Mitsubishi PUHY-P200YREM-A, PUHY-P250YREM-A Service Manual

Service Handbook

2004

AIR CONDITIONERS CITY MULTI

HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Issued in Mar. 2004 MEE03K220
Printed in Japan

New publication, effective Mar. 2004

Specifications subject to change without notice

Service Handbook Replace Multi PUHY-P200·250YREM-A

Caution to REPLACE MULTI Installation Work

Flow of installation work in the field Items to be observed

•Please note that our Corporation is not liable to the reliability of existing piping,
wiring and power system for reuse (in relation with the gas leak of piping, partially
defective/disconnection of wiring, deteriorated insulation, characteristic faults due
to worn out system).

•For limitation on the refrigerant piping and applicable piping diameter, check the
existing piping for reuse in accordance with the specified check sheet by refer­ring products catalogs and manuals for judgement to reuse.

•If vapor condensation was found in the past, check the thermal insulation.

•For a portion suffered by condensation dripping, check the deterioration of the
insulation, and repair the insulation materials if required.

•When the copper piping is seriously deteriorated, do not use parts with verdigris
or black spots.

•For reusing the existing control wiring between the outdoor unit, and remote con­troller, check the wire type , siz e or the lik e based on the chec k sheet to judge the
possibility.

•Even when the above does not meet the item on the check sheet, existing wiring
may be reused depending on the number of connecting indoor units and piping
length. Ask us for detail.

•For the power source system, employ the voltage and number of phase meeting
the outdoor unit, indoor unit and heat storage unit, and adopt the breaker capac­ity and wiring size based on the power source wiring connection diagram.

•When the existing power source system (including the power source wiring) is
used, check the system for deterioration and damages.

•Check the refrigerating machine oil used in the existing system. (As is found at
the oil inspection, if the refrigerating machine oil used in the existing system is
mineral oil, use the ester oil sampling kit for inspection.

•When the length of piping for reuse is unknown, additional refrigerant charge is
to be calculated based on the quantity of recovered refrigerant. For this reason,
you are kindly requested to recover all refrigerant inside the existing outdoor/
indoor units and extended piping to check and record the quantity. (The stan­dard of additional refrigerant is (Quantity of R22 recovered - Charged quantity of
existing outdoor unit + 3kg). Adjust the refrigerant quantity after mineral oil re­covery operation.)

■ Outdoor unit

•Confirm the space around the outdoor unit.
(Verifying the installation space of the oil trap kit)

■ Turn the power source on, and confirm the normality of the system

•Check the remote controller or outdoor unit for error display.

•Run the indoor unit for fan operation after turning the remote controller on, and
check the air feeding and direction.

Do not run the compressor until finishing the mineral oil recovery operation.

■Mount the valve to the field piping (extended piping). (The ball valve is being
attached to the outdoor unit.)

■Execute an airtight test to check the existing piping for deterioration or leaking.

■Calculate the quantity required by the extended piping, and charge the addi-

tional refrigerant. Make sure to enter the value in the additional refrigerant charge
column on the label of combined outdoor unit being pasted on the outdoor unit.

Without applying any operation, keep the ball v alves of the outdoor unit c losed

before mineral oil recovery operation.

It is necessary to charge refrigerant in a rated quantity and adjust the quantity.
Be sure to execute when the piping length is unknown.
For detail, consult the agent of your dealer.

Enter required items in the request form of REPLACE MULTI mineral oil recovery work.

During local installation work

Before local installation work

Confirming the possibility of existing
refrigerant piping for reuse

Confirming the possibility of existing
control wiring for reuse

Confirming the possibility of existing
power source system for reuse

Confirming the objective range for
replacing

Recovering the refrigerant of old system

Removing the outdoor/indoor units, re­mote controllers, etc.

Installing the outdoor/indoor units, remote
controllers, etc., and executing electrical
work

Setting the address, checking the system

Executing the piping work (mounting of
ball valve).
Air tightening and evacuating the existing
piping and charging refrigerant

Operating mineral oil recovery

Executing test run and adjustment (for
final verification of operation).

Safety Precautions

• Before installing the unit, make sure you read all the “Safety precautions”.

• The “Saf ety precautions” provide very important points regarding safety. Make sure you f ollo w
them.

Symbols used in the text

Warning:

Describes precautions that should be observed to prevent danger of injury or death to the user.

Caution:

Describes precautions that should be observed to prevent damage to the unit.

Symbols used in the illustrations

: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Beware of electric shock (This symbol is displayed on the

main unit label.) <Color: Yellow>

Warning:

Carefully read the labels affixed to the main unit.

Warning

Ask your dealer or specialized contractor for
installation.

•If your own installation work is improper, fire, electric
shock or water leakage may result.

Connect wiring using the specified cable and fas­ten it securely to prevent the external force of
the cable from being transferred to the terminal
connecting sections.

• Improper connection or fastening may cause heat

generation or fire.

Conduct specified installation work durable
against strong winds around buildings.

•Improper installation work can cause trouble i.e. the
unit toppling over.

Never attempt to repair the unit. For repair,
ask your dealer.

•Improper repair may result in water leakage, electric
shock or fire.

Do not touch the heat exchanger fins.

•Improper handling may cause cuts.

When refrigerant gas is leaked during work,
conduct ventilation.

•If refrigerant gas comes into contact with fire, it may
cause the generation of poisonous gases.

Please conduct correct installation work by
observing this Installation Manual.

•Improper installation work may result in water leak­age, electric shock or fire.

Conduct all electrical work by a licensed en­gineer according to “Technical Standard re­lating to Electrical Facility,” “Wiring Regula­tion of Power Company,” and instructions in
this Manual, and always use an exclusive cir­cuit.

•Insufficient power source capacity or improper instal­lation may cause electric shock or fire.

When installing or moving the unit, do not
charge other than the specified refrigerant
(R407C) into the refrigeration cycle.

•Air if mixed generates abnormally high pressure in­side the refrigeration cycle which may damage the
unit.

Do not reconstruct or reset the protection
devices.

•If the protection devices like the pressure switch or
thermal switch is forcibly operated by short circuit­ing, or parts other than that specified by Mitsubishi
Electric are used, fire or explosion may be caused.

Precautions for Devices that Use R407C Refrigerant

Caution

Use refrigerant piping made of phosphorus
deoxidized copper and copper alloy seam­less pipes and tubes. In addition, be sure
that the inner and outer surfaces of the pipes
are clean and free of hazardous sulphur, ox­ides, dust/dirt, shaving particles, moisture,
or any other contaminant.

•Contaminants on the inside of the refrigerant piping
may cause the refrigerating machine oil to deterio­rate.

