Mitsubishi Electric Mr.Slim PUHZ-P125VKA User manual

SERVICE MANUAL
No.OCH670
SPLIT-TYPE AIR CONDITIONERS
R410A
September 2017
Outdoor unit
[Model Name]
PUHZ-P100VKA
PUHZ-P125VKA
PUHZ-P140VKA
PUHZ-P100YKA
PUHZ-P125YKA
PUHZ-P140YKA
[Service Ref.]
PUHZ-P100VKA.TH
PUHZ-P100VKA.TH-ET
PUHZ-P100VKA.TH-ER
PUHZ-P125VKA.TH
PUHZ-P125VKA.TH-ET
PUHZ-P125VKA.TH-ER
PUHZ-P140VKA.TH
PUHZ-P140VKA.TH-ET
PUHZ-P140VKA.TH-ER
PUHZ-P100YKA.TH
PUHZ-P100YKA.TH-ET
PUHZ-P100YKA.TH-ER
PUHZ-P125YKA.TH
PUHZ-P125YKA.TH-ET
PUHZ-P125YKA.TH-ER
PUHZ-P140YKA.TH
PUHZ-P125YKA.TH-ET
PUHZ-P125YKA.TH-ER
PARTS CATALOG (OCB670)
CONTENTS
1. REFERENCE MANUAL ································· 2
2. SAFETY PRECAUTION ································· 2
3. SPECIFICATIONS ·········································· 6
4. DATA······························································· 7
5. OUTLINES AND DIMENSIONS ··················· 10
6. WIRING DIAGRAM ······································ 11
7. WIRING SPECIFICATIONS·························· 14
8. REFRIGERANT SYSTEM DIAGRAM ············· 19
9. TROUBLESHOOTING ································· 21
10. FUNCTION SETTING ··································· 78
11. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ····90
12. EASY MAINTENANCE FUNCTION ··········· 100
13. DISASSEMBLY PROCEDURE··················· 104

2
OCH670
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
INDOOR UNIT SERVICE MANUAL
Model name Service Ref. Service
Manual No.
PLA-RP50/60/71/100/125/140EA PLA-RP50/60/71/100/125/140EA.UK OCH626
OCB626
PCA-M50/60/71/100/125/140KA PCA-M50/60/71/100/125/140KA OCH659
OCB659
PCA-RP50/60/71/100/125/140KAQ PCA-RP50/60/71/100/125/140KAQR2(-ER) OCH491
OCB491
PEAD-M50/60/71/100/125/140JA(L) PEAD-M50/60/71/100/125/140JA(L).UK HWE16130
BWE017010
PEAD-RP100/125/140JA(L)Q PEAD-RP50JA(L)QR2.UK
PEAD-RP60/71/100/125/140JA(L)QR3.UK
HWE1009A
BWE014160
PSA-RP71/100/125/140KA PSA-RP71/100/125/140KA OCH528
OCB528
PKA-M50HA(L) PKA-M50HA(L) OCH660
OCB660
PKA-M60/71/100KA(L) PKA-M60/71/100KA(L).TH OCH661
OCB661
PKA-RP50HAL PKA-RP50HALR1(-ER) OCH453
OCB453
PKA-RP60/71/100KAL PKA-RP60/71/100KALR1.TH(-ER) OCH452
OCB452
2SAFETY PRECAUTION
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
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 breaker.
• 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.
1REFERENCE MANUAL

3
OCH670
[1] Cautions for service
(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) If moisture or foreign matter might have entered the refrigerant piping during the service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Electronic weighing scale
Unit
Make sure that the inside and outside of refrige-
rant 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 deterio-
ration of refrigerant oil, etc.
Store the piping indoors, 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 com-
pressor.
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 deterio-
ration of refrigerant oil, etc.
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.
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.
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the following.
•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.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
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.
Use the specified refrigerant only.

4
OCH670
2-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES
(1) Flowchart
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1Gauge manifold • Only for R410A
• Use the existing fitting specifications. (UNF1/2)
• Use high-tension side pressure of 5.3MPa·G or over.
2Charge hose • Only for R410A
• Use pressure performance of 5.09MPa·G or over.
3Electronic weighing scale —
4Gas leak detector • Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check • Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder • Only for R410A · Top of cylinder (Pink)
• Cylinder with syphon
8Refrigerant recovery equipment —
Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
• Refer to the owchart below to determine if the existing pipes can be used and if it is necessary to use a lter dryer.
• If the diameter of the existing pipes is different from the specied diameter, refer to technological data materials to conrm if
the pipes can be used.
▼
▼
▼
▼
▼
▼▼
Measure the existing pipe thickness and
check for damage.
The existing pipe thickness meets specica-
tions and the pipes are not damaged.
Check if the existing air conditioner can operate.
After operating the cooling system for about 30
minutes, do a pump down work.
Disconnect the existing air conditioner from the
pipes.
Attach the new air conditioner
Test run The existing pipes cannot be reused.
Use new pipes.
Note:
If the existing air conditioner cannot operate, use a
refrigerant recovery device to collect the refrigerant.
Note:
In case existing pipes were used for gas or oil heat
pump systems, be sure to clean the pipes.
The existing pipe thickness does not meet
specications or the pipes are damaged.

