Mitsubishi Electric PKFY-P15VBM-E Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES.........................2
2. SAFETY PRECAUTION..........................2
3. PART NAMES AND FUNCTIONS..........6
4. SPECIFICATION.....................................9
5. OUTLINES AND DIMENSIONS............11
6. WIRING DIAGRAM...............................12
7. REFRIGERANT SYSTEM DIAGRAM........14
8. TROUBLESHOOTING..........................14
9. DISASSEMBLY PROCEDURE.............21
Indoor unit
[Model names] [Service Ref.]
PKFY-P15VBM-E PKFY-P15VBM-E
PKFY-P20VBM-E PKFY-P20VBM-E
PKFY-P20VBM-ER1
PKFY-P25VBM-E PKFY-P25VBM-E
PKFY-P25VBM-ER1
No. OCH418
REVISED EDITION-A
INDOOR UNIT
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R407C R22R410A
Note:
•This manual describes only
service data of the indoor
units.
•RoHS compliant products
have <G> mark on the spec
name plate.
November 2008
Model name
indication PARTS CATALOG (OCB418)
Revision:
•PKFY-P15VBM-E and PKFY-
P20/25VBM-ER1 are added
in REVISED EDITION-A.
•Some descriptions have
been modified.
•Plase void OCH418.

2
1TECHNICAL CHANGES
[1] Cautions for service
·After recovering the all refrigerant in the unit, proceed to working.
·Do not release refrigerant in the air.
·After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant.
Cautions for units utilizing refrigerant R407C
CAUTIONS RELATED TO NEW REFRIGERANT
Do not use the existing refrigerant piping.
The old refrigerant and lubricant in the existing piping
contain a large amount of chlorine which may cause the
lubricant deterioration of the new unit.
Use “low residual oil piping”
If there is a large amount of residual oil (hydraulic oil, etc.)
inside the piping and joints, deterioration of the lubricant
will result.
Use ESTR , ETHER or HAB as the lubricant to
coat flares and flange connection parts.
If large amount of mineral oil enters, that can cause
deterioration of refrigerant oil etc.
Use liquid refrigerant to charge the system.
If gas refrigerant is used to seal the system, the composition
of the refrigerant in the cylinder will change and performance
may drop.
Do not use a refrigerant other than R407C.
If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the lubricant deterioration.
Use a vacuum pump with a reverse flow check valve.
The vacuum pump oil may flow back into the refrigerant
cycle and cause the lubricant deterioration.
Store the piping to be used indoors during
installation and both ends sealed until just
before brazing.
(Store elbows and other joints in a plastic bag.)
If dust, dirt, or water enters the refrigerant cycle,
deterioration of the oil and compressor trouble may result. Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
2SAFETY PRECAUTION
PKFY-P20VBM-E PKFY-P20VBM-ER1
PKFY-P25VBM-E PKFY-P25VBM-ER1
INDOOR CONTROLLER BOARD (I.B.) has been changed.

33
[3] Service tools
Use the below service tools as exclusive tools for R407C refrigerant.
[2] Refrigerant recharging
(1) Refrigerant recharging process
1Direct charging from the cylinder.
·R407C cylinder available on the market has a syphon pipe.
·Leave the syphon pipe cylinder standing and recharge it.
(By liquid refrigerant)
(2) Recharge in refrigerant leakage case
·After recovering the all refrigerant in the unit, proceed to working.
·Do not release the refrigerant in the air.
·After completing the repair service, recharge the cycle with the specified amount of
liquid refrigerant.
Gravimeter
Unit
No. Tool name Specifications
Gauge manifold ·Only for R407C
·Use the existing fitting SPECIFICATIONS. (UNF7/16)
·Use high-tension side pressure of 3.43MPa·G or over.
Charge hose ·Only for R407C
·Use pressure performance of 5.10MPa·G or over.
—
Electronic scale
Gas leak detector ·Use the detector for R134a or R407C.
Adapter for reverse flow check ·Attach to vacuum pump.
—
—
Refrigerant charge base
Refrigerant cylinder ·For R407C ·Top of cylinder (Brown)
·Cylinder with syphon
Refrigerant recovery equipment

4
Cautions for units utilizing refrigerant R410A
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.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
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 refrige-
rant can cause deterioration 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.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
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.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Do not use the existing refrigerant piping.
The old refrigerant and lubricant in the existing piping
contains a large amount of chlorine which may cause the
lubricant deterioration of the new unit.
Use “low residual oil piping”
If there is a large amount of residual oil (hydraulic oil, etc.)
inside the piping and joints, deterioration of the lubricant
will result.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

5
[1] Cautions for service
(1) Perform service after collecting 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.)
Gravimeter
Unit
[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 scale
4Gas leak detector ·Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check ·Attach to vacuum pump.
6Refrigerant charge base
7Refrigerant cylinder ·Only for R410A ·Top of cylinder (Pink)
·Cylinder with syphon
8Refrigerant recovery equipment

