Mitsubishi Electric PFFY-P20VKM-ER1 Operating manual

TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names] [Service Ref.]
PFFY-P20VKM-E
PFFY-P20VKM-ER1
PFFY-P25VKM-E
PFFY-P25VKM-ER1
PFFY-P32VKM-E
PFFY-P32VKM-ER1
PFFY-P40VKM-E
PFFY-P40VKM-ER1
No. OC404
REVISED EDITION-A
INDOOR UNIT
Floor Standing
Series PFFY
CONTENTS
1. TECHNICAL CHANGES.........................2
2. SAFETY PRECAUTION..........................2
3. PART NAMES AND FUNCTIONS.......... 6
4. SPECIFICATION..................................... 8
5. NOISE CRITERIA CURVES..................10
6. AIR OUTLET SELECTION....................11
7. OUTLINES AND DIMENSIONS............12
8. WIRING DIAGRAM...............................13
9. REFRIGERANT SYSTEM DIAGRAM...... 14
10. TROUBLE SHOOTING.........................15
11. DISASSEMBLY PROCEDURE.............23
12. RoHS PARTS LIST...............................28
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R407C R22
R410A
November 2008
Indication of model name
NOTE:
This service manual describes technical data of the indoor units.
• As for outdoor units refer to outdoor unit’s service manual.
• RoHS compliant products have <G> mark on the spec name plate.
• Please void OC404.
Revision:
• PFFY-P20/25/32/40
VKM-ER1 are added in
REVISED EDITION-A.
• Some descriptions have
been modified.
PFFY-P20VKM-E
PFFY-P25VKM-E
PFFY-P32VKM-E
PFFY-P40VKM-E

2
1TEHNICAL CHANGES
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 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.
SAFETY PRECAUTION
2
PFFY-P20VKM-E PFFY-P20VKM-ER1
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1
INDOOR CONTROLLER BOARD (I.B.) has been changed.

33
[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.
[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.
Gravimeter
Unit

4
Cautions for units utilizing refrigerant R410A
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 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.
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.)
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 on vacuum pump.
6Refrigerant charge base
7Refrigerant cylinder ·Only for R410A Top of cylinder (Pink)
Cylinder with syphon
8Refrigerant recovery equipment

6
PART NAMES AND FUNCTIONS
3
Indoor Unit
Louver
Louver
Air outlet
Filter
Vane
Air outlet Air inlet
Damper
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.
Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
Wired remote controller

77
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
Low 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 every unit connected.
When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication
(For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.
For the PFFY-P VKM series, the airflow direction displayed on the remote controller is different from the actual airflow direc-
tion. Refer to the following table.
Display
Actual
1234
(Horiz.) Swing
123 4
(Horiz.) Swing
The airflow direction for the lower air outlet damper cannot be set. The airflow direction is automatically controlled by a com-
puter.

8
4SPECIFICATION
4-1. Specification
Item PFFY-P20VKM-E
PFFY-P20VKM-ER1
Power source 1-phase 220-240V 50Hz
Cooling capacity kW 2.2 2.8 3.6 4.5
Heating capacity kW 2.5 3.2 4.0 5.0
Power Cooling kW 0.025 0.025 0.025 0.028
consumption Heating kW 0.025 0.025 0.025 0.028
Current Cooling A 0.20 0.20 0.20 0.24
Heating A 0.20 0.20 0.20 0.24
Height mm 600 600 600 600
Dimension Width mm 700 700 700 700
Depth mm 200 200 200 200
Weight kg 15 15 15 15
Heat exchanger Cross fin (Aluminum plate fin and copper tube)
Type Line flow fan %2
Airflow rate *2 m
3
/min 5.9-6.8-7.6-8.7 6.1-7.0-8.0-9.1 6.1-7.0-8.0-9.1 8.0-9.0-9.5-10.7
Fan
External static Pa 0
pressure
Motor Type DC motor
Output kW 0.03 %2
Air filter PP honeycomb fabric (Catechin air filter)
Refrigerant Gas (Flare) :mm :12.7
pipe dimension Liquid (Flare) :mm :6.35
Field drain pipe size :mm I.D.16(PVC pipe VP-16 connectable)
Noise level *2 dB(A)27-31-34-37 28-32-35-38 28-32-35-38 35-38-42-44
PFFY-P25VKM-E
PFFY-P25VKM-ER1
PFFY-P32VKM-E
PFFY-P32VKM-ER1
PFFY-P40VKM-E
PFFY-P40VKM-ER1
Note 1. Rating conditions (JIS B 8616)
Cooling :Indoor : D.B. 27°C W.B. 19.0°C
outdoor :D.B. 35°C
Heating : Indoor : D.B. 20°C
outdoor :D.B. 7°C W.B. 6°C
*2. Air flow and the noise level are indicated as High-Medium1-Medium2-Low.