Store the piping to be used during installa­tion indoors and keep both ends of the pip­ing sealed until just before brazing. (Store
elbows and other joints in a plastic bag.)

•If dust, dirt, or water enters the refrigerant cycle,
deterioration of the oil and compressor trouble may result.

Use ester oil, ether oil or alkylbenzene (small
amount) as the refrigerating machine oil to
coat flares and flange connections.

•The refrigerating machine oil will degrade if it is mixed
with a large amount of mineral oil.

Use liquid refrigerant to seal the system.

•If gas refrigerant is used to seal the system, the com­position of the refrigerant in the cylinder will change
and performance may drop.

Do not use other refrigerant other than

R407C.

•Use of other refrigerants (R22 for example) may de­teriorate refrigerating machine oil due to chlorine
generation.

Use a vacuum pump with reverse flow pro­tection.

•Otherwise the vacuum pump oil will reversely flow
into the refrigerant circuit causing the possible dete­rioration of the refrigerating machine.

Do not use the following tools used for con­ventional refrigerant.
(Gauge manifold, Charging hose, Gas leak
detector, Reverse flow protector, Cap for re­frigerant charge, Refrigerant recovery de­vice)

•Mixing of conventional refrigerant /refrigerating ma­chine oil may cause to deteriorate the refrigerating
machine oil.

•Mixing with water may cause deterioration of the re­frigerating machine oil.

•As this refrigerant does not contain chloride, the gas
leak detector for conventional refrigerant gas can not
be used.

Do not use a charging cylinder.

•Use of a charging cylinder changes the composition
of refrigerant resulting in possible performance de­terioration.

More careful management is required for the
tools than that for the conventional.

•Dust, trash or water content if mixed into the refrig­erant circuit may cause to deteriorate the refrigerat­ing machine oil.

Caution to Equipment Used for Replacing

Caution

Do not operate any valves before conduct­ing mineral oil recovery operation.

Operating valves before conducting mineral oil recov­ery operation may cause a deterioration in the perfor­mance of mineral oil recovery.

For mineral oil recovery operation, the sys­tem controller and MA remote controller may
be required to be remove sometimes.

• Improper handling can lead to an inability to perform
oil recovery operation.

• For removal, follow the instruction displayed on the
PC for mineral oil recovery.

• Mount the controllers again after finishing the oil re­covery operation.

Observe a safe distance from the indoor unit
fan which runs during the mineral oil recov­ery operation.

Working in the surrounding of the indoor unit fan can
cause personal injury.

Record the quantity of refrigerant replenished.
(Enter into the column for replenished refrigerant
quantity on the label of the indoor unit.)

• Missing the description may deteriorate the perfor­mance of mineral oil recovery.

• Malfunction or poor cooling/heating may also be
caused.

During the mineral oil recovery operation, an
error display may be shown on the remote
controller or system controller.

• When an error display was shown during mineral oil
recovery operation, reset the error display after fin­ishing the operation.

To conduct the refrigerant recovery/evacua­tion of the inside of exiting piping, choose
tools only used with R407C e.g. charging hose.

• Using a charging hose for R407C causes it to mix
the conventional refrigerating machine oil leading to
the deterioration of refrigerating machine oil.

Before Conducting Installation Work/Electrical Work

Caution

Do not install the unit at a place where com­bustible gas can possibly be generated.

•Leaked combustible gas if stagnated around the unit
may cause explosion.

Do not use the unit in a special atmosphere.

•Use in an atmosphere containing high levels of oil,
steam or sulfide gas may seriously degrades the per­formance or damage parts.

Do not install the unit on a material which is
not designed to be wet.

•If liquid drips from the oil trap kit, apply centralised
drainage work to the oil trap kit.

Apply grounding work securely.

• Do not connect the grounding line to gas pipe, city

water pipe, lightning rod or telephone grounding line.
Improper grounding may cause electric shock.

For the power source wiring, refrain from
giving tensile force to the wiring.

• Disconnection, heat generation or fire may be

caused.

Make sure to mount a leak breaker to the
power source.

• Otherwise electric shock may be caused.

Be sufficiently careful in transporting products.

•Do not transport a product with a weight exceeding
20kg by a single person.

•Some products are packed with PP band. Do not
use it as a means of transporting.

•During transport cuts may be caused by the fin sur­face of the heat exchanger , please refrain from touch­ing it without gloves.

Do not use the same switch or the like for
plural outdoor units.

Otherwise, malfunction, heat generation or fire may
be caused.

When installing the unit in hospitals or com­munication equipment plants, prepare mea­sures to prevent noise generation before­hand.

•The noise may cause the erroneous operation or
failure and may giv e negative effect to medial equip­ment or communication equipment to disturb medi­cal treatment on human bodies or hinders image
broadcasting or generates noise.

Check possibility for the reuse of existing
refrigerant piping by observing this manual.

• The conventional refrigerating machine oil is con-

tained inside existing piping and some residual oil
deteriorates oil recovery performance which may
lead to the deterioration of refrigerating machine oil.

• The piping specification (diameter, length , height

difference) out of the use specified range may hinder
the mineral oil recovery performance, possibly lead­ing to deterioration of refrigerating machine oil.

Do not use breakers or fuses other than that
with correct capacities.

•Use of a fuse with excessively large capacity or wire/
copper wire may cause troubles or fire.

For the power source wiring, use wire with
rated current capacity.

• Otherwise an electric leak, heat generation or fire

may be caused.

When using existing wiring (for power source
or transmission) or switches, check them for
disconnection and deterioration beforehand.

• Otherwise an electric leak, heat generation or fire

may be caused.

Dispose the packing materials properly.

• As the packing materials are using metal products

or wooden pieces such as nails, nail wounds may
be caused if it is improperly treated. Please observe
caution to avoid this from occuring.

•Dispose the polyethylene bag for packing only after
tearing. Otherwise a suffocation accident may be
caused by children play with the disposed bag.

Be sure to mount the valve to the field piping
(extended piping).

After mineral oil recovery, the oil trap kit can not be
removed disabling air conditioning operation.

Provide thermal insulation to the valve on the
field piping (extended piping) properly.

• Insufficient thermal insulation generates condensa­tion that may cause to deteriorate the performance.

• Provide thermal insulation (including lagging) after
recovering mineral oil.

Before Conducting Mineral Oil Recovery Operation

Caution

Turn the power source on 12 hours or more
before starting operation.

• Otherwise trouble may be caused. Do not turn the
power off during the operating season.

Do not operate the unit without the panels or
guard.

• Touching the rotating parts, high temperature parts
or high voltage may cause personal injury such as
burns or electric shock.

Do not operate switches with wet fingers.

• Electric shock may be caused.