6
3PART NAMES AND FUNCTIONS
Indoor unit
Filter
Grille
Louver
Air outlet
Air intake
Vane

77
°F°C
°F°C
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
●
●
Display Section
For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.
Identifies the current operation
Shows the operating mode, etc.
*Multilanguage display is available.
“Centrally Controlled” indicator
Indicates that operation from the
remote controller has been prohib-
ited by a master controller.
“Timer is Off” indicator
Indicates that the timer is off.
Temperature Setting
Shows the target temperature.
Day-of-Week
Shows the current day of the week.
Time/Timer Display
Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, the time to be
switched off is shown.
“Sensor” indication
Displayed when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller but-
tons have been locked.
“Clean The Filter” indicator
To be displayed on when it is time to
clean the filter.
Timer indicators
The indicator comes on if the corre-
sponding timer is set.
Up/Down Air Direction indica-
tor
The indicator shows the direc-
tion of the outcoming airflow.
“One Hour Only” indicator
Room Temperature display
Shows the room temperature. The room
temperature display range is 8–39.
The display blinks if the temperature
is less than 8or 39or more.
Louver display
Indicates the action of the swing louver.
Does not appear if the louver is not
running.
(Power On indicator)
Indicates that the power is on.
Fan Speed indicator
Shows the selected fan speed.
Ventilation indicator
Appears when the unit is running in
Ventilation mode.
Operation Section
Temperature setting buttons
Down
Up
Timer Menu button
(Monitor/Set button)
Mode button (Return button)
Set Time buttons
Back
Ahead
Timer On/Off button
(Set Day button)
Opening the
lid
ON/OFF button
Fan Speed button
Filter button
(<Enter> button)
Test Run button
Check button (Clear button)
Airflow Up/Down button
Louver button
( Operation button)
To return operation
number
Ventilation button
( Operation button)
To go to next operation
number
Note:
“PLEASE WAIT” message
This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.
“NOTAVAILABLE” message
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.
Built-in temperature sensor
Displayed if the airflow is set to
Low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
at which time the airflow direction
also changes.
Wired remote controller

8
Wireless remote controller
ON/OFF TEMP
FAN
VANE
TEST RUN
AUTO STOP
AUTO START
h
min
LOUVER
MODE
CHECK
RESETSET CLOCK
MODEL SELECT
NOTAVAILABLE
CHECK TEST RUN
°C
AMPM
AMPM
VANE CONTROL button
Used to change the air flow direction.
CLOCK button
RESET button
SET button
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
LOUVER button
Changes left/right airflow direction.
(Not available for this model.)
MODE SELECT button
Used to switch the operation mode between
cooling, drying, fan, heating and auto mode.
CHECK-TEST RUN button
Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.
FAN SPEED SELECT button
Used to change the fan speed.
TIMER display
Displays when in timer operation or when
setting timer.
button
SET TEMPERATURE button sets any desired
room temperature.
CLOCK display
Displays the current time.
“ ” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
+In case the outdoor unit is cool only type,
the heating and auto mode are not
available.
Buttons used to set the “hour and minute” of
the current time and timer settings.
h and min buttons
display
display
FAN SPEED display indicates which fan
speed has been selected.
display
The vertical direction of air flow is indicated.
display
Blinks when model is selected.
display
display
CHECK and TEST RUN display indicate that
the unit is being checked or test-run.
display
OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.
TIMER CONTROL buttons
AUTO STOP (OFF timer): when this switch is
set, the air conditioner will be automatically
stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.
MODEL SELECT
CHECK TEST RUN
SET TEMP. display indicates the set desired
temperature.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.

