective gloves to
protect your hands from metal parts and high-temperature parts.
Periodically check the installation base for damage.
If the unit is left on a damaged platform, it may fall and
cause injury.
Properly install the drain pipes according to the instructions in the installation manual. Keep them insulated to avoid dew condensation.
Improper plumbing work may result in water leakage and
damage to the furnishings.
Exercise caution when transporting products.
Products weighing more than 20 kg should not be carried
alone.
Do not carry the product by the PP bands that are used on
some products.
Do not touch the heat exchanger fins. They are sharp and
dangerous.
When lifting the unit with a crane, secure all four corners
to prevent the unit from falling.
Properly dispose of the packing materials.
Nails and wood pieces in the package may pose a risk of
injury.
Plastic bags may pose a risk of choking hazard to chil-
dren. Tear plastic bags into pieces before disposing of
them.
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Before the test run
CAUTION
Turn on the unit at least 12 hours before the test run.
Keep the unit turned on throughout the season. If the unit is
turned off in the middle of a season, it may result in malfunctions.
To avoid the risk of electric shock or malfunction of the
unit, do not operate switches with wet hands.
Do not touch the refrigerant pipes with bare hands during and immediately after operation.
During or immediately after operation, certain parts of the
unit such as pipes and compressor may be either very cold
or hot, depending on the state of the refrigerant in the unit
at the time. To reduce the risk of frost bites and burns, do
not touch these parts with bare hands.
Do not operate the unit without panels and safety
guards.
Rotating, high-temperature, or high-voltage parts on the unit
pose a risk of burns and/or electric shock.
Do not turn off the power immediately after stopping
the operation.
Keep the unit on for at least five minutes before turning off
the power to prevent water leakage or malfunction.
Do not operate the unit without the air filter.
Dust particles may build up in the system and cause malfunctions.
Use circulation and makeup water that meet the waterquality standards.
Degradation of water quality can result in water leakage.
In areas where temperature drops to freezing during
the periods of non-use, blow the water out of the pipes
or fill the pipes with anti-freeze solution.
Not doing so may cause the water to freeze, resulting in
burst pipes and damage to the unit or the furnishings.
CONTENTS
HWE1410A GB
I Read Before Servicing
[1] Read Before Servicing.............................................................................................................. 3
[2] Necessary Tools and Materials ................................................................................................ 4
[3] Piping Materials ........................................................................................................................ 5
[4] Storage of Piping ...................................................................................................................... 7
[5] Pipe Processing........................................................................................................................ 7
[6] Brazing...................................................................................................................................... 8
[7] Air Tightness Test (Refrigerant Circuit) ....................................................................................9
[8] Vacuum Drying (Evacuation) (Refrigerant Circuit).................................................................. 10
[9] Refrigerant Charging .............................................................................................................. 12
[10] Remedies to be taken in case of a Refrigerant Leak............................................................ 12
[11] Characteristics of the Conventional and the New Refrigerants ............................................ 13
[12] Notes on Refrigerating Machine Oil...................................................................................... 14
[13] Water piping.......................................................................................................................... 15
II Restrictions
[1] System configuration .............................................................................................................. 21
[2] Switch Settings and Address Settings .................................................................................... 22
[3] An Example of a System to which an MA Remote Controller is connected ........................... 24
[4] An Example of a System to which an ME Remote Controller is connected ........................... 30
[5] An Example of a System to which both MA Remote Controller and ME Remote
Controller are connected ........................................................................................................32
[6] Restrictions on Pipe Length.................................................................................................... 35
III HBC Controller Components
[1] HBC Controller Components .................................................................................................. 39
[2] Sub-HBC Components ........................................................................................................... 42
[3] Control Box of the HBC Controller and Sub-HBC................................................................... 44
[4] HBC Controller and Sub-HBC Circuit Board........................................................................... 45
IV Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the HBC Controller and Sub-HBC ............................................. 49
[2] Electrical Wiring Diagram of Transmission Booster................................................................ 57
V Refrigerant Circuit
[1] Refrigerant Circuit Diagram .................................................................................................... 61
[2] Principal Parts and Functions ................................................................................................. 64
VI Control
[1] Functions and Factory Settings of the Dipswitches ................................................................ 69