Do not turn off the power source immediately
after stopping.

• Be sure to wait for 5 minutes or more. Otherwise
water leakage or troubles may be caused.

Do not touch the refrigerant piping during
operation or immediately after stopping with
bare hands.

• The refrigerant piping or the refrigerant circuit parts
of the compressor during operation or immediately
after stopping may have low or high temperature.
Touching with bare hands may cause a burn or frost­bite.

Do not run the outdoor unit during a test run until
finishing the mineral oil recovery operation.

• The indoor unit fan will run.

Caution to Mineral Oil Recovery Operation

Warning

Caution

Be sufficiently careful to avoid the oil trap
kit, falling or toppling over.

• If this happens the oil trap kit may be damaged and
refrigerant piping may malfunction.

• Falling down during flushing operation causes the
leak of refrigerant from the joint which is dangerous
if contacts it human body.

After flushing operation, check the residual pres­sure inside the oil trap kit with a pressure gauge.
If the residual pressure is exceeding 0.294MPa,
recover refrigerant inside the oil trap kit to reduce
the pressure to within 0.2 ~ 0.294MPa.

• Under high inner pressure, pressure rises during
storing, inducing a dangerous situation.

• Under low inner pressure, water content or foreign
matter enters during storing, causing corrosion to
the oil trap kit which may cause troubles.

Be careful not to expose the oil trap kit unit
(especially electrical parts) to rain water.

• The electrical parts if wet with rain water may cause
machine trouble.

• The electrical parts if wet with rain water may cause
electrical shock.

Conduct oil recovery from the oil recovery ser­vice valve outdoor or at a place with good ventila­tion. Use leather gloves when opening the oil re­covery service valve and open it slowly.

• If done in a closed space, suffocation can be caused.

• Opening the oil recovery service valve fully and

quickly allows oil to splash, which is dangerous.

• As the oil recovered is of low temperature, frostbite
may be caused if it touches skin.

When the oil trap kit is transported while ly­ing sideways, do not place any thing on the
sheet metal of the kit.

• Otherwise, the sheet metal or inner piping may be
deformed leading to breakage.

Before removing the oil trap kit after flush­ing operation, make sure to discharge and
process the oil recovered from the oil recov­ery service valve.

• If it is not discharged, the oil accumulated inside will
flow out during flushing operation hindering proper
recovery of mineral oil thus leading to machine
trouble.

For inspection, use the ester oil sampling kit
when the refrigerating machine oil used in the
existing unit is mineral oil.

(

Confirm the type of refrigerating machine oil used in the

existing unit by reading the name plate or the like.

)

• Proper checking can not be executed if not using the
kit meeting the refrigerating machine oil used by the
existing unit. This possibly causes machine trouble.

Contents

¡ PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT ... 2

[1] Storage of Piping Material................................................................. 2

[2] Piping Machining............................................................................... 3

[3] Necessary Apparatus and Materials and Notes on Their Handling .. 4

[4] Brazing.............................................................................................. 5

[5] Airtightness Test ................................................................................ 6

[6] Vacuuming ........................................................................................ 6

[7] Charging of Refrigerant..................................................................... 7

[8] Dryer ................................................................................................. 7

™ COMPONENT OF EQUIPMENT .............................................................

8

[1] Appearance of Components ............................................................. 8

[2] Refrigerant Circuit Diagram and Thermal Sensor........................... 14

[3] Electrical Wiring Diagram................................................................ 15

[4] Standard Operation Data ................................................................ 16

[5] Function of Dip SW and Rotary SW................................................ 18

£ TEST RUN .............................................................................................21

[1] Before Test Run ..............................................................................21

[2] Test Run Method ............................................................................. 25

¢ GROUPING REGISTRATION OF INDOOR UNITS WITH REMOTE

CONTROLLER.......................................................................................

26

∞ CONTROL.............................................................................................. 32

[1] Control of Outdoor Unit ................................................................... 32

[2] Operation Flow Chart...................................................................... 37

[3] List of Major Component Functions ................................................ 42

[4] Resistance of Temperature Sensor................................................. 44

§ REFRIGERANT AMOUNT ADJUSTMENT ............................................

45

[1] Refrigerant Amount and Operating Characteristics ........................ 45

[3] Refrigerant Volume Adjustment Mode Operation ........................... 48

¶ TROUBLESHOOTING ...........................................................................

50

[1] Principal Parts................................................................................. 50

[2] Trouble and Remedy of Remote Controller.....................................

[4] Self-diagnosis and Countermeasures Depending on the Check

Code Displayed...............................................................................

62

[3] Investigation of Transmission Wave Shape/noise ..........................

69

[5] LED Monitor Display ....................................................................... 95

• PREPARATION, REPAIRS AND REFRIGERANT REFILLING WHEN

REPAIRING LEAKS .............................................................................

113

[3]

Location of leaks: Extension piping or indoor units (when cooling)113

[4] Location of leaks: Outdoor unit (when heating) ............................ 115

114

ª CHECK THE COMPOSITION OF THE REFRIGERANT

........................

116

0 CAUTIONS WHEN REPLACING THE OUTDOOR UNIT MAIN

BOARD

...................................................................................................

118

[1]

[2] Location of leaks: Outdoor unit (Cooling mode)............................ 113

Location of leaks: Extension piping or indoor units

(Heating mode)

[2] Adjustment and Judgement of Refrigerant Amount ........................ 45

72

- 1 -

[1] Storage of Piping Material

(1) Storage location

Store the pipes to be used indoors. (Warehouse at site or owner’s warehouse)
Storing them outdoors may cause dirt, waste, or water to infiltrate.

(2) Pipe sealing before storage

Both ends of the pipes should be sealed until immediately before brazing.
Wrap elbows and T’s in plastic bags for storage.

❇

The new refrigerator oil is 10 times more hygroscopic than the conventional refrigerator oil (such as Suniso). Water
infiltration in the refrigerant circuit may deteriorate the oil or cause a compressor failure. Piping materials must be
stored with more care than with the conventional refrigerant pipes.

OK

OK

NO

NO

¡ PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT

- 2 -

[2] Piping Machining

Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.

Use only the necessary minimum quantity of oil.

Reason :

1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside.

Notes :

• Introducing a great quantity of mineral oil into the refrigerant circuit may also cause a compressor failure.

• Do not use oils other than ester oil, ether oil or alkylbenzene.

- 3 -

[3] Necessary Apparatus and Materials and Notes on Their Handling

The following tools should be marked as dedicated tools for R407C.