99
*1 Nominal cooling conditions
Note : Indoor :
Outdoor :
Pipe length :
Level difference :
27°CDB/19°CWB (81°FDB/66°FWB)
35°CDB (95°FDB)
7.5 m (24-9/16 ft)
0m (0 ft)
*2 Nominal cooling conditions
27°CDB/19.5°CWB (81°FDB/67°FWB)
35°CDB (95°FDB)
5m (16-3/8 ft)
0m (0 ft)
*3 Nominal heating conditions Unit converter
20°CDB (68°FDB)
7°CDB/6°CWB (45°FDB/43°FWB)
7.5 m (24-9/16 ft)
0 m (0 ft)
* Due to continuing improvement, above specification may be subject to change without notice.
* Nominal conditions *1, *3 are subject to JIS B8615-1.
kcal/h = kW × 860
Btu/h = kW × 3,412
cfm = m3/min × 35.31
lb = kg/0.4536
*Above specification data is
subject to rounding variation.
Model
Power source
Cooling capacity
(Nominal)
Heating capacity
(Nominal )
External finish
External dimension H x W x D
Net weight
Heat exchanger
Fan
Noise level (Low-Mid2-Mid1-High)
(measured in anechoic room)
Insulation material
Air filter
Protection device
Refrigerant control device
Connectable outdoor unit
Diameter of
refrigerant pipe
Field drain pipe size
Standard
attachment
Remark
Power input
Current input
Power input
Current input
Type x Quantity
External
static press.
Motor type
Motor output
Driving mechanism
Airflow rate
(Low-Mid2-Mid1-High)
Liquid
Gas
Document
Accessory
Optional parts
External LEV Box
Installation
kW
kcal/h
Btu/h
kcal/h
kW
A
kW
kcal/h
Btu/h
kW
A
mm
in.
kg (lb)
Pa
mmH2O
kW
m3/min
L/s
cfm
dB <A>
mm (in.)
mm (in.)
mm (in.)
*1
*1
*1
*2
*3
*3
*3
(R410A)
(R22, R407C)
(R410A)
(R22, R407C)
Installation Manual, Instruction Book
1-phase 220-240V 50Hz, 1-phase 220V 60Hz
Cross fin (Aluminum fin and copper tube)
1-phase induction motor
Direct-driven by motor
Polyethylene sheet
PP honeycomb
Fuse
LEV
R410A, R407C, R22 CITY MULTI
PKFY-P20VBM-E(R1)
Plastic, MUNSELL (1.0Y 9.2/0.2)
2.2
1,900
7,500
2,000
0.04
0.20
2.5
2,200
8,500
0.04
0.20
295 × 815 × 225
11-5/8" × 32-1/8" × 8-7/8"
10 (23)
Line flow fan × 1
0
0
0.017
4.9 - 5.2 - 5.6 - 5.9
82 - 87 - 93 - 98
173 - 184 - 198 - 208
29 - 31 - 34 - 36
PKFY-P25VBM-E(R1)
2.8
2,400
9,600
2,500
0.04
0.20
3.2
2,800
10,900
0.04
0.20
295 × 815 × 225
11-5/8" × 32-1/8" × 8-7/8"
10 (23)
Line flow fan × 1
0
0
0.017
4.9 - 5.2 - 5.6 - 5.9
82 - 87 - 93 - 98
173 - 184 - 198 - 208
29 - 31 - 34 - 36
I.D. 16mm (5/8")
PAC-SG95LE-E
I.D. 16mm (5/8")
PAC-SG95LE-E
ø6.35 (ø1/4")
ø6.35 (ø1/4")
ø12.7 (ø1/2")
ø12.7 (ø1/2")
Flare
Flare
Flare
Flare
ø6.35 (ø1/4")
ø6.35 (ø1/4")
ø12.7 (ø1/2")
ø12.7 (ø1/2")
Flare
Flare
Flare
Flare
PKFY-P15VBM-E
1.7
1,450
5,800
1,500
0.04
0.20
1.9
1,600
6,500
0.04
0.20
295 × 815 × 225
11-5/8" × 32-1/8" × 8-7/8"
10 (23)
Line flow fan × 1
0
0
0.017
4.9 - 5.0 - 5.2 - 5.3
82 - 83 - 87 - 88
173 - 177 - 184 - 187
29 - 31 - 32 - 33
I.D. 16mm (5/8")
PAC-SG95LE-E
ø6.35 (ø1/4")
ø6.35 (ø1/4")
ø12.7 (ø1/2")
ø12.7 (ø1/2")
Flare
Flare
Flare
Flare
Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to
the Installation Manual.
4SPECIFICATION
4-1. SPECIFICATIONS

10
4-2. ELECTRICAL PARTS SPECIFICATIONS
Parts name
Model Symbol
TH21
TH22
TH23
FUSE
MF
C1
MV
LEV
TB2
TB5
Resistance 0/15k, 10/9.6k, 20/6.3k, 25/5.4k, 30/4.3k, 40/3.0k
Resistance 0/15k, 10/9.6k, 20/6.3k, 25/5.4k, 30/4.3k, 40/3.0k
Resistance 0/15k, 10/9.6k, 20/6.3k, 25/5.4k, 30/4.3k, 40/3.0k
250V 6.3A
4-Pole Output 17W / PS4V17-KB
1.5× 440V
MSFBC20 DC12V
(L, N, ) 250V 20A
(M1, M2) 250V 10A
Liquid pipe thermistor
Gas pipe thermistor
Fan motor capacitor
Linear expansion valve
PKFY-P20VBM-E(R1) PKFY-P25VBM-E(R1)
Room temperature
thermistor
Fuse
(Indoor controller board)
Fan motor
(with thermal fuse)
Vane motor
(with limit switch)
Power supply terminal
block
Transmission terminal
block
DC12V Stepping motor drive
Port :3.2 (0~2000pulse)
PKFY-P15VBM-E

