Page 1
AIR-COOLED SPLIT-TYPE
PACKAGED AIR CONDITIONERS
2003
TECHNICAL & SERVICE MANUAL
<Outdoor unit>
Models
HEAT PUMP PUH-P8MYA, PUH-P10MYA
(Single and Twin/Triple/Four)
For use with the R407C
Page 2
Contents
Page
1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT ...................................... 1
[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
2 SPECIFICATIONS ...................................................................................................................... 8
3 EXTERNAL DIMENSIONS ....................................................................................................... 10
4 ELECTRICAL WIRING DIAGRAM ............................................................................................ 11
[1] Outdoor Unit ....................................................................................................................... 11
[2] Skelton of Indoor/Outdoor Connection .............................................................................. 12
5 Technical Data of PUH-8/10YD to Meet LVD ......................................................................... 13
[1] Standard Operation Data ................................................................................................... 13
[2] Cooling Capacity Curves ................................................................................................... 14
[3] Heating Capacity Curves ................................................................................................... 14
[4] Capacity Reduction Ratio due to Changes in Piping Length ............................................. 15
[5] Center of Gravity (Outdoor unit) ........................................................................................ 16
[6] NC Curve (Outdoor unit) ................................................................................................... 17
6 SERVICE DATA ........................................................................................................................ 18
[1] Appearance of Equipment ................................................................................................. 18
[2] Refrigerant Circuit .............................................................................................................. 20
[3] Limitation of Refrigerant Piping Length.............................................................................. 20
[4] Refrigerant Piping .............................................................................................................. 21
[5] Refrigerant Charge ............................................................................................................ 21
[6] Operation Rage ................................................................................................................. 21
7 CONTROL ................................................................................................................................ 22
[1] Composition of Control ...................................................................................................... 22
[2] Control specifications......................................................................................................... 23
[3] Function of switches and connectors (outdoor unit) .......................................................... 27
[4] Simple parts check method ............................................................................................... 35
[5] Reference Data.................................................................................................................. 36
[6] Troubleshooting of each part ............................................................................................. 37
[7] Emergency operation......................................................................................................... 40
[8] Self-diagnosis and troubleshooting.................................................................................... 42
8 Test run .................................................................................................................................... 51
Page 3
1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT
Caution
Do not use the existing refrigerant piping.
• The old refrigerant and refrigerator oil in the existing
piping contains a large amount of chlorine which may
cause the refrigerator oil of the new unit to deteriorate.
Use refrigerant piping made of C1220 (CU-DHP) phosphorus deoxidized copper as specified in the *JIS
H3300 “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, oils,
moisture, or any other contaminant.
• Contaminants on the inside of the refrigerant piping
may cause the refrigerant residual oil to deteriorate.
*JIS: Japanese Industrial Standard
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.)
Use a vacuum pump with a reverse flow check valve.
• The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerator oil to deteriorate.
Do not use the following tools that have been used
with conventional refrigerants.
(Gauge manifold, charge hose, gas leak detector, reverse flow check valve, refrigerant charge base,
vacuum gauge, refrigerant recovery equipment)
• If the conventional refrigerant and refrigerator oil are
mixed in the R407C, the refrigerant may deteriorated.
• If water is mixed in the R407C, the refrigerator oil may
deteriorate.
• Since R407C does not contain any chlorine, gas leak
detectors for conventional refrigerants will not react to
it.
Do not use a charging cylinder.
• Using a charging cylinder may cause the refrigerant
to deteriorate.
• 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 refrigerator oil to coat flares and flange connections.
• The refrigerator 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 a refrigerant other than R407C.
• If another refrigerant (R22, etc.) is used, the chlorine
in the refrigerant may cause the refrigerator oil to deteriorate.
Be especially careful when managing the tools.
• If dust, dirt, or water gets in the refrigerant cycle, the
refrigerant may deteriorate.
If the refrigerant leaks, recover the refrigerant in the
refrigerant cycle, then recharge the cycle with the
specified amount of the liquid refrigerant indicated
on the air conditioner.
• Since R407C is a nonazeotropic refrigerant, if additionally charged when the refrigerant leaked, the composition of the refrigerant in the refrigerant cycle will
change and result in a drop in performance or abnormal stopping.
–1–
Page 4
[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.
–2–
Page 5
[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–
Page 6
[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 Identification of dedi-
cated use for R407C:
Record refrigerant name
and put brown belt on
upper part of cylinder.
Vacuum pump Vacuum drying Current product Can be used by attach-
ing an adapter with a
check valve.
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 Ester oil or Ether oil or
Alkybenzene (Small
amount)
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.
–4–
Page 7
[4] Brazing
No changes from the conventional method, but special care is required so that foreign matter (ie. 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 hygroscopic 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–
Page 8
[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 refrigerant 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 valve 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 0.5 Torr (500 MICRON) 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 5 Torr. Do not use a general gauge manifold since it cannot measure a
vacuum of 5 Torr.
4. Evacuating time
• Evacuate the equipment for 1 hour after –755 mmHg (5 Torr) 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.
–6–
Page 9
[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
Cylin-
Cylin-
der
Cylinder color identification R407C-Gray Charged with liquid refrigerant
R410A-Pink
Valve
der
Valve
Liquid
Liquid
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 evaporation temperature is closest to the outside temperature 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.
–7–
Page 10
2 SPECIFICATIONS
Specifications of air-source heat pump type packaged air conditioner
(Outdoor unit)
Model name PUH-P8MYA Quantity
Cooling Heating
Capacity
Power source
Power input kW
Current A
Type x Quantity
Fan Airflow rate m3/min
Motor output kW
Type
Compressor Motor output kW
Crankcase heater kW
Refrigerant/Lubricant
External finish
External dimension mm
Protection
device
High pressure protection MPa
Compressor/Fan
kcal/h
kW
18,000 20,400
20.9 23.7
3N~ 380/400/415 V 50 Hz
7.27 7.17
13.0 12.8
Propeller fan × 1
185
0.38
Hermetic
5.5
0.05 (240 V)
R407C/FVC68D
Steel plate painting with polyester powder
(MUNSELL 5Y8/1 or similar)
1,715(H) × 990(W) × 840(L)
3.3
Overcurrent protection/Thermal switch
Refrigerant piping diameter Liquid/Gas mm
Indoor unit
Noise level dB (A)
Net weight kg
Operating temperature range
1. Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Cooling Indoor: 27 °CDB/19 °CWB Outdoor: 35
Notes:
Heating Indoor: 20 °CDB Outdoor: 7
Pipe length: 7.5 m Height difference: 0 m
2. Works not included: Installation/Foundation work, Electrical connection work, Duct work, Insulation
work, Power source switch, and other items not specified in this specifications.
ø12.7 Flare / ø25.4 Flange
PEH-P8MYA
56
215
Indoor: 15 °CWB~24 °CWB Indoor: 15°CDB~27 °CDB
Outdoor: –5 °CDB~46 °CDB
Outdoor: –12 °CWB~18 °CWB
°
CDB
°
CDB/6 °CWB
–8–
Page 11
Specifications of air-source heat pump type packaged air conditioner
(Outdoor unit)
Model name PUH-P10MYA Quantity
Cooling Heating
Capacity
Power source
Power input kW
Current A
Type x Quantity
Fan Airflow rate m3/min
Motor output kW
Type
Compressor Motor output kW
Crankcase heater kW
Refrigerant/Lubricant
External finish
External dimension mm
Protection
device
High pressure protection MPa
Compressor/Fan
kcal/h
kW
22,400 26,200
26.0 30.5
3N~ 380/400/415 V 50 Hz
9.02 8.62
16.0 15.4
Propeller fan × 1
185
0.38
Hermetic
7.5
0.05 (240 V)
R407C/FVC68D
Steel plate painting with polyester powder
(MUNSEL 5Y8/1 or similar)
1,715(H) × 990(W) × 840(L)
3.3
Overcurrent protection/Thermal switch
Refrigerant piping diameter Liquid/Gas mm
Indoor unit
Noise level dB (A)
Net weight kg
Operating temperature range
1. Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Cooling Indoor: 27 °CDB/19 °CWB Outdoor: 35 °CDB
Notes:
Heating Indoor: 20 °CDB Outdoor: 7 °CDB/6 °CWB
Pipe length: 7.5 m Height difference: 0 m
2. Works not included: Installation/Foundation work, Electrical connection work, Duct work, Insulation
work, Power source switch, and other items not specified in this specifications.
ø12.7 Flare / ø28.6 Flange
PEH-P10MYA
57
220
Indoor: 15 °CWB~24 °CWB Indoor: 15 °CDB~27 °CDB
Outdoor: –5 °CDB~46 °CDB Outdoor: –12 °CWB~18 °CWB
–9–
Page 12
3 EXTERNAL DIMENSIONS
65
60
84
100
251
234
60
75
194
100
48
80
40
121
50
6
5
840
910
15
880
15
990
215
215
560
1715
225
1490
413
55
190
149
40
70
165
31
80
79
55
378
160
25
198
237
80
73
Service panel
4-14X20 holes
<For mounting
anchor bolt M8>
(Field supply)
Plane view
Rear view
Left side view
Front view
Right side view
Refrig. service
valve (liquid)
φ
12.7<flare>
Refrig. service
valve(gas)
<flange>
φ
38.1 Knockout hole
<Bottom side hole for
the power supply>
φ
38.1 Knockout hole
<Left side hole for
the power supply>
Knockout hole
<Front side hole for
the power supply and
control wiring>
φ
38.1 Knockout hole
<Right side hole for
the power supply>
φ
25.4 Knockout hole
<Bottom side hole for
the control wiring>
φ
25.4 Knockout hole
<Left side hole for
the control wiring>
φ
25.4 Knockout hole
<Right side hole for
the control wiring>
Knockout hole
Left piping hole
Knockout hole
Front piping hole
Knockout hole
Pressure gauge
(for option)
Knockout hole
Rear piping hole
(It is necessary
for the option)
Connecting pipe
8 :
φ
25.4<brazed>
10 :
φ
28.6<brazed>
Note 1
Note 2
Note 3
Knockout hole
Bottom piping hole
Cross section X-X
Cross section Y-Y
XX
Y
Y
Air outlet
Air
inlet
Air
inlet
• Models PUH-P8MYA/P10MYA
34 or
φ
34 by selecting
27 or
φ
φ
27 or
φ
the piping when you connected the piping from
the bottom.
(Please be careful not to close the hole of the
bottom plate by the basement.)
27 ............................................................................ 1pc.
34 ............................................................................ 1pc.
(The connecting pipe is fixed with the unit)
<Accessory>
(It is attached control box cover)
• Refrigerant connecting pipe ...................................... 1pc.
• Packing for connecting pipe ...................................... 1pc.
• Conduit mounting plate
40 ............................................................................ 1pc.
(Painted the same color as the unit body)
φ
φ
φ
Note: 1. Please leave a space under the outdoor unit for
• Tapping screw 4 x 12 .............................................. 4pcs.
40 by selecting the conduit mounting plate.
the conduit mounting plate.
φ
2. It is possible to change to
3. The hole size can be selected to
–10–
Page 13
4 ELECTRICAL WIRING DIAGRAM
[1] Outdoor Unit
• Model PUH-P8MYA/P10MYA
63H1
MC
RED
51C
52C
RED
WHITE WHITE
TB1
L1
L2 L3 N PE
POWER SUPPLY
3N~PE
380/400/415V
50HZ
(*1)
BLACK
13 1
C11
(3P)
1
CNFAN
F.C.
BOARD
CNOUT1
11
(5P)
1
3
5
7
CNIN
(7P)
GREEN/YELLOW
BLACK
BLUE
PE
CIRCUIT BREAKER
(FIELD SUPPLY)
PUH-P8MYA-EU : 50A
PUH-P10MYA-EU: 60A
MF
35
(5P)
CNFC2
CNPO
(5P)
3
F10
F20
F30
F1
F2
3
1
(6P)
6
5
CNOUT2
N.F.BOARD
TB3
C12
(3P)
52C
3
(3P)
S1 S2 S3
SV1
PE
CH
21S4
51C
52C
TB8
OUT OUT ININ
TO INDOOR UNIT
CONNECTING WIRES (*2)
(POLER)
63L
CN23
1
3
CN22
1
3
CN21
1
3
CN26
1
3
5
CN25
1
3
CN53
1
3
CN52
1
3
5
6
CNFC1
1
6
(7P)
CN20
7
L1
F01
N
F04
L2
F02
L3
1
F03
X1
INDOOR UNIT
TB4
S1
S2
S3
(3P)
(3P)
(3P)
(5P)
(3P)
(3P)
(6P)
(6P)
3
CNVMNT
(3P)
X04
X01
X02
X05
CNFG
(3P)
1
TH1
TH2
1
2
CN2
(2P)
O
OFF
2
16
SW1
O
OFF
1
SW2
CN28
(3P)
3
1
TR
X03
CNMNT
(5P)
O
OFF
1
(*3)
4
SW5
SW3
LED1
Transmission
Circuit
O
OFF
CNS3
(3P)
LEV
CN40
(6P)
1
SW4
3
OUTDOOR UNIT CONTROL BOX
TH3
212
(2P) (2P)
6
DC power
supply
CN34
(3P)
131
1
CN4CN3
CN3D
(3P)
CN3S
(3P)
CN3N
(3P)
CN24
(3P)
CN27
(3P)
CN81
(3P)
CN51
(5P)
X1
3
1
63H2
2
3
1
1
C14
(2P)
Note :
1. Be sure to apply earth work to the unit.
(Use the earth terminal of TB1.)
