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Safety Precautions
Before installing the unit, thoroughly read the following safety precautions.
Observe these safety precautions for your safety.
WARNING
This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid
the risk of serious injury or death.
CAUTION
This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid
the risk of serious injury or damage to the unit.
After reading this manual, give it to the user to retain for future reference.
Keep this manual for easy reference. When the unit is moved or repaired, give this manual to those who provide these
services.
When the user changes, make sure that the new user receives this manual.
WARNING
Ask your dealer or a qualified technician to install the
unit.
Improper installation by the user may result in water leakage, electric shock, smoke, and/or fire.
Properly install the unit on a surface that can withstand the weight of the unit.
Unit installed on an unstable surface may fall and cause injury.
Only use specified cables. Securely connect each cable so that the terminals do not carry the weight of the
cable.
Improperly connected or fixed cables may produce heat
and start a fire.
Take appropriate safety measures against strong
winds and earthquakes to prevent the unit from falling.
If the unit is not installed properly, the unit may fall and
cause serious injury to the person or damage to the unit.
Do not make any modifications or alterations to the
unit. Consult your dealer for repair.
Improper repair may result in water leakage, electric shock,
smoke, and/or fire.
In the event of a refrigerant leak, thoroughly ventilate
the room.
If refrigerant gas leaks and comes in contact with an open
flame, poisonous gases will be produced.
Properly install the unit according to the instructions
in the installation manual.
Improper installation may result in water leakage, electric
shock, smoke, and/or fire.
Have all electrical work performed by an authorized
electrician according to the local regulations and instructions in this manual, and a dedicated circuit must
be used.
Insufficient capacity of the power supply circuit or improper
installation may result in malfunctions of the unit, electric
shock, smoke, and/or fire.
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.
If the terminal block cover (panel) is not installed properly,
dust and/or water may infiltrate and pose a risk of electric
shock, smoke, and/or fire.
Only use the type of refrigerant that is indicated on the
unit when installing or reinstalling the unit.
Infiltration of any other type of refrigerant or air into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.
When installing the unit in a small room, exercise caution and take measures against leaked refrigerant
reaching the limiting concentration.
Consult your dealer with any questions regarding limiting
concentrations and for precautionary measures before installing the unit. Leaked refrigerant gas exceeding the limiting concentration causes oxygen deficiency.
Consult your dealer or a specialist when moving or reinstalling the unit.
Improper installation may result in water leakage, electric
shock, and/or fire.
After completing the service work, check for a gas
leak.
If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, poisonous gases may be
produced.
Do not try to defeat the safety features of the unit.
Forced operation of the pressure switch or the temperature
switch by defeating the safety features of these devices, or
the use of accessories other than the ones that are recommended by MITSUBISHI may result in smoke, fire, and/or
explosion.
Only use accessories recommended by MITSUBISHI.
Ask a qualified technician to install the unit. Improper installation by the user may result in water leakage, electric
shock, smoke, and/or fire.
Control box houses high-voltage parts.
When opening or closing the front panel of the control box,
do not let it come into contact with any of the internal components. Before inspecting the inside of the control box,
turn off the power, keep the unit off for at least 10 minutes,
and confirm that the voltage between FT-P and FT-N on
INV Board has dropped to DC20V or less. (It takes about
10 minutes to discharge electricity after the power supply is
turned off.)
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Precautions for handling units for use with R410A
CAUTION
Do not use the existing refrigerant piping.
A large amount of chlorine that may be contained in the re-
sidual refrigerant and refrigerating machine oil in the existing piping may cause the refrigerating machine oil in the
new unit to deteriorate.
R410A is a high-pressure refrigerant and can cause the
existing pipes to burst.
Use refrigerant pipes made of phosphorus deoxidized
copper. Keep the inner and outer surfaces of the pipes
clean and free of such contaminants as sulfur, oxides,
dust, dirt, shaving particles, oil, and water.
These types of contaminants inside the refrigerant pipes
may cause the refrigerant oil to deteriorate.
Store the pipes to be installed indoors, and keep both
ends of the pipes sealed until immediately before brazing. (Keep elbows and other joints wrapped in plastic.)
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate or
cause the unit to malfunction.
Use a small amount of ester oil, ether oil, or alkylbenzene to coat flares and flanges.
Infiltration of a large amount of mineral oil may cause the refrigerating machine oil to deteriorate.
Charge liquid refrigerant (as opposed to gaseous refrigerant) into the system.
If gaseous refrigerant is charged into the system, the composition of the refrigerant in the cylinder will change and
may result in performance loss.
Use a vacuum pump with a reverse-flow check valve.
If a vacuum pump that is not equipped with a reverse-flow
check valve is used, the vacuum pump oil may flow into the
refrigerant cycle and cause the refrigerating machine oil to
deteriorate.
Prepare tools for exclusive use with R410A. Do not use
the following tools if they have been used with the conventional refrigerant (gauge manifold, charging hose,
gas leak detector, reverse-flow check valve, refrigerant
charge base, vacuum gauge, and refrigerant recovery
equipment.).
If the refrigerant or the refrigerating machine oil left on
these tools are mixed in with R410A, it may cause the refrigerating machine oil to deteriorate.
Infiltration of water may cause the refrigerating machine
oil to deteriorate.
Gas leak detectors for conventional refrigerants will not
detect an R410A leak because R410A is free of chlorine.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of the refrigerant will change, and the unit may experience power loss.
Exercise special care when handling the tools for use
with R410A.
Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate.
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.
If gaseous refrigerant leaks and piles up around the unit, it
may be ignited.
Do not use the unit to keep food items, animals, plants,
artifacts, or for other special purposes.
The unit is not designed to preserve food products.
Do not use the unit in an unusual environment.
Do not install the unit where a large amount of oil or steam
is present or where acidic or alkaline solutions or chemical
sprays are used frequently. Doing so may lead to a remarkable drop in performance, electric shock, malfunctions, smoke, and/or fire.
The presence of organic solvents or corrosive gas (i.e.
ammonia, sulfur compounds, and acid) may cause gas
leakage or water leakage.
When installing the unit in a hospital, take appropriate
measures to reduce noise interference.
High-frequency medical equipment may interfere with the
normal operation of the air conditioner or vice versa.
Do not install the unit on or over things that cannot get
wet.
When the humidity level exceeds 80% or if the drainage
system is clogged, the indoor unit may drip water. Drain water is also discharged from the outdoor unit. Install a centralized drainage system if necessary.
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Before installing the unit (moving and reinstalling the unit) and performing
electrical work
CAUTION
Properly ground the unit.
Do not connect the grounding wire to a gas pipe, water pipe,
lightning rod, or grounding wire from a telephone pole. Improper grounding may result in electric shock, smoke, fire,
and/or malfunction due to noise interference.
Do not put tension on the power supply wires.
If tension is put on the wires, they may break and result in
excessive heat, smoke, and/or fire.
Install an earth leakage breaker to avoid the risk of
electric shock.
Failure to install an earth leakage breaker may result in
electric shock, smoke, and/or fire.
Use the kind of power supply wires that are specified
in the installation manual.
The use of wrong kind of power supply wires may result in
current leak, electric shock, and/or fire.
Use breakers and fuses (current breaker, remote
switch <switch + Type-B fuse>, moulded case circuit
breaker) with the proper current capacity.
The use of wrong capacity fuses, steel wires, or copper
wires may result in malfunctions, smoke, and/or fire.
Periodically check the installation base for damage.
If the unit is left on a damaged platform, it may fall and
cause injury.
Properly install the drain pipes according to the instructions in the installation manual. Keep them insulated to avoid dew condensation.
Improper plumbing work may result in water leakage and
damage to the furnishings.
Exercise caution when transporting products.
Products weighing more than 20 kg should not be carried
alone.
Do not carry the product by the PP bands that are used on
some products.
Do not touch the heat exchanger fins. They are sharp and
dangerous.
When lifting the unit with a crane, secure all four corners
to prevent the unit from falling.
Properly dispose of the packing materials.
Nails and wood pieces in the package may pose a risk of
injury.
Plastic bags may pose a risk of choking hazard to chil-
dren. Tear plastic bags into pieces before disposing of
them.
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.
Keep the unit turned on throughout the season. If the unit is
turned off in the middle of a season, it may result in malfunctions.
To avoid the risk of electric shock or malfunction of the
unit, do not operate switches with wet hands.
Do not touch the refrigerant pipes with bare hands during and immediately after operation.
During or immediately after operation, certain parts of the
unit such as pipes and compressor may be either very cold
or hot, depending on the state of the refrigerant in the unit
at the time. To reduce the risk of frost bites and burns, do
not touch these parts with bare hands.
Do not operate the unit without panels and safety
guards.
Rotating, high-temperature, or high-voltage parts on the unit
pose a risk of burns and/or electric shock.
Do not turn off the power immediately after stopping
the operation.
Keep the unit on for at least five minutes before turning off
the power to prevent water leakage or malfunction.
Do not operate the unit without the air filter.
Dust particles may build up in the system and cause malfunctions.
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CONTENTS
I
II
III
IV
V
VI
VII
VIII
IX
X
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 .............................................................................................................. 11
[10] Remedies to be taken in case of a Refrigerant Leak............................................................ 11
[11] Characteristics of the Conventional and the New Refrigerants ............................................ 12
[12] Notes on Refrigerating Machine Oil ...................................................................................... 13
Restrictions
[1] System configuration .............................................................................................................. 17
[2] Types and Maximum allowable Length of Cables .................................................................. 18
[3] Switch Settings and Address Settings .................................................................................... 20
[4] An Example of a System to which an MA Remote Controller is connected ........................... 24
[5] Restrictions on Pipe Length.................................................................................................... 32
Outdoor Unit Components
[1] Outdoor Unit Components and Refrigerant Circuit ................................................................. 35
[2] Control Box of the Outdoor Unit.............................................................................................. 37
[3] Outdoor Unit Circuit Board...................................................................................................... 38
Indoor Unit Components
[1] External Dimensions............................................................................................................... 45
[2] Indoor Unit Components and Internal Structure ..................................................................... 47
[3] Control Box of the Indoor Unit ................................................................................................ 51
[4] Indoor Unit Circuit Board ........................................................................................................ 52
[5] Separating the top and bottom of the unit............................................................................... 53
Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the Outdoor Unit ........................................................................ 59
[2] Electrical Wiring Diagram of the Indoor Unit........................................................................... 60
Refrigerant Circuit
[1] Refrigerant Circuit Diagram .................................................................................................... 65
[2] Principal Parts and Functions ................................................................................................. 67
Control
[1] Functions and Factory Settings of the Dipswitches ................................................................ 73
[2] Controlling the Outdoor Unit ................................................................................................... 78
[3] Controlling the Indoor Unit ...................................................................................................... 89
[4] Operation Flow Chart.............................................................................................................. 93
Test Run Mode
[1] Items to be checked before a Test Run .................................................................................. 99
[2] Test Run Method .................................................................................................................. 100
[3] Operating Characteristic and Refrigerant Amount................................................................ 101
[4] Adjusting the Refrigerant Amount......................................................................................... 101
[5] Refrigerant Amount Adjust Mode.......................................................................................... 103
[6] The following symptoms are normal. .................................................................................... 105
[7] Standard Operation Data (Reference Data) ......................................................................... 106
Troubleshooting
[1] Error Code Lists.................................................................................................................... 109
[2] Responding to Error Display on the Remote Controller........................................................ 112
[3] Investigation of Transmission Wave Shape/Noise ............................................................... 160
[4] Troubleshooting Principal Parts............................................................................................ 163
[5] Refrigerant Leak ................................................................................................................... 182
[6] Compressor Replacement Instructions................................................................................. 183
[7] Troubleshooting Using the Outdoor Unit LED Error Display................................................. 185
[8] Maintenance/Inspection Schedule........................................................................................ 186
LED Monitor Display on the Outdoor Unit Board
[1] How to Read the LED on the Service Monitor ...................................................................... 191
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I
Read Before Servicing
[1] Read Before Servicing ....................................................................................................... 3
[2] Necessary Tools and Materials.......................................................................................... 4
[3] Piping Materials .................................................................................................................5
[4] Storage of Piping ............................................................................................................... 7
[5] Pipe Processing................................................................................................................. 7
[6] Brazing............................................................................................................................... 8
[7] Air Tightness Test.............................................................................................................. 9
[8] Vacuum Drying (Evacuation) ........................................................................................... 10
[9] Refrigerant Charging........................................................................................................ 11
[10] Remedies to be taken in case of a Refrigerant Leak .......................................................11
[11] Characteristics of the Conventional and the New Refrigerants .......................................12
[12] Notes on Refrigerating Machine Oil ................................................................................. 13
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[ I Read Before Servicing ]
IRead Be fore Servicing
[1] Read Before Servicing
1. Check the type of refrigerant used in the system to be serviced.
Refrigerant Type
New refrigerant series split-type air-conditioners for computer rooms R410A
2. Check the symptoms exhibited by the unit to be serviced.
Refer to this service handbook for symptoms relating to the refrigerant cycle.
3. Thoroughly read the safety precautions at the beginning of this manual.
4. Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant.
Refer to "Necessary Tools and Materials" for information on the use of tools.(page 4)
5. Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be moved or replaced.
Use refrigerant pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free
of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and water.
These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate.
6. If there is a leak of gaseous refrigerant and the remaining refrigerant is exposed to an open flame, a poisonous gas
hydrofluoric acid may form. Keep workplace well ventilated.
CAUTION
Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
The use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.
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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 Connection of the unit with the pipes Use Type-2 Flare nuts.
2. Tools and materials that may be used with R410A with some restrictions
Tools/Materials Use Notes
Gas Leak Detector Gas leak detection The ones for use with HFC refrigerant
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 next page.
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 Notes
Vacuum Pump with a Check Valve Vacuum drying
Bender Bending pipes
Torque Wrench Tightening flare nuts Only the flare processing dimensions
for pipes that have a diameter of
ø12.70 (1/2") and ø15.88 (5/8") have
been changed.
Pipe Cutter Cutting pipes
Welder and Nitrogen Cylinder Welding pipes
Refrigerant Charging Meter Refrigerant charging
Vacuum Gauge Vacuum level check
4. Tools and materials that must not be used with R410A
Tools/Materials Use Notes
Charging Cylinder Refrigerant charging 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.
The distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes them-
selves.
O-materials (Annealed) can easily be bent with hands.
1/2H-materials (Drawn) are considerably stronger than O-material (Annealed) at the same thickness.
2. Types of copper pipes
Maximum working pressure Refrigerant type
3.45 MPa [500psi] R22, R407C etc.
4.30 MPa [624psi] R410A etc.
3. Piping materials/Radial thickness
Use refrigerant pipes made of phosphorus deoxidized copper.
The operation pressure of the units that use R410A is higher than that of the units that use R22.
Use pipes that have at least the radial thickness specified in the chart below.
(Pipes with a radial thickness of 0.7 mm or less may not be used.)
Pipe size (mm[in]) Radial thickness (mm) Type
ø6.35 [1/4"] 0.8t
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
The pipes in the system that uses the refrigerant currently on the market are made with O-material (Annealed), even if the
pipe diameter is less than ø19.05 (3/4"). For a system that uses R410A, use pipes that are made with 1/2H-material (Drawn)
unless the pipe diameter is at least ø19.05 (3/4") and the radial thickness is at least 1.2t.
The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.
O-material (Annealed)
1/2H-material,
H-material (Drawn)
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[ 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)
Pipe size (mm[in])
R410A R22, R407C
ø6.35 [1/4"] 9.1 9.0
ø9.52 [3/8"] 13.2 13.0
ø12.7 [1/2"] 16.6 16.2
Dimension A
ø15.88 [5/8"] 19.7 19.4
ø19.05 [3/4"] 24.0 23.3
If a clutch-type flare tool is used to flare the pipes in the system using R410A, the length of the pipes must be between 1.0
and 1.5 mm. For margin adjustment, a copper pipe gauge is necessary.
6. Flare nut
The flare nut type has been changed to increase the strength. The size of some of the flare nuts have also been changed.
Flare nut dimensions (mm[in])
B dimension (mm)
Pipe size (mm[in])
R410A R22, R407C
ø6.35 [1/4"] 17.0 17.0
ø9.52 [3/8"] 22.0 22.0
ø12.7 [1/2"] 26.0 24.0
Dimension B
ø15.88 [5/8"] 29.0 27.0
ø19.05 [3/4"] 36.0 36.0
The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.