<<Comparison of apparatus and materials used for R407C and for R22>>

Apparatus Used Use R22 R407C

Gauge manifold Evacuating, refrigerant filling Current product
Charging hose Operation check Current product
Charging cylinder Refrigerant charging Current product Do not use.
Gas leakage detector Gas leakage check Current product Shared with R134a
Refrigerant collector Refrigerant collection R22 For R407C use only
Refrigerant cylinder Refrigerant filling R22

Vacuum pump Vacuum drying Current product

Vacuum pump with a check valve Current product
Flare tool Flaring of pipes Current product
Bender Bending of pipes Current product
Application oil Applied to flared parts Current product

Torque wrench Tightening of flare nuts Current product
Pipe cutter Cutting of pipes Current product
Welder and nitrogen cylinder Welding of pipes Current product
Refrigerant charging meter Refrigerant charging Current product
Vacuum gauge Checking the vacuum degree Current product

Symbols :

To be used for R407C only. Can also be used for conventional refrigerants.

Tools for R407C must be handled with more care than those for conventional refrigerants. They must not come into contact
with any water or dirt.

Identification of dedi­cated use for R407C
:Record refrigerant

name and put brown
belt on upper part of
cylinder.

Can be used by
attaching an adapter
with a check valve.

Ester oil or Ether oil or
Alkybenzene (Small
amount)

- 4 -

[4] Brazing

No changes from the conventional method, but special care is required so that foreign matter (i.e. oxide scale, water, dirt,
etc.) does not enter the refrigerant circuit.

Example : Inner state of brazed section

When non-oxide brazing was not used When non-oxide brazing was used

Items to be strictly observed :

1. Do not conduct refrigerant piping work outdoors on a rainy day.

2. Apply non-oxide brazing.

3. Use a brazing material (BCuP-3) which requires no flux when brazing between copper pipes or between a copper pipe
and copper coupling.

4. If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends of them.

Reasons :

1. The new refrigerant oil is 10 times more hyg roscopic than the conventional oil. The probability of a machine failure if
water infiltrates is higher than with conventional refrigerant oil.

2. A flux generally contains chlorine. A residual flux in the refrigerant circuit may generate sludge.

Note :

• Commercially available antioxidants may have adverse effects on the equipment due to its residue, etc. When
applying non-oxide brazing, use nitrogen.

- 5 -

[5] Airtightness Test

No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C
leakage.

Halide torch R22 leakage detector

Items to be strictly observed :

1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment’s airtightness, taking
temperature variations into account.

2. When investigating leakage locations using a refrigerant, be sure to use R407C.

3. Ensure that R407C is in a liquid state when charging.

Reasons :

1. Use of oxygen as the pressurized gas may cause an explosion.

2. Charging with R407C gas will lead the composition of the remaining refr igerant in the cylinder to change and this
refrigerant can then not be used.

Note :

• A leakage detector for R407C is sold commercially and it should be purchased.

[6] Vacuuming

1. Vacuum pump with check valve
A vacuum pump with a check v alve is required to prevent the vacuum pump oil from flowing back into the refrigerant
circuit when the vacuum pump power is turned off (power failure).
It is also possible to attach a check valve to the actual vacuum pump afterwards.

2. Standard degree of vacuum for the vacuum pump
Use a pump which reaches 65Pa or below after 5 minutes of operation.
In addition, be sure to use a vacuum pump that has been properly maintained and oiled using the specified oil. If the
vacuum pump is not properly maintained, the degree of vacuum may be too low.

3. Required accuracy of the vacuum gauge
Use a vacuum gauge that can measure up to 650Pa. Do not use a general gauge manifold since it cannot measure a
vacuum of 650Pa.

4. Evacuating time

• Evacuate the equipment for 1 hour after 650Pa has been reached.

• After envacuating, leave the equipment for 1 hour and make sure the that vacuum is not lost.

5. Operating procedure when the vacuum pump is stopped
In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum pump side or loosen the
charge hose to drawn in air before stopping operation.
The same operating procedure should be used when using a vacuum pump with a check valve.

NO

NO

- 6 -

[7] Charging of Refrigerant

R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant.

For a cylinder with a syphon attached For a cylinder without a syphon attached

Cylinder color identification R407C-Gray Charged with liquid refrigerant

R410A-Pink

Reasons :

1. R407C is a mixture of 3 refrigerants, each with a different evaporation temperature. Therefore, if the equipment is
charged with R407C gas, then the refrigerant whose ev apor ation temperature is closest to the outside temper ature is
charged first while the rest of refrigerants remain in the cylinder.

Note :

• In the case of a cylinder with a syphon, liquid R407C is charged without turning the cylinder up side down. Check the
type of cylinder before charging.

[8] Dryer

1. Replace the dryer when the refrigerant circuit is opened (Ex. Change the compressor, full gas leakage). Be sure to
replace the dryer with a CITY MULTI (For use with R407C).

If any other product is used, the unit will be damaged.

2. Opening the refrigerant circuit after changing to a new dryer is less than 1 hour. The replacement of the dryer should
be the last operation performed.

Cylin-

der

Cylin-

der

Valve Valve

Liquid

Liquid

- 7 -

™ COMPONENT OF EQUIPMENT

[1] Appearance of Components

Outdoor unit

• PUHY-P200, 250YREM-A

Propeller fan

Accumlator

CSC

SCC

4way valve

Dryer

Compressor

Fan motor

Heat exchanger

Control box

- 8 -

Controller Box

FANCON board

ACCT

INV board

MAIN board

Noise filter

Choke coil (L2)

Terminal block TB1A Power Source

Terminal block TB7 Transmission (Centralized control)

Terminal block TB3 Transmission

Inteligent Power Module (IPM)

G/A board

DCCT

Diode stack (DS)

Magnetic contactor (52C)

Capacitor (C2, C3)
(Smoothing capacitor)

- 9 -

MAIN board

CN51
Indication distance
3-4 Compressor
ON/OFF
3-5 T roub le

CNRS3
Serial transmission to
INV board

CN3D

SW1

CNTR CNFC1

CNVCC4
Power source
for control(5V)

CN20
Power supply

3 L1
1 N

SW3

SW4

SW2 SWU2

SWU1

CNS1 CNS2 CN40 CN41 CNVCC3

Power Source
for control

1-2 30V
1-3 30V
4-6 12V
5-6 5V

CN3S

CN3N

LD1
Service LED

SWU3

CNTYP1

- 10 -

INV board

CNDR2
Out put to
G/A board

CNTH

CNCT
DCCT

CN15V2
Power supply

CNFG
Frame grounding

for IPM control

CNCT2
ACCT

CNAC2 I
Power source
1 L2
3 N
5 G

CN52AC
Control for
52C

CNRS2CN FAN

Control for MF1

Serial transmission
to MAIN board

SW1

CNVDC
1-4
DC-560V

CNVCC4
Power supply (5V)