99
Parts name
Model
Symbol
TH21
TH22
TH23
FUSE
MF1
MF2
MV1
MV2
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
(L, N, ) 330V 30A
(M1, M2, S) 250V 20A
Vane motor
Damper motor
Linear expansion valve
[coil]
PFFY-P20VKM-E
PFFY-P20VKM-ER1
Fuse
(Indoor controller board)
Fan motor (Upper)
Fan motor (Lower)
Power supply terminal
block
Transmission terminal
block
OUTPUT 30W
ARW40Z8P30MS
MP20Z
DC12V
MP35EA
DC12V
DC12V Stepping motor drive Port dimension
: 5.2 (0~2000 pulse)
EFM-40YGME
OUTPUT 30W
ARW40Y8P30MS
Thermistor
(Room temperature
detection)
Thermistor
(Pipe temperature
detection/Liquid)
Thermistor
(Pipe temperature
detection/Gas)
PFFY-P25VKM-E
PFFY-P25VKM-ER1
PFFY-P32VKM-E
PFFY-P32VKM-ER1
PFFY-P40VKM-E
PFFY-P40VKM-ER1
4-2. Electrical parts specifications

10
5NOISE CRITERIA CURVES
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27Wet-bulb temperature 19
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
44
44
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20Wet-bulb temperature 15
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27Wet-bulb temperature 19
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
37
37
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20Wet-bulb temperature 1590
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27Wet-bulb temperature 19
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
38
38
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20Wet-bulb temperature 15
PFFY-P20VKM-E PFFY-P20VKM-ER1
INDOOR UNIT
WALL
1m 1m
MICROPHONE
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1

11
AIR OUTLET SELECTION6
With this function, air comes out simultaneously from the upper and
lower air outlets so that the room can be cooled or heated effectively.
This function is set using the switch SWC on the address board.
12345678910
ON
OFF
SW1
SWC
CN82
CN43
SWC
Fig. 4-1
SWC How to set to blow out air from the upper and lower air outlets:
Set the SWC to lower side (" "). (Initial setting)
Air blows out automatically from the upper and lower air outlet as
shown in the table below.
How to set to blow out air from the upper air outlet only:
Set the SWC to upper side (" ").
Note:
Be sure to operate with the main power turned off.
Description of operation
Operation
Upper and lower air flow
Room temperature and
set temperature are dif-
ferent. +1
Upper air flow
Room temperature is
close to set temperature
or thermo-off.+1
Upper air flow only
—
Upper and lower air flow
(Normal condition (in
heating))
Upper air flow
During defrosting op-
eration, start of opera-
tion, thermo-off
Upper and lower air flow
—
COOL DRY HEAT FAN
Air flow
Conditions
• Be sure to keep the area around the damper of the lower air outlet free of any objects.
SWC
SW14
SW11
SW12
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
A
B
C
D
E
F
(10ths DIGIT) (1s DIGIT)
./ .
(BRANCH No.)
+1
Upper and lower air flow
Upper air flow
(Room temp. – Set temp.)
+2
DIP SW3-2 (on indoor controller board) : OFF (Initial Setting)
If the air conditioner has operated for 2hours with upper and lower air flow,
it changes to 8deg for next 30minutes. After 30minutes it changes back to 4deg.
DIP SW3-2 (on indoor controller board) : ON
Remains to be 4deg.
2deg 4deg +2

12
7OUTLINES AND DIMENSIONS
Unit : mm
INDOOR UNIT
60
12
19 60
125
147
454155
60
35
45
110
80
60
72
337 337
363
333210
593
7
131131
4-:6 Hole
Indoor unit
Installation plate
96
123
125
6019
12
60
128
118
165
205
20012
12
11
Gas pipe
:12.7(flared)1/2
Liquid pipe
:6.35(flared)1/4
drain
Air in
Air out
Air out
46.5 46.5
600
700
54 508 137
607
More than 100mm
More than
100mm
More than
100mm
PFFY-P20VKM-E PFFY-P20VKM-ER1
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1

