Service Handbook

AIR CONDITIONERS
MODEL
CMB-PW202V-J
Service Handbook
Safety Precautions
ŒBefore installing the unit, thoroughly read the following safety precautions.
ŒObserve 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.
ŒAfter reading this manual, give it to the user to retain for future reference.
ŒKeep 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
Ask your dealer or a qualified technician to install the
unit.
In the event of a refrigerant leak, thoroughly ventilate
the room.
Improper installation by the user may result in water leakage, electric shock, smoke, and/or fire.
If refrigerant gas leaks and comes in contact with an open
flame, poisonous gases will be produced.
Properly install the unit on a surface that can withstand the weight of the unit.
When installing the All-Fresh type units, take it into
consideration that the outside air may be discharged
directly into the room when the thermo is turned off.
Unit installed on an unstable surface may fall and cause injury.
Direct exposure to outdoor air may have an adverse effect
on health. It may also result in food spoilage.
Only use specified cables. Securely connect each cable so that the terminals do not carry the weight of the
cable.
Properly install the unit according to the instructions
in the installation manual.
Improperly connected or fixed cables may produce heat
and start a fire.
Improper installation may result in water leakage, electric
shock, smoke, and/or fire.
Take appropriate safety measures against strong
winds and earthquakes to prevent the unit from falling.
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.
If the unit is not installed properly, the unit may fall and
cause serious injury to the person or damage to the unit.
Insufficient capacity of the power supply circuit or improper
installation may result in malfunctions of the unit, electric
shock, smoke, and/or fire.
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.
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WARNING
Securely attach the terminal block cover (panel) to the
unit.
After completing the service work, check for a gas
leak.
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.
If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, poisonous gases may be
produced.
Only use the type of refrigerant that is indicated on the
unit when installing or reinstalling the unit.
Do not try to defeat the safety features of 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.
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.
When installing the unit in a small room, exercise caution and take measures against leaked refrigerant
reaching the limiting concentration.
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.
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.
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.)
Consult your dealer or a specialist when moving or reinstalling the unit.
Improper installation may result in water leakage, electric
shock, and/or fire.
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Precautions for handling units for use with R410A
CAUTION
Do not use the existing refrigerant piping.
Use a vacuum pump with a reverse-flow check valve.
ŒA large amount of chlorine that is contained in the residual
refrigerant and refrigerator oil in the existing piping may
cause the refrigerator oil in the new unit to deteriorate.
ŒR410A is a high-pressure refrigerant and can cause the
existing pipes to burst.
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.).
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.
ŒIf 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.
ŒInfiltration of water may cause the refrigerating machine
oil to deteriorate.
ŒGas leak detectors for conventional refrigerants will not
detect an R410A leak because R410A is free of chlorine.
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.
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.
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.
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.
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.
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Only use refrigerant R410A.
The use of other types of refrigerant that contain chlorine
(i.e. R22) 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.
When installing the unit in a hospital, take appropriate
measures to reduce noise interference.
If gaseous refrigerant leaks and piles up around the unit, it
may be ignited.
High-frequency medical equipment may interfere with the
normal operation of the air conditioner or vice versa.
Do not use the unit to keep food items, animals, plants,
artifacts, or for other special purposes.
Do not install the unit on or over things that cannot get
wet.
The unit is not designed to preserve food products.
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.
Do not use the unit in an unusual environment.
ŒDo 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.
ŒThe presence of organic solvents or corrosive gas (i.e.
ammonia, sulfur compounds, and acid) may cause gas
leakage or water leakage.
Select the installation site carefully.
ŒInstall the unit in a place where the noise from the unit will
not be a problem. (Install indoor unit and WCB at least 5
m away from each other when installed in a space with low
background noise, e.g., hotel rooms.)
ŒInstall the unit in the ceiling of an area where people are
not always present, e.g., hallway, office kitchen, restrooms. (Do not install the unit in the middle of a room.)
Install the indoor unit on a level surface.
Improper installation may result in water leakage, electric
shock, smoke, fire, or malfunctions.
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Before installing the unit (moving and reinstalling the unit) and performing
electrical work
CAUTION
Properly ground the unit.
Periodically check the installation base for damage.
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.
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.
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.
Improper plumbing work may result in water leakage and
damage to the furnishings.
Install an earth leakage breaker to avoid the risk of
electric shock.
Exercise caution when transporting products.
ŒProducts weighing more than 20 kg should not be carried
alone.
ŒDo not carry the product by the PP bands that are used on
some products.
ŒDo not touch the heat exchanger fins. They are sharp and
dangerous.
ŒWhen lifting the unit with a crane, secure all four corners
to prevent the unit from falling.
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.
Properly dispose of the packing materials.
Use breakers and fuses (current breaker, remote
switch <switch + Type-B fuse>, moulded case circuit
breaker) with the proper current capacity.
ŒNails and wood pieces in the package may pose a risk of
injury.
ŒPlastic bags may pose a risk of choking hazard to children. Tear plastic bags into pieces before disposing of
them.
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.
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Before the test run
CAUTION
Turn on the unit at least 12 hours before the test run.
Do not operate the unit without panels and safety
guards.
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.
Rotating, high-temperature, or high-voltage parts on the unit
pose a risk of burns and/or electric shock.
To avoid the risk of electric shock or malfunction of the
unit, do not operate switches with wet hands.
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 touch the refrigerant pipes with bare hands during and immediately after operation.
Do not operate the unit without the air filter.
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.
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Dust particles may build up in the system and cause malfunctions.
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CONTENTS
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..................................................................................................................... 9
[8] Vacuum Drying (Evacuation) .................................................................................................. 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
II Restrictions
[1] System configuration .............................................................................................................. 17
[2] Switch Settings and Address Settings .................................................................................... 18
[3] An Example of a System to which an MA Remote Controller is connected ........................... 20
[4] Restrictions on Pipe Length.................................................................................................... 23
III WCB Components
[1] WCB Components .................................................................................................................. 29
[2] Control Box of the WCB.......................................................................................................... 30
[3] WCB Circuit Board.................................................................................................................. 31
IV Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the WCB .................................................................................... 35
V Refrigerant Circuit
[1] Refrigerant Circuit Diagram .................................................................................................... 39
[2] Principal Parts and Functions ................................................................................................. 40
VI Control
[1] Functions and Factory Settings of the Dipswitches ................................................................ 43
[2] Controlling WCB ..................................................................................................................... 44
[3] Operation Flow Chart.............................................................................................................. 46
VII Test Run Mode
[1] Items to be checked before a Test Run.................................................................................. 55
[2] Adjusting the Refrigerant Amount........................................................................................... 56
[3] The following symptoms are normal. ...................................................................................... 56
[4] Standard Operation Data (Reference Data) ........................................................................... 57
VIII Troubleshooting
[1] Error Code Lists...................................................................................................................... 65
[2] Responding to Error Display on the Remote Controller.......................................................... 66
[3] Troubleshooting Principal Parts.............................................................................................. 87
[4] Servicing the WCB.................................................................................................................. 97
IX LED Monitor Display on the Outdoor Unit Board
[1] How to Read the LED on the Service Monitor ...................................................................... 101
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I Read Before Servicing
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
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Read Before Servicing ....................................................................................................... 3
Necessary Tools and Materials.......................................................................................... 4
Piping Materials ................................................................................................................. 5
Storage of Piping ............................................................................................................... 7
Pipe Processing ................................................................................................................. 7
Brazing............................................................................................................................... 8
Air Tightness Test .............................................................................................................. 9
Vacuum Drying (Evacuation) ........................................................................................... 10
Refrigerant Charging........................................................................................................ 12
Remedies to be taken in case of a Refrigerant Leak ....................................................... 12
Characteristics of the Conventional and the New Refrigerants ....................................... 13
Notes on Refrigerating Machine Oil ................................................................................. 14
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[ I Read Before Servicing ]
[1] Read Before Servicing
I 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/WR2 YHM-A series R410A
2. Check the symptoms exhibited by the unit to be serviced.
Refer to this service handbook for symptoms relating to the refrigerant cycle.
3. Thoroughly read the safety precautions at the beginning of this manual.
4. Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant.
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.
ŒUse 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.
ŒThese 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
ŒInstall new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
ŒThe use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.
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[ I Read Before Servicing ]
[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)
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
Use Type-2 Flare nuts.
Connection of the unit with the pipes
2. Tools and materials that may be used with R410A with some restrictions
Tools/Materials
Use
Notes
Gas Leak Detector
Gas leak detection
The ones for use with HFC refrigerant
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.
3. Tools and materials that are used with R22 or R407C that may also be used with R410A
Tools/Materials
Use
Vacuum Pump with a Check Valve
Vacuum drying
Bender
Bending pipes
Torque Wrench
Tightening flare nuts
Pipe Cutter
Cutting pipes
Welder and Nitrogen Cylinder
Welding pipes
Refrigerant Charging Meter
Refrigerant charging
Vacuum Gauge
Vacuum level check
Notes
Only the flare processing dimensions
for pipes that have a diameter of
ø12.70 (1/2") and ø15.88 (5/8") have
been changed.
4. Tools and materials that must not be used with R410A
Tools/Materials
Charging Cylinder
Use
Refrigerant charging
Notes
Prohibited to use
Tools for R410A must be handled with special care to keep moisture and dust from infiltrating the cycle.
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[ I Read Before Servicing ]
[3] Piping Materials
Do not use the existing piping!
1. Copper pipe materials
O-material (Annealed)
Soft copper pipes (annealed copper pipes). They can easily be bent with hands.
1/2H-material (Drawn)
Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed)
at the same radial thickness.
ŒThe distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes themselves.
2. Types of copper pipes
Maximum working pressure
Refrigerant type
3.45 MPa [500psi]
R22, R407C etc.
4.30 MPa [624psi]
R410A etc.
3. Piping materials/Radial thickness
Use refrigerant pipes made of phosphorus deoxidized copper.
The operation pressure of the units that use R410A is higher than that of the units that use R22.
Use pipes that have at least the radial thickness specified in the chart below.
(Pipes with a radial thickness of 0.7 mm or less may not be used.)
Pipe size (mm[in])
Radial thickness (mm)
ø6.35
[1/4"]
0.8t
ø9.52
[3/8"]
0.8t
ø12.7
[1/2"]
0.8t
ø15.88
[5/8"]
1.0t
ø19.05
[3/4"]
1.0t
ø22.2
[7/8"]
1.0t
ø25.4
[1"]
1.0t
ø28.58
[1-1/8"]
1.0t
ø31.75
[1-1/4"]
1.1t
ø34.93
[1-3/8"]
1.1t
ø41.28
[1-5/8"]
1.2t
Type
O-material (Annealed)
1/2H-material,
H-material (Drawn)
ŒThe pipes in the system that uses the refrigerant currently on the market are made with O-material (Annealed), even if the
pipe diameter is less than ø19.05 (3/4"). For a system that uses R410A, use pipes that are made with 1/2H-material (Drawn)
unless the pipe diameter is at least ø19.05 (3/4") and the radial thickness is at least 1.2t.
ŒThe figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.
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[ I Read Before Servicing ]
4. Thickness and refrigerant type indicated on the piping materials
Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant.
5. Flare processing (O-material (Annealed) and OL-material only)
The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system.
Flare processing dimensions (mm[in])
A dimension (mm)
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
Dimension A
Pipe size (mm[in])
(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.
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 B
The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.
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[ I Read Before Servicing ]
[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.
ŒUse a minimum amount of oil.
ŒUse only ester oil, ether oil, and alkylbenzene.
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[ I Read Before Servicing ]
[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
Use of oxidized solder for brazing
Use of non-oxidized solder for brazing
1. Items to be strictly observed
ŒDo not conduct refrigerant piping work outdoors if raining.
ŒUse non-oxidized solder.
ŒUse a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and
copper coupling.
ŒIf installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
ŒThe 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.
ŒFlux generally contains chloride. Residual flux in the refrigerant circuit will cause sludge to form.
3. Notes
Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.
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[ I Read Before Servicing ]
[7] Air Tightness Test
No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak.
Halide torch
R22 leakage detector
1. Items to be strictly observed
ŒPressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tightness, taking temperature variations into account.
ŒRefrigerant R410A must be charged in its liquid state (vs. gaseous state).
2. Reasons
ŒOxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
ŒRefrigerant R410A must be charged in its liquid state. If gaseous refrigerant in the cylinder is drawn out first, the composition
of the remaining refrigerant in the cylinder will change and become unsuitable for use.
3. Notes
Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an
HFC(R410A) leak.
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[ I Read Before Servicing ]
[8] Vacuum Drying (Evacuation)
(Photo1) 15010H
(Photo2) 14010
Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge
1. Vacuum pump with a reverse-flow check valve (Photo1)
To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum
pump with a reverse-flow check valve.
A reverse-flow check valve may also be added to the vacuum pump currently in use.
2. Standard of vacuum degree (Photo 2)
Use a vacuum pump that attains 0.5Torr(65Pa) or lower degree of vacuum after 5 minutes of operation, and connect it directly
to the vacuum gauge. Use a pump well-maintained with an appropriate lubricant. A poorly maintained vacuum pump may not
be able to attain the desired degree of vacuum.
3. Required precision of vacuum gauge
Use a vacuum gauge that registers a vacuum degree of 5Torr(650Pa) and measures at intervals of 1Torr(130Pa). (A recommended vacuum gauge is shown in Photo2.)
Do not use a commonly used gauge manifold because it cannot register a vacuum degree of 5Torr(650Pa).
4. Evacuation time
ŒAfter the degree of vacuum has reached 5Torr(650Pa), evacuate for an additional 1 hour. (A thorough vacuum drying removes moisture in the pipes.)
ŒVerify that the vacuum degree has not risen by more than 1Torr(130Pa) 1hour after evacuation. A rise by less than
1Torr(130Pa) is acceptable.
ŒIf 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
ŒWhen 5Torr(650Pa) or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has penetrated the system or that there is a leak.
ŒIf water infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to
0.5kgf/cm2G(0.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree of vacuum below 5Torr(650Pa) is attained or until the pressure stops rising.
ŒOnly use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)
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[ I Read Before Servicing ]
7. Notes
ŒTo 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).
ŒTo evacuate air only from the outdoor units
Apply a vacuum through the check joints on the high and low pressure sides (CJ1, and 2).
ŒTo evacuate air from the indoor units and extension pipes
Apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1
and 2).
HWE09070
- 11 -
GB
[ I Read Before Servicing ]
[9] Refrigerant Charging
Cylinder without a siphon
Cylinder with a siphon
Cylinder
Cylinder
Cylinder color R410A is pink.
Refrigerant charging in the liquid state
Valve
Valve
liquid
liquid
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 section "[5] Refrigerant Leak" in Chapter IX in the R2 service handbook.
HWE09070
- 12 -
GB
[ I Read Before Servicing ]
[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.