5
OCH670
(2) Cautions for refrigerant piping work
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.
1Thickness 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 or below.)
2Dimensions 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 its working pressure is higher than that of other refriger-
ants. Therefore, to enhance airtightness and strength, flare cutting dimension of copper pipe for R410A has been speci-
fied 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 strength as shown below. Set copper pipe correctly referring to copper pipe flaring
dimensions for R410A below. For 1/2 and 5/8 inch pipes, the dimension B changes.
Use torque wrench corresponding to each dimension.
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
0.8
0.8
0.8
1.0
—
0.8
0.8
0.8
1.0
1.0
Nominal
dimensions(inch)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness (mm)
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
9.1
13.2
16.6
19.7
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions(inch)
Flare cutting dimensions
Outside
diameter
Dimension A ( )
+0
-0.4
(mm)
R410A R22
(mm)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
17.0
22.0
26.0
29.0 *
—
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions(inch)
Flare nut dimensions
Outside
diameter
Dimension B
R410A
* 36.0mm for
indoor unit
R22
(mm)
(mm)
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 thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
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 refri-
gerant 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 and alkylbenzene
oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adap-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adapter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adapter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: 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.
Dimension A
Dimension B

6
OCH670
3 SPECIFICATIONS
Service Ref
PUHZ-P100VKA.TH PUHZ-P100VKA.TH-ET PUHZ-P100VKA.TH-ER PUHZ-P125VKA.TH PUHZ-P125VKA.TH-ET PUHZ-P125VKA.TH-ER PUHZ-P140VKA.TH PUHZ-P140VKA.TH-ET PUHZ-P140VKA.TH-ER PUHZ-P100YKA.TH PUHZ-P100YKA.TH-ET PUHZ-P100YKA.TH-ER PUHZ-P125YKA.TH PUHZ-P125YKA.TH-ET PUHZ-P125YKA.TH-ER PUHZ-P140YKA.TH PUHZ-P140YKA.TH-ET PUHZ-P140YKA.TH-ER
Power supply
(phase,cycle,voltage) Single phase, 50 Hz, 230 V 3-phase, 50 Hz, 400 V
Max. current A 20 26.5 30 11.5 11.5 11.5
External nish Munsell 3Y 7.8/1.1
Refrigerant control Linear Expansion Valve
Compressor Hermetic
Model
SNB220FBGMT MNB33FBDMC-L MNB33FBDMC-L SNB220GBAMT MNB33FBDMC-L MNB33FBDMC-L
Motor output kW 1.5 2.5 2.5 1.5 2.5 2.5
Starter type Direct input
Protection devices Shell thermistor
H.P. switch
Heat exchanger Plate n coil
Fan Fan(drive) x No. Propeller fan x 1
Fan motor output kW 0.200
Air volume
K/min
79 87 87 79 87 87
Noise level
Cooling SPL(db) 51 54 56 51 54 56
Heating SPL(db) 54 56 57 54 56 57
Cooling SPL(db) 70 72 75 70 72 75
Dimensions W
mm(inch) 1,050 (41-5/16)
D
mm(inch) 330+40 (13+1-3/16)
H
mm(inch) 981 (38-5/8)
Weight kg 76 84 84 78 85 85
Refrigerant R410A
Charge kg 3.3 3.8 3.8 3.3 3.8 3.8
Oil (Model) cc 700 (FV50S) 1100 (FV50S) 1100 (FV50S) 700 (FV50S) 1100 (FV50S) 1100 (FV50S)
REFRIGERANT PIPING
Pipe size O.D Liquid mm(inch) 9.52 (3/8)
Gas
mm(inch) 15.88 (5/8)
Connection method Indoor side Flared
Outdoor side Flared
Between the indoor
& Outdoor unit
Height difference Maximum 30 m
Piping length Maximum 50 m

7
OCH670
4DATA
4-1. REFILLING REFRIGERANT CHARGE (R410A : kg)
0.88
0.88
0.88
0.95
0.95
0.95
0.95
0.95
0.95
MNB33FBDMC-L
PUHZ-P125/140VKA.TH(-ET/-ER)
Service Ref.
Compressor model
(at 20°C)
U-V
U-W
W-V
Winding
Resistance
( ")
PUHZ-P125/140YKA.TH(-ET/-ER)
PUHZ-P100VKA.TH(-ET/-ER) PUHZ-P100YKA.TH(-ET/-ER)
SNB220FBGMT SNB220FBAMT
Service Ref. Piping length (one way) Initial
charged
30m 40m 50m
PUHZ-P100VKA.TH(-ET/-ER)
0 0.6 1.2
3.3
PUHZ-P125VKA.TH(-ET/-ER) 3.8
PUHZ-P140VKA.TH(-ET/-ER)
PUHZ-P100YKA.TH(-ET/-ER) 3.3
PUHZ-P125YKA.TH(-ET/-ER) 3.8
PUHZ-P140YKA.TH(-ET/-ER)
4-2. COMPRESSOR TECHNICAL DATA