CNL2
Choke coil

CNVCC2
Power supply

1-2 30V, 1-3 30V
4-6 12V, 5-6 5V

- 11 -

FANCON board

CNFAN

CNPOW

CNFC2

CN15V1

CNDR1

CNIPM1

G/A board

Terminal for
signal grounding

CNDC1 CNDC2

- 12 -

- 13 -

RELAY 10 board

RELAY 4 board

SLEV

ST2

TH5

SCC

TH8

ST7

ST4

LEV1

TH7

TH1

TH6

21S4

ST1

CJ1

O/S

63HS

Com

CJ2

CV1

ST3

SV1

CP1

ST5

S

M

63LS

63H

TH2

Dryer

CP2

ST10

SV4

ST9

HEX 1

ST11

HEX 2

SV2

ST6

BV3

CP3

SV3

ST8

BV1

BV2

[2] Refrigerant Circuit Diagram and Thermal Sensor

1PUHY-P200/250YREM-A

- 14 -

p

A

A

[3]

1 PUHY-P200·250YREM-A

Electrical Wiring Diagram

<SYMBOL EXPLANATION>

Symbol

DCL

ACCT-U,W

52C

ZNR4 Varistor

DC reactor (Power factor improvement)

Current Sensor

Magnetic contactor (Inverter main circuit)

N a m e

Fan motor (Radiator panel)MF1

Solenoid valve (Discharge--suction bypass)SV1, SV2

4--way valve

21S4

✻1

Symbol

SLEV

SV3

Solenoid valve
(Heat exchanger capacity control)

SV4

Solenoid valve
(Heat exchanger capacity control)

LEV1

Electric expansion valve
(Sub-cool coil bypass)

N a m e

Choke coil (Transmission)L2

IPM Intelligent power module

TH5

TH2

TH1

N a m eSymbol

OA temp. detect

Pipe temp. detect

TH6

Saturation evapo. temp. detect

Discharge pipe temp. detect

Thermistor

Thermistor

bypass outlet temp. detect
at Sub--cool coil

TH8

Symbol N a m e

THHS Radiator panel temp. detect

Aux. relayX1~10
Earth terminal

DCCT

Current Sensor

Electric expansion valve
(Sub-cool coil bypass)

63HS High pressure sensor
63LS Low pressure sensor

liquid outlet temp. detect
at Sub--cool coil

TH7

R20

CNTYP1

(2P)

C4

BOX BODY

F01 250VAC 6.3AF

F03 250VAC 6.3AF
F02 250VAC 6.3AF

52C

ACCT

-U

BOX BODY

N

BOX BODY

BOX BODY

CNPOW

(5P)

SV3

SV4

circuit

detection

1

2

3

4

5

6

NF

TB1B

BOX BODY

X10

21S4

63H

X06

CN36
(6P)

CNFC1

(6P)

CNFC2

(6P)

CNFAN

(5P)

Control circuit board

(MAIN board)

Blue

Red

White

Black

Brown

Red

BOX BODY

Power circuit board
(INV board)

L2

MF1

THHS

CNVCC3

(6P)

CNVCC4

(2P)

X10

X01

X02

23

Black

Red

V

W

U

White

CNTR1

R3

R2

C3

C2

DCL

52C

C1

ZNR4

~

~

~

TB7

M2

M1

TB3

Blue

Black

Red

White

PE

L2

TB1A

CH1

SV1

L3

N

12V

CN51

(5P)

1

5

2
4

3

PE

1

L1

M1

S

Yellow

Orange

Purple

Black

White

Gray

1
2
3
4

V
W

N

U

MF

51234

P

N

L1 L2 L3

IPM

Orange

Brown

CN04

MC1

DCCT

DC-DC
Converter

CN3S

(3P)

CN3N

(3P)

SNOW

OFF

ON

1-2

CN3N

OFF

ON

1-3
ON

OFF

Mode

Auto

changeover

Normal

HEAT
COOL

✻

1

SV2

CN02

(8P)

321

TH6

63LS63HS

Red

White

Black

TH2

TH1

TH7TH5

LEV1

TH8

SLEV

no fuse breaker

Inverter
Controller Box

PUHY-P200YREM-A
PUHY-P250YREM-A

30A
30A

3216548721321321321543215421

CN03

(3P)

CN01

(2P)

CNH
(3P)

CNL
(3P)

CNLV1

(5P)

CNSLV

(5P)

Refer to the service handbook
about the switch operations.

Crank case heater
(Compressor)

High pressure
switch

1
2
3

CN38

(3P)

6
5
4
3
2
1

6
5
4
3
2
1

X03

X04
X05

X01

X02

CN32
(3P)

CN33
(3P)

CN34
(6P)

M2

Connect to
Indoor and
remote
controller

L2

L3

N

L1

Green/
Yellow

L2

L3

N

L1

L2

L3

N

L1

Blue

Black

Red

White

L2

L3

N

L1

Blue

Black

Red

DS

White

Power source
3N~
380/400/415V
50/60Hz

Terminal
Block

Noise
Filer

Terminal
Block

L1 L2 L3 N

Diode
stack

R1 R5

3214

3214

3
2

1

4

321476589

CNS2

(3P)

CNS1

(2P)

CN20

(3P)

32121

321321

CNTR

(3P)

F1
250VAC
2A T

F3
250VAC
1A F

T01

CNDC2

(4P)

UVW

Gate amp board
(G/A board)

ACCT

-W

Motor
(Compressor)

321654879 321654879

10 1211 13 14

3214321432 145

123123

Red

White

Black

1

2

3

4

5

6

5

4

3

2

1

4

3

2

1

Fan motor
(Heat exchanger)

Fan control board
(Fancon board)

CN3D

(3P)

1

2

3

1

2

3

1

2

3

Compressor

ON/OFF

NIGHT MODE

ORDEMEND

5: Trouble

4: Compressor ON/OFF

F02
700VDC
2A T

F01
250VAC
2A T

CNDR2

(9P)

CNVDC

(4P)

CNCT

(4P)

CNAC2I

(5P)

CNRS2

(7P)

CNVCC2

(6P)

CN15V2

(14P)

CNCT2

(4P)

1
2
3

1

5
6

2
4

3

1

5
6

2
4

3

1
2
3

1
2

1
2

1

5
6
7

2
4

3

1

5
6
7

2
4

3

CNRS3

(7P)

CNVCC4

(2P)

CNX10

(3P)

CN15V1

(14P)

CNDR1

(9P)

CNDC1

(4P)

321476589

121110 13 14

3
2
1

3
2
1

CN52CAC

(3P)

CNFAN

(3P)

CNTH

(2P)

CNL2

(2P)

