Mitsubishi Electric PKFY-P20VAM-E User manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION ·····················2
2. PART NAMES AND FUNCTIONS······6
3. SPECIFICATION·································8
4. OUTLINES AND DIMENSIONS········10
5. WIRING DIAGRAM···························11
6. REFRIGERANT SYSTEM DIAGRAM···12
7. TROUBLESHOOTING······················12
8. DISASSEMBLY PROCEDURE·········19
9. PARTS LIST······································22
10. RoHS PARTS LIST···························25
Indoor unit
[Model names] [Service Ref.]
PKFY-P20VAM-E PKFY-P20VAM-E
PKFY-P25VAM-E PKFY-P25VAM-E
No. OC309
REVISED EDITION-A
Wall Mounted
Series PKFY
INDOOR UNIT
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R407C R22
R410A
Note:
•This manual describes only
service data of the indoor
units.
•RoHS compliant products
have <G> mark on the spec
name plate.
•For servicing of RoHS com-
pliant products, refer to the
RoHS Parts List.
Revision:
• RoHS PARTS LIST is added.
•Some descriptions have
been modified.
•Please void OC309.
July 2006
OC309A---1.qxp 06.7.7 3:47 PM Page 1

2
1SAFETY PRECAUTION
[2] Refrigerant recharging
(1) Refrigerant recharging process
1Direct charging from the cylinder.
·R407C cylinder are 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.
[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
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.
Use ESTR , ETHER or HAB as the lubricant to
coat flares and flange connection parts.
If large amount of mineral oil enter, that can cause
deterioration of refrigerant oil etc.
Use liquid refrigerant to seal the system.
If gas refrigerant is used to seal the system, the composition
of the refrigerant in the cylinder will change and performance
may drop.
Do not use a refrigerant other than R407C.
If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the 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 during installation
indoors with keep 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.
Gravimeter
Unit
OC309A---1.qxp 06.7.7 3:47 PM Page 2

3
[3] Service tools
Use the below service tools as exclusive tools for R407C refrigerant.
No. Tool name Specifications
1Gauge manifold ·Only for R407C.
·Use the existing fitting SPECIFICATIONS. (UNF7/16)
·Use high-tension side pressure of 3.43MPa·G or over.
2Charge hose ·Only for R407C.
·Use pressure performance of 5.10MPa·G or over.
3Electronic scale
4Gas leak detector ·Use the detector for R134a or R407C.
5Adapter for reverse flow check. ·Attach on vacuum pump.
6Refrigerant charge base.
7Refrigerant cylinder. ·For R407C ·Top of cylinder (Brown)
·Cylinder with syphon
8Refrigerant recovery equipment.
OC309A---1.qxp 06.7.7 3:47 PM Page 3

4
Cautions for units utilizing refrigerant R410A
Store the piping to be used during installation
indoors and keep 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.
Keep the tools with care.
If dirt, dust or moisture enter 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 enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enter, 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.
OC309A---1.qxp 06.7.7 3:47 PM Page 4

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. 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 on vacuum pump.
6Refrigerant charge base
7Refrigerant cylinder ·Only for R410A Top of cylinder (Pink)
Cylinder with syphon
8Refrigerant recovery equipment
OC309A---1.qxp 06.7.7 3:47 PM Page 5

6
2PART NAMES AND FUNCTIONS
● Indoor Unit
PKFY-P20VAM-E
PKFY-P25VAM-E
Air intake grille Air intake
Guide vane Air Outlet
Auto Vane
Filter
● Operation buttons
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
Set Temperature 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
door.
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 preceding operation
number.
Ventilation button
(Operation button)
To next operation number.
On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
● Wired remote controller
OC309A---1.qxp 06.7.7 3:47 PM Page 6

7
●Display
For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.
˚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
Identifies the current operation
Shows the operating mode, etc.
* Multilanguage display is sup-
ported.
“Centrally Controlled” indicator
Indicates that operation of the re-
mote 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, shows the time
remaining.
“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
Comes 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
Displayed if the airflow is set to
weak and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di-
rection also changes.
Room Temperature display
Shows the room temperature.
Louver display
Indicates the action of the swing
louver. Does not appear if the
louver is stationary.
(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.
Caution
●Only the Power on indicator lights when the unit is stopped and power supplied to the unit.
●If you press a button for a feature that is not installed at the indoor unit, the remote controller will display the “Not Available”
message.
If you are using the remote controller to drive multiple indoor units, this message will appear only if he feature is not
present at the parent unit.
●When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indica-
tion (For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.
OC309A---1.qxp 06.7.7 3:47 PM Page 7

