Mitsubishi Electric PUZ-A42NHA5-BS, PUZ-A42NHA5, PUY-A42NHA5, PUY-A42NHA5-BS Service Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT -TYPE, AIR CONDITIONERS
Outdoor unit
April 2012
No.OCH512
SERVICE MANUAL
[Model names]
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
[Service Ref.]
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
R410A
Note:
• This manual describes
only service data of the
outdoor units.
•
RoHS compliant products
have <G> mark on the
spec name plate.
PUZ-A42NHA5
PUY-A42NHA5
CONTENTS
1. REFERENCE MANUAL ·································2
2. SAFETY PRECAUTION ·································2
3. FEATURES ·····················································6
4. SPECIFICATIONS ·········································· 7
5. DATA ·······························································8
6. OUTLINES AND DIMENSIONS ··················· 11
7. WIRING DIAGRAM ······································ 12
8. WIRING SPECIFICATIONS ··························13
9.
REFRIGERANT SYSTEM DIAGRAM
10. TROUBLESHOOTING ··································20
11. EASY MAINTENANCE FUNCTION·············· 72
12. FUNCTION SETTING ···································75
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER
13.
14. DISASSEMBLY PROCEDURE ·····················93
PARTS CATALOG (OCB512)
·············18
·····83
1
OCH512
REFERENCE MANUAL
INDOOR UNIT
Model name Service Ref. Service manual No.
PLA-A42BA4 PLA-A42BA4 OCH482
OCB482
PCA-A42KA5 PCA-A42KA5.TH OCH501
OCB501
PEAD-A42AA4 PEAD-A42AA4
HWE0905A
2 SAFETY PRECAUTION
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
Preparation before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off the power-supply beaker.
• Discharge the condenser before the work involving the electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be done without turning off the power,
exercise great caution not to touch the live parts.
2
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
OCH512
Cautions for units utilizing refrigerant R410A
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the followings.
· Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
Contamination inside refrigerant piping can cause deterioration of refrigerant oil etc.
Store the piping to be used indoors during
installation, and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Tools for R410A
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Flare tool
Size adjustment gauge
Vacuum pump adaptor
Electronic refrigerant
charging scale
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause deterioration of refrigerant oil etc.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Use the specified refrigerant only.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
3
[1] Cautions for service
OCH512
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Unit
Gravimeter
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1
Gauge manifold · Only for R410A
· Use the existing fitting
· Use high-tension side pressure of 5.3MPa·G or over.
2
Charge hose · Only for R410A
· Use pressure performance of 5.09MPa·G or over.
3
Electronic scale
4
Gas leak detector · Use the detector for R134a, R407C or R410A
5
Adaptor for reverse flow check · Attach on vacuum pump.
6
Refrigerant charge base
7
Refrigerant cylinder · Only for R410A ·Top of cylinder (Pink)
· Cylinder with syphon
8
Refrigerant recovery equipment
specifications
—
—
—
.
4
2-3. CAUTIONS FOR REFRIGERANT PIPING WORK
OCH512
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is
same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the
working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
1 Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7 mm [7/256 inch] or below.)
Diagram below: Piping diameter and thickness
Nominal
dimensions[inch]
1/4
3/8
1/2
5/8
3/4
Outside
diameter
6.35
9.52
12.70
15.88
19.05
(mm)
Thickness
R410A R22
0.8 [1/32]
0.8 [1/32]
0.8 [1/32]
1.0 [5/128]
—
2 Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because of its working pressure is higher than that of other
refrigerants. Therefore, to enhance air tightness and intensity, flare cutting dimension of copper pipe for R410A has
been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for
R410A also has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
: mm [inch]
0.8 [1/32]
0.8 [1/32]
0.8 [1/32]
1.0 [5/128]
1.0 [5/128]
Dimension A
Dimension B
Flare cutting dimensions
Nominal
dimensions[inch]
1/4
3/8
1/2
5/8
3/4
Outside
diameter
6.35
9.52
12.70
15.88
19.05
Dimension A
R410A R22
9.1 [11/32-23/64]
13.2 [1/2-33/64]
16.6 [41/64-21/32]
19.7 [49/64-25/32]
—
Unit : mm [inch]
+0
( )
-0.4
9.0
13.0
16.2
19.4
23.3
Flare nut dimensions
Nominal
dimensions[inch]
1/4
3/8
1/2
5/8
3/4
Outside
diameter
6.35
9.52
12.70
15.88
19.05
3 Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials Use R410A tools Can R22 tools be used?
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermistor vacuum gauge and
vacuum valve
Charging cylinder
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
Air purge, refrigerant charge
and operation check
Gas leak check
Collection of refrigerant
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refrigerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and
alkylbenzene oil(minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adopter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools can be used for other refrigerants
Tools can be used for other refrigerants
Tools can be used for other refrigerants
Tools can be used for other refrigerants
Tools can be used for other
refrigerants
Tool exclusive for R410A
(Usable if equipped
with adopter for rever se flow)
(Usable by adjusting
flaring dimension)
Unit : mm [inch]
Dimension B
R410A R22
17.0 [43/64]
22.0 [7/8]
26.0 [1-3/64]
29.0 [1-9/64]
—
17.0
22.0
24.0
27.0
36.0
5
3 FEATURES
OCH512
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
CHARGELESS SYSTEM
PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.
(Max. 100ft, 30m)
The refrigerant circuit with LEV (Linear Expansion Valve) and accumulator always control the optimal refrigerant level
regardless of the length (100ft, 30m max. and 16ft, 5m min.) of piping. The additional refrigerant charging work during
installation often causes problems.
It is completely eliminated by chargeless system. This unique system improves the quality and reliability of the work done.
It also helps to speed up the installation time.
6
4 SPECIFICATIONS
OCH512
Service Ref. PUZ-A42NHA5
Power supply Phase
MCA A
MOCP A
Breaker size A
External finish
Heat exchanger
Defrost method
Crankcase heater
Compressor
Fan Fan(drive)% No.
Sound level Cooling dB 51
Protection devices
Dimension W mm
Weight kg 114
Refrigerant
Refrigerant Pipe size OD mm 9.52
piping Liquid in. 3/8
Cycle
Voltage
kW
Model
Motor output kW
R.L.A.
L.R.A.
Starter type
Fan motor output
Fan motor
Airflow m
Heating dB
Dmm
Hmm
W in.
D in. 13 + 1-3/16
H in. 53-5/32
Charged kg 4.5
Control Linear expansion valve
Oil Model
Charged L 1.4
Pipe size OD mm 15.88
Gas in. 5/8
Connection method Indoor Flared
Connection method Outdoor Flared
Height difference m Max. 30
IU - OU ft Max. 100
Piping length m Max. 50
kW
F.L.A.
3
/min
CFM
lbs 251
lbs 10
oz 45
ft Max. 165
PUZ-A42NHA5-BS
Single
60Hz
208/230V
26
40
30
Munsell 3Y 7.8/1.1
Plate fin coil
Reverse cycle
-
Hermetic
ANB33FCTMT
2.5
20
27.5
Inverter
Propeller fan % 2
0.086 + 0.086
0.40 + 0.40
100
3530
55
HP switch
Comp. shell thermo
950
330+30
1350
37-12/32
R410A
Ether(FV50S
PUY-A42NHA5
PUY-A42NHA5-BS
–
112
247
)
7
5
OCH512
DATA
5-1. REFILLING REFRIGERANT CHARGE (R410A : oz, kg)
Service Ref. 50ft 60ft 70ft 80ft 90ft 100ft 110ft 120ft 130ft 140ft 150ft 160ft 165ft
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
15m 18m 21m 24m 27m 30m 33m 37m 40m 43m 46m 49m 50m
132 oz 136 oz 142 oz 148 oz 154 oz 160 oz 166 oz 172 oz 178 oz 184 oz 190 oz 196 oz 202 oz 160 oz
3.7 kg 3.9 kg 4.0 kg 4.2 kg 4.4 kg 4.5 kg 4.7 kg 4.9 kg 5.0 kg 5.2 kg 5.4 kg 5.6 kg 5.7 kg 4.5 kg
Piping Length (one way
)
Longer pipe than 70 or 100 ft,additional charge is required.
5-2. COMPRESSOR TECHNICAL DATA
PUZ-A42NHA5
Service Ref.