2121

CNFG

(2P)

21

- 15 -

• Cooling
Outdoor unit

Items

PUHY-P200YREM-A

PUHY-P250YREM-A

Indoor
Outdoor
Quantity
Quantity in operation
Model
Main pipe
Branch pipe
Total piping length

27.0/19.0 27.0/19.0

35.0/24.0 35.0/24.0
4
4

4
4

71 63 50 20 100 71 63 20

55

10 10 10 10 10 10 10 10

45 45

Hi Hi Hi Hi Hi Hi Hi Hi

11.7 11.7

270 420 360 250 360 270 420 250

122
200

1
272

50

2.00/0.55 2.08/0.54

81 80
42 44
16 16
17 17
20 20

55
44 44
20 22
13 13
20 20
14 14

0.23 0.23

10.6 9.7 14.4 13.2
380 415 380 415

Indoor unit fan notch
Refrigerant volume
Total current
Volts
Indoor unit
SC (LEV1)
Oil back (SLEV)

High pressure/Low pressure (after O/S)
(before Accumulator)

Pressure

DB/WB

Set

–

m

–

kg

A
V

Pulse

MPa

˚C

Condition

Sectional temperature

Outdoor unit

LEV opening

Inlet
Outlet

Outdoor
unit

Indoor
unit

OC

Ambient temp.

Indoor unit

Piping

Discharge (TH1)
Heat exchanger outlet (TH5)

Accumulator

Suction (Comp)
CS circuit (TH2)
Shell bottom (Comp)
SCC outlet (TH7)
Bypass outlet (TH8)
LEV inlet
Heat exchanger outlet

[4] Standard Operating Data

1 PUHY-P200·250YREM-A

- 16 -

Outdoor unit

Items

PUHY-P200YREM-A PUHY-P250YREM-A

Indoor
Outdoor
Quantity
Quantity in operation
Model
Main pipe
Branch pipe
Total piping length

20.0/– 20.0/–

7.0/6.0 7.0/6.0
44
44

55

71 63 50 20 100 71 63 20

10 10 10 10 10 10 10 10

45 45

Hi Hi Hi Hi Hi Hi Hi Hi

11.7 11.7

290 470 410 250 330 290 470 250

0

123

0

200

2.10/0.43 2.10/0.38

73 80

0 –2
20
20

42
–4 –6
33 33

34 34

60 60

0.28 0.28

11.4 10.5 15.1 13.8
380 415 380 415

Indoor unit fan notch
Refrigerant volume
Total current
V

olts
Indoor unit
SC (LEV1)
Oil back (SLEV)

High pressure/Low pressure (after O/S)
(before Accumulator)

Pressure

DB/WB

Set

–

m

–

kg

A
V

Pulse

MPa

˚C

Condition

Sectional temperature

Outdoor unit

LEV opening

Discharge (TH1)
Heat exchanger inlet (TH5)

Accumulator

Suction (Comp)
CS circuit (TH2)
Shell bottom (Comp)

Heat exchanger outlet

Heat exchanger inlet

Inlet
Outlet

Outdoor
unit

Indoor
unit

OC

Ambient temp.

Indoor unit

Piping

• Heating

- 17 -

1 PUHY-P200·250YREM-A

Switch Function

Function according to switch operation Switch set timing

When off When on When off When on

SWU

SW1

SW2

SW3

SW4

1~2

1~8

3

9~10

1

2

3

4
5

6

7

8

9

10

1

2

3

4

5
6

7

8
9

10

1

2

3

Unit address setting
Refrigerant model

For self diagnosis/
operation monitoring

–

Centralized control switch

Deletion of connection
information.

Deletion of error history.

Refrigerant amount adjustments

–
Disregard ambient air
sensor errors, liquid
overflow errors.
Forced defrosting

Defrost prohibited timer

–

–
SW3-2 Function valid/
invalid
Indoor unit test operation

Defrosting start tempera­ture of TH
Defrosting end tempera­ture of TH5.
Opening angle of IC except
when heater thermostat is
ON during defrosting.

–
Pump down

Target Tc (High pressure)
in Heating

–

Models

Models
SW4-2 Function valid/

invalid
Configuration compensa­tion value

–

Set on 51~100 with the dial switch.

LED Monitering Displa

See Note2.

R407C R22

y

–
Centralized control not
connected.
Storing of refrigeration
system connection
information.

–

Ordinary control

–
Errors valid.

Ordinary control

39 min.

–

–
SW3-2 Function invalid

Stop all indoor units.

(no operation)

–

Ordinary control

49˚C

–

Invalid

–

–
Centralized control
connected.
Deletion of refrigeration
system connection
information.
Deletion

Adjustment operation

–
Disregard errors.

Start forced defrosting.

90 min.

–

–
SW3-2 Function valid

All indoor units test
operation ON.

–7˚C

For 2 minutes.For 2 minutes.

2000

–

Pump down

53˚C

–

Valid

–

Before power is turned on.

During normal operation when power
is on.
Should be set on OFF.
Before power is turned on.

Before power is turned on.

During normal operation when power
is on.

During normal operation when power is on
(only when switching from OFF/ON)

–
During normal operation when power
is on.

During normal operation when power
is on. (Except during defrosting)

–

–
During normal operation when power
is on.
When SW3-1 is ON after power is
turned on.
During normal operation when power
is on.
During normal operation when power
is on. (Except during defrosting)

–
During normal operation
(only when switching from OFF/ON)
During normal operation when power
is on.

–

–
Before power is turned on.
During normal operation when power
is on.
When SW4-1 is ON.

–

––– –
––– –
––

–
–

––

Night mode/Step demand

SWU3

R407C

Exist

R407C

Different unit model error

(7130)

Not exist

Different unit model error

(7130)

R22

R22

TH2

Night mode

Step demand

During normal operation when power is on.

–
–

–– –

–

– –

During normal
operation when
power is on.

10 minutes or
more after
compressor
starts.

Note 1

Note 2

• SWU1~2=00 when shipped from the factory. Other factory settings are indicated by shaded portions.

• If the address is set from 01 to 50, it automatically becomes 100.

•

The refrigerant model is recognized with SW3 and TH2.

Changes as shown below by on off change
0% 3%

6% 9% 12% –6% –3% 0%

4
5
6
7
8
9

10

[5] Function of Dip SW and Rotary SW

(1) Outdoor unit

Before power is turned on.