8
OCH670
4-3. NOISE CRITERION CURVES
1.5m
1m
MICROPHONE
UNIT
GROUND
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
COOLING
HEATING
MODE
54
56
SPL(dB) LINE
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
COOLING
HEATING
MODE
56
57
SPL(dB) LINE
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
COOLING
HEATING
MODE
51
54
SPL(dB) LINE
PUHZ-P100VKA.TH(-ET/-ER)
PUHZ-P100YKA.TH(-ET/-ER)
PUHZ-P125VKA.TH(-ET/-ER)
PUHZ-P125YKA.TH(-ET/-ER)
PUHZ-P140VKA.TH(-ET/-ER)
PUHZ-P140YKA.TH(-ET/-ER)

9
OCH670
4-4. STANDARD OPERATION DATA
The unit of pressure has been changed to MPa based on international SI system.
The conversion factor is : 1(MPa)=10.2(kgf/cm²)
Representative matching PUHZ-P100 PUHZ-P125 PUHZ-P140
Mode COOLING HEATING COOLING HEATING COOLING HEATING
Total Capacity W 9.4 11.2 12.1 13.5 13.6 15.0
input kW 3.18 3.26 4.10 4.06 5.42 4.67
Electrical
circuit
Indoor PLA-RP100EA.UK PLA-RP125EA.UK PLA-RP140EA.UK
Phase, Hz 1, 50 1, 50 1, 50
Voltage V 230 230 230
Current A 0.46 0.44 0.66 0.64 0.66 0.64
Outdoor PUHZ-P100VKA
PUHZ-P100YKA
PUHZ-P125VKA
PUHZ-P125YKA
PUHZ-P140VKA
PUHZ-P140YKA
Phase, Hz 1, 50 3, 50 1, 50 3, 50 1, 50 3, 50
Voltage V
230 400 230 400 230 400
Current A 14.0/5.0 14.0/5.0 18.0/6.5 17.5/6.5 23.5/9.0 20.5/7.5
Refrigerant
circuit
Discharge Pressure MPa 2.79 2.68 3.00 2.62 3.21 2.78
Suction pressure MPa 0.86 0.68 0.85 0.65 0.77 0.62
Discharge temperature :77.9 78.5 76.7 69.7 88.1 72.6
Condensing temperature
:47.0 45.3 49.9 44.6 53.2 47.0
Suction temperature
:12.6 3.0 7.5 −0.8 7.9 −2.0
Ref. pipe length m 7.5 7.5 7.5
Indoor
side
Intake air
temperature
DB :27 20 27 20 27 20
WB :19 14 19 14 19 14
Discharge air
temperature DB :13.5 39.9 12.2 42.1 11.3 44.3
Outdoor
side
Intake air DB :357357357
temperature WB :246246246
SHF 0.77 — 0.73 — 0.70 —
BF 0.24 — 0.15 — 0.14 —
PUHZ-P100VKA.TH(-ET/-ER) PUHZ-P100YKA.TH(-ET/-ER)
PUHZ-P125VKA.TH(-ET/-ER) PUHZ-P125YKA.TH(-ET/-ER)
PUHZ-P140VKA.TH(-ET/-ER) PUHZ-P140YKA.TH(-ET/-ER)

10
OCH670
5OUTLINES AND DIMENSIONS
Unit: mm
PUHZ-P100VKA.TH(-ET/-ER) PUHZ-P100YKA.TH(-ET/-ER)
PUHZ-P125VKA.TH(-ET/-ER) PUHZ-P125YKA.TH(-ET/-ER)
PUHZ-P140VKA.TH(-ET/-ER) PUHZ-P140YKA.TH(-ET/-ER)