New Refrigerant (HFC type)
Conventional Refrigerant (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
Not included
Not included
Included
A1/A1
A1/A1
A1
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
64.0
42.5
44.4
Nonflammable
Nonflammable
Nonflammable
0
0
0.055
1730
1530
1700
Refrigerant charging in
the liquid state
Refrigerant charging in
the liquid state
Refrigerant charging in
the gaseous state
Available
Available
Available
Chloride
Safety Class
Molecular Weight
Saturated Steam Density
(25°C,kg/m3/77°F,psi)
Flammability
Ozone Depletion Coefficient
(ODP)*1
Global Warming Coefficient (GWP)*2
Refrigerant Charging Method
Replenishment of Refrigerant after a Refrigerant
Leak
*1 When CFC11 is used as a reference
*2 When CO2 is used as a reference
2. Refrigerant composition
R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To
be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn
out, the composition of the remaining refrigerant will change and become unsuitable for use.
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced.
3. Pressure characteristics
The pressure in the system using R410A is 1.6 times as great as that in the system using R22.
Pressure (gauge)
Temperature (°C/°F)
HWE09070
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
- 13 -
GB
[ I Read Before Servicing ]
[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.
Refrigerant
Refrigerating machine oil
R22
Mineral oil
R407C
Ester oil
R410A
Ester oil
2. Effects of contaminants*1
Refrigerating machine oil used in the HFC system must be handled with special care to keep contaminants out.
The table below shows the effect of contaminants in the refrigerating machine oil on the refrigeration cycle.
3. The effects of contaminants in the refrigerating machine oil on the refrigeration cycle.
Cause
Symptoms
Water infiltration
Frozen expansion valve
and capillary tubes
Hydrolysis
Air infiltration
Effects on the refrigerant cycle
Oxidization
Sludge formation and adhesion
Acid generation
Oxidization
Oil degradation
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
Sludge formation and adhesion
Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Oil degradation
Burn-in on the orbiting scroll
Dust, dirt
Infiltration of
contaminants
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
Mineral oil
etc.
*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.
HWE09070
- 14 -
GB
II Restrictions
[1]
[2]
[3]
[4]
HWE09070
System configuration ....................................................................................................... 17
Switch Settings and Address Settings ............................................................................. 18
An Example of a System to which an MA Remote Controller is connected..................... 20
Restrictions on Pipe Length ............................................................................................. 23
- 15 -
GB
- 16 -
[ II Restrictions ]
[1] System configuration
II Restrictions
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
Outdoor
units
Composing units
Maximum total capacity
of connectable indoor
units
Maximum number
of connectable indoor units
P200
-
-
100 - 260
17
P250
-
-
125 - 325
21
P300
-
-
150 - 390
26
P350
-
-
175 - 455
30
Types of connectable indoor units
P15 - P250 models
R410A series indoor units
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.
(2) High COP combinations
Outdoor
units
Composing units
Maximum total capacity
of connectable indoor
units
Maximum number
of connectable indoor units
EP200
-
-
100 - 260
17
EP250
-
-
125 - 325
21
EP300
-
-
150 - 390
26
Types of connectable indoor units
P15 - P250 models
R410A series indoor units
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.
HWE09070
- 17 -
GB
[ II Restrictions ]
[2] Switch Settings and Address Settings
1. Switch setting
The need for switch settings depends on the system configuration. Read section "[3] An Example of a System to which an MA
Remote Controller is connected" before performing wiring work.
Set the switches while the power is turned off.
If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not
function properly.
Units on which to set the switches
Symbol
Units to which the power must be shut off
IC
Outdoor units *3 and Indoor units
LOSSNAY, OA processing unit *1
LC
Outdoor units *3 and LOSSNAY
ME remote controller
Main/sub remote
controller
RC
Outdoor units *3
MA remote controller
Main/sub remote
controller
MA
Indoor units
CITY MULTI outdoor unit*2
OC,OS
Outdoor units *3
WCB
BC*4
Outdoor units *3 and WCB
CITY MULTI indoor unit
Main/sub unit
*1. Applicable when LOSSNAY units are connected to the indoor-outdoor transmission line.
*2. The outdoor units in the same refrigerant circuit are automatically designated as OC and OS in the order of capacity
from large to small (if two or more units have the same capacity, in the order of address from small to large).
*3. Turn off the power to all the outdoor units in the same refrigerant circuit.
*4. The symbol of WCB is the same as that of BC controller.
2. M-NET Address settings
WCB address setting is the same way as the main BC controller.
HWE09070
- 18 -
GB
[ II Restrictions ]
HWE09070
- 19 -
GB
[ II Restrictions ]
[3] An Example of a System to which an MA Remote Controller is connected
1. System with one outdoor unit (automatic address setup for both indoor and outdoor units)
(1) Sample control wiring
L1
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
Group
OC
BC
00
00
TB7
M1 M2 S
Interlock operation with
the ventilation unit
Group
IC
IC
LC
00
00
00
TB5
M1 M2 S
TB02
M1 M2 S
L4
TB15
1 2
TB5
M1 M2 S
TB5
M1 M2 S
TB15
1 2
m1
TB3
M1 M2
L3
L2
A1 B2
A1 B2
MA
RC
MA
L11
A1 B2
L12
Group
L13
Group
IC
IC
IC
00
00
00
TB15
1 2
TB5
M1 M2 S
TB15
1 2
TB5
M1 M2 S
TB15
1 2
m5
m4
m2
TB5
M1 M2 S
A1 B2
A1 B2
A1 B2
A1 B2
MA
MA
MA
MA
(2) Cautions
1) ME remote controller and MA remote controller cannot
both be connected to the same group of indoor units.
2) No more than 2 MA remote controllers can be connected
to a group of indoor units.
3) When the number of the connected indoor units is as
shown in the table below, one or more transmission
boosters (sold separately) are required.
To connect two transmission boosters, connect them in
parallel. (Observe the maximum number of connectable
indoor units that are listed in the specifications for each
outdoor unit.)
4) Automatic address setup is not available if start-stop input(CN32, CN51, CN41) is used for a group operation of
indoor units. Refer to section "[5] 2. Manual address setup for both indoor and outdoor units" in the R2 service
handbook.
5) To connect two or more LOSSNAY units to a system, refer to the next section "[5] 2. An example of a system with
one outdoor unit to which 2 or more LOSSNAY units are
connected" in the R2 service handbook.
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Maximum distance (1.25mm2 [AWG16] or larger)
L1 +L2+L3+L4 200m [656ft]
L1 +L2+L3+L11+L12+L13 200m [656ft]
2) Transmission line for centralized control
No connection is required.
3) MA remote controller wiring
Maximum overall line length
(0.3 to 1.25mm2 [AWG22 to 16])
m1 200m [656ft]
m2+m3 200m [656ft]
m4+m5 200m [656ft]
Number of transmission
booster (sold separately) required
1 unit
When the P200 and P250 models are not included in the connected indoor units
27 - 50 units
When the P200 and P250 models are included in the connected indoor units
21 - 39 units
HWE09070
m3
2 units
-
40 - 50 units
- 20 -
GB
[ II Restrictions ]
ŒSet one of the MA remote controllers as a sub controller.
(Refer to the Instruction Manual for the MA remote controller for the setting method.)
Group operation of indoor units
To perform a group operation of indoor units (IC), daisychain terminals 1 and 2 on the terminal block (TB15) on
all indoor units (IC) in the same group, and then connect
terminals 1 and 2 on the terminal block (TB15) on the indoor unit on one end to the terminal block on the MA remotecontroller. (Non-polarized two-wire)
ŒWhen performing a group operation of indoor units that
have different functions, "Automatic indoor/outdoor addresssetup" is not available.
4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal
block(TB5) on the indoor unit (IC) to the appropriate terminals on the terminal block (TB5) on LOSSNAY (LC).
(Non-polarized two-wire)
ŒInterlock operation setting with all the indoor units in the
same system will automatically be made. (It is required
that the Lossnay unit be turned on before the outdoorunit.)
ŒWhen performing an interlocked operation of part of the
indoor units in the system with a LOSSNAY unit, using a
LOSSNAY unit alone without interlocking it with any
units, performing an interlock operation of more than 16
indoor units with a LOSSNAY unit, or connecting two or
more LOSSNAY units to the same refrigerant system,
the automatic IC/OC address setup function is not available.
5) Switch setting
No address settings required.
(4) Wiring method
1) Indoor/outdoor transmission line
Daisy-chain terminals M1 and M2 of the terminal block
for indoor-outdoor transmission line (TB3) on the outdoor
units (OC), of the terminal block for indoor-outdoor transmission line (TB02) on the WCB (BC), and of the terminal
block for indoor-outdoor transmission line (TB5) on each
indoor unit (IC). (Non-polarized two-wire)
ŒOnly use shielded cables.
Shielded cable connection
Daisy-chain the ground terminal ( ) on the outdoorunits (OC), the S terminal of the terminal block(TB02) on
the BC controller (BC), and the S terminal of the terminal
block (TB5) on the indoor unit (IC) with the shielded cable.
2) Transmission line for centralized control
No connection is required.
3) MA remote controller wiring
Connect terminals 1 and 2 on the terminal block for MA
remote controller line (TB15) on the indoor unit (IC) to the
terminal block on the MA remote controller (MA).
(Non-polarized two-wire)
When 2 remote controllers are connected to the system
When 2 remote controllers are connected to the system,
connect terminals 1 and 2 of the terminal block (TB15) on
the indoor unit (IC) to the terminal block on the two MA
remote controllers.
(5) Address setting method
Procedures
1
Address setting range
Unit or controller
Indoor unit
Main unit
IC
Sub unit
IC
Setting method
Notes
No settings
required.
-
Port number setting is required (Note)
To perform a group operation of indoor units that feature different functions, the
automatic IC/OC address
setup function is not available.
Factory
setting
00
2
LOSSNAY
LC
No settings
required.
-
00
3
MA
Main
remote con- remote controller
troller
MA
No settings
required.
-
Main
Sub
remote controller
MA
Sub
remote controller
OC
No settings
required.
-
00
BC
No settings
required.
-
00
4
Outdoor unit
5
Auxiliary
outdoor unit
WCB
Settings to be
made with the
Sub/Main
switch
The port number setting is required to connect to the indoor units as shown below.
ŒPort for Indoor unit/PWFY: Port number "0"
ŒPort for PWFY: Port number "1"
HWE09070
- 21 -
GB
[ II Restrictions ]
HWE09070
- 22 -
GB
[ II Restrictions ]
[4] Restrictions on Pipe Length
Outdoor unit
L1
A
WCB
H
H’
h1
Indoor/PWFY
branch
C
D
Line branch
(Header branch
possible)
L2
capped
E
a
d
(Line branch possible)
Header branch
B
PWFY branch
e
f
g
PWFY
b
PWFY
c
PWFY
h2
Indoor
Indoor
Indoor
PWFY
Unit: m [ft]
Operation
Length
Pipe sections
Total pipe length
Allowable length of pipes
A+B+C+D+E+a+b+c+d Refer to the restrictions on the total piping
+e+f+g
length in the graph on the next page.
Total pipe length from the outdoor unit
to the farthest indoor unit
A+C+D+E+g / A+B+c
165 [541] or less
(Equivalent length 190 [623] or less)
A
110 [360] or less
C+D+E+g / B+c
40 [131] or less*1
Outdoor unit
above indoor unit
H
50 [164] or less
Outdoor unit below indoor unit
H'
40 [131] or less
Between indoor unit and WCB
h1
15 [49] (10[32]) or less*2
Between indoor units
h2
15 [49] (10[32]) or less *2
Between outdoor unit and WCB
Between WCB and indoor unit
Height
difference Between indoor
and outdoor units
*1. When the overall pipe length between the WCB and the farthest indoor unit exceeds 40m [131ft], observe the restrictions in the figure titled "Restrictions on pipe length" below. (Except the P250 models)
*2. When the capacity of the connected indoor units is P200 or above, use the figures in the parentheses as a reference.
1)
2)
3)
4)
All the indoor units that are connected to the same ports can only be operated in the same operation mode (cooling/heating).
Joint branching is not possible after header branching.
Cover the unused branch using the optional cover cap (CMY-S202-J).
Top-bottom differential 90m [295ft] (OU above IU) or 60m [196ft] (OU below IU) is not available.
HWE09070
- 23 -
GB
[ II Restrictions ]
1000
[3280]
900
[2952]
800
[2624]
700
[2296]
600
[1968]
500
[1640]
400
[1312]
300
[984]
200
[656] 10 20 30 40 50 60 70 80 90 100 110
[32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360]
Pipe length between outdoor unit and WCB (m[ft])
The height difference and the pipe length between WCB and indoor units
70
[229]
60
[196]
Pipe length between WCB
and farthest indoor unit (m[ft])
Aggregate length of all pipes(m[ft])
Restrictions on pipe length [PURY-(E)P200, P250,P300YHM-A
PQRY-P200,P250,P300YHM-A]
50
[164]
40
[131]
30
[98]
20
[64]
10
[32]
0
0
5
10
15
[16]
[32]
[49]
Height difference between WCB and farthest indoor unit (m[ft])
Aggregate length of all pipes(m[ft])
Restrictions on pipe length [PURY-EP250,EP300,P350YHM-A]
1000
[3280]
900
[2952]
800
[2624]
700
[2296]
600
[1968]
500
[1640]
400
[1312]
300
[984]
200
[656] 10 20
[32] [64]
30 40 50 60 70 80 90 100 110
[98] [131] [164] [196] [229] [262] [295] [328] [360]
Pipe length between outdoor unit and WCB (m[ft])
HWE09070
- 24 -
GB
[ II Restrictions ]
1. Refrigerant pipe size
(1) Pipe size between outdoor unit and WCB (Part A)
Unit : mm [inch]
Outdoor units
Refrigerant pipe size
Low-pressure pipe
High-pressure pipe
Low-pressure pipe
High-pressure pipe
ø19.05 [3/4"]
ø15.88 [5/8"]
ø19.05 [3/4"]
ø15.88 [5/8"]
200
250
ø22.2 [7/8"]
300
350
Connection to outdoor unit and WCB
ø19.05 [3/4"]
ø28.58 [1-1/8"]
ø22.20 [7/8"]
ø19.05 [3/4"]
ø28.58 [1-1/8"]
(2) Pipe size between branching points that connect to indoor units (Part B, C, D, and E)
Unit : mm [inch]
Indoor unit
Refrigerant pipe size (Brazed connection on all models)
Liquid pipe
Gas pipe
- P140
ø15.88 [5/8"]
P141 - P200
ø9.52 [3/8"]
ø19.05 [3/4"]
P201 - P300
ø22.2 [7/8"]
P301 - P400
ø12.7 [1/2"]
P401 -
ø15.88 [5/8"]
ø28.58
[1-1/8"]
(3) Pipe size between branching point and indoor unit (Part a, b, c, d, e, f, and g)
Unit : mm [inch]
Refrigerant pipe size
Indoor unit
P15, P20, P25, P32, P40, P50
P63, P71, P80
P100, P125, P140
P200
P250
HWE09070
Indoor unit connection
(Flare connection for all models)
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
ø6.35 [1/4"]
ø12.7 [1/2"]
ø6.35 [1/4"]
ø12.7 [1/2"]
ø9.52 [3/8"]
ø15.88 [5/8"]
ø9.52 [3/8"]
ø15.88 [5/8"]
ø9.52 [3/8"]
ø19.05 [3/4"]
ø22.20 [7/8"]
- 25 -
ø9.52 [3/8"]
ø19.05 [3/4"]
ø22.20 [7/8"]
GB
[ II Restrictions ]
2. Connecting the WCB
(1) Size of the pipe that fits the standard WCB ports
(E)P200 - P350 models
Connection: Brazed connection
To outdoor unit
WCB
Connection: Brazed connection
Connection: Brazed connection
PWFY
Indoor
Indoor
Indoor
PWFY
PWFY
PWFY
When connecting multiple indoor units to a single port, select the proper size pipes based on the total capacity of the downstream indoor units, using the table below as a reference.