SW3-9

OFF

OFF

P200YREM-A–P250YREM-A

ON

–

ON

SW3-10

10˚C 15˚C

– 10˚C

- 18 -

(2) Indoor unit

DIP SW1, 3

Model P71 P80 P100 P125 P140 P200 P250
Capacity (model name) code

14 16 20 25 28 40 50

SW2 setting

Model P20 P25 P32 P40 P50 P63
Capacity (model name) code

45 681013

SW2 setting

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Note 1: The shaded part indicates the setting at factory shipment. (For the SW not being shaded, refer to the

2: When both SW1-7 and SW1-8 are being set to ON, the fan stops at the heating thermostat of OFF.

table belo

Note 3: The DipSW setting is only effective during unit stopping (remote controller OFF) for SW1,2,3 and 4 commonly

and the power source is not required reset.

w.)

Setting of DIP SW2

Indoor unit inlet

None

100h

Ineffective
Fan output display
At stationary heating

Very low speed

SW1-7 setting

Ineffective

Ineffective

Heat pump

None

None
None

1st setting

Down blow B, C

Effective

–

Effective

–
–

Built in remote controller

Provided

2500h

Effective

Thermo. ON signal display

Always at heat.

Low speed

Set airflow

Effective

Effective

Cool.only

Provided

Provided
Provided

2nd setting

Horizontal

–

Ineffective

Ineffective

–
–

Room temp. sensor position
Clogged filter detect.
Filter duration
OA intake
Remote display select.
Humidifier control
Heating thermo. OFF airflow
Heating thermo. OFF airflow
Power failure automatic

return
Power source start/stop
Model selection

Louver

Vane
Vane swing function
Vane horizontal angle
V
Vane first angle

ane angle set for cooling

–

Heating 4deg up

–
–

Alw

PLFY-VLMD-B only

ays ineffective for PKFY-P.VAM

Not provided for PKFY-P.VAM
Provided for PLFY-P.VGM (ON) setting

Always down blow B,C for PKFY-P.VAM
Horizontal (ON) setting for PLFY-P. VLMD-A

Ineffective (ON) setting for floor
standing

SW1

SW3

1
2
3
4
5
6
7
8

9

10

1

2

3
4
5

6

7
8
9

10

Switch SW name

Operation by SW

Switch set timing

OFF ON OFF ON

Remarks

At unit stopping

(at remote

controller OFF)

Cooling capacity saving
for PKFY-P. VAM,
effective/ineffective

Model

Switch

SW1

SW3

3
6
7
3
4
6
8

PLFY-P

VAM-A(2)

OFF
OFF

VLMD-B

VKM-A

OFF

ON

ON

ON

OFFONON

ON

PEFY-P

VML-A VMH-A

20~80VMM-A

100~140VMM-A

OFF

OFF ON

OFF ON

ON

ON

OFF
OFF

OFF

OFF

ON OFF

ON OFF ON

ON

ON

ON

OFF

PDFY-P PFFY-P PCFY-P PKFY-P

VM-A

ON

VLRM-A, VLEM-A

OFF

VGM-A

PMFY-P

VBM-A

ON

V AM-A VGM-A

OFF OFF

OFF
OFF

OFF

OFF

OFF

- 19 -

OFF

ON

OFF

ON

Ceiling height
3 3.5 m
2 2.8 m
1 2.3 m

Switch Function Operation by switch Switch set timing

SWA

SWA

SWA

SWB

SWC

Ceiling height setting

External static
pressure setting

For options

Setting of air outlet opening

Airflow control

(PLFY-P-VKM-A) (PCFY-P-VGM-A)

(PLFY-P125VLMD-B)

(PLFY-P-VKM-A)

(PLFY-P-VKM-A, PCFY-P-VGM-A, PKFY-P-VGM-A, PDFY-P-VM-A)

❇

The ceiling
height is
changed by
SWB setting.

❇

As this switch is used by interlocking with SWC,
refer to the item of SWC for detail.

SWA

SWB

123

2-way 3.5 m 3.8 m 3.8 m
3-way 3.0 m 3.3 m 3.5 m
4-way 2.7 m 3.0 m 3.5 m

❇

Set to the option to install the high efficiency
filter

Always after powering

Always after powering

Always after powering

Always after powering

Always after powering

3

1

2

2-way

4-way

3-way

3

1

2

3

1

2

3

1

2

Option

Standard

(PDFY-P20 ~ 80VM-A, PEFY-P20 ~ 80VMM-A)

100Pa

50Pa
30Pa

❇

For other models, change the setting of static pressure by replacing the connector.

Setting of DIP SW4 Setting of DIP SW5

12345

ON OFF ON OFF

ON OFF ON OFF

OFF

OFF

OFF OFF ON

ON OFF OFF

OFF

ON

ON

OFF ON OFF ON
OFF

OFF

OFF ON ON

ON

–

–
–

–
–

–

––

–

–––

–
–
–
–

–
–

ON ON

ON

ON

OFF
OFF

OFF

OFF

OFF

OFF OFF OFF

–

ON ON ON

–

OFF OFF OFF

–

ON OFF OFF

–

OFF OFF ON

–

ON ON ON OFF

PMFY-P-VBM-A
PLFY-P125VLMD-B
PDFY-P20 ~ 80VM-A
PLFY-P40 ~ 63VKM-A
PLFY-P80 ~ 125VAM-A(2)
PCFY-P-VGM-A
PKFY-P-VGM-A
PKFY-P-VAM-A
PEFY
PLFY-P20~100VLMD-B

-P20 ~ 80VMM-A

PFFY-P-VLEM-A, P-VLRM-A
PEFY-P20 ~ 32VML-A
PEFY-P40 ~ 140VMH-A
PEHY-P200·250VMH-A

PDFY-P100·125VM-A
PEFY-P100 ~ 140VMM-A

Model Circuit board used

SW4

Phase control

Relay selection

220V
240V

- 20 -

£ TEST RUN

[1] Before Test Run

(1) Check points before test run

1 Neither refrigerant leak nor loose power source/ transmission lines should be found.

2 Confirm that the resistance between the power source terminal block and the ground exceeds 2MΩ by measur-

ing it with a DC500V megger. Do not run if it is lower than 2MΩ.
Note) Never apply the megger to the MAIN board. If applied, the MAIN board will be broken.

3 Confirm that the Ball valve at both gas and liquid sides is being fully opened.

Note) Certainly close the cap.

45Be sure that the cr

Prior to Ver.E

The number of indoor units and the total number of remote controllers id displayed within the parenthesis ( ).

16 (32)
16 (32)

200 or lower

200 or higher

After Ver.F

20 (40)
16 (32)

(

❇

1)
Capability of the
connected indoor units

Number of connected indoor units that

can be connected without a RP.

Remote controller type

Remote controller PAR-F25MA

ankcase heater has been powered by turning the main power source on at least 12 hours

before starting the test run. The shorter powering time causes compressor trouble.