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[ 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.
Use a minimum amount of oil.
Use 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
Do not conduct refrigerant piping work outdoors if raining.
Use non-oxidized solder.
Use a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and
copper coupling.
If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends.
2. Reasons
The new refrigerating machine oil is 10 times as hygroscopic as the conventional oil and is more likely to cause unit failure if
water infiltrates into the system.
Flux generally contains chloride. Residual flux in the refrigerant circuit will cause sludge to form.
3. Notes
Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.
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[ 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
Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight-
ness, taking temperature variations into account.
When using refrigerant instead of a leak detector to find the location of a leak, use R410A.
Refrigerant R410A must be charged in its liquid state (vs. gaseous state).
2. Reasons
Oxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
Refrigerant R410A must be charged in its liquid state. If gaseous refrigerant in the cylinder is drawn out first, the composition
of the remaining refrigerant in the cylinder will change and become unsuitable for use.
3. Notes
Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an
HFC(R410A) leak.
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[ 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
After the degree of vacuum has reached 5Torr(650Pa), evacuate for an additional 1 hour. (A thorough vacuum drying re-
moves moisture in the pipes.)
Verify that the vacuum degree has not risen by more than 1Torr(130Pa) 1hour after evacuation. A rise by less than
1Torr(130Pa) is acceptable.
If the vacuum is lost by more than 1Torr(130Pa), conduct evacuation, following the instructions in section 6. Special vacuum
drying.
5. Procedures for stopping vacuum pump
To prevent the reverse flow of vacuum pump oil, open the relief valve on the vacuum pump side, or draw in air by loosening
the charge hose, and then stop the operation.
The same procedures should be followed when stopping a vacuum pump with a reverse-flow check valve.
6. Special vacuum drying
When 5Torr(650Pa) or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has pen-
etrated the system or that there is a leak.
If water infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to
0.5kgf/cm
2
G(0.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree of vac-
uum below 5Torr(650Pa) is attained or until the pressure stops rising.
Only use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)
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[ I Read Before Servicing ]
[9] Refrigerant Charging
Cylinder with a siphon
Cylinder without a siphon
Cylin-
Cylin-
der
der
Cylinder color R410A is pink. Refrigerant charging in the liquid state
Valve Valve
liquid
liquid
1. 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 "IX [5] Refrigerant Leak".(page 182)
HWE07190 GB
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Page 21
[ 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 Refriger-
ant (HCFC type)
R410A R407C R22
R32/R125 R32/R125/R134a R22
Composition (wt%) (50/50) (23/25/52) (100)
Type of Refrigerant Pseudo-azeotropic
Refrigerant
Non-azeotropic
Refrigerant
Single Refrigerant
Chloride Not included Not included Included
Safety Class A1/A1 A1/A1 A1
Molecular Weight 72.6 86.2 86.5
Boiling Point (°C/°F) -51.4/-60.5 -43.6/-46.4 -40.8/-41.4
Steam Pressure
1.557/226 0.9177/133 0.94/136
(25°C,MPa/77°F,psi) (gauge)
Saturated Steam Density
(25°C,kg/m
3
/77°F,psi)
64.0 42.5 44.4
Flammability Nonflammable Nonflammable Nonflammable
Ozone Depletion Coefficient (ODP)
Global Warming Coefficient (GWP)
Refrigerant Charging Method Refrigerant charging i n
Replenishment of Refrigerant after a Refrigerant
*1
*2
0 0 0.055
1730 1530 1700
the liquid state
Refrigerant charging in
the liquid state
Refrigerant charging in
the gaseous state
Available Available Available
Leak
*1 When CFC11 is used as a reference
*2 When CO
is used as a reference
2
2. Refrigerant composition
R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To
be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn
out, the composition of the remaining refrigerant will change and become unsuitable for use.
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced.
3. Pressure characteristics
The pressure in the system using R410A is 1.6 times as great as that in the system using R22.
Pressure (gauge)
Temperature (°C/°F)
R410A R407C R22
MPa/psi MPa/psi MPa/psi
-20/-4 0.30/44 0.18/26 0.14/20
0/32 0.70/102 0.47/68 0.40/58
20/68 1.34/194 0.94/136 0.81/117
40/104 2.31/335 1.44/209 1.44/209
60/140 3.73/541 2.44/354 2.33/338
65/149 4.17/605 2.75/399 2.60/377
HWE07190 GB
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[ 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 Effects on the refrigerant cycle
Water infiltration Frozen expansion valve
and capillary tubes
Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Motor insulation failure
Burnt motor
Coppering of the orbiting scroll
Lock
Burn-in on the orbiting scroll
Hydrolysis
Sludge formation and adhesion
Acid generation
Oxidization
Oil degradation
Air infiltration Oxidization
Adhesion to expansion valve and capillary
tubes
Clogged expansion valve, capillary tubes, and
drier
Poor cooling performance
Infiltration of
contaminants
Dust, dirt
Infiltration of contaminants into the compressor
Compressor overheat
Burn-in on the orbiting scroll
Sludge formation and adhesion Clogged expansion valve and capillary tubes
Mineral oil
etc.
Poor cooling performance
Compressor overheat
Oil degradation Burn-in on the orbiting scroll
*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.
HWE07190 GB
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Page 23
- 14 -
Page 24
II
Restrictions
[1] System configuration ....................................................................................................... 17
[2] Types and Maximum allowable Length of Cables ...........................................................18
[3] Switch Settings and Address Settings ............................................................................. 20
[4] An Example of a System to which an MA Remote Controller is connected..................... 24
[5] Restrictions on Pipe Length ............................................................................................. 32
HWE07190 GB
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Page 25
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Page 26
[ II Restrictions ]
IIRestrictions
[1] System configuration
Indoor unit model Outdoor unit model
PFD-P250VM-E PUHY-P250YHM-A
PFD-P500VM-E PUHY-P250YHM-A x 2 *1
*1 When two outdoor units are connected to one indoor unit, two refrigerant circuits must be connected.
Only one refrigerant circuit can be connected to the indoor unit at factory shipment. To connect two refrigerant circuits, perform some work on the unit.
1. Restrictions when the PFD-type indoor units are connected (related to the system)
(1) The PFD-type indoor units cannot be connected to the ME remote controller.
(2) The address settings must be made on this system.
(3) The following functions cannot be selected on the PFD-type indoor units.
1) Switching between automatic power recovery Enabled/Disabled (Fixed to "Enabled" in the PFD-type indoor units)
2) Switching between power source start/stop (Fixed to "Disabled" in the PFD-type indoor units)
(4) The PFD-type indoor units and other types of indoor units cannot be grouped.
(5) The following functions are limited when the system controller (such as G-50A) is connected.
1) To perform group operation in the system with two refrigerant circuits (combination of two outdoor units and one indoor unit:
P500 model only), the addresses of the controller boards No.1 and No.2 on a indoor unit must be set within a group.
2) The local operation cannot be prohibited with the main remote controller.
3) When the switches of the PFD-type indoor units are set as follows, the unit ON/OFF operation cannot be made with the main
remote controller.
When the Normal/Local switching switch is set to "Local"
When the DipSW1-10 on the controller circuit board is set to "ON"
HWE07190 GB
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Page 27
[ II Restrictions ]
[2] Types and Maximum allowable Length of Cables
1. Wiring work
(1) Notes
1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this manual.
2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference.
(Do not put the control cable and power supply cable in the same conduit tube.)
3) Provide grounding for the outdoor unit as required.
4) Run the cable from the electric box of the indoor or outdoor unit in such way that the box is accessible for servicing.
5) Do not connect power supply wiring to the terminal block for transmission line. Doing so will damage the electronic components on the terminal block.
6) Use 2-core shielded cables as transmission cables.
Use a separate 2-core control cable for each refrigerant system. Do not use a single multiple-core cable to connect indoor
units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and
malfunctions.
TB7
TB7
Outdoor unit
Indoor unit
multiple-core cable
Indoor unit
TB3
TB3
Outdoor unit
TB7
TB7
2-core shielded cable
Outdoor unit
2-core shielded cable
Indoor unit
Indoor unit
TB3
TB3
TB3:Terminal block for transmission line connection
TB7:Terminal block for transmission line for centralized control
(2) Control wiring
Different types of control wiring are used for different systems.
Refer to section "[4] An Example of a System to which an MA Remote Controller is connected" before performing wiring work.
Types and maximum allowable length of cables
Control lines are categorized into 2 types: transmission line and remote controller line.
Use the appropriate type of cables and observe the maximum allowable length specified for a given system. If a given system
has a long transmission line or if a noise source is located near the unit, place the unit away from the noise source to reduce
noise interference.
1) M-NET transmission line
Facility
type
All facility types
Type Shielded cable CVVS, CPEVS, MVVS
Cable type
Number of
cores
Cable size Larger than 1.25mm
2-core cable
2
[AWG16]
Maximum transmission
line distance between the
outdoor unit and the far-
200m [656ft] max.
thest indoor unit
Maximum transmission
line distance for centralized control and Indoor/
outdoor transmission line
(Maximum line distance
500m [1640ft] max.
*The maximum overall line length from the power supply unit on the transmission lines for
centralized control to each outdoor unit or to the system controller is 200m [656ft] max.
via outdoor unit)
HWE07190 GB
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Page 28
[ II Restrictions ]
2) Remote controller wiring
Type CVV
Number of
Cable type
cores
Cable size
Maximum overall line
length
MA remote controller
2-core cable
0.3 to 1.25mm
2 *1
[AWG22 to 16]
200m [656ft] max.
*1 The use of cables that are smaller than 0.75mm
2
[AWG18] is recommended for easy handling.
HWE07190 GB
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Page 29
[ II Restrictions ]
[3] Switch Settings and Address Settings
1. Switch setting
Refer to section "[4] 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.
2. Address settings
(1) Address settings table
The need for address settings and the range of address setting depend on the configuration of the system. Refer to section
"II [4] An Example of a System to which an MA Remote Controller is connected"
Unit or controller Symbols Address setting
range
Setting method Ad-
dress
setting
Indoor
unit
Main/sub
unit
MA remote
controller
IC 01 to 50
*1
MA No address settings required. (The main/sub switch must be configured if two
remote controllers are connected to the system or if the indoor units are con-
In case of 10HP system, assign an odd number starting with
"01". In case of 20HP system with two refrigerant circuits, assign a sequential odd number starting with "01" to the upper
indoor controller, and assign "the address of the upper indoor
controller + 1" to the lower indoor controller.
nected to different outdoor units.)
Outdoor unit OC 51 to 100
*1
Assign an address of the indoor units in the same refrigerant system and 50.
*1. If a given address overlaps any of the addresses that are assigned to indoor or outdoor units in other refrigerant systems,
use a different, unused address within the setting range.
(2) Power supply switch connector connection on the outdoor unit
(Factory setting: The male power supply switch connector is connected to CN41.)
System configuration
Connection to the
system controller
Power supply unit for
transmission lines
Group operation of
units in a system with
Power supply switch connector connection
multiple outdoor units
System with one
outdoor unit
System with multiple outdoor units
Not connected _ Not grouped
With connection to
the indoor-outdoor
transmission line
With connection to
the centralized control system
_ _ _ Leave CN41 as it is
(Factory setting)
Grouped Disconnect the male con-
Not required Grouped/not grouped
nector from the female
power supply switch connector (CN41) and connect it to the female power
Not required
(Powered from the
outdoor unit)
Grouped/not grouped
supply switch connector
(CN40) on only one of the
outdoor units.
*Connect the S (shielded)
terminal on the terminal
block (TB7) on the outdoor unit whose CN41
was replaced with CN40
to the ground terminal
( ) on the electric box.
Required Grouped/not grouped Leave CN41 as it is
(Factory setting)
00
Main
00
HWE07190 GB
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Page 30
[ II Restrictions ]
(3) Settings of MA remote controller Main/Sub switching switch (When MA remote controller is used: factory setting
"Main")
Main/sub settings are available on the MA remote controller. When two remote controllers are connected, set either of them
to "Sub".
(4) Selecting the position of temperature detection for the indoor unit (Factory setting: SWC "Standard")
To use a suction temperature sensor, set SWC to "Option". (The suction temperature sensor is supplied as standard specification.)
(5) Connection of two refrigerant circuits
When two refrigerant circuits are connected on site, make the switch settings on the controller circuit board following the instructions described in the installation manual for the indoor unit.
(6) Cooling-only setting for the indoor unit (Factory setting: SW3-1 on the indoor unit to "OFF.")
When using indoor unit as a cooling-only unit, set SW3-1 on the indoor unit to ON.
(7) Various types of control using input-output signal connector on the outdoor unit (various connection options)
Type Usage Function
Input Prohibiting cooling/heating operation (thermo OFF) by an external
DEMAND (level) CN3D
input to the outdoor unit.
*It can be used as the DEMAND control device for each refriger-
ant system.
Performs a low level noise operation of the outdoor unit by an external input to the outdoor unit.
Low-noise mode
*3*4
(level)
to be
used
*1
*2
Option
Adapter for
external input
(PACSC36NA-E)
Terminal
* It can be used as the silent operation device for each refrigerant
system.
Forces the outdoor unit to perform a fan operation by receiving signals from the snow sensor.
Out-
How to extract signals from the outdoor unit
put
*It can be used as an operation status display device.
*5
*It can be used for an interlock operation with external devices.
Snow sensor signal
input (level)
Operation status of
the compressor
Error status
CN3S
CN51 Adapter for
external output
(PACSC37SA-E)
*1. For detailed drawing, refer to "Example of wiring connection".
*2. For details, refer to 1) through 2) shown below.
*3. Low-noise mode is valid when Dip SW4-4 on the outdoor unit is set to OFF. When DIP SW4-4 is set to ON, 4 levels of
on-DEMAND are possible, using different configurations of low-noise mode input and DEMAND input settings.
*4. By setting Dip SW5-5, the Low-noise mode can be switched between the Capacity priority mode and the Low-noise pri-
ority mode.
When SW5-5 is set to ON: The Low-noise mode always remains effective.
When SW5-5 is set to OFF: The Low-noise mode is cancelled when certain outside temperature or pressure criteria are
met, and the unit goes into normal operation (capacity priority mode).
Low-noise mode is effective Capacity priority mode becomes effective
Cooling Heating Cooling Heating
TH7 < 30°C [86°F]
and
63HS1 < 32kg/cm
2
TH7 > 3°C [37°F]
and
63LS > 4.6kg/cm
TH7 > 35°C [95°F]
2
or
63HS1 > 35kg/cm
2
TH7 < 0°C [32°F]
or
63LS < 3.9kg/cm
2
*5. When multiple outdoor units exist in one refrigerant circuit system, settings on every outdoor unit (signal input) are re-
quired.
HWE07190 GB
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Page 31
[ II Restrictions ]
CAUTION
1) Wiring should be covered by insulation tube with supplementary insulation.
2) Use relays or switches with IEC or equivalent standard.
3) The electric strength between accessible parts and control circuit should have 2750V or more.
Example of wiring connection
CN51
Distant control
board
ecruosrewoppmaL
1
L
L
2
L1 : Outdoor unit error display lamp
L2 : Compressor operation lamp (compressor running state)
X, Y : Relay (coil =<0.9W : DC12V)
1. Optional part : PAC-SC37SA-E or field supply.
CN3D
Relay circuit
Preparations
in the field
X : Low-noise mode
Y : Compressor ON/OFF
X,Y : Relay
2. Optional part : PAC-SC36NA-E or field supply.
Relay circuit Adapter
X
Y
Y
X
Preparations
in the field
Adapter
X
Y
Maximum cable
length is 10m
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum appicable load =< 1mA at DC
2
1
2
3
Maximum cable
length is 10m
Outdoor unit
control board
CN3D
1
5
4
3
Outdoor unit
control board
CN51
CN3S
Relay circuit
X
Preparations
in the field
X : Relay
Snow sensor : The outdoor fan runs when X is closed
2. Optional part : PAC-SC36NA-E or field supply.
Relay circuit
X
Preparations
in the field
X : Low-noise mode
X : Relay
2. Optional part : PAC-SC36NA-E or field supply.
Low-noise mode : The noise level is reduced by controlling the maximum
Adapter
Maximum cable
length is 10m
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
in stop mode or thermostat mode.