8
3SPECIFICATION
3-1. SPECIFICATION
Power Supply
Starting Current
Fan ✕No.
Air flow w2
External static pressure
Fan motor output
Item
Power
Cooling capacity
Heating capacity
Exterior <munsell symbol>
Out dimensions
Heat exchanger
Fan
Insulator
Air filter
Pipe dimensions
Unit drain pipe size
Noise level w2
Product weight
Unit
[,V,Hz
kW
kW
kW
kW
A
A
—
mm
mm
mm
—
—
K/min
Pa
kW
—
—
[mm(in.)
[mm(in.)
[mm
dB
kg
Cooling
Heating
Cooling
Heating
Height
Width
Depth
Gas side
Liquid side
PKFY-P20VAM-E
2.2
2.5
PKFY-P25VAM-E
2.8
3.2
0.04
0.04
0.20
0.20
Plastic munsell : <2.60Y 8.66/0.69>
295
815
158
Cross fin
Lineflow fan ✕1
5.9-5.6-5.2-4.9
0
0.017
Polyethylene sheet
PP honey comb
12.7 (1/2")
6.35 (1/4")
PVC pipe VP-16 connectable (I.D. 16)
36-35-33-32
8.5
Electric
characteristic
Single phase, 220-230-240V, 50Hz
Single phase, 220V, 60Hz
Note 1. Rating conditions (JIS B 8615-1)
Cooling :Indoor D.B. 27°C W.B. 19°C
Outdoor D.B. 35°C
Heating : Indoor D.B. 20°C
Outdoor D.B. 7°C W.B. 6°C
ww2. Air flow and the noise level are indicated as High – Middium1 – Middium2 – Low.
OC309A---1.qxp 06.7.7 3:47 PM Page 8

9
3-2. 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
1.5µF ✕440V
MSFBC20A76 DC12V
(L, N, ;) 250V 20A
(M1, M2) 250V 10A
Liquid pipe thermistor
Gas pipe thermistor
Fan motor capacitor
Linear expansion valve
PKFY-P20VAM-E PKFY-P25VAM-E
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)
OC309A---1.qxp 06.7.7 3:47 PM Page 9

10
4OUTLINES AND DIMENSIONS
Unit : mm
783
C
D
B
CBA
D
25.513
Air intake dimension
Air intake dimension
Air outlet dimension
Drain pipe length
Gas pipe
Detail of Terminal block
Terminal block for transmission
Terminal block for transmission Terminal block for power supply Address board
Terminal block for power supply
Knock out hole for right - hand side piping
Knock out hole for left - hand side piping
Knock out hole 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
2.5 60
13
Detail of knock out hole (A B C)
Secondary
Primary
Knock out hole for the remote controller wiring
Knock out hole for the remote controller wiring
: In case of connecting MA remote controller, use the cable with the connector attached to the indoor unit. Please connect the cable with the connector with the lead wire and connector (Relay connector) for the MA remote controller of indoor controller board. : There is no terminal board for MAremote controller.
Air intake dimension
PKFY-P20VAM-E
PKFY-P25VAM-E
A
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
Air intake dimension
Air intake Installation plate
Knock out hole
Installation space
100 or more
20 or more
20 or more
130 or more
Address board
Drain pipe
Liquid pipe Flare connection 1/4F
Flare connection 1/2F
Gas pipe
Refrigerant pipe
Address board is protected by the plastic cover. For the setting, remark 1-screw using the screw driver.
Installation plate
Air outlet angle
Air outlet dimension
Air outlet direction
Detail of address board
Dip switch
Terminal block
158
70.3
37.4
5
80
4- 9
12- 2.8 87- 5.1 65
17
3
1
1
Note1. For the installation, be sure to leave some space in case there is fringe at edge of the ceiling. Note2. Use the M10 or W3/8 bolt for the installation plate. Note3. Refer for the specification table it below .
Connection inner dimension [16
Lotary switch(part No.)
Lotary switch(self address)
54 or more for left
or left back piping
Unit transplant parts
pipe hole
Position detail of the tapping screw and bats at pipe intake
Center of gravity hole for installation
OC309A---1.qxp 06.7.7 3:47 PM Page 10