2. The dotted lines show field wiring.
3. Color of earth wire is yellow and green
twisting.
4. This motor (*1) includes auto reset type
internal thermostat.
5. Indoor and outdoor connecting wires
(*2) are made with polarities, make
sure matching wiring and terminal.
6. SW5 (*3) is shown PUH-P10MYA setting.
In case of PUH-P8MYA setting is
shown as below.
(*3)
ON
OFF
14
SW5
Caution :
1. To protect compressor from abnormal current, over current relays is installed. Therefore, do not change factory set value of over
current relays.
Symbol Name
F1, F2 FUSE (15A 250VAC CLASS T)
F01~F04 FUSE (6.3A 250VAC CLASS F)
F10~F30 FUSE (6.3A 250VAC CLASS F)
51C OVER CURRENT RELAY (COMPRESSOR)
52C MAGNETIC CONTACTOR (COMPRESSOR)
63L PRESSURE SWITCH (LOW PRESSURE)
63H1 PRESSURE SWITCH (HIGH PRESSURE)
63H2 PRESSURE SWITCH (FOR CONTROL)
MC COMPRESSOR MOTOR
MF FAN MOTOR (OUTDOOR)
TR TRANSFORMER
X1 AUXILIARY RELAY (FOR 16, 20HP)
LED 1 LED (FOR SERVICE)
XO1~X05 AUXILIARY RELAY (MAIN BOARD)
CN2,CN20~28
CN3,34,30,3N,3S
CN4,40,51~53,81
CONNECTOR MAIN BOARD
CNFC1, FG, S3
CNMT,VMNT
Symbol Name
SW1~SW5 SWITCH (MAIN BORD)
21S4 4-WAY VALVE
SV1 SOLENOID VALVE
CH CRANK CASE HEATER (COMPRESSOR)
LEV ELECTRINIC EXPANSION VALVE
TH1 LIQUID TEMP.
TH2 THERMISTOR DISCHARGE TEMP.
TH3 COND./EVA. TEMP.
TB1 POWER SOURCE TERMINAL BLOCK
TB3, 4 OUTDOOR/INDOOR CONNECTION TERMINAL BLOCK
TB8 TERMINAL BLOCK (FOR 16, 20HP)
C11, C12 CONNECTOR (FAN MOTOR)
C14 CONNECTOR (63H2)
CAFAN, CNFC2
CNPO
CNOUT1, 2
CNIN
CONNECTOR (F. C. BOARD)
CONNECTOR (N, F. BOARD)
–11–
Page 14
[2] Skelton of Indoor/Outdoor Connection
(1) Applicable combinations of 8 & 10HP [PUH-P8MYA/P10MYA]
Indoor Units
PEH-P*MYA
PLH-P*KAH, PLH-P*AAH
PLA-P*KA, PLA-P*AA
PEHD-P*EAH, PEAD-P*EA
PCH-P*GAH, PCA-P*GA
PUH-P8MYA
PKH-P*GALH, PKH-P*FALH
PKA-P*GAL, PKA-P*FAL
PSH-P*GAH, PSA-P*GA
Indoor Units
PEH-P*MYA
PLH-P*KAH, PLH-P*AAH
PLA-P*KA, PLA-P*AA
PEHD-P*EAH, PEAD-P*EA
PCH-P*GAH, PCA-P*GA
PUH-P10MYA
PKH-P*GALH, PKH-P*FALH
PKA-P*GAL, PKA-P*FAL
PSH-P*GAH, PSA-P*GA
Multi distributor pipes
(Option)
* indicates applicable HP.
Single
8HP
–
–
–
–
–
10HP
–
–
–
–
–
–
50 : 50
4HP+4HP
–
5HP+5HP
–
–
SDD-50WSA-E
33 : 33 : 33
2.5HP+2.5HP
+2.5HP
–
–
3HP+3HP
+3HP
–
SDT-111SA-E
25 : 25 : 50
2HP+2HP
+4HP
–
–
2.5HP+2.5HP
+5HP
–
–
–
SDT-112SA-E
20 : 40 : 40
1.6HP+3HP
+3HP
–
–
–
2HP+4HP
+4HP
–
–
SDT-122SA-E
25 : 25 : 25 : 25
2HP+2HP
+2HP+2HP
–
–
2.5HP+2.5HP+
2.5HP+2.5HP
–
–
SDT-1111SA-E
(2) System
Outdoor unit
Twin
Outdoor unit
3-core cable
Pipe work
3-core cable
Transmission
line
Pipe work
Indoor unit
Remote
controller
Remote
controller
Transmission line
Indoor units
Distributor
TripleSingle
3-core cable
Outdoor unit
Four
3-core cable
Outdoor unit
Transmission
line
Transmission
line
Remote
controller
Pipe work
Remote
controller
Pipe work
Indoor units
Distributor
Indoor units
Distributor
–12–
Page 15
5 Technical Data of PUH-P8MYA/P10MYA to Meet LVD
[1] Standard Operation Data
(1) PUH-P8MYA
Operating condition Cooling Heating
Voltage V
Power source frequency Hz
Indoor air condition (DB/WB) °C
Outdoor air condition (DB/WB) °C
Piping length m
Operating condition
Refrigerant charge kg
Current A
Outdoor unit
Indoor unit
Electrical characteristics
Discharge pressure MPa
Suction pressure MPa
Discharge refrigerant temperature °C
Suction refrigerant temperature °C
Liquid pipe temperature
Refrigerant circuit
Compressor shell bottom temperature °C
Input kW
Compressor current A
Fan current A
Current A
Input kW
(at piping sensor)
°C
380 400 415 380 400 415
50 50 50 50 50 50
27/19 27/19 27/19 20/– 20/– 20/–
35/- 35/– 35/– 7/6 7/6 7/6
7.5 7.5 7.5 7.5 7.5 7.5
6.9 6.9 6.9 6.9 6.9 6.9
13.0 13.0 13.0 12.8 12.8 12.8
7.27 7.27 7.27 7.17 7.17 7.17
11.9 11.9 11.9 11.7 11.7 11.7
1.1 1.1 1.1 1.1 1.1 1.1
1.12 1.12 1.12 1.12 1.12 1.12
0.65 0.65 0.65 0.65 0.65 0.65
2.11 2.11 2.11 1.91 1.91 1.91
0.48 0.48 0.48 0.40 0.40 0.40
75 75 75 70 70 70
6 660 00
46 46 46 0 0 0
35 35 35 30 30 30
Note: The values listed above indicate that when connected with the indoor unit PEH-P8MYA as representative data.
(2) PUH-P10MYA
Operating condition Cooling Heating
Voltage V
Power source frequency Hz
Indoor air condition (DB/WB) °C
Outdoor air condition (DB/WB) °C
Piping length m
Operating condition
Refrigerant charge kg
Current A
Outdoor unit
Indoor unit
Electrical characteristics
Discharge pressure MPa
Suction pressure MPa
Discharge refrigerant temperature °C
Suction refrigerant temperature °C
Liquid pipe temperature
Refrigerant circuit
Compressor shell bottom temperature °C
Input kW
Compressor current A
Fan current A
Current A
Input kW
(at piping sensor)
°C
380 400 415 380 400 415
50 50 50 50 50 50
27/19 27/19 27/19 20/– 20/– 20/–
35/- 35/– 35/– 7/6 7/6 7/6
7.5 7.5 7.5 7.5 7.5 7.5
7.4 7.4 7.4 7.4 7.4 7.4
16.0 16.0 16.0 15.4 15.4 15.4
9.02 9.02 9.02 8.62 8.62 8.62
14.9 14.9 14.9 14.3 14.3 14.3
1.1 1.1 1.1 1.1 1.1 1.1
1.64 1.64 1.64 1.64 1.64 1.64
0.94 0.94 0.94 0.94 0.94 0.94
2.22 2.22 2.22 1.75 1.75 1.75
0.50 0.50 0.50 0.38 0.38 0.38
80 80 80 65 65 65
888–1–1–1
48 48 48 0 0 0
30 30 30 20 20 20
Note: The values listed above indicate that when connected with the indoor unit PEH-P10MYA as representative data.
–13–
Page 16
[2] Cooling Capacity Curves
• PUH-P8MYA/P10MYA
1.4
Indoor inlet air wet
1.2
bulb tem
p. <˚CW
B>
1.22
1.1
22
20
18
16
1
Capacity ratio
0.8
0.6
-5-3-113579111315171921232527293133353739414345
Outdoor air temperature <˚CDB>
[3] Heating Capacity Curves
• PUH-P8MYA/P10MYA
1.4
1.2
22
20
18
16
Input ratio
0.9
inlet air wet
Indoor
0.7
-5-3-113579111315171921232527293133353739414345
Outdoor air temperature <˚CDB>
1.4
15
20
25
1.2
bulb temp. <˚CWB>
25
20
15
1
Capacity ratio
0.8
0.6
-12-10-8-6-4-2024681012141618
Indoor inlet air dry
bulb temp. <˚CDB>
Outdoor air temperature <˚CWB>
1
Input ratio
Indoor inlet air dry
0.8
0.6
-12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18
Outdoor air temperature <˚CWB>
bulb temp. <˚CDB>
–14–
Page 17
[4] Capacity Reduction Ratio due to Changes in Piping Length
(1) Cooling capacity
PUH-P8MYA
1
0.9
Capacity ratio
0.8
0 10 20 30 40 50 60 70
Equivalent piping length (m)
(2) Heating capacity
Equivalent piping length
Model name
- 30 m 30 - 50 m 50 - 70 m
PUH-P8MYA
1.0 0.995 0.99
PUH-P10MYA
PUH-P10MYA
1
0.9
Capacity ratio
0.8
0 10 20 30 40 50 60 70
Equivalent piping length (m)
(3) Calculation formula of equivalent piping length
PUH-P8MYA Equivalent piping length (m) = Actual piping length (m) + (0.47 × Number of bend)
PUH-P10MYA Equivalent piping length (m) = Actual piping length (m) + (0.5 × Number of bend)
(4) Reduction ratio by frosting
Outdoor unit inlet wet bulb temperature
(°CWB)
6 1.0
4 0.98
2 0.88
0 0.85
–2 0.86
–4 0.89
–6 0.92
–8 0.92
–10 0.92
Heating capacity reduction ratio
–15–
Page 18
[5] Center of Gravity (Outdoor unit)
(1) Caution for Lifting
Warning
Lift unit slowly by suspending rope uniformly
so that the rope will not slip off or unit will not
incline seriously.
Be careful that unit may fall down if the rope is
not in a proper position as the center or
gravity of unit is being inclined.
Protection pad
Use pads properly to
prevent the scratching of
external panel
caused by contact
with sling.
Name plate
Indicates the unit
front side.
Below 40˚
Blow 40ß
Hanger rope (Over 7m × 2)
Must be durable against unit weight.
For the lifting of unit for movement, please
be sure to suspend at four points, and not
to give any shock to unit.
Never apply two-point lifting as it is
dangerous.
Service panel
Compressor position
Suspending spot
2-point,front and rear
Model name
Item
PUH-P8MYA
PUH-P10MYA
Center of gravity
Inclining to the right
front side of unit.
G
Z
X
Center of gravity (mm)
XYZ
Y
Fasten here properly
to prevent unit from
slipping off from
the sling at lifting.
Net weight
(kg)
330 350 490 215
300 330 510 220
–16–
Page 19
[6] NC Curve (Outdoor unit)
(1) Octave Band Analysis
1) PUH-P8MYA
Measurement condition
1m
A
1m
B
Sound pressure level in anechoic room
56 dB (A)
63Hz63125Hz59250Hz56500Hz551000Hz502000Hz454000Hz428000Hz
39
70
60
50
40
30
20
OCTAVE BAND PRESSURE LEVEL< dB> 0dB = 0.0002 bar
Approximate minimum
audible limit on
continuous noise
10
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND CENTER FREQUENCIES <Hz>
(dB)
NC60
NC50
NC40
NC30
NC20
Note: The measuring point is 1m from the bottom of the unit (1m from the front of the unit).