Adapter
Maximum cable
length is 10m
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
fan frequency and maximum compressor frequency.
1
2
3
1
2
3
Outdoor unit
2
control board
CN3S
Outdoor unit
2
control board
CN3D
1) SW4-4: OFF (Compressor ON/OFF, Low-noise mode)
CN3D 1-3P Compressor ON/OFF
Open Compressor ON
Short-circuit Compressor OFF
CN3D 1-2P Low-noise mode
*1
Open OFF
Short-circuit ON
*1. This function and the 4-level on-DEMAND function can be used together. Input the order to CN3D 1-2P on the outdoor
unit whose SW4-4 is set to OFF.
HWE07190 GB
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Page 32
[ II Restrictions ]
2) When SW4-4 on one outdoor unit in one refrigerant circuit system is set to ON (4 levels of on-DEMAND)
CN3D 1-2P
CN3D 1-3P Open Short-circuit
Open 100% (No DEMAND) 75%
Short-circuit 0% (Compressor OFF) 50%
*2. Input the order to CN3D on the outdoor unit whose SW4-4 is set to ON.
Note the following steps to be taken when using the STEP DEMAND
(Example) When switching from 100% to 50%
Demand control
steps
If the step listed as the wrong example above is taken, thermo may go off.
The percentage of the demand listed in the table above is an approximate value based on the
compressor volume and does not necessarily correspond with the capacity.
When this function is enabled, the night mode cannot be enabled.
(Wrong)
(Correct)
100%
100%
0%
75%
50%
50%
*2
HWE07190 GB
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Page 33
[ II Restrictions ]
[4] An Example of a System to which an MA Remote Controller is connected
1. System with one refrigerant
(1) Sample control wiring
Leave the male
connector on
CN41 as it is.
TB7
M1M2
51
S
OC
TB3
M1M2
L1
IC
01
TB5-1
A1B1S
TB15
1
AB
MA
2
*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).
02
TB5-2
A2 B2
S
(2) Notes
1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.
2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).
3) Although two indoor controllers (controller circuit boards)
are equipped inside the indoor unit, the board on No.2
side (lower side) is not used. Do not connect wiring to the
lower controller circuit board.
(3) Maximum allowable length
1) Indoor/outdoor transmission line
2
Maximum distance (1.25mm
[AWG16] or larger)
L1 200m [656ft]
- 24 -
GBHWE07190
Page 34
[ II Restrictions ]
(4) Wiring method
1) Indoor/outdoor transmission line
Connect M1, M2 terminals of the indoor/outdoor trans-
mission line terminal block (TB3) on the outdoor unit
(OC) and A1, B1 terminals of the indoor/outdoor terminal
block (TB5-1) on the indoor unit (IC). (Non-polarized 2core cable)
Only use shielded cables.
(5) Address setting method
Procedures Unit or controller
1 Indoor
Main unit IC 01 to 50 Assign a sequential odd number
unit
Sub unit IC 01 to 50 Assign sequential numbers start-
2 Outdoor unit OC 51 to 100 Add 50 to the address assigned
3MA
remote
controller
Main
remote
controller
Sub
MA No settings
MA Sub
remote
controller
Address
setting range
required.
remote
controller
Shielded cable connection
Connect the earth terminal of the OC and S terminal of
the IC terminal block (TB5-1).
2) Switch setting
Address setting is required as follows.
Setting method Notes
starting with "01" to the upper indoor controller.
ing with the address of the main
unit in the same group. (Main
unit address +1)
to the indoor unit connected to
the system with one outdoor unit.
- Main
Settings to be made with the sub/
main switch
Factory
setting
00
00
HWE07190 GB
25- 25 -
Page 35
[ II Restrictions ]
2. System with two refrigerant circuits
(1) Sample control wiring
CN40
CN41
Replace
TB7
M1M2
51
S
OC
TB3
M1M2
L1
IC
01
TB5-1
A1 B1
S
*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).
TB15
TB5-2
A2 B2
Not connect
L2
1
AB
MA
2
02
S
L31
Connect
Leave the male
connector on
CN41 as it is.
TB7
M1M2
52
S
OC
TB3
M1M2
(2) Notes
1) Assign the sequential number to the indoor units.
2) Do not connect the terminal blocks (TB5) on the indoor
unitsthat are connected to different outdoor units with
each other.
3) Replacement of male power supply switch connector(CN41) must be performed only on one of the outdoor
units.
4) Provide grounding to S terminal on the terminal block fortransmission line for centralized control (TB7) on only
one ofthe outdoor units.
5) When the power supply unit is connected to the transmission line for centralized control, leave the male connector on the female power supply switch connector
(CN41) as it is. (Factory setting)
(3) Maximum allowable length
1) Indoor/outdoor transmission line
2
Maximum distance (1.25mm
[AWG16] or larger)
L1, L2 200m [656ft]
2) Transmission line for centralized control
Maximum line distance via outdoor unit.
(1.25mm2[AWG16] or larger)
L1+L31+L2 500m [1640ft]
- 26 -
GBHWE07190
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[ II Restrictions ]
(4) Wiring method
1) Indoor/outdoor transmission line
Connect M1, M2 terminals of the indoor/outdoor trans-
mission line terminal block (TB3) on the outdoor unit
(OC) and A1, B1 terminals of the indoor/outdoor terminal
block (TB5-1) on the indoor unit (IC). (Non-polarized 2core cable)
Only use shielded cables.
Shielded cable connection
Connect the earth terminal of the OC and S terminal of
the IC terminal block (TB5-1).
2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block
for transmission line for centralized control (TB7) on
each outdoor unit (OC). Disconnect the male connector
(5) Address setting method
Procedures Unit or controller
1 Indoor
Main unit IC 01 to 50 Assign a sequential odd number
unit
Sub unit IC 01 to 50 Assign sequential numbers start-
Address
setting range
on the controller board from the female power supply
switch connector (CN41), and connect it to the female
power supply switch connector (CN40) on only one of the
outdoor units.
Only use shielded cables.
Shielded cable connection
To ground the shielded cable, daisy-chain the S-terminals on the terminal block (TB7) on each of the outdoor
units. Connect the S (shielded) terminal on the terminal
block (TB7) on the outdoor unit whose male connector
on CN41 was disconnected and connected to CN40 to
the earth terminal( ) on the electric box.
3) Switch setting
Address setting is required as follows.
Setting method Notes
Factory
setting
starting with "01" to the upper indoor controller.
ing with the address of the main
unit in the same group. (Main
unit address +1)
00
2 Outdoor unit OC 51 to 100 Add 50 to the address assigned
to the indoor unit connected to
the system with one outdoor unit.
3MA
remote
controller
Main
remote
controller
Sub
remote
controller
MA No settings
required.
MA Sub
remote
controller
-Main
Settings to be made with the sub/
main switch
00
HWE07190 GB
27- 27 -
Page 37
[ II Restrictions ]
3. System in which two MA remote controllers are connected to one indoor unit
(1) Sample control wiring
Leave the male
connector on
CN41 as it is.
TB7
M1M2
S
OC
51
TB3
M1M2
m1
L1
IC
01
TB5-1
A1B1
S
TB15
1
2
AB
MA(Main)
AB
MA(Sub)
*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).
m2
A1 B2
MA
02
TB5-2
A2 B2
S
(2) Notes
1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.
2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).
3) Although two indoor controllers (controller circuit boards)
are equipped inside the indoor unit, the board on No.2
side (lower side) is not used. Do not connect wiring to the
lower controller circuit board.
4) No more than two MA remote controllers (including both
main and sub controllers) can be connected to a group of
indoor units. If three or more MA remote controllers are
connected, remove the wire for the MA remote controller
from the terminal block (TB15).
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Same as [4] 1.
2) MA remote controller wiring
Maximum overall line length (0.3 to 1.25mm
16])
m1+m2 200m [656ft]
2
[AWG 22 to
- 28 -
GBHWE07190
Page 38
[ II Restrictions ]
(4) Wiring method
1) Indoor/outdoor transmission line
Same as [4] 1.
2) MA remote controller wiring
When 2 remote controllers are connected to the system
When two 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
MA remote controllers (option).
(5) Address setting method
Procedures Unit or controller
1 Indoor
Main unit IC 01 to 50 Assign a sequential odd number
unit
Sub unit IC 01 to 50 Assign sequential numbers start-
2 Outdoor unit OC 51 to 100 Add 50 to the address assigned
3MA
remote
controller
Main
remote
controller
MA No settings re-
Address
setting range
quired.
Set the Main/Sub switch on the connected MA remote
controllers (option) to SUB.(See the installation manual
for the MA remote controller for the setting method.)
3) Switch setting
Address setting is required as follows.
Setting method Notes
starting with "01" to the upper indoor controller.
ing with the address of the main
unit in the same group. (Main
unit address +1)
to the indoor unit connected to
the system with one outdoor unit.
-Main
Factory
setting
00
00
Sub
remote
controller
MA Sub
remote
controller
Settings to be made with the sub/
main switch
HWE07190 GB
29- 29 -
Page 39
[ II Restrictions ]
4. System in which two indoor units are grouped with the MA remote controller
(1) Sample control wiring
Leave the male
connector on
CN41 as it is.
TB7
M1M2
L1
OC
51
TB3
M1M2
S
m1 m2
IC
01
TB5-1
A1 B1
S
TB15
1
2
AB
MA(Main) MA(Sub)
Leave the male
connector on
CN41 as it is.
02
TB5-2
A2 B2
S
TB7
M1M2
m3
L1
TB5-1
A1
TB15
1
AB
IC
03
*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).
B1
S
2
OC
53
TB3
M1M2
S
04
TB5-2
A2 B2
S
(2) Notes
1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.
2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).
3) Although two indoor controllers (controller circuit boards)
are equipped inside the indoor unit, the board on No.2
side (lower side) is not used. Do not connect wiring to the
lower controller circuit board.
4) No more than two MA remote controllers (including both
main and sub controllers) can be connected to a group of
indoor units. If three or more MA remote controllers are
connected, remove the wire for the MA remote controller
from the terminal block (TB15).
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Same as [4] 1.
2) MA remote controller wiring
Maximum overall line length ( 0.3 to 1.25mm
16])
m1+m2+m3 200m [656ft]
2
[AWG22 to
- 30 -
GBHWE07190
Page 40
[ II Restrictions ]
(4) Wiring method
1) Indoor/outdoor transmission line
Same as [4] 1.
2) MA remote controller wiring
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). (Non-polarized 2-core cable)
(5) Address setting method
Procedures Unit or controller
1 Indoor
Main unit IC 01 to 50 Assign a sequential odd number
unit
Sub unit IC 01 to 50 Assign sequential numbers start-
2 Outdoor unit OC 51 to 100 Add 50 to the address assigned
3MA
remote
controller
Main
remote
controller
Sub
MA No settings
MA Sub
remote
controller
Address
setting range
required.
remote
controller
Set the Main/Sub switch on one of the MA remote con-
trollers to SUB.
3) Switch setting
Address setting is required as follows.
Setting method Notes
Factory
setting
starting with "01" to the upper indoor controller.
ing with the address of the main
unit in the same group. (Main
unit address +1)
to the indoor unit connected to
the system with one outdoor unit.
-Main
Settings to be made with the sub
/ main switch
00
00
HWE07190 GB
31- 31 -
Page 41
[ II Restrictions ]
[5] Restrictions on Pipe Length
1. Sample connection
(1) System with one refrigerant circuit
Outdoor unit
H
(2) System with two refrigerant circuits
A
L
Indoor
Allowable length Total pipe length (L) from the outdoor
Allowable height
difference
2. Refrigerant pipe size
Outdoor unit
A
H
L
unit to thefarthest indoor unit
Height difference between the indoor
and the outdoor units (H)
L
Indoor
Actual length 165m [541ft] or less
50m [164ft] or less (40m [131ft] or less when the outdoor
unit is lower, 15m [49ft] when the outdoor temperature is
10°C [50°F] or lower)
Outdoor unit model Liquid pipe (mm)[inch] Gas pipe (mm)[inch]
P250 model ø9.52 [3/8"] *1 ø22.2 [7/8"]
*1 Use the pipe whose size is ø12.7 [1/2"] when the pipe length is 90m [295ft] or more.
HWE07190 GB
- 32 -
Page 42
III
Outdoor Unit Components
[1] Outdoor Unit Components and Refrigerant Circuit .......................................................... 35
[2] Control Box of the Outdoor Unit....................................................................................... 37
[3] Outdoor Unit Circuit Board............................................................................................... 38
HWE07190 GB
- 33 -
Page 43
- 34 -
Page 44
[ III Outdoor Unit Components ]
III Outdoor Unit Components
[1] Outdoor Unit Components and Refrigerant Circuit
1. PUHY-P250YHM-A
(1) Front view of a outdoor unit
Fan guard
Fan
Heat exchanger
Front panel
Control
Box
Fin guard
HWE07190 GB
- 35 -
Page 45
[ III Outdoor Unit Components ]
2. PUHY-P250YHM-A
(1) Refrigerant circuit
Check valve
4-way valve(21S4b)
4-way valve(21S4a)
High pressure check joint
Low pressure check joint
Subcool coil
Linear Expansion
Valve(LEV1)
Solenoid valve(SV5b)
Linear Expansion Valve(LEV2a,2b)
Low pressure sensor(63LS)
Liquid side valve
Solenoid valve (SV1a)
Solenoid valve (SV9)
Gas side valve
High pressure sensor(63HS1)
High-pressure switch(63H1)
Accumulator
Compressor cover
Compressor
Oil separator
HWE07190 GB
- 36 -
Page 46
[ III Outdoor Unit Components ]
[2] Control Box of the Outdoor Unit
<HIGH VOLTAGE WARNING>
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.)
Electromagnetic relay(72C)
DC reactor (DCL)
Noise filter
Capacitor(C100)
Terminal block for power supply
L1,L2,L3,N,
(TB1)
Rush current protection resistor
(R1,R5) Note.2
Note.1
Fan board
INV board
Control board
M-NET board
Terminal block for transmission
line (TB3, TB7)
1) Exercise caution not to damage the bottom and the front panel of the control box. Damage to these parts affect the waterproof and dust proof properties of the control box and may result in damage to its internal components.
2) Faston terminals have a locking function. Make sure the cable heads are securely locked in place. Press the tab on the terminals to remove them.
HWE07190 GB
- 37 -
Page 47
[ III Outdoor Unit Components ]
[3] Outdoor Unit Circuit Board
1. Outdoor unit control board
CNAC2
L1
N
CN51
Output 12VDC
Compressor
ON/OFF output
Error output
Actuator
driving output
CNDC
Bus voltage input
P
N
CN2
Serial communication signal input
INV board)
GND (
Output 17VDC
CN801
Pressure switch
connection
CN332
Output 18VDC
GND
Fan board
)
(
CN4
GND
Serial communication signal output
LEV
driving output
LED1
Service LED
SWU1,2
Address switch
SW1-5
switch
Dip
CN72
72C
driving output
LED3
Lit
when powered
LED2
Lit during normal
CPU operation
CNAC
L1
N
LED3
Lit
when powered
F01
Fuse
250V AC/3.15A
External signal input (contact input)
CN102
Power supply input for centralized control system (30VDC)
Indoor/outdoor transmission line input/output (30VDC)
CN41
Power supply for
CN40
centralized control OFF
Power supply for
centralized control ON
Sensor
input
CNVCC2
Output 12VDC
Output 5VDC
CNIT
Output 12VDC
GND
Output 5VDC
Power supply detection input
CNS2
Transmission line input/output
for centralized control system (30VDC)
Power supply ON/OFF signal output
GND
HWE07190 GB
- 38 -
Page 48
[ III Outdoor Unit Components ]
2. M-NET board
Grounding
CN04
Bus voltage input
P
N
CNS2
Transmission line input/output for
CN102
Power supply output for centralized control system
Indoor/outdoor transmission line input/output
Grounding
Grounding
TB3
Indoor/outdoor
transmission block
centralized control system
Ground terminal for
transmission line
CNIT
Input 12VDC
GND
Input 5VDC
Power supply detection output
Power supply ON/OFF
signal input
TB7
Terminal block for
transmission line for
centralized control
LED1
Power supply for
indoor
transmission line
TP1,2
Check pins for
indoor/outdoor
transmission line
HWE07190 GB
- 39 -
Page 49
[ III Outdoor Unit Components ]
3. INV board
Bus voltage check
terminal (P)
Note
IGBT
(Rear)
CN1
Bus voltage output
N
P
Bus voltage check
terminal (N)
Note 1
SC-L1
Input(L1)
SC-L2
Input(L2)
SC-P1
SC-P2
Bus voltage Input(P)
Rectifier diode output (P)
CN6
Open: No-load operation setting
LED1
Lit: Inverter in normal operation
Blink: Inverter error
Short-circuited: Normal setting
CN5V
GND
Output 5VDC
RSH1
Overcurrent detection
resistor
CN4
GND
CNTYP Inverter
board type
SC-V
Inverter output(V)
SC-W
Inverter output(W)
SC-U
Inverter output(U)
(INV Board)
Serial communication
signal output
CN2
S
erial communication
signal output
GND
Input 17VDC
SC-L3
Input(L3)
CT22
Current sensor(W)
CT3
Current sensor(L3)
CT12
Current sensor(U)
C30 C37
Smoothing capacitor
1) 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.