11
WIRING DIAGRAM5
12
to the connector . (Remote controller wire is non-polar.)
TB5
TB2
N
L
TO NEXT
INDOOR UNIT
PULL
BOX
FUSE
(15A)
~/N 220V 60Hz
~/N 220-230-240V 50Hz
BREAKER
(15A)
POWER SUPPLY
GRN/YLW
ORN
ORN
PKFY-P20VAM
Models
OFF
ON Models SW2
<w1>
SW2
PKFY-P25VAM
4321 4321
OFF
ON
Mark
LED1
LED2
Meaning
Main power supply
Function
Power supply for
MA-Remote controller
LED on indoor board for service
Main power supply(Indoor unit:220-240V)
power on lamp is lit
Power supply for MA-Remote controller
on lamp is lit
3.In case of using M-NET, please connect to TB5. (Transmission line is non-polar.)
In case of connecting MA-remote controller, please connect MA remote controller cable in an accessorie2.
CN35P
MICON
BOARD
(BLU)
CN53P
MICON
BOARD
(RED)
(BLU)
(RED)
POWER BOARD
POWER BOARD
CN53M
CN35M
CN43
ADDRESS
(RED)
(RED)
ADDRESS
CN82
SW5
220V 240V
3RD
DIGIT 2ND DIGIT 1ST DIGIT CONNECTION
NO.
See fig: w1
(WHT)
CENTRALLY
CONTROL (GRN)
REMOTE
INDICATION (RED)
ADDRESS (RED)
ADDRESS (BLU) CN20
INTAKE
(RED)
(BLU)
(GRN)
(RED)
BLU RED
BLK
RED WHT BLU
BLU
M-NET REMOTE CONTROLLER
TO OUTDOOR UNIT
BC CONTROLLER
CONTROLLER
TO MA-REMOTE
LIQUID
(WHT)
(BLK)
GAS
(GRN)
PNK
YLW
ORN
BLU
RED
SWITCH
(WHT)
(WHT)
(WHT)
RED
WHT
YLW
ORN
BLU
BRN
6.
5.
4.
1. Note
The setting of the SW2 dip switches differs in the capacity. For the detail, refer to the fig: w1.
Symbols used in wiring diagram above are, : terminal block, : connecter.
At servicing for outdoor unit, always follow the wiring diagram of outdoor unit.
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.
block
Terminal
Switch
Circuit board
Power supply
Transmission
Address board
Mode selection
Address setting 1st digit
Connection No.
Address setting 2nd digit
Name
Voltage selection
Vane motorMV
Fan motor
(0:/15T,25:/5.4T)TB5
TB2
SW14<A.B>
SW12<A.B>
SW11<A.B>
SW1<A.B>
A.B
Pipe temperature,detection/Gas
Capacitor(fan motor)C1
MF
TH23 Thermistor
SW3
SW2 Switch
CN52
CN51
CN41
CN32 Indoor controller board
NameSymbol
M.B
Legend
Connector Remote switch
HA terminal-A
Centrally control
Remote indication
Mode selection
Capacity code
P.B Indoor power board
Symbol Name Symbol
ZNR Varistor
Fuse (6.3A)FUSE Fan phase controlF.C
(0:/15T,25:/5.4T)
Pipe temperature,detection/liquid
(0:/15T,25:/5.4T)
Room temperature,detection Thermistor
TH21
TH22 Linear expansion valveLEV
SW5<A.B>
CN5V
(BLU) CN41
HA REMOTE
CN32 CN34 CN29
LEV
CN60
CN3A
CN81CN42
CN52CN51
12345678910
SW3
0FF
0N
1234
SW2
LED2
M.B
CN21
CN2M
M-NET
FAN
CND
C1
FUSE
250V
6.3A
8
4
ON
OFF 12345678910
SW1
SW12 SW11 SW14
A.B
00 0
LED1
TH22TH23 TH21
5
MF
M1 M2
DC24-30V
DC8.7-13V
{
P.B
ZNR
F.C
MV
{
21
LEV 6
654321 12345 4321 123 123 1 2 21
32145 32145 4123 612345 78 31 12
13245
123
1
2
3
4
5
6
7
8
1
2
3
4
5
4
2
3
1
321
12 146 13
1
2
3
4
5
6
1
2
3
4
5
PKFY-P20VAM-E
PKFY-P25VAM-E
OC309A---1.qxp 06.7.7 3:47 PM Page 11