[2] Controlling HBC Controller ..................................................................................................... 70
[3] Operation Flow Chart.............................................................................................................. 79
VII Test Run Mode
[1] Items to be checked before a Test Run.................................................................................. 87
[2] Operating Characteristic and Refrigerant Amount.................................................................. 88
[3] Adjusting the Refrigerant Amount........................................................................................... 88
[4] Refrigerant Amount Adjust Mode............................................................................................ 91
[5] The following symptoms are normal. ...................................................................................... 91
[6] Standard Operation Data (Reference Data) ........................................................................... 92
VIII Troubleshooting
[1] Error Code Lists.................................................................................................................... 111
[2] Responding to Error Display on the Remote Controller........................................................ 115
[3] Investigation of Transmission Wave Shape/Noise ............................................................... 163
[4] Troubleshooting Principal Parts ............................................................................................ 166
[5] Refrigerant Leak ................................................................................................................... 176
[6] Servicing the HBC controller................................................................................................. 178
[7] Instructions for debris removal operation.............................................................................. 180
[8] Instructions for the air vent operation ................................................................................... 181
[9] Instructions for the water pump replacement........................................................................ 182
IX LED Monitor Display on the Outdoor Unit Board
[1] How to Read the LED on the Service Monitor ...................................................................... 201
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I Read Before Servicing
[1] Read Before Servicing ....................................................................................................... 3
[2] Necessary Tools and Materials.......................................................................................... 4
[3] Piping Materials ................................................................................................................. 5
[4] Storage of Piping ............................................................................................................... 7
[5] Pipe Processing................................................................................................................. 7
[6] Brazing............................................................................................................................... 8
[7] Air Tightness Test (Refrigerant Circuit).............................................................................. 9
[8] Vacuum Drying (Evacuation) (Refrigerant Circuit)........................................................... 10
[9] Refrigerant Charging........................................................................................................ 12
[10] Remedies to be taken in case of a Refrigerant Leak .......................................................12
[11] Characteristics of the Conventional and the New Refrigerants ....................................... 13
[12] Notes on Refrigerating Machine Oil ................................................................................. 14
[13] Water piping..................................................................................................................... 15
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[ I Read Before Servicing ]
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I Read Before Servicing
[1] Read Before Servicing
1. Check the type of refrigerant used in the system to be serviced.
Refrigerant Type
Multi air conditioner for building application CITY MULTI R2 YLM series: R410A
2. Check the symptoms exhibited by the unit to be serviced.
Refer to this service handbook for symptoms relating to the refrigerant cycle.
3. Thoroughly read the safety precautions at the beginning of this manual.
4. Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant.
Refer to "Necessary Tools and Materials" for information on the use of tools.(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.
CAUTION
Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
The use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.
[ I Read Before Servicing ]
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[2] Necessary Tools and Materials
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)
2. Tools and materials that may be used with R410A with some restrictions
3. Tools and materials that are used with R22 or R407C that may also be used with R410A
4. Tools and materials that must not be used with R410A
Tools for R410A must be handled with special care to keep moisture and dust from infiltrating the cycle.
Tools/Materials Use Notes
Gauge Manifold Evacuation and refrigerant charging Higher than 5.09MPa[738psi] on the
high-pressure side
Charging Hose Evacuation and refrigerant charging The hose diameter is larger than the
conventional model.
Refrigerant Recovery Cylinder Refrigerant recovery
Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The
cylinder is pink.
Charging Port on the Refrigerant Cylinder Refrigerant charging The charge port diameter is larger
than that of the current port.
Flare Nut Connection of the unit with the pipes Use Type-2 Flare nuts.
Tools/Materials Use Notes
Gas Leak Detector Gas leak detection The ones for use with HFC refrigerant
may be used.
Vacuum Pump Vacuum drying May be used if a check valve adapter
is attached.
Flare Tool Flare processing Flare processing dimensions for the
piping in the system using the new refrigerant differ from those of R22. Refer to I [3] Piping Materials.
Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with
R410A.