Unit : mm [inch]
Operation
Outdoor unit side
Indoor unit side
Pipe sections
High-pressure side (liquid)
Low-pressure side (gas)
PURY-(E)P200YHM-A
PQRY-P200YHM-A
ø15.88 [5/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
PURY-(E)P250YHM-A
PURY-(E)P300YHM-A
PQRY-P250YHM-A
PQRY-P300YHM-A
ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
PURY-P350YHM-A
ø28.58[1-1/8"]
(Brazed connection)
- P140
ø15.88 [5/8"]
(Brazed connection)
P141 - P200
ø9.52 [3/8"]
(Brazed connection)
P201 - P300
ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
P301 - P400
ø12.7 [1/2"]
(Brazed connection)
P401 -
ø15.88 [5/8"]
(Brazed connection)
ø28.58 [1-1/8"]
(Brazed connection)
* WCB can only be connected to (E)P200 - P350 models of outdoor units.
HWE09070
- 26 -
GB
III WCB Components
[1] WCB Components ........................................................................................................... 29
[2] Control Box of the WCB................................................................................................... 30
[3] WCB Circuit Board........................................................................................................... 31
HWE09070
- 27 -
GB
- 28 -
[ III WCB Components ]
[1] WCB Components
III WCB Components
(1) Front
Liquid pipe (Indoor unit side or PWFY side)
Liquid pipe (PWFY side)
Gas pipe (Indoor unit side or PWFY side)
Gas pipe (PWFY side)
(2) Rear view
Tube in tube heat exchanger
TH14
TH16
TH12
Gas/Liquid separator
21S4a
LEV3
TH11
HWE09070
TH13
LEV1 SVM1
- 29 -
TH15
GB
[ III WCB Components ]
[2] Control Box of the WCB
Transformer
Terminal block for
power supply
Terminal block for
transmission line
WCB board
HWE09070
- 30 -
GB
[ III WCB Components ]
[3] WCB Circuit Board
SW4
HWE09070
SW5
SW6
SW2
- 31 -
SW1
GB
[ III WCB Components ]
HWE09070
- 32 -
GB
IV Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the WCB ............................................................................. 35
HWE09070
- 33 -
GB
- 34 -
HWE09070
- 35 -
LEV1
M
1
2
3 CN05
4
5 Red
6
1
2
3 CN07
4
5 Yellow
6
M
t˚
t˚
1
2
3
4
CN10
5
6
7
8
ON
OFF
ON
OFF
1
1
1
SW6
SW5
SW4
8
8
8
CN12
DSA
1
U
ZNR01
Function setting
3
5
F01
AC250V
6.3A F
U
ZNR02
LD1:CPU in operation
WCB Board
Unit address setting
SW2 SW1
10's 1's
digit digit
2 1
CN02
ON
OFF
2 1
CN03
Yellow
1
2
3 CN11
4
t˚
t˚
t˚
t˚
LEV3
TH16
TH15
TH14
TH13
TH12
TH11
1
CN13
2
Red
3
TR
20V㨪22V 220V㨪240V
1
3
5
7
CN26
X01
X02
CNTR
Red
1
3
TB01
L
N
1
2
3
4
1
2
3
4
1
2
3
4
1 T1
2
3
4
FUSE
(16A)
BREAKER
(16A)
PULL BOX
POWER SUPPLY
˜220V-240V
50Hz/60Hz
21S4a
SVM1
Indoor/outdoor
Transmission line
TO NEXT
INDOOR UNIT
M2
M1
TB02
S(SHIELD)
Solenoid valve
4-way valve
Fuse AC250V 6.3A F
21S4a
F01
Note: 1. TB02 is transmission terminal block.
Never connect power line to it.
2. The initial set values of switch on
WCB Board are as follows.
SW1:0
SW2:0
Terminal block(for Transmission)
SVM1
Expansion valve
LEV1,3
Terminal block(for power source)
Thermister sensor
TH11-16
TB02
Transformer
TR
TB01
Name
Symbol
(Symbol explanation)
[ IV Electrical Wiring Diagram ]
IV Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the WCB
GB
[ IV Electrical Wiring Diagram ]
HWE09070
- 36 -
GB
V Refrigerant Circuit
[1] Refrigerant Circuit Diagram ............................................................................................. 39
[2] Principal Parts and Functions .......................................................................................... 40
HWE09070
- 37 -
GB
- 38 -
[ V Refrigerant Circuit ]
[1] Refrigerant Circuit Diagram
V Refrigerant Circuit
PWFY unit gas pipe
(Heating only)
Brazed
SVM1
ST1
R2 high pressure pipe
Brazed
TH11
Gas/Liquid separator
TH13
PWFY unit liquid pipe
(Heating only)
Brazed
LEV1
TH14
TH12
HIC Circuit
TH15
LEV3
Indoor or PWFY unit liquid pipe
(Cooling or Heating)
Brazed
ST2 TH16
21S4a
R2 low pressure pipe
Brazed
HWE09070
- 39 -
ST3
Indoor or PWFY unit gas pipe
(Cooling or Heating)
Brazed
GB
[ V Refrigerant Circuit ]
[2] Principal Parts and Functions
Part name
Thermistor
Symbols
(functions)
TH11
(Liquid inlet
temperature)
TH12
(Bypass
outlet temperature)
TH13
(LEV1 inlet
temperature)
Usage
1) Detects High-pressure
saturation temperature
2) LEV control (differential
temperature control)
LEV control (Superheat)
1) Detects intermediate
pressure saturation temperature
2) LEV control (liquid level
control, differential temperature control)
Specifications
R 0 = 15k
R 0/80 = 3460
R t = 15 exp 3460
1
273 t
Check method
1
273
0°C[32°F] : 15kohm
10°C[50°F] :9.7kohm
20°C[68°F] :6.4kohm
25°C[77°F] :5.3kohm
30°C[86°F] :4.3kohm
40°C[104°F] :3.1kohm
TH14
(HIC inlet
temperature)
LEV control (liquid level control, differential temperature
control)
TH15
(Bypass inlet temperature)
LEV control (Superheat)
TH16
(Liquid refrigerant
temperature)
LEV control (Subcool)
Solenoid
valve
SVM1
Opens during cooling and de- AC220-240V
frost modes
Open while being powered/
closed while not being powered
LEV
LEV1
LEV3
4-way
valve
HWE09070
Part
code
21S4a
1) Liquid level control
2) Differential temperature
control
Switches between heating
and cooling
- 40 -
Continuity
check with a
tester
DC12V
Opening of a valve driven by a
stepping motor
0-2000 pulses
Same as
indoor LEV
AC220-240V
De-energized: cooling cycle
Energized: heating cycle
Continuity
check with a
tester
GB
VI Control
[1] Functions and Factory Settings of the Dipswitches ......................................................... 43
[2] Controlling WCB .............................................................................................................. 44
[3] Operation Flow Chart....................................................................................................... 46
HWE09070
- 41 -
GB
- 42 -
[ VI Control ]
[1] Functions and Factory Settings of the Dipswitches
VI Control
1. Switch functions <WCB (Control board) >
Switch
Function
Function according to switch setting
OFF
ON
Switch setting timing
SW4
1-8
-
-
-
-
SW5
1-8
-
-
-
-
1-4
-
-
-
-
5
Energy save mode
Disabled
Enabled
Any time
6-7
-
-
-
-
8
Changing the pressure
equalization time *1
6 minutes
18 minutes
Any time
SW6
*1 Refer to VI [2] Controlling WCB for detail.
HWE09070
- 43 -
GB
[ VI Control ]
[2] Controlling WCB
1. Control of SVM1
SVM turns on or off depending on the operation mode.
Operation
mode
Cooling only
Cooling main
Heating only
Heating main
Defrost
Stopped
SVM1
ON
Differential temperature control*1
OFF
OFF
ON
OFF
*1. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between TH11 and
TH13) in the specified range on a minute basis.
2. Control of LEV
LEV opening (sj) is controlled as follows depending on the operation mode.
Operation mode
Cooling only
LEV1
2000
LEV3
Superheat
control*4
Cooling main
Liquid level
control*1
Differential
temperature
control*2
Heating only
Heating main
Defrost
Stopped
110
110*3
2000
1200
2000
60
Differential
temperature
control*5
Differential
temperature
control*5
*1. Liquid level control: The LEV maintains the liquid level as calculated from the HIC inlet subcool temperature (TH13 and
TH14) in the specified range on a minute basis.
*2. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between TH11 and
TH13) in the specified range on a minute basis.
*3. The pulse may rise above 110 due to pressure rise on the liquid side.
*4. Superheat control: The LEV maintains the superheat amount as calculated from the bypass inlet and outlet temperatures
(TH12 and TH15) in the specified range on a minute basis.
*5. Differential temperature control: The valve operates to maintain the temperature difference dTHM (between outdoor unit
condensation temperature and TH14) in the specified range on a minute basis.
HWE09070
- 44 -
GB
[ VI Control ]
3. 21S4a operation control
21S4a turns on or off according to the operation mode.
Operation
mode
Cooling only
Cooling main
Heating only
Heating main
Defrost
Stopped
21S4a
OFF
OFF
ON
OFF
The status before defrosting
maintained
OFF
Operation mode switching
(Cooling/Heating) at the
indoor unit connection port
Compressor in
operation
YES
NO
Compressor is stopped.
(A standby command
is sent to the indoor units
in the Thermo-ON mode.)
Duration in which
NO
the compressor is stopped
≥20 minutes
Pressure equalization
operation
YES
Duration in which
the compressor is stopped
≥20 minutes
NO
*Note 1
Pressure equalization
time ≥6 minutes
NO
YES
Completion of
pressure equalization
Switching 4-way valve
*Note 1. Pressure equalization time is created to lower the noise that is produced when 4-way valve is switched.
The pressure equalization time can be changed by DIP SW6-8. (OFF: 6 minutes, ON: 18 minutes)
*Note 2. Select the installation site carefully, considering the noise that is produced when the 4-way valve is switched.
Install the unit in a place where the noise from the unit will not be a problem.
(Install indoor unit and WCB at least 5 m [16-6/16 ft] away from each other when installing in a space with low
background noise, e.g., hotel rooms.)
Install the unit in the ceiling of an area that are not always occupied by people, e.g., hallway, office kitchen, restrooms.
(Do not install the unit in the middle of a room.)
HWE09070
- 45 -
GB
[ VI Control ]
[3] Operation Flow Chart
1. Mode determination flowchart
(1) Indoor unit (cooling, heating, dry, fan mode)
Start
Normal operation
Breaker
turned on
Error
Stop
NO
YES
1
Operation SW
turned on
NO
YES
*Note 1
1. Protection function
self-holding cancelled.
2. Indoor unit LEV fully closed.
Remote controller
display lit off
*Note 2
NO
Error mode
YES
YES
Operation mode
Auxiliary heater
ON
NO
1. Auxiliary heater OFF FAN stop
2. Low fan speed for
1 minute
YES
Drain pump
ON
3-minute drain
pump ON
NO
Error stop
Error display
Cooling mode
Heating mode
Dry mode
Automatic
cooling/heating mode
Fan mode
Self-holding of
protection function
Cooling display
Heating display
Dry display
Auto COOL/HEAT
display
Fan display
Error command
to outdoor unit
Indoor unit
LEV fully closed.
*Note 1
*Note 3
YES
*Note 3
YES
*Note 3
YES
*Note 3
YES
Prohibition
Prohibition
Prohibition
Prohibition
NO
NO
NO
NO
Refer to 2-(1) for
cooling operation.
Refer to 2-(2) for
heating operation.
Refer to 2-(3) for
dry operation.
Auto
cooling/heating mode
Fan operations
Prohibition
"Blinking display on
the remote controller"
1
1
*Note 1. Indoor unit LEV fully closed : Opening 41.
*Note 2. The system may go into the error mode on either the indoor unit side or the WCB or outdoor unit side.
If some of the indoor units are experiencing a problem, only those indoor units that are experiencing the problem
will stop. If the WCB or the outdoor unit is experiencing a problem, all the connected units will stop.
*Note 3. If multiple indoor units are connected to a port and there is a discrepancy in the operation mode between the
indoor unit and the port, the operation will be prohibited. (Operation mode blinks on the remote controller, the
Fan stops, indoor unit LEV becomes fully closed.)
HWE09070
- 46 -
GB
[ VI Control ]
(2) Outdoor unit (cooling only, heating only, cooling main and heating main modes)
Start
Normal operation
Breaker
turned on
Error
NO
Unit in the stopped state
YES
"HO" / "PLEASE WAIT" blinks
on the remote controller
*Note 1
NO
Indoor units
registered to the
remote controller
YES
2
NO
Operation
command
Protection function
self-holding cancelled.
YES
fan
Operation
mode
Cooling only, Heating only
Mixture of units in cooling and heating
*Note 2
1. 52C1 4-way valve OFF
2. Inverter output 0Hz
3. Fan stop
4. All solenoid valves OFF
YES
Error mode
NO
52C1 ON
Error stop
*Note 3
Mixture of units in cooling and heating
Operation
mode
Operation
mode
Cooling Only
Heating Only
Error display on
the outdoor unit LED
*Note 4
Cooling Main
Self-holding of
protection function
Heating Main
Operation command
to the WCB
Operation command to the WCB
2
*Note 1. For about three minutes after power on, a search for the outdoor unit address, WCB address, indoor unit
address, remote controller address, and group information will start. During the search,
"HO"/ "PLEASE WAIT" blinks on the display of the remote controller. When the indoor unit to be controlled
by the remote controller is missing, "HO"/ "PLEASE WAIT" keeps blinking on the display of the remote
controller, even after three or more minutes have passed after power on.
*Note 2. The system may go into the error mode on the indoor unit, WCB, or outdoor unit side. The outdoor units will stop
only when all of the connected indoor units are experiencing a problem. If at least one of the indoor units is in
normal operation, the outdoor unit will continue in operation, displaying an error code on the LED.
*Note 3. The units will follow the operation mode commands from WCB.
*Note 4. When the operation mode commands from WCB are mixed (both cooling and heating), the actual operation mode
(Cooling-main or Heating-main) is determined by the outdoor unit.
HWE09070
- 47 -
GB
[ VI Control ]
(3) WCB (cooling only, heating only, cooling main and heating main modes)
Start
Breaker
turned on
Normal operation
Error
NO
Unit in the stopped state
YES
3
NO
Operation
command
YES
Protection function
self-holding cancelled.