HWE07190 GB
- 40 -
Page 50
[ III Outdoor Unit Components ]
4. Fan board
CNVDC
Bus voltage input
N
P
CNINV
Inverter output
W
V
U
R630,R631
Overcurrent detection
resistor
DIP IPM Rear
CN18V
Input 18VDC
GND
LED3
Lit during normal
CPU operation
CN4
GND
Serial communication signal output
CN5
GND(Control board)
Serial communication signal output
CN21
Serial communication signal output
GND(INV board)
Input 17VDC
CN22
GND(INV board)
Input 5VDC
Serial communication signal input
GND(INV board)
Output 17VDC
THBOX
Thermistor
(Control box internal temperature
detection)
LED1
Inverter in normal operation
LED2
Inverter error
HWE07190 GB
- 41 -
Page 51
[ III Outdoor Unit Components ]
5. Noise Filter
CN4
Output
(Rectified L2-N current)
P
N
CN2
Surge absorber circuit
Surge absorber circuit
Short circuit
Short circuit
F1,F2,F3,F4
Fuse
250VAC 6.3A
Grounding
CN1A
Input
N
L1
CN5
Output
(Rectified L2-N current)
P
N
Grounding
CN3
Output
L1
N
CN1B
Input
L3
L2
TB21
Input/output(L1)
TB22
Input/output(L2)
TB23
Input/output(L3)
TB24
Input(N)
HWE07190 GB
- 42 -
Page 52
IV
Indoor Unit Components
[1] External Dimensions ........................................................................................................ 45
[2] Indoor Unit Components and Internal Structure .............................................................. 47
[3] Control Box of the Indoor Unit.......................................................................................... 51
[4] Indoor Unit Circuit Board.................................................................................................. 52
[5] Separating the top and bottom of the unit........................................................................ 53
HWE07190 GB
- 43 -
Page 53
- 44 -
Page 54
[ IV Indoor Unit Components ]
IV Indoor Unit Components
[1] External Dimensions
1. PFD-P250VM-E model
400 or more
Unit front
figure
Indoor unit
Service space
Pipe execution
space
Unit surface
figure
500 or more200 or more
Service space
Indoor unit
800 or more
24)
ø
42)
ø
60)
60)
ø
ø
18
ø
Hole for gas pipe connecting(
Hole for liquid pipe connecting(
Bolt holes:8-
Main drain piping connection <Rp1-1/4>
Hole for the power supply(
Hole for the control wiring(
140
462
87
518
321
220
100
186
340
305
401
20
68
580
740
150
410
Air outlet
260
171
Unit : mm
20
100
Lifting bolts ......4pc.
Front panel opening and closing key ......1pc.
.
.
<Accessory>
Emergency drain piping connection <Rp1-1/4>
65
118 0
1340
24)
ø
<view from A>
100
20
100
20
<Rp1-1/4>
Drain piping connection
for humidifier
22.2 braze
ø
Refrig. piping <gas>
Panel
42)
ø
320
Hole for gas pipe connecting(
Hole for liquid pipe connecting(
220
Note 1. Be sure to set up a trap for Emergency
drain piping.
(Trap height:beyond 100mm)
(Trap is not necessary for main drain piping.)
2. Approve this figure because it is refused
for the improvement and specification
subject to change without notice.
3. Amputate a gas pipe/liquid pipe in the
fixed height at the time of 2 refrigerant
circuit connection, and connect it with
the local pipe.
Changeover switch(SW9)
Air inlet
Lifting bolts
Remote controller
<Nomal/Local>
Lamp
Power supply:White
Operating :Green
Check :Yellow
Failure :Red
Filter
(Accessory)
Air inlet
hole>
32 knock out
ø
<2-
Hole for the power
supply(Body)
1950
260
780
68
50
100
140
9.52 braze
ø
Control box
1380
Air outlet
50
50
390
100
32 knock out hole>
32 knock out hole>
ø
ø
A
Refrig. piping <liquid>
Hole for the control wiring <
Hole for the power supply <
32 knock out hole>
ø
Hole for the control wiring
<
HWE07190 GB
- 45 -
Page 55
[ IV Indoor Unit Components ]
2. PFD-P500VM-E model
400 or more
Unit front
figure
Unit : mm
Service space
Pipe execution
500 or more
200 or more
Indoor unit
Unit surface
space
Indoor unit
Panel opening
figure
Service space
1000 or more *1
and closing
dimension
Bolt holes:8-ø 18
Hole for No.1 gas pipe connecting(ø 42)
in 2 refrig. circuit system
Hole for gas pipe connecting(ø 48)
Main drain piping connecting<Rp1-1/4>
359
*1. It is necessary for the removal
of the panel beyond 600mm.
359 241
321
Hole for the power supply(ø 60)
Hole for the control wiring(ø 60)
Emergency drain piping connection <Rp1-1/4>
Drain piping connection
Hole for No.2 gas pipe
connecting(ø 42) in 2
refrig. circuit system
68
Hole for No.2 liquid pipe
Hole for liquid pipe connecting(ø 34)
Hole for No.1 liquid pipe connecting
(ø 24) in 2 refrig. circuit system
440
305
370
81
838
220
100
20
for humidifier
<Rp1-1/4>
135
connecting(ø 24) in 2
refrig. circuit system
135
185
120
150
171
410
Air
outlet
Air
outlet
379
580
740
124
2020
Hole for No.1 liquid side pipe connecting
(ø 24) in 2 refrig. circuit system
65
1940
<view from A>
100 1001780
100
20
Panel
Hole for gas side pipe connecting or
No.2 liquid side pipe connecting(ø 48)
Hole for No.2 gas side pipe connecting(ø 42)
Refrig. piping <gas> in 2 refrig. circuit system
type P450:ø 19.05 braze,
in 2 refrig. circuit system
in 2 refrig. circuit system
type P560:ø 22.2 braze No.2
Refrig. piping <liquid> in 2 refrig. circuit
system ø 9.52 braze No.2
710
680
320
220
Hole for liquid side pipe connecting
or No.1 gas side pipe connecting(ø 42)
in 2 refrig. circuit system
Refrig. piping <gas> in 2 refrig. circuit system
type P450:ø 19.05 braze, type P560:ø 22.2 braze No.1
124
68
68
Refrig. piping <gas> ø 28.58 braze
68
50100
780
Refrig. piping <liquid> ø 15.88 braze
Note 1. Be sure to set up a trap for Emergency
drain piping.
(Trap height:beyond 100mm)
(Trap is not necessary for main drain piping.)
2. Approve this figure because it is refused
for the improvement and specification
subject to change without notice.
3. Amputate a gas pipe/liquid pipe in the
fixed height at the time of 2 refrigerant
circuit connection, and connect it with
the local pipe.
Air inlet
<Accessory>
· Lifting bolts ······4pc.
<Normal/Local>
Changeover switch (SW9)
Lamp
Power supply :White
Operating :Green
· Front panel opening and closing key ······1pc.
(Accessory)
Lifting bolts
Remote controller
Air inlet
Check :Yellow
Failure1 :Red
Failure2 :Red
Filter
1950
hole>
<2-ø 32 knock out
Hole for the power
supply(Body)
50
50390
140
Control box
A
1980
Air outlet
100
Hole for the control wiring
Hole for the control wiring <ø 32 knock out hole>
Hole for the power supply <ø 32 knock out hole>
Refrig. piping <liquid> in 2 refrig. circuit system ø 9.52 braze No.1
<ø 32 knock out hole>
HWE07190 GB
- 46 -
Page 56
[ IV Indoor Unit Components ]
[2] Indoor Unit Components and Internal Structure
1. PFD-P250VM-E model
(1) Front view of a indoor unit
Lock key X 2
Panel for air filter maintenance
Panel for refrigerant circuit maintenance
Operation panel (remote controller)
Panel for controller/fan related parts maintenance
(2) Rear view of a indoor unit
Display lamp
HWE07190 GB
- 47 -
Page 57
[ IV Indoor Unit Components ]
(3) Front view of internal structure
Air filter
Suction temperature thermistor
(on the right side of heat exchanger)
Linear expansion valve (LEV)
Heat exchanger X 2 (front / back)
Sub drain pan
Drain pan
Drain hose
Pulley X 2
(on the back of controller)
Fan casing
Discharge temperature thermistor
(on the left side of fan casing)
(4) Rear view of internal structure
Controller
V belt
Pipes (gas/liquid)
Fan motor
Pipes (ga /liquid)
Drain hose
Fan casing
HWE07190 GB
- 48 -
Page 58
[ IV Indoor Unit Components ]
2. PFD-P500VM-E model
(1) Front view of a indoor unit
Panel for air filter maintenance
Panel for refrigerant circuit maintenance
Operation panel (remote controller)
Display lamp
Panel for controller maintenance
(2) Rear view of a indoor unit
Lock key X 4
Panel for fan related parts maintenance
HWE07190 GB
- 49 -
Page 59
[ IV Indoor Unit Components ]
(3) Front view of internal structure
Air filter
Suction temperature thermistor
(on the right side of heat exchanger)
Sub drain pan
Heat exchanger X 2 (front:No. 1; back:No. 2)
Drain pan
Bearing
Display lamp
Normal/Local switching switch(SW9)
Remote controller
(4) Rear view of internal structure
Controller
Discharge temperature thermistor
(on the left side of fan casing)
Fan casing
Operation panel
Fan motor
Linear expansion valve (LEV)
Pulley X 2
Drain hose
Pipes (gas/liquid)
V belt
<Location of drain pan overflow detection float switch>
Drain pan
Float switch X 2
Bearing
Pipes (gas/liquid)
HWE07190 GB
- 50 -
Page 60
[ IV Indoor Unit Components ]
[3] Control Box of the Indoor Unit
1. PFD-P250VM-E model
Transformer
Controller board
Circuit board for external I/O
Terminal block for transmission line (upper)
Terminal block for MA remote controller (lower)
Relay(X11,Z1,Z3)
Electro magnetic
contactor (52F)
Surge breaker (51F)
Fuse (F1)
Motor wiring
Surge absorber board
Power supply terminal bed
2. PFD-P500VM-E model
Adapter board for LEV
Circuit board for external I/O
Transformer
Controller board
Relay(X11,X12,Z1,Z2,Z3)
Terminal block for transmission
line on No.1 side
Terminal block for transmission line on No.2 side (upper)
Terminal block for MA remote controller (lower)
Electro magnetic
contactor (52F)
Fuse (F1)
Surge absorber board
Surge breaker (51F)
Motor wiring
Power supply terminal bed
HWE07190 GB
- 51 -
Page 61
[ IV Indoor Unit Components ]
[4] Indoor Unit Circuit Board
1. PFD-P250,P500VM-E models
(1) Indoor Control Board
CNT
Power supply output
(to transformer)
CND
Power supply
input
(AC 220~240V)
F901
Fuse
CN2M
Indoor unit
transmission
line
CN3T
Power supply input
(from transformer)
CN33
Lamp output
CN90
Fan output
LED2
CN3A
Remote controller connection
CNP
Drain pump
output
CN60
LEV output
SW1,2,3,4
Dip switch
CN24
Control signal
output
CN51
Switch input
CN31
Float switch input
Thermistor input
CN20
CN21
CN29
CN22
LED1
CN32
Switch input
SW5
SWC
Switching between
discharge/suction control
(2) External Input/Output Circuit Board
CN53
Indoor control board (No.1)
To CN51
TB23 (Input with voltage)
ON/OFF
TB21 (Input no voltage)
ON/OFF
CN54
Indoor control board (No.2)
To CN51
TB22 (Relay contact output)
No.1 operation status
No.1 error status
No.2 operation status
No.2 error status
HWE07190 GB
- 52 -
Page 62
[ IV Indoor Unit Components ]
[5] Separating the top and bottom of the unit
The top and the bottom of the unit can be separated.
(Requires brazing)
When separating the top and the bottom of the unit, perform the work on a level
Follow the procedures below when separating the sections.
Necessary tools and materials:
Ratchet wrench with a socket size of 17 mm (for M10)
General tools
Cable ties (for wires)
Gray vinyl tape (for pipes)
Supporting wood piece Height 800 mm x width 100 mm x thickness 20 (mm)
(1) Removing the decoration panel and filter
<Model 250>
Remove the front panels (2), rear panels (2), and the side panels (2) in this
Open the filter cover and remove the filters (2 filters).
<Model 500>
Remove the front panels (4), rear panels (3), and the side panels (2) in this
Open the filter cover and remove the filters (3 filters).
(2) Disconnecting the electric wires
Disconnect the wiring connectors from the remote controller, thermistor, float
After removing the connectors, pull out the wires from the control box.
Unclamp the wires from the frame.
Put all wires together in a bundle on the unit.
(3) Removing the drain hose and the pipes from the brazed section of the pipe
Remove the drain hose by unscrewing the screws on both ends of the hose
Peel off the pipe cover on the pipe so that the torch flame will not reach the
*Protect the section around the area to be worked on from the torch flame
(4) Separate the top and the bottom of the unit
Unscrew the screws and loosen bolt that are marked with the letter A in
Loosen bolt
2
loose enough to allow the top and
and bottom (Tightening torque:
1
the bottom of the unit to be separated. Be sure to re-tighten bolt after sepa
74N.m).
Separation work is now complete. Exercise caution not to damage or scratch the
surface.
1 piece
order by removing the hinges and the screws on the unit as shown in [Fig.1].
order by removing the hinges and screws on the unit as shown in [Fig.1].
switch, lamp , and linear expansion valve as shown in [Fig.2].
band.
cover. Remove the pipe from the brazed section as shown in [Fig.3].
(drain pan, wiring, insulation material on the frame etc).
[Fig.1] (on f our corners)
2
rating the top
unit during transportation or get your fingers caught between the units.
< Model 250 >
Filter cover
Side panel: 14 screws
Front panel: 6 screws
Front panel:
2 chains
Filters (2)
Detailed vie w of section A
Screw
Rear panel: 9 screws
Side panel: 14 screws
Rear panel: 8 screws
A
(on four corners)
1
Bolt
<Dimensions and weight of parts>
Screw
2
Bolt
Pull these pins up and down respectively
to remove the front panel.
< Model 500 >
Filters (3)
Side panel:
14 screws
Front panel:
2 hinges on each
Heat exchanger
unit (top)
Fan unit
(bottom)
Height (mm)
1120+510
*1
860
Width (mm)
P250:1380
P500:1980
P250:1380
P500:1980
* Length of protruded pipe (removable)
A
(on four corners)
[Fig.1]
Rear panel: 7 screws on each
Filter cover
Rear panel: 8 screws
Side panel: 14 screws
Depth (mm)
780
780
Weight (kg)
P250:158
P500:246
P250:128.5
P500:159
HWE07190 GB
- 53 -
Page 63
[ IV Indoor Unit Components ]
<Model 250>
Connect the wire from the lamp assy.
Bend the wire once, and fix the wire.
(the wire from the lamp assy.)
<Model 500>
Linear expansion valve wiring
Clamp
Remote controller wiring
Connect the wire from the lamp assy.
No. 1
No. 2
Fix the wire from the fan motor.