Compressor model ANB33FCTMT
Winding Registance
()
U-V 0.302
U-W 0.302
W-V 0.302
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
(
at 20°C,68°F
)
Factory
Charged
PUZ-A42NHA5
PUZ-A42NHA5-BS
PUY-A42NHA5
PUY-A42NHA5-BS
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
10
63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
MODE
COOLING
HEATING
SPL(dB)
51
55
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
MICROPHONE
3.3ft
UNIT
5ft
GROUND
8
5-3. STANDARD OPERATION DATA
OCH512
5-3-1. Heat pump
Representative matching
Mode
Total Capacity BTU/h
Input W
Indoor unit model
Phase
Cycle
Voltage
Current
Outdoor unit model
Electrical circuit
Phase
Cycle
Voltage
Current
Discharge pressure MPa
Suction pressure MPa
Discharge temperature
Condensing temperature
Suction temperature
Ref. Pipe length m
Discharge pressure PSIG
Suction pressure PSIG
Refrigerant circuit
Discharge temperature °F
Condensing temperature °F
Suction temperature °F
Ref. Pipe length ft 25 25
Intake air temperature DB 26.7 21.1
Indoor
Intake air temperature WB 19.4 15.6
side
Discharge air temperature DB 12.9 41.9
Intake air temperature DB 35 8.3
Outdoor
side
Intake air temperature WB 23.9 6.1
Intake air temperature DB °F 80 70
Indoor
Intake air temperature WB °F 67 60
side
Discharge air temperature DB °F 55 107
Intake air temperature DB °F 95 47
Outdoor
side
Intake air temperature WB °F 75 43
SHF 0.71
BF
COOLING HEATING
42,000 45,000
4,600 4,450
1.00A 0.94A
20.4A
2.83
0.82
73.4
47.5
4.9
7.6
410
120
164
118
40
PLA-A42BA4
PLA-A42BA4
Single
60Hz
230V
PUZ-A42NHA5
Single
60Hz
230V
21.5A
2.93
0.69
80.3
47.5
0.3
7.6
425
100
177
118
33
–
–0.15
9
5-3-2. Cooling only
OCH512
Representative matching
Mode
Total Capacity BTU/h
Input W
Indoor unit model
Phase
Cycle
Voltage
Current
Outdoor unit model
Electrical circuit
Phase
Cycle
Voltage
Current
Discharge pressure MPa
Suction pressure MPa
Discharge temperature
Condensing temperature
Suction temperature
Ref. Pipe length m
Discharge pressure PSIG
Suction pressure PSIG
Refrigerant circuit
Discharge temperature °F
Condensing temperature °F
Suction temperature °F
Ref. Pipe length ft 25
Indoor
side
Outdoor
side
Indoor
side
Outdoor
side
SHF 0.71
BF 0.15
Intake air temperature DB 26.7
Intake air temperature WB 19.4
Discharge air temperature DB
Intake air temperature DB 35
Intake air temperature WB 23.9
Intake air temperature DB °F 80
Intake air temperature WB °F 67
Discharge air temperature DB °F
Intake air temperature DB °F 95
Intake air temperature WB °F 75
PLA-A42BA4
COOLING
42,000
4,600
PLA-A42BA4
Single
60Hz
230V
1.00A
PUY-A42NHA5
Single
60Hz
230V
20.4A
2.83
0.82
73.4
47.5
4.9
7.6
410
120
164
118
40
12.9
55
10
6
OCH512
OUTLINES AND DIMENSIONS
PUZ-A42NHA5 PUZ-A42NHA5-BS Unit: mm<inch>
PUY-A42NHA5 PUY-A42NHA5-BS
417<16-13/32>
19<3/4>
2-U Shaped notched hole
(Foundation Bolt M10<W3/8>)
175<6-7/8>
600<23-5/8>
Rear Air Intake
175<6-7/8>
Piping and wiring connections
can be made from 4 directions:
front, right, rear and below.
4 PIPING-WIRING DIRECTIONS
<Foundation bolt height>
Please secure the unit firmly
with 4 foundation (M10<W3/8>)
bolts. (Bolts and washers must
3 FOUNDATION BOLTS
be purchased locally.)
<5-29/32>
150mm
Min.
Dimensions of space needed
for service access are
shown in the below diagram.
370<14-9/16>
56<2-7/32>
45<1-25/32>
330<13>30<1-3/16>
Side Air Intake
FOUNDATION
<1-3/16>
30mm
Min.
<19-11/16>
500mm
Min.
2 SERVICE SPACE
Min.
10mm<3/8>
42<1-21/32>
66<2-5/8>
Air Discharge
Min.
500mm
<19-11/16>
Service space
28<1-3/32>
53<2-3/32>
2-12%36 Oval hole
(Foundation Bolt M10<W3/8>)
Left···Power supply wiring
Terminal Block
950<37-13/32>
Earth terminal
322<12-11/16>
Handle
Side Air Intake
Rear Air Intake
Handle
Right····Indoor/Outdoor wiring
Service panel
Handle
Handle
Handle
1076<42-3/8>
635<25>
1350<53-5/32>
1
2
Air intake
* 1 447<17-19/32>
Front piping cover
* 1 443<17-7/16>
23<29/32>
371<14-19/32>
When installing the conduit.
Rear piping cover
Set the attachment to the
inner side of each panel.
Conduit hole
(2-:27<1-1/16>Knockout)
Bottom piping hole
71<2-13/16>
71<2-13/16>
1/2 Conduit attachment
2-:22.2<7/8>
Conduit hole
(2-:27<1-1/16>Knockout)
Rear trunking hole
40<1-9/16>
45<1-25/32>
Right trunking hole
(Knockout)
40<1-9/16>
75
<2-31/32>
Right piping hole
(Knockout)
45<1-25/32>
(Knockout)
219<8-5/8>
(Knockout)
55<2-3/16>
63<2-1/2>
63<2-1/2>
92<3-5/8>
73<2-7/8>
<2-1/2>
63
55<2-3/16>
40<1-9/16>
74<2-19/32>
:92
<3-5/8>
73<2-7/8>
:92
<3-5/8>
27<1-1/16>
Drain hole
5-:33<1-5/16>
145
<5-23/32>
145
<5-23/32>
145
<5-23/32>
220
<8-21/32>
81<3-3/16>
30<1-3/16>
31<1-7/32>
Rear piping hole
(Knockout)
92<3-5/8>
65<2-9/16>
27<1-1/16>
23<29/32>
92<3-5/8>
55<2-3/16>
19<3/4>
73<2-7/8>
23<29/32>
23<29/32>
27<1-1/16>
Min. 10mm
<3/8>
FREE
The diagram below shows a
basic example.
Explanation of particular details are
1 FREE SPACE (Around the unit)
given in the installation manuals etc.
<3/8>
Min. 10mm
Min. 150mm
<5-29/32>
<39-3/8>
Min. 1000mm
····Refrigerant GAS pipe connection (FLARE):15.88<5/8>
····Refrigerant LIQUID pipe connection (FLARE): 9.52<3/8>
Example of Notes
*1 ····Indication of STOP VALVE connection location.
11
:92
(Knockout)
<3-5/8>
65<2-9/16>
92<3-5/8>
Front piping hole
(Knockout)
40<1-9/16>
Conduit hole
(2-:27<1-1/16>Knockout)
Piping Knockout Hole Details
Front trunking hole
7
OCH512
WIRING DIAGRAM
PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS
[LEGEND]
SYMBOL
TB1
MC
MF1,MF2
21S4
63H
TH3
TH6
TH7
TH8
Terminal Block<Power Supply, Indoor/Outdoor >
Motor for Compressor
Fan Motor
Solenoid Valve (Four-Way Valve)
High Pressure Switch
Thermistor<Outdoor Pipe>
Thermistor<Outdoor 2-Phase Pipe>
Thermistor<Outdoor>
Thermistor<Heatsink>
TH32 Thermistor<Shell>
LEV-A
DCL
Electronic Expansion Valve
Reactor
CY1, CY2 Capacitor
ACTM
CB
P.B.
TABU/V/W
Active Filter Module
Main Smoothing Capacitor
Power Circuit Board
Connection T erminal<U/V/W -Phase>
MF1
MS
3~
MF2
MS
3~
NAME SYMBOL NAME SYMBOL NAME
1
1
(WHT)
CNS
C. B.
3
2
1
31
CNF1
(WHT)
7
CNF2
(WHT)
7
CNDC
(PNK)
TABS/T
TABP1/P2/P
TABN1/N2/N
DS2, DS3
IPM
N.F.