1. Determination of operation mode
(Cooling only, Heating only, Mixture
of units in cooling and heating)
2. Transmitted to the outdoor unit
Reception of operation mode
command from the outdoor unit
*Note 1
YES
Error mode
NO
Fan
Operation
mode
All units in the
same mode
Solenoid valves OFF
LEV Fully closed
Cooling Only
Mixture of units in cooling and heating
Operation
mode
Error stop
Operation
mode
Heating Only
Error command to
outdoor unit
Self-holding of
protection function
Cooling Main
Heating Main
Error command to
indoor unit
3
Note 1. The system may go into the error mode on the indoor unit, WCB, or outdoor unit side. If some of the
indoor units are experiencing a problem, only those indoor units that are experiencing the problem will stop.
If WCB or the outdoor unit is experiencing a problem, all the connected units will stop.
HWE09070
- 48 -
GB
[ VI Control ]
2. Operations in each mode
(1) Cooling operation
Cooling operation
Normal operation
During test run mode
4-way valve OFF
Indoor unit fan
operation
Test run mode
ON
Unit in the stopped state
*Note 1
YES
NO
NO
Thermostat
ON
YES
YES
3-minute restart
prevention
NO
1. Inverter output 0Hz
2. Indoor unit LEV open to the specified position
3. Solenoid valves OFF
4. Outdoor unit fan stop
5. WCB solenoid valves OFF
6. WCB LEV fully closed
7. WCB 4-way valve control
1. Inverter frequency control
2. Indoor unit LEV control
3. Solenoid valve control
4. Outdoor unit fan control
5. WCB solenoid valve control
6. WCB LEV control
7. WCB 4-way valve control
2
3
*Note 1. The indoor fan operates at the set notch under cooling mode regardless of the
ON/OFF state of the thermostat.
HWE09070
- 49 -
GB
[ VI Control ]
(2) Heating operation
Normal operation
Heating operation
Defrost operation
*Note 1,2
Unit in the stopped state
Defrost
operation
During test run mode
NO
4-way valve ON
Test run mode
ON
4-way valve OFF
YES
NO
NO
YES
Thermostat
ON
YES
1. Indoor unit fan stop
2. Inverter defrost frequency control
3. Indoor unit LEV fully open
4. Solenoid valve control
5. Outdoor unit fan stop
6. WCB solenoid valve control
7. WCB LEV control
8. WCB 4-way valve control
3-minute restart
prevention
*Note 1,2
NO
1. Indoor unit fan operation at
Very Low speed
2. Inverter output 0Hz
3. Indoor unit LEV open to the specified position
4. Solenoid valve OFF
5. Outdoor unit fan stop
6. WCB solenoid valve control
7. WCB LEV control
8. WCB 4-way valve control
1. Indoor/outdoor unit fan control
2. Inverter frequency control
3. Indoor unit LEV fully open
4. Solenoid valve control
5. WCB solenoid valve control, 4-way valve control
6. WCB LEV control
7. WCB 4-way valve control
1
Stopping the
defrost operation
NO
YES
Stopping the defrost operation
3
*Note 1. When the outdoor unit goes into the defrost mode, defrost command is sent to WCB and indoor units. Upon reception
of the command, the indoor units will go into the defrost mode. When defrosting is completed and upon receiving the
signal that indicates the completion of defrosting, indoor units will resume the heating operation.
*Note 2. Defrost end condition: 10 or more minutes must pass after defrost operation.
or Outdoor unit piping temperature : Refer to section "-7- Defrost Operation Control" in Chapter VII in R2 service
handbook.
HWE09070
- 50 -
GB
[ VI Control ]
(3) Dry operation
Dry operation
Normal operation
Thermostat ON
4-way valve OFF
Test run mode
ON
Unit in the stopped state
YES
*Note 2
NO
Thermostat ON
NO
Suction temperature
18 C[64 F]
YES
*Note 1
1. Indoor unit fan stop
2. Inverter output 0Hz
3. Indoor unit LEV fully closed.
4. Solenoid valve OFF
5. Outdoor unit fan stop
6. WCB Solenoid valve OFF
7. WCB LEV fully closed
8. WCB 4-way valve control
1. Outdoor unit (compressor)
intermittent operation
2. Indoor unit fan intermittent operations
(Synchronized with the compressor:
low speed, OFF operations)
2
3
*Note 1.When the indoor unit inlet temperature exceeds 18 C [64 F], the outdoor unit (compressor) and the
indoor unit fan start the intermittent operation simultaneously. The outdoor unit, WCB, the LEVs and
solenoid valves on the outdoor unit operate in the same way as they do in the cooling operation when
the compressor is turned on.
*Note 2.Thermostat is always kept on during test run mode, and indoor and outdoor unit intermittent operation
(ON) time is a little longer than that of normal operation.
HWE09070
- 51 -
GB
[ VI Control ]
HWE09070
- 52 -
GB
VII Test Run Mode
[1]
[2]
[3]
[4]
HWE09070
Items to be checked before a Test Run ........................................................................... 55
Adjusting the Refrigerant Amount .................................................................................... 56
The following symptoms are normal. ............................................................................... 56
Standard Operation Data (Reference Data) .................................................................... 57
- 53 -
GB
- 54 -
[ VII Test Run Mode ]
[1] Items to be checked before a Test Run
VII Test Run Mode
(1) Check for refrigerant leak and loose cables and connectors.
(2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and
make sure it reads at least 1.0Mohm.
ŒDo not operate the unit if the insulation resistance is below 1.0Mohm.
ŒDo not apply megger voltage to the terminal block for transmission line. Doing so will damage the controller board.
ŒThe insulation resistance between the power supply terminal block and the ground could go down to close to 1Mohm immediately after installation or when the power is kept off for an extended period of time because of the accumulation of refrigerant
in the compressor.
ŒIf insulation resistance reads at least 1Mohm, by turning on the main power and powering the crankcase heater for at least
12 hours, the refrigerant in the compressor will evaporate and the insulation resistance will go up.
ŒDo not measure the insulation resistance of the terminal block for transmission line for the unit remote controller.
(3) Check that the valve on the gas pipe and liquid pipe are fully open.
Securely tighten the cap.
(4) Check the phase sequence and the voltage of the power supply.
(5) [When a transmission booster is connected]
Turn on the transmission booster before turning on the outdoor units.
ŒIf the outdoor units are turned on first, the connection information for the refrigerant circuit may not be properly recognized.
ŒIn case the outdoor units are turned on before the transmission booster is turned on, perform a power reset on the outdoor
units after turning on the power booster.
(6) Turn on the main power to the unit at least 12 hours before test run to power the crankcase heater.
Insufficient powering time may result in compressor damage.
(7) When a power supply unit is connected to the transmission line for centralized control, perform a test run with the
power supply unit being energized. Leave the power jumper connector on CN41 as it is (factory setting).
HWE09070
- 55 -
GB
[ VII Test Run Mode ]
[2] Adjusting the Refrigerant Amount
Calculate the amount of refrigerant to be charged for WCB in the same way as that for BC controller.
[3] The following symptoms are normal.
Symptoms
Remote controller
display
The indoor unit does not start
after starting cooling (heating)
operation.
"Cooling (heating)"
icon blinks on the
display.
The auto vane adjusts its position by itself.
Normal display
Cause
The unit cannot perform a heating (cooling) operation when other indoor
units are performing a cooling (heating) operation.
After an hour of cooling operation with the auto vane in the vertical position, the vane may automatically move into the horizontal position.
Louver blades will automatically move into the horizontal position while
the unit is in the defrost mode, pre-heating stand-by mode, or when the
thermostat triggers unit off.
The fan stops during heating
operation.
Defrost
The fan keeps running after
the unit has stopped.
Unlit
When the auxiliary heater is turned on, the fan operates for one minute
after stopping to dissipate heat.
STAND BY
The fan operates at extra low speed for 5 minutes after it is turned on or
until the pipe temperature reaches 35°C[95°F], then it operates at low
speed for 2 minutes, and finally it operates at the set speed.
(Pre-heating stand-by)
The fan speed does not reach
the set speed when operation
switch is turned on.
When the main power is
turned on, the display shown
on the right appears on the indoor unit remote controller for
5 minutes.
The drain pump keeps running after the unit has
stopped.
"HO" or "PLEASE
WAIT" icons blink
on the display.
Unlit
The drain pump is running
while the unit is stopped.
Normal display
Sound of the refrigerant flow is
heard from the indoor unit immediately after starting operation.
Normal display
HWE09070
The system is starting up. Wait until the blinking display of "HO" or
"PLEASE WAIT" go off.
The drain pump stays in operation for three minutes after the unit in the
cooling mode is stopped.
When drain water is detected, the drain pump goes into operation even
while the unit is stopped.
Indoor unit and WCB make
noise during cooling/heating
changeover.
Warm air sometimes comes
out of the indoor units that are
not in the heating mode.
The fan remains stopped during defrost operation.
Normal display
This noise is made when the refrigerant circuit is reversed and is normal.
This is caused by the transient instability of the refrigerant flow and is normal.
This is due to the fact that the LEVs on some of the indoor units are kept
slightly open to prevent the refrigerant in the indoor units that are not operating in the heating mode from liquefying and accumulating in the compressor. It is part of a normal operation.
- 56 -
GB
[ VII Test Run Mode ]
[4] Standard Operation Data (Reference Data)
1. Single unit (Standard) <PURY>
(1) Cooling only operation
Outdoor unit model
Operation
PURY-P250YHM-A
Model name of WCB
Ambient
temperature
CMB-PW202V-J
Indoor
DB/WB
Outdoor
No. of connected units
Indoor unit
Operating
conditions
No. of units in operation
Model
Unit
-
Branch pipe
m
[ft]
Total pipe length
Fan speed
LEV opening
Pressure
2
125/125
10 [32-3/4"]
25 [82]
Hi
kg
[lbs-oz]
18.5 [41]
Electric current
A
12.8
Voltage
V
400
Compressor frequency
Hz
65
Indoor unit
Pulse
WCB (1/3)
High pressure(63HS1)/
Low pressure(63LS)
Outdoor
unit
Temp. of
each section
2000/170
2.96/0.78
[429/113]
85 [185]
Heat exchanger outlet
(TH3)
39 [102]
Accumulator inlet
8 [46]
Accumulator outlet
8 [46]
Compressor shell bottom
WCB
MPa
[psi]
387/387
Discharge (TH4)
Compressor inlet
Indoor unit
HWE09070
2
-
Amount of refrigerant
Outdoor
unit
35°C/−
[95°F/−]
5 [16-3/8"]
Main pipe
Piping
27°C/19°C
[81°F/66°F]
°C
[°F]
LEV inlet
19 [66]
40 [104]
19 [66]
Heat exchanger outlet
6 [43]
Liquid pipe inlet (TH11)
37 [99]
LEV1 outlet (TH13)
37 [99]
- 57 -
GB
[ VII Test Run Mode ]
(2) Heating only operation
Outdoor unit model
Operation
PURY-P250YHM-A
Model name of WCB
Ambient
temperature
CMB-PW202V-J
Indoor
DB/WB
Outdoor
No. of connected units
Indoor unit
Operating
conditions
No. of units in operation
Model
Unit
-
Main pipe
Piping
Branch pipe
LEV opening
Pressure
2
125/125
10 [32-3/4"]
25 [82]
Hi
kg
[lbs-oz]
18.5 [41]
Electric current
A
12.1
Voltage
V
400
Compressor frequency
Hz
71
Indoor unit
Pulse
WCB (1/3)
High pressure(63HS1)/
Low pressure(63LS)
MPa
[psi]
Heat exchanger outlet
(TH6)
Outdoor
unit
Temp. of
each section
Compressor inlet
Indoor unit
WCB
110/590
2.90/0.64
[421/93]
0 [32]
Accumulator inlet
Accumulator outlet
406/406
80 [176]
Discharge (TH4)
HWE09070
2
-
Amount of refrigerant
Outdoor
unit
7°C/6°C
[45 °F/43 °F]
5 [16-3/8"]
m
[ft]
Total pipe length
Fan speed
20°C/−
[68 °F/-]
-2 [28]
°C
[°F]
-3 [27]
-3 [27]
Compressor shell bottom
40 [104]
LEV inlet
38 [100]
Heat exchanger outlet
70 [158]
HIC inlet (TH14)
37 [99]
- 58 -
GB
[ VII Test Run Mode ]
2. Single unit (High-COP) <PURY>
(1) Cooling only operation
Outdoor unit model
Operation
PURY-EP250YHM-A
Model name of WCB
Ambient
temperature
CMB-PW202V-J
Indoor
DB/WB
Outdoor
No. of connected units
Indoor unit
Operating
conditions
No. of units in operation
Model
Unit
-
Main pipe
Piping
Branch pipe
LEV opening
Pressure
2
125/125
10 [32-3/4"]
25 [82]
Hi
kg
[lbs-oz]
19.8 [43]
Electric current
A
11.0
Voltage
V
400
Compressor frequency
Hz
65
Indoor unit
Pulse
WCB (1/3)
High pressure(63HS1)/
Low pressure(63LS)
Outdoor
unit
Temp. of
each section
2000/170
2.60/0.78
[377/113]
77 [171]
Heat exchanger outlet
(TH3)
31 [88]
Accumulator inlet
8 [46]
Accumulator outlet
8 [46]
Compressor shell bottom
WCB
MPa
[psi]
387/387
Discharge (TH4)
Compressor inlet
Indoor unit
HWE09070
2
-
Amount of refrigerant
Outdoor
unit
35°C/−
[95 °F/−]
5 [16-3/8"]
m
[ft]
Total pipe length
Fan speed
27°C/19°C
[81 °F/66 °F]
°C
[°F]
LEV inlet
19 [66]
40 [104]
19 [66]
Heat exchanger outlet
6 [43]
Liquid pipe inlet (TH11)
29 [84]
LEV1 outlet (TH13)
29 [84]
- 59 -
GB
[ VII Test Run Mode ]
(2) Heating only operation
Outdoor unit model
Operation
PURY-EP250YHM-A
Model name of WCB
Ambient
temperature
CMB-PW202V-J
Indoor
DB/WB
Outdoor
No. of connected units
Indoor unit
Operating
conditions
No. of units in operation
Model
Unit
-
Main pipe
Piping
Branch pipe
LEV opening
Pressure
2
125/125
10 [32-3/4"]
25 [82]
Hi
kg
[lbs-oz]
19.8 [43]
Electric current
A
12.1
Voltage
V
400
Compressor frequency
Hz
69
Indoor unit
Pulse
WCB (1/3)
High pressure(63HS1)/
Low pressure(63LS)
MPa
[psi]
Heat exchanger outlet
(TH6)
Outdoor
unit
Temp. of
each section
Compressor inlet
Indoor unit
WCB
110/590
2.90/0.67
[421/97]
1 [34]
Accumulator inlet
Accumulator outlet
406/406
80 [176]
Discharge (TH4)
HWE09070
2
-
Amount of refrigerant
Outdoor
unit
7°C/6°C
[45 °F/43 °F]
5 [16-3/8"]
m
[ft]
Total pipe length
Fan speed
20°C/−
[68°F/-]
-1 [30]
°C
[°F]
-2 [28]
-2 [28]
Compressor shell bottom
41 [106]
LEV inlet
38 [100]
Heat exchanger outlet
70 [158]
HIC inlet (TH14)
37 [99]
- 60 -
GB
[ VII Test Run Mode ]
3. Single unit<PQRY>
(1) Cooling only operation
Heat source unit model
Item
PQRY-P200YHM-A
Model name of WCB
CMB-PW202V-J
Indoor temperature
DB/WB
27°C/19°C
[81 °F/66 °F]
Heat source water temperature
°C[ °F]
30.0[86]
Heat source water flow rate
m3/h
[G/h]
[G/min]
5.76
[1522]
[25.4]
No. of connected units
Operating
conditions
Indoor
unit
No. of units in operation
Model
Unit
−
Main pipe
Piping
Branch pipe
LEV opening
Pressure
10 [32-3/4]
25 [82]
Hi
kg
[lbs-oz]
13.0 [29]
Current
A
13.4
Voltage
V
400
Compressor frequency
Hz
90
Indoor unit
WCB (1/3)
High pressure(63HS1)
/Low pressure(63LS)
Heat
source
unit
Pulse
MPa
[psi]
387/387