Thermistor wiring
Float switch wiring
Clamp
Lamp wiring
[Fig.2]
HWE07190 GB
- 54 -
Page 64
[ IV Indoor Unit Components ]
<Model 250>
Heat exchanger
(liquid pipe)
Heat exchanger
(gas pipe)
Drain pan
<Model 500>
Heat exchanger
(liquid pipe)
Heat exchanger
(gas pipe)
Unbraze these sections
(2 places on the gas pipe/
expanded part)
Unbraze this section
(1 place on the liquid pipe/
upper part of the strainer)
Unbraze these sections
(2 places on the liquid pipe
/upper part of the strainer)
Unbraze these sections
(2 places on the gas pipe
/upper part of the strainer)
Drain pan
Note
[Fig. 3]
1. Peel off the pipe cover carefully. The cover will be needed again when putting the units together.
2. When loading the unit on an elevator, place the separated sections upright as shown below.
(Place the right side up.) Place a piece of wood at the bottom of the bottom section for support to keep it level.
<Model 250>
Control box
Motor
To p
To p To p To p
Fan
<Model 500>
Heat exchanger
Control box
Motor
Fan
Heat exchanger
Bottom
Bottom section of the unit
HWE07190 GB
Supporting
wood piece
Bottom Bottom Bottom
Top section of the unit Bottom section of the unit Top section of the unit
Piping side
- 55 -
Supporting
wood piece
Piping side
Page 65
[ IV Indoor Unit Components ]
To put the top and bottom sections of the unit together, follow the procedures above in the reverse order.
Check to make sure that the frame is perpendicular to the horizontal plane before putting the panels together.
When the frames will not fit back into place, loosen bolt 2 as shown in [Fig.1], place the frames, and tighten bolt 2 .
Be sure to securely tighten all screws and bolts. (tightening torque: 74N.m)
Using [Fig.4] and Table 1 as a reference, connect all connectors correctly.
Use a cable tie and bundle the wires as they were before.
Keep torch flame away from the insulation material on the drain pan and from other flammable materials when
performing brazing work. Use the shielding board that is supplied.
Perform a test run and check for abnormal sound, rattling, and water leaks.
<Model 250>
Board No.
No.1
Connector
CN31
CN20
CN21
CN29
CN60
Wire
mark
1
S1
E1
G1
V1
Table 1
Connector
color
White
Red
White
Black
White
No. of
pins
Float switch
3
Inlet thermistor
2
Liquid pipe thermistor
2
Gas pipe thermistor
2
Linear expansion valve
6
Parts name
CN60
No. 1 board
CN31
CN20
CN21
CN29
CN22
Connector location on the board
[Fig. 4]
<Model 500>
Board No.
No.1
No.2
Connector
CN31
CN20
CN21
CN29
LEV2A
CN31
CN20
CN21
CN29
LEV2B
Wire
mark
1
S1
E1
G1
V1
2
S2
E2
G2
V2
Table 1
Connector
color
White
Red
White
Black
White
White
Red
White
Black
White
No. of
pins
3
Float switch
2
Inlet thermistor
2
Liquid pipe thermistor
2
Gas pipe thermistor
6
Linear expansion valve
3
Float switch
2
Inlet thermistor
2
Liquid pipe thermistor
2
Gas pipe thermistor
6
Linear expansion valve
Parts name
No. 1 board
*Same with the No. 2 board
Connector location on the board Connector location on the adapter board
CN31
CN20
CN21
CN29
LEV2B
[Fig. 4]
Caution
Use a hand-lift truck to transport the units; they are heavy even when the top and button sections are separated.
Carrying the units by hand is dangerous and may result in personal injury if the units fall or topple over.
Exercise caution not to get your fingers caught when separating or assembling the top and bottom sections of
the unit.
LEV2A
HWE07190 GB
- 56 -
Page 66
V
Electrical Wiring Diagram
[1] Electrical Wiring Diagram of the Outdoor Unit .................................................................59
[2] Electrical Wiring Diagram of the Indoor Unit .................................................................... 60
HWE07190 GB
- 57 -
Page 67
- 58 -
Page 68
[ V Electrical Wiring Diagram ]
VElectrical Wiring Diagram
[1] Electrical Wiring Diagram of the Outdoor Unit
1. Electrical wiring diagram of the outdoor unit
(1) PUHY-P250YHM-A
LEV2b
LEV2a
63H1
LEV1
M
12345
6
CNLVA
P
CN4
752
CN332
blue
CNT02
13 12 21 21
CN801
yellow
12
CNT01
CPU power
supply circuit
CNDC
pink
31
6
CN2
M
CNLVB
1
ZNR01
CN72
2
red
red
1
12345
54321
6
Power failure
detection circuit
U
CNAC2
black
1
2
M
red
CNLVC
LED1
Control Board
X02
X01
CN502
CN501
3
2
1
1
3
1
black
CNTYP2
ONOFF
SW1
1
LED1
Display
10
ONOFF
SW2
1
10
ONOFF
SW3
1
10
ONOFF
1
ONOFF
1
SWU2 SWU1
X03
CN503
blue
3
1
1's
digit
10's
digit
3
SW4
10
SW5
10
Unit address
X04
CN504
green
653
1
setting
CN506
Function
setting
X05
1
TH6
ttt
Z25
Z24
1
321
432
CN213
green
green
CNTYP5
CNTYP4
setting
*3
Compressor ON/OFF output
Error detection output
543
1
CN51
12V
X08
X07
X06
CN507
red
653
135
6
TH7
TH3
1
2
1
red
CN212
LED3:Lit when powered
X09
CN508
black
1
2
X10
TH5
t
1
CN990
TH2
63LS
63HS1
213
213
t
321
231
2
1
red
black
CN202
CN201
CN215
ON
TB7 Power
selecting
connector
CN40
1234
LED2:CPU in operation
F01
AC250V
TH4
t
2
1
CN211
red
yellow
red
blue
yellow
3.15A T
CNIT
CNS2
CN41
CN102
CN3D
CN3S
CN3N
CN3K
51234
21
OFF
1234
4321
123
123
123
12
21 3
red
CNAC
1
21 5432
4321
CN04
13
red
TP2TP1
CNIT
red
SM2M1
TB7
M1 M2
CNS2
yellow
TB3
CN102
LED1:Power supply to
Indoor/Outdoor transmission line
M-NET power
supply circuit
M-NET Board
Central control
transmission
cable
Indoor/Outdoor
transmission
cable
Indoor/Outdoor
transmission
cable
*4
*3
234
1
blue
CN21
CN5
red
CN4
21 1 3 12
LED3:CPU in
blue
CN18V
F01
DC700V
4A T
FAN Board
6
5
72C
2
654
3
red
CN22
operation
IPM
R631
R630
C631
C630
4
1
CNVDC
Fan motor
(Heat exchanger)
1
THBOX
V
U
M
21S4b
t
operation
LED1:Normal
LED2:Error
471
CNINV
W
3
C100
SV1a
CH11
SV5b
21S4a
1
2
CN2
CN4
1
CN5V
yellow
C1
21 3
CN6
/Error(blink)
2
43
black
72C
1
red
red
LED1 Normal operation(lit)
SC-P1
FT-P
FT-N
*6
P
N
SC-P2
4
1
CN1
3
1
Z5
R5
red
CN5
D1
R4
R6
CN4
blue
C17
31
DSA
653
1
CN2
*5
black
R1 R5
DCL
15271
RSH1
C31
C30
Diode
U
Noise
U
Z4
F1,F2,F3
AC250V
3
IGBT
C33
C35
C32
C34
Bridge
Filter
F3F2F1
6.3A T
CNTYP
THHS
t
C37
C36
SV9
black
SC-V
R31
R33
R30
R32
F4
AC250V
6.3A T
C6
C5
C4
C10
C3
Z3
UUU
Z1 Z2
*1.Single-dotted lines indicate wiring
not supplied with the unit.
*2.Dot-dash lines indicate the control
box boundaries.
*3.Refer to the Data book for connecting
input/output signal connectors.
*4.Daisy-chain terminals (TB3) on the
outdoor units in the same refrigerant
system together.
*5.Faston terminals have a locking
function.Make sure the terminals
are securely locked in place after
insertion.Press the tab on the
terminals to removed them.
*6.Control box houses high-voltage parts.
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.
SC-W
red white black
SC-U
SC-L1
R35
R34
C7C8C9
C2
CT12 CT22
SC-L2
SC-L3
CT3
black
white
red
INV Board
3
1
CN3
green
black
white
red
C1
L
TB24
N
TB23
L3
TB22
L2
TB21
L1
CN1B
R1R2R3
4131
CN1A
blackwhitered
W
3
V
MS
Motor
(Compressor)
U
Explanation
Subcool bypass outlet
temperature
Subcooled liquid refrigerant
Indoor/Outdoor transmission
cable
Central control transmission
cable
Power supply
For opening/closing the bypass
circuit
Thermistor
Terminal
block
Solenoid
valve
Symbol
SV9
NL3L2L1
NL3L2L1
TB1
TB3
TB7
TH2
temperature
Discharge pipe temperature
ACC inlet pipe temperature
OA temperature
IGBT temperature
Pipe temperature
Control box internal temperatureTHBOX
Function setting connector
Z24,25
THHS
TH7
TH6
TH5
TH4
TH3
Explanation
TB1
3N
50/60Hz
380/400/415V
Power Source
High pressure protection for the
outdoor unit
Low pressure
Discharge pressure
Magnetic relay(inverter main circuit)72C
Pressure
switch
Pressure
sensor
4-way valve21S4a,b
Symbol
63LS
63H1
63HS1
<Symbol explanation>
Pressure control,Refrigerant flow
rate control
HIC bypass,Controls refrigerant
flow in HIC circuit
Outdoor unit heat exchanger
capacity control
For opening/closing the bypass
circuit under the O/S
DC reactorDCL
Linear
expansion
valve
Solenoid
LEV1
LEV2a,b
valve
SV1a
SV5b
Current sensor(AC)
CT12,22,3
CH11 Crankcase heater(for heating the compressor)
HWE07190 GB
- 59 -
Page 69
[ V Electrical Wiring Diagram ]
[2] Electrical Wiring Diagram of the Indoor Unit
1. PFD-P250VM-E
NAME
Surge absorber board
Fan motor
Indoor controller board
Power source terminal bed
Transmission terminal bed
External input/output board
SYMBOL
MF
I.B.
S.B.
IFB
TB2
TB5
RC
1
1
Inside section of control box
Surge absorber
Fuse<6-3/6A>
Varistor
Transformer
Transmission terminal bed
Terminal bed for distant location on/off
<No voltage or current>
TB15
TB21
Indoor unit
2
2
TB15
SHIELD
Fuse<5A>
Terminal bed for distant location on/off
<With voltage and current>
Terminal bed for distant location display
DSA1
F901
TB22
Control wiring
ZNR1, ZNR2, ZNR901
TB23
F1
DC24~30V
LED display(failure)
LED display(status)
L2
L1
216
5
TB5
A1SB1
CN1
1
1
ZNR1
T
u
Float switch
Electronic linear expan.valve
Contactor(fan I/D)
Over current relay (fan I/D)
Thermistor (inlet temp.detection)
Switch (for mode selection)
Switch (for capacity code)
Switch (for mode selection)
Thermistor (piping temp.detection/gas)
Thermistor (piping temp.detection/liquid)
Thermistor (outlet temp.detection)
LEV
52F
51F
33P1
TH22
TH21
Power supply
3N~
LED display(power supply)
L4
3
1
2
L2
L1
3
F1
3
DSA1
S.B.
380/400/415V(50Hz)
L3
SW3(I.B.)
SW2(I.B.)
SW1(I.B.)
TH24
TH23
Switch(normal/local)
400/415V(60Hz)
SW9
PE
345
TB2
N
Switch (for model selection)
Switch (normal/local)
SW9
SW4(I.B.)
Distant location on/off
Power supply DC12~24V
6
AC
Auxiliary relay(check)
Switch (1st digit address set)
Switch (2nd digit address set)
SW14(I.B.)
SW12(I.B.)
SW11(I.B.)
Distant location on/off
<no voltage or current>
<with voltage and current>
B2B1BCA2A1
TB23
TB21
CN53
1
LED display (failure)
Auxiliary relay(fan failure detection)
Auxiliary relay(fan)
L1
Z3
Z1
X11
SWC(I.B.)
Failure output
Status output
Power supply DC30V, AC100/200V
L
L
54321
C
TB22
CN54
234515432
Switch (outlet/inlet temp.control)
Switch (connection No.set)
(field supply
and construction)
LED display (power supply)
LED display (status)
LED display (check)
MA Remote controller
RC
L4
L3
L2
LED display(check)
L3
1
2
X11
IFB
External input adapter
The signal input of the dehumidify order is to
connect wiring referring to the bottom figure.
Indoor unit
PE
Power
SW
Distant control panel
Z
Z
Relay circuit
5(green)
1(brown)
(PAC-SA88HA)
CN52
control board
Z:Relay (Contact : Minimum applicable load
DC12V 1mA or less)
SW:Defumidify order
Dehumidify
X11
I.B.
65432
1
5432
1
CN7V
2121
321
CN3A
CN51
CN52
7123456
CN24 CN25
2
1
CN2M
Address
(odd)
3
2
4
1
0
6
9
7
8
3
2
4
1
5
0
6
9
7
8
4
5
3
6
2
7
1
0
F
A
E
B
D
C
X04
X06 X05
ZNR1
F901
5
8
9
321
CN32
X07
X01
DSA1
u
ZNR901
SW11
(1st digit)
SW12
(2nd digit)
SW14
SW8
SWC SW5
u
SW7 SW2 SW1SW3
SW4
CN90CN33
CNP
CNT CND
CN3T
CN28 CN31CN29CN20 CN21 CN60CN22
ZNR2
51F
97513131311
Z1
3
T
1234561232121212112
33P1
Z3
Z1
t
TH24
u
Z3
52F
ttt
TH21
TH22
FAN
over current
detection
TH23
65432
LEV
52F
51F
1
MF
Note: 1. The dotted lines show field wiring.
2. The address setting of the indoor unit should always be odd.
3. The outdoor unit to which the indoor unit is connected with the transmission line,
the address of the outdoor unit should be the indoor unit +50.
4. Mark indicates terminal bed, connector, board insertion connector
or fastening connector of control board.
HWE07190 GB
- 60 -
Page 70
[ V Electrical Wiring Diagram ]
2. PFD-P500VM-E
NAME
Surge absorber board
Fan motor
Indoor controller board
Adapter board
Power source terminal bed
Transmission terminal bed
External input/output board
Transmission terminal bed
Terminal bed for distant location on/off
Terminal bed for distant location on/off
<No voltage or current>
Terminal bed for distant location display
Surge absorber
Varistor
Transformer
Electronic linear expan.valve
Contactor(fan I/D)
<With voltage and current>
Fuse <6.3/6A>
Fuse <5A>
Over current relay (fan I/D)
Float switch
Thermistor (inlet temp.detection)
Switch (for mode selection)
Switch (for capacity code)
Switch (for mode selection)
Switch (for model selection)
Switch (normal/local)
Switch (1st digit address set)
Thermistor (piping temp.detection/gas)
Thermistor (piping temp.detection/liquid)
Thermistor (outlet temp.detection)
Switch (2nd digit address set)
LED display (No.2 failure)
LED display (status)
LED display (check)
Switch (outlet/inlet temp.control)
Switch (connection No.set)
Auxiliary relay(check)
Auxiliary relay(fan failure detection)
Auxiliary relay(fan)
LED display (power supply)
LED display (No.1 failure)
B
A
...
....
MA Remote controller
The case of no-voltage input
The case of with-voltage input
When using the external input function on the indoor unit
that is connected to a two-refrigerant circuit, connect the
short-circuit plate that is supplied with the unit to the
appropriate terminals on the external input-output board.
(field supply
and construction)
Power
SW
Distant control panel
Z
Z
Relay circuit
1(brown)
5(green)
SYMBOL
S.B.
AD.B.