Tools/Materials Use Notes
Vacuum Pump with a Check Valve Vacuum drying
Bender Bending pipes
Torque Wrench Tightening flare nuts Only the flare processing dimensions
for pipes that have a diameter of
ø12.7 (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
[ I Read Before Servicing ]
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[3] Piping Materials
1. Copper pipe materials
The distinction between O-materials (Soft Annealed) and 1/2H-materials (Light Annealed) is made based on the strength of
the pipes themselves.
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 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.)
For the models for use with R410A, pipes made with O-material (soft annealed) cannot be used unless they have a diameter
of at least ø19.05 (3/4") and a radial thickness of 1.2 t. Use pipes made with 1/2H-material (light annealed).
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 (Soft Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands.
1/2H-material (Light Annealed) Hard copper pipes (straight pipes). They are stronger than the O-material (Soft An-
nealed) at the same radial thickness.
Maximum working pressure Refrigerant type
3.45 MPa [500psi] R22, R407C etc.
4.30 MPa [624psi] R410A etc.
Pipe size (mm[in]) Radial thickness (mm) Type
ø6.35 [1/4"] 0.8t
O-material (Soft 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
(Light Annealed, Skin Hard)
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!
[ I Read Before Servicing ]
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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 (Soft 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.
(ø19.05 pipes should have a radial thickness of 1.2 t and be made of annealed materials.)
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.
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.
Flare processing dimensions (mm[in])
Pipe size (mm[in])
A dimension (mm)
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
Flare nut dimensions (mm[in])
Pipe size (mm[in])
B dimension (mm)
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
Dimension A
Dimension B
[ I Read Before Servicing ]
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HWE1410A GB
[4] Storage of Piping
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.
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.
[5] Pipe Processing
Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Use a minimum amount of oil.
Use only ester oil, ether oil, and alkylbenzene.
[ I Read Before Servicing ]
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HWE1410A GB
[6] Brazing
No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide
scale, water, and dust) out of the refrigerant system.
Example: Inside the brazed connection
1. Items to be strictly observed
Do not conduct refrigerant piping work outdoors if raining.
Use non-oxidized solder.
Use a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and
copper coupling.
If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
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.
Use of oxidized solder for brazing Use of non-oxidized solder for brazing
[ I Read Before Servicing ]
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[7] Air Tightness Test (Refrigerant Circuit)
No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak.
1. Items to be strictly observed
Pressurize the 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.
Halide torch R22 leakage detector
[ I Read Before Servicing ]
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HWE1410A GB
[8] Vacuum Drying (Evacuation) (Refrigerant Circuit)
1. Vacuum pump with a reverse-flow check valve (Photo1)
To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum
pump with a reverse-flow check valve.
A reverse-flow check valve may also be added to the vacuum pump currently in use.
2. Standard of vacuum degree (Photo 2)
Use a vacuum pump that attains 0.5Torr(65Pa) or lower degree of vacuum after 5 minutes of operation, and connect it directly
to the vacuum gauge. Use a pump well-maintained with an appropriate lubricant. A poorly maintained vacuum pump may not
be able to attain the desired degree of vacuum.
3. Required precision of vacuum gauge
Use a vacuum gauge that registers a vacuum degree of 5Torr(650Pa) and measures at intervals of 1Torr(130Pa). (A recommended vacuum gauge is shown in Photo2.)
Do not use a commonly used gauge manifold because it cannot register a vacuum degree of 5Torr(650Pa).
4. Evacuation time
After the degree of vacuum has reached 5Torr(650Pa), evacuate for an additional 1 hour. (A thorough vacuum drying re-
moves moisture in the pipes.)
Verify that the vacuum degree has not risen by more than 1Torr(130Pa) 1hour after evacuation. A rise by less than
1Torr(130Pa) is acceptable.
If the vacuum is lost by more than 1Torr(130Pa), conduct evacuation, following the instructions in section 6. Special vacuum
drying.
5. Procedures for stopping vacuum pump
To prevent the reverse flow of vacuum pump oil, open the relief valve on the vacuum pump side, or draw in air by loosening
the charge hose, and then stop the operation.
The same procedures should be followed when stopping a vacuum pump with a reverse-flow check valve.
6. Special vacuum drying
When 5Torr(650Pa) or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has pen-
etrated the system or that there is a leak.