2000/170
2.27/0.81
[329/117]
Discharge(TH4)
65 [149]
Heat exchanger outlet
34 [93]
Accumulator inlet
8 [46]
Accumulator outlet
8 [46]
Compressor inlet
Temp. of
each section
HWE09070
125/125
−
Refrigerant charge
Heat source
unit
2
5 [16-3/8]
m
[ft]
Total pipe length
Fan speed
2
Compressor shell bottom
°C
[ °F]
19 [66]
40 [104]
Indoor
unit
LEV inlet
19 [66]
Heat exchanger outlet
6 [43]
WCB
Liquid pipe inlet (TH11)
32 [90]
LEV1 outlet (TH13)
32 [90]
- 61 -
GB
[ VII Test Run Mode ]
(2) Heating only operation
Heat source unit model
Item
PQRY-P250YHM-A
Model name of WCB
CMB-PW202V-J
Indoor temperature
DB/WB
20°C/−
[68 °F/−]
Heat source water temperature
°C[ °F]
20.0[68]
Heat source water flow rate
m3/h
[G/h]
[G/min]
5.76
[1522]
[25.4]
No. of connected units
Operating
conditions
Indoor
unit
No. of units in operation
Model
Unit
−
Main pipe
Piping
Branch pipe
LEV opening
Pressure
10 [32-3/4]
25 [82]
Hi
kg
[lbs-oz]
13.0 [29]
Current
A
14.5
Voltage
V
400
Compressor frequency
Hz
72
Indoor unit
WCB (1/3)
High pressure(63HS1)
/Low pressure(63LS)
Pulse
MPa
[psi]
Discharge(TH4)
Heat
source
unit
Temp. of
each section
HWE09070
125/125
−
Refrigerant charge
Heat source
unit
2
5 [16-3/8]
m
[ft]
Total pipe length
Fan speed
2
406/406
110/590
2.90/0.80
[421/116]
80 [176]
Heat exchanger outlet
5 [41]
Accumulator inlet
4 [39]
Accumulator outlet
Compressor inlet
4 [39]
°C
[ °F]
4 [39]
Compressor shell bottom
40 [104]
Indoor
unit
LEV inlet
38 [100]
Heat exchanger inlet
70 [158]
WCB
HIC inlet (TH14)
37 [99]
- 62 -
GB
VIII Troubleshooting
[1]
[2]
[3]
[4]
HWE09070
Error Code Lists ............................................................................................................... 65
Responding to Error Display on the Remote Controller................................................... 66
Troubleshooting Principal Parts ....................................................................................... 87
Servicing the WCB...........................................................................................................97
- 63 -
GB
- 64 -
[ VIII Troubleshooting ]
[1] Error Code Lists
VIII Troubleshooting
Error
Code
Preliminary
error
code
Error
(preliminary)
detail
code
2502
-
-
5111
-
-
Liquid inlet temperature
(TH11)
5112
-
-
Bypass outlet temperature
(TH12)
5113
-
-
LEV1 outlet temperature
(TH13)
5114
-
-
5115
-
-
LEV3 outlet temperature
(TH15)
5116
-
-
LEV3 inlet temperature
(TH16)
6600
-
-
Address overlaps
6602
-
-
Transmission processor hardware error
6603
-
-
Transmission line bus busy error
6606
-
-
Communication error between device and transmission processors
6607
-
-
No ACK error
6608
-
-
No response error
7100
-
-
Total capacity error
7101
-
-
Capacity code setting error
7102
-
-
Wrong number of connected units
7105
-
-
Address setting error
7107
-
-
Port setting error
7130
-
-
Incompatible unit combination
HWE09070
Error code definition
Notes
Drain pump fault
Temperature sensor
fault
HIC inlet temperature
(TH14)
- 65 -
GB
[ VIII Troubleshooting ]
[2] Responding to Error Display on the Remote Controller
1. Error Code
2502
Drain pump fault (Models with a drain sensor)
2. Error definition and error detection method
1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in
water. This condition is considered to be a preliminary error, and the unit goes into the 3-minute restart delay mode.
2) If another episode of the above condition is detected during the preliminary error, this is considered a drain pump error, and
"2502" appears on the monitor.
3) This error is always detected while the drain pump is in operation.
4) The following criteria are met when the criteria for the forced stoppage of outdoor unit (system stoppage) are met.
∗"Liquid pipe temperature - inlet temperature - 10 °C [ -18°F] " has been detected for 30 minutes.
∗The immersion of drain sensor is detected 10 consecutive times.
∗The conditions that are listed under items 1) through 3) above are always met before the criteria for the forced stoppage
of the outdoor unit.
5) The indoor unit that detected the conditions that are listed in item 4) above brings the outdoor unit in the same refrigerant
circuit to an error stop (compressor operation prohibited), and the outdoor unit brings all the indoor units in the same refrigerant
circuit that are in any mode other than Fan or Stop to an error stop. "2502" appears on the monitor of the units that came to
an error stop.
6) Forced stoppage of the outdoor unit
Detection timing: The error is detected whether the unit is in operation or stopped.
7) Ending criteria for the forced stoppage of outdoor unit
Power reset the indoor unit that was identified as the error source and the outdoor unit that is connected to the same refrigerant circuit.
Forced stoppage of the outdoor unit cannot be cancelled by stopping the unit via the remote controller.
(Note) Items 1) - 3) and 4) - 7) are detected independently from each other.
The address and attribute that appear on the remote controller are those of the indoor unit (or OA processing unit)
that caused the error.
3. Cause, check method and remedy
Cause
Check method and remedy
(1)
Drain pump failure
Check for proper functioning of the drain pump.
(2)
Drain water drainage problem
ŒClogged drain pump
ŒClogged drain piping
Check for proper drainage.
(3)
Adhesion of water drops to the drain sensor
ŒTrickling of water along the lead wire
ŒRippling of drain water caused by filter clogging
1)
Check for proper lead wire installation.
2)
Check for clogged filter.
(4)
Indoor unit control board failure
ŒDrain pump drive circuit failure
ŒDrain heater output circuit failure
If the above item checks out OK, replace the indoor unit
control board.
(5)
Items (1) through (4) above and an indoor unit electronic valve closure failure (leaky valve) occurred simultaneously.
Check the solenoid valves on the indoor unit for leaks.
HWE09070
- 66 -
GB
[ VIII Troubleshooting ]
1. Error Code
2502
Drain pump fault (Models with a float switch)
2. Error definition and error detection method
1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch.
∗Submergence of the sensor
When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in
water.
∗Sensor in the air
When it is detected that the float switch has been OFF for 15 seconds, it is interpreted that the sensor tip is not immersed
in water.
2) If it is detected that the float switch has been ON for 3 minutes after the immersion of the sensor tip was detected, this is considered a drain pump failure, and "2502" appears on the monitor.
∗The total time it takes for this error to be detected is 3 minutes and 15 seconds, including the time it takes for the first immersion of the sensor tip to be detected.
3) Detection of drain pump failure is performed while the unit is stopped.
4) The following criteria are met when the criteria for the forced stoppage of outdoor unit (system stoppage) are met.
∗"Liquid pipe temperature - inlet temperature - 10°C [ -18°F] " has been detected for 30 minutes.
∗It is detected by the float switch that the sensor tip has been immersed in water for 15 minutes or more.
∗The conditions that are listed under items 1) through 3) above are always met before the criteria for the forced stoppage
of the outdoor unit.
5) The indoor unit that detected the conditions that are listed in item 4) above brings the outdoor unit in the same refrigerant
circuit to an error stop (compressor operation prohibited), and the outdoor unit brings all the indoor units in the same refrigerant
circuit that are in any mode other than Fan or Stop to an error stop.
6) Forced stoppage of the outdoor unit
Detection timing: The error is detected whether the unit is in operation or stopped.
This error is detected whether the unit is in operation or stopped.
7) Ending criteria for the forced stoppage of outdoor unit
Power reset the indoor unit that was identified as the error source and the outdoor unit that is connected to the same refrigerant circuit.
Forced stoppage of the outdoor unit cannot be cancelled by stopping the unit via the remote controller.
(Note) Items 1) - 3) and 4) - 7) are detected independently from each other.
The address and attribute that appear on the remote controller are those of the indoor unit (or OA processing unit)
that caused the error.
3. Cause, check method and remedy
Cause
Check method and remedy
(1)
Drain pump failure
Check for proper functioning of the drain pump
mechanism
(2)
Drain water drainage problem
ŒClogged drain pump
ŒClogged drain piping
Check for proper drainage.
(3)
Stuck float switch
Check for slime in the moving parts of the float switch.
Check for normal operation of the float switch.
(4)
Float switch failure
Check the resistance with the float switch turned
on and turned off.
(5)
Indoor unit control board failure
ŒDrain pump drive circuit failure
ŒFloat switch input circuit failure
Replace indoor unit control board.
(6)
Items (1) through (5) above and an indoor unit electronic
valve closure failure (leaky valve) occurred simultaneously.
Check the solenoid valves on the indoor unit for
leaks.
HWE09070
- 67 -
GB
[ VIII Troubleshooting ]
1. Error Code
5111
Liquid inlet temperature sensor (TH11) fault (WCB)
5112
Bypass outlet temperature sensor (TH12) fault (WCB)
5113
LEV1 outlet temperature sensor (TH13) fault (WCB)
5114
HIC inlet temperature sensor (TH14) fault (WCB)
5115
LEV3 outlet temperature sensor (TH15) fault (WCB)
5116
LEV3 inlet temperature sensor (TH16) fault (WCB)
2. Error definition and error detection method
ŒIf a shorted (high temperature intake) or open (low temperature intake) thermistor (TH11, TH12, TH13, TH14, TH15, or TH16)
is detected during operation, the unit makes an error stop, and an error code "5111," "5112," "5113," "5114," "5115," or "5116"
appears on the display.
ŒDetection of a short- or open-circuit as described above is suspended during the defrost cycle and for 3 minutes after the
operation mode is changed.
3. Cause, check method and remedy
Cause
Check method and remedy
(1)
Thermistor failure
Check thermistor resistance.
(2)
Pinched lead wire
Check for pinched lead wire.
(3)
Torn wire coating
Check for wire coating.
(4)
A pin on the male connector is missing or
contact failure
Check connector.
(5)
Disconnected wire
Check for wire.
(6)
Thermistor input circuit failure on the control
board
Check the intake temperature of the sensor with the LED monitor.
When the temperature is far different from the actual temperature,
replace the control board.
<Reference>
Short detection
TH11
TH12
TH13
TH14
TH15
TH16
HWE09070
110
110
110
110
70
110
C [230
C [230
C [230
C [230
C [158
C [230
Open detection
F ] and above (0.4 k
F ] and above (0.4 k
F ] and above (0.4 k
F ] and above (0.4 k
F ] and above (0.4 k
F ] and above (0.4 k
)
)
)
)
)
)
- 68 -
-40
-40
-40
-40
-40
-40
C [ -40
C [ -40
C [ -40
C [ -40
C [ -40
C [ -40
F ] and below (130 k
F ] and below (130 k
F ] and below (130 k
F ] and below (130 k
F ] and below (130 k
F ] and below (130 k
)
)
)
)
)
)
GB
[ VIII Troubleshooting ]
1. Error Code
6600
Address overlaps
2. Error definition and error detection method
An error in which signals from more than one indoor units with the same address are received
The address and attribute that appear on the remote controller indicate the controller that detected the error.
3. Cause, check method and remedy
Cause
Check method and remedy
(1)
Two or more of the followings have the same address:
Outdoor units, WCB, indoor units, LOSSNAY units,
controllers such as ME remote controllers.
<Example>
6600 "01" appears on the remote controller
Unit #01 detected the error.
Two or more units in the system have 01 as their address.
(2)
Electrical noise on the transmission wire distorted the
transmission signals.
HWE09070
- 69 -
Find the unit that has the same address as that of the error
source.
If address overlaps are detected, correct the address.
Then, turn off the power to the outdoor units, indoor
units, WCB, and LOSSNAY units, keep them all turned
off for at least five minutes, and turn them back on.
GB
[ VIII Troubleshooting ]
1. Error Code
6602
Transmission processor hardware error
2. Error definition and error detection method
Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line.
The address/attribute appeared on the display on the remote controller indicates the controller where an error occurred.
3. Cause
1) When the wiring work of or the polarity of either the indoor or outdoor transmission line is performed or is changed while the
power is on, the transmitted data will collide, the wave shape will be changed, and an error will be detected.
2) Grounding fault of the transmission line
3) When grouping the indoor units that are connected to different outdoor units, the male power supply connectors on the multiple
outdoor units are connected to the female power supply switch connector (CN40).
4) When the power supply unit for transmission lines is used in the system connected with MELANS, the male power supply
connector is connected to the female power supply switch connector (CN40) on the outdoor unit.
5) Controller failure of the source of the error
6) When the transmission data is changed due to the noise on the transmission line
7) Voltage is not applied on the transmission line for centralized control (in case of grouped indoor units connected to different
outdoor units or in case of the system connected with MELANS)
4. Check method and remedy
YES
Is the transmission line work
performed while the power is on?
Turn off the power source of outdoor/indoor
units, and turn them on again.
NO
Check the power source of the indoor unit.
NO
198 / 264V?
Faulty power source work
YES
Check the transmission line work is performed
and the shielded wire is treated properly.
Grounding fault or does the shielded
wire contact with the transmission line?
YES
Improper transmission line work
NO
System ?
Single-outdoor-unit system
Multiple-outdoor-unit system
System with the power supply
unit for transmission lines
Confirm that the power supply
connector on the outdoor
unit is not plugged into CN40.
Confirm that the power supply
connector on the outdoor
unit is not plugged into CN40.
Is the male power supply connector
connected to the female power supply
switch connector (CN40) on only one
of the outdoor unit?
YES
NO
Tightly reconnect the male power
supply connector to the female
power supply switch connector (CN40).
Investigation into the
transmission line noise
Noise exist?
NO
Is the male power supply connector
connected to the female power supply
switch connector (CN40) ?