I.B.1, I.B.2
MF
Inside section of control box
Dehumidify
X11
IFB
RC
1
1
TB2
2
2
I.B.1
45
2
13
45
3
2
1
CN7V
2
1
2
1
TB15
TB5-1, -2
TB15
SHIELD
3212321
1
CN3A
CN2M
X06 X05 X04X01 X07
CN51
ZNR1
u
CN52
F901
No.1
6574321CN24 CN25
Address
(odd)
3
2
4
1
5
0
6
9
7
8
3
2
4
1
5
0
6
9
7
8
4
5
3
6
2
7
1
8
0
9
F
A
E
B
D
C
TB21
TB23
TB22
LED display(No.1 failure)
DC24~30V
No.1 Indoor unit
Control wiring
L1
216
TB5-1
A1SB1
CN32
CN90
13
CN33CNP
31
591513731
CND
DSA1
CNT
u
ZNR901
CN3T
31
T
1
3222
CN60
12321
CN31
CN29
11
CN21
CN20
21 654
CN22
21
CN28
SW11
(1st digit)
SW1SW3
SW12
(2nd digit)
SW14
SW8
SWC SW5
SW4 SW7 SW2
F1
F901
ZNR1, ZNR2, ZNR901
LED display(status)
L3
5
3
1
CN1
1
3
ZNR1
u
51F
Z1
33P1
Z3
ttt
TH24-1
DSA1
51F
52F
LEV1, 2
T
Power supply
3N~
LED display(power supply)
L5
1
2
3
L3
L2
L1
F1
DSA1
S.B.
ZNR2
u
Z3
Z2
52F
Z1
AD.B.
LEV1B
6543 126543 12
LEV1
6543 12
LEV1A
t
TH21-1
TH22-1
TH23-1
TH21-1, TH21-2
33P1, 33P2
380/400/415V(50Hz)
400/415V(60Hz)
N
FAN
over current
detection
LEV1
TH24-1, TH24-2
SW1(I.B.)
TH23-1, TH23-2
TH22-1, TH22-2
Switch(normal/local)
SW9
Power supply DC12~24V
PE
345
6
TB2
AC
Dehumidify
12345
6654321
LEV2
SW2(I.B.)
SW3(I.B.)
SW4(I.B.)
SW11(I.B.)
SW12(I.B.)
SW9
No1.Failure output
Distant location on/off
<no voltage or current>
No1.Status output
Distant location on/off
<with voltage and current>
No2.Status output
No2.Failure output
Power supply DC30V, AC100/200V
L
L
L
L
C
B2B1BCA2A1
TB22
TB21
TB23
CN54
CN53
54321
123
1
123
213
2
<note2>
CN3A1CN2M
CN32
X04X05X06
I.B.2
X07
54321
X01
CN51
ZNR1
u
54321
CN52
F901
ZNR901
1234567
No.2
Address
(odd)
12 CN7V
CN25CN24
3
2
X12
4
1
5
0
6
9
21
7
8
3
2
4
1
5
0
6
9
7
8
4
5
3
6
2
7
1
8
0
9
F
A
E
B
D
C
A
B
L5
SW14(I.B.)
SWC(I.B.)
X11, X12
Z1, Z2Z3L1L2L3
LED display(No.2 failure)
DC24~30V
No.2 Indoor unit
Control wiring
L2
3
4
TB5-2
S
54321
A2
B2
SHIELD
DSA1
u
SW11
(1st digit)
SW12
(2nd digit)
SW14
SW8
SW5
SWC
IFB
CN90
CNP CN33
CND
CNT
CN3T
CN60
CN31
CN29
CN22 CN21CN20
CN28
SW3 SW1SW2SW7SW4
X12
Z2
531
T
1234563113 731 51139
<note2>
33P2
12321
1122
12
12
Z3
L4
LED display(check)
L4
1
2
X11
52F
51F
ttt
TH24-2
TH21-2
TH22-2
RC
ACA1A2BCB1
TB23
External input-output
board (IFB)
<note2>
PE
t
TH23-2
12321
CN3A
CN2M
I.B. 2
CN60
654321
Remove the LEV1B connector
from AD.B. board, and
connect it to CN60 of
I.B.2 board.
How to connect in case of 2 refrigerant circuit.
MF
1. The dotted lines show field wiring.
2. It is wiring for 1 refrigerant system at the time of shipping.
Change wiring and SW2, 3, 4 (No.1&No.2) as this figure in field
when you change it to 2 refrigerant circuit
Note:
3. Set up the address of No.1 board in the odd number, and set up the
B2
TB21
The signal input of the dehumidify order is to
Connect a connector to
CN3A, CN2M of I.B.2
board.
65432
1
LEV2
address of No.2 board in the even number.
But, set up the address of the No.2 board in the No.1 board +1.
4. The outdoor unit to which the indoor unit is connected with the
Z:Relay (Contact : Minimum applicable load
DC12V 1mA or less)
External input adapter
(PAC-SA88HA)
CN52
Indoor unit
control board
connect wiring referring to the bottom figure.
<note2>
ON
ON
SW2 SW3 SW4
ON
PFD-P500VM-E
1 refrigerant
circuit
How to set up to SW2, 3, 4.
(In case of 2 refrigerant circuit)
transmission line, the address of the outdoor unit should be the
indoor unit +50.
5. Mark indicates terminal bed, connector, board insertion connector
or fastening connector of control board.
SW:Defumidify order
54321ON5432110987
65432110987
654321
ON
654321
654321
ON
(at the time of shipping)
2 refrigerant
circuit
HWE07190 GB
- 61 -
Page 71
- 62 -
Page 72
VI
Refrigerant Circuit
[1] Refrigerant Circuit Diagram ............................................................................................. 65
[2] Principal Parts and Functions .......................................................................................... 67
HWE07190 GB
- 63 -
Page 73
- 64 -
Page 74
[ VI Refrigerant Circuit ]
VI Refrigerant Circuit
[1] Refrigerant Circuit Diagram
1. System with one refrigerant
(1) PUHY-P250YHM-A
TH7
SV5b
21S4b
TH3
SV9
21S4a
CV1
CP2
TH2
SCC(HIC circuit)
LEV1
TH4
O/S
COMP
CJ1
63H1
63HS1
TH6
ST3
SV1a
CP1
LEV2a
LEV2b
ST7
ACC
ST6
63LS
TH5
CJ2
ST1
ST2
BV1
TH23
TH22
BV2
HWE07190 GB
- 65 -
Page 75
[ VI Refrigerant Circuit ]
2. System with two refrigerant circuits
(1) PUHY-P250YHM-A x 2
TH7
SV5b
TH7
21S4b
TH3
21S4b
SV9
21S4a
CV1
CP2
TH2
SCC(HIC circuit)
21S4a
CV1
LEV1
TH4
TH4
O/S
COMP
O/S
CJ1
63H1
63HS1
TH6
CJ1
63H1
63HS1
ST3
ST3
SV1a
CP1
SV1a
CP1
LEV2a
LEV2b
ST7
ACC
ST6
ACC
63LS
TH5
63LS
TH5
CJ2
CJ2
ST1
ST2
ST1
BV1
BV2
BV1
TH23-1
TH22-1
TH23-2
TH22-2
COMP
ST6
LEV2a
LEV2b
ST7
ST2
BV2
SV9
SV5b
TH3
HWE07190 GB
CP2
TH2
SCC(HIC circuit)
LEV1
TH6
- 66 -
Page 76
[ VI Refrigerant Circuit ]
[2] Principal Parts and Functions
1. Outdoor unit
Part
name
Compressor
High
pressure
sensor
Low
pressure
sensor
Pressure
switch
Symbols
(functions)
MC1
(Comp1)
Notes Usage Specifications Check method
Adjusts the amount of circulating
refrigerant by adjusting the operating frequency based on the operating pressure data
63HS1 1) Detects high pressure
2) Regulates frequency and provides high-pressure protection
63LS 1) Detects low pressure
2) Provides low-pressure protection
63H1 1) Detects high pressure
2) Provides high-pressure protection
250 models
Low-pressure shell scroll
compressor
Wirewound resistance
20°C[68°F] : 0.981ohm
Pressure
0~4.15 MPa [601psi]
63HS1
Vout 0.5~3.5V
123
0.071V/0.098 MPa [14psi]
Connector
Connector
Pressure [MPa]
=1.38 x Vout [V]-0.69
Pressure [psi]
=(1.38 x Vout [V] - 0.69) x 145
1
GND (Black)
2
Vout (White)
3
Vcc (DC5V) (Red)
Pressure
63LS
0~1.7 MPa [247psi]
Vout 0.5~3.5V
123
0.173V/0.098 MPa [14psi]
Pressure [MPa]
=0.566 x Vout [V] - 0.283
Pressure [psi]
=(0.566 x Vout [V] - 0.283) x 145
1
GND (Black)
2
Vout (White)
3
Vcc (DC5V) (Red)
4.15MPa[601psi] OFF setting
HWE07190 GB
- 67 -
Page 77
[ VI Refrigerant Circuit ]
Part
name
Thermistor
Symbols
(functions)
TH4
(Discharge)
Notes Usage Specifications Check method
1) Detects discharge air temperature
2) Provides high-pressure protection
0°C[32°F] :698kohm
10°C[50°F] :413kohm
20°C[68°F] :250kohm
30°C[86°F] :160kohm
40°C[104°F] :104kohm
50°C[122°F] : 70kohm
60°C[140°F] : 48kohm
70°C[158°F] : 34kohm
80°C[176°F] : 24kohm
90°C[194°F] :17.5kohm
100°C[212°F] :13.0kohm
110°C[230°F] : 9.8kohm
TH2 LEV 1 is controlled based on the
TH2, TH3, and TH6 values.
TH3
(Pipe
temperature)
1) Controls frequency
2) Controls defrosting during
heating operation
3) Detects subcool at the heat
exchanger outlet and controls
LEV1 based on HPS data
and TH3 data
TH7
(Outdoor temperature)
1) Detects outdoor air temperature
2) Controls fan operation
TH5 LEV2a and LEV2b are controlled
based on the 63LS and TH5 values.
Degrees Celsius Resistance
R = 7.465k
120
R = 4057
25/120
R =
t
7.465
exp
4057
Degrees Celsius
R = 15k
0
R = 3460
0/80
exp
R = 15
t
3460
1
273 t
273 t
393
1
check
1
Resistance
check
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
Solenoid
valve
TH6 Controls LEV1 based on TH2,
TH3, and TH6 data.
THHS
Inverter
heat sink temperature
Controls inverter cooling fan
based on THHS temperature
Degrees Celsius
R = 17k
50
R = 4016
25/120
exp
R = 17
t
4016
1
273 t
323
1
THBOX
Control box internal temperature detection
0°C[32°F] :161kohm
10°C[50°F] :97kohm
20°C[68°F] :60kohm
25°C[77°F] :48kohm
30°C[86°F] :39kohm
40°C[104°F] :25kohm
SV1a
Discharge-suction
bypass
1) High/low pressure bypass at
start-up and stopping, and
capacity control during lowload operation
AC208-230V
Open while being powered/
closed while not being powered
2) High-pressure-rise prevention
SV5b
Heat
Controls outdoor unit heat ex-
changer capacity
exchanger
capacity control
SV9 High-pressure-rise prevention Open while being powered/
closed while not being powered
Continuity
check with a
tester
HWE07190 GB
- 68 -
Page 78
[ VI Refrigerant Circuit ]
Part
name
Linear
expansion
Symbols
(functions)
LEV1
(SC control)
Notes Usage Specifications Check method
Adjusts the amount of bypass flow
from the liquid pipe on the outdoor
unit during cooling
valve
LEV2a
LEV2b
Adjusts refrigerant flow during
heating
(Refrigerant
flow adjustment)
Heater CH11 Heats the refrigerant in the com-
pressor
4-way
valve
21S4a Changeover between heating and
cooling
21S4b 1) Changeover between heating
and cooling
2) Controls outdoor unit heat exchanger capacity
DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
(direct driven type)
DC12V
Opening of a valve driven by a
stepping motor 1400 pulses
Cord heater AC230V
P250 model
1511 ohm 35W
AC208-230V
Dead: cooling cycle
Live: heating cycle
AC208-230V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 50%
or heating cycle
Same as indoor LEV
The resistance
value differs
from that of the
indoor LEV.
(Refer to the
section "LEV
Troubleshooti
ng."(page 167
))
Same as indoor LEV
Resistance
check
Continuity
check with a
tester
HWE07190 GB
- 69 -
Page 79
[ VI Refrigerant Circuit ]
2. Indoor unit
Part
name
Linear expansion
valve
(LEV)
Symbols
(functions)
Notes Usage Specifications Check method
LEV 1) Adjusts superheat at the
heat exchanger outlet of the
indoor unit during cooling
2) Adjusts subcool at the heat
DC12V
Opening of a valve driven by
a stepping motor
0-(2000) pulses
exchanger outlet of the indoor unit during cooling
Thermistor
TH21
(Suction
air temperature)
TH22
(Pipe temperature)
TH23
(Gas pipe
tempera-
Indoor unit control (Thermo)
Indoor unit control (Freeze prevention, Pre-heating stand-by)
LEV control during cooling operation (Superheat detection)
R = 15k
0
R = 3460
0/80
exp
R = 15
t
3460
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
ture)
TH24
(Dis-
Controls indoor unit discharge
(thermostat)
charge air
temperature)
Float
Switch
33P1 Detects drain pan water level Contact Resistance:
33P2 P500
model
Under 250 mohm
B contact type
only
Motor MF Sends air PFD-P250VM-E
AC380~415V Type E 4P
Output 3.7kW
1
273 t
Continuity check
with a tester
Continuity between white, red,
and orange.
Continuity between yellow,
brown, and blue.
Orange
Resistance check
1
273
Continuity check
with a tester
Rotation number
check
Standard 930rpm
White
Red
YellowMBlueBrown
PFD-P500VM-E
AC380~415V Type B 4P
Output 5.5kW
HWE07190 GB
- 70 -
Rotation number
check
Standard 978rpm
Page 80
VII
Control
[1] Functions and Factory Settings of the Dipswitches ......................................................... 73
[2] Controlling the Outdoor Unit ............................................................................................ 78
[3] Controlling the Indoor Unit ...............................................................................................89
[4] Operation Flow Chart....................................................................................................... 93
HWE07190 GB
- 71 -
Page 81
- 72 -
Page 82
[ VII Control ]
VII Control
[1] Functions and Factory Settings of the Dipswitches
1. Outdoor unit
(1) Control board
Switch Function
Function according to switch setting Switch setting timing
OFF ON OFF ON
SWU 1-2 Unit address setting Set to 51-100 with the dial switch Before power on
SW1 1-10
For self-diagnosis/operation monitoring
Refer to the LED monitor display on the outdoor
unit board.
Anytime after power on
1- - - -
Deletion of connection
2
information
Deletion of error history SW(OC) Storage of IC/OC
3
Normal control Deletion Before power on
Anytime after power on
(When switched from OFF to
ON)
error history
(OC) Deletion of IC/
OC error history
After being energized and
4 Pump down mode Normal control Pump down mode
while the compressor is
stopped
5- - - -
SW2
6- - - -
10 minutes
Forced defrost
7
Note 2
Normal control Forced defrost starts
after compressor startup
Defrost timer setting
8
Note 2
50 minutes 90 minutes
Anytime after power on
(When switched from OFF to
ON)
Anytime after
power on
(When
switched from
OFF to ON)
9- - - -
10 - - - -
1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.
2) Refer to "VII [2] Controlling the Outdoor Unit" for details.(page 78)
HWE07190 GB
- 73 -
Page 83
[ VII Control ]
Switch Function
Test run mode: en-
1
abled/disabled
2 Test run mode: ON/OFF Stops all ICs
Defrost start tempera-
3
ture
Defrost end tempera-
4
ture
SW3
5- - - -
6- - - -
7- - - -
8- - - -
9 Model setting
10 Model setting
1- - - -
2- - - -
Function according to switch setting Switch setting timing
OFF ON OFF ON
SW3-2 disabled SW3-2 enabled Anytime after power on
Sends a test-run signal
to all ICs
After power on and when
SW3-1 is on.
-10°C [14°F] -5°C [23°F] Anytime after power on
10°C [50°F] 15°C [59°F]
Outdoor standard static pressure
High static pressure
60Pa
Outdoor high static
pressure
High static pressure
30Pa
Anytime after power on (except during defrost operation)
Before being energized
Before being energized
Anytime after being energized (except during initial
Refrigerant amount ad-
3
justment
Normal operation
mode
Refrigerant amount
adjust mode
startup mode.
Automatically cancelled 60
minutes after compressor
startup)
SW4
Low-noise mode/step
4
demand switching
5- - - -
Cumulative compres-
6
sor operation time data
deletion
Low-noise mode
Note 2
Cumulative compressor operation time data
is retained.
Step demand mode Before being energized
Cumulative compressor operation time data
is deleted.
