Mitsubishi Electric PKFY-P20VAM Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
CONTENTS
1. FEATURES ·········································2
2. SAFETY PRECAUTION ·····················3
3. PART NAMES AND FUNCTIONS······4
4. SPECIFICATION·································6
5. OUTLINES AND DIMENSIONS ·········8
6. WIRING DIAGRAM·····························
7. REFRIGERANT SYSTEM DIAGRAM···10
8. TROUBLESHOOTING······················11
. DISASSEMBLY PROCEDURE·········16
10. PARTS LIST ·····································1
<Indoor unit>
PKFY-P20VAM
PKFY-P25VAM
No. OC163
1 8
Models
Wall Mounted
Series PKFY
INDOOR UNIT
MODEL NAME
R407C

2
FEATURES
1
1. Compact 2 .5cm high body fits snugly in even limited spaces.
2. Lightweight 8.5kg unit easy to transport and install.
3. Auto-flap shutter enhances good looks.
4. Front power supply box for easier wiring even after installation.
The front power supp y box a ows e ectrica wiring work to be done after the indoor unit has been insta ed. For easier
insta ation, a the screws required for securing the indoor unit to the wa are accessib e from the front of the unit.
5. 5-way piping provides more flexibility in selecting installation sites.
A piping inc uding drainage can be conned from the rear, right, base, eft and eft rear of the unit, providing much
greater f exibi ity in aying out piping and se ecting insta ation sites.
Indoor unit
Wall Mounted
Series PKFY
Models
PKFY-P20VAM
PKFY-P25VAM
Cooling capacity/Heating capacity
W
2,300 / 2,600
2,900 / 3,300
kca /h
2,000 / 2,250
2,500 / 2,800

3
2SAFETY PRECAUTION
Precautions for devices that use R407C refriqerant.
Cautions for connecting with R407C outdoor unit.
.Caution:
· Do not use R407C piping after use it for R22.
· Do not use the existing refrigerant piping.
-The o d refrigerant and refrigerator oi in the existing piping contains a arge amount of ch orine which may cause the
refrigerator oi of the new unit to deteriorate.
· Use refrigerant piping made of C1220(CU-DHP) phosphorus deoxidized copper as specified in the JIS H3300
“Copper and copper alloy seamless pipes and tubes”. In addition, be sure that the inner and outer surfaces of the
pipes are clean and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other
contaminant.
-Contaminants on the inside of the refrigerant piping may cause the refrigerant residua oi to deteriorate.
· Store the piping to be used during installation indoors and keep both ends of the piping sealed until just before
brazing. (Store elbows and other joints in a plastic bag.)
-If dust, dirt, or water enters the refrigerant cyc e, deterioration of the oi and compressor troub e may resu t.
· Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.
-The refrigerator oi with degrade if it is mixed with a arge amount of minera oi .
· Use liquid refrigerant to fill the system.
-If gas refrigerant is used to sea the system, the composition of the refrigerant in the cy inder wi change and performance
may drop.
· Do not use a refrigerant other than R407C.
-If another refrigerant (R22, etc.) is used, the ch orine in the refrigerant may cause the refrigerator oi to deteriorate.
· Use a vacuum pump with a reverse flow check valve. Evacuate sufficiently for one hour, leave it put for another one
hour and be sure not to down the vacuum degree.
· Do not use the following tools that are used with conventional refrigerants.
No. Too name Specifications
1Gauge manifo d ·On y for R407C.
·Use the existing fitting SPECIFICATIONS. (UNF7/16)
·Use high-tension side pressure of 35kgf/cm2or over.
2Charge hose ·On y for R407C.
·Use pressure performance of 52kgf/cm2or over.
3E ectronic sca e
4Gas eak detector ·Use the detector for R134a or R407C.
5Adapter for reverse f ow check. ·Attach on vacuum pump.
6Refrigerant charge base.
7Refrigerant cy inder. ·For R407C ·Top of cy inder (Brown)
·Cy inder with syphon
8Refrigerant recovery equipment.
· Do not use a charging cylinder.
-Using a charging cy inder may cause the refrigerator to deteriorate.
· Be especially careful when managing the tools.
-If dust, dirt, or water gets in the refrigerant cyc e, the refrigerant may deteriorate.
· For gas leak detecter, be sure to use it only for HFC refrigerant. (same as for R134a)
· If moving, put the cap on the flare at indoor unit side to prevent to mix dust or water.
· If measures on refrigerant leackage or repair servicing, be sure to refer the manual for outdoor unit.