If water infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to
0.5kgf/cm
2
G(0.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree of vac-
uum below 5Torr(650Pa) is attained or until the pressure stops rising.
Only use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)
(Photo1) 15010H (Photo2) 14010
Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge
[ I Read Before Servicing ]
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HWE1410A GB
7. Notes
To evacuate air from the entire system
Applying a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1
and 2) is not enough to attain the desired vacuum pressure.
Be sure to apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure
sides (BV1 and 2) and also through the check joints on the high and low pressure sides (CJ1 and 2).
To evacuate air only from the outdoor units
Apply a vacuum through the check joints on the high and low pressure sides (CJ1, and 2).
Open the valves in the HBC controller, and switch on the power to the outdoor units, HBC controllers, and indoor
units before performing evacuation so that all refrigerant circuits will be open. (By switching on the power to the indoor units, normal M-NET communication will be maintained.)
[ I Read Before Servicing ]
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HWE1410A GB
[9] Refrigerant Charging
1. Reasons
R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be 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.
[10] Remedies to be taken in case of a Refrigerant Leak
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced. (Charge refrigerant in the
liquid state.)
Refer to "VIII [5] Refrigerant Leak."(page 176)
Cylinder with a siphon
Cylinder color R410A is pink. Refrigerant charging in the liquid state
Cylinder
liquid
Valve Valve
liquid
Cylinder
Cylinder without a siphon
[ I Read Before Servicing ]
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HWE1410A GB
[11] Characteristics of the Conventional and the New Refrigerants
1. Chemical property
As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant.
However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will
accumulate at the bottom of the room and may cause hypoxia.
If exposed to an open flame, refrigerant will generate poisonous gases. Do not perform installation or service work in a confined area.
*1 When CFC11 is used as a reference
*2 When CO
2
is used as a reference
2. Refrigerant composition
R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To
be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn
out, the composition of the remaining refrigerant will change and become unsuitable for use.
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced.
3. Pressure characteristics
The pressure in the system using R410A is 1.6 times as great as that in the system using R22.
New Refrigerant (HFC type) Conventional Refriger-
ant (HCFC type)
R410A R407C R22
R32/R125 R32/R125/R134a R22
Composition (wt%) (50/50) (23/25/52) (100)
Type of Refrigerant Pseudo-azeotropic
Refrigerant
Non-azeotropic
Refrigerant
Single Refrigerant
Chloride Not included Not included Included
Safety Class A1/A1 A1/A1 A1
Molecular Weight 72.6 86.2 86.5
Boiling Point (°C/°F) -51.4/-60.5 -43.6/-46.4 -40.8/-41.4
Steam Pressure
(25°C,MPa/77°F,psi) (gauge)
1.557/226 0.9177/133 0.94/136
Saturated Steam Density
(25°C,kg/m3/77°F,psi)
64.0 42.5 44.4
Flammability Nonflammable Nonflammable Nonflammable
Ozone Depletion Coefficient (ODP)
*1
0 0 0.055
Global Warming Coefficient (GWP)
*2
2090 1774 1810
Refrigerant Charging Method Refrigerant charging in
the liquid state
Refrigerant charging in
the liquid state
Refrigerant charging in
the gaseous state
Replenishment of Refrigerant after a Refrigerant
Leak
Available Available Available
Temperature (°C/°F)
Pressure (gauge)
R410A R407C R22
MPa/psi MPa/psi MPa/psi
-20/-4 0.30/44 0.18/26 0.14/20
0/32 0.70/102 0.47/68 0.40/58
20/68 1.34/194 0.94/136 0.81/117
40/104 2.31/335 1.44/209 1.44/209
60/140 3.73/541 2.44/354 2.33/338
65/149 4.17/605 2.75/399 2.60/377
[ I Read Before Servicing ]
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HWE1410A GB
[12] Notes on Refrigerating Machine Oil
1. Refrigerating machine oil in the HFC refrigerant system
HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system.
Note that the ester oil used in the system has properties that are different from commercially available ester oil.
2. Effects of contaminants
*1
Refrigerating machine oil used in the HFC system must be handled with special care to keep contaminants out.