YES
Disconnect the male
power supply on
CN40 and connect it to CN41
*For the investigation method, follow
<Investigation method of transmission wave shape/noise>
YES
Investigation into the
cause of the noise
NO
Controller failure of the
source of the error
Correct the error.
HWE09070
- 70 -
GB
[ VIII Troubleshooting ]
1. Error Code
6603
Transmission line bus busy error
2. Error definition and error detection method
ŒGenerated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy
ŒGenerated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise
The address/attribute appeared on the display on the remote controller indicates the controller where an error occurred.
3. Cause, check method and remedy
Cause
Check method and remedy
(1)
The transmission processor cannot be transmitted as the short-wavelength voltage like noise exists consecutively on the transmission line.
(2)
Error source controller failure
No noise indicates that the error source controller is a failure. If noise exists, investigate the noise.
-> No noise indicates that the error source controller is a
failure.
-> If noise exists, investigate the noise.
1. Error Code
6606
Communication error between device and transmission processors
2. Error definition and error detection method
Communication error between the main microcomputer on the indoor unit board and the microcomputer for transmission
The address/attribute appeared on the display on the remote controller indicates the controller where an error occurred.
3. Cause, check method and remedy
Cause
Check method and remedy
(1)
Data is not properly transmitted due to accidental
erroneous operation of the controller of the error
source.
(2)
Error source controller failure
HWE09070
- 71 -
Turn off the power source of the outdoor and the indoor
units.(When the power source is turned off separately, the
microcomputer will not be reset, and the error will not be
corrected.)
-> If the same error occurs, the error source controller is
a failure.
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(1) System with one outdoor unit
Error
source
address
Error display
Detection
method
Outdoor ME reunit (OC) mote controller
(RC)
MA remote controller
(MA)
No acknowledgement
(ACK) at
IC transmission to
OC
WCB
(BC)
Indoor
unit (IC)
LOSSNAY
(LC)
ME remote
controller (RC)
HWE09070
ME remote controller
(RC)
MA remote controller
(MA)
No acknowledgement
(ACK) at
IC transmission to
BC
ME remote controller
(RC)
MA remote controller
(MA)
No acknowledgement
(ACK) at
RC transmission to
IC
ME remote controller
(RC)
MA remote controller
(MA)
ME remote controller
(RC)
MA remote controller
(MA)
No acknowledgement
(ACK) at
IC transmission to
LC
No acknowledgement
(ACK) at
IC transmission to
RC
Cause
(1)
Contact failure of transmission line of OC or IC
(2)
Decrease of transmission line voltage/signal by exceeding acceptable range of transmission wiring.
Farthest:200 m [656ft] or less
Remote controller wiring:10m [32ft] or less
(3)
Erroneous sizing of transmission line (Not within the
range below). Wire diameter:
1.25mm2 [AWG16] or more
(4)
Indoor unit control board failure
(1)
When WCB address is changed or modified during
operation.
(2)
Faulty or disconnected transmission wiring of WCB
(3)
Disconnected connector of WCB (CN02)
(4)
Faulty control board of WCB
(1)
When IC unit address is changed or modified during
operation.
(2)
Faulty or disconnected IC transmission wiring
(3)
Disconnected IC connector
(CN2M)
(4)
Indoor unit controller failure
(5)
ME remote controller failure
(1)
The power source of LOSSNAY has been shut off.
(2)
When the address of LOSSNAY is changed in the
middle of the operation
(3)
Faulty or disconnected transmission wiring of
LOSSNAY
(4)
Disconnected connector (CN1) on LOSSNAY
(5)
Controller failure of LOSSNAY
(1)
Faulty transmission wiring at IC unit side.
(2)
Faulty wiring of the transmission line for ME remote
controller
(3)
When the address of ME remote controller is
changed in the middle of the operation
(4)
ME remote controller failure
- 72 -
Check method and remedy
Turn off the power
source of the outdoor
unit, and turn it on again.
If the error is accidental,
it will run normally. If not,
check the causes (1) (4).
Keep the power to the
outdoor units and WCB
turned off simultaneously for at least five minutes, and turn them
back on.
If the error is accidental,
they will run normally. If
not, check the causes
(1) - (4).
Turn off the outdoor/indoor units for 5 or more
minutes, and turn them
on again.
If the error is accidental,
they will run normally.
If not, check the causes
(1) - (5).
Turn off the power
source of LOSSNAY
and turn it on again.
If the error is accidental,
it will run normally.
If not, check the causes
(1) - (5).
Turn off the power
source of the outdoor
unit for 5 minutes or
more, and turn it on
again.
If the error is accidental,
it will run normally.
If not, check the causes
(1) - (4).
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(2) Grouping of units in a system with multiple outdoor units
Error
source
address
Error display
Detection
method
Cause
Check method and remedy
Outdoor
unit
(OC)
ME remote
controller (RC)
MA remote
controller (MA)
No acknowledgement
(ACK) at IC
transmission to
OC
Same cause as that for system
with one outdoor unit
Same remedy as that for system with one outdoor unit
WCB
(BC)
ME remote
controller
(RC)
MA remote
controller
(MA)
No acknowledgement
(ACK) at IC
transmission to
BC
Same cause as that for system
with one outdoor unit
Same remedy as that for system with one outdoor unit
Indoor
unit
(IC)
ME remote
controller (RC)
MA remote
controller (MA)
No acknowledgement
(ACK) at RC
transmission to
IC
(1)
Same causes as (1) - (5) for system with one outdoor unit
1)
Turn off the power sources of
the outdoor and indoor units
for 5 or more minutes, and turn
them on again. If the error is
accidental, the will run normally.If not, check the cause 2).
(2)
Disconnection or short circuit of
the transmission line for the outdoor unit on the terminal block for
centralized control line connection
(TB7)
2)
Check the causes of (1) - (5). If
the cause is found, correct it. If
no cause is found, check 3).
(3)
When multiple outdoor units are
connected and the power source
of one of the outdoor units has
been shut off.
3)
Check the LED displays for
troubleshooting on other remote controllers whether an
error occurs.
(4)
The male power supply connector
of the outdoor unit is not connected to the female power supply
switch connector (CN40).
(5)
The male power supply connectors on 2 or more outdoor units
are connected to the female power supply switch connector
(CN40) for centralized control.
If an error is found,
-> If an error is found, check
the check code definition, and
correct the error.
If no error is found,
-> Indoor unit board failure
If an error occurs, after the unit
runs normally once, the following
causes may be considered.
ŒTotal capacity error (7100)
ŒCapacity code error (7101)
ŒError in the number of connected units (7102)
ŒAddress setting error (7105)
HWE09070
- 73 -
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(2) Grouping of units in a system with multiple outdoor units
Error
source
address
LOSSNAY
(LC)
Error display
ME remote
controller (RC)
MA remote
controller (MA)
Detection
method
No acknowledgement
(ACK) at IC
transmission to
LC
Cause
Check method and remedy
(1)
Factors (1) through (5) in the 1)
"Factors in system with one
outdoor unit" (When performing an interlocked operation
of the LOSSNAY unit and the
indoor units that are connected to different outdoor units.)
Turn off the power source of
LOSSNAY for 5 or more minutes, and turn it on again. If the
error is accidental, it will run
normally.If not, check the
cause 2).
(2)
Disconnection or short circuit 2)
of the transmission line for
the outdoor unit on the terminal block for centralized control line connection (TB7)
Check the causes of (1) - (5). If
the cause is found, correct it. If
no cause is found, check 3).
(3)
When multiple outdoor units
are connected and the power
source of one of the outdoor
units has been shut off.
Same cause as that for indoor
unit described in 3)
(4)
The male power supply connector of the outdoor unit is
not connected to the female
power supply switch connector (CN40).
(5)
The male power supply connectors on 2 or more outdoor
units are connected to the female power supply switch
connector (CN40) for centralized control.
3)
If an error occurs, after the
unit runs normally once, the
following causes may be considered.
ŒTotal capacity error
(7100)
ŒCapacity code error
(7101)
ŒError in the number of
connected units (7102)
ŒAddress setting error
(7105)
HWE09070
- 74 -
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(2) Grouping of units in a system with multiple outdoor units
Error
source
address
Error display
ME remote controller
(RC)
ME remote
controller (RC)
MA remote
controller (MA)
Detection
method
No acknowledgement
(ACK) at IC
transmission to
RC
Cause
Check method and remedy
(1)
Same causes as (1) - (4) for
system with one outdoor unit
1)
Turn off the power source of
LOSSNAY for 5 or more minutes, and turn it on again. If the
error is accidental, it will run
normally.If not, check the
cause 2).
(2)
Disconnection or short circuit 2)
of the transmission line for
the outdoor unit on the terminal block for centralized control line connection (TB7)
Check the causes of (1) - (5). If
the cause is found, correct it. If
no cause is found, check 3).
(3)
When multiple outdoor units
are connected and the power
source of one of the outdoor
units has been shut off.
3)
Same cause as that for indoor
unit described in 3)
(4)
The male power supply connector of the outdoor unit is
not connected to the female
power supply switch connector (CN40).
(5)
The male power supply connectors on 2 or more outdoor
units are connected to the female power supply switch
connector (CN40) for centralized control.
If the problem recurs after
normal operation is restored,
the problem is caused by one
of the following factors:
ŒTotal capacity error
(7100)
ŒCapacity code setting
error (7101)
ŒError in the number of
connected units (7102)
ŒAddress setting error
(7105)
HWE09070
- 75 -
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(3) System connected to the system controllers (MELANS)
Error
source
address
Error display
Detection
method
Cause
Check method and remedy
Outdoor
unit
(OC)
ME remote
controller (RC)
System controller (SC)
MA remote
controller (MA)
No acknowledgement
(ACK) at IC
transmission to OC
Same cause as that for system with one
outdoor unit
Same remedy as that for
system with one outdoor
unit
WCB
(BC)
ME remote
controller (RC)
system controller (SC)
MA remote
controller (MA)
No acknowledgement
(ACK) at IC
transmission to BC
Same cause as that for system with one
outdoor unit
Same remedy as that for
system with one outdoor
unit
HWE09070
- 76 -
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(3) System connected to the system controllers (MELANS)
Error
source
address
Indoor
unit
(IC)
Error display
ME remote
controller (RC)
MA remote
controller (MA)
Detection
method
Cause
No acknowledgement
(ACK) at RC
transmission to IC
System control- No acknowl- 1.
ler (SC)
edgement
(ACK) at SC (1)
transmission to IC
2.
HWE09070
Check method and remedy
Same as grouping of units in a system
with multiple outdoor units
Same remedy as that for
grouping of units in a system with multiple outdoor
units
Error occurrence on some IC
Same remedy as that for
system with one outdoor
unit
Same cause as that for system with one
outdoor unit
Error occurrence on all IC in the system
with one outdoor unit
1) Check the LED display
for troubleshooting on the
outdoor unit.
(1)
Total capacity error (7100)
(2)
Capacity code error (7101)
(3)
Error in the number of connected units
(7102)
(4)
Address setting error (7105)
(5)
Disconnection or short circuit of the trans- 2) Check (5) - (7) on the left.
mission line for the outdoor unit on the terminal block for centralized control line
connection (TB7)
(6)
Turn off the power source of the outdoor
unit
(7)
Malfunction of electrical system for the
outdoor unit
3.
Error occurrence on all IC
(1)
Same causes as (1) - (7) described in 2.
(2)
The male power supply connectors on 2
or more outdoor units are connected to
the female power supply switch connector
(CN40) for the transmission line for centralized control.
(3)
Disconnection or shutdown of the power
source of the power supply unit for transmission line
(4)
System controller (MELANS) malfunction
- 77 -
ŒIf an error is found,
check the check code
definition, and correct
the error.
ŒIf no error is found,
check 2).
Check voltage of the
transmission line for centralized control.
Œ20V or more: Check (1)
and (2) on the left.
ŒLess than 20V: Check
(3) on the left.
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(3) System connected to the system controllers (MELANS)
Error
source
address
ME remote controller
(RC)
Error display
Detection
method
ME remote
controller (RC)
System controller (SC)
MA remote
controller (MA)
No acknowledgement
(ACK) at IC
transmission to
RC
System controller
(SC)
No acknowledgement
(ACK) at
MELANS
transmission to
RC
Cause
1.
Check method and remedy
Same as grouping of units in a system with multiple outdoor units
Same remedy as that for
grouping of units in a system
with multiple outdoor units
Error occurrence on some IC
Same remedy as that for
system with one outdoor unit
(1) Same cause as that for system
with one outdoor unit
2.
Error occurrence on all IC in the
system with one outdoor unit
1)
ΠIf an error is found, check
the check code definition,
and correct the error.
ŒIf no error is found, check
the cause 2).
(1) An error is found by the outdoor
unit.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connected
units (7102)
Address setting error (7105)
(2) Disconnection or short circuit of the
transmission line for the outdoor
unit on the terminal block for centralized control line connection
(TB7)
Check the LED display for
troubleshooting on the outdoor unit.
2)
Check (2) - (4) on the left.
(3) Turn off the power source of the
outdoor unit
(4) Malfunction of electrical system for
the outdoor unit
3.
Error occurrence on all IC
Check (1) - (4) on the left.
(1) Same causes as (1) - (4) described
in 2.
(2) When the power supply unit for
transmission lines is used and the
male power supply connector is
connected to the female power
supply switch connector (CN40) for
the transmission line for centralized control
(3) Disconnection or shutdown of the
power source of the power supply
unit for transmission line
(4) System controller (MELANS) malfunction
HWE09070
- 78 -
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(3) System connected to the system controllers (MELANS)
Error
source
address
System
controller
(SC)
HWE09070
Error display
ME remote
controller
(RC)
MA remote
controller
(MA)
Detection
method
No acknowledgement
(ACK) at IC
transmission to
SC
Cause
1.
Error display on some displays on
ME remote controllers
(1)
Faulty wiring of the transmission
line for ME remote controller
(2)
Disconnection or contact failure of
the transmission connector for ME
remote controller
(3)
ME remote controller failure
2.
Error occurrence on all IC in the
system with one outdoor unit
(1)
An error is found by the outdoor
unit.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connected
units (7102)
Address setting error (7105)
(2)
Disconnection or short circuit of the
transmission line for the outdoor
unit on the terminal block for centralized control line connection
(TB7)
(3)
Turn off the power source of the
outdoor unit
(4)
Malfunction of electrical system for
the outdoor unit
3.
Error display on all displays on ME
remote controllers
(1)
Same causes as (1) - (4) described
in 2.
(2)
When the power supply unit for
transmission lines is used and the
male power supply connector is
connected to the female power supply switch connector (CN40) for the
transmission line for centralized
control
(3)
Disconnection or shutdown of the
power source of the power supply
unit for transmission line
(4)
System controller (MELANS) malfunction
- 79 -
Check method and remedy
Check (1) - (3) on the left.
1) Check the LED display for
troubleshooting on the outdoor unit.
ΠIf an error is found, check
the check code definition,
and correct the error.
ŒIf no error is found, check
the cause 2)
2) Check (2) - (4) on the left.