1111
M1 M2
NL
60mm or more for left and left back piping.
Terminal block
Air intake (Direction)
Terminal block Detailed
Address board
The first side
The second side
Transmission (DC 24-30V)
MA-remote controller (DC8.7-13V)
There is not MA-remote controller terminal block. Connection with MA-remote controller refers to Note.3
Note.1 Use M10 or W3/8 screw for installation plate. Note.2 Extension piping side. Note.3 In case of connecting MA-remote controller, please connect
MA-remote controller cable (accessory) to the connector.
Power supply (220-240V)
Transmission
Power supply
Address board Detailed Address setting digit
Mode selection
* Address board is protected With PL cover. Remove the screw with driver on the occasion of setting.
Connection No.
Address board
Knockout hole of right piping
Knockout hole of remocon wiring
(Direction)
Knock of hole
Knockout hole for remocon wiring
4-4.5%35 hole
Installation plate
R
15
Knockout hole for under piping
R
8
10
50
16 2.5
45 91.5
Installation plate balance point hole
4-4.5%40 hole
4-4.5%37 hole
12- 2.8 hole:
4-:9 hole
8-:4.3 hole 87- 5.1 hole:Piping hole :65
Detail of installation plate
R
8
R
12
54
R
15
Detailed figure dwg(A B C) (Knock out hole)
Knockout hole for left piping
R
8
45
R
15
24.4
3
5
4510
10
34
162.5
504
Air intake
Air outlet
Air outlet (Direction)
Installation plate
Installation space
:16mm(I.D)
1/2F(:12.7mm)
1/4F(:6.35mm)
Drain pipe
Liquid pipe
Gas pipe
Refrigerant piping
Min 22mm Min 20mm
Min 100mm
Max 90mm
Min 50mm
Receiver
Operation lamp
DEFROST/STAND BY lamp
Emergency operation switch <Heating>
Emergency operation switch <Cooling>
37.8
7
640
Air intake
Air intake
815
115
106.7
3
295
60
640
Air intake
695
Air outlet
225 5
110
116
660
(Drain pipe total 760)
450
Gas pipe
520
Liquid pipe
100.614
783
74.6
0
97.5
180
0
159
0
27.5
125
53
45
298
235
205
175
0
170
65
40
128
124
90
159 168
113
87
135
110
35 10
0
328
102.5
15
122.5
133
72.5
85
47.5
60
22.5
407.5
328
295
260
225
190
155
120
85
30
407.5
298
260
225
190
155
120
85
30
10
10
5044
175
235
170
205
Air outlet
PKFY-P20, 25VBM-ER1
Unit : mm
PKFY-P15, 20, 25VBM-E
OUTLINES AND DIMENSIONS
5

12
Mark Meaning
LED1 Main power supply Main power supply (indoor unit:220-240V)
power on lamp is lit
Function
LED on indoor board for service
ON
OFF 1234
MODELS SW2
P20
ON
OFF 1234
MODELS SW2
P25
<*1>
LED2 Power supply for
MA-Remote controller Power supply for MA-Remote controller on lamp is lit
PKFY-P20, 25VBM-E
Legend
Symbol
I.BCN32
CN51
CN52
SW2
SW2
SW3 TH21
TH22
Remote switch
Centrally control
Remote indication
Capacity code
Mode selection Room temp.detection
(0/15k,25/5.4k)
Pipe temp.detection/liquid
(0/15k,25/5.4k)
Name
Indoor controller board
P.B
W.B
Indoor power board
ZNR Varistor
FUSE
Fuse (6.3A 250V)
F.C Fan phase control
MF Fan motor
C1 Capacitor (fan motor)
MV Vane motor
LEV Linear expansion valve
Connector
Switch
Switch
Thermistor
Symbol
TB2
TB5 Power supply
Transmission
Address board
Mode selection
Name Symbol Name
Terminal
block
TH23
Pipe temp.detection/Gas
(0/15k,25/5.4k)
Note
1. At servicing for outdoor unit, always follow the wiring diagram of outdoor unit.
2. In case of connecting MA-remote controller, please connect MA-remote controller cable in an accessory
to the connector . (Remote controller wire is non-polar.)
3. In case of using M-NET, please connect to TB5 (Transmission line is non-polar.)
4. Symbols used in wiring diagram above are, : terminal block, : connector
5. The setting of the SW2 dip switches differs in the capacity. For the detail, refer to the fig :*1.
6. Please set the switch SW5 according to the power supply voltage.
Set SW5 to 240V side when the power supply is 230 and 240 volts.
When the power supply is 220 volts, set SW5 to 220V side.
12
A.B SW1
SW1
SW5
RU
BZ
LED1 LED (Operation indicator: Green)
LED (Preparation for heating: Orange)
Emergency operation (Heat)
Emergency operation (Cool)
LED2
SW11
SW12
SW14
Voltage selection
Address setting 1s digit
Address setting 10ths digit
Connection No.
Switch
Receving unit
Buzzer
Wireless remote controller board
MV
M
RED
WHT(PNK)
BLU
ORN
YLW
CN5V
VANE
(BLU)
CN52CN51
CN41
CN32
6
5
9
CN60
LEV
(WHT)
BRN
RED
BLU
ORN
YLW
WHT
9
CN3A
MA-
REMOCON
(BLU)
MF
FAN
(GRN) CND
(RED)
CN2M
M-NET
(BLU)
TO OUTDOOR UNIT
BC CONTROLLER
M-NET REMOTE CONTROLLER
DC24-30V
BREAKER
(16A)
FUSE
(16A)
PULL
BOX
TB2
TO NEXT
INDOOR UNIT
POWER SUPPLY
~/N 220-240V 50Hz
~/N 220V 60Hz
RED RED WHT BLK BLU
GRN /YLW
BLU BLU
1
TB5
2
TO MA-REMOTE
CONTROLLER
DC8.7-13V
ORN ORN
ZNR FUSE
250V
6.3A
C1
LED1
CN35P
(BLU)
F.C
CN53P
(RED)
CN53M
(RED)
CN35M
(BLU)
LED2
CN29
GAS
(BLK)
CN21
LIQUID
(WHT)
TH23 TH22
CN20
INTAKE
(RED)
TH21
CN81
ADDRESS
(RED)
(RED)
ADDRESS
CN82
CN42
ADDRESS
(RED)
(RED)
ADDRESS
CN43
SW2SW3
123456789 10
1234
ON
OFF
I.B
See fig :*1
SW5
SW1
220V 240V
A.B
W.B
ON
OFF
0
SW12
10ths
DIGIT
0
SW11 0
SW14
1s
DIGIT BRANDH
No.
P.B
4
8
12345678910
4
1
11 112
12 13
2
13
13
146
13 14
56 CN90
WIRELESS
(WHT)
91
141 8
1
1
5
5
8
1
1
5
6
1
LED2
CNB
RU
SW2SW1
LED1
BZ
t° t° t°
M
M
1~
LEV M1M2
U
L
N
13 12
1515
WIRING DIAGRAM6