4
PART NAMES AND FUNCTIONS
3
● Indoor Unit
PKFY-P20VAM
PKFY-P25VAM
● Remote controller [PAR-F25MA]
● Once the operation of the unit is set, subsequent operations can on y be performed by pressing the ON/OFF button
repeated y.
TIMER button
This switches between continuous
operation and the timer operation
AIR SPEED button
The sets the venti ation fan speed.
● Operation buttons
TIMER SETTING button
This sets or switches the current
time, start time and stop time.
OPERATION SWITCH button
Press this button to switch the coo er
e ectronic dry (denumidity),
automatic and heater modes.
TEMP ADJUSTMENT button
This sets the room temperature. The
temperature setting can be
performed in 1°C units.
Setting range :
Coo er 19°C to 30°C
Heater 17°C to 28°C
CHECK-TEST RUN button
On y press this button to perform an
inspection check or test operation.
Do not use it for noma operation
FILTER button
This resets the fi ter service
indication disp ay
AIR DIRECTION button
This adjusts the vertica ang e of the
venti ation.
ON/OFF button
This switches between the operation
and stop modes each time it is
pressed. The amp on this button
ights during operation.
The mode name of the remote
contro er is indicated.
LOUVER button
This switches the horizonta fan
motion ON and OFF.
(This button does not operate in this
mode .)
Air intake gri e Air intake
Guide vane Air Out et
Aute Vane
Fi ter

5
Caution
●On y the / disp ay ights when the unit is stopped and power supp ied to the unit.
●“NOT AVAILABLE” is disp ayed when the AIR DIRECTION button are pressed.This indicates that this room unit is not
equipped with the fan dieection adjustment function and the ouver function.
● When the power is turned on, “‘HO” is indicated on the room temperature indication area for a whi e (maximum for 2
minute). It does not indicate a ma function. Operation the unit after “‘HO” indication disappear.
● When power is turned ON for the first time, it is norma that “HO” is disp ayed on the room temperature indication(For max.
2minutes.) P ease wait unti this “HO” indication disappear then start the operation.
CENTRALLY
CONTROLLED disp ay
This indicates when the unit is
contro ed by optiona features such
as centra contro type remote
contro er.
TIMER disp ay
This indicates when the continous
operation and time operation modes
are set.
It a so disp ay the time for the timer
operation at the same time as when
it is set.
OPERATION MODE disp ay
This indicates the operation mode.
STANDBY disp ay
This indicates when the standby
mode is set from the time the s eep
operation starts unti the heating air
is discharged.
DEFROST disp ay
This indicates when the defrost
operation is performed.
CHECK disp ay
This indicates when a ma function
has occurred in the unit which shou d
be checked.
CLOCK disp ay
The current time , start time and stop
time can be disp ayed in tensecond
interva s by pressing the time switch
button. The start time or stop time is
a ways disp ayed during the timer
operation.
●Display
In this disp ay examp e on the
bottom eft, a condition where a
disp ay amps ight is shown for
exp anation purposes a though this
differs from actua operation.
Operation amp
This amp ights during operation,
goes off when the unit stops and
f ashes when a ma function occurs.
POWER disp ay
This amp ights when e ectricity is
supp ied to the unit.
SET TEMPERATURE disp ay
This disp ays the se ected setting
temperature.
AIR DIRECTION disp ay
This disp ays the air direction.
ROOM TEMPERATURE disp ay
The temperature of the suction air is
disp ayed during operation. The
disp ay range is 8° to 39°C. The
disp ay f ashes 8°C when the actua
temperature is ess than 8° and
f ashes 39°C when the actua
temperature is greater than 39°C.
disp ay
This disp ay ights in the check mode
or when a test operation is
performed.
CHECK MODE
TEST RUN
This amp ights when the fi ter need
to be c eaned.
AIR SPEED disp ay
The se ected fan speed is disp ayed.
FILTER disp ay

6
4SPECIFICATION
2-1 Specification
Power Supp y
Starting Current
Fan ✕ No.
Air f ow (Note 2)
Externa stafic pressure
Fan motor output
Item
Power
Coo ing capacity
Heating capacity
Exterior <munse symbo >
Out dimensions
Heat exchanger
Fan
Insu ator
Air fi ter
Pipe dimensions
Drain pipe size
Noise eve
Product weight
Unit
[,V,Hz
Z/h
Z/h
kW
kW
A
A
—
mm
mm
mm
—
—
K/min
Pa
kW
—
—
[mm
[mm
[mm
dB (A)
kg
Coo ing
Heating
Coo ing
Heating
Height
Width
Depth
Gas side
Liquid side
PKFY-P20VAM
2,000
2,250
PKFY-P25VAM
2,500
2,800
Sing e phase ,220V-240V,50Hz
0.04
0.04
0.20
0.20
P astic munse : <2.60Y 8.66/0.69>
295
815
158
Cross fin
Linef ow fan ✕ 1
5.9-5.6-5.2-4.9
0
0.017
Po yethy ene sheet
PP honey comb
12.7 <1 / 2F>
6.35 <1 / 4F>
Outer dimeter [28 Outer diameter of the connection
36-35-33-32
8.5
E ectric
characteristic
Note 1. Rating conditions (JIS B8615)
Coo ing :Indoor 27°C DB. 19.5°C WB
Outdoor 35°C DB. 24°C WB
Heating : Indoor 21°C DB.
Outdoor 7°C DB. 6°C WB
Note 2. Air f ow and the noise eve are indicated as High-Middium 1-Middium2-Low.