TROUBLESHOOTING
7
12
6REFRIGERANT SYSTEM DIAGRAM
7-1. HOW TO CHECK
PKFY-P20VAM-E PKFY-P25VAM-E
Strainer
(#100mesh)
Strainer
(#50mesh)
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-P20VAM-E PKFY-P25VAM-E
{12.7 (1/2”)
Liquid pipe {6.35 (1/4”)
Models
Item
PKFY-P20VAM-E
PKFY-P25VAM-E
Parts name Check points
Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 10:~30:)
Disconnect the connector then measure the resistance valve using a tester.
(Coil temperature 20:)
Vane motor
Linear expansion
valve
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. (Surrounding temperature 25:)
Normal Normal
200"±7%
Abnormal
1-2
Red-Pink 1-3 Red-Blue 1-4 Red-Orange 1-5 Red-Yellow Open or short
1Measure the resistance between the terminals using a tester. (Surrounding temperature 20:)
2Without disassembling the parts, measure the electrical pressure of the gray wire (Signal line) and
brown wire (GND) while the power is on.
Fan motor
Abnormal
Open or short
White-Black
Red-Black
Normal
195"
200"
Abnormal
Normal
(1) At first, check if the electrical pressure is 12V between the brown wire (GND)
and yellow wire (VCC).
(2) Slowly start running the fan. It is normal if while the fan rotate once, the
electrical pressure change from 0V to12V then go back to 0V.
If the electrical pressure stay at around 0V or 10V, it means the fan motor has
the defects.
Blue
Yellow
Red Orange
Pink
3
5
1
4 2
Connect pin No.
M
White
Red
Black
Brown Gray Yellow
CN34
1
4
6
321
FAN
1
2
3
4
5
6
LEV
White
Yellow
Orange
Blue
Red
Brown
CN60
OC309A---1.qxp 06.7.7 3:47 PM Page 12

13
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=3480K ± 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 open/close 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.
OC309A---1.qxp 06.7.7 3:47 PM Page 13

14
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>
➁Linear expansion valve operation
➂Trouble shooting
D
A
E
B
C
Open
Extra tightning (80~100pulse)
Pulse number
2000 pulse
Opening a valve
all the way
Close
Valve position (capacity)
6
5
4
3
2
1
LED1k'
Symptom Check points
Operation circuit fail-
ure of the micro
processor.
Disconnect the connector on the controller board, then con-
nect LED for checking.
Pulse signal will be sent out for 10 seconds as soon as the
main switch is turn on. If there is LED with lights on or lights
off, it means the operation circuit is abnormal.
Countermeasures
Exchange the indoor con-
troller board at drive circuit
failure.
Linear expansion
valve mechanism is
locked.
Valve doesn't close
completely (thermis-
tor leaking).
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
expansion valve is closed completely and if
there are some leaking, detecting tempera-
ture of the thermistor will go lower. If the
detected temperature is much lower than
the temperature 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 making any trouble.
Thermistor
Linear
expansion
valve
Motor will idle and make ticking noise when motor is operated
while the linear expansion valve is locked. This ticking sound
is the sign of the abnormality.
Check the color of lead wire and missing terminal of the con-
nector.
Exchange the linear
expansion valve.
Exchange the linear
expansion valve.
If large amount of thermis-
tor is leaked, exchange the
linear expansion valve.
Disconnect the connector
at the controller board,
then check the continuity.
Measure the resistance between the each coil (red-white,
red-orange, brown-yellow, brown-blue) 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.
Closing a valve : 1 → 2 → 3 → 4 → 1
Opening a valve : 4 → 3 → 2 → 1 → 4
The output pulse shift in above order.
❈ 1. When linear expansion valve operation stops, all output phase
become OFF.
2. At phase interruption or when phase does not shift in order,
motor does not rotate smoothly and motor lock, and vibrates.
❈ When the switch is turned on, 2200 pulse closing valve signal
will be send till it goes to Apoint in order to define the valve
position.
When the valve move smoothly, there is no noise or vibration
occurring from the linear expansion valve ; however, when the
pulse number moves from Eto Aor when the valve is locked,
more noise can be heard than normal situation.
❈ Noise can be detected by placing the ear against the screw dri-
ver handle while putting the screw driver to the linear expansion
valve.
OC309A---1.qxp 06.7.7 3:47 PM Page 14