1313
Mark Meaning
LED1 Main power supply Main power supply (indoor unit:220-240V)
power on lamp is lit
Function
LED on indoor board for service
ON
OFF 1234
MODELS SW2
P20 ON
OFF 1234
MODELS SW2
P25
<*1>
LED2 Power supply for
MA-Remote controller Power supply for MA-Remote controller on lamp is lit
PKFY-P15VBM-E
Legend
Symbol
I.BCN32
CN51
CN52
SW2
SW2
SW3 TH21
TH22
Remote switch
Centrally control
Remote indication
Capacity code
Mode selection Room temp.detection
(0/15k,25/5.4k)
Pipe temp.detection/Liquid
(0/15k,25/5.4k)
Name
Indoor controller board
P.B
W.B
Indoor power board
ZNR Varistor
FUSE
Fuse (T6.3AL 250V)
F.C Fan phase control
MF Fan motor
C1 Capacitor (Fan motor)
MV Vane motor
LEV Linear expansion valve
Connector
Switch
Switch
Thermistor
Symbol
TB2
TB5 Power supply
Transmission
Address board
Mode selection
Name Symbol Name
Terminal
block
TH23
Pipe temp.detection/Gas
(0/15k,25/5.4k)
Note
1. At servicing for outdoor unit, always follow the wiring diagram of outdoor unit.
2. In case of using MA-remote controller, please connect MA-remote controller cable in an accessory
to the connector . (Remote controller wire is non-polar.)
3. In case of using M-NET, please connect to TB5 (Transmission line is non-polar.)
4. Symbols used in wiring diagram above are, : terminal block, : connector
5. The setting of the SW2 dip switches differs in the capacity. For the detail, refer to the fig :*1.
6. Please set the switch SW5 according to the power supply voltage.
Set SW5 to 240V side when the power supply is 230 and 240 volts.
When the power supply is 220 volts, set SW5 to 220V side.
12
A.B SW1
SW1
SW5
RU
BZ
LED1 LED (Operation indicator: Green)
LED (Preparation for heating: Orange)
Emergency operation (Heat)
Emergency operation (Cool)
LED2
SW11
SW12
SW14
Voltage selection
Address setting 1s digit
Address setting 10ths digit
Connection No.
Switch
Receving unit
Buzzer
Wireless remote controller board
M
CN5V
VANE
(BLU)
CN52CN51
CN41
CN32
6
5
9
CN60
LEV
(WHT)
BRN RED
BLU
ORN
YLW WHT
9
CN3A
MA-
REMOCON
(BLU)
MF
FAN
(GRN) CND
(RED)
CN2M
M-NET
(BLU)
TO OUTDOOR UNIT
BC CONTROLLER
M-NET REMOTE CONTROLLER
DC24-30V
BREAKER
(16A)
FUSE
(16A)
PULL
BOX
TB2
TO NEXT
INDOOR UNIT
POWER SUPPLY
~/N 220-240V 50Hz
~/N 220V 60Hz
RED RED WHT BLK BLU
GRN /YLW
BLU BLU
1TB5 2
TO MA-REMOTE
CONTROLLER
DC8.7-13V
ORN ORN
ZNR FUSE
250V
6.3A
C1
LED1
CN35P
(BLU)
F.C
CN53P
(RED)
CN53M
(RED)
CN35M
(BLU)
LED2
CN29
GAS
(BLK)
CN21
LIQUID
(WHT)
TH23 TH22
CN20
INTAKE
(RED)
TH21
CN81
ADDRESS
(RED)
(RED)
ADDRESS
CN82
CN42
ADDRESS
(RED)
(RED)
ADDRESS
CN43
SW2SW3
123456789 10
1234
ON
OFF
I.B
See fig :*1
SW5
SW1
220V 240V
A.B
W.B
ON
OFF
0
SW12
10ths
DIGIT
0
SW11 0
SW14
1s
DIGIT BRANCH
No.
P.B
4
8
12345678910
4
1
11 112
12 13
2
13
13
146
13 14
56 CN90
WIRELESS
(WHT)
91
141 8
1
1
5
5
8
1
LED2
CNB
RU
SW2SW1
LED1 BZ t° t° t° M
1~
LEV
M1M2
U
L
N
13 12
1515
ON
OFF 1234
MODELS SW2
P15
PKFY-P20, 25VBM-ER1
MV
RED
WHT
BLU
ORN
YLW
1
5
M