11
OCH670
6WIRING DIAGRAM
PUHZ-P100VKA.TH(-ET/-ER)
Terminal Block <Power Supply, Indoor/Outdoor>
Motor for Compressor
Fan Motor
High Pressure Switch
Thermistor <Liquid>
Thermistor <Discharge>
Thermistor <2-Phase Pipe>
Thermistor <Ambient>
Thermistor <Heat Sink>
Thermistor <Comp. Surface>
LEV-A, LEV-B
21S4
DCL
CY1, CY2
P.B.
C.B.
F1, F2, F3, F4
SW1
SW4
Linear Expansion Valve
Solenoid Valve (4-Way Valve)
Reactor
Capacitor
Power Circuit Board
Controller Circuit Board
Fuse <T6.3AL250V>
Switch
<Manual Defrost, Defect History
Record Reset, Refrigerant Address>
Switch <Function Switch>
SW5
SW6
SW7
SW8
SW9
SWP
CN31
CN51
CNDM
CNM
X52
Switch <Function Switch>
Switch
<Model Select>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Switch <Pump Down>
Connector <Emergency Operation>
Connector <Connection for Option>
Connector <Connection for Option>
Connector <Connection for Option>
Relay
SYMBOL
TB1
MC
MF1
63H
TH3
TH4
TH6
TH7
TH8
TH33
SYMBOL SYMBOLNAME NAME NAME
1 2 3 4 5 6 7 8
OFF
ON
SW6-4, 5, 6, 7, 8 *2 MODEL
100V
The black square (■) indicates a switch position.
*1. MODEL SELECT
*2. SW6-1 to 3: Function switch
P. B.
MS
3~
MC
CN6
(WH)
t°
2
1 2
CN4
(WH)
1 2
TH8
W
V
U
BK
WH
RD
W
V
U
IC600
CNDC
(PK)
1 3
2
CNAC2
(RD)
CNAC1
(WH)
LI NI
1 3 1 3
IC500
DS
E3E4 EI E2
BK
BK
BK
BK
CN2
(RD)
7
71
TB3B TB1B TB1A TB3A
BK RD RD BK
DCL
C. B.
TH6TH7 TH4TH3
t° t° t° t°
LEV-A
CNS
(WH)
CNAC
(WH)
CNDC
(PK)
F2
F1
F3
F4
CN2
(RD)
CN4
(WH)
TH7/6
(RD) TH3 (WH) TH4 (WH)
TRANS
CNVMNT
(WH) CNMNT (WH)
63H
(YE)
2
7
1 4 1 2 2 1
1 3
31 1 5
1
1 7
1
3
1
3
1 2
34
LEV-A
(WH)
51
MS
3~
MF1
CNF1
(WH)
17
63H
LEV-B
(RD)
M
LEV-B
51
M
2
31
TH33
(YE)
TH33
t°
When M-NET Adapter is connected
CN2M
(WH)
CN5
(WH)
CND
(WH)
M-NET
M-NET ADAPTER
51
5
1
2
13
3
3 5
CNM
(WH)
1 14
LED1
LED2
TB7
A B S
L N S1 S2 S3
POWER SUPPLY
~/N 230V 50Hz
TB1
RD
BU
YE
OG BN
GNYE
TO INDOOR
UNIT
CY1
CY2
2
21S4
(GN) 31
CNDM
(WH)
CN51
(WH)
31
51
21S4
X52
1 2
43
4
1
3
2
*
1
SW5SW8SWP
SW4
SW1 SW6
SW9 SW7
CN31
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a fire or communication failure.

12
OCH670
PUHZ-P125VKA.TH(-ET/-ER)
PUHZ-P140VKA.TH(-ET/-ER)
Terminal Block <Power Supply, Indoor/Outdoor>
Motor for Compressor
Fan Motor
High Pressure Switch
Thermistor <Liquid>
Thermistor <Discharge>
Thermistor <2-Phase Pipe>
Thermistor <Ambient>
Thermistor <Heat Sink>
Thermistor <Comp. Surface>
Linear Expansion Valve
21S4
DCL1, DCL2, DCL3
CY1, CY2
CX1
P.B.
C.B.
F1, F2, F3, F4
SW1
SW4
SW5
Solenoid Valve (4-Way Valve)
Reactor
Capacitor
Capacitor
Power Circuit Board
Controller Circuit Board
Fuse <T6.3AL250V>
Switch
<Manual Defrost, Defect History
Record Reset, Refrigerant Address>
Switch <Function Switch>
Switch <Function Switch>
SW6
SW7
SW8
SW9
SWP
CN31
CN51
CNDM
CNM
X52
Switch <Model Select>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Switch <Pump Down>
Connector <Emergency Operation>
Connector <Connection for Option>
Connector <Connection for Option>
Connector <Connection for Option>
Relay
SYMBOL
TB1
MC
MF1
63H
TH3
TH4
TH6
TH7
TH8
TH33
LEV-A, LEV-B
SYMBOL SYMBOLNAME NAME NAME
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
SW6-4, 5, 6, 7, 8 *2 MODEL
125V
140V
The black square (■) indicates a switch position.
*1. MODEL SELECT
*2. SW6-1 to 3: Function switch
P. B.
MS
3~
MC
CN6
(WH)
t°
2
1 2
CN4
(WH)
1 2
TH8
W
V
U
BK
WH
RD
W
V
U
IC600
CNDC
(PK)
1 3
2
CNAC2
(RD)
CNAC1
(WH)
LI NI
1 3 1 3
IC500
DS
E3E4 EI E2
BK
BK
BK
BK
CN2
(RD)
7
71
TB3B TB1B TB2B
TB1A TB2A TB3A
BK WH RD RD BKWH
DCL1
DCL2
DCL3
C. B.
TH6TH7 TH4TH3
t° t° t° t°
LEV-A
CNS
(WH)
CNAC
(WH)
CNDC
(PK)
F2
F1
F3
F4
TH7/6
(RD) TH3 (WH) TH4 (WH)
TRANS
CNVMNT
(WH) CNMNT (WH)
63H
(YE)
1 4 1 2 2 1
1 3
31 1 5
1
3
1
3
1 2
34
LEV-A
(WH)
51
21S4
(GN) 31
MS
3~
MF1
CNF1
(WH)
17
63H
LEV-B
(RD)
M
LEV-B
51
M
2CNDM
(WH)
CN51
(WH)
31
51
31
TH33
(YE)
TH33
t°
When M-NET Adapter is connected
CN2M
(WH)
CN5
(WH)
CND
(WH)
M-NET
M-NET ADAPTER
51
5
1
2
13
3
3 5
CNM
(WH)
1 14
LED1
LED2
21S4
TB7
A B S
X52
L N S1 S2 S3
POWER SUPPLY
~/N 230V 50Hz
TB1
RD
BU
YE
OG BN
GNYE
TO INDOOR
UNIT
CY1
CY2
CX1
CN2
(RD)
CN4
(WH)
2
7
1
1 7 2
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a fire or communication failure.
*1
SW5SW8SWP
SW4
SW1 SW6
SW9 SW7
CN31