The table below shows the effect of contaminants in the refrigerating machine oil on the refrigeration cycle.
3. The effects of contaminants in the refrigerating machine oil on the refrigeration cycle.
Refrigerant Refrigerating machine oil
R22 Mineral oil
R407C Ester oil
R410A Ester oil
*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.
Cause Symptoms Effects on the refrigerant cycle
Water infiltration Frozen expansion valve
and capillary tubes
Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Motor insulation failure
Burnt motor
Coppering of the orbiting scroll
Lock
Burn-in on the orbiting scroll
Hydrolysis
Sludge formation and adhesion
Acid generation
Oxidization
Oil degradation
Air infiltration Oxidization
Infiltration of
contaminants
Dust, dirt
Adhesion to expansion valve and capillary
tubes
Clogged expansion valve, capillary tubes, and
drier
Poor cooling performance
Compressor overheat
Infiltration of contaminants into the compressor
Burn-in on the orbiting scroll
Mineral oil
etc.
Sludge formation and adhesion Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Oil degradation Burn-in on the orbiting scroll
[ I Read Before Servicing ]
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HWE1410A GB
[13] Water piping
1. Precautions for water piping
Consider the following when installing a water piping system.
(1) Design pressure of the water piping
Use a water pipe that can withstand pressure of at least 1.0 MPa.
(2) Water pipe type
Use of plastic pipe is recommended.Do not use chloride plastic pipes.
When using copper pipes, be sure to braze the pipes under a nitrogen purge. (Oxidation during may shorten the life of the
pump.)
(3) Expansion tank
Install an expansion tank to accommodate expanded water.
(4) Drain piping
Install the drain pipe with a downward inclination of between 1/100 and 1/200. To prevent drain water from freezing in winter,
install the drain pipe as steep an angle as practically possible and minimize the straight line. For cold climate installation, take
an appropriate measure (e.g., drain heater) to prevent the drain water from freezing.
(5) Insulation
Cover the water pipe with insulating materials with the specified thickness or more to prevent thermal loss or condensation
from collecting.
(6) Air vent valve
Install air vent valves to the highest places where air can accumulate.
(7) Maintenance valve
It is recommended to install valves on the inlet/outlet for each HBC controller branch for maintenance.
(8) Water pressure gauge
Install a water pressure gauge to check the charged pressure.
(9) Water pipe connection
When connecting to water pipe, be sure to make the connection in accordance with the relevant local laws and regulations.
[ I Read Before Servicing ]
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HWE1410A GB
2. Notes on corrosion
(1) Water quality
It is important to check the water quality beforehand. See table below (Circulating water/Makeup Water Quality Standards).
(2) Debris in the water
Sand, pebbles, suspended solids, and corrosion products in water can damage the metal pipe and heat exchanger on the
HBC controller and may cause corrosion. When installing, prevent debris from entering the water. If there is debris in the water, perform debris removal operation after test run by cleaning the strainers inside the HBC controller. (Refer to other sections
for how to perform a test run.)
(3) Connecting pipes made of different materials
Connecting pipes used for HBC controller and indoor unit are copper alloy pipes. If steel pipes are connected tothe pipes, the
contact surface will corrode. Do not use steel pipes to avoid corrosion.
(4) Residual air
Residual air in the pipe results in water pump malfunction, noise, or water pipe corrosion in the water circuit. Ensure air is
purged before use. (Refer to other sections for how to perform air vent operation.)