14
TROUBLESHOOTING
8
7REFRIGERANT SYSTEM DIAGRAM
8-1. HOW TO CHECK THE PARTS
PKFY-P15VBM-E PKFY-P20VBM-E(R1) PKFY-P25VBM-E(R1)
Strainer
(#100mesh)
Strainer
(#100mesh)
Strainer
(#100mesh)
Heat exchanger
Room temperature thermistor
TH21
Gas pipe temperature thermistor
TH23
Liquid pipe temperature thermistor
TH22
Gas pipe
Liquid pipe
Flare
Linear expansion
valve
Gas pipe
PKFY-P15VBM-E PKFY-P20VBM-E(R1) PKFY-P25VBM-E(R1)
{12.7 (1/2”)
Liquid pipe {6.35 (1/4”)
Models
Item
PKFY-P15VBM-E
PKFY-P20VBM-E(R1)
PKFY-P25VBM-E(R1)
Parts name Check points
Disconnect the connector then measure the resistance using a tester.
(At the ambient temperature 10~30)
Disconnect the connector then measure the resistance valve using a tester.
(Coil temperature 20)
Vane motor (MV)
Linear expansion
valve (LEV)
Refer to the next page for the details.
Room temperature
thermistor (TH21)
Liquid pipe temperature
thermistor (TH22)
Gas pipe temperature
thermistor (TH23)
Normal
4.3k~9.6k
Abnormal
Open or short
Normal
15010%
Abnormal
(1)-(5)
White-Red
(2)-(6)
Yellow-Brown
(3)-(5)
Orange-Red
(4)-(6)
Blue-Brown Open or short
Measure the resistance between the terminals using a tester. (At the ambient temperature 25)
Normal Normal
4007%
Abnormal
-
Red-Pink or White
-
Red-Blue
-
Red-Orange
-
Red-Yellow Open or short
Measure the resistance between the terminals using a tester. (At the ambient temperature 20)
Fan motor (MF)
Abnormal
Open or short
White-Black
Red-Black
Normal
286
200
Orange
Pink or
White
Red
Ye l l o w
Blue
4
2
1
5 3
Connect pin No.
M
White
Red
Black
1
4
6
FAN
1
2
3
4
5
6
LEV
White
Yellow
Orange
Blue
Red
Brown
CN60
Unit: mm(inch)

1515
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
< Thermistor for lower temperature >
Temperature ()
Resistance (K)
4:4
3
6
5
:3
2:2
1:1
:4
:3
:2
:1
Controller board
Drive circuit
Connector(CN60)
DC12V
Brown
Red
Blue
Orange
Yellow
White
M
4
6
2
3
5
1
Blue
Brown
Yellow
Orange
Red
White
Linear expansion valve
<Thermistor Characteristic graph>
Room temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23)
Thermistor R0=15k' ± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
0:15k'
10:9.6k'
20:6.3k'
25:5.4k'
30:4.3k'
40:3.0k'
Thermistor for
lower temperature
Linear expansion valve
1Operation summary of the linear expansion valve
• Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the indoor controller board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the indoor controller board and the linear expansion valve>
1
273+t 1
273
Note : Since the number of the connector at the controller board side and the relay connector are different, follow the color of
the lead wire.