Anytime after power on (when
the unit is turned on)
7- - - -
8- - - -
9- - - -
Dehumidifying opera-
10
tion priority mode:
Enabled Disabled Anytime after being powered
Enable/Disable
1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.
2) The noise level is reduced by controlling the compressor frequency and outdoor fan rotation speed.
Setting of CN3D is required.(page 22)
HWE07190 GB
- 74 -
Page 84
[ VII Control ]
Switch Function
Function according to switch setting Switch setting timing
OFF ON OFF ON
1
2
Model selection See the table below Note 3 Before being energized
3
4
SW5
Low-noise mode se-
5
lection
6- - - -
Capacity priority mode
Note 2
Low-noise mode Before being energized
7 Model selection See the table below Note 3 Before being energized
8- - - -
9- - - -
System rotation con-
10
trol
No units are specified
as the control unit
Control unit is specified.
While the unit is stopped
(When the switch is turned
from OFF to ON)
1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.
2) When set to the capacity priority mode and if the following conditions are met, the Low-noise mode will terminate, and the unit
will go back into the normal operation mode.
Cooling: Outside temperature is high or high pressure is high.
3) The table below summarizes the factory settings for dipswitches SW5-1 through SW5-4, and SW5-7. The factory setting for
all other dipswitches is OFF.
SW 5
model
12347
ON ON OFF OFF ON P250YHM model
(2) INV board
Functions are switched with the following connector.
Connector Function
Function according to connec-
tor
Setting timing
Enabled Disabled Enabled Disabled
CN6 shortcircuit con-
nector
Enabling/disabling the following error
detection functions;
ACCT sensor failure
(5301 Detail No. 115)
ACCT sensor circuit failure
Error detection enabled
Error detection disable
(No load operation is possible.)
Anytime after power on
(5301 Detail No.117)
IPM open/ACCT erroneous wiring
(5301 Detail No. 119)
Detection of ACCT erroneous wiring
(5301 Detail No.120)
CN6 short-circuit connector is mated with the mating connector.
Leave the short-circuit connector on the mating connector during normal operation to enable error detection and protect the
equipment from damage.
HWE07190 GB
- 75 -
Page 85
[ VII Control ]
2. Function of the switch (Indoor unit)
(1) Dipswitches
1) SW1,3
Switch Function
SW1
SW3
SW7
Note 1. Setting timing for DIPSW 1 and 3 is during unit stoppage (remote controller OFF). It is not necessary to reset the settings by power-off.
Note 2. Settings in the shaded areas are factory settings.
2) SW2,SW3-2,SW4
1
2
3
-
Clogged filter detection
Filter check reminder
time setting
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
-
Remote display option
---
---
-
External input
Operation switching
Model setting
Capacity code
---
---
---
---
LEV setting conversion
function
---
---
---
Reset of the integrated
operation time
1
Valid/Invalid (fan belt)
Reset of the integrated
operation time
2
Valid/Invalid (fan motor)
3
4
---
---
Function according to switch setting
OFF ON
--
Not available
100h
Available
2500h
--
Fan output
Thermo-ON signal
--
Level
External input
Heat pump
Pulse
MA remote controller
Cooling-only
Refer to the combination with SW2
Not available Available
Not available Available
Not available Available
Switch setting timing
OFF ON
While the unit is stopped
(Remote controller OFF)
Notes
*
Capacity code
50 OFF
50
SW3-2
OFF
Model System
P250
One-refrigerant circuit connection
P500
Two-refrigerant circuit connection
* The setting is changed at site under two-refrigerant circuit connection
<Capacity code and function setting>
If the capacity code or the model setting is changed upon replacement of the circuit board, power reset the indoor and outdoor units.
HWE07190 GB
SW2 SW4
123456
ON
OFF
123456 12345
ON
OFF
ON
OFF
ON
OFF
- 76 -
12345
Page 86
[ VII Control ]
3) SW5
Function
Reset of the integrated
operation time
Operation by switch setting
Resetting the integrated operation time
according to the setting of SW7-1 and 7-2
During unit stoppage (remote controller OFF)
(when switching from OFF to ON)
Switch setting timing
4) SW8
Function Operation by switch setting
Compulsory thermo OFF setting during test run
(used in the grouped indoor units connected to
different outdoor units)
ON
OFF
ON
OFF
1
23
Normal control
123
Compulsory thermo OFF
Switch setting timing
Anytime
after power on
(2) Slide switches
Switch Function Operation by switch setting
Input setting
Suction temperature control
Discharge temperature control
SWC 1~2
Switching between
suction/discharge temperature
control
Option
Standard
Option
*
Standard
Switch setting timing
Anytime
after power on
* The settings for the two circuit boards must be equivalent to switch between suction/discharge temperature control under
two-refrigerant circuit system.
3. Function of the switch <Remote controller>
(1) MA remote controller (PAR-20MAA)
The SW is located at the bottom of the remote controller under the cover. Operate the switches to perform the remote controller main/sub setting or other function settings. Normally, do not change the settings of switches other than the SW1 (main/
sub switching switch). (All the switches are set to "ON" at factory setting.)
Switch
Remote controller
1
main/sub setting
At power on of the
2
remote controller
Cooling/heating display
3
set by automatic setting
Suction temperature display
4
(discharge temperature display)
Function
1ON234
ON OFF
Main Sub
Normal
startup
Displayed Not displayed
Displayed Not displayed
Timer mode
startup
Remote controllerSwitching switch
Operation by switch settings
When two remote controllers are connected
to one group, set either of the remote
controllers to "Sub".
To resume the operation with timer mode
after the power is restored when the
schedule timer is connected, set to
"Timer mode startup".
When the automatic mode is set and the
"Cooling"/"Heating" display is not necessary,
set to "Not displayed".
When the suction temperature (discharge
temperature) display is not necessary,
set to "Not displayed".
Switch setting timing
Before power on
Before power on
Before power on
Before power on
HWE07190 GB
- 77 -
Page 87
[ VII Control ]
[2] Controlling the Outdoor Unit
-1- Initial Control
When the power is turned on, the initial processing of the microcomputer is given top priority.
During the initial processing, control processing of the operation signal is suspended. (The control processing is resumed after
the initial processing is completed. Initial processing involves data processing in the microcomputer and initial setting of each
of the LEV opening. This process will take up to 1 minute. This process will take approximately three minutes when it is performed for the first time.)
During the initial processing, the LED monitor on the outdoor unit's control board displays S/W version -> refrigerant type
-> heat pump -> cooling only and capacity -> and communication address in turn every second.
-2- Control at Start-up
The upper limit of frequency during the first 3 minutes of the operation is 50 Hz.
When the power is turned on, normal operation will start after the initial start-up mode (to be described later) has been com-
pleted (with a restriction on the frequency).
-3- Bypass Control
Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions.
(1) Bypass solenoid valve (SV1a) (ON = Open), (SV9) (ON = Open)
Operation
When starting-up the compressor of each
outdoor unit
After the restoration of thermo or 20 seconds after restart
During cooling or heating operation with the
compressor stopped
After the operation has stopped ON for 3 minutes.
During defrost operation ON
While the compressor is operating at the
minimum frequency and when the low pressure (63LS) drops (3 or more minutes after
compressor startup)
When high pressure (63HS1) rises When 63HS1 exceeds
Operation
When high pressure (63HS1) rises during
the heating operation
When startup or resuming operation after a
defrost cycle
Others Always OFF
Exception: OFF when 63HS1-63LS is 0.2 MPa [29 psi] or less
Exception: OFF when 63HS1-63LS is 0.2 MPa [29 psi] or less
When low pressure (63LS) drops
below 0.23 MPa [33 psi].
3.62 MPa [525 psi]
When 63HS1 exceeds 3.50MPa
ON OFF
ON OFF
[507psi]
ON for 5 minutes and goes OFF
SV1a
ON for 4 minutes.
ON for 4 minutes.
Always ON.
When low pressure (63LS) exceeds 0.38 MPa [55 psi].
When 63HS1 is or below
3.43 MPa [497 psi] and 30 seconds
have passed
SV9
When 63HS1 is or below 2.70Mpa
[391psi]
HWE07190 GB
- 78 -
Page 88
[ VII Control ]
-4- Compressor Frequency Control
Depending on the capacity required, the frequency of the compressor is controlled to bring the evaporation temperature (Te)
close to the target evaporation temperature (Tem) during cooling operation, and to keep constant condensing temperature
(49°C[120°F] =2.88MPa[418psi]) during heating operation.
The target evaporation temperature (Tem) varies as follows during cooling operation depending on the capacity required.
When the capacity exceeds the needs : Tem is lowered.
When lacking in capacity : Tem is raised.
Minimum and maximum Tem Valued : -10°C[14°F] Tem < 25°C[77°F]
Model
Frequency/cooling (Hz) Frequency/heating (Hz)
Max Min Max Min
250 model 87 15 95 15
(1) Pressure limit
The upper limit of high pressure (63HS1) is preset, and when it exceeds the upper limit, the frequency is decreased every 15
seconds.
The actuation pressure is when the high-pressure reading on 63HS1 is 3.58MPa[519psi].
(2) Discharge temperature limit
Discharge temperature (TH4) of the compressor in operation is monitored, and when it exceeds the upper limit, the frequency
is decreased every minute.
Operating temperature is 115°C [239°F].
(3) Periodic frequency control
Frequency control other than the ones performed at start-up, upon status change, and for protection is called periodic frequency control (convergent control) and is performed in the following manner.
Periodic control cycle
Periodic control is performed after the following time has passed
30 seconds after either compressor start-up or the completion of defrost operation
30 seconds after frequency control based on discharge temperature or pressure limit
The amount of frequency change
The amount of frequency change is controlled to approximate the target value based on the evaporation temperature (Te) and
condensing temperature (Tc).
HWE07190 GB
- 79 -
Page 89
[ VII Control ]
-5- Defrost Operation Control
(1) Starting the defrost operation
The defrost cycle starts when the pipe temperature (TH3) at or below the value in the table below has continuously been de-
tected for three minutes after the cumulative compressor operation time of 50 minutes have passed (90 minutes when the
defrost prohibit timer is set to 90 minutes.).
If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation
will start by turning on the forced defrost switch (DIP SW2-7).
Even if the defrost prohibit timer is set to 90 minutes, the actual defrost prohibit time for the next operation will be 50 minutes
if defrosting took 12 minutes.
In the multiple-outdoor-unit system, all of the outdoor units that are in operation go into the defrost mode simultaneously. The
unit(s) that is stopped at the time defrost operation starts remains stopped.
Model
250 model - 10°C [14°F] - 5°C [23°F]
(2) Defrost operation
Compressor frequency Model Compressor frequency
Outdoor unit fan Stopped
SV1a ON
SV5b ON
21S4a OFF
21S4b OFF
SV9 OFF
LEV1 480 pulses
LEV2a 1400 pulses
LEV2b 1400 pulses
TH3
SW3 - 3 OFF SW3 - 3 ON
250 model 98 Hz
(3) Stopping the defrost operation
The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperature (TH3),
in the following table, or above has been continuously detected for 4 minutes.
Defrost operation will not stop its operation for 2 minutes once started unless the piping temperature exceeds 25°C [77°F]
within 2 minutes, in which case the operation will stop.
In the multiple-outdoor-unit system, defrosting is stopped on all units at the same time.
TH3
Model
SW3 - 3 OFF SW3 - 3 ON
250 model 10°C [50°F] 15°C [59°F]
(4) Problems during defrost operation
If a problem is detected during defrost operation, the operation will be stopped, and the defrost prohibition time based on the
integrated compressor operation time will be set to 20 minutes.
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-6- Refrigerant Recovery Control
Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while
it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also
performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat exchanger.
It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor
heat exchanger.
(1) During heating operation
Starting refrigerant recovery mode
The refrigerant recovery mode in heating starts when all of the following three conditions are met:
15 minutes have passed since the completion of previous refrigerant recovery.
TH4 > 115°C [239°F]
Frequencies below 50 Hz
Refrigerant recovery
1) Refrigerant is recovered with the LEV on the applicable indoor unit (unit under stopping mode, fan mode, cooling, heating with
thermo off) being opened for 30 seconds.
Opening of LEV during refrigerant recovery
Opening of indoor unit LEV: 400 pulses
Initial opening of LEV
Start
30 seconds
Finish
2) Periodic capacity control of the outdoor units and periodic LEV control of the indoor units will be suspended during refrigerant
recovery operation; they will be performed after the recovery has been completed.
(2) During cooling operation
Starting refrigerant recovery mode
The refrigerant recovery mode starts when all the following conditions are met:
30 minutes have passed since the completion of previous refrigerant recovery.
When the unit keeps running for 3 minutes in a row or more with high discharge temperature
TH4 > 105°C [221°F] or 63HS1 > 3.43 MPa [497 psi] (35 kg/cm
2
G) and SC0 > 10°C [18°F]
Refrigerant recovery
The opening of LEV1 is increased and periodic control begins again.
-7- Capacity Control of Outdoor Fan
(1) Control method
Depending on the capacity required, the rotation speed of the outdoor unit fan is controlled by the inverter to keep based on
the evaporating temperature during cooling operation and condensing temperature during heating operation.
(2) Control
Outdoor unit fan stops while the compressor is stopped (except in the presence of input from snow sensor).
The fan operates at full speed for 5 seconds after start-up.(Only when TH7<0°C [32°F])
The outdoor unit fan stops during defrost operation.
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[ VII .Control ]
-8- Subcool Coil Control (Linear Expansion Valve <LEV1>)
The LEV opening is adjusted every 30 seconds to keep constant either the amount of subcool at the outdoor unit heat ex-
changer outlet, which is calculated based on the high pressure (63HS1) and liquid pipe temperature (TH3) or the amount of
superheat, which is calculated based on the low pressure (63LS) and bypass outlet temperature (TH2) of the subcool coil.
Valve opening is corrected based on the subcool coil inlet/outlet temperature (TH3, TH6), high pressure (63HS1), and dis-
charge temperature (TH4). The valve is at the closed position (0) during heating operation, while the compressor is stopped,
and during Cooling Thermo-OFF.
The valve remains open at the preset position (480 pulses) during the defrost cycle.
-9- Refrigerant flow control (Linear expansion valve <LEV2a, LEV2b>)
These valves control the refrigerant flow during heating operation. They remain open at the preset position (1400 pulses) dur-
ing cooling operation.
Valve opening is controlled based on the values of high pressure (63HS1), discharge temperature (TH4), low pressure(
63LS), and piping temperature (TH5).
The valve moves to the predetermined position while the unit is stopped.
The valve remains open at the preset position. (1400 pulses)
-10- Control at Initial Start-up
When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode.
1. Flowchart of initial operation
Initial startup mode starts.
50 F 60Hz
Completed in the integrated operation time of 30 minutes.
F < 50Hz
Completed in the integrated operation time of 90 minutes.
Initial startup mode complete
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-11- Emergency Operation Mode
Backup mode is a mode in which the unit is operated when the thermistor malfunctions. The unit automatically goes into the
backup mode when the following error is detected.
(1) Starting the emergency operation
1) When an error occurs, the error source and the error code will be displayed on the display on the remote controller.
2) When the error type displayed in 1 above allows the unit to run the emergency operation (as shown in the table below), the
retry operation will start automatically.
Pattern of
emergency
operation
mode
Error
source
Type of error that allows the unit to go
into the emergency operation
Type of error
that does not al-
low the unit to
go into the
Operation
emergency op-
eration
Thermistor
error
TH2
TH3
TH5
TH6
5102
5103
5105
5106
Sensor values are interpolated
and the unit goes into the backup mode based on its result.
(2) Ending the emergency operation
1) End conditions
When one of the following conditions is met, emergency operation will end.
When an error is reset
*When resetting an error with the remote controller or the external input
When an error is detected that does not allow the unit to run the emergency operation.
(3) Miscellaneous
1) End conditions
When encountering problems other than the ones listed above, the system makes an error stop without performing emergen-
cy operation. (Only the indoor fan operates unless problems are found with the fan.)
When problems are found in only one of the two units of a 2-refrigerant circuit, only the unit with the problems will run an
emergency operation or stop its operation, and the other unit will keep running its operation.
Emergency operation is intended only as a first aid until the unit is serviced. Have the unit serviced without delay to restore a
normal operation.