13
OCH670
PUHZ-P100YKA.TH(-ET/-ER)
PUHZ-P125YKA.TH(-ET/-ER)
PUHZ-P140YKA.TH(-ET/-ER)
Terminal Block <Power Supply>
Terminal Block <Indoor/Outdoor>
Motor for Compressor
Fan Motor
High Pressure Switch
Thermistor <Liquid>
Thermistor <Discharge>
Thermistor <2-Phase Pipe>
Thermistor <Ambient>
Thermistor <Heat Sink>
Thermistor <Comp. Surface>
Linear Expansion Valve
21S4
ACL4
DCL
RS
CY1, CY2
P.B.
N.F.
C.B.
Solenoid Valve (4-Way Valve)
Reactor
Reactor
Resistor
Capacitor
Power Circuit Board
Noise Filter Circuit Board
Controller Circuit Board
Fuse <T6.3AL250V>
Switch
<Manual Defrost, Defect History
Record Reset, Refrigerant Address>
Switch <Function Switch>
SW5
SW6
SW7
SW8
SW9
SWP
CN31
CN51
CNDM
CNM
X52
F1, F2, F3, F4
S
W1
SW4
Switch
<Function Switch>
Switch <Model Select>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Switch <Pump Down>
Connector <Emergency Operation>
Connector <Connection for Option>
Connector <Connection for Option>
Connector <Connection for Option>
Relay
SYMBOL
TB1
TB2
MC
MF1
63H
TH3
TH4
TH6
TH7
TH8
TH33
LEV-A, LEV-B
SYMBOL SYMBOLNAME NAME NAME
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
SW6-4, 5, 6, 7, 8 *2 MODEL
100Y
1 2 3 4 5 6 7 8
OFF
ON
125Y
140Y
The black square (■) indicates a
switch position.
*1. MODEL SELECT
*2. SW6-1 to 3: Function switch
P.B.
U
POWER
SUPPLY
3N~
400V 50Hz
TB1
VW
RD
WH
BK
MC
7
L 1
L 2
L 3
N
N.F.
CNAC1
(WH)
13
CNDC
(PK)
13
CNL
(BU)
13
CNAC2
(RD)
13
CNCT
(RD) 1 2
LO1
LO2
LO3
EI
NI
LI1
LI2
LI3
E3
S1
S2
S3
2
RD
WH
BK
BU
RD
WH
BK
TB2
RD
WH
BK
YE
OG
BN
RD
GNYE
21S4
(GN) 31
21S4
X52
BK
E2
BKBK
TO INDOOR
UNIT
1 2
CN6
(WH)
1 2
CN5
(RD) CN2 (RD)
1 7 1 2
CN4
(WH)
TB-U TB-V
TB-W
L3IN
TB-L2
TB-L1
TH8
t°
RD
MS
3~
22
CY1 CY2
C. B.
TH6TH7 TH4
t° t° t°
CNS
(WH)
CNAC
(WH)
CNDC
(PK)
F2
F1
F3
F4
CN2
(RD)
CN4
(WH)
TH7/6
(RD) TH4 (WH)
TRANS
CNVMNT
(WH) CNMNT (WH)
63H
(YE)
2
7
1 4 2 1
TH3
t°
TH3
(WH)
1 2
RD RD
1 3
31 1 5
1 2
17
1
3
1
3
1 2
34
MS
3~
MF1
CNF1
(WH)
17
63H
LEV-B
(RD)
LEV-B
51
M
LEV-A
(WH)
LEV-A
51
M
2
CNDM
(WH)
CN51
(WH)
3
1
5
1
1 3
TH33
(YE)
TH33
t°
When M-NET adapter is connected
CN2M
(WH)
CN5
(WH)
CND
(WH)
M-NET
M-NET ADAPTER
TB7
A B S
51
5
1
2
13
3
3 5
CNM
(WH)
1 14
LED1
LED2
TB-L3
X52CB
L3OUT
DCL
RS
X52CA
TB-P1 TB-P3
BK
ACL4 2
*1
SW5SW8SWP
SW4
SW1 SW6
SW9 SW7
CN31
Never splice the power cable or the indoor-outdoor connection cable,
otherwise it may result in a smoke, a fire or communication failure.