16
Output
(Phase)
Output
{11
ON
{2ON
{3OFF
{4OFF
2
OFF
ON
ON
OFF
3
OFF
OFF
ON
ON
4
ON
OFF
OFF
ON
<Output pulse signal and the valve operation>
2Linear expansion valve operation
3Troubleshooting
D
A
E
B
C
Open
Open
Extra tightening (200~800 pulse)
Pulse number
Outdoor unit R410A model : 1400 pulse
Outdoor unit R22/R407C model : 2000 pulse
Opening a valve
all the way
Close
Close
Valve position (capacity)
Closing a valve : 1 →2 →3 →4 →1
Opening a valve : 4 →3 →2 →1 →4
The output pulse shifts in above order.
• When linear expansion valve operation stops, all output phase
become OFF.
• At phase interruption or when phase does not shift in order, motor
does not rotate smoothly and motor will lock and vibrate.
• When the switch is turned on, 2200 pulse closing valve signal will
be sent till it goes to point Ain order to define the valve
position.
When the valve moves smoothly, there is no noise or vibration
occurring from the linear expansion valves : however, when the
pulse number moves from Eto Aor when the valve is locked,
more noise can be heard than in a normal situation.
• Noise can be detected by placing the ear against the screw
driver handle while putting the screw driver tip to the linear
expansion valve.
6
5
4
3
2
1
LED1k
Symptom Check points
Operation circuit
failure of the micro
processor
Disconnect the connector on the controller board, then con-
nect LED for checking.
When power is turned on, pulse signals will output for 10
seconds. There must be some defects in the operation circuit
if the LED does not light while the signals are output or keeps
lighting even after the signals stop.
Countermeasures
Exchange the indoor con-
troller board at drive circuit
failure.
Linear expansion
valve mechanism is
locked.
Valve doesn't close
completely.
Wrong connection
of the connector or
contact failure
To check the linear expansion valve, operate the indoor unit
in fan mode and at the same time operate other indoor units
in cooling mode, then check the pipe temperature <liquid
pipe temperature> of the indoor unit by the
outdoor multi controller board operation
monitor. During fan operation, linear expan-
sion valve is closed completely and if there
is any leaking, detecting temperature of
the thermistor will go lower. If the detected
temperature is much lower than the tem-
perature indicated in the remote controller,
it means the valve is not closed all the way.
It is not necessary to exchange the linear expansion valve, if
the leakage is small and not affecting normal operation.
Thermistor
(Liquid pipe)
Linear
expansion
valve
Motor will idle and make a ticking noise when the motor is
operated while the linear expansion valve is locked. This tick-
ing sound is the sign of the abnormality.
Check the color of lead wire and missing terminal of the con-
nector.
Exchange the linear expan-
sion vale.
Exchange the linear expan-
sion valve.
If large amount of refriger-
ant is leaked, exchange
the linear expansion valve.
Disconnect the connector
at the controller board,
then check the continuity.
Measure the resistance between each coil (white-red, yellow-
brown, orange-red, blue-brown) using a tester. It is normal if
the resistance is in the range of 150"±10%.
Short or breakage
of the motor coil of
the linear expansion
valve

17
8-2. FUNCTION OF DIP SWITCH
PKFY-P15VBM-E PKFY-P20VBM-E(R1) PKFY-P25VBM-E(R1)
1
2
3
4
5
6
7
8
9
10
1~4
1
2
3
4
5
6
7
8
9
10
Thermistor<Intake temperature>
position
ON OFF
Filter clogging Provide Not provide
Filter sign indication 2,500 hr 100 hr
Air intake Not effective Not effective
Remote indication switching Thermo ON signal indication Fanoutput indication
Humidifier control Fan operation at Heating mode
Thermo ON operation at
heating mode
Extra low +1
Setting air flow +1 Depends on SW1-7
Auto restart function Effective Not effective
Power ON/OFF Effective Not effective
Heat pump/Cool only Cooling only Heat pump
Louver
Vane
Vane swing
Available Not available
Vane horizontal angle Second setting First setting
Vane cooling limit angle setting Horizontal angle Down B,C
Effective Not effective
Heating 4 degree up Not effective Effective
Superheat setting temperature +2 —
—
—
—
—
—
Subcool setting temperature +2 — —
ON
OFF 12345678910
ON
OFF 12345678910
ON
OFF 1234
ON
OFF 1234
PKFY-P20VBM-E
MODEL SW2
PKFY-P25VBM-E
Address board
Indoor controller board
Indoor controller board
<Initial setting>
SW3
Function
selection
Under
suspension
SW2
Capacity
code
Before
power
supply
ON
switch
SW1
Mode
Effective
timing
Under
suspension
selection
Switch
Pole
Function Operation by switch Remarks
Built-in remote controller
Indoor unit
Changing the opening of linear
expansion valve
+
1
SW1-7
OFF
ON
OFF
ON
SW1-8
OFF
OFF
ON
ON
Fan speed
Extra low
Low
Setting air flow
Stop
+2 It is impossible to intake
the fresh air.
Set for each capacity.
+1 At cooling mode, each angle
can be used only 1 hour.
+2 Please do not use SW3-9,10
as trouble might be caused
by the usage condition.
Air flow set in case of heat
thermo OFF
NOTE:
+2
+1
ON
OFF 1234
PKFY-P15VBM-E <Initial setting>
<Initial setting>
Low +1
+3
+3 Second setting is the same
as first setting.