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[ VII Control ]
-12- Capacity Control between Outdoor Units (when two refrigerant circuits are connected)
The following two capacity control methods between indoor units are available.
Control to make only one of the outdoor units (which has the smaller address) operate and keep running during low-load hours
at startup.
Control to make one of the outdoor units stop, and the other outdoor unit operate when the load becomes low during normal
operation. After a certain period of time has passed since only one of the outdoor units started operation, the unit in operation
stops, and the other outdoor unit starts operation automatically.
(1) Starting Conditions
Air conditioning load that is calculated based on the return air temperature is 50% or above.
Operation frequencies of both indoor and outdoor units remain near the minimum level three minutes after start-up.
(2) Stopping Conditions
When operation frequency of the running unit rises up near the maximum capacity.
When it is determined that the load is over 50%, using suction temperature as a reference.
When compressor stops while running only one unit.
-13- Dehumidification priority control
The dehumidification priority control is the control to increase the amount of dehumidification by increasing the frequency of
the compressor when the external signal (dehumidification command) is received during cooling operation.
During dehumidification priority control, the room temperature may drop below the preset temperature set during normal operation.
Under this control, the set temperature wil be compulsory at the minimum value.
(Under discharge temperature control:14°C[57°F] Under suction temperature conrol:19°C[66°F])
The temperature nor the humidity can be controlled simultaneously as the reheat function is not available.
-14- Operation Mode
(1) Indoor unit operation mode
The operation mode can be selected from the following 4 modes using the remote controller.
1 Cooling mode
2 Heating mode
3Fan mode
4 Stopping mode
(2) Outdoor unit operation mode
1 Cooling mode All indoor units in operation are in cooling mode.
2 Heating mode All indoor units in operation are in heating mode.
3 Stopping mode All indoor units are in fan mode or stopping mode.
The heating mode can be used for standby of the indoor unit when the outdoor temperature is low. Confirm that the devices
to be cooled are not influenced by the heat.
The discharge temperature control cannot be used.
The discharge temperature is controlled not to drop less or equal 30°C[86°F]. It may take time to reach the indoor target temperature.
When the indoor temperature reaches the cooling operation range, switch the operation from heating to cooling.
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[ VII Control ]
-15- DEMAND Control
Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units.
When DIP SW4-4 is set to ON, the 4-step DEMAND control is enabled.
Refer to Chapter II [3] 2. (7) "Various types of control using input-output signal connector on the outdoor unit (various connection options)" for details.(page 21)
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[ VII Control ]
-16- System Rotation Control Instructions
1. General Descriptions
Each group can consist of a maximum of 5 systems and a minimum of 2 systems.
With the use of this control function, one system in a given group serves as a backup and remains stopped.
The unit designated as the control unit (System 1 in Figure 1) sends command signals to other units in the group to start or
stop, and rotates the backup unit every 480 hours.
Rotation sequence is in the ascending order of address, starting from the lowest address after the control unit address.
(e.g., System 2 -> System 3 -> System 4 -> System 5 -> System 1 in Figure 1 below)
If other units in the group detect an error or if there is a communication failure between the systems, this control is terminated,
and the backup unit goes into operation.
CAUTION
To enable this control function, the following wiring and settings are required at installation.
1) Daisy-chain terminals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on all
applicable outdoor units.
Move the power jumper connected to CN41 to CN40 on only one of the outdoor units.
To supply power to the outdoor unit from a power supply unit, leave the power jumper connected to CN41as it
is (factory setting).
2) Check that the label on the indoor unit circuit board reads KE90D352, if it does not, replace the circuit board.
3) Set the SW1-9 and SW1-10 on indoor units as follows to enable the external input: (SW1-9: ON; SW1-10: OFF).
4) Assign sequential addresses to the units as shown below (Figure 1 and 2).
(Only use odd numbers for the 10HP system.)
5) Make the rotation group settings by setting the appropriate switches on the outdoor units.
<Refer to Item 2 below.>
TB7
OC51
TB3
TB5
IC01
TB15
MA
System 1
(Control unit)
TB3
TB5
TB15
TB7
OC51
IC01
OC52
TB3
TB5
IC02
TB7
TB15
OC53
IC03
MA
System 2
Backup unit
OC53
IC03
OC54
IC04
OC55
IC05
MA
OC56
IC06
System 3
Figure 1 Sample 20HP system group
TB7
OC55
TB3
TB5
TB15
IC05
OC57
IC07
MA
System 4
OC57
IC07
OC58
IC08
OC59
IC09
MA
OC60
IC10
System 5
OC59
IC09
MA
System 1
(Control unit)
MA
System 2
Backup unit
MA
System 3
MA
System 4
MA
System 5
Figure 2 Sample 10HP system group
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[ VII Control ]
(1) Rotation Group Setting
Group setting is required to enable the system rotation control function.
Group setting must be made after the setup sequence for all applicable indoor and outdoor units have been completed.
By turning the Dip SW5-10 from OFF to ON on the outdoor unit with the lowest odd number address in a given group while
the unit is stopped, this unit is designated as the control unit.
The control unit sends signals to other units with the addresses that equals "the control unit address + 2, +4, +6, +8" in this
order and includes the units that returned the response signal in the group.
If there is a unit that does not return a response signal or if a response is returned that indicates another unit is designated as
a control unit, communication and group setting will be completed.
Group setting pattern will fall into one of the following 9 patterns as shown in Figure 3. In patterns 5 and 9, only the control
unit will be designated, but this function will not be used.
In patterns 6 through 9, the second CU and on will be in another group.
Outdoor unit addresses
A
A+2 A+4 A+6 A+8
Pattern 1 CU
Pattern 2 CU
Pattern 3 CU
Pattern 4 CU
Pattern 5 CU
Pattern 6 CU CU
Pattern 7 CU CU
Pattern 8 CU CU
Pattern 9 CU CU
A: Odd numbers between 51 and 91
CU: Control unit : Response returned : No response : Optional
Figure 3 Group patterns
(2) Starting Conditions
This control function is initiated after group settings have been made and if all of the following conditions are met.
Initial setup sequence for all the units in the group has been completed.
All the units in the group are in operation.
No errors are detected by any unit in the group.
(3) Rotation Operation
When the above starting conditions are met, the control unit will bring the backup unit to stop, and the system rotation timer
starts counting.
When the system rotation timer reaches 480 hours, units are rotated to become the backup unit.
When rotation is performed, first the stopped backup unit is started, then the system rotation timer is reset, and finally the next
backup unit is brought to stop in three minutes or less.
The address of the unit that is currently designated as the backup unit can be found by setting Dip SW1 on the outdoor unit
that is designated as the control unit as shown below.
SW1
ON
987654321 10
(4) End Conditions
This control function is terminated by turning the Dip SW 5-10 from ON to OFF on the control unit (outdoor unit) while the unit
is stopped.
When this function is disabled, the group setting information and the system rotation timer on the control unit will be cleared.
If any backup unit other than the control unit is stopped as a backup unit, that unit will automatically resume its operation.
(5) Running/Stopping the Units on Rotation
Indoor units whose SW9 (Normal/Local switching switch) is set to "Local" will not be able to accept the Run/Stop signal from
the control unit and will not operate properly. After the unit whose SW9 is set to "Local" is operated or stopped from the MA
remote controller, the operation status needs to be changed back to the original status, and the SW9 setting needs to be set
back to "Normal."
If an attempt is made to Run/Stop the indoor unit whose SW9 is set to "Normal", the following types of errors may happen.
Example 1 Backup units are not rotated when the system rotation timer has reached 480 hours.
Example 2 The backup unit does not go into operation when a unit in the group detects an error.
These symptoms can be solved by bringing the stopped unit into operation. By doing so, although all the units will temporarily
operate, the rotation function will remain effective.
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(6) When an Error Occurs
If an error is detected by a unit or a communication failure between the systems in the group while the rotation function is
enabled, the units will perform the actions as described in Table 1, and the rotation control will be temporarily stopped.
When the starting conditions are met, this function will be resumed, and the rotation sequence and the system rotation timer
count effective at the time of error will be kept.
Table.1 Operation of Units during an Error
Rotation status A unit in the group made an abnor-
mal stop.
Communication failure between
systems
Control unit Backup unit Goes into operation Goes into operation
Regular unit Sends a startup signal to the back-
up unit
Other units Backup unit Goes into operation by receiving a
signal from the control unit
Sends a startup signal to the backup unit
1) Goes into operation by receiving a signal from the control unit
2) Goes into operation
*1
Regular unit Sends its own error status to the
control unit
-
*1. The backup unit will automatically resume its operation when periodical communication from the control unit is lost.
(7) Rotation Function Test Run Mode
Proper operation of the rotation function can be checked in a short time using the rotation function test run mode.
Rotation function test run mode can be initiated by starting the control unit in the test run mode (via MA remote controller).
In this mode, the system rotation timer setting is reduced to approximately three minutes (from the usual 480 hours), and the
test run will automatically end when the control unit is rotated to the backup unit.
At the completion of the test run mode, the system rotation timer setting goes back to 480 hours, and this function will remain
effective.
Important Notes on Rotation Control
All the units in the system using the rotation function must be the same capacity and installed within the same area to be
cooled.
Check that the items to be cooled are not affected no matter which unit stops when designated as a backup unit.
The backup unit automatically goes into operation only when there is a problem with other units in the group. It will not auto-
matically go into operation even if the heat load increases.
The control unit cannot perform a test run while the system rotation function is performed. Disable the system rotation control
function to perform a test run.
If multiple units are grouped with an MA remote controller or a G-50A controller, this control function will not work properly.
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[3] Controlling the Indoor Unit
<Indoor unit control>
There are two controller circuit boards with two refrigerant circuits inside the indoor unit of 20 HP.
There is one controller circuit board with one refrigerant circuit. Each refrigerant circuit is controlled independently
(in case of one refrigerant circuit, one-to-one control of indoor unit and outdoor unit) in the following method.
-1- Thermostat Functions
(1) Thermostat Functions and Function Selection
·Two control methods are available; suction temperature control and discharge temperature control.
·The suction/discharge temperature control can be switched by the switches (SWC) on the controller circuit board
inside the controller of the indoor unit.
·The discharge temperature control is selected (SWC is set to "Standard") at factory shipment.
·To switch the control, set SWC on two controller circuit boards inside the controller as follows.
To perform suction temperature control: Set SWC to "Option".
To perform discharge temperature control: Set SWC to "Standard".
·The SWC settings made on two controller circuit boards must be equivalent.<20HP only>
*Only the suction temperature control is performed in the heating mode regardless of the SWC settings.
(2) Thermostat Reading
A. Discharge temperature control (SWC is set to "Standard".)
(a) Thermo ON Condition
· Three minutes have past since thermo OFF AND
· TH24 - Preset temperature > 1 C [34 F]
· The TH21 value has gone up by 1 C or more compared to its value during Thermo-OFF.
TH24: Discharge thermistor
TH21: Suction thermistor
(b) Thermo OFF Condition
< When Dipsw4-5 on the outdoor unit is ON >
· 30 minutes have past since thermo ON AND
· TH24 - Target Temperature < -1 C [30 F] has been detected fo r 10 minutes
OR TH24 - Target Temperature < -5 C [23 F] was detected
< When Dipsw4-5 on the outdoor unit is OFF >
· Two minutes have past since thermo ON
· TH24 - Target Temperature < -1 C [30 F] has been detected for 5 minute AND F=Fmin.
B. Suction Temperature Control (SWC is set to "Option".)
(a) Thermo ON Condition
· Three minutes have past since thermo OFF AND
· TH21 - Target Temperature > 1 C [34 F]
(b) Thermo OFF Condition
<
When Dipsw4-5 on the outdoor unit is ON >
· Thirty minutes have past since thermo ON AND
· TH21 - Target Temperature < -1 C [30 F] has been detected for 10 minutes
OR TH21 - Target
<
When Dipsw4-5 on the outdoor unit is OFF >
· Two minutes have past since thermo ON AND
· TH21 - Target Temperature < -1 C [30 F] has been detected for 5 minute AND F=Fmin.
Temperature < -5 C [23 F] was detected.
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-2- Actuator Control
(1) LEV Control
· At startup, the LEV is set to the initial position based on the outside temperature.
· After the start-up, the degree of LEV opening is controlled every minute so that the superheat detected by
the thermistors TH22 (liquid pipe) and TH23 (gas pipe) of the indoor unit can be within a certain range.
· Depending on the operating condition of the outdoor unit, a control other than the superheat control described
above may be performed.
· The degree of LEV full opening/closing is 41 pulses.
(2) Fan Control
Whether the thermostat is ON or OFF, the fan stays ON except during operation stoppage.
Exception: Fan stops when problem with the fan is detected (Error Code 4109).
* Fan problems may be experienced in the following situations: Surge breaker trip (51F) or malfunctions
of sub relays (Z1, Z2, or Z3.)
(3) Float Switch Control
The unit makes an error stop when the contact point (B contact) of the float switch loses its contact
(i.e. loosened floated parts, disconnected wire, unfastened connector etc.) for more than 1 minute or longer.
(4) Indicator Lamp
Indicator lamps on the front side of the unit indicate the operation status of the indoor unit.
Power Supply Lamp (White) : Lit upon power ON. Extinguished upon power OFF.
Operation Lamp (Green) : Lit during operation. Extinguished during stoppage.
Error
Lamp (Red) : Lit when errors are detected in each refrigerant circuit. Extinguished during
Inspection lamp (orange)
-3- Temperature Setting Range
The temperature range can be set between 19 C [66 F] (14 C [57 F]) and 30 C [86 F] using the remote controller when
the suction temperature control (or the discharge temperature control) is performed.
* Depending on the operating conditions, target temperature and actual discharge/suction temperatures may
not match.For example, even if the target discharge temperature is set at 14 C [57 F], if the load exceeds the
capability of the unit, the actual temperature will not reach 14 C [57 F]
normal operation or after error reset.
: Lit when the inspection switch of the indoor unit is ON (during inspection).
Extinguished when the switch is OFF (during normal operation).
-4- Emergency Operation Mode
The emergency operation is an operation that operates the unit temporarily depending on the error types
described later. The emergency operation is run automatically when the following errors are detected.
(1) Starting an Emergency Operation
When the following problems are detected, the system runs an emergency operation, displaying error codes.
During this operation, near normal operation is run, ignoring the following abnormal operation data. (Some
of the actuator will run at a fixed state during this time.)
Chart: Types of errors in which emergency operation can be run
Error codesTypes of Errors
Thermistor Error Open/Short Detection 5101
(2) Stopping the Emergency Operation
Emergency operation mode is stopped in the following situations:
When
abnormal mode is reset
*How
to reset an abnormal mode
· When the operation is stopped by the remote controller or by the external input
A different type of error is detected during emergency operation
* i.e. when TH22 error is detected during emergency operation caused by TH21 error
When emergency operation disabled error is detected
TH21
TH22
TH23
TH24
5102
5103
5104
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[ VII Control ]
(3) Miscellaneous
When the errors other than described in the chart, the unit makes an error stop without performing emergency
operation. (Only the indoor fan operates, however; it stops when the fan is in trouble.)
When one of the two refrigerant circuits, the outdoor unit with the refrigerant circuit in error performs emergency
operation or makes an error stop, while the other outdoor unit keeps normal operation.
Emergency operation is intended only as a first aid until the unit is serviced. Have the unit serviced without delay to restore a normal operation.
-5- Twenty-second restart-suspension mode
The unit will be in a twenty-second restart-suspension mode (same operation as Thermo
lowing situations.
· When the demand for outdoor unit changes from Thermo ON to Thermo OFF.
· When operation mode changes from normal to emergency mode.
· When anti-freeze mode is completed.
* The outdoor unit has also a twenty-second restart-suspension mode, and it works separately from the
indoor unit.
-6- Anti-Freeze Control (In cooling mode)
(1) Starting Conditions
This operation will start when all of the following conditions are met:
· Thermo ON status has been detected for 16 minutes.
· TH22 (liquid pipe temp. Thermistor) < 1 C[34 F] has been detected for 20 minutes.
OFF) in any of the fol-
(2) Control Operation
The unit will be in the same condition as Thermo OFF condition for six minutes. When the following conditions
are met, the unit will be in a 20-second restart-suspension mode.
(3) Stopping Conditions
When either of the following conditions is met:
· TH22 10 C[50 F]
· Six minutes have elapsed since the beginning of this operation.
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