7
2-2 Electrical parts specifications
Mode
Transformer
Room temperature thermistor
Liquid pipe
thermistor
Gas pipe
thermistor
Fuse
(Indoor contro er board)
Fan motor
(with therma fuse)
Fan motor capacitor
Vane motor
(with imit switch)
Liner expansion va ve
Power supp y termina b ock
Transmission termina b ock
Symbo
T
TH21
TH22
TH23
FUSE
MF
C1
MV
LEV
TB2
TB5
(Primary) 50/60Hz 220-240V (Secondry) (18.4V 1.2A)
Resistance:
0$C / 15k1, 10$C / 9.6k1, 20$C / 6.3k1, 25$C / 5.4k1, 30$C / 4.3k1, 40$C / 3.0k1
Resistance:
0$C/15k1, 10$C/9.6k1, 20$C/6.3k1, 25$C/5.4k1, 30$C/4.3k1, 40$C/3.0k1
250V 6.3A
4-Po e Output 17W / RC4V17
1.5+F ✕ 440V
MSFBC20A76 DC12V
DC12V Stepping motor drive
Port [3.2 (0~2000pu se) EDM-402ME
(L, N, ;) 264V 20A
(M1, M2,S ) 250V 10A
PKFY-P20VAM/PKFY-P25VAM

8
5OUTLINES AND DIMENSIONS
Unit : mm
783
C
D
A
B
CBA
D
25.5
159
407.5
328328
298
235
235
205
205
175
175
170
170
10
10
0
298
407.5
168 135 125 110 35 10 27.5 40 53 65 87 113 128 0
295
260
260
225
225
190
190
180
159
155
155
120
120
85
85
30
30
45
44 50
0
133
122.5
97.5
85 60
47.5 22.5
15 90
102.5
124
4-4.5✕35
4-4.5✕40
4-4.5✕37
4-11✕20
8- 4.3
0
72.5
13
Air intake dimension
Air intake
Insta ation p ate
Knock out ho e
Insta ation space
100 or more
20 or more
20 or more
130 or more
Address board
Drain pipe
Liquid pipe F are connection 1/4F
F are connection 1/2F
Insu ation out dimention 28
Insu ation Out dimention 35 Gas pipe
Refrigrant pipe
Address board is protected by the p astic cover. For the setting, remark 1-screw using the screw driver.
Insta ation p ate
Air intake dimension
Air intake dimension
Air out et dimension
Drain pipe ength
Gas pipe
Detai of Termina b ock
Termina b ock for remote contro er
Termina b ock for remote contro er Termina b ock for power supp y address board
Air out et ang e
Air out et dimention
Air out et direction
Detai of address board
Dip swich
Termina b ock
Termina b ock for power supp y
Knock out ho e for right - hand side piping
Knock out ho e for eft - hand side piping
Knock out ho e for under piping
Liquid pipe
815
630
695
660
450
520
54
50
16
45 91.5
10
34
2.5
2.5 16
450
10
45
5
45
3
R15
R15
R15
R12
R8
R8
R8
10
24.4
116
110
60
146
295
21.5
247.5
150
158
70.3
37.4
5
2.5 60
13
80
4- 9
12- 2.8
87- 5.1 65
17
3
1
1
Note1.For the insta ation, be sure to eave some space in case there is finge at edge of the ce ing. Note2. Use the M10 or W3/8 bo t for the ista ation p ate. Note3. Refer for the specification tab e it be ow .
Detai of knock out ho e (A B C)
Connection out dimention 28
Lotary switch(part No.)
Lotary switch(se f address)
Secondry
Primary
Knock out ho e for the remote contro er wiring
Knock out ho e for the remote contro er wiring
Contro wire (30v)
: Fo ow the instruction stated at Note3 for the connection with the contro wire. : There is no termina board for cont ro er.
54 or more for eft
or eft back piping
Unit transp ant parts
pipe ho e
Position detai of the tapping screw and bats at pipe intake
Center of gravity ho e for insta ation
Air intake dimention
PKFY-P20VAM,PKFY-P25VAM