2) PUH-P10MYA
Measurement condition
1m
A
1m
B
Sound pressure level in anechoic room
57 dB (A)
63Hz63125Hz60250Hz56500Hz561000Hz512000Hz474000Hz448000Hz
40
70
60
50
40
30
20
OCTAVE BAND PRESSURE LEVEL< dB> 0dB = 0.0002 bar
Approximate minimum
audible limit on
continuous noise
10
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND CENTER FREQUENCIES <Hz>
(dB)
NC60
NC50
NC40
NC30
NC20
Note: The measuring point is 1m from the bottom of the unit (1m from the front of the unit).
–17–
Page 20
6 SERVICE DATA
[1] Appearance of Equipment
• PUH-P8MYA/P10MYA Detail of Electrical Parts Box
(with cover removed) (with Main Board Panel removed)
Transformer
Power source
terminal block
Terminal block for
outdoor/indoor control
wiring connection
• PUH-P8MYA/P10MYA (with cover removed)
Terminal block for
defrosting signal
F. C.
BOARD
MAIN
BOARD
N. F.
BOARD
Relay for defrosting
signal receiving
<X1>
Overcurrent relay
<51C>
Magnetic contactor for
compressor <52C>
Outdoor unit heat exchanger
Compressor
Electrical parts box
Ball valve for refrigerant piping connection <Liquid side> Flare
Ball valve for refrigerant piping connection <Gas side> Flange
–18–
Page 21
• PUH-P8MYA/P10MYA (Detail of machine room)
Thermistor <Condenser/evaporator temp.> TH3
(At the back of the heat exchanger panel (header cover).
When this screw is removed, the header cover is removed.)
Pressure switch
(63H2)
4-way valve
Pressure switch
(63H1)
Thermistor
<Liquid temp.>
TH1
Check joint
(low pressure)
Pressure switch
(63L)
Check joint
(high pressure)
Solenoid valve(SV1)
Accumulator
Electric expansion
valve (LEV)
Thermistor
<Discharge temp.>
TH2
–19–
Page 22
H
h
L
a
b
[2] Refrigerant Circuit
Indoor
units
Indoor heat exchanger
Service port
Ball valve
Outdoor unit
Strainer
Service port
Low pressure
switch
(Protection)
Solenoid valve
Strainer
High pressure switch
(Protection)
High pressure
switch (Control)
Muffler
Outdoor heat exchanger
Service port
Accumulator
Service port
Strainer
Multiple-distributor
Ball valve
[3] Limitation of Refrigerant Piping Length
(1) Single (2) Twin
H
L ≤ 50 m
H ≤ 40 m
(3) Triple
a
h
H
PUH-P8,10
L
(4) Four
b
c
PUH-P8,10
L
Compressor
Flare connection
Flange connection
Brazing connection
h
H
Electric expansion valve
Capillary tube
<
<
Cooling operation
Heating operation
PUH-P8,10
L + a + b ≤ 70 m
L + a, L + b ≤ 50 m
a – b ≤ 8 m
H ≤ 40 m, h ≤ 1 m
a
b
c
L
d
PUH-P8,10
L + a + b + c ≤ 70 m
L + a, L + b, L + c ≤ 50 m
a – b, b – c , c – a ≤ 8 m
H ≤ 40 m, h ≤ 1 m
L + a + b + c + d ≤ 70 m
L + a, L + b, L + c, L + d ≤ 50 m
a – b , b – c , c – d, d – a ≤ 8 m
H ≤ 40 m, h ≤ 1 m
* Total bends are 15 units, and max. bends are 8 units within L + a, L + b, L + c and L + d.
–20–
Page 23
[4] Refrigerant Piping
Model Gas pipe Liquid pipe
Outdoor unit
PUH-P8MYA ø25.4 ø 12.7
PUH-P10MYA ø
28.58 ø 12.7
1.6, 2, 2.5, 3 ø 15.88 ø9.52
4, 5 ø19.05 ø 9.52
Indoor unit
8 ø 25.4 ø 12.7
10 ø28.58 ø
12.7
[5] Refrigerant Charge
Model
PUH-P8MYA
PUH-P10MYA
L: Main section actual length
Amount of infusion of
coolant at ex-factory
R407C 6.0 kg
R407C 6.5 kg
a + b + c + d: Join section actual length
0.026× L + 0.014 × ( a + b + c + d) + 1.7
× amount of indoor units. (kg)
0.026 × L + 0.014 × (
× amount of indoor units. (kg)
The value of calculation result at the second decimal place must be rounded up to the first decimal place.
(e.g. 2.22 kg must be rounded up to 2.3 kg)
Additional refrigerant charge
a + b + c + d) + 1.7
[6] Operation Rage
24
Indoor air temperature (°CWB)
15
-5 46
Outdoor air temperature (°CDB)
Cooling Heating
27
Indoor air temperature (°CDB)
15
–12 18
Outdoor air temperature (°CWB)
–21–
Page 24
7 CONTROL
[1] Composition of Control
1. Function block diagram
3N~
380/400/415 V
50 Hz
outdoor
indoor
Electrical
terminal block
Indoor/outdoor
connection terminal
block
Fuse
Indoor/outdoor
connection terminal
block
Fuse
Fuse
microcomputer
Communication
circuit
DC/DC
converter
LED1
<Power>
Transformer
DC5V for
12V
Magnetic
contractor
Fuse
Semiconductor
relay
Fan control
Over current
relay
4-way valve, LEV,
solenoid valve,
crankcase heater
Outdoor fan
Semiconductor
relay
Compressor
Louver
Vane
Drain pump
Others
Remote
controller
terminal block
Remote controller
terminal block
Remote controller
Current
detection
LED2 LED3
<Supply power>
DC5V
5V
<Indoor/outdoor units communication>
Key input
LCD
Send/receive
Communication
circuit
Fan control
Indoor fan
–22–
Page 25
[2] Control specifications
(1) Protection functions
1) The main protection devices for the outdoor unit are:
a) High pressure protection (63H1)
b) Compressor overcurrent protection (51C)
c) Liquid temp thermistor trouble (TH1)
d) Discharge temperature protection (TH2 ≥11 8 °C)
e) Discharge temp thermistor trouble (TH2)
f) Condenser/evaporater temp thermistor trouble (TH3)
g) Low pressure protection (63L)
2) When tripping of a detection device is sensed, the check mode is entered and the compressor is stopped. (After 3
minutes, the compressor restarts.) Thereafter, the compressor is stopped when the specified number of check
modes or greater is sensed within the check time.
Protection functions
a) High pressure protection
(63H1)
b) Compressor overcurrent
protection (51C)
c) Liquid temp thermistor
trouble (TH1)
d) Discharge temperature
protection (TH2
>
118 °C)
=
e) Discharge temp ther-
mistor trouble (TH2)
f) Condenser/evaporater
temp thermistor trouble
(TH3)
g) Low pressure protection
(63L)
Operation value
3.3 MPa
P8MYA: 22 A
P10MYA: 27 A
Less than –39 °C or
greater than 88 °C
Greater than 118 °C
Less than 0 °C or
greater than 216 °C
Less than –39 °C or
greater than 88 °C
0 MPa
Detection condition
Compressor operating
Compressor operating
Compressor operating except for
10 minutes at end of defrosting
and 7 minutes while compressor
starting
Compressor operating
Compressor operating except for
10 minutes at end of defrosting
and 5 minutes while compressor
starting
Compressor operating except for
10 minutes at end of defrosting
and 7 minutes while compressor
starting
Compressor operating except for
defrosting, 10 minutes at end of
defrosting
Number of
check modes
0
1 time
1 time
2 times
1 time
1 time
2 times
Check time
–
30 minutes
30 minutes
30 minutes
30 minutes
30 minutes
30 minutes
3) Check mode is released by stopping operation, changing the operation mode, or check mode time up. A check
mode is also released by stopping of operation by remote controller.
4) Detected check mode history (newest) and abnormality history (last 2 times) are memorized and are displayed on
the segment by circuit board DIP switch setting.
The operation mode when the newest abnormality was generated, the thermistor temperature (TH1,2,3), and the
thermostat ON time can also be displayed.
(2) Compressor, 4-way valve, and crankcase heater control
1) Determines the operation mode and operates the compressor based on the indoor/outdoor communication or MNET communication data.
2) Compressor control has a function which prevents the compressor from restarting within 3 minutes.
3) The 4-way valve is always ON during heating (except during defrosting). In other modes, it is OFF. However, when
the operation mode was changed from heating to stop, the 4-way valve is turned off 10 minutes after the compressor was stopped.
4) While the compressor is stopped, the crankcase heater remains ON. (OFF while the compressor is operating.)
5) When the operation mode is changed while the compressor is operating, the compressor stops and 3 minutes later
restarts in the new mode.
–23–
Page 26
(3) Fan control
Controls the fan speed based on the piping temperature (TH1) to perform cooling at low outdoor temperatures and heating
at high outdoor temperatures.
1) Control at cooling
a) When the compressor stops, the fan stops (fan output=0%).
b) When the power is turned on, or when the compressor is restated after it has been stopped for 30 minutes or
longer, the piping temperature ( TH1) determines the fan output.
When TH ≤ 25˚C Fan output = 100 %
When TH < 25˚C Fan output = 60 %
c) When the compressor is restarted within 30 minutes after it has been stopped, the fan step before the compres-
sor was stopped is selected. However, when the fan output was under 30% when the fan was stopped, 30 % is
selected.
d) When the mode was changed from heating to cooling, the fan step conforms to item 2.
e) Two minutes after the fan is started, the fan step (number of units) is controlled every 30 seconds based on the
piping temperature (TH1).
f) When TH1 reaches 50˚C or higher, or when the control high pressure switch (63H2) tripped, the fan output
becomes 100 %.
g) Fan output while the compressor is operating is within the 20 % to 100 % range.
• FAN step
The following expression determines the next fan step count nj+1:
nj + 1 = nj + ∆nj nj: Current fan step, ∆nj: Displacement step amount
nj control
• If nj + 1 ≥ 100 % nj + 1 = 100 %
• If nj + 1 ≥ 20 % nj + 1 = 20 %
• If TH1 ≥ 50 °C or 63H2 is “OFF” nj + 1 = 100 %
FAN ∆nj Outputs are all %.
Target condensation
temperature 31 °C
20 ≤ nj < 50
50 ≤ nj 100
Current
output
t > 49 °C
5
10
t = 49
t = 46
~
t > 46
t > 43
3
4
* In the night mode, the maximum value of nj is 80%. (When TH1 < 50˚C)
Condensation temperature TH1
t = 43
t = 40
~
~
t > 40
2
2
3
2
~
t > 36
2
2
t = 36
~
t > 33
2
2
t = 33
~
t > 29
0
0
t = 29
~
t > 26
–2
–2
t = 26
~
t > 23
–2
–2
t = 23
~
t > 20
–3
–4
t≤ 20 ˚C
–5
–10
–24–
Page 27
2) Control at heating
a) When the compressor is stopped and during defrosting, the fan is stopped.
b) When the power is turned on, or when the compressor is restarted after being stopped for 30 minutes or longer,
the piping temperature (TH1) determines the fan step.
TH1 > 8˚C Fan output = 60 %
TH1 ≤ 8˚C Fan output = 100 %
c) When the compressor is restarted within 30 minutes, the fan step is the step before the compressor was stopped.
d) When the mode is changed from cooling to heating, the fan step conforms to item b).
e) When returning from defrosting, the fan step is the step before defrosting.
f) Two minutes after the fan was restarted, the fan step is controlled every 30 seconds based on the piping
temperature (TH1).
g) When TH1 is –5˚C or lower, the fan output is made 100 %.
• FAN step
The following expression determines the next fan step count nj + 1:
nj + 1 = nj + ∆nj nj: Current fan step, ∆nj: Displacement step amount
nj control
• If nj + 1 ≤ 100 % nj + 1 = 100 %
• If nj + 1 ≤ 20 % nj + 1 = 20 %
• If TH1 < –5 °C nj + 1 = 100 %
FAN ∆nj Outputs are all %.
Evaporation temperature TH1
Target evaporation
temperature 10 °C
T > 19 °C
T = 19
~
T > 17
T = 17
~
T > 15
T = 15
~
T > 13
T = 13
~
T > 11
T = 11
~
T > 8
T = 8
~
T > 6
T = 6
~
T > 4
T = 4
~
T > 2
T = 2
~
T > 0
T≤ 0˚C
20 ≤ nj + 1 ≤ 100
Current
output
–10
–4
–3
(4) Defrosting control
1) When the following conditions are satisfied, defrosting starts:
a) When the integrated compressor operation time has exceeded T
temperature (TH1) is below –10 C
b) When the integrated compressor ˚C
Piping differential temperature ∆TH1 = TH10 – TH1
2) The defrosting prohibit time T
1 is set as following based on the defrosting time T2:
T2 ≤ 3 (minutes) T1 60 (minutes)
3 < T2 < 15 40
T
2 = 15 30
Note: T
Note: When the compressor was stopped during defrosting, T1 = 20 minutes is set to recognize the stop as
defrosting end.