LI/LO
NI/NO
EI, E2
52C
C.B.
F1~F4
SW1
SW4
SW5
SW6
TH7TH6 TH3TH32
t° t° t°t°
412121
TH7/6
TH3
TH32
(RED)
(WHT)
(BLK)
CN2
(WHT)
TRANS
F2
CNAC
(WHT)
F1
21
43
71
7
F3
F4
Connection T erminal<L1/L2-Phase>
Connection T erminal<DC Voltage>
Connection T erminal<DC Voltage>
Diode Bridge
Power Module
Noise Filter Circuit Board
Connection Lead<L1-Phase>
Connection Lead<L2-Phase>
Connection T erminal<Ground>
52C Relay
Controller Circuit Board
Fuse<T6.3AL250V>
Switch<
Forced Defrost, Defect History Record
Reset, Refrigerant Address>
Switch<Test Operation>
Switch<Function Switch>
Switch<Model Select>
63H
LEV-A
63H
(YLW)
31
+2 PUZ only
M
LEV-A
(WHT)
LED2
CN4
(WHT)
12
2
X52
13 13
21S4
(GRN)
21S4
61
LED1
3
31
CNVMNT
CNMNT
(WHT)
(WHT)
1
CNM
(WHT)
CN52C
(RED)
5
14
221
51
X51
SS
(WHT)
SW5SW8SW4SWP
+1+1
SW6SW1
CN31
CN3S
(WHT)
(WHT)
CNDM
CN51
(WHT)
SW7
SW8
SW9
SWP
CN31
LED1,LED2
SS
CNM
CNMNT
CNVMNT
CNDM
CN3S
CN51
X51,X52
When M-NET adapter is connected
5
SW7
SW9
31
ABS
3151
Switch<Function Setup>
Switch<Function Setup>
Switch
Switch<Pump Down>
Connector<Emergency Operation>
LED<Operation Inspection Indicators>
Connector<Connection for Option>
Connector<A-Control Service Inspection Kit>
Connector<Connected to Optional M-NET Adapter Board>
Connector<Connected to Optional M-NET Adapter Board>
Connector< Connected for Option (Contact Input)>
Connector< Connected for Option>
Connector< Connected for Option (Signal output)>
Relay
5
SW11
SW1
CN5
(WHT)
1
LED2
SW12
LED3
LED4
M-NET ADAPTER
2
CND
1
CN2M
(WHT)
(WHT)
31
LED1
LED5
3
TB7
M-NET
M-NET ADAPTER
SYMBOL
TB7
CN5
CND
CN2M
SW1
SW11
SW12
LED1
LED2
LED3
LED4
LED5
Terminal Block<M-net connection>
Connector<Transmission>
Connector<Power Supply>
Connector<M-NET communication>
Switch<Status of communication>
Switch<Address setting : 1st digit>
Switch<Address setting : 2nd digit>
LED<Power Supply : DC5V>
LED<Connection to Outdoor Unit>
LED<Transmission : Sending>
LED<Transmission : Receiving>
LED<Power Supply : DC12V>
NAME
N. F.
BLU
WHT
LO
NO
1
2
CN52C
E2
1
2
CN5
EI
(BLK)
(RED)
OFF
OFF
2
ON
ON
2
123456
123456
SW5-5.6
ON
OFF
7878123456
ON
OFF
123456
+2
52C
P. B.
4
1
CNAF
(WHT)
6
7
1
IPM
CN2
(WHT)
RED
TABP2
7
TH8
1
CN3
2
(WHT)
t°
2
1
CN5
2
(RED)
2
1
CN4
2
(WHT)
WHT
TABN
CB
TABP
RED
TABV
TABU
WHT
RED
UVW
M
3~
BLK
CNDC
(PNK)
2
1
3
TABN1
TABW
BLK
MC
DCL
BLK
L1
L2
ACTM
DS3
DS2
BLK
4
WHT
16
N1
N2
TABT
BLU
YLW
GRN
S1 S2 S3
INDOOR
UNIT
3
1
CNAC2
3
1
CNAC1
ORN
(RED)
(WHT)
LI NI
CY1
CY2
BRN
TB1
+1. MODEL SELECT
The black square (■) indicates a switch position.
MODEL SW6
PUZ-A42NHA5
TABS
WHT
TABP1
RED
TABN2
WHT
BLU
RED
REDRED
P
WHT
Io
L1 L2 GR
POWER SUPPLY
208 / 230V 60Hz
+Use copper supply wires.
PUY-A42NHA5
+2. SW5-1 to 4 : Function switch
12
8
OCH512
WIRING SPECIFICATIONS
8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application)
The following connection patterns are available.
The outdoor unit power supply patterns vary on models.
1:1 System Simultaneous twin system
L1
L2
GR
S1
S2
S3
S1
S2
S3
1
2
L1
L2
GR
S1
S2
S3
S1
S1
S2
S2
S3
S3
1
1
2
2
* Affix a label A that is included with the manuals near each wiring diagram for the indoor and outdoor units..
Outdoor unit power supply
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cords
Remote controller
Indoor unit
Indoor unit earth
Indoor unit model
Indoor unit power supply
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Outdoor unit model
Outdoor unit power supply
Breaker size
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Outdoor unit power supply
%
Outdoor unit power supply earth
Indoor unit-Outdoor unit *2
size
Wiring
Indoor unit earth *2
Wire No.
Remote controller-Indoor unit *3
Outdoor unit L1-L2 *4
Indoor unit-Outdoor unit S1-S2 *4
Indoor unit-Outdoor unit S2-S3 *4
rating
Circuit
Remote controller-Indoor unit *4
*1. Use earth leakage breaker (NV).
*2. Max. 45 m, 147 ft
If AWG13 used, Max. 50 m, 164 ft.
If AWG13 used and S3 separated, Max. 80m, 262ft.
*3. The 10 m, 30 ft wire is attached in the remote controller accessory. Max. 1500 ft
*4. The figures are NOT always against the ground.
S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulated by the transformer or other device.
*1
PLA-A42
PCA-A42
–
2A
15A
A42
Single, 208/230V, 60 Hz
30A
26A
40A
2 % Min. AWG 10
1 % Min. AWG 10
3 % AWG 16 (polar)
1 % Min. AWG 16
2 % AWG 22 (Non-polar)
AC 208/230 V
AC 208/230 V
DC 24 V
DC 12 V
PEAD-A42
–
3.50A
15A
Caution: Be sure to install N-Line. Without N-Line, it could cause damage to the unit.
1.Wiring size must comply with the applicable local and national code.
Notes:
2.Use copper supply wires.
3.Use wires rated 600V or more for the power supply cables and the indoor/outdoor unit connecting cables.
4.Install an earth longer than other cables.
230V
Single phase
A-Control
Outdoor Unit
In case of A-control wiring, there is high v oltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between po wer line
and communication signal line.Therefore, please turn off the main power supply when servicing. And do not touc h the S1, S2, S3 terminals when the power is
energized. If isolator should be used between indoor unit and outdoor unit, please use 3-pole type.
Isolator
S1
S2
S3
13
3 poles isolator
S1
S2
S3
A-Control
Indoor Unit
8-2. SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES
OCH512
The following connection patterns are available.
The outdoor unit power supply patterns vary on models.
1:1 System
* The optional indoor power supply terminal kit is required.
L1
L2
GR GR
S1
S2
S3
L1
L2
GR
S1
S2
S3
1
2
L1
L2
S1
S2
S3
1
1
2
2
GR
S1
S2
S3
L1
L2
* Affix a label B that is included with the manuals near each wiring diagram for the indoor and outdoor units.
Simultaneous twin system
L1
L2
GR
S1
S2
S3
Outdoor unit power supply
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cords
Remote controller
Indoor unit
Indoor unit power supply
Option
Outdoor unit power supply
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cords
Remote controller
Indoor unit
Indoor unit power supply
Option
Indoor unit earth
*Affix a label B that is included with the manuals near each wiring diagram for the indoor and outdoor units.
If the indoor and outdoor units have separate power supplies, refer to the table below.
Change the indoor unit electrical box wiring refering to the figure in the right and
the DIP switch settings of the outdoor unit control board.