14
OCH670
7WIRING SPECIFICATIONS
1
2
S1
S2
S3
S1
S2
S3
Indoor/outdoor
unit connection
cable
Indoor
unit
Unit
power
supply
Outdoor
unit
Remote
controller
L
BN
BEarth leakage breaker
Cwiring circuit breaker or
isolating switch
C
1:1 system Electrical wiring
Notes: 1. Wiring size must comply with the applicable local and national code..
2. Power supply cables and Indoor/Outdoor unit connecting cables shall not be lighter than polychloroprene sheathed flexible cable.
3. Install an earth line longer than power cables.
Warning:
In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between
power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch 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.
(Design 60245 IEC 57)
S1
S2
S3
S1
S2
S3
A-Control
Outdoor Unit
3 poles isolator
Power supply
Isolator
A-Control
Indoor Unit
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a re or communication failure.
7-1. FIELD ELECTRICAL WIRING (power wiring specifications)
Outdoor unit model PUHZ-P100/125VKA PUHZ-P140VKA PUHZ-P100/125/140YKA
Outdoor unit power supply ~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V
3N~ (3 ph 4-wires), 50 Hz, 400 V
Outdoor unit input capacity Main switch (Breaker) *1 32 A 40 A 16 A
Wiring Wire
No. × size
(mm2)
Outdoor unit power supply 3 × Min. 4 3 × Min. 6 5 × Min. 1.5
Indoor unit-Outdoor unit *2 3 × 1.5 (Polar) 3 × 1.5 (Polar) 3 × 1.5 (Polar)
Indoor unit-Outdoor unit earth *2 1 × Min. 1.5 1 × Min. 1.5 1 × Min. 1.5
Remote controller-Indoor unit *3 2 × 0.3 (Non-polar) 2 × 0.3 (Non-polar) 2 × 0.3 (Non-polar)
Circuit rating
Outdoor unit L-N (single)
Outdoor unit L1-N, L2-N, L3-N (3 phase) *4 230 V AC 230 V AC 230 V AC
Indoor unit-Outdoor unit S1-S2 *4 230 V AC 230 V AC 230 V AC
Indoor unit-Outdoor unit S2-S3 *4 24 V DC 24 V DC 24 V DC
Remote controller-Indoor unit *4 12 V DC 12 V DC 12 V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
Make sure that the current leakage breaker is one compatible with higher harmonics.
Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter.
The use of an inadequate breaker can cause the incorrect operation of inverter.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
• Use one cable for S1 and S2 and another for S3 as shown in the picture.
• Max. 50 m Total Max. for PEY. Wiring size 3 × 1.5 (Polar).
*3. The 10 m wire is attached in the remote controller accessory.
*4. The gures 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.
Caution: Be sure to install N-Line. Without N-Line, it could cause damage to the unit.

15
OCH670
7-2. SEPARATE INDOOR UNIT/ OUTDOOR UNIT POWER SUPPLIES
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.
S1
S2
L
N
1
2
L
N
S1
S2
S3
S3
A
CB
D
J
E
F
G
H
Affix a label B that is included with the manuals near each wiring diagram for the indoor and outdoor units.
AOutdoor unit power supply
BEarth leakage breaker
CWiring circuit breaker or isolating switch
DOutdoor unit
EIndoor unit/outdoor unit connecting cords
FRemote controller
GIndoor unit
HOption
JIndoor unit power supply
If the indoor and outdoor units have separate power supplies, refer to the table below.
If the optional indoor power supply terminal kit is used, change the indoor unit
electrical box wiring referring to the figure in the right and the DIP switch settings of
the outdoor unit control board.
Indoor power supply terminal kit (option)
Indoor unit electrical box connector con-
nection 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)
Indoor unit specifications
Required
Required
Required
Electric heater
(For models with
heater)
Connectors (connections when shipped
from the factory are for indoor unit power
supplied from outdoor unit)
Indoor unit power supplied from outdoor unit
(when shipped from factory)
If the indoor and
outdoor units have
separate power
supplies, change the
connections of the
connectors as shown
in the following
figure.
Connectors
Indoor unit
control board
Separate indoor unit/outdoor unit power
supplies
Electric heater
(For models with
heater)
S1
S2
S3
L
N
BLUE BLUE
YELLOW YELLOW
CND
CN01
ORANGE
CN01
ORANGE
S1
S2
S3
L
N
YELLOW
BLUE
BLUE
YELLOW
CND
Indoor unit
control board
Note:
There are 3 types of labels (labels A, B, and C). Affix the appropriate labels to
the units according to the wiring method.
ON
OFF
Set the SW8-3 to ON.
1 2 (SW8)
3
CB
Simultaneous twin/triple system
Affix a label B that is included with the manuals near each wiring diagram for the indoor and outdoor units.
<For models without heater>
The optional indoor power supply terminal kit is required.
A
B
C
D
E
F
G
H
J
Outdoor unit power supply
Earth leakage breaker
Wiring circuit breaker or isolating switch
Outdoor unit
Indoor unit/outdoor unit connecting cables
Remote controller
Indoor unit
Option
Indoor unit power supply
KIndoor unit earth
E
F
D G
K K
H
G
H
G
H
L
N
L
N
S1
S2
S3
S1
S2
S3
1
2
L
N
S1
S2
S3
1
2
L
N
S1
S2
S3
1
2
AB C B C J
*1. A breaker with at least 3 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductor of the supply.
*2. Max. 120 m
*3. Max. 500 m (Max. 200 m when 2 remote controllers are used)
*4.The figures are NOT always against the ground.
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Power supply cables and indoor unit/outdoor unit connecting cables shall not be lighter than polychloroprene sheathed
flexible cable. (Design 60245 IEC 57)
3. Install an earth line longer than power cables.
Indoor unit model
Indoor unit power supply
Indoor unit input capacity *1
Main switch (Breaker)
Indoor unit power supply
Indoor unit power supply earth
Indoor unit-Outdoor unit *2
Indoor unit-Outdoor unit earth
Remote controller-Indoor unit *3
Indoor unit L-N *4
Indoor unit-Outdoor unit S1-S2 *4
Indoor unit-Outdoor unit S2-S3 *4
Remote controller-Indoor unit *4
50–140
~/N (single), 50 Hz, 230 V
16 A
3 oMin. 1.5
1 oMin. 1.5
2 oMin. 0.3
–
2 o0.3 (Non-polar)
230 V AC
–
24 V DC
12 V DC
Circuit
rating
Wiring
Wire No. osize
(mm
2
)