–2
–2
0
2
2
3
4
10
1 (initial setting 50 minutes) and the piping
Current piping temperature
Piping temperature 10 minutes after starting or
10 minutes after returning from defrosting
1 is reset at the end of defrosting, or by cooling ON command.
3) During defrosting, all the outdoor fans are stopped and the bypass solenoid valve (SV1) is turned ON and the 4-way
valve (21S4) is turned OFF.
4) When the following conditions are satisfied, defrosting ends:
a) T
2 ≤ 2 mins TH1 ≤ 30°C
b) 2 < T
2 < 15 minutes TH1 ≤ 8°C continuous 2 minutes
c) T2 =15 minutes
5) When the fan and 4-way valve (21S4) are turned ON at the end of defrosting, the heating mode is reset. Two
minutes after defrosting reset, the bypass solenoid valve (SV1) turns OFF.
–25–
Page 28
(5) Bypass solenoid valve control (SV1)
1) Control at cooling
a) While the compressor is stopped, the solenoid valve is OFF.
b) When the power is turned on, or when the compressor is restarted after it has been stopped for 30 minutes or
longer, if the liquid temperature (TH1) is 25˚C or higher then the solenoid valve turns ON for 2 minutes.
c) When the power is turned on, or when the compressor restarted after it has been stopped for 30 minutes or
longer, the solenoid valve turns ON for 5 minutes if the liquid temperature (TH1) is staying below 25˚C.
d) The item b) or c) is applied to the mode change from heating to cooling.
e) When the previous operation mode is cooling and the compressor restarted within 30 minutes after it’s stopping
by the tripping of 63H2, the solenoid valve turns ON for 2 minutes.
2) Control at heating
a) While the compressor is stopped, the solenoid valve is OFF.
b) When the power is turned on, or when the compressor restarted after it has been stopped for 30 minutes or
longer, the solenoid valve turns ON for 2 minutes if the liquid temperature (TH1) is staying above 8˚C.
c) When the power is turned on, or when the compressor restarted after it has been stopped for 30 minutes or
longer, the solenoid valve turns ON for 5 minutes if the liquid temperature (TH1) is staying below 8˚C.
d) The item b) or c) is applied to the mode change from cooling to heating.
e) When the control pressure switch (63H2) trips, the solenoid valve turns ON.
f) If 63H2 resets 15 minutes after tripping, the solenoid valve turns OFF.
g) During defrosting, the solenoid valve turns ON.
h) When the previous operation mode is heating and the compressor restarted within 30 minutes after it’s stopping
by the tripping of 63H2, the solenoid valve turns ON for 2 minutes.
i) When the previous operation mode is heating, and the compressor restarted within 30 minutes after the tripping
of 63L, the solenoid valve turns ON for 2 minutes.
(6) Electronic expansion valve (LEV)
1) Initial processing after power turned on
After the power is turned on, full close processing is performed as initial drive processing.
a) A 2200 pulses down is output from power on.
b) At the end of 2200 pulse down output, 60 pulses up is output.
c) Sixty pulses up output ends initial processing. At this point, the valves are fully closed.
2) Control contents
At compressor starting
At compressor stopping
At defrosting
Normal
3) Normal LEV control
a) The operation frequency when the compressor is started (including after defrosting reset) determines the stan-
dard opening angle.
b) After a) above, sub cool (SC) shown below controls the LEV opening angle.
<Definition of SC>
Cooling: SC = TH3 (outdoor unit)-TH1 (outdoor unit)
Heating: SC = TH5 (indoor unit)-TH2 (indoor unit)
* When there are multiple indoor units, the value of TH2 and TH5 is the average value of TH2 and TH5 of all
the indoor units.
<LEV control>
LEV is controlled so that SC is equal to SCm.
SC < SCm: LEV opening angle is made smaller
SC > SCm: LEV opening angle is made larger
SC = SCm: LEV opening angle remains unchanged
SCm = 5~15 (SCm is different with Indoor Units.)
4) Transient LEV control
a) When outlet temperature (outdoor unit TH2) rises
When the outlet temperature (outdoor unit TH2) exceeds 115 °C, the LEV opening angle is made larger.
LEV output opening angle
Initial opening angle
1000 pulses
2000 pulses (full close)
See next item
Opening angle control range
Approx. 1000 to 2000 pulses
–
–
1000 to 1500 pulses
(7) Service functions
1) Abnormality history clear
a) When DIP SW1-2 is turned ON while the compressor is operating or stopped, the abnormality history is cleared.
–26–
Page 29
[3] Function of switches and connectors (outdoor unit)
(1) Function of switches
1) Function of switches
Kind of
switch
DIP SW
Tact SW
DIP SW
DIP SW
(Normal mode)
Switch
SW1
CN33
When
open
(Normal)
SW2
SW3
SW4
SW5
Pole
1
Abnormality history clear
2
Function
None
3
4
5
Refrigerant system
address setting
6
1
2
3
Self diagnosis
4
5
6
Mode input register
1
Trial run mode switching
2
1
2
3
4
Trial run
Inlet temp. re-reading
3-phase power source
detection
Cooling only switching
Model setting
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Normal mode
SW3 = Unrelated
Operation by switch operation
ON OFF
––
Clear Normal
123456
ON
OFF
01234
123456
ON
OFF
56789
123456
ON
OFF
10 11 12 13 14
→
Shows that Nos. 3, 4, 5 , and 6 of
15
SW1 are ON.
OFF
OFF
OFF
ON
ON
ON
123456
123456
123456
See pages 29 to 34.
Register Normal
Operate Stop
Heat Cool
Do Do not
Do not Do
Cooling only Heat pump
PUH-P10MYA PUH-P8MYA
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
OFF
OFF
OFF
ON
ON
ON
123456
123456
123456
Switch effec-
tive timing
–
Running or
stopped
When power
turned on
Running or
stopped
stopped
stopped*
1
stopped
–
When power
turned on
When power
turned on
2) Switch functions at set mode change
Set input mode
2
8 °C continuous 2 minutes
Switch effec-
tive
stopped
stopped
stopped
Kind of
switch
DIP SW
Switch
SW1
When
CN33
shorted
(mode
switching)
Pole
1
2
3
4
Defrosting end switching
5
6
Function
None
Night mode
Defrosting prohibit time
switching
None
CN33 = short SW3 = ON*
Operation by switch operation
ON OFF
––
Night mode Normal mode
12 °C continuous 2 minutes
Fixed Training
––
*1 Trial run performs trail run processing by input change while stopped. (For details, see the trail run section)
*2 Mode input is entered by SW3 OFF→ON change (___↑). Press and hold down SW3 for about 2 seconds. The set
mode can be registered according to the outdoor unit setting information on page 31.
Remarks
Note: After changing the mode by CN33 shorting (mode switching), return to the normal mode by opening CN33.
3) Connector function assignment
Type
Connector
Connector
CN31
CN32
CN33
Function
Emergency operation
Function test
DIP switch mode switching
Operation by open/short
short open
Start Normal
Function mode Normal
Mode switching Normal
Switch effec-
tive timing
At initialization
At initialization
stopped
timing
–
–
–27–
Page 30
<Outdoor unit operation monitoring function>
The operation status and check code contents can be ascertained by means of the 2-digit number and symbol on digital
display light emitting diode LED2 by operating DIP switch SW2.
<Description of operation of digital display light emitting diode (LED2)>
• When ON (normal operation): Displays the operation mode.
SW2
12345 6
ON
OFF
(Load status)
LED2
[Tens digit: Operation mode]
Display Operation mode
O stopped
C Cooling/Dry
H Heating
d Defrost
ON
[Units digit: Relay output]
Display Compressor 4-way valve Bypass solenoid valve
0 –– –
1 –– ON
2 – ON –
3 – ON ON
4ON ––
5ON – ON
6ON ON –
7ON ON ON
• When blinking (Operation stopped by tripping protection device): Displays the check mode
Display Check unit
0 Outdoor unit
1 Indoor unit 1
2 Indoor unit 2
3 Indoor unit 3
4 Indoor unit 4
Display Check contents (at power on)
E8 Indoor-outdoor communication receive abnormal (outdoor unit)
E9 Indoor-outdoor communication send abnormal (outdoor unit)
EA
Eb
Indoor/outdoor connection erroneous wiring, number of indoor
units mismatch
Indoor/outdoor connection erroneous wiring (indoor unit power
failure, disconnection)
Ed Serial communication abnormal (M-NET)
E0-E7 Communication other than outdoor unit abnormal
F8 Input circuit faulty
• PUH-P8MYA/P10MYA
Display Check contents (operating)
U2 Compressor discharge temperature abnormal, CN23 short-circuit connector unplugged
U3 Compressor discharge temp thermistor (TH2) open/short
U4 Liquid temp thermistor (TH1), Condenser/evaporater temp thermistor (TH3) open/short
U6 Compressor overcurrent protection trip (51C trip)
UE High pressure protection (63H1 trip)
UL Low pressure protection (63L trip)
P1-P8 Indoor unit abnormal
A0-A8 M-NET communication abnormal
–28–
Page 31
Self diagnosis by SW2
• PUH-P8MYA/P10MYA
SW2 setting Display contents Description of display Unit
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
<Example> When –10,
°C
123456
ON
OFF
Liquid temperature
(TH1)
–39 - 88
every other second
–
←→ 10
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Discharge temperature (TH2)
0 - 216
FAN output
0 - 100
Number of compressor
ON/OFF
0 - 999
Compressor integrated operation time
0 - 999
0 - 216
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 115,
every other second
1
←→ 15
0 - 100
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 100,
every other second
1
←→ 00
0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 425,
every other second
4
←→ 25
0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 245,
every other second
2
←→ 45
°C
%
100 times
10 hours
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Current check mode
code 1
Current check mode
code 2
LEV opening angle
(/5)
0 - 400
Check mode segment display
method
Segment and bit correspondence
bit 2 bit 3
bit 1
bit 5
bit 6 bit 7
bit 4
bit 8
Check mode 1 display method
bit 1 ..... Compressor discharge temperature
abnormal
bit 2 ..... Compressor discharge temp thermistor
abnormal (TH2)
bit 3 ..... CN23 short-circuit connector un-
plugged
bit 5 ..... Liquid temp thermistor abnormal (TH1)
Check mode 2 display method
bit 1 ..... Overcurrent trip (Comp)
bit 2 ..... Low pressure protection
0 - 400
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 200 ,
every other second
2
←→ 00
–29–
5 pulses
Page 32
SW2 setting Display contents Description of display Unit
When no check mode,“00”
<Example> When piping thermistor abnormal U4
Code display
123456
ON
OFF
Newest check code
Newest outdoor unit
abnormality
Check display
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Operation mode when
abnormality occurred
Liquid temperature
(TH1) when abnormality occurred
– 39 - 88
COMP discharge
temperature (TH2)
when abnormality
occurred
0 - 216
Check code history (1)
(newest)
Abnormal unit No. and
check code inverted
display
Operation mode when abnormally stopped
<Example> Comp. only ON at cooling operation C4
–39 - 88
(When 0 °C or lower, “–” and temperature are displayed
alternately.)
<Example> When –15,
every other second
–
←→ 15
0 - 216
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 130,
every other second
1
←→ 30
When no abnormality history
“0”, “←→”, “–”
Code display
°C
°C
Code display
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Check code history (2)
(One before newest)
Abnormal unit No. and
check code inverted
display
Current thermostat
ON time
0 - 999
Number of indoor
units connected
0 - 4
When no abnormality history
“0”, “←→”, “–”
0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 245,
every other second
2
←→ 45
0 - 4
Code display
Minutes
Units
–30–
Page 33
SW2 setting Display contents Description of display Unit
123456
ON
OFF
Outdoor unit set
information 1
Outdoor unit capacity is displayed as function code.
Model name function code
PUH-P8MYA 20
PUH-P10MYA 25
Code display
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Outdoor unit set
information 2
Indoor unit piping
temperature (TH2)
Indoor 1
–39 - 88
Indoor unit piping
temperature (TH2)
Indoor 2
–39 - 88
Indoor unit piping
temperature (TH2)
Indoor 3
–39 - 88
Outdoor unit set information 1 Function setting (display valves)
3-phase power source detection Do (1) Do not (0)
Cooling only switching Cooling only (2) H/P (0)
Tens digitUnits digit
Night mode Night mode (1) Normal mode (0)
Defrosting end time
Defrosting prohibit time Fixed (4) Training (0)
Set information display values are added and displayed at each position.