Indoor unit specifications
Indoor unit electrical boxconnectorconnection change
Label affixed near each wiring diagram
for the indoor and outdoor units
Outdoor unit DIP switch settings (when
using separate indoor unit/outdoor unit
power supplies only)
Required
Required
ON
OFF 1 2
3
(SW8)
* There are three types of labels (labels A, B, and C).Affix the appropriate labels to
the units according to the wiring method.
Indoor unit model
Indoor unit power supply
Minimum circuit ampacity
Maximum rating of overcurrent protective device
Indoor unit power supply
size
Indoor unit power supply earth
%
Indoor unit-Outdoor unit
Wiring
Indoor unit earth
Wire No.
Remote controller-Indoor unit
Indoor unit L1-L2
Indoor unit-Outdoor unit S1-S2
Indoor unit-Outdoor unit S2-S3
rating
Circuit
Remote controller-Indoor unit
*1. Max. 120 m, 393 ft
*2. The 10 m, 30 ft wire is attached in the remote controller accessory. Max. 500 m, 1500 ft
*3. The figures are NOT always against the ground.
*1
*2
*3
*3
*3
*3
PLA-A42
PCA-A42
Single, 208/230 V, 60 Hz Single, 208/230 V, 60 Hz
2A
15A
2 % Min. AWG 16
1 % Min. AWG 16
2 % AWG 22 (polar) 3 % 1.5 (polar)
2 % AWG 22 (Non-polar) 2 % 0.3 (Non-polar)
–
AC 208/230 V AC 208/230 V
–
DC 24 V
DC 12 V
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Use copper supply wires.
3. Use wires rated 300V or more for the power supply cables.
4. Install an earth longer than other cables.
L1
L2
GR
S1
S2
S3
Indoor unit power supplied
from outdoor unit (Initial
setting)
Connectors (connections when
shipped from the factory are
for indoor unit power supplied
from outdoor unit)
BLUE
BLUE
YELLOW
YELLOW
CN101
Indoor unit
control board
PEAD-A42
3.50A
15A
1 % Min. 1.5
DC 24 V
DC 12 V
If the indoor and
outdoor units have
separate power
supplies, change the
connections of the
connectors as shown
in the following
figure.
YELLOW
BLUE
BLUE
YELLOW
L1
L2
GR
S1
S2
S3
Separate indoor unit/outdoor unit power
supplies
–
–
–
Connectors
CN101
Indoor unit
control board
14
8-3. INDOOR - OUTDOOR CONNECTING CABLE
OCH512
Outdoor power supply
Max. 45m, 147ft
Max. 50m, 164ft
Wire No. % Size
Max. 80m, 262ft
Indoor unit-Outdoor unit
+ The max. cable length may vary depending on the condition of installation, humidity or materials, etc.
Indoor/Outdoor separate
power supply
Indoor unit-Outdoor unit
+ The optional indoor power supply terminal kit is necessary.
Be sure to connect the indoor-outdoor connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufficient
insulation to ground or a poor electrical contact at the intermediate connection point.
3 % AWG16(polar)
3 % AWG13(polar)
Wire No. % Size
Max. 120m, 393ft
2 % Min. AWG22
3 % AWG13(polar) and S3 separated
15
8-4. M-NET WIRING METHOD
OCH512
(Points to note)
(1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from
making an influence on the signal communication. Place them at intervals of more than 5 cm. Do not put them in the same
conduit tube.
(2) Terminal block (TB7) for transmission wires should never be connected to 208/230V power supply. If it is connected,
electronic parts on M-NET P.C. board may burn out.
(3) Use 2-core × 1.25mm² [AWG16] shield wire (CVVS, CPEVS) for the transmission wire. Transmission signals may not be
sent or received normally if different types of transmission wires are put together in the same multi-conductor cable. Never
do this because this may cause a malfunction.
Group
remote
controller
Power
supply
unit for
transmission
wire
A-control
remote
controller
It would be ok if M-NET wire (non-polar, 2-cores) is arranged in addition to the wiring for A-control.
(4) Ground only one of any appliances through M-NET transmission wire (shield wire). Communication error may occur due to
the influence of electromagnetic noise.
“Ed” error will appear on the LED display of outdoor unit.
“0403” error will appear on the central-control remote controller.
Bad example (Multi spot grounding of shield wire)
Central
remote
controller
M-NET transmission wire
Power
supply
appliance
Refrigerant
address 00
M-NET
address 01
M-NET type
outdoor unit
A-control
remote
controller
M-NET type
outdoor unit
Refrigerant
address 00
M-NET
address 02
M-NET type
outdoor unit
A-control
remote
controller
Refrigerant
address 00
M-NET
address 03
Good example 1 (Single spot grounding of shield wire)
Central
remote
controller
M-NET transmission wire
Good example 2 (Single spot grounding of shield wire)
Central
remote
controller
M-NET transmission wire
If there are more than 2 grounding spots on the shield wire, noise may enter into the shield wire because the ground wire
and shield wire form one circuit and the electric potential difference occurs due to the impedance difference among ground-
ing spots. In case of single spot grounding, noise does not enter into the shield wire because the ground wire and shield
wire do not form one circuit.
To avoid communication errors caused by noise, make sure to observe the single spot grounding method described in the
installation manual.
Power
supply
appliance
Power
supply
appliance
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET type
outdoor unit
16
M-NET type
outdoor unit
M-NET type
outdoor unit
● M-NET wiring
OCH512
(1) Use 2-core × 1.25mm² [AWG16] shield wire for electric wires.
(Excluding the case connecting to system controller.)
(2) Connect the wire to the M-NET terminal block. Connect one core of the
transmission wire (non-polar) to A terminal and the other to B. Peel the
shield wire, twist the shield part to a string and connect it to S terminal.
(3) In the system which several outdoor units are being connected, the terminal
(A, B, S) on M-NET terminal block should be individually wired to the other
M-NET
terminal
block
ABS
Transmission
wire
Ground
wire
Shield
part
outdoor unit’s terminal, i.e. A to A, B to B and S to S. In this case, choose one of those outdoor units and drive a screw
to fix an ground wire on the plate as shown on the right figure.
8-4-1. M-NET address setting
In A-control models, M-NET address and refrigerant address should be set only for the outdoor unit. Similar to CITY MULTI
series, there is no need to set the address of outdoor unit and remote controller. To construct a central control system, the
setting of M-NET address should be conducted only upon the outdoor unit. The setting range should be 1 to 50 (the same as
that of the indoor unit in CITY MULTI system), and the address number should be consecutively set in a same group.
Address number can be set by using rotary switches
(SW11 for ones digit and SW12 for tens digit), which
is located on the M-NET board of outdoor unit.
(Initial setting: all addresses are set to “0”.)
8-4-2. Refrigerant address setting
<Setting example>
M-NET Address No.
SW11
Switching
setting
ones
digit
SW12
tens
digit
12
3
3
4
4
2
2
5
1
0
9
2
1
0
9
5
1
6
6
0
7
7
9
8
8
3
3
4
4
2
5
5
1
6
6
0
7
7
9
8
8
50
3
4
2
5
1
6
0
7
9
8
~
3
4
2
5
1
6
0
7
9
8
In case of multiple grouping system (multiple refrigerant circuits in one group), indoor units should be connected by remote
controller wiring (TB5) and the refrigerant address needs to be set. Leave the refrigerant addresses to “00” if the group setting is not conducted. Set the refrigerant address by using DIP SW1-3 to -6 on the outdoor controller board. [Initial setting: all
switches are OFF. (All refrigerant addresses are “00”.)]
Refrigerant
address
ON
OFF
1
ON
OFF
1
ON
OFF
1
3
4
5
2
6
0
ON
OFF
1
3
4
5
2
6
8
ON
OFF
1
3
4
5
2
6
1
ON
OFF
1
3
4
5
2
6
9
ON
OFF
1
3
4
5
2
6
2
ON
OFF
1
3
4
5
2
6
10
ON
OFF
1
3
4
5
2
6
3
ON
OFF
1
3
4
5
2
6
11
ON
OFF
1
3
4
5
2
6
4
ON
OFF
1
3
4
5
2
6
12
ON
OFF
1
3
4
5
2
6
5
ON
OFF
1
3
4
5
2
6
13
ON
OFF
1
3
4
2
6
3
4
2
14
3
5
5
4
5
2
6
ON
OFF
6
6
7
1
3
4
5
2
6
15
8-4-3. Regulations in address settings
In case of multiple grouping system, M-NET and refrigerant address settings should be done as explained in the above section. Set the lowest number in the group for the outdoor unit whose refrigerant address is “00” as its M-NET address.