16
OCH670
7-3. INDOOR – OUTDOOR CONNECTING CABLE
The cable shall not be lighter than design 60245 IEC or 60227 IEC.
Note: The Max. cable length may vary depending on the condition of installation, humidity or materials, etc.
Indoor unit-Outdoor unit
Outdoor power supply
Max. 45m
3 o1.5 (polar)
1 oMin. 1.5
Max. 50m
3 o2.5 (polar)
1 oMin. 2.5
Indoor unit-Outdoor unit earth
Wire No. oSize (mm²)
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.
Indoor unit-Outdoor unit
Indoor/Outdoor separate
power supply Max. 120m
2 oMin. 0.3
—
Indoor unit-Outdoor unit earth
Wire No. oSize (mm²)
Note: The optional indoor power supply terminal kit is necessary

17
OCH670
7-4. M-NET WIRING METHOD
(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 220–240 V power supply. If it is connected,
electronic parts on M-NET P.C. board may burn out.
(3) Use 2-core × 1.25mm² 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.
It would be acceptable if M-NET wire (non-polar, 2-cores) is arranged in addition to the wiring for A-control.
(4) Earth 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.
If there are more than 2 earthing spots on the shield wire, noise may enter into the shield wire because the earth wire and
shield wire form 1 circuit and the electric potential difference occurs due to the impedance difference among earthing spots.
In case of single spot earthing, noise does not enter into the shield wire because the earth wire and shield wire do not form
1 circuit.
To avoid communication errors caused by noise, make sure to observe the single spot earthing method described in the
installation manual.
Group
remote
controller
Refrigerant
address 00
M-NET
address 01
A-control
remote
controller
A-control
remote
controller
A-control
remote
controller
Refrigerant
address 00
M-NET
address 02
Refrigerant
address 00
M-NET
address 03
Power
supply
unit for
transmission
wire
Central
remote
controller
M-NET transmission wire
×Bad example (Multi spot earthing of shield wire)
Good example 1 (Single spot earthing of shield wire)
Power
supply
appliance
M-NET type
outdoor unit
Central
remote
controller
Power
supply
appliance
M-NET type
outdoor unit
M-NET type
outdoor unit M-NET type outdoor unit
M-NET transmission wire
M-NET type
outdoor unit M-NET type outdoor unit
Central
remote
controller
Power
supply
appliance
M-NET type
outdoor unit
M-NET transmission wire
M-NET type
outdoor unit M-NET type outdoor unit
Good example 2 (Single spot earthing of shield wire)