pH (25°C[77°F])
Electric conductivity
Chloride ion
Sulfate ion
Acid consumption (pH4.8)
Total hardness
Calcium hardness
Ionic silica
Iron
Copper
Sulfide ion
Ammonium ion
Residual chlorine
Free carbon dioxide
Ryzner stability index
Standard items
Reference items
Items
Lower mid-range
temperature water system
7.0 ~ 8.0
30 or less
[300 or less]
50 or less
50 or less
50 or less
70 or less
50 or less
30 or less
1.0 or less
1.0 or less
not to be
detected
0.3 or less
0.25 or less
0.4 or less
–
7.0 ~ 8.0
30 or less
[300 or less]
50 or less
50 or less
50 or less
70 or less
50 or less
30 or less
0.3 or less
0.1 or less
not to be
detected
0.1 or less
0.3 or less
4.0 or less
–
Tendency
Recirculating
water
[68<T<140°F]
[20<T<60°C]
Make-up
water
Corrosive
Scale-
forming
Reference : Guideline of Water Quality for Refrigeration and Air Conditioning
Equipment. (JRA GL02E-1994)
(mg Cl
-
/)
(mg SO
4
2-
/)
(mg CaCO3/)
(mg CaCO3/)
(mg CaCO3/)
(mg SiO2/)
(mg Fe/ )
(mg Cu/ )
(mg S
2-
/)
(mg NH
4
+
/)
(mg Cl/ )
(mg CO2/ )
(mS/m) (25°C[77°F])
(μS/cm) (25°C[77°F])
[ I Read Before Servicing ]
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HWE1410A GB
3. Correction by antifreeze-liquid concentration
In HYBRID CITY MULTI system, antifreeze-liquid should be used to prevent the system from freezing. Refer to the following graphs
for the capacity correction by antifreeze-liquid. Refer to (1) for antifreeze-liquid concentration, (2) and (3) for capacity correction by
antifreeze-liquid concentration.
When adding antifreeze-liquid, be sure to perform the process in accordance with the relevant local laws and regulations.
(1) Antifreeze-liquid concentration
Use propylene glycol solution for antifreeze.
Refer to the following graph to estimate the antifreeze-liquid concentration required for freeze protection.
(2) Capacity correction by antifreeze-liquid concentration (cooling)
(3) Capacity correction by antifreeze-liquid concentration (heating)
010203040506070
Freezing Temperature [
°C
]
0
-5
-10
-15
-20
-25
-30
Antifreeze-liquid concentration [wt%]
01020304050
Ratio of cooling capacit y
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
Antifreeze-liquid concentration [wt%]
PURY-(E)P200~500YLM-A1,PQRY-P200~500YLM-A
01020304050
Ratio of cooling input
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
Antifreeze-liquid concentration [wt%]
01020304050
Ratio of heating capacity
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
Antifreeze-liquid concentration [wt%]
PURY-(E)P200~500YLM-A1,PQRY-P200~500YLM-A
01020304050
Ratio of heating input
1.2
1.18
1.16
1.14
1.12
1.1
1.08
1.06
1.04
1.02
1
Antifreeze-liquid concentration [wt%]
[ I Read Before Servicing ]
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HWE1410A GB
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HWE1410A GB
II Restrictions
[1] System configuration ....................................................................................................... 21
[2] Switch Settings and Address Settings ............................................................................. 22
[3] An Example of a System to which an MA Remote Controller is connected..................... 24
[4] An Example of a System to which an ME Remote Controller is connected..................... 30
[5] An Example of a System to which both MA Remote Controller and
ME Remote Controller are connected.............................................................................. 32
[6] Restrictions on Pipe Length ............................................................................................. 35
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HWE1410A GB
[ II Restrictions ]
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HWE1410A GB
II Restrictions
[1] System configuration
1. Table of compatible indoor units
The table below summarizes the types of indoor units that are compatible with different types of outdoor units.
(1) Standard combinations
1) "Maximum total capacity of connectable indoor units" refers to the sum of the numeric values in the indoor unit model names.
2) If the total capacity of the indoor units that are connected to a given outdoor unit exceeds the capacity of the outdoor unit, the
indoor units will not be able to perform at the rated capacity when they are operated simultaneously. Select a combination of
units so that the total capacity of the connected indoor units is at or below the capacity of the outdoor unit whenever possible.
Outdoor units
(Heat source units)
HBC controller
Sub-HBC
Maximum total capacity
of connectable indoor
units
Maximum number
of connectable in-
door units
Types of connectable
indoor units
(E)P200 CMB-WP108V-GA1,
CMB-WP1016V-GA1
CMB-WP108V-GB1,
CMB-WP1016V-GB1
100 - 300 50 WP15- WP50 models
Indoor units for use with
HBC controller
(E)P250 125 - 375 50
(E)P300 150 - 450 50
(E)P350 175 - 525 50
(E)P400 200 - 600 50
(E)P450 225 - 675 50
(E)P500 250 - 750 50
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