13
WIRING DIAGRAM8
TH21 TH22 LSTH23
CN31
(WHT) CN60 (WHT) CN44 (WHT)
CN20
(WHT)
CN51
(WHT)
CN32
(WHT)
CNMF2
(WHT)
CNMF1
(WHT)
CN52
(GRN)
CN81
(RED)
CN42
(RED)
CND
(BLK)
CN43
(RED)
CN82
(RED)
CN36
(BLK)
1
2
BLU
BLU
I.B
TB2
L
N
GRN/YLW
TO MA-REMOTE
CONTROLLER
DC8.7-13V
A.B
SWE
SW1
SW12
10ths
DIGIT
SWC
0
SW11
1s
DIGIT
0
SW14
BRANCH
NO.
0
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
12345678910
SW3
12345678910
SW2
123456
SW4
12345
6
BLU
WHT
BRN
RED
BLK
654321 4321
4321
DC311
~339V
4321
321 321
21
LEV
LED1
LED2
654321
 
12345678
8
4
87654321
123456
CN6V1
(GRN)
ORN
ORN
BLU
123456
ORN
PNK
YLW
BRN
RED
BLU
ORN
PNK
YLW
BRN
RED
123456
CN6V2
(BLU)
123456
12345
7531 21 8642
CN3A
(BLU)
123
CN2M
(BLU)
12
MF2
BLU
BLU
WHT
BRN
RED
RED
BLK
BLK
654321
MF1
FUSE
ZNR
M1
M2
TB5
S(SHIELD)
TO OUTDOOR UNIT
BC CONTROLLER
REMOTE CONTROLLER
DC24-30V
POWER SUPPLY
220-240V
50Hz
See fig:+1
MV2 MV1
SYMBOL
I. B
CONNECTOR REMOTE SWITCH
CENTRALLY CONTROL
REMOTE INDICATION
SWITCH CAPACITY CODE
MODE SELECTION
MODEL SELECTOR
VARISTOR
FUSE (T6.3AL250V)
POWER SUPPLY (I.B)
POWER SUPPLY (I.B)
FAN MOTOR (UPPER)
FAN MOTOR (LOWER)
VANE MOTOR
DAMPER MOTOR
DAMPER LIMIT SWITCH (CLOSE)
LINEAR EXPANSION VALVE
POWER SUPPLY
TRANSMISSION
ROOM TEMP. DETECTION
(0/15k, 25/5.4k)
PIPE TEMP. DETECTION/LIQUID
(0/15k, 25/5.4k)
[LEGEND]
NAME SYMBOL NAME
MF1
MF2
MV1
MV2
LS
LEV
TB2
TB5
TH21
TH22
INDOOR CONTROLLER BOARD
CN32
CN51
CN52
SW2
SW3
SW4
ZNR
FUSE
LED1
LED2
SYMBOL
A. B
SWITCH MODE SELECTION
ADDRESS SETTING 1s DIGIT
ADDRESS SETTING 10ths DIGIT
BRANCH NO.
AIR OUTLET SELECTION
NAME
SW1
SW11
SW12
SW14
SWC
LED on indoor board for service
MEANING
MARK
Main power supply
Power supply for
MA-Remote controller
Main power supply (Indoor unit: 220-240V)
power on →Iamp is Iit
Power supply for MA-remote controller
on →Iamp is lit
FUNCTION
LED1
LED2
NOTES
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 connecter . (Remote controller wire is non-polar.)
3. In case of using M-NET, please connect to TB5. (Transmission line is non-polar.)
4. Symbol [S] of TB5 is the shield wire connection.
5. Symbols used in wiring diagram above are, : terminal block, : connector.
6. The setting of the SW2 dip switches differs in the capacity. For the detail, refer to fig.
+ 1.
TERMINAL
BLOCK
THERMISTOR
ADDRESS BOARD
PIPE TEMP. DETECTION/GAS
(0/15k, 25/5.4k)
TH23
P20
P25
P32
P40
MODELS SW2
<fig. + 1>
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
1 2
PFFY-P20VKM-E PFFY-P20VKM-ER1
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1