15
7-2. FUNCTION OF DIP SWITCH
PKFY-P20VAM-E PKFY-P25VAM-E
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 Thermostat ON signal indication Fan output indication
Humidifier control Fan operation at Heating mode Heat thermostat ON is operating
Low Extra low
Setting air flow Reset to SW1-7
Auto restart function Effective Not effective
Power ON/OFF Effective Not effective
Heat pump/Cool only Cooling only Heat pump
Capacity save Available Not available
Vane Available Not available
Not available Available
Vane horizontal angle Second setting First setting
Vane cooling limit angle setting Horizontal angle Down B,C
Effective Not effective
Heater 4 degreed up Not effective Effective
Target Superheat setting temperature 9 degreed 6 degreed
Target Subcool setting temperature 15 degreed 10 degreed
ON
OFF 12345678910
ON
OFF 12345678910
ON
OFF 1234
ON
OFF 1234
PKFY-P20VAM-E
MODEL SW2
PKFY-P25VAM-E
Address board
<At delivery>
Indoor controller board
Indoor controller board
<At delivery>
SW3
Function
selection
SW2
Capacity
code
switch
SW1
Mode
selection
Switch Pole Function Operation by switch Remarks
Built-in remote controller Indoor unit
Indoor linear expansion
valve opening
w1 SW1-7=OFF, SW1-8=ON
→Setting air flow.
SW1-7=OFF, SW1-8=ON
→Indoor fan stop.
w2 It is impossible to intake
the fresh air.
Set while the unit is off.
<At delivery>
Set for each capacity.
Set while the unit is off.
(Note 1) At cooling mode, each
angle can be used only 1
hour.
Reading change of LEV opening
on reversion of after defrosting
Air flow at heat thermostat
OFF
NOTE:
w1
w1
w1
w2
w1
OC309A---1.qxp 06.7.7 3:47 PM Page 15

16
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
<At delivery>
<At delivery>
SW11
1st digit
address
setting
SW12
2nd digit
address
setting
Rotary switch
SW14
Connection
No.
Setting
SW5
Voltage
selection
Rotary switch
Address setting should be done when M-NET
remote controller is being used.
This is the switch to be used when the indoor
unit is operated with R2 series outdoor unit
as a set.
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 can be set while the
unit is stopped.
Address board
2
220V 240V
<At delivery>
220V 240V
OC309A---1.qxp 06.7.7 3:47 PM Page 16

17
7-3. TEST POINT DIAGRAM
7-3-1. Indoor controller board
PKFY-P20VAM-E
PKFY-P25VAM-E
CN3A
Connect to the
MA-Remote controller
Between 11to 338.7-13V DC
(Pin11(+))
CN29
Pipe temperature
thermistor/Gas (TH23)
CN21
Pipe temperature
thermistor/Liquid (TH22)
CN32
Connector
(Remote switch)
CN60
Linear expansion valve
output (LEV)
SW3
Mode selection
CN51
Centrally control
SW2
Capacity setting
CN52
Remote indication
CN6V
Vane moter output
(MV)
CN20
Room temperature
thermistor (TH21)
CN53M
Connect to the indoor power board (CN53P)
Between 11to 2224-30V DC (non-polat)
Between 33to 5512.5-13.7V DC (Pin33(+))
Between 44to 5511.5-12.7V DC (Pin44(+))
CN35M
Connect to the indoor
power board (CN35P)
LED2
Power supply for
MA-Remote controller
CN41
Connector
(HA terminal-A)
CN34
Fan motor rotational
frequency input (MF)
OC309A---1.qxp 06.7.7 3:47 PM Page 17