12 °C continuous 2 minutes
(2)
8 °C continuous 2 minutes
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
(0)
Code display
°C
°C
°C
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Indoor unit piping
temperature (TH2)
Indoor 4
–39 - 88
Indoor intake temperature
8 - 39.5
Indoor set temperature
17 - 30
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
8 - 39.5
When there are no indoor units, “00” is displayed.
17 - 30
When there are no indoor units, “00” is displayed.
°C
°C
°C
–31–
Page 34
SW2 setting Display contents Description of display Unit
Indoor unit control
Control mode display system
status
123456
ON
OFF
123456
ON
OFF
Indoor 1, 2
Indoor unit control
status
Indoor 3, 4
Indoor unit No.2
Indoor unit No.4
Indoor unit No.1
Indoor unit No.3
Display
0
1
2
3
4
Freeze prevention
5
6
Compressor OFF
7
Control mode
Indoor unit
Ordinary
Hot adjustment
Defrosting
—
Heater ON
Surge prevention
Outdoor unit
←
←
←
←
←
←
←
←
–
–
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Condenser/evaporater
temperature (TH3)
Outdoor unit control
status
Discharge super heat
SHd
0 - 216
Cooling: Outdoor TH2 -
Outdoor TH3
Heating: Outdoor TH2
- Indoor TH3
(Average)
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
<Example> When –10,
every other second
–
←→ –10
Control mode display system
Indoor unit No.2
Indoor unit No.4
Indoor unit No.1
Indoor unit No.3 Outdoor unit
Display
0
1
2
3
4
5
6
7
Freeze prevention
Surge prevention
Compressor OFF
Control mode
Indoor unit
Ordinary
Hot adjustment
Defrosting
—
Heater ON
Outdoor unit
←
←
←
←
←
←
←
←
0 - 216
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 150,
every other second
1
←→ 50
°C
–
°C
123456
ON
OFF
123456
ON
OFF
Sub cool Sc
0 - 130
Cooling: Outdoor TH3
- Outdoor
TH1
Heating: Indoor TH3
(Average) Indoor TH2
(Average)
Target sub cool step N
1 - 5
0 - 130
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 100,
every other second
1
←→ 00
1 - 5
–32–
°C
–
Page 35
SW2 setting Display contents Description of display Unit
0 - 255
When communication demand not set: 100 %
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
123456
ON
OFF
Communication demand capacity
0 - 255
<Example> When 100,
every other second
1
←→ 100
%
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Abnormal thermistor
display
1 - 3, –
FAN output at abnormal stop
0 - 100
LEV opening angle (/5)
at abnormal stop
0 - 400
Outdoor Condenser/
evaporater temp temperature at abnormal
stop
–39 - 88
1 - 3, –
1: Outdoor liquid temp thermistor (TH1)
2: Outdoor discharge temp thermistor (TH2)
3: Outdoor condenser/evaporater temp thermistor (TH3)
–: No abnormal thermistor
0 - 100
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 100,
every other second
–
←→ 00
0 - 400
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 200,
every other second
2
←→ 00
–39 - 88
(When 0 °C or lower, “–”and temperature are displayed
alternately.)
<Example> When –10,
every other second
–
←→ –10
–
%
5 pulses
°C
123456
ON
OFF
123456
ON
OFF
Discharge super heat
SHd at abnormal stop
0 - 216
Cooling: Outdoor TH2-
Outdoor TH3
Heating: Outdoor TH2-
Indoor TH3
(average)
Sub cool Sc at abnormal stop
0 - 130
Cooling: Outdoor TH3-
Outdoor TH1
Heating: Indoor TH3
(average) -Indoor TH2 (average)
0 - 216
(When 100 °C or higher, 100s digit and 10s and units
digits are displayed alternately.)
<Example> When 150,
every other second
–
←→ 50
0 - 130
(When 100 °C or higher, 100s digit and 10s and units
digits are displayed alternately.)
<Example> When 100,
every other second
1
←→ 00
°C
°C
–33–
Page 36
SW2 setting Display contents Description of display Unit
0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 245,
Minutes
123456
ON
OFF
Thermostat ON time up
to abnormal stop
0 - 999
every other second
2
←→ 45
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
LEV regular control
count n
1 - 5
Indoor unit condenser/
evaporater temp temperature (TH3)
Indoor 1
–39 - 88
Indoor unit condenser/
evaporater temp temperature (TH3)
Indoor 2
–39 - 88
Indoor unit condenser/
evaporater temp temperature (TH3)
Indoor 3
–39 - 88
1 - 5
–39 - 88
(When 0 ˚C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
–39 - 88
(When 0 ˚C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
–39 - 88
(When 0 ˚C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
–
˚C
˚C
˚C
123456
ON
OFF
Indoor unit condenser/
evaporater temp temperature (TH3)
Indoor 4
–39 - 88
–39 - 88
(When 0 ˚C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.
˚C
–34–
Page 37
[4] Simple parts check method
• PUH-P8MYA/P10MYA
Part name
Thermistor (TH1) <Liquid
temperature detection>
Thermistor (TH2)
<Dischargetemperature
detection>
Thermistor (TH3) <Condenser/
evaporater temperature
detection>
Fan motor
Thermal protector
trip temperature
135 ± 5˚C : ON
88 ± 5˚C : OFF
White
Red
Black
Blue
Compressor
Judgment instructions
Disconnect the connector and measure the resistance value with a multimeter.
(Ambient temperature 10 ˚C to 30 ˚C)
TH1, 3
TH2
Normal
4.3 kΩ~9.6 kΩ
160 kΩ~410 kΩ
Abnormal
Open or short
(Based on thermistor characteristic table (next page))
Measure the resistance value across the terminals with a multimeter. (Winding
temperature 20 ˚C)
Motor lead wire
Between 2 phases
Normal
45.5 Ω
Abnormal
Open or short
Measure the resistance value across the terminals with a multimeter. (Winding
temperature 20 ˚C)
Normal
PUH-P8MYA
Each phase 1.574 Ω
PUH-P10MYA
Each phase 1.263 Ω
Abnormal
Open or short
Open or short
–35–
Page 38
[5] Reference Data
<Thermistor characteristic table>
Low temperature thermistor Thermistor <Liquid temperature detection> (TH1)
Thermistor <Condenser/evaporater temperature detection> (TH3)
Thermistor <Liquid temperature detection> (TH1)
Thermistor <Condenser/evaporater temperature detection> (TH3)
Thermistor Ro = 15 kΩ ± 3 %
B constant = 3,460 kΩ ± 2 %
Rt = 15 exp {3,460 (–––––– – ––––)}
11
273 + t 273
50
<Low temperature thermistor>
0 °C: 15 kΩ
40
10 °C: 9.7 kΩ
20 °C: 6.4 kΩ
25 °C: 5.3 kΩ
30
30 °C: 4.3 kΩ
40 °C: 3.1 kΩ
Resistance
20
10
0
—20 —10 10 20 30 40 500
High temperature thermistor Thermistor <Discharge temperature detection> (TH2)
Thermistor (Discharge temperature detection) (TH2)
Thermistor R120 = 7.465 kΩ ± 2 %
B constant = 4,057 kΩ ± 2 %
Rt = 7.465 exp {4,057 (–––––– – ––––)}
11
273 + t 393
25
Temperature
<High temperature thermistor>
20 °C: 250 kΩ 70 °C: 34 kΩ
30 °C: 160 kΩ 80 °C: 24 kΩ
40 °C: 104 kΩ 90 °C: 17.5 kΩ
50 °C: 70 kΩ 100 °C: 13.0 kΩ
60 °C: 48 kΩ 110 °C: 9.8 kΩ
20
15
Resistance
10
5
0
90 100 110 120
Temperature
–36–
Page 39
[6] Troubleshooting of each part
(1) LEV
1) Overview of LEV operation
LEV (electronic expansion valve) receives pulse signals from the outdoor unit main circuit board and drives a valve
by means of a servomotor.
The valve opening angle changes in proportion to the number of pulses.
<Outdoor controller board and LEV>
Blue
Brown
Yellow
White
Red
Orange
Output (phase)
No.
ø1
ø2
ø3
ø4
1234
ON OFF OFF ON
ON ON OFF OFF
OFF ON ON OFF
OFF OFF ON ON
Output state
LEV opening and closing operations
Brown
Red
Blue
Yellow
White
Connector
Outdoor controller board CN40
Drive circuit
<Pulse signal output and valve operation>
The output pulses change in the following order:
Valve closing 1 → 2 → 3 → 4 → 1
Valve opening 4 → 3 → 2 → 1 → 4
*1. When the LEV opening angle is not changed, all output
phases turn OFF.
2. When the output misses a phase or remains ON, the motor cannot rotate smoothly and makes a clacking sound
and vibrates.
* When the power is turned on, to register the valve posi-
D
C
tion, a 2200 pulses valve close signal is output and is always set to point A .
Valve closing
Valve opening
Valve opening angle (flow)
A
E
B
Increased throttling region (80 - 100 pulses)
If the valve moves smoothly, the LEV will not generate a sound
or vibration, but at E → A and when the valve is locked, a
sound louder than the sound generated by missing phase,
etc. will be generated.
* Generation of sound can be checked by placing the tip of
a screwdriver against the valve and your ear against the
handle.
Full open
2000 pulses
Pulse count
–37–
Page 40
2) Judgment method and probable trouble mode
Trouble mode
Microcomputer drive circuit faulty
LEV mechanism locked
LEV motor coil open or
shorted
Connector connection incorrect, or contact faulty
Judgment method
(1)Disconnect the control circuit board connector, and con-
nect the check LED shown below.
When the mains power is turned on, a pulse signal is output for 10 seconds.
If the LED remains OFF or ON, the drive circuit is abnormal.
(1)When the LEV is in the locked state and driven, the mo-
tor races. At this time, a soft clicking sound is generated.
When this sound is generated both when closing and
when opening, the mechanism is abnormal.
Measure the resistance between the coils (red-white, redorange, brown-yellow, brown-blue) with a multimeter.
If 150 Ω±10 %, the coil is normal.
(1)Visually check for loose connector terminals and check
the color of the lead wires.
(2) Disconnect the control circuit board connector and
check the continuity with a multimeter.
Remedy
When drive circuit is faulty, replace control circuit board.
Replace LEV
Replace LEV coil
Check continuity of faulty point
3) Electronic expansion valve motor replacement instructions
1. Description of construction
1.1 A lock nut connects the motor to the valve body.
1.2 The motor consists of a motor rotating section, rotation
transmission gear section, and a driver which converts
rotation to linear motion.
1.3 The valve body consists of a valve assembly, which
moves up and down, and an orifice.
A bellows at the top of the valve body block isolates the
Bellows
Refrigerant
circuit
Motor
Driver
Lock nut
Valve assembly
Valve body
Orifice
refrigerant circuit from the atmosphere side.
Therefore, the motor is not exposed to the refrigerant.
2. Principle of operation
2.1 Pulses output from the control circuit board are sequentially supplied to four coils and the motor is rotated.
The motor can be rotated in either clockwise or counterclockwise by changing the order in which the pulses are
supplied.
2.2 The gear section reduces the motor speed to 1/30 and supplies the motor rotation to the motor output shaft.
2.3 The motor output shaft is threaded and is used as a driver.
2.4 The up and down motion of the end of the driver moves the valve assembly of the valve body up and down and
controls the flow by changing the distance between the orifice and the bottom end of the valve.
–38–
Page 41
3. Work precautions
3.1 Do not apply abnormal force to the motor.
3.2 Do not use a motor that has been dropped.
3.3 Do not remove the cap until immediately before starting work.
3.4 Do not wipe off the molybdenum.
3.5 Do not remove the packing.
3.6 Do not coat the lock nut with a substance other than
Motor
Packing
Molybdenum
Cap
the specified lock tight, grease, etc.
4. Replacement instructions
4.1 Stop the air conditioner from the remote controller. After confirming that the air conditioner has stopped, turn off
the outdoor unit power.
4.2 Get two wrenches. Hold the flat part of the body with one wrench and loosen the lock nut with the other wrench.
The lock nut loosens when turned counterclockwise as viewed from the motor.
Always use two wrenches.
Do not hold the motor with one hand and try to loosen the lock nut with only one wrench.
4.3 When the lock nut is turned several turns, it will disengage from the threads and the motor can be removed.
4.4 Get the replacement motor. The replacement motor is limited to a motor whose driver end position has been
set at the factory for replacement use. (The driver end of factory set parts does not stick out.)
Use of a motor whose driver end position is not set is related to erroneous valve flow control or no operation.