18
J41, J42
Wireless
remote
controller
Pair No.
Jumper
Pattern A
Setting pattern J41 J42
Indoor controller
jumper wire Pair No. of wireless
remote controller
Initial setting
A
B
D
C
—
Cut
Cut
—
—
—
Cut
Cut
0
1
3
2—
—
—
Pair No.4-9 of wireless remote controller is setting pattern D.
ON/OFF TEMP
FAN
VANE
MODE
CHECK
LOUVER
TEST RUN
AUTO STOP
AUTO START
h
min
RESET
SET CLOCK
MODEL SELECT
Model No.
Temperature
button
SET button
Pair No.
Minute
button
• To operate each indoor unit by each remote controller when installed 2 indoor
units or more are near, Pair No.setting is necessary.
Pair No.setting is available with the 4 patterns
(Setting patterns A to D). .
Make setting for J41, J42 of indoor controller board and the Pair No. of
wireless remote controller.
•You may not set it when operating it by one remote controller.
Setting for indoor unit
Jumper wire J41, J42 on the indoor controller board are cut according to
the table below.
Wireless remote controller pair number:
Setting operation
1. Press the SET button (using a pointed implimaent). Check that the
remote controller’s display has stopped before continuing.
MODEL SELECT flashes, and the model No. (3 digits) appears (steadily-lit).
2. Press the MINUTE button twice. The pair number appears flashing.
3. Press the temperature buttons to select the pair number to set.
4. Press the SET button (using a pointed implemet). The set pair number is
displayed (steadily-lit) for 3 seconds, then disappears.
0
5
9
4
8
3
7
2
6
1
SW12
10
0
5
9
4
8
3
7
2
6
1
SW11
1
0
8
F
7
E
6
D
5
C
4
B
3
A
2
9
1
SW14
0
5
9
4
8
3
7
2
6
1
SW12 0
5
9
4
8
3
7
2
6
1
SW11
0
8
F
7
E
6
D
5
C
4
B
3
A
2
9
1
SW14
Address board
Address board
Operation by switchSwitch Remarks
<Initial setting>
SW11
1s digit
address
setting
SW12
10ths digit
address
setting
SW14
Branch
No.
Setting
SW5
Voltage
selection
Rotary switch
How to set address
Example : If address is "3", remain SW12
(for over 10) at "0", and match SW11 (for 1 to 9)
with "3".
How to set branch number SW14 (Series R2 only)
Match the indoor unit’s refrigerant pipe with the BC
contoller’s end connection number
Remain other than series R2 at "0".
If the unit is used at the 230V or 240V area,
set the voltage to 240V.
If the unit is used at the 220V, set the voltage
to 220V.
Address board
2
220V 240V
220V 240V
Under
operation
or
suspension
Before
power
supply
ON
Effective
timing
Rotary switch
<Initial setting>
<Initial setting>
<Initial setting>

19
8-3. TEST POINT DIAGRAM
8-3-1. Indoor controller board
PKFY-P15VBM-E
PKFY-P20VBM-E(R1)
PKFY-P25VBM-E(R1)
CN3A
Connected to the
MA-Remote controller
Between 1 to 38.7-13V DC
(Pin1(+))
CN29
Pipe temperature
thermistor/Gas (TH23)
CN21
Pipe temperature
thermistor/Liquid (TH22)
CN90
Connected to the wireless
remote controller board (W.B)
CN60
Linear expansion valve
output (LEV)
SW3
Mode selection
CN51
Centrally control
SW2
Capacity setting
CN52
Remote indication
CN5V
Vane motor output
(MV)
CN20
Room temperature
thermistor (TH21)
CN53M
Connected to the indoor power board (CN53P)
Between 1 to 224-30V DC (non-polat)
Between 3 to 512.5-13.7V DC (Pin3(+))
Between 4 to 511.5-12.7V DC (Pin4(+))
CN35M
Connected to the indoor
power board (CN35P)
LED2
Power supply for
MA-Remote controller
CN41
Connector
(HA terminal-A)
CN32
Connector
(Remote switch)
J41, J42
Wireless remote controller
Pair No. setting
JP105
Model setting
CN81
Connected to the
address board (CN82)
CN42
Connected to the
address board (CN43)

1234 56789 10
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
A
B
C
D
E
F
0

20
8-3-2. Indoor power board
PKFY-P15VBM-E
PKFY-P20VBM-E(R1)
PKFY-P25VBM-E(R1)
FUSE
6.3A 250V
CN53P
Connected to the indoor controller board
(CN53M)
Between 1 to 224-30V DC (non-polat)
Between 3 to 512.5-13.7V DC (Pin3(+))
Between 4 to 511.5-12.7V DC (Pin4(+))
LED1
Main power supply
(Indoor unit : 220-240V)
CN35P
Connected to the indoor controller board
(CN35M)
CN2M
Connected to the terminal block (TB5)
(M-NET transmission connecting wire)
24-30V DC (non-polar)
FAN
Fan motor output (MF) CND
Power supply for
indoor controller board
Between 1 to 3220-240V AC
8-3-3. Address board
PKFY-P15VBM-E
PKFY-P20VBM-E(R1)
PKFY-P25VBM-E(R1) SW1
Function setting
SW12
Address setting
10ths digit
SW11
Address setting
1s digit