Group A Group B Group C
System
controller
Power
supply
unit for
transmission
wire
Refrigerant
address 00
M-NET
address 01
A-control
remote
controller
Refrigerant
address 00
M-NET
address 02
A-control
remote
controller
Refrigerant
address 01
M-NET
address 03
TB5
Refrigerant
address 00
M-NET
address 04
A-control
remote
controller
w Refrigerant addresses can be overlapped if they are in the different group.
System
controller
Power
supply
unit for
transmission
wire
w In group B, M-NET address of the outdoor unit whose refrigerant address is “00” is not set to the minimum in the group. As
“03” is right for this situation, the setting is wrong. Taking group A as a good sample, set the minimum M-NET address in
the group for the outdoor unit whose refrigerant address is “00”.
Group A Group B
Refrigerant
address 00
M-NET
address 01
Refrigerant
address 01
M-NET
address 02
Refrigerant
address 00
M-NET
address 04
TB5
A-control
remote
controller
A-control
remote
controller
17
Refrigerant
address 01
M-NET
address 03
Refrigerant
address 02
M-NET
address 05
9
OCH512
REFRIGERANT SYSTEM DIAGRAM
PUZ-A42NHA5 Unit: mm (inch)
PUZ-A42NHA5-BS
Refrigerant GAS pipe
15.88 (W5/8)
Ball valve
Service port
(check)
4-way
valve
(#50)
Strainer
Service port
(check)
High pressure protect switch
Outdoor heat exchanger
Muffler
Thermistor
(TH6)
Thermistor
(TH3)
Refrigerant LIQUID pipe
9.52 (W3/8)
Strainer
(#100)
Accumulator
Compressor
Strainer
(#100)
Stop valve
(with service port)
Thermistor
(TH32)
Strainer
(#100)
Linear expansion valve
Refrigerant flow in cooling
Refrigerant flow in heating
Distributor
PUY-A42NHA5 Unit: mm (inch)
PUY-A42NHA5-BS
Refrigerant GAS pipe
15.88 (W5/8)
Ball valve
Strainer
Service port
(check)
(#50)
Strainer
(#100)
Service port
(check)
High pressure
protect switch
Outdoor heat exchanger
Thermistor
(TH6)
Thermistor
(TH3)
Accumulator
Refrigerant LIQUID pipe
9.52 (W3/8)
Stop valve
(with service port)
Compressor
Strainer
(#100)
Thermistor
(TH32)
Strainer
(#100)
Linear expansion valve
18
Distributor
Refrigerant flow in cooling
1. Refrigerant collecting (pump down)
OCH512
Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit.
1 Supply power (circuit breaker).
* When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CENTRALLY
CONTROLLED” is displayed, the refrigerant collecting (pump down) cannot be completed normally.
* Start-up of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down
operation 3 to 4 minutes after the power (circuit breaker) is turned ON.
2 After the liquid stop valve is closed, set SW1-1 on the control board of the outdoor unit to ON. The compressor (outdoor unit) and ventilators
(indoor and outdoor units) start operating and refrigerant collecting operation begins. LED1 and LED2 on the control board of the outdoor
unit are lit.
* Only set SW1-1 to ON if the unit is stopped. However, even if the unit is stopped and SW1-1 is set to ON less than three minutes after
the compressor stops, the refrigerant collecting operation cannot be performed. Wait until compressor has been stopped for three minutes
and then set SW1-1 to ON again.
3 Because the unit automatically stops in about two to three minutes when the refrigerant collecting operation is completed (LED1 off, LED2
lit), be sure to quickly close the gas stop valve. If LED1 is lit and LED2 is off and the outdoor unit is stopped, refrigerant collection is not
properly performed. Open the liquid stop valve completely, and then repeat step 2 after three minutes have passed.
* If the refrigerant collecting operation has been completed normally (LED1 off, LED2 lit), the unit will remain stopped until the power supply
is turned off.
4 Turn off the power supply (circuit breaker).
* Note that when the extension piping is very long with large refrigerant amount, it may not be possible to perform a pump-down operation.
Warning:
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if
air etc. get into it.
2. Refrigerant pipe airtight testing method
(1) Connect the testing tools.
• Make sure the stop valves A B are closed and do not open them.
• Add pressure to the refrigerant lines through the service port C of the liquid stop valve D.
(2) Do not add pressure to the specified pressure all at once; add pressure little by little.
1 Pressurize to 0.5 MPa (5 kgf/cm²G), wait 5 minutes, and make sure the pressure does not decrease.
2 Pressurize to 1.5 MPa (15 kgf/cm
3 Pressurize to 4.15 MPa (41.5 kgf/cm²G) and measure the surrounding temperature and refrigerant pressure.
(3) If the specified pressure holds for about one day and does not decrease, the pipes have passed the test and there are no leaks.
• If the surrounding temperature changes by 1°C, the pressure will change by about 0.03 MPa (0.3 kgf/cm²G). Make the necessary corrections.
(4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source of the gas leak.
²
G), wait 5 minutes, and make sure the pressure does not decrease.
Stop valve <Liquid side>
Stop valve <Gas side>
Service port
Open/Close section
Local pipe
Sealed, same way for gas side
Pipe cover
Do not use a wrench here.
Refrigerant leakage may result.
Use 2 wrenches here.
3. Start and finish of test run
• Operation from the indoor unit
Execute the test run using the installation manual for the indoor unit.
• Operation from the outdoor unit
By using the DIP switch SW4 on the control board of outdoor unit, test run can be started and finished, and its operation
mode (cooling/heating) can be set up.
1 Set the operation mode (cooling/heating) using SW4-2.
2 Turn on SW4-1 to start test run with the operation mode set by SW4-2.
3 Turn off SW4-1 to finish the test run.
• There may be a faint knocking sound around the machine room after power is supplied, but this is
not a problem with the product because the linear expansion valve is just moving to adjust opening pulse.
• There may be a knocking sound around the machine room for several seconds after compressor
starts operating. But this is not a problem with product because the check valve itself generates
the sound because pressure difference is small in the refrigerant circuit.
Note:
The operation mode cannot be changed by SW4-2 during test run. (To change test run mode, stop the unit by SW4-1,
change the operation mode and restart the test run by SW4-1.)
<SW4>
ON
OFF
12
Stop Operation
Cooling Heating
(PUZ only)
19
10 TROUBLESHOOTING
OCH512
10-1. TROUBLESHOOTING
<Error code display by self-diagnosis and actions to be taken for service (summary)>
Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit.
Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the
table below. Check the contents below before investigating details.
Unit conditions at service
The trouble is reoccurring.
The trouble is not reoccurring.
Error code
Displayed
Not displayed
Logged
Not logged
Actions to be taken for service (summary)
Judge what is wrong and take a corrective action according
to “10-4. Self-diagnosis action table”.
Conduct trouble shooting and ascertain the cause of the
trouble according to “10-5. Troubleshooting of problems”.
Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring and etc.
Reset error code logs and restart the unit after finishing
service.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.
Re-check the abnormal symptom.
Conduct trouble shooting and ascertain the cause of the
trouble according to “10-5. Troubleshooting of problems”.
Continue to operate unit for the time being if the cause
is not ascertained.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.
10-2. CHECK POINT UNDER TEST RUN
(1) Before test run
• After installation of indoor and outdoor units, piping work and electric wiring work, re-check that there is no refrigerant leak-
age, loosened connections and incorrect polarity.
• Measure impedance between the ground and the power supply terminal block (L1, L2) on the outdoor unit by 500V Megger
and check that it is 1.0M" or over.
w Do not use 500V Megger to indoor/outdoor connecting wire terminal block (S1, S2, S3) and remote controller terminal
block (1, 2). This may cause malfunction.
• Make sure that test run switch (SW4) is set to OFF before turning on power supply.
• Turn on power supply 12 hours before test run in order to protect compressor.
• For specific models which requires higher ceiling settings or auto-recovery feature from power failure, make proper changes
of settings referring to the description of “12. FUNCTION SETTING”.
Make sure to read operation manual before test run. (Especially items to secure safety.)
20
"TEST RUN" and the currently selected
OCH512
operation mode are displayed alternately.
Displays the remaining
test run time.
F
[TEST] button
Operating procedures
1. Turn on the main power supply.
2. Press TEST button twice.
3. Press OPERATION SWITCH
button.