18
OCH670
7-4-3. Regulations in address settings
In the 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.
Note: Refrigerant addresses can be overlapped if they are in the different group.
Note:
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 “3” 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”.
7-4-1. 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
system, 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 1st digit and SW12 for 2nd digit), which
is located on the M-NET board of outdoor unit.
(Initial setting: all addresses are set to “0”.)
7-4-2. Refrigerant address setting
In the case of multiple grouping system (multiple refrigerant circuits in 1 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 set-
ting 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”.)]
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1 2
~
50
M-NET Address No. <Setting example>
Switch
setting
SW11
1st
digit
SW12
2nd
digit
OFF
ON
123456123456123456123456123456123456123456123456
123456 123456 123456 123456 123456 123456 123456 123456
0
Refrigerant
address
OFF
ON
8
OFF
ON
1
OFF
ON
9
OFF
ON
10
OFF
ON
11
OFF
ON
12
OFF
ON
13
OFF
ON
14
OFF
ON
15
OFF
ON
2
OFF
ON
3
OFF
ON
4
OFF
ON
5
OFF
ON
6
OFF
ON
7
System
controller
A-control
remote
controller
Group A Group B Group C
A-control
remote
controller
TB5
A-control
remote
controller
Refrigerant
address 00
M-NET
address 01
Refrigerant
address 00
M-NET
address 02
Refrigerant
address 01
M-NET
address 03
Refrigerant
address 00
M-NET
address 04
Power
supply
unit for
transmission
wire
A-control
remote
controller
A-control
remote
controller
TB5
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
Refrigerant
address 01
M-NET
address 03
Refrigerant
address 02
M-NET
address 05
System
controller
Power
supply
unit for
transmission
wire
M-NET wiring
(1) Use 2-core × 1.25mm² 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 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 earth
wire on the plate as shown on the right figure.
Transmission
wire Shield part
M-NET
terminal
block Earth
wire
A B S

19
OCH670
8REFRIGERANT SYSTEM DIAGRAM
Unit : mm (inch)
Thermistor (TH8)
<Heat Sink>
Refrigerant LIQUID pipe
connection [9.52 (3/8)
Stop valve
(with charge plug)
Strainer
#100
Power
receiver LEV-A
Strainer
#100
High pressure
switch 63H
Thermistor TH4
(Discharge)
Thermistor TH33
(Comp. surface)
Compressor
Strainer
#50
Strainer
#100
Strainer
#100
4-way valve
Muffler
Charge plug
Charge plug
Stop valve
Refrigerant GAS pipe
connection [15.88 (5/8)
Refrigerant flow in cooling
Refrigerant flow in heating
Heat exchanger Thermistor TH6
(Condenser)
Thermistor TH7
(Ambient)
Thermistor TH3
(Liquid)
Distributor
LEV-B
PUHZ-P100VKA.TH(-ET/-ER) PUHZ-P100YKA.TH(-ET/-ER)
PUHZ-P125VKA.TH(-ET/-ER) PUHZ-P125YKA.TH(-ET/-ER)
PUHZ-P140VKA.TH(-ET/-ER) PUHZ-P140YKA.TH(-ET/-ER)

20
OCH670
8-2. 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) can be set up.
1Turn on SW4-1 to start test run.
2Turn 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 no problem with product
because the linear expansion pipe 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 no problem with product because the check valve itself, generates the sound because pressure difference is small in the
refrigerant circuit.
8-1. REFRIGERANT COLLECTING (PUMP DOWN)
When relocating or disposing of the indoor/outdoor unit, pump down the system following the procedure below so that no refriger-
ant is released into the atmosphere.
1Turn off the power supply (circuit breaker).
2Connect the low pressure valve on the gauge manifold to the charge plug (low pressure side) on the outdoor unit.
3Close the liquid stop valve completely.
4Supply power (circuit breaker).
● When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CEN-
TRALLY CONTROLLED” is displayed, the refrigerant collecting (pump down) cannot be completed normally.
● Startup 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.
5Perform the refrigerant collecting operation (cooling test run).
● Push the pump-down SWP switch (push-button type) on the control board of the outdoor unit. The compressor and ventila-
tors (indoor and outdoor units) start operating (refrigerant collecting operation begins). (LED1 and LED2 on the control board
of the outdoor unit are lit.)
● Only push the pump-down SWP switch if the unit is stopped. However, even if the unit is stopped and the pump-down SWP
switch is pushed less than 3 minutes after the compressor stops, the refrigerant collecting operation cannot be performed.
Wait until the compressor has been stopped for 3 minutes and then push the pump-down SWP switch again.
6Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge on the gauge manifold shows 0.05
to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm²) and quickly stop the air conditioner.
● Because the unit automatically stops in about 3 minutes when the refrigerant collecting operation is completed (LED1 off,
LED2 lit), be sure to quickly close the gas stop valve. However, if LED1 is lit, LED2 is off, and the unit is stopped, open the
liquid stop valve completely, close the valve completely after 3 minutes or more have passed, and then repeat step 5. (Open
the gas stop valve completely.)
● 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.
● Note that when the extension piping is very long with a large refrigerant amount, it may not be possible to perform a pump-
down operation. In this case, use refrigerant recovery equipment to collect all of the refrigerant in the system.
7Turn off the power supply (circuit breaker), remove the gauge manifold, and then disconnect the refrigerant pipes.
Warning:
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
• If the refrigerant pipes are disconnected while the compressor is operating and the stop valve is open, the pressure in
the refrigeration cycle could become extremely high if air is drawn in, causing the pipes to burst, personal injury, etc.