4.5 During replacement work, be sure that dirt, foreign matter, or water does not enter the part where the motor
and valve body separate.
(Since the part exposed by separation corresponds to the mechanical part of the valve.) Do not damage the
connecting part with the tools. After removing the motor, 1
blow out the body bellows section with N2 gas, etc.
to remove the water clinging to the inside and 2 after fan stop processing of the pertinent unit in the motor
removed state, dry the bellows section by performing the cooling operation for 30 minutes.
4.6 Remove the cap of the replacement motor and butt the bottom of the motor against the top of the valve body
and hold it so that both are aligned and connect the motor to the valve body with the lock nut.
Coat the entire
periphery of the threaded part with screw lock. Be sure that the screw lock does not enter the interior.
If a defect occurs during replacement work, do not use the motor, instead use a new replacement motor.
4.7 After tightening the lock nut 2 to 3 turns by hand, hold the flat part of the body with one wrench and tighten to
the prescribed torque with a torque wrench. Tighten to a torque of 15N·m (150 kgf·cm) (Control value 15 ± 1N·m
(150 ± 10 kgf·cm))
If tightened too tight, the flare nut may break during use.
4.8 When tightening the lock nut, hold the motor with your hand, etc. so that strong rotation torque and bending
load are not applied.
4.9 The difference of the relative positions of the motor and body after assembly has no affect on the valve control
and open/close mechanism.
Do not try to forcefully position the motor and valve body to correct “displacement” after tightening of the lock
nut due to the difference in the positional relationship between the motor and valve body before and after
assembly.
Fixing with the clip may be impossible due to motor section defor-
Rotation direction
“displacement” is OK.
mation, but fixing of the piping is sufficient and fixing by clip is unnecessary.
4.10 Connect the connector. At this time, be sure not to pull the lead
wires forcefully. Also, firmly insert the connector up to the lock and
check that it cannot not be easily disconnected.
4.11 Turn on the outdoor unit power and operate the air conditioner from
the remote controller and confirm that there are no abnormalities.
–39–
Page 42
[7] Emergency operation
1) When the following check displays occur at the outdoor unit, or when the wired remote controller or indoor unit
microcomputer fails, if there are no other defects, emergency operation is possible by shorting the connector (CN31)
on the outdoor controller board.
• Abnormalities that allow emergency operation
Display Check contents
U4
E8 Indoor-outdoor communication receive abnormal (outdoor unit)
E9 Indoor-outdoor communication send abnormal (outdoor unit)
E0 - E7 Communication other than outdoor unit abnormal
2) Check items and precautions when performing emergency operation
a) In addition to the abnormalities above, check the outdoor unit for any abnormalities. (When there is an abnor-
mality other than the above, emergency operation is impossible.)
b) Check the operating range. (For U4 display)
Since the outdoor fan always operates at full speed at emergency operation, do not operate the air conditioner
outside the range shown below.
Cooling geater than 20 °C
Heating less than 10 °C
c) When performing emergency operation, set the outdoor unit after setting the emergency operation switch (SWE)
on the indoor controller board. For the indoor emergency operation method, refer to the indoor unit wiring
diagram.
d) A power failure causes emergency operation to become continuous operation. ON/OFF, temperature adjust-
ment and other operations cannot be performed from the remote controller.
(When a PEH-P8MYA or P10MYA indoor unit is connected, check that the special indoor unit power is turned
on, then start emergency operation.)
e) Since cool air is discharged from the indoor unit, when the outdoor unit starts the defrosting operation during
heating emergency operation, do not operate the air conditioner for a long time.
f) You can perform cooling emergency operation up to 10 hours. The indoor unit heat exchanger may freeze.
g) At the end of emergency operation, always return the switch settings, etc. to their original state.
Liquid temp thermistor (TH1) open or shorted
Condenser/evaporater temp thermistor (TH3) open or shorted
Operation range (outdoor unit intake temperature)
Operation outside this range may cause compressor trouble.
3) Emergency operation contents
a) The operation mode operates according to the contents set (cooling or heating) by SW4-2.
b) The fan operation condition is always 100 % operation.
c) The operation mode display flashes every other second.
–40–
Page 43
4) Emergency operation method
Start
Piping work complete?
NO
* Before starting, recheck that the trouble allows
YES
Check that mains power is OFF
Turn on emergency operation switch
(SWE) on indoor controller board
Short CN31 (emergency operation
connector) on outdoor controller board
Set operation mode (cooling or heating) with SW4-2 on outdoor board
(SW4-1 not used)
SW4
OFF ON
1
Cooling Heating
2
emergency operation.
Turn on indoor power *1
Turn on mains power
Check that emergency operation starts,
and that operation mode display flashes
5) Emergency operation release method
a)
Turn off mains power. (Outdoor, indoor)
*1
b)
Turn off emergency operation switch
(SWE) on indoor controller board
c)
Open CN31 (emergency operation
connector) on outdoor controller board
d)
Set SW4-2 as shown below
SW4
*1 Only when PEH-P8MYA or P10MYA indoor unit
connected.
e)
Turn on mains power
OFF ON
1
2
*1. When PEH-P8MYA or P10MYA indoor unit is
connected, first turn off the outdoor unit power,
then turn off the indoor unit power.
–41–
Page 44
[8] Self-diagnosis and troubleshooting
<Abnormality detected at power on>
Abnormality display
None
EA
Eb
Meaning of abnormality display and
abnormality troubleshooting
Indoor/outdoor connection erroneous wiring, too many indoor
units (5 or more)
1. Outdoor controller board automatically recognizes the number of
connected indoor units. However,
when the number of connected indoor units cannot be set due to erroneous indoor/outdoor connection, erroneous wiring, etc. even
after 4 minutes have elapsed since
the power was turned on, an abnormality is recognized.
2. When the outdoor controller board
identified “5 or more” connected indoor units, an abnormality is recognized.
Indoor/outdoor connection erroneous wiring
The outdoor controller board automatically sets the unit No. of the indoor units. However, when the unit
No. of the indoor units cannot be set
due to indoor/outdoor connection erroneous wiring even after 4 minutes
has elapsed since the power was
turned on, an abnormality is recognized.
Cause
(1) Voltage not applied to outdoor unit ter-
minal block TB1.
a. Power supply circuit breaker not
closed.
b. Power supply terminals connection
faulty, or disconnected.
c. Missing phase (R or S phase)
(2) No electricity at controller board power
supply connector.
a. Power supply connector contact
faulty.
b. Terminal R/1 or S/2 on controller
board disconnected.
(3) Outdoor unit controller board faulty.
a. Blown fuse on controller board.
b. Part faulty.
(1) Indoor/outdoor connection wire con-
tact faulty or erroneous wiring.
(2) Indoor/outdoor connection wire diam-
eter or wiring length outside specification.
(3) Five or more indoor units connected
to outdoor unit.
(4) Outdoor controller board send/receive
circuit faulty.
(5) Indoor controller board send/receive
circuit faulty.
(6) Noise has entered on power supply
or indoor/outdoor connection wire.
(1) Indoor/outdoor connection wire con-
tact faulty, or erroneous wiring.
(2) Indoor/outdoor connection wire diam-
eter or wiring length outside specification.
(3) Outdoor controller board send/receive
circuit faulty.
(4) Indoor controller board send/receive
circuit faulty.
(5) Noise has entered on power supply
or indoor/outdoor connection wire.
Judgment method and remedy
(1)
a. Check power supply circuit breaker.
b. Check power supply terminal block
connections.
c. Check power supply terminal block
connections.
(2)
a. Check power supply connector board
connections.
(3)
a. Replace fuse.
b. Replace controller board.
(However, when cannot be repaired
even through the check above was
carried out.)
(1) Check if indoor unit or outdoor unit in-
door/outdoor connection wire disconnected or loose. Also check polarity.
(2) Check indoor/outdoor wire diameter
and wiring length.
Outdoor-indoor: Max. 50 m
Indoor-indoor (span): Max. 30 m
Also check that VVF and other flat
cables are connected in S1, S2, S3 order. (S2 in the middle)
(3)Check number of indoor units con-
nected to outdoor unit.
(4) Check by turning power off and on.
If abnormality is displayed again, replace outdoor controller board or indoor
controller board.
* LED3 of the indoor controller board
flashes when communication is being
performed.
Start-up time over
When start-up processing does not
end even through 4 minutes has
EC
elapsed since the power was turned
on, an abnormality is recognized.
F1
Reverse phase detected
F2
Missing phase detected
(1) Indoor/outdoor connection wire con-
tact faulty.
(2) Indoor/outdoor connection wire diam-
eter or wiring length outside specification.
(3) Noise has entered on power supply
or indoor/outdoor connection wire.
Power supply reverse phase connection.
Power supply missing phase.
–42–
(1)Check power supply terminal block
connections.
(2) Replace controller board
(However, when cannot be repaired
even though check above was carried
out.)
Page 45
<Abnormality detected during unit operation: Outdoor unit>
Abnormality display
U2
U3
Meaning of abnormality display and
abnormality troubleshooting
Discharge temperature abnormal
When the discharge thermistor temperature (TH2) exceeds 118 °C while
the compressor is operating, an abnormality is recognized.
49C trip (CN23 connector disconnected)
When connector CN23 opens while
the compressor is operating, an abnormality is recognized.
Discharge temp thermistor (TH2)
open or shorted.
When an open (0 °C or lower) or
short (216 °C or higher) is detected
while the compressor is operating, an
abnormality is recognized.
(Detection is disabled for 5 minutes
at compressor starting.)
Cause
(1) Compressor overheating due to insuf-
ficient refrigerant.
(2) Thermistor faulty. (TH2)
(3) Outdoor controller board faulty.
(1) Shorting connector CN23 on outdoor
controller board dislodged or contact
faulty.
(1) Connector (CN3) dislodged or con-
nect faulty.
(2) Thermistor faulty.
(3) Outdoor controller board faulty.
Judgment method and remedy
(1) Check input super heat.
Check for refrigerant leakage and
check piping length.
Charge with additional refrigerant.
(2)(3)
Turn off power and restart operation
and check if U3 is displayed within 8
minutes.
When U3 is displayed, carry out U3 processing.
(Do not replace board at U2 display
only.)
(1) Repair shorting connector.
(1)Check connector contact and ther-
mistor wire.
(2) Check thermistor resistance value, or
check temperature by microcomputer.
(Check using SW2 self-diagnosis function.)
See page 36.
(3) Replace outdoor controller board.
(Replace board after sufficiently checking 1 and 2.)
Liquid temp thermistor (TH1) or
condenser/evaporater temp thermistor (TH3) open or shorted.
When an open (–39 °C or lower) or
short (88 °C or higher) is detected
while the compressor is operating, an
U4
abnormality is recognized. (Detection
is disabled for 7 minutes beginning
from 10 seconds after the compressor starts and for 10 minutes after
return from defrosting.)
Compressor overcurrent trip
When the current value reaches the
overload set value or higher while the
compressor is operating, an abnormality is recognized.
U6
P8MYA .................................. 22 A
P10MYA ................................ 27 A
High pressure abnormal (63H1
trip)
Detected (3.3+0
while compressor is operating.
UE
-0.15
63H1: Pressure switch (high pres-
sure)
OFF: 3.3 MPa
MPa) by 63H1 trip
(1) Connector (TH1: CN2, TH3: CN4) dis-
lodged or contact faulty.
(2) Thermistor faulty.
(3) Outdoor controller board faulty.
(1) Overload operation exceeding unit us-
age range limit.
(2) Power supply terminal voltage low.
(3) Power supply missing phase.
(4) Compressor motor faulty.
(5) Compressor locked.
(6) Connector (CN22) on outdoor control-
ler board dislodged or contact faulty.
(7) 51C disconnected or contact faulty.
(1) Started with ball valve closed.
(2) Connector (CN21) on outdoor control-
ler board dislodged or contact faulty.
(3) 63H1 disconnected or contact faulty.
(4) Indoor filter clogged. Power reset de-
tected during heating overload opera-
tion (Heating).
(5) Low indoor unit air flow (heating).
(6) Low outdoor unit air flow (cooling).
(7) Part faulty.
(1)Check connector contact and ther-
mistor wire.
(2) Check thermistor resistance value or
check temperature by microcomputer.
(Check using SW2 self-diagnosis function.)
See to page 36.
(3) Replace outdoor controller board.
(Replace board after sufficiently checking 1 and 2)
(1) Check usage conditions.
(Check for short cycle operation.)
(2) Check power supply voltage.
(3) Check wiring for breaks and faulty con-
tact.
(4) Check motor winding resistance (See
page 35.)
(5) Replace compressor.
(6)(7)
After checking connections, restart and
check operation.
(1) Check if ball valve is fully open.
(2)(3)
Repair connector.