4. Press AIR DIRECTION button.
5. Check the outdoor unit fan for
correct running.
While the room temperature display on the remote
controller is “PLEASE WAIT”, the remote controller is disabled.
Wait until “PLEASE WAIT” disappears before using remote controller.
“PLEASE WAIT” appears for about 2 minutes after power
supply is turned on. +1
The TEST RUN appears on the screen.
Cooling mode:
Heating mode: Check if warm air blows. (It takes a little
while until warm air blows.)
Check for correct motion of auto-vanes.
The outdoor unit features automatic capacity control to
provide optimum fan speeds. Therefore, the fan keeps
running at a low speed to meet the current outside air
condition unless it exceeds its available maximum power.
Then, in actuality, the fan may stop or run in the reverse
direction depending on the outside air, but this does not
mean malfunction.
Check if cool air blows and water is drained.
6. Press the ON/OFF button to reset the test run in progress.
Pipe (liquid) temperature
7. Register the contact number.
• In case of test run, the OFF timer will be activated, and the test run will automatically stop after 2 hours.
• The room temperature display section shows the pipe temperature of indoor units during the test run.
• Check that all the indoor units are running properly in case of simultaneous twin operation. Malfunctions may not be displayed regardless of incorrect wiring.
w1 After turning on the power supply, the system will go into startup mode, “PLEASE WAIT” will blink on the display section
of the room temperature, and lamp (green) of the remote controller will blink.
As to INDOOR BOARD LED, LED1 will be lit, LED2 will either be lit in case the address is 0 or turned off in case the
address is not 0. LED3 will blink.
As to OUTDOOR BOARD LED, LED1 (green) and LED2 (red) will be lit. (After the startup mode of the system finishes,
LED2 (red) will be turned off.)
In case OUTDOOR BOARD LED is digital display, — and — will be displayed alternately every second.
• If one of the above operations does not function correctly, the causes written below should be considered. Find causes from
the symptoms.
The below symptoms are under test run mode. “startup” in the table means the display status of w1 written above.
Symptoms in test run mode
Remote Controller Display
Remote controller displays “PLEASE
WAIT”, and
cannot be operated.
After power is turned on, “PLEASE WAIT”
is displayed for 3 minutes, then error code
is displayed.
OUTDOOR BOARD LED Display
< > indicates digital display.
After “startup” is displayed, only
green lights up. <00>
After “startup” is displayed,
green (once) and red (once)
blink alternately. <F1>
After “startup” is displayed,
green (once) and red (twice)
• After power is turned on, “PLEASE WAIT” is displayed for 2
minutes during
system startup. (Normal)
• Incorrect connection of outdoor terminal block (L1, L2, and
S1, S2, S3.)
• Outdoor unit’s protection device connector is open.
Cause
blink alternately. <F5>
No display appears even when remote
controller operation switch is turned on.
(Operation lamp does not light up.)
Display appears but soon disappears
even when remote controller is operated.
After “startup” is displayed,
green (twice) and red (once)
blink alternately. <EA, Eb, EC>
After “startup” is displayed, only
green lights up. <00>
After “startup” is displayed, only
green lights up. <00>
• Incorrect wiring between the indoor and outdoor unit (Polarity
is wrong for S1, S2, S3.)
• Remote controller transmission wire is short.
• There is no outdoor unit of address 0.
(Address is other than 0.)
• Remote controller transmission wire is open.
• After canceling function selection, operation is not possible for
about 30 seconds. (Normal)
w Press the remote controller’s CHECK button twice to perform self-diagnosis. See the table below for the contents of LCD
display.
LCD
P1
Abnormality of room temperature thermistor
P2
Abnormality of pipe temperature thermistor/Liquid
Abnormality of drain sensor/Float switch connector open
P4
Drain overflow protection is working.
P5
Freezing/overheating protection is working.
P6
Abnormality of pipe temperature
P8
Abnormality of pipe temperature thermistor/Cond./Eva
P9
Abnormality of indoor controller board
Fb
Contents of inferior phenomena
LCD
U1~UP
Malfunction outdoor unit
F3~F9
Malfunction outdoor unit
E0~E5
Remote controller transmitting error
Indoor/outdoor unit communication error
E6~EF
----
No error history
No applied unit
FFFF
Forced compressor stop(due to water leakage abnormality)
PA
Contents of inferior phenomena
See the table below for details of the LED display (LED 1, 2, 3) on the indoor controller board.
LED1 (microprocessor power supply)
LED2 (remote controller)
LED3 (indoor/outdoor communication)
Lights when power is supplied.
Lights when power is supplied for wired remote controller.
The indoor unit should be connected to the outdoor unit with address “0” setting.
Flashes when indoor and outdoor unit are communicating.
21
OCH512
,
COOL
ON/OFF
MODE
CHECK
TEST RUN
SET
TEST
RUN
FAN
VANE
LOUVER
RESET
CLOCK
TEMP
AUTO STOP
AUTO START
h
min
Test run [for IR wireless remote controller]
Measure an impedance between the power supply terminal block on
the outdoor unit and ground with a 500V Megger and check that it is
equal to or greater than 1.0M".
1 Turn on the main power to the unit.
2 Press the button twice continuously.
(Start this operation from the turned off status of remote controller
display.)
TEST RUN
and current operation mode are displayed.
3 Press the ( ) button to activate mode, then
check whether cool air is blown out from the unit.
4 Press the ( ) button to activate mode, then
check whether warm air is blown out from the unit.
5 Press the button and check whether strong air is blown out
from the unit.
6 Press the button and check whether the auto vane operates
properly.
7 Press the ON/OFF button to stop the test run.
Note:
• Point the remote controller towards the indoor unit receiver
while following steps 2 to 7.
• It is not possible to run in FAN, DRY or AUTO mode.
TEST RUN
MODE
MODE
FAN
VANE
COOL
HEAT
22
10-3. HOW TO PROCEED "SELF-DIAGNOSIS"
OCH512
10-3-1. When a Problem Occurs During Operation
If a problem occurs in the air conditioner, the indoor and outdoor units will stop,
and the problem is shown in the remote controller display.
[CHECK] and the refrigerant address are displayed on the temperature
display, and the error code and unit number are displayed alternately as
shown below.
(If the outdoor unit is malfunctioning, the unit number will be "00".)
In the case of group control, for which remote controller controls
multiple refrigerant systems, the refrigerant address and error code of the
unit that first experienced trouble (i.e., the unit that transmitted the error
code) will be displayed.
To clear the error code, press the
ON/OFF
button.
Error code (2 or 4 digits)
(Alternating Display)
Address (3 digits) or unit number (2 digits)
When using remote-/local-controller combined operation, cancel the error code after turning off remote operation. During
central control by a MELANS controller, cancel the error code by pressing the
ON/OFF
button.
10-3-2. Self-Diagnosis During Maintenance or Service
Since each unit has a function that stores error codes, the latest check code can be recalled even if it is cancelled by the remote
controller or power is shut off.
Check the error code history for each unit using the remote controller.
Switch to self-diagnosis mode.
Press the
The display content will change as shown below.
CHECK
button twice within 3 seconds.
Unit number or refrigerant address
to be diagnosed
Set the unit number or refrigerant address you want to diagnose.
Press the [TEMP] buttons ( and ) to select the desired
number or address. The number (address) changes between [01] and [50]
or [00] and [15].
The refrigerant address will begin to blink
approximately 3 seconds after being
selected and the self-diagnosis process will begin.
Display self-diagnosis results.
<When there is error code history>
(For the definition of each error code, refer to the indoor unit's installation manual or service handbook.)
Error code (2 or 4 digits)
<When there is no error code history> <When there is no corresponding unit>
Reset the error history.
Display the error history in the diagnosis result display screen (see step
(Alternating Display)
Address (3 digits) or unit number (2 digits)
).
23
Press the
OCH512
Press the
ON/OFF
CHECK
ON/OFF
The self-diagnosis address or refrigerant address will blink.
Cancel self-diagnosis.
Self-diagnosis can be cancelled by the following 2 methods.
Press the
button twice within 3 seconds.
button twice within 3 seconds. Self-diagnosis will be cancelled and the screen will return to the previous state in effect before the start
button. Self-diagnosis will be cancelled and the indoor unit will stop.
of self-diagnosis.
When the error history is reset, the display will look like the one shown below.
However, if you fail to reset the error history , the error content will be displayed again.