14
9 REFRIGERANT SYSTEM DIAGRAM
Strainer (#50mesh)
Strainer (#100mesh)
Strainer1 (#50mesh)
Strainer2 (#50mesh)
Heat exchanger
Thermistor (Room temperature detection) TH21
Thermistor (Pipe temperature detection/Gas) TH23
Thermistor (Pipe temperature
detection/Liquid) TH22
Linear expansion valve
Gas pipe
Liquid pipe
Flare connection
Gas pipe
Liquid pipe
PFFY-P20,P25,P32,P40VKM-E(R1)
:12.7(1/2'')
:6.35(1/4'')
Item
Capacity
Unit: mm
PFFY-P20VKM-E PFFY-P20VKM-ER1
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1

15
10 TROUBLE SHOOTING
10-1. HOW TO CHECK
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.
(Surrounding temperature 20)
Linear expansion
valve (LEV)
(Refer to the next page for a detail.)
Room temperature
thermistor (TH21)
Liquid pipe temperature
thermistor (TH22)
Gas pipe temperature
thermistor (TH23)
Normal
4.3k~9.6k
Abnormal
Open or short
Abnormal
Open or short
Normal
200$10%
(1)-(5)
White-Red
(2)-(6)
Yellow-Brown
(3)-(5)
Orange-Red
(4)-(6)
Blue-Brown
Orange
Red
White
Blue
Brown
Yellow





M
Check 10-2.
Fan motor (MF1,2)
Measure the resistance between the terminals using a tester.
(Surrounding temperature 20~30)
Damper motor (MV2)
NormalConnector Abnormal
186~214Open or short
Brown — Yellow
Brown — Blue
Red — Orange
Red — Pink
(Refer to the next
page for a detail.)
BlueYellow Brown
Orange
Red
Pink 




M
Measure the resistance between the terminals using a tester.
(Surrounding temperature 20~30)
Vane motor (MV1)
NormalConnector Abnormal
282~306Open or short
Yellow
Brown
Red
Brown — Red
Brown — Orange
Brown — Yellow
Brown — Blue
Orange Green
M
PFFY-P20VKM-E PFFY-P32VKM-E PFFY-P25VKM-E PFFY-P40VKM-E
PFFY-P20VKM-ER1 PFFY-P32VKM-ER1 PFFY-P25VKM-ER1 PFFY-P40VKM-ER1

16
0
10
20
30
40
50
-20-100 1020304050
< 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'
25:5.2k'
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.
1
273+t
1
273
<Connection between the indoor controller board and the linear expansion valve>

17
Output
(Phase)
Output
{1
1
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
D
A
E
B
C
Open
Extra tightning (80~100pulse)
Pulse number
Outdoor unit
R410A model: 1400 pulse
R22 model : 2000 pulse
Opening a valve
all the way
Close
Valve position (capacity)
3Trouble shooting
6
5
4
3
2
1
LED1
Symptom Check points
Operation circuit
failure of the
micro processor.
Disconnect the connector on the controller board,
then connect LED for checking.
Pulse signal will be sent out for 10 seconds as soon as
the main switch is turned on. If there is LED with lights
on or lights off, it means the operation circuit is abnormal.
Countermeasures
Exchange the indoor
controller board at drive
circuit failure.
Linear expansion
valve mechanism
is locked.
Valve does not
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
are some 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 making any trouble.
Liquid pipe
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 connector.
Exchange the linear
expansion vale.
Exchange the linear
expansion valve.
If large amount of
refrigerant is leaked,
exchange the linear
expansion valve.
Disconnect the con-
nector 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 expan-
sion valve.
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 locks 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 driv-
er handle while putting the screw driver to the linear expansion
valve.

18
10-2. FAN MOTOR
Notes
· High voltage is applied to the connecter (CNMF1) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNMF1,2) for the motor with the power supply on.
(It causes trouble of the control P.C.board)
Self check
Conditions : The indoor fan cannot turn around.
N0
Wiring contact check
Contact of fan motor connector (CNMF1,2)
Power supply check
Check the voltage in the indoor control P.C.board
TEST POINT
FAN MOTOR (upper)
CNMF1  CNMF2 : DC310 ~ 340V
CNMF2  : DC15V
CNMF2  : DC0 ~ 6.5V
FAN MOTOR (lower)
CNMF1  CNMF2 : DC310 ~ 340V
CNMF2  : DC15V
CNMF2  : DC0 ~ 6.5V
The voltage between CNMF2  and  are values during the
fan motor operation. In the case that the fan motor off, the voltage is 0V.
Check method of indoor fan motor (fan motor/control P.C.board)
Wiring recovery
Was contact caused good?
Yes