(4) Check indoor filter.
(5) Check flow duct static pressure and for
faulty fan motor.
(6) Check for faulty outdoor fan motor.
(7) Replace pressure switch.
–43–
Page 46
Abnormality display
Meaning of abnormality display and
abnormality troubleshooting
Cause
Judgment method and remedy
UL
EO
E3
Low pressure abnormal (63L trip)
Detected by tripping of 63L while the
compressor is operating. (Ignored
during defrosting and for 10 minutes
at defrosting return.)
63L: Pressure switch (low pressure)
OFF: 0 MPa
Remote controller communications receive abnormal (remote
controller).
1) When transmission from refrigerant address “0” IC is not received
normally even once in 3 minutes,
an abnormality is recognized.
2) When a slave remote controller
does not receive even one signal
in 2 minutes, an abnormality is
recognized.
Remote controller communication
send abnormal (remote controller)
1) When the remote controller can
not confirm that the transmission
circuit is idle in 6 seconds, an abnormality is recognized.
2) When the remote controller cannot complete 30 continuous transmissions, an abnormality is recognized.
(1) Started with ball valve closed.
(2) Connector (CN27) on outdoor control-
ler board open or contact faulty.
(3) 63L disconnected or contact faulty.
(4) Part faulty.
(1) Remote controller send/receive
circuit faulty.
(2) Refrigerant address “0” indoor control-
ler board send/receive circuit faulty.
(3) Noise entered on remote controller
transmission line.
(1) Remote controller send/receive circuit
faulty.
(2) Noise entered on remote controller
transmission line.
(1) Check if ball valve fully open.
(2)(3) Repair connector.
(4) Replace pressure switch.
Perform remote controller diagnosis.
Take the following action based on the diagnosed result:
a) [RC OK] display
Remote controller normal.
Turn power off and on and check.
If “H0” remains on for 4 minutes or
longer, replace indoor controller board.
b) [RC NG] display
Replace remote controller.
c) [RC E3] display
[ERC00-66]
Noise, etc. probable
cause.
Indoor-outdoor communication
receive abnormal
(Outdoor unit)
E8
When the outdoor controller can
not receive normally even once in
3 minutes, an abnormality is recognized.
Indoor-outdoor communication
send abnormal
(Outdoor unit)
1) When the outdoor controller
detectes reception of 30 consecu-
E9
tive “0” even through “1” was received, an abnormality is recognized.
2) When the outdoor controller can
not confirm that the transmission
circuit is idle in 3 minutes, an error is recognized.
Check code undefined
Displayed when an undefined check
EF
code is received.
(1) Indoor/outdoor connection wire con-
tact faulty.
(2) Outdoor controller board send/receive
circuit faulty.
(3) Indoor controller board send/receive
circuit faulty.
(4) Noise entered on indoor/outdoor con-
nection wire.
(1) Outdoor controller board send/receive
circuit faulty.
(2) Noise entered at power supply.
(3) Noise entered on indoor/outdoor con-
nection wire.
(1) Noise entered on remote controller
transmission line.
(2) Noise entered on indoor/outdoor con-
nection wire.
(1) Check for disconnected or loose indoor
unit or outdoor unit indoor/outdoor connection wire.
(2)-(4)
Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor controller board.
(1)(2)(3)
Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor controller board.
(1)(2)
Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor controller board.
–44–
Page 47
<Abnormality detected during unit operation: Indoor unit>
Abnormality display
P1
P2
Meaning of abnormality display and
abnormality troubleshooting
Intake sensor abnormal
1) If thermistor open or short is detected and the compressor enters
the 3 minutes restart prevention
mode and does not return to normal after 3 minutes, an abnormality is recognized.
(If returned, returns to normal operation.)
2) Always detected during cool, dry,
and heat operations.
Short: 90 °C or higher
Open: –40 °C or lower
Piping sensor abnormal
1) If thermistor short or open is detected and the compressor enters
the 3 minutes restart prevention
mode and does not return to normal after 3 minutes, an abnormality is recognized.
(If returned, returns to normal operation.)
2) Always detected during cool, dry,
and heat (except during defrosting) operation.
Short: 90 °C or higher
Open: –40 °C or lower
Cause
(1) Thermistor characteristics faulty.
(2) Connector contact faulty.
(Insertion faulty)
(3)Thermistor wiring open or contact
faulty.
(4) Indoor controller board faulty.
(1) Thermistor characteristics faulty.
(2) Connector contact faulty.
(Insertion faulty)
(3)Thermistor wiring open or contact
faulty.
(4)Faulty refrigerant circuit, etc. has
caused thermistor temperature to rise
to 90 °C or higher or drop to –40 °C
or lower.
(5) Indoor controller board faulty.
Judgment method and remedy
(1)-(3)
Check thermistor resistance value
0 °C ...... 15.0 kΩ
10 °C ........ 9.7 kΩ
20 °C ........ 6.4 kΩ
30 °C ........ 5.3 kΩ
40 °C ........ 3.1 kΩ
Open or faulty contact can be detected
by applying force (pulling, bending) to
lead wire while measuring thermistor
resistance.
(2) Check for connector faulty contact.
After reinserting connector, turn on
power and recheck operation.
(4) Check remote controller room tempera-
ture display.
If there is a difference between actual
room temperature and displayed room
temperature after checking that there
are no problems at (1)-(3), replace indoor controller board.
If there are no problems above, there
are no abnormalities.
Turn power off and on and operate.
(1)-(3)
Check thermistor resistance value.
For characteristic, see above (P1).
(2) Check for connector faulty contact.
After reinserting connector, turn on
power and recheck operation.
(4) Operate in trail run mode and check
piping temperature with remote controller. When piping temperature is abnormally low (cooling) or high (heating),
refrigerant circuit is probably faulty.
(5) Check test run mode piping tempera-
ture with remote controller.
If there is a difference between actual
piping temperature and displayed piping temperature when there are no abnormalities at (1)-(4), replace indoor
controller board. If there is no problem
above, there are no abnormalities.
Turn on power and operate.
Drain sensor abnormal
1) If thermistor short or open continuously detected for 30 seconds, the
compressor enters the check
mode and turns off and the indoor
fan turns off.
2) When another short or open is
P4
continuously detected for 30 seconds in the check mode, an abnormality is recognized.
(If returned, returns to normal operation.)
3) Always detected during cool, dry,
and drain pump operation.
Short: 90 °C or higher
Open: –20 °C or lower
(1) Thermistor characteristics faulty.
(2) Connector contact faulty.
(Insertion faulty)
(3) Drain sensor wiring open or contact
faulty.
(4) Indoor controller board faulty.
–45–
(1)-(3)
Check thermistor resistance value.
0 °C .... 6.0 kΩ
10 °C .... 3.9 kΩ
20 °C .... 2.6 kΩ
30 °C .... 1.8 kΩ
40 °C .... 1.3 kΩ
(2) Check connector for faulty contact.
After reinserting connector, turn on
power and recheck operation.
(4) If abnormality reproduced by shorting
between drain sensor connector CN31
pins 1 and 2 and operating air conditioner, replace indoor controller board.
If there are no problems above, there
are no abnormalities.
Turn on power and operate.
Page 48
<Abnormality detected during unit operation: Indoor unit>
Abnormality display
P5
Meaning of abnormality display and
abnormality troubleshooting
Drain overflow protection operation
1) When the drain sensor thermistor
overheats and the temperature
rise is small, the compressor enters the check mode and is turned
off and the indoor fan is turned off.
2) If the state above is detected again
in the check mode, drain pump
abnormality is recognized.
3) Always detected during drain
pump operation.
Water leakage abnormality (PDH
only)
1) When the drain sensor thermistor
overheats and the temperature
rise is small, the compressor enters the check mode and the drain
pump is turned on for 6 minutes.
(Detection: 1 time/hour)
2) If the state above is detected
again within 12 hours after the
check mode was entered, a water leakage abnormality is recognized.
3) Detected during stop, fan, and
heat operation.
Cause
(1) Drain pump trouble.
(2) Drain faulty.
Drain pump clogged.
Drain pipe clogged.
(3) Water droplets on drain sensor.
Drain water waves created by transmission of drain water from lead wire,
clogged filter, etc.
(4) Indoor controller board faulty.
(1) Water leaking from humidifier water
supply pipe.
(2) Water droplets on drain sensor.
(3) Indoor controller board faulty.
Judgment method and remedy
(1) Check drain up mechanism.
(2) Check drain characteristic.
(3) Check drain sensor lead wire arrange-
ment and check for filter clogging.
(4) If abnormality reproduced by shorting
between drain sensor connector CN31
pins 1 and 2 and operating air conditioner, replace indoor controller board.
If there are no problems above, there
are no abnormalities.
Turn on the power and operate.
(1) Repair water leakage.
(2) Check drain sensor lead wire arrange-
ment and check for filter clogging.
(3) If abnormality reproduced by shorting
between drain sensor connector CN31
pins 1 and 2 and operating air conditioner, replace indoor controller board.
If there are no problems above, there
are no abnormalities.
Turn on power and operate.
Freezing/excessive rise protection
operation
1) Freezing protection
When the piping temperature remains at –15 °C or lower for 3 minutes after 3 minutes have elapsed
since the compressor started, the
compressor enters the 6 minutes
restart prohibit mode and if the
piping temperature again remains
at –15 °C for 3 minutes within 16
P6
minutes after 6 minutes restarting,
an abnormality is recognized.
2) Excessive rise protection
When a piping temperature rise
to 70 °C or higher is detected after the compressor starts, the
compressor enters the 6 minutes
restart prohibit mode. If a piping
temperature rise up to 70 °C or
higher is detected again within 10
minutes after 6 minutes restarting,
an abnormality is recognized.
<Cool and dry>
(1) Filter is clogged (insufficient air flow).
(2) Air duct short cycle.
(3) Low load operation (low temperature)
exceeding allowable range.
(4) Indoor fan motor faulty.
(5) Outdoor fan control faulty (intermedi-
ate period, winter).
(6) Refrigerant overcharged.
(7) Refrigerant circuit faulty (clogged).
<Heat>
(1) Filter clogged (insufficient air flow)
(2) Air duct short cycle.
(3) Overload operation (high tempera-
ture) exceeding allowable range.
(4) Indoor fan motor faulty.
(5) Outdoor fan control faulty (intermedi-
ate period)
(6) Refrigerant overcharged.
(7) Refrigerant circuit faulty (clogged)
(8) Outdoor unit bypass circuit faulty.
<Cool and dry>
(1) Check filter for clogging.
(2) Remove obstruction.
(4) Check fan motor operation and wind-
ing resistance.
(5) Check outdoor fan motor operation.
(6)(7)
Check refrigerant circuit operation.
<Heat>
(1) Check filter for clogging.
(2) Remove obstruction.
(4) Check fan motor operation and wind-
ing resistance.
(5) Check outdoor fan motor operation.
(6)-(8)
Check refrigerant circuit operation.
–46–
Page 49
<Abnormality detected during unit operation: Indoor unit>
Abnormality display
P8
Meaning of abnormality display and
abnormality troubleshooting
Piping temperature abnormal
<Cool>
When the piping temperature stays
outside the cooling area for 1 minute
after 3 minutes have elapsed since
the compressor was started, the indoor fan operates at low speed. If the
piping temperature does not return
to the cooling area after 5 minutes
operation at low speed, an abnormality is recognized.
Note 1) It takes a minimum of 9 min-
utes for an abnormality to be
detected.
Note 2) At dry operation, P8 abnor-
mality is not detected.
<Heat>
When the piping temperature falls
outside the heating area and enters
the ventilation area after compressor
operation and the end of hot adjust,
the indoor fan stops and the piping
temperature does not return to the
heating area within 20 minutes after
10 seconds have elapsed after it left
the heating area, an abnormality is
recognized.
Note 3) It takes a minimum of 22
minutes and a maximum of
27 minutes for an abnormal-
ity to be detected.
Note 4) Except during defrosting
(Detected again after de-
frosting return.)
Cause
(1) Indoor intake piping thermistor tem-
perature differential small.
- EInsufficient refrigerant
- EPiping thermistor holder dislodged.
- ERefrigerant circuit faulty.
(2) Extension piping (When multiple units
connected).
(3)Indoor/outdoor connection wire
(When multiple units connected).
(4) Indoor intake piping thermistor detec-
tion faulty.
Judgment method and remedy
(1) Operate in test run mode and check
piping temperature.
(2)(3)
Check extension piping or indoor/outdoor connection wire.
(4) Check remote controller room tempera-
ture display and piping temperature in
test run mode.
Remote control communication receive abnormal
1) When the indoor controller board
can not receive data normally
from the remote controller or another indoor controller board even
once in 3 minutes, an abnormal-
E4
ity is recognized.