10-3-3. Remote Controller Diagnosis
If the air conditioner cannot be operated from the remote controller, diagnose the remote controller as explained below.
First, check that the power-on indicator is lit.
If the correct voltage (DC12 V) is not supplied to the remote controller, the
indicator will not light.
If this occurs, check the remote controller's wiring and the indoor unit.
Power on indicator
Switch to the remote controller self-diagnosis mode.
Press the
CHECK
The display content will change as shown below.
button for 5 seconds or more.
Press the
FILTER
button to start self-diagnosis.
Remote controller self-diagnosis result
[When the remote controller is functioning correctly]
Check for other possible causes, as there is no problem with the remote
controller.
[Where the remote controller is not defective, but cannot be operated.]
(Error display 2) [E3], [6833] or [6832] blinks. © Transmission is not possible.
There might be noise or interference on the transmission path, or the indoor unit
or other remote controllers are defective. Check the transmission path and other
controllers.
[When the remote controller malfunctions]
(Error display 1) "NG" blinks. © The remote controller's transmitting-receiv-
The remote controller must be replaced with a new one.
(Error display 3)
The number of data errors is the difference between the number of bits sent from
the remote controller and the number actually transmitted through the transmission path. If such a problem is occurring, the transmitted data is affected by noise,
etc. Check the transmission path.
ing circuit is defective.
"ERC" and the number of data errors are displayed.
© Data error has occurred.
When the number of data errors is "02":
Transmission data from remote controller
Transmission data on transmission path
To cancel remote controller diagnosis
Press the
After approximately 30 seconds, the state in effect before the diagnosis will be restored.
CHECK
button for 5 seconds or more. Remote controller diagnosis will be cancelled, "PLEASE WAIT" and operation lamp will blink.
24
10-3-4. Malfunction-diagnosis method by IR wireless remote controller
OCH512
<In case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.
<Malfunction-diagnosis method at maintenance service>
[Procedure]
CHECK
display
ON/OFF
button
CHECK
button
ON/OFF
MODE
CHECK
TEST RUN
SET
CHECK
FAN
VANE
LOUVER
RESET
TEMP
AUTO STOP
AUTO START
CLOCK
h
min
Refrigerant
address
display
Temperature
button
HOUR
button
1. Press the CHECK button twice.
2. Press the temperature
buttons.
3. Point the remote controller at
the sensor on the indoor unit
and press the HOUR button.
• "CHECK" lights, and refrigerant address
"00" blinks.
• Check that the remote controller's
display has stopped before continuing.
• Select the refrigerant address of the
indoor unit for the self-diagnosis.
Note: Set refrigerant address using the
outdoor unit’s DIP switch (SW1).
(For more information, see the
outdoor unit installation manual.)
• If an air conditioner error occurs, the
indoor unit's sensor emits an intermittent
buzzer sound, the operation lamp blinks,
and the error code is output.
(It takes 3 seconds at most for error
code to appear.)
4. Point the remote controller at
the sensor on the indoor unit
and press the ON/OFF button.
• The check mode is cancelled.
25
• Refer to the following tables for details on the check codes.
OCH512
[Output pattern A]
Beeper sounds
OPERATION
INDICATOR
lamp blink
pattern
Beep
Self-check
starts
(Start signal
received)
Beep Beep Beep Beep Beep Beep
1st2nd3
Off
Approx. 2.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
rd
0.5 sec.
th
n
On
Approx. 2.5 sec.On0.5 sec.On0.5 sec.
[Output pattern B]
Beeper sounds
OPERATION
INDICATOR
lamp blink
pattern
Beep Beep Beep Beep Beep Beep Beep
1st2nd3
Off
Self-check
starts
(Start signal
received)
Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
[Output pattern A] Errors detected by indoor unit
IR wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks Check code
(Number of times)
1P1
2
P2
P9
3E6,E7
4P4
5
P5
PA
6P6
7EE
8P8
9E4, E5
10
11
–
–
12 Fb
–
E0, E3
–E1, E2
Intake sensor error
Pipe (TH2) sensor error
Pipe (TH5) sensor error
Indoor/outdoor unit communication error
Drain sensor error/Float switch connector open
Drain pump error
Forced compressor stop (due to water leakage abnormality)
Freezing/Overheating protection operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
Remote controller transmission error
Remote controller control board error
nd
1st2
Off
Number of blinks/beeps in pattern indicates
the check code in the following table
rd
th
n
· · · Repeated
nd
1st2
Off
Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.
Number of blinks/beeps in pattern indicates
the check code in the following table
· · · Repeated
Symptom Remark
As for indoor
unit, refer to
indoor unit's
service manual.
[Output pattern B]
IR wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks Check code
Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wired remote controller
Symptom Remark
(Number of times)
1
2
3
4
5 Abnormal high discharging temperature/insufficient refrigerant
6
7
8
9
11
12
13
14
E9
UP
U3,U4
UF
U2
U1,Ud
U5
U8
U6
U9,UH
–
–
Others
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high pressure (63H operated)/Overheating
protection operation
Abnormal temperature of heatsink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
–
–
Other errors
For details, check
the LED display
of the outdoor
controller board.
*1If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on, there are no error records.
*2If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
26
10-4. SELF-DIAGNOSIS ACTION TABLE
OCH512
<Abnormalities detected when the power is turned on>
Error Code
Abnormal point and detection method
1 No voltage is supplied to termi-
nal block (TB1) of outdoor unit.
a) Power supply breaker is
b) Contact failure or disconnecc) Open phase (L1 or L2
(Note 1) Refer to indoor unit section for code P and code E.
Case
1 Check following items.
a) Power supply breaker
b) Connection of power supply terminal block
turned off.
c) Connection of power supply terminal block
tion of power supply terminal
phase)
Judgment and action
(TB1)
(TB1)
None
2 Electric power is not charged to
power supply terminal of outdoor power circuit board.
a) Contact failure of power sup-
ply terminal
b) Open phase on the outdoor
power circuit board
Disconnection of connector
TABT or TABS
3 Electric power is not supplied
to outdoor controller circuit
board.
—
a) Disconnection of connector
(CNDC)
4 Disconnection of reactor (DCL)
5 Disconnection of outdoor noise
filter circuit board or parts failure in outdoor noise filter circuit
board
It is especially needed to check
the resistance RS1 on the
noise filter circuit board.
6 Defective outdoor power circuit
board
2 Check following items.
a) Connection of power supply terminal block
(TB1)
b) Connection of terminal on outdoor power
circuit board
Disconnection of connector TABT or TABS
Refer to 10-9.
3 Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Refer to 10-9.
4 Check connection of “L1” and “L2” on the
active filter module. (ACTM) Refer to 10-9.
5 a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to 10-9.
6 Replace outdoor power circuit board.
F5
(5201)
63H connector open
Abnormal if 63H connector circuit is open for
3 minutes continuously after power supply.
63H: High-pressure switch
7 Defective outdoor controller cir-
cuit board
1 Disconnection or contact failure
of 63H connector on outdoor
controller circuit board
2 Disconnection or contact failure
of 63H
3 63H is operating due to
defective parts.
4 Defective outdoor controller
circuit board
7 Replace controller board (When items
above are checked but the units cannot be
repaired).
1 Check connection of 63H connector on
outdoor controller circuit board.
Refer to 10-9.
2 Check the 63H side of connecting wire.
3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller circuit board.
27
Error Code
OCH512
EA
(6844)
Abnormal point and detection method
Indoor/outdoor unit connector
miswiring, excessive number of units
1. Outdoor controller circuit board can
automatically check the number of
connected indoor units. Abnormal if the
number cannot be checked automatically
due to miswiring of indoor/outdoor unit
connecting wire and etc. after power is
turned on for 4 minutes.
2. Abnormal if outdoor controller circuit
board recognizes excessive number of
indoor units.
Case
1 Contact failure or miswiring of
indoor/outdoor unit connecting
wire
2 Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
3 4 or more indoor units are
connected to 1 outdoor unit.
4 Defective transmitting receiving
circuit of outdoor controller
circuit board
5 Defective transmitting receiving
circuit of indoor controller board
6 Defective indoor power board
7 2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
8 Noise has entered into power
supply or indoor / outdoor unit
connecting wire.
Judgment and action
1 Check disconnection or looseness or polarity
of indoor/outdoor unit connecting wire of
indoor and outdoor units.