Check (1) - (4) on the left
GB
[ VIII Troubleshooting ]
1. Error Code
6607
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is transmitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(4) Errors that are not limited to a particular system
Error
source address
Address
which
should not
be existed
Error display
Detection
method
-
-
Cause
(1)
Although the address of ME
remote controller has been
changed after the group is set
using ME remote controller,
the indoor unit is keeping the
memory of the previous address. The same symptom will
appear for the registration with
SC.
(2)
Although the address of
LOSSNAY has been changed
after the interlock registration
of LOSSNAY is made using
ME remote controller, the indoor unit is keeping the memory of the previous address.
Check method and remedy
Delete unnecessary information of non-existing address
which some indoor units have.
Use either of the following two
methods for deletion.
1)
Address deletion by ME remote
controller
Delete unnecessary address information using the manual setting function of ME remote
controller. Refer to section [2]
"Group setting and Interlock
setting via the ME remote controller 1.(3) Address deletion" in
Chapter IV in R2 service handbook.
2)
Deletion of connection information of the outdoor unit by the
deleting switch
Note that this switch deletes
all the group information set
via ME remote controller and
all the interlock information
of LOSSNAY and the indoor
unit.
ŒTurn off the power source of
the outdoor unit, and wait for
5 minutes.
ŒTurn on the dip switch (SW22) on the outdoor unit control
board.
ŒTurn on the power source of
the outdoor unit, and wait for
5 minutes.
ŒTurn off the power source of
the outdoor unit, and wait for
5 minutes.
ŒTurn off the dip switch (SW22) on the outdoor unit control
board.
ΠTurn on the power source of
the outdoor unit.
HWE09070
- 80 -
GB
[ VIII Troubleshooting ]
1. Error Code
6608
No response error
2. Error definition and error detection method
ŒWhen no response command is returned although acknowledgement (ACK) is received after transmission, an error is detected.
ŒWhen the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side.
The address/attribute appeared on the display on the remote controller indicates the controller where an error occurred.
3. Cause
1) The transmission line work is performed while the power is on, the transmitted data will collide, and the wave shape will be
changed.
2) The transmission is sent and received repeatedly due to noise.
3) Decrease of transmission line voltage/signal by exceeding acceptable range of transmission wiring.
Farthest:200m [656ft] or less
Remote controller wiring:12m [39ft] or less
4) The transmission line voltage/signal is decreased due to erroneous sizing of transmission line.
Wire diameter: 1.25mm2[AWG16] or more
4. Check method and remedy
1) When an error occurs during commissioning, turn off the power sources for the outdoor unit, indoor unit, WCB, and LOSSNAY
for 5 or more minutes, and then turn them on again.
ΠWhen they return to normal operation, the cause of the error is the transmission line work performed with the power on.
ŒIf an error occurs again, check the cause 2).
2) Check 3) and 4) above.
ŒIf the cause is found, correct it.
ΠIf no cause is found, check 3).
3) Check transmission wave shape/ noise on transmission line by following the instructions in section "[3] Investigation of Transmission Wave Shape/Noise" in Chapter IX in R2 service handbook.
Noise is the most possible cause of the error "6608".
HWE09070
- 81 -
GB
[ VIII Troubleshooting ]
1. Error Code
7100
Total capacity error
2. Error definition and error detection method
The model total of indoor units in the system with one outdoor unit exceeds limitations.
3. Error source, cause, check method and remedy
Error source
Outdoor unit
Cause
(1)
(2)
Check method and remedy
The model total of indoor units in the sys- 1)
tem with one outdoor unit exceeds the following table.
Check the model total (capacity code total) of indoor units connected.
2)
Check the model name (capacity code) of the
connected indoor unit set by the switch (SW2 on
indoor unit board).
Model
Capacity Total
(E)P200 model
260
(E)P250 model
325
(E)P300 model
390
P350 model
455
The model selection switches (SW5-1 - 54) on the outdoor unit are set incorrectly.
Model
Check the setting for the model selection switch
on the outdoor unit (Dipswitches SW5-1 - 5-4 on
the outdoor unit control board).
SW5
1
2
3
4
(E)P200 model OFF ON
OFF OFF
(E)P250 model ON
OFF OFF
ON
(E)P300 model OFF OFF ON
P350 model OFF ON ON
HWE09070
When the model name set by the switch is different from that of the unit connected, turn off the
power source of the outdoor and the indoor units,
and change the setting of the model name (capacity code).
OFF
OFF
- 82 -
GB
[ VIII Troubleshooting ]
1. Error Code
7102
Wrong number of connected units
2. Error definition and error detection method
The number of connected indoor units is "0" or exceeds the allowable value.
3. Error source, cause, check method and remedy
Error source
Outdoor unit
Cause
(1)
Check method and remedy
Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmission lines exceeds limitations described below.
Number of units
Restriction on the number of units
Total number of indoor units
1 - 17 : P200 model
1)
Check whether the number of units connected to the outdoor terminal block
(TB3) for indoor/ outdoor transmission
lines does not exceed the limitation. (See
(1) and (2) on the left.)
2)
Check (2) - (3) on the left.
3)
Check whether the transmission line for
the terminal block for centralized control
(TB7) is not connected to the terminal
block for the indoor/outdoor transmission
line (TB3).
4)
Check the setting for the model selection
switch on the outdoor unit (Dipswitches
SW5-7 on the outdoor unit control board).
1 - 21 : P250 models
1 - 26 : P300 models
1 - 30 : P350 models
Number of WCB
Total number of LOSSNAY
units (During auto address
start-up only)
1
(P200 - P350 models only)
0 or 1
Total number of outdoor units 1 : P200 - P350, EP200-EP300 models
(2)
Disconnected transmission line from the outdoor
unit or WCB
(3)
Short-circuited transmission line
When (2) and (3) apply, the following display will
appear.
ŒME remote controller
Nothing appears on the remote controller because it is not powered.
ŒMA remote controller
"HO" or "PLEASE WAIT" blinks.
HWE09070
(4)
The model selection switch (SW5-7) on the outdoor unit is set to OFF. (Normally set to ON)
(5)
Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
- 83 -
GB
[ VIII Troubleshooting ]
1. Error Code
7105
Address setting error
2. Error definition and error detection method
Erroneous setting of OC unit address
Erroneous setting of WCB address
3. Cause, check method and remedy
Error source
Outdoor unit
WCB
HWE09070
Cause
Check method and remedy
Erroneous setting of OC unit address
The address of outdoor unit is not being set to 51 100.
The address of WCB is not set to 51 - 100.
- 84 -
Check that the outdoor unit and WCB addresses are set to 00 or a number between 51 and
100.
If the outdoor unit address is out of the valid
range, reset the address with the power to the
outdoor unit turned off.
If the WCB address is out of the valid range, reset the address with the power to both the outdoor unit and WCB turned off.
GB
[ VIII Troubleshooting ]
1. Error Code
7107
Port setting error
2. Error definition and error detection method
The port with wrong number is connected to the indoor unit.The model total connected to the port is greater than the specification.
3. Cause, check method and remedy
Error source
WCB
Cause
(1)
(2)
Model total of indoor units per each port or per
each port merge is greater than the specification.
Port
Model total
Indoor unit/PWFY port
525
PWFY port
350
Before resetting the port number using
the port number setting switch or the
model using the model (capacity code)
setting switch, turn off the power of the
outdoor unit, the WCB and the indoor
unit.
The port number for indoor unit has not been set
according to the table below.
Port
(3)
Check method and remedy
Port number
Indoor unit/PWFY port
0
PWFY port
1
The port number for indoor unit has been set to "1,"
which is the port number for PWFY.
Is the model total of indoor
units connected to the same port
greater than the item (1)?
YES
NO
Port No. setting error?
YES
Change the port No.
NO
The wrong model
(capacity code) is set.
YES
Change the set
indoor unit model
(capacity code).
NO
Change the port No.
HWE09070
- 85 -
Adjust the piping
connection to the port.
GB
[ VIII Troubleshooting ]
1. Error Code
7130
Incompatible unit combination
2. Error definition and error detection method
An error code appears when the connected indoor units or outdoor units are for use with other types of refrigerant.
3. Error source, cause, check method and remedy
Error source
Outdoor unit
HWE09070
Cause
Check method and remedy
The connected outdoor unit is for use with a
refrigerant other than R410A.
The connected outdoor unit is old type (older
than YGM or YHM with a S/W version that
does not support WCB).
Incorrect type of indoor units are connected.
The M-NET connection adapter is connected
to the indoor unit system in a system in which
the Slim Model (A control) of units are connected to the M-NET.
- 86 -
Check the model names of the connected indoor units and outdoor units.
Check whether the connecting adapter for
M-NET is not connected to the indoor unit.
(Connect the connecting adapter for M-NET
to the outdoor unit.)
GB
[ VIII Troubleshooting ]
[3] Troubleshooting Principal Parts
-1- LEV
LEV operation
LEV are stepping-motor-driven valves that operate by receiving the pulse signals from the indoor and outdoor unit control
boards.
(1) Indoor LEV and BC controller LEV
The valve opening changes according to the number of pulses.
1) Control boards and the LEV
Outdoor control board
Intermediate connector
LEV
4 Blue
DC12V
2
Brown
6
5
Red
5
4
4
Drive circuit
M
6
Brown
4
1
Blue
2 Yellow
3
3
3
Orange
3
3
5
2
4
Yellow
2
2
1
6
White
1
1
1
White Red Orange
Connector
Indoor unit connector CN60
Control board CNLV1,CNLV2
Note. The connector numbers on the intermediate connector and the connector on the control board differ. Check the color of the lead wire
to judge the number.
2) Pulse signal output and valve operation
Output
(phase)
number
Output state
1
1
ON
2
OFF
3
OFF
4
ON
2
3
ON
OFF
ON
ON
OFF
ON
OFF
OFF
4
OFF
OFF
ON
ON
Output pulses change in the following orders when the
Valve is closed; 1
2
3
4
1
Valve is open; 4
3
2
1
4
*1. When the LEV opening angle does not change,
all the output phases will be off.
*2. When the output is open phase or remains ON,
the motor cannot run smoothly, and rattles and vibrates.
3) LEV valve closing and opening operation
Valve opening (refrigerant flow rate)
D
C
*When the power is turned on, the valve closing signal of 2200 pulses
will be output from the indoor board to LEV to fix the valve position.
It must be fixed at point A.
When the valve operates smoothly, no sound from LEV or no vibration
occurs, however, when the pulses change from E to A in the chart or
the valve is locked, a big sound occurs.
*Whether a sound is generated or not can be determined by
holding a screwdriver against it, then placing your ear against the handle.
Valve closed
Valve open
A
Fully open: 1400 pulses
E
B
Pulses
80 - 100 pulses
HWE09070
- 87 -
GB
[ VIII Troubleshooting ]
(2) Judgment methods and possible failure mode
Malfunction
mode
Microcomputer
driver circuit failure
Judgment method
Remedy
Disconnect the control board connector and connect
the check LED as shown in the figure below.
6
When the drive circuit has a
problem, replace the control
board.
5
4
3
2
1k
LED
1
resistance : 0.25W 1k
LED : DC15V 20mA or more
When the main power is turned on, the indoor unit circuit board outputs pulse signals to the indoor unit LEV
for 10 seconds.
If any of the LED remains lit or unlit, the drive circuit is
faulty.
LEV mechanism
is locked
If the LEV is locked, the drive motor runs idle, and
makes a small clicking sound.
When the valve makes a closing and opening sound,
the valve has a problem.
Replace the LEV.
Disconnected or
short-circuited
LEV motor coil
Measure resistance between the coils (red - white, red
-orange, brown - yellow, brown - blue) using a tester.
They are normal if resistance is 150ohm 10%.
Replace the LEV coils.
If there is a large amount of
Incomple sealing When checking the refrigerant leak from the indoor
(leak from the
LEV, run the target indoor unit in the fan mode, and the leakage, replace the LEV.
valve)
other indoor units in the cooling mode. Then, check the
liquid temperature (TH22) with the self-diagnosis LED.
When the unit is running in the fan mode, the LEV is fully closed, and the temperature detected by the thermistor is not low. If there is a leak, however, the
temperature will be low. If the temperature is extremely
low compared with the inlet temperature displayed on
the remote controller, the LEV is not properly sealed,
however, if there is a little leak, it is not necessary to replace the LEV when there are no effects to other parts.
Thermistor
(liquid piping
temperature detection)
Linear Expansion Valve
Faulty wire connections in the
connector or
faulty contact
HWE09070
1.
Check for loose pins on the connector and check
the colors of the lead wires visually
2.
Disconnect the control board's connector and
conduct a continuity check using a tester.
- 88 -
Check the continuity at the
points where an error occurs.
GB
[ VIII Troubleshooting ]
-2- Troubleshooting Principal Parts of WCB
1. Temperature sensor
Troubleshooting instructions for thermistor
START
Note 1
Pull out the thermistor connector in
trouble from the board.
Note 2
Measure the temperature of the thermistor
in trouble. (actual measurement value)
Note 2
Check the thermistor resistor.
Compare the temperature corresponding to the
resistance measured by the thermistor and the
temperature measured by a commercially
available thermometer, and check whether
there is no difference between them.
Temperature difference
NO
YES
Replace the thermistor
Note 3
Insert the connector of the thermistor
in trouble into the board, check the sensor
inlet temperature on the LED monitor,
and check the temperature difference.
Temperature difference
YES
Check for contact failure.
NO
Replace the control board.
Normal
HWE09070
- 89 -
GB
[ VIII Troubleshooting ]
1) TH11 through TH14 are connected to CN10 and TH15 and TH16 are connected to CN11 on the circuit board. Unplug the
corresponding connectors before checking each sensor.
2)
ŒPull out the sensor connector from the I/O board, Do not pull the sensor by holding the lead wire.
ŒMeasure the resistance with such as a tester.
ŒCompare the measured value with that of shown in the figure below. When the result is 10%, it is normal.
3) Check the self-diagnosis switch (Outdoor control board SW1).
Measurement data
Symbol
SW1 setting value
1 2 3 4 5 6 7 8 9 10
Liquid inlet temperature
TH11
ON
Bypass outlet temperature
TH12
ON
LEV1 outlet temperature
TH13
ON
HIC inlet temperature
TH14
ON
Bypass inlet temperature
TH15
ON
Bypass inlet temperature
TH16
ON
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
WCB
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
HWE09070
- 90 -
GB
[ VIII Troubleshooting ]
2. Troubleshooting flow chart for LEV Solenoid valve
(1) LEV
No cooling capacity
No heating capacity
Note 1
Check whether the electric expansion
valve and the solenoid valve connector
are not disconnected or not loose.
NO
Fault is found.
Repair the fault.
Run the cooling operation or the heating
operation in the system in trouble
(only in one system).
Heating operation
Cooling or heating operation
Cooling operation
Note 2
Note 2
Check that LEV1 is fully open.
Check that LEV1 is fully closed.
NO
NO
LEV1 is fully closed.
LEV1 is fully open.
YES
Note 3
YES
Check LEV1.
Check that LEV3 is modulating the
differential temperature.
Check whether LEV3 is controlling
superheat.
NO
NO
Differential temperature control OK
Superheat control OK
YES
Note 3
Check LEV3.
