Mitsubishi Electric PKFY Series Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION ··························2
2. PART NAMES AND FUNCTIONS···········6
3. SPECIFICATIONS ···································8
4. OUTLINES AND DIMENSIONS ············10
5. WIRING DIAGRAM································ 11
6. REFRIGERANT SYSTEM DIAGRAM···12
7. TROUBLESHOOTING···························13
8. DISASSEMBLY PROCEDURE·············· 20
9. RoHS PARTS LIST································ 23
<Indoor unit>
[Model names] [Service Ref.]
PKFY-P32VGM-E PKFY-P32VGM-E
PKFY-P40VGM-E PKFY-P40VGM-E
PKFY-P50VGM-E PKFY-P50VGM-E
No. OC310
REVISED EDITION-B
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:
• The indicated No. of CORNER
COVER (page 23) have
been corrected in REVISED
EDITION-B.
• Some descriptions have
been modified.
• Please void OC310
REVISED EDITION-A.
March 2013

2
1SAFETY PRECAUTION
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 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.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Store the piping indoors, and both ends of the
piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that
can cause deterioration of refrigerant oil or malfunction of
compressor.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
OC310B

33
[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 iquid refrigerant.
Gravimeter
Unit
[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.
—
OC310B

4
Cautions for units utilizing refrigerant R410A
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
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.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Store the piping indoors, and both ends of the
piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that
can cause deterioration of refrigerant oil or malfunction of
compressor.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
OC310B

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
OC310B

6
2PART NAMES AND FUNCTIONS
●Indoor Unit
PKFY-P32VGM-E
PKFY-P40VGM-E
PKFY-P50VGM-E Air intake Air intake grille
Filter
Air outlet
Guide vane
Auto vane
●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
cover
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
OC310B

77
●Display
°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
For purposes of this explanation,
all parts of the display are shown.
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
Displays 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.
Displays 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.
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 indication
(For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.
OC310B

8
3SPECIFICATIONS
3-1. SPECIFICATION
Item
V•Hz
kW
kW
kW
kW
A
A
—
mm
mm
mm
—
—
m²/min
Pa
kW
—
—
mm(in.)
mm(in.)
mm
dB
kg
Cooling capacity
Power
Heat exchanger
Insulator
Air filter
Fan 5 No
Air flow *2
Pipe
dimensions
Unit drain pipe size
Noise level *2
Product weight
Exterior
(munsell symbol)
Fan motor
output
External
static pressure
Liquid
side
Gas
side
Heating capacity
F
a
n
Dimensions
Height
Width
Depth
Electric characteristic
Input
Cooling
Heating
Cooling
Heating
Current
PKFY-P32VGM-E PKFY-P40VGM-E PKFY-P50VGM-E
Single phase 220V-230V-240V · 50Hz / 220V · 60Hz
3.6
4.0
4.5
5.0
0.07
0.07
0.32
0.32
Plastic , white : <0.70Y 8.59/0.97>
340
990
235
Cross fin (Aluminum plate fin and copper tube)
Linflow fan × 1
0
0.03
Polyethylene sheet
PP honey comb
O.D.20 (PVC pipe VP-20 connectable)
16
5.6
6.3
12-11-10-9
12.7(1/2") / 15.88(5/8")
6.35(1/4") / 9.52(3/8")
43-40-37-34
11.5-10.5-9.5-8
12.7(1/2")
6.35(1/4")
41-38-36-33
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
*2.Air flow and the noise level are indicated as High – Medium1 – Medium2 – Low .
OC310B

99
3-2. ELECTRICAL PARTS SPECIFICATIONS
Room temperature thermistor
Liquid pipe temperature thermistor
Gas pipe temperature thermistor
Fuse
(Indoor controller board)
Fan motor
(with inner-thermostat)
Fan motor capacitor
Vane motor
Linear expansion valve