9
WIRING DIAGRAM6
PKFY-P20VAM, PKFY-P25VAM
Legend
Symbo Name
TH23 Gas pipe thermistor
(0°C / 15k1, 25°C / 5.4k1)
P.B Indoor power board
ZNR Varistor
FUSE Fuse (6.3A)
F.C Fan phase contro
TTransformer
MF Fan motor
C1 Fan motor capacitor
MV Vane motor
LEV Linear expansion va ve
Symbo Name
M.B
CN32
Indoor contro er board
Remote switch connector
CN41 HA termina — A connector
CN51 Centra y contro connector
CN52 Remote indication connector
SW2 Capacity cord switch
SW3 Function se ector
TH21 Room temperature thermistor
(0°C / 15k1, 25°C / 5.4k1)
TH22 Liquid pipe thermistor.
(0°C / 15k1, 25°C / 5.4k1)
Symbo Name
TB2
TB5
Power supp y termina b ock
Transmission termina b ock
A.B Address board
SW1 <A.B> Mode se ector
SW5 <A.B> Vo tage se ector
SW11 <A.B> 1st digit address setting
SW12 <A.B> 2nd digit address setting
SW14 <A.B> Connection No. setting
T O NEXT
INDOOR UNIT
PULL
BOX
FUSE
(15A)
BREAKER
(15A)
AC220-240V
SW5
220V 240V
BLU
WHT
BLU BLU
RED
BLK RED BLU
00
M2
M1
REMOTE CONTROLLER
DC24-30V
{
BC CONTROLLER
T O OUTDOOR UNIT
S(SHIELD)
GRN/YEL
~/N 220-240VAC 50Hz
POWER SUPPLY
N
TB2
L
MICON
BOARD
(WHT)
POWER BOARD
ADDRESS
(RED)
(WHT)
REMOTE
INDICATION
CONNECTION
NO.
1ST
DIGIT
2ND
DIGIT
3RD
DIGIT
ADDRESS
(RED)
F.C
ZNR
3
1
P.B
See fig:❈1
BLU
YEL
ORN
PNK
WHT
YEL
MF
5
TH21TH23 TH22
LEV
ORN
BLU
RED
RED
BRN
MV
LED5
0
A.B
SW14
SW11SW12
SW1
1087654321
OFF
ON 1
1
8
(RED)
ADDRESS
CN43
CN82
44
8
6.3A
250V
FUSE
AC18.4V
T
C1
CND
(RED)
(GRN)
F AN1 12
14 6
12
(BLU)
M-NET
CN2M
12
LIQUID
CN21
CN53-P
MICON
BOARD
CN35-P
1
5
M.B
POWER BOARD
CN53-M 15
3
CN35-M 1
LED4 LED3 LED2 LED1
SW2
4321
0N
0FF
SW3
10
87654
3
21
5
1
CENTRALLY
CONTROL
CN51
54
11
(WHT)
CN52 CN42
(RED)
ADDRESS
18
CN81
(RED)
INTAKE
CN20
21
(WHT)
CN60
LEV
(BLK)
GAS
CN2
(GRN)
REVOLUTION
CN33
2
61 1
6
123
CN32
REMOTE
SWITCH
(WHT)
123
1234
HA
CN41
(WHT)
(BLU)
CN5V
51
TB5
Note
1. At servicing for outdoor unit, a ways fo ow the wiring diagram of outdoor unit.
2. Symbo [S] of TB5 is the shie d wire connection.
3. Symbo s used in wiring diagram above are, /: termina b ock, [: connector, ●: direct wire connection.
4. The setting of the SW2 dip switches differs in the capacity for the detai , see the tab e be ow.
5. P ease set the switch SW5 accordng to the power supp y vo tage.
SW5 to 240V side when the power supp y is 230 and 240 vo ts.
When the power supp y is 220 vo ts, set SW5 to 220V side.
[
ON
OFF
1234
MODELS SW2
PKFY-P20VAM ON
OFF
1234
MODELS SW2
PKFY-P25VAM
<❈1>
BG79N652H01

10
7REFRIGERANT SYSTEM DIAGRAM
Strainer
(#100mesh)
Strainer
(#50mesh)
Heat exchanger
Room temperature thermistor
TH21
Gas pipe thermistor
TH23
Liquid pipe thermistor
TH22
Gas pipe
F are
Linear expansion
va ve
Gas pipe
PKFY-P20VAM, PKFY-P25VAM
{12.7 <1/2F>
Liquid pipe {6.35 <1/4F>
Mode s
Item
Refrigeration pipe size (F are connection size)
PKFY-P20VAM,PKFY-P25VAM