YES
Completed
HWE09070
- 91 -
GB
[ VIII Troubleshooting ]
1) WCB: Phenomena when LEV is connected wrongly (reverse connection of LEV1 and LEV3) to the board.
Phenomena
Cooling only
Cooling main
Heating only
Non-cooling
SC12 small
SC16 small, branch pipe
SC small
WCB sound
Non-cooling and non-heating
SH12 small
SH16 large, but branch pipe
SC small
WCB sound
THM large
Poor heating performance
Indoor heating SC small
THM large
Heating main
Non-cooling
Indoor heating SC small
THM large
2) Check method of fully open state or fully closed state of LEV
ŒCheck LEV opening (pulse) on the self-diagnosis LED (Outdoor control board SW1).
Full open: 2000 pulses
Fully closed: 110 pulses (In the case of heating-only mode, however, the pulse may become 110 or more.)
ŒWhen LEV is fully open, measure the temperature at the upstream and downstream pipes of LEV, and make sure that there
is no temperature difference.
ŒWhen LEV is fully closed, check that there is no refrigerant flowing sound.
3) Refer to the table below to determine the correct amount of LEV opening, which are controlled by the values of the differential
temperature and of the superheat.
(WCB LEV basic operation characteristic)
Part
Malfunction
mode
Operation
mode
Cooling
main
Inclined to
close
LEV1
WCB
Inclined to
close
LEV3
Inclined to
open
HWE09070
Difference between TH11
and TH13 is large.
Difference between outHeating only
door unit condensation
Heating
temperature and TH14 is
main
large.
Cooling
main
Inclined to
open
Content
Standards of judgment on
unit stable operation
Cooling main:
5 to 7°C [9 to 12.6°F]
Heating only, Heating
main:
10 to 16°C [18 to 28.8°F]
Difference between TH11
and TH13 is small.
Difference between outHeating only
door unit condensation
Heating
temperature and TH14 is
main
small.
Cooling only
Cooling
SH12 is large.
main
Difference between outHeating only
door unit condensation
Heating
temperature and TH14 is
main
small.
Cooling only
Cooling
SC16 and SH12 are small.
main
Difference between outHeating only
door unit condensation
Heating
temperature and TH14 is
main
large.
- 92 -
SH12 < 20°C [36°F]
10 to 16°C
[18 to 28.8°F]
SC16 > 3°C [5.4°F]
SH12 > 3°C [5.4°F]
10 to 16°C
[18 to 28.8°F]
GB
[ VIII Troubleshooting ]
Self-diagnosis LED
Measurement data
Symbol
SW1 setting value
1 2 3 4 5 6 7 8 9 10
LEV1 opening
ON
LEV3 opening
ON
1 2 3 4 5 6 7 8 9 10
WCB
1 2 3 4 5 6 7 8 9 10
WCB bypass
outlet superheat
SH12
ON
WCB intermediate
part subcool
SC16
ON
WCB liquid-side subcool
SC14
ON
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
HWE09070
- 93 -
GB
[ VIII Troubleshooting ]
Troubleshooting flowchart for the LEV
Start
Check for pins not fully inserted on the connector
and check the colors of the lead wires visually.
Intermediate connector
To
LEV
Control board
2 Brown
5 Red
1 Blue
3 Orange
4 Yellow
6 White
Brown
Red
Blue
Orange
Yellow
White
OK?
When LEV is fully closed : tick sound
When LEV is fully open : no sound
Check the above.
6
5
4
3
2
1
OK?
YES
Repair the fault.
OK?
Pull out the connector from the board, and check
that the electricity runs with a tester.
The wiring side of CN05 and 07: Among 1, 3 and 5,
and among 2, 4 and 6
OK?
Repair the fault.
Check the resistance between each coil
with a tester (between red and white,
red and orange, brown and yellow and
brown and blue), and check that the
resistance is 150 within 10%.
OK?
YES
NO
YES
NO
YES
Replace LEV.
Check that no refrigerant
leaks from LEV.
NO
YES
NO
Replace LEV.
6
5
4
3
2
1
Connect the LED for check,
which is as shown in the
right figure, to the board
connector, and check that
the LED keeps lighting for
10 seconds.
10 k
NO
OK?
Replace LEV.
YES
LED
NO
Replace the board in trouble.
Completed
HWE09070
- 94 -
GB
[ VIII Troubleshooting ]
(2) Solenoid valve (SVM1, 21S4a)
Faulty judgment of solenoid valve
Stop the operation of the applied
BC remote controller system.
NO
Stop the operation
YES
Check whether the wire to the
solenoid valve is not connected
wrongly, or the connector is not loose.
NO
No fault
Repair the fault.
YES
Run the cooling or heating operation
of the refrigerant system of the
solenoid valve in trouble.
Note 1
Check the operation sound of the solenoid
valves that are supposed to turn on.
NO
Makes a tick sound.
YES
Remove the solenoid valve coil, and
check that there is a suction force.
NO
There is a suction force.
YES
Note 2
Note 2
Measure the temperature at the upstream
and downstream pipes of the solenoid
valve, and compare them.
There is no temperature difference. : OK
There is a temperature difference. : NO
Check the relay output with the
self-diagnosis LED, and check
whether the operation corresponds
with the operation mode.
Stop the unit with the remote controller.
Remove the solenoid valve connector, and
check that the electricity runs through the
solenoid valve coil.
NO
OK
The electricity runs.
YES
YES
YES
Replace the control board.
Corresponds
NO
Note 2
Turn on the remote controller with the
connector of the solenoid valve in trouble
disconnected, and check that the control
board outputs 200V.
Measure the temperature at the upstream
and downstream pipes of the solenoid valve.
When the solenoid valve is ON : There is no temperature difference.
When the solenoid valve is OFF : There is a temperature difference.
Output 200V
YES
NO
Replace the control board.
OK
Replace the solenoid valve coil.
YES
Faulty judgment of solenoid valve
HWE09070
Solenoid valve failure
- 95 -
GB
[ VIII Troubleshooting ]
Check whether the BC board output signal corresponds with the solenoid valve operation correspond.
1) SVM1
SVM1 turns on or off according to the operation mode.
Operation
mode
Cooling only
Cooling main
Heating only
Heating main
Defrost
Stopped
ON
Differential
temperature
control OFF or
ON
OFF
OFF
ON
OFF
SVM1
2) 21S4a operation control
21S4a turns on or off according to the operation mode.
Operation
mode
Cooling only
Cooling main
Heating only
Heating main
Defrost
Stopped
21S4a
OFF
OFF
ON
OFF
The status before defrosting
maintained
OFF
3. WCB transformer
CNTR
Red
WCB control board
CN03
White
Red
Normal
CNTR(1)-(3)
about 58 ohm.
CN03(1)-(3)
about 1.6 ohm.
Red
Abnormal
Open-phase or shorting
* Before measuring the resistance, pull out the connector.
HWE09070
- 96 -
GB
[ VIII Troubleshooting ]
[4] Servicing the WCB
1. Service panel
*Special care must be taken when replacing heavy parts.
Work procedure
Explanatory figure
1) Remove the two lock nuts on the control box, loosen the
other two, and remove the control box.
2) Remove the three fixing screws on the service panel,
and remove the service panel.
3) Remove the nine machine screws on the ceiling panel,
and remove the ceiling panel.
Ceiling panel
Service panel
Loosen
Control Box
2. Control box
Work procedure
Explanatory figure
(1) To check the inside of the control box, remove the
two lock nuts on the control box cover.
1) Check the terminal connection of the power wire or of
the transmission line.
2) Check the transformer.
3) Check the address switch.
(2) When the control board is replaced, the followings
must be noted.
(1) Check that the board is for use with WCB.
(2) Check that the wire and the connector are properly connected.
It is not required to remove the two fixing screws on the
control box when checking the inside.
3. Thermistor (liquid pipe/gas pipe temperature detection)
*Special care must be taken when replacing heavy parts.
Work procedure
Explanatory figure
(1) Remove the service panel.
1) Check TH15 according to the procedure in section 1. 1),
2).
2) Check TH11, TH12, TH13, TH14, and TH16 according
to the procedure in section 1. 1), 2), 3).
(2) Remove the lead wire of the piping sensor from the
control board.
1) TH11,TH12,TH13, TH14 (CN10)
2) TH15,TH16 (CN11)
(3) Pull out the temperature sensor from the temperature sensor housing, and replace the temperature
sensor with the new one.
(4) Connect the lead wire of the temperature sensor securely on the control board.
HWE09070
- 97 -
TH14
TH16
TH11
TH13
TH12
TH15
GB
[ VIII Troubleshooting ]
4. LEV
Work procedure
Explanatory figure
(1) Remove the service panel. (See figure at right.)
(2) Replace the LEV in trouble.
Secure enough service space in the ceiling for welding
operation, and conduct the work carefully.If required,
dismount the unit from the ceiling, and conduct the work.
LEV3
LEV1
5. Solenoid valve, 4-way valve
*Special care must be taken when replacing heavy parts.
Work procedure
Explanatory figure
(1) Remove the service panel. (See figure at right.)
(2) Remove the connector of the solenoid valve in trouble.
(3) Remove the solenoid valve coil.
1) The coils on the solenoid valves SVM1 and on the 4-way
valve 21S4a can be serviced through the inspection
door.
21S4a
HWE09070
- 98 -
GB
IX LED Monitor Display on the Outdoor Unit Board
[1] How to Read the LED on the Service Monitor ............................................................... 101
HWE09070
- 99 -
GB
- 100 -
[ IX LED Monitor Display on the Outdoor Unit Board ]
[1] How to Read the LED on the Service Monitor
IX LED Monitor Display on the Outdoor Unit Board
1. How to read the LED
By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be
monitored on the service monitor. (Refer to the table on the following pages for DIP SW settings.)
The service monitor uses 4-digit 7-segment LED to display numerical values and other types of information.
7SEG LED
SW1
1
2
3
4
5
6
7
8
9 10
ON
SW1-10 is represented as “0” in the table.
Pressure and temperature are examples of numerical values, and operating conditions and the on-off status of solenoid valve
are examples of flag display.
1) Display of numerical values
Example: When the pressure data sensor reads 18.8kg/cm2 (Item No. 58)
ŒThe unit of pressure is in kg/cm2
ΠUse the following conversion formula to convert the displayed value into
a value in SI unit.
Value in SI unit (MPa) = Displayed value (kg/cm2) x 0.098
2) Flag display
Example: When 21S4a, 21S4b, SV1a are ON. (Item No. 3)
Upper
Lower
LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8
Example: 3-minutes restart mode (Item No. 14)
LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8
2. LED display at initial setting
From power on until the completion of initial settings, the following information will be displayed on the monitor screen.
(Displays No. 1 through No. 4 in order repeatedly.)
No
Item
Display
Remarks
Software version
1
[0103] : Version 1.03
Refrigerant type
2
[ 410] : R410A
Model and capacity
[H-20] : Cooling/Heating 20 HP
For the first few minutes after power on, the capacity of
each outdoor unit is displayed. Thereafter, the combined capacity is displayed.
3
Communication address
4
[ 51] : Address 51
After the initial settings have been completed, the information on these items can be checked by making the switch setting
that corresponds to No. 517 in the LED display table.
Only item No. 1 "Software Version" appears on the display if there is a wiring failure between the control board and the transmission line power supply board or if the circuit board has failed.
HWE09070
- 101 -
GB
HWE09070
- 102 -
0111000000
1010010000
0010000100
1010100100
0110100100
1110100100
0001100100
1101100100
0011100100
0111100100
1111100100
0000010100
1101010100
0011010100
14
37
132
149
150
151
152
155
156
158
159
160
171
172
LD5
21S4a
Mixed-mode
ON
Preliminary
error
BC TH14
BC TH13
BC LEV3
BC LEV1
-99.9 to 999.9
-99.9 to 999.9
0000 to 2000
0000 to 2000
-99.9 to 999.9
-99.9 to 999.9
-99.9 to 999.9
-99.9 to 999.9
-99.9 to 999.9
SVM2b
Heating-only
OFF
Compressor
in operation
BC SC16
SVM1b
Heating-only
ON
3-minutes
restart mode
-99.9 to 999.9
SVM2
LD4
LD6
Mixed-mode
OFF
Error
0000 to 9999 (Address and error codes highlighted)
LD3
BC SH12
SVM1
Cooling-only
OFF
LD2
-99.9 to 999.9
Bottom
Top
Cooling-only
ON
BC operation signal
LD1
BC SC14
BC TH16
BC TH15
BC TH12
BC TH11
Relay output display
BC(Main)
BC operation mode
Outdoor unit operation
status
Check (error) display 3
(Including IC and BC)
Item
Display
*1 A: The condition of either OC or OS is displayed individually. B: The condition of the entire refrigerant system is displayed.
0100000000
1234567890
SW1
2
No.
Current data
LED monitor display
IXLED monitor display on the outdoor unit board
Fan
3-minutes
restart after
instantaneous power
failure
LD7
Stop
Preliminary
low pressure error
LD8
B
B
B
B
B
B
B
B
B
B
B
B
B
A
B
OC
A
OS
Unit
(A, B) *1
LEV3 opening
(Fully open:2000)
LEV1 opening
(Fully open:2000)
If no errors are detected,
"----" appears on the display.
Remarks
[ IX LED monitor display on the outdoor unit board ]
HWE09070
1101001100
203
BC operation mode
Outdoor unit operation
status
Item
Cooling-only
ON
BC operation signal
LD1
Cooling-only
OFF
LD2
Heating-only
ON
3-minutes
restart mode
LD3
Heating-only
OFF
Compressor
in operation
LD4
LD5
Mixed-mode
ON
Preliminary
error
Display
*1 A: The condition of either OC or OS is displayed individually. B: The condition of the entire refrigerant system is displayed.
1001001100
1234567890
SW1
201
No.
Data before error
Mixed-mode
OFF
Error
LD6
Fan
3-minutes
restart after
instantaneous power
failure
LD7
Stop
Preliminary
low pressure error
LD8
A
A
OC
A
A
OS
Unit
(A, B) *1
Remarks
[ IX LED monitor display on the outdoor unit board ]
- 103 -
HWE09070
BC TH14
BC TH13
BC LEV3
BC LEV1
BC TH16
BC TH15
BC TH12
BC TH11
Item
LD1
LD2
LD3
LD5
-99.9 to 999.9
-99.9 to 999.9
0000 to 2000
0000 to 2000
-99.9 to 999.9
-99.9 to 999.9
-99.9 to 999.9
-99.9 to 999.9
LD4
Display
*1 A: The condition of either OC or OS is displayed individually. B: The condition of the entire refrigerant system is displayed.
1110101010
343
0101001010
330
1101001010
1100001010
323
0110101010
0100001010
322
342
1000001010
321
331
0000001010
1234567890
SW1
320
No.
Current data
LD6
LD7
LD8
B
B
B
B
B
B
B
B
OC
OS
Unit
(A, B)*1
Remarks
[ IX LED monitor display on the outdoor unit board ]
- 104 -
Service Handbook CMB-PW202V-J
Issued in Sep. 2009 HWE09070
Printed in Japan
New publication effective Sep. 2009.
Specifications subject to change without notice.