(2) Caution at inverter check

Because the inverter power portion in outdoor unit electrical part box have a lot of high voltage portion, be sure to follow
the instructions shown below.

During energizing power source, never touch inverter power portion because high voltage (approx. 580V) is
applied to inverter power portion.

When checking,

Shut off main power source, and check it with tester, etc.

Allow 10 minutes after shutting off main power source.

Open the MAIN board mounting panel, and check whether voltage of both ends of electrolytic capacitor is
20V or less.

1

2

1

2

3

If any of the power supply wires (L1, L2, L3, N, ) are mistakenly connected, it is possible to damage the unit.
Please exercise caution.

6

A transmission booster (RP) is required when the number of connected indoor unit models in a cooling system
exceeds the number of models specified in the chart below.
Note: The maximum number of units that can be controlled is determined by the indoor unit model, the type of

remote controller and their capabilities.

(

❇

1) If even one unit that is higher than 200 exists in the cooling system, the maximum capacity will be “200 or
higher”.

❇

Please refer to the installation manual for more details.

❇

Before turning power on to the outdoor unit, first turn on the transmission booster. (If the outdoor unit are mistakenly

turned on first, turn on the transmission booster and then reset the outdoor unit power.)

- 21 -

(3) Check points for test run when mounting options

(4) Attention for mounting drain water lifting-up mechanism

Check point

Local remote controller displays code
No. “2503”, and the mechanism stops.

No overflow from drain pan.
Drain water comes out by operations of

drain pump.
Sound of pump operations is heard, and

drain water comes out.
No water leakage from connecting

portions of water piping.
Water is supplied to water supply tank,

and float switch is operating.

Built-in optional parts
Mounting of drain

water removing
mechanism

Mounting of perme­able film humidifier

Content of test run

Release connector of pump circuit,
check error detection by pouring
water into drain pan water inlet.

After that, connect connector of
circuit.

Check pump operations and drain­age status in cooling (test run) mode.

Check humidifier operations and water
supply status in heating (test run) mode.

1

2

3

4

5

Result

1

2

3

Work

Disassembling and
assembling of drain
water removing
mechanism

Mounting of float
switch

Electric wiring

Float switch moves smoothly.
Float switch is mounted on

mounting board straigh and

without deformation.

Float switch has no contact with

copper pipe.
Wiring procedure is exactly followed.
Connector portion is tightly hooked.

Content of test run

Lead wire from the control box is not
damaged.

Rubber cap is properly inserted into
drain water outlet of the drain pan?

Insulation of gas and liquid
pipe is dealt with as shown in the
right figure?

Drain pan and piping cover are
mounted without gap?

Drain pan hooked on cut projection
of the mechanism?

Float switch is installed without contacting
the drain pan?

No mistakes in wiring?
Connectors connected securely and

tightly?
No tension on lead wire when sliding

on control box?

1
2

3

1
2

3

Check point Result

Insulation pipe

No gap

- 22 -

- 23 -

(5) Check points for system structure

ex. PUHY-P200YREM-A

Check points from installation work to test run.

Trouble

Not operate.

Not cool (at cooling).
Not heat (at heating).

Not cool, not heat, error stop.
Condensation drip in piping.
Not cool, not heat, error stop.

Water leak, condensation drip in drain piping.

Error stop, not operate.

Electric shock.
Error stop, not operate.
Some electric parts should be damaged.

Classification

Installation and
piping

Power source
wiring

Portion

1

2

3

4

5

6

7

8

1

2

3

4

Check item

Instruction for selecting combination of outdoor unit,
and indoor unit followed? (Maximum number of indoor
units which can be connected, connecting model name,
and total capacity.)

Follow limitation of refrigerant piping length? For ex­ample, 80m or less (total length : 240m) at the farthest.

Connecting piping size of branch piping correct?
Refrigerant piping diameter correct?
Refrigerant leak generated at connection?
Insulation work for piping properly done?
Specified amount of refrigerant replenished?

Pitch and insulation work for drain piping properly done?
Specified switch capacity and wiring diameter of main

power source used?

Proper grounding work done on outdoor unit?
The phases of the L line (L1, L2, L3) correct?
L line and N line connected correct?

Classification
Transmission

line

Portion Check item

¡

Limitation of transmission line length followed? For
example, 200m or less (total length : 500m) at the farthest.

™ 1.25mm2 or more transmission line used?

(Remote controller 10m or less 0.75mm

2

)

£ 2-core cable used for transmission line?

¢

Transmission line apar t from power source line by 5cm or more?

∞ One refrigerant system per transmission line?

§

The short circuit connector is changed form CN41 to
CN40 on the MAIN board when the system is centralized
control? (Just one outdoor unit. Not all outdoor units.)

¶ • No connection trouble in transmission line?

• Connection of wrong remote controller line terminals?

• MA Remote controller : TB15

• M-NET Remote controller : TB5

Trouble

Erroneous operation, error stop.

Erroneous operation, error stop.

Error stop in case multiple-core
cable is used.

Erroneous operation, error stop.
Not operate.
Not operate.

Error stop or not operate.
Never finish the initial mode.

System set

Before starting

Error stop or not operate.

Can not be properly set with power
source turned on.

Not operate.
Set temperature not obtained at

heating operations (Thermostat
stop is difficult)

Error stop.

Error stop, compressor trouble.

1

2

1

2
3

4

Address setting properly done? (M-NET Remote
controller, indoor unit and outdoor unit.)

Setting of address No. done when shutting off power
source?

Address numbers not duplicated?
Turned on SW3-8 on indoor unit circuit board when

mounting room thermistor sensor?

Refrigerant piping ball valve (Liquid pressure pipe, gas
pressure pipe) opened?

Turn on power source 12 hours before starting operations?

STAND BY
DEFROST

ERROR CODE

D A I L Y

AUTO OFF

CENTRALLY CONTROLLED

CLOCK

REMAINDER

ON OFF

˚C

1Hr.

NOT AVAILABLE

˚C

CHECK MODE

FILTER

CHECK

TEST RUN

LIMIT TEMP.

ON/OFF

TEMP

FILTER

CHECK TEST

ON OFF

CLOCK

PAR-F27MEA

TIMER SET

2 31

Breakers

for Current

Leakage

Switch

- 24 -

1Hr.

˚C

ON OFF

CLOCK

REMAINDER

ERROR CODE

˚C

ON OFF

CLOCK

NOT AVAILABLE

CHECK MODE

LIMIT TEMP.

ON/OFF

FILTER

TEST RUN

FILTER

CHECK TEST

PAR-F27MEA

STAND BY
DEFROST

CENTRALLY CONTROLLED

D A I L Y

AUTO OFF

CHECK

TEMP

TIMER SET