2 Check diameter and length of indoor/outdoor
unit connecting wire.
Total wiring length: 80m [262ft]
(including wiring connecting each indoor unit
and between indoor and outdoor unit)
Also check if the connection order of flat
cable is S1, S2, S3.
3 Check the number of indoor units that are
connected to one outdoor unit. (If EA is
detected)
4~6 Turn the power off once, and on again to
check.
Replace outdoor controller circuit board,
indoor controller board or indoor power
board if abnormality occurs again.
7 Check if refrigerant addresses (SW1-3 to
SW1-6 on outdoor controller circuit board) are
overlapping in case of group control system.
8 Check transmission path, and remove the
cause.
Eb
(6845)
EC
(6846)
Miswiring of indoor/outdoor unit
connecting wire (converse wiring or
disconnection)
Outdoor controller circuit board can
automatically set the unit number of indoor
units.
Abnormal if the indoor unit number cannot
be set within 4 minutes after power on
because of miswiring (converse wiring
or disconnection) of indoor/outdoor unit
connecting wire.
Start-up time over
The unit cannot finish start-up process
within 4 minutes after power on.
1 Contact failure or miswiring of
indoor/outdoor unit connecting
wire
2 Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
4 Defective transmitting receiving
circuit of outdoor controller
circuit board
5 Defective transmitting receiving
circuit of indoor controller board
6 Defective indoor power board
7 2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
8 Noise has entered into power
supply or indoor/outdoor unit
connecting wire.
1 Contact failure of indoor/
outdoor unit connecting wire
2 Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
7 2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
w The descriptions above, 1-8, are for EA, Eb
and EC.
8 Noise has entered into power
supply or indoor/outdoor unit
connecting wire.
28
<Abnormalities detected while unit is operating>
OCH512
Error Code
U1
(1302)
Abnormal point and detection method
High pressure (High-pressure switch
63H operated)
Abnormal if high-pressure switch 63H operated ( w ) during compressor operation.
w 4.15 MPa [602PSIG]
63H: High-pressure switch
Case
1 Short cycle of indoor unit
2 Clogged filter of indoor unit
3 Decreased airflow caused by
dirt of indoor fan
4 Dirt of indoor heat exchanger
5 Locked indoor fan motor
6 Malfunction of indoor fan motor
7 Defective operation of stop
valve (Not full open)
8 Clogged or broken pipe
9 Locked outdoor fan motor
0 Malfunction of outdoor fan
motor
1 Short cycle of outdoor unit
2 Dirt of outdoor heat exchanger
3 Decreased airflow caused by
defective inspection of outside
temperature thermistor
(It detects lower temperature
than actual temperature.)
4 Disconnection or contact failure
of connector (63H) on outdoor
controller board
5 Disconnection or contact failure
of 63H connection
6 Defective outdoor controller
board
7 Defective action of linear
expansion valve
8 Malfunction of fan driving circuit
Judgment and action
1~6 Check indoor unit and repair the defect.
7 Check if stop valve is fully open.
8 Check piping and repair the defect.
9~2 Check outdoor unit and repair the defect.
3 Check the inspected temperature of outside
temperature thermistor on LED display.
(SW2 on A-Control Service Tool : Refer to
10-10.)
4~6 Turn the power off and check F5 is
displayed when the power is on again.
When F5 is displayed, refer to “Judgment
and action” for F5.
7 Check linear expansion valve.
Refer to 10-6, 7.
8 Replace outdoor controller board.
U2
(TH32: 1132)
U3
(TH32: 5132)
High comp.shell temperature
Abnormal if comp.shell temperature
thermistor (TH32) exceeds 125: [257˚F].
Open/short circuit of comp.shell
thermistor (TH32)
Abnormal if open (3: [37˚F] or less) or
short (217: [422˚F] or more) is detected
during compressor operation.
(Detection is inoperative for 10 minutes
of compressor starting process and for 10
minutes after and during defrosting.)
1 Overheated compressor opera-
tion caused by shortage of
refrigerant
2 Defective operation of stop
valve
3 Defective thermistor
4 Defective outdoor controller
board
5 Defective action of linear
expansion valve
1 Disconnection or contact failure
of connector (TH32) on the
outdoor controller circuit board
2 Defective thermistor
3 Defective outdoor controller
circuit board
1 Check intake superheat.
Check leakage of refrigerant.
Charge additional refrigerant.
2 Check if stop valve is fully open.
34 Turn the power off and check if U3 is dis-
played when the power is on again.
When U3 is displayed, refer to “Judgement
and action” for U3.
5 Check linear expansion valve.
Refer to 10-6, 7.
1 Check connection of connector (TH32) on the
outdoor controller circuit board.
Check breaking of the lead wire for thermistor
(TH32). Refer to 10-9.
2 Check resistance value of thermistor (TH32)
or temperature by microprocessor.
(Thermistor/TH32: Refer to 10-6.)
(SW2 on A-Control Service Tool: Refer to
10-10.)
3 Replace outdoor controller board.
29
Error Code
OCH512
U4
(TH3:5105)
(TH6:5107)
(TH7:5106)
(TH8:5110)
Abnormal point and detection method
Open/short of outdoor unit thermistors
(TH3, TH6, TH7, and TH8)
Abnormal if open or short is detected
during compressor operation.
Open detection of thermistors TH3 and
TH6 is inoperative for 10 seconds to 10
minutes after compressor starting and 10
minutes after and during defrosting.
WCheck which unit has abnormality in its
thermistor by switching the mode of
SW2. (PAC-SK52ST)
(Refer to 10-10.)
Case
1 Disconnection or contact failure
of connectors
Outdoor controller circuit
board: TH3,TH6/TH7
Outdoor power circuit board:
(
CN3
2 Defective thermistor
3 Defective outdoor controller
circuit board
)
Judgment and action
1 Check connection of connector (TH3,TH6/TH7)
on the outdoor controller circuit board.
Check connection of connector (CN3) on the
outdoor power circuit board.
Check breaking of the lead wire for thermistor
(TH3,TH6,TH7,TH8). Refer to 10-9.
2 Check resistance value of thermistor
(TH3,TH6,TH7,TH8) or check temperature by
microprocessor.
(Thermistor / TH3, TH6, TH7, TH8 : Refer to
10-6.)
(SW2 on A-Control Service Tool: Refer to
10-10.)
3 Replace outdoor controller circuit board.
WEmergency operation is available in case of
abnormalities of TH3, TH6 and TH7.
Refer to 10-8.
U5
(4230)
Symbol Name
TH3
TH6
TH7
TH8
Temperature of heatsink
Abnormal if heatsink thermistor (TH8)
detects temperature indicated below.
A42N··························84:, 183˚F
Thermistors
Thermistor <Outdoor pipe>
Thermistor <Outdoor 2-phase pipe>
Thermistor <Outdoor>
Thermistor <Heatsink>
– 40[-40°F] or below
– 40[-40°F] or below
– 40[-40°F] or below
– 27[-17°F] or below
1 The outdoor fan motor is
locked.
2 Failure of outdoor fan motor
3 Air flow path is clogged.
4 Rise of ambient temperature
5 Defective thermistor
6 Defective input circuit of
outdoor power circuit board
7 Failure of outdoor fan drive
circuit
Open detection Short detection
90[194°F] or above
90[194°F] or above
90[194°F] or above
102[216°F] or above
12 Check outdoor fan.
3 Check airflow path for cooling.
4 Check if there is something which causes
temperature rise around outdoor unit.
(Upper limit of ambient temperature is 46:
[114˚F].)
Turn off power, and on again to check if U5
is displayed within 30 minutes.
If U4 is displayed instead of U5, follow the
action to be taken for U4.
5 Check resistance value of thermistor (TH8)
or temperature by microprocessor.
(Thermistor/TH8: Refer to 10-6.)
(SW2 on A-Control Service Tool: Refer to
10-10.)
6 Replace outdoor power circuit board.
7 Replace outdoor controller circuit board.
Power module
Check abnormality by driving power module
in case overcurrent is detected.
(UF or UP error condition)
U6
(4250)
1 Outdoor stop valve is closed.
2 Decrease of power supply voltage
3 Looseness, disconnection or
converse of compressor wiring
connection
4 Defective compressor
5 Defective outdoor power circuit
board
30
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor. Refer to 10-9 (Outdoor power
circuit board).
4 Check compressor referring to 10-6.
5 Replace outdoor power circuit board.
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