NG
Replace the indoor
controller board.
Replace the fan motor.
Is the voltage normal?
Yes
No
Check the operation END
OK
Does the voltage repeat
DC 0V and DC 15V?
No
Yes
Fan motor position sensor signal check
Turn around the fan motor more than one revolution slowly,
and check the voltage between the connecter
FAN MOTOR (upper)
CNMF2 /FAN MOTOR (lower) CNMF2 
NG
Replace the indoor controller board.
Replace the fan motor.
Check the operation of fan. END
Yes OK
Indoor controller board fuse check
Is the fuse normal? Replace
the fuse.
Check the operation END
OK
Replace the indoor
controller board.
Check the operation END
OK
NG
Replace the fan motor.
Yes
No
NG

19
Switch Function Remarks
Effective
timing
Under
suspension
Under
suspension
Before
power
supply
ON
Before
power
supply
ON
<Initial setting>
ON
OFF
1234567 8 9 10
Address board
Operation by switch
ON OFF
Note :
+1 Fan operation at Heating
mode.
+2 Thermo ON operation at
heating mode.
+3 SW 1-7=OFF, SW 1-8=ON
→Setting air flow.
SW 1-7=ON, SW 1-8=ON
→Indoor fan stop.
Pole
Built-in remote controller
Provided
2,500hr
Effective
Always operated while the heat in ON +1
Low +3
Setting air flow +3
Effective
Effective
Filter clogging detection
Filter cleaning
Fresh air intake
Humidifier control
Air flow set in case of
Heat thermostat OFF
Auto restart function
Power ON/OFF by breaker
Indoor unit
Not provided
100hr
Not effective
Operated depends on the condition +2
Extra low +3
Depends on SW1-7
Not effective
Not effective
Cooling only
Not effective
Available
Available
Second setting +7
Horizontal angle
Effective
Not effective
—
—
Heat pump/Cooling only
Limitation at time of damper
open operation +4
Vane
Vane swing function
Vane horizontal angle
Vane cooling limit angle setting +5
Heat 4degrees up
Superheat setting temperature +6
Sub cool setting temperature +6
Heat pump
Effective
Not available
Not available
First setting
Down B, C
Not effective
Effective
—
—
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
SW2
Capacity
code
setting
1~6
1~5
SW3
Function
setting
Thermistor <Room temperature
detection> position
<Initial setting>
ON
OFF
1234567 8 9 10
Indoor controller board
Note :
+4 Refer to "6. AIR OUTLET
SELECTION"
+5 At cooling mode, each angle
can be used only 1 hour.
+6 Please do not use
SW3-9,10.
+7 Second setting is the same
as first setting.
Indoor controller board
<Initial setting>
Set while the unit is off.
Set while the unit is off.
Set for each capacity.
Indoor controller board
ON
OFF
12345
SW1
Function
setting
SW4
Model
Selection
(Setting
for
PFFY
series)
Changing the opening of linear
expansion valve during thermo OFF
Switching remote
controller display Indicating if the thermostat is ON Indicating fan operation ON/OFF
In case replacing the indoor controller board, make sure to set the switch to the
factory-preset status, which is shown below.
Capacity
P20 P32
P25 P40
SW 2 Capacity SW 2
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
123456
10-3. FUNCTION OF DIP SWITCH

20
0
5
9
4
8
3
7
2
6
1
0
5
9
4
8
3
7
2
6
1
0
5
9
4
8
3
7
2
6
1
0
5
9
4
8
3
7
2
6
1
0
8
F
7
E
6
D
5
C
4
B
3
A
2
9
1
0
8
F
7
E
6
D
5
C
4
B
3
A
2
9
1
Switch
SWC
Air
outlet
selector
Rotary switchRotary switch
SW14
Branch
No.
setting
SW11
1s digit
address
setting
SW12
10ths digit
address
setting
Pole
(Option)
(Standard) Option
Standard
2
Operation by switch
Refer to 6. AIR OUTLET SELECTION.
Remarks
<Initial setting>
Address board
Address can be set while the
unit is stopped.
Address board
<Initial setting>
Address board
SW12
10
SW11
1
SW12 SW11
SW14
SW14
<Initial setting>
Effective
timing
Before
power
supply
ON
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".
Connector
SWE
No function
Setting by connector Remarks
Indoor controller board
ON OFF
Please do not change the setting to SWE.