2) When the indoor controller board
can not receive signals even once
in 2 minutes, an abnormality is
recognized.
(1) Remote controller transmission line
contact faulty.
(2) All remote controllers set as “slave”
remote controller.
(3) Remote controller send/receive circuit
faulty.
(4) Indoor controller board send/receive
circuit faulty.
(5) Noise entered on remote controller
transmission line.
(1) Check if indoor unit or remote control-
ler transmission line disconnected or
loose.
(2) Set one remote controller as “master”.
When there are no problems at the
above
(3) Perform remote controller diagnosis.
a) [RC OK] display
Remote controller normal.
Check by turning power off and on.
If the abnormality occurs again, replace
indoor controller board.
b) [RC NG] display
Replace remote controller.
c) [RC E3] display
[ERC00-66] noise, etc. is probable
cause.
–47–
Page 50
<Troubleshooting and repair by symptom>
Symptom and operation when normal
Cause
Symptom judgment and remedy
1. No remote controller display
2. Remote controller displays “H0” unchanged.
3. When remote controller operation
switch pressed, operation display
appears but immediately disappears.
(1) DC14 V is not supplied to remote con-
troller.
(No power O display on liquid crystal
panel.)
(2) DC14V is supplied to remote controller
but nothing is displayed.
- “H0” not displayed
- “H0” displayed
(1)Remote controller displays “H0” for
maximum of 2 minutes for starting after
power turned on.
(2) Indoor-remote controller communication
faulty.
(3) Outdoor-indoor communication faulty.
(1) Operation switch is disabled for approxi-
mately 30 seconds after function select
operation from remote controller is released.
(1) Check LED2 on indoor controller board.
1)Steady light
Check remote controller wire open or faulty
contact.
2)Flashing
Check for remote controller wire short.
3)Not lit
Check outdoor controller refrigerant address.
(2) Make the following judgment:
- When “H0” is not displayed, remote controller is faulty.
- When “H0” is displayed, see item 2.
(1) Normal operation.
(2) Remote controller self-diagnosis.
(3) When outdoor-indoor cannot communicate
“H0” is displayed for a maximum 6 minutes.
Check LED3 on indoor controller board.
1) Does not flash
Check indoor/outdoor connection cable for
erroneous wiring.
(S1 and S2 or S3 open)
2) Flashes
Indoor/outdoor connection cable is normal.
(1) Normal operation.
4. Does not beep and air conditioner
does not operate even when operated with wireless remote controller.
(Operation display appears on wireless remote controller.)
5. When operated with wireless remote controller, beeps but does not
operate.
6. Remote controller display is normal
and cooling operation is performed,
but without any capacity (does not
cool).
(1) Wireless remote controller and indoor
controller board pair number setting mismatched.
(2) Cause of item 1.
(1) Air conditioner does not operate for a
maximum of 2 minutes after the power
is turned on.
(2) Set to local operation prohibit mode.
- Remote start/stop adapter is connected to CN32 on indoor controller
board.
- Air conditioner is connected to
MELANS and is set to local operation
prohibit mode from centralized controller, etc.
(3) Cause of item 2.
(1) Insufficient refrigerant.
(2) Filter clogged.
(3) Outdoor unit heat exchanger clogged.
(4) Air duct short cycle.
(5) Outdoor unit bypass circuit faulty.
(1) Check pair number setting.
(2) Item check of item 1.
(1) Normal operation.
(2) Normal operation.
(3) Item check of item 2.
(1) - When there is leakage, discharge tempera-
ture rises. Therefore, check by measuring
temperature.
- Check for gas leakage from piping connections, etc.
(2) Open intake grille and check filter. Clean filter,
and remove dust and dirt.
(3) - Since both indoor piping temperature and
outlet pressure rise when filter clogged, judge
by measuring outlet pressure.
- Clean heat exchanger.
(4) Remove obstruction.
(5) Check refrigerant circuit operation state.
–48–
Page 51
Symptom and operation when normal
Cause
Symptom judgment and remedy
7. Remote controller display is normal
and heating operation is performed
but without any capacity (does not
heat).
(1) Insufficient refrigerant.
(2) Refrigerant piping heat insulation insuf-
ficient.
(3) Filter clogged.
(4) Indoor unit heat exchanger clogged.
(5) Air duct short cycle.
(6) Outdoor unit bypass circuit faulty.
(1) - Since the discharge temperature rises when
there is leakage, judge by measuring the temperature.
- Check piping connections, etc. for gas leakage.
(2) Check heat insulation.
(3) Open intake grille and check filter.
Clean filter, and remove dust and dirt.
(4) - Since the indoor piping temperature and out-
let pressure rise when the heat exchanger is
clogged, judge by measuring the outlet pressure.
- Clean heat exchanger.
(5) Remove obstruction.
(6) Check refrigerant circuit operation state.
–49–
Page 52
<Indoor/outdoor connection wire erroneous wiring and open symptoms>
Remote control-
ler display
“ ” Power
supply mark
No display
No display
No display
Eb
No display
No display
No display
No display
No display
No display
No display
No display
No display
No display
No display
Eb
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
side
S1
S2
S3
Condition
Trial run
(relocation)
Trial run
relocation
Trial run
relocation
Trial run
relocation
Trial run
relocation
Trial run
relocation
Trial run
relocation
Trial run
relocation
Trial run
relocation
Erroneous wiring contents Remarks
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Outdoor
side
S1
S2
S3
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor
Indoor controller board
LED display
LED1
On
Off
Off
On
On
Off
Off
On
Off
On
Off
Off
Off
Off
Off
On
On
LED2
On
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
LED3
Flashing
Outdoor controller
board LED display
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
(after 4 minutes)
OO
EA
Eb
EA
Eb
EA
Eb
EA
Eb
EA
Eb
EA
Eb
EA
Eb
EA
Eb
Normal
wiring
Open
between S1
Open
between S2
Open
between S3
–50–
Page 53
8 Test run
(1) Test run (For PUH-P8MYA/P10MYA)
The test run can be carried out either from the outdoor unit or the indoor unit.
1. Check list
• After the installation, piping setup, and wiring of the indoor and outdoor units is complete, check that refrigerant is not
leaking, the power and control wires are not loose, and the poles are not reversed. (When connecting model PEH-P-YE
in particular, check that there is current in the separate power supply cable for the indoor unit.)
• Use a 500 V insulation resistance tester to make sure that the resistance between the power terminal and the ground is
1.0 MΩ or more. If it is less than 1.0 MΩ, do not operate the unit. * Absolutely do not touch the tester to indoor/outdoor
connection terminals S1, S2, and S3. An accident could occur.
• Make sure there is no malfunction in the outdoor unit. (If there is a malfunction, you can diagnose it using LED2 on the
board.)
• Check that the ball valve is fully open on both the liquid and gas ends.
• Check the electrical power phase. If the phase is reversed, the fan may rotate in the wrong direction or stop, or unusual
sounds may be produced.
• Starting at least 12 hours before the test run, send current through the crankcase heater. (If the current is running for a
shorter period of time, damage to the compressor could result.)
After the above checks are complete, carry out the test run as indicated in the following outline.
2. Starting and finishing the test run
• Procedure from the indoor unit: carry out the test run as in the manual provided with the indoor unit.
• Procedure from the outdoor unit: start and stop the test run and set test run mode (cooling/heating) using the SW4 dip
switches on the board.
a) Set test run mode (cooling/heating) using SW 4-2.
b) The test run will begin when SW 4-1 is turned ON, according to the mode selected by SW 4-2.
c) The test run is stopped when SW 4-1 is turned OFF.
<SW4>
ON
stop
1
2
cooling
OFF
run
heating
Note:
Test run mode cannot be stopped during operation by using SW 4-2. (If the operation mode is to be changed, first
stop it using SW 4-1, then after changing the operation mode, start the test run again using SW 4-1.)
• If the 2-hour timer is set, the test run will stop automatically after 2 hours.
• During the test run, the room temperature display on the indoor unit will indicate the temperature of the indoor unit piping.
–51–
Page 54
(2) How to handle problems with the test run (For PUH-P8MYA/P10MYA)
Error code list: details
Error details
Remote controller communication – reception error
Remote controller communication – transmission error
Remote controller communication – reception error
Remote controller communication – transmission error
Communication between indoor and outdoor units – reception error
Communication between indoor and outdoor units – transmission error
Communication between indoor and outdoor units – reception error
Communication between indoor and outdoor units – transmission error
Indoor/outdoor connection wiring error, indoor unit overload (5 units or
more)
Indoor/outdoor connection wiring error (interference, loose)
Excessive time in use
Serial communication error
Serial communication error
Reverse phase, out of phase verification
Faulty input circuit
Duplicated M-NET address setting
M-NET error in PH/W transmission
M-NET bus busy
M-NET communication error with P transmission
M-NET error – no ACK
M-NET error- no response
Undefined error code
Outlet temperature error
CN23 Short-circuit Connector Unplugged
Open/short in discharge temp thermistor
Open/short in liquid temp or condenser/evaporater temp thermistor
Compressor overcurrent interruption (51C operation)
High pressure error (63H1 operation)
Low pressure error (63L operation)
Power synchronous idle circuit error
Inlet sensor error
Piping sensor error
Drain sensor error
Drain overflow protector operation
Water leak error (PDH only)
Freeze prevention operation
Surge prevention operation
Piping temperature error
Problem location
Remote Controller
Remote Controller
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
M-NET board
Outdoor unit
Outdoor unit
M-NET board
M-NET board
M-NET board
M-NET board
M-NET board
M-NET board
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
–
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
MELANS
display
6831,6834
6832,6833
6831,6834
6832,6833
6740,6843
6841,6842
6840,6843
6841,6842
6844
6845
6846
0403
0403
4103
4115
6600
6602
6603
6606
6607
6608
undefined
1102
1108
5104
5105
4101
1302
1300
4115
5101
5102
2503
2502
2500
1503
1504
1110
Remote control-
ler display
E0
E3
E4
E5
E6
E7
E8
E9
EA
EB
EC
ED
EE
F1
F8
A0
A2
A3
A6
A7
A8
EF
U2
U2
U3
U4
U6
UE
UL
F8
P1
P2
P4
P5
P5
P6
P6
P8
–52–
Page 55
• Depending on the position of the SW2 switch on the outdoor unit board, the segments light up to indicate the running condition of the
unit and the particulars of the check code.
SW2 setting
123456
000000
011110
010110
110110
Item
Operation mode/relay output
Outdoor unit control condition
Indoor unit control
condition
Indoor unit control
condition
(IC1)
(IC2)
(IC3)
(IC4)
Display contents
tens place O: stop
C: cooling
H: heating
d: defrosting
units place 1: SV1 Relay output = SV1 + 21S4 + 52C
2: 21S4
4: 52C
Ex. During cooling mode, when 52C and
SV1 are ON: C5
When an error occurs, the error
code and error signal (*1) are
displayed in alternation.
Control mode display system
Indoor unit No.2
Indoor unit No.4
Indoor unit No.1
Indoor unit No.3
Outdoor unit
Display
0
1
2
3
4
5
6
7
Freeze prevention
Surge prevention
Compressor OFF
Control mode
Indoor unit
Ordinary
Hot adjustment
Defrosting
—
Heater ON
Outdoor unit
←
←
←
←
←
←
←
←
011100
111100
Error code history 1
Error code history 2
*1 Display system for error indicator
The indicator corresponds to the following numbers
0 .......... Outdoor unit
1 .......... Indoor unit No.1
2 .......... Indoor unit No.2
3 .......... Indoor unit No.3
4 .......... Indoor unit No.4
The error code (ex. U8, UA) and error indicator (*1) are displayed in alternation.
–53–
Page 56
Certificate Number FM33568
Certificate Number EC97J1227
Registered on March 10, 1998
HEAD OFFICE MITSUBISHI DENKI BLDG. MARUNOUCHI TOKYO 100-0005 TELEX J24532 CABLE MELCO TOKYO
The Air Conditioning & Refrigeration Systems Works acquired ISO 9001 certification under
Series 9000 of the International Standard Organization (ISO) based on a review of quality
warranties for the production of refrigeration and air conditioning equipment.
ISO Authorization System
The ISO 9000 series is a plant authorization system relating to quality warranties as stipulated by the ISO. ISO 9001 certifies quality warranties based on the “design, development,
production, installation and auxiliary services” for products built at an authorized plant.
The Air Conditioning & Refrigeration Systems Works acquired environmental management
system standard ISO 14001 certification.
The ISO 14000 series is a set of standards applying to environmental protection set by the
International Standard Organization (ISO). ISO 14001 certifies the plant’s environmental
protection system and activities.
MEE03K185
Printed in Malaysia
Specifications subject to change without notice.
New publication, effective Jul. 2003.
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