18
7-3-2. Indoor power board
PKFY-P20VAM-E
PKFY-P25VAM-E
FUSE
6.3A 250V
CN53P
Connect to the indoor controller board
(CN53M)
Between 11to 2224-30V DC (non-polat)
Between 33to 5512.5-13.7V DC (Pin33(+))
Between 44to 5511.5-12.7V DC (Pin44(+))
LED1
Main power supply
(Indoor unit : 220-240V)
CN35P
Connect to the indoor controller board
(CN35M)
CN2M
Connect 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 11to 33220-240V AC
OC309A---1.qxp 06.7.7 3:47 PM Page 18

19
DISASSEMBLY PROCEDURE
8
OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS
1. REMOVING THE LOWER SIDE OF THE INDOOR UNIT FROM
THE INSTALLATION PLATE
When there is removing plate
(1) Remove the corner box at right lower side of the indoor
unit.
(2) Insert the removing plate at the back side of the corner box
to remove the indoor unit.
(3) Remove the hook by pulling the lower side of the indoor unit
down as shown in the figure 1.
When there is no removing plate or it can not be used for some
reason.
(1) Remove the front panel.
(2) Insert the screw driver to the corner hole at both left and
right side as shown in the figure 2.
(3) Push it up then, pull down the lower side of indoor unit and
remove the hook.
Indoor unit
removing plate
Insert
the edge Pull
Push Corner hole
12
Push Down
Be careful
not to damage
the airflow
adjustment
plate with the
screw driver.
PKFY-P20VAM-E PKFY-P25VAM-E Be careful on removing heavy parts.
Figure 1 Figure 2
2. REMOVING THE FRONT PANEL
❈Before removing the front panel, leave the open space at
upper side of air flow adjustment plate approximately 2 to 3
cm.
(1) Remove the screw caps then remove the set screws.
(Refer to the photo 1)
(2) Remove the left side of the front panel, then right side.
(3) After removing the lower side of the front panel a little,
remove it as pulling the upper side toward you.
❈Please pay attention to the nozzle assemble.
INSTALLING THE FRONT PANEL
(1) Insert the lower side of the front panel under the air
adjustment plate.
(2) Set the upper side of the front panel.
(3) Set the lower side of the front panel then fix it with the
screws.
(4) Press the area indicated as arrow sign and set it to the air
conditioner unit.
Push
4
13
2
Photo 1
Figure 3
Front panel
Set screws
Airflow adjustment plate
OC309A---1.qxp 06.7.7 3:47 PM Page 19

20
OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS
3. REMOVING THE INDOOR MICRO CONTROLLER BOARD
AND INDOOR POWER BOARD
(1) Remove the front panel. (Refer to 2)
(2) Remove the electrical box cover (screw 4 ✕10).
(Refer to the photo 2)
INDOOR MICRO CONTROLLER BOARD
(1) Disconnect the following connectors on the indoor micro
controller board.
(connector in front of)
●CN60, CN5V, CN34, CN29, CN21
●CN42, CN81, CN3A, CN20
(2) Pull out the indoor micro controller board toward you, then
disconnect the rest of connectors.
●CN53M, CN35M (See the photo 3)
INDOOR POWER BOARD
(1) Disconnect the following connectors on the indoor power
board.
●FAN, CN53P, CN35P, CN2M, CND
(2) Remove the screws of the indoor power board, then pull out
the indoor power board toward you. (See the photo 3)
Photo 2 Electrical box cover
Screw cap
Electrical box
Photo 3 Indoor micro controller board
Indoor power
board
Indoor power
board
4. REMOVING THE ELECTRICAL BOX
(1) Remove the front panel. (Refer to 2)
(2) Remove the electrical box cover.
(3) Pull the nozzle assembly toward you as opening the catch
of the nozzle assembly.
(4) Disconnect the indoor/outdoor connector.
(5) Disconnect the following connector on the indoor micro
controller board. (See the photo 4)
●CN60, CN5V, CN34, CN29, CN21, CN20, CN3A
(6) Disconnect the following connector on the indoor power
board. (See the photo 4)
●FAN, CN2M, CND
(7) Disconnect the ground wire.
(8) Pull the disconnected lead wire out from the electrical box.
(9) Push up the upper fixture catch to remove the box, then
pull the lower fixture and remove it from the box fixture.
Photo 4 Indoor micro
controller board fixture (upper)
Indoor power
board
fixture (lower)
Ground wire set screw Electrical box
Electrical box
OC309A---1.qxp 06.7.7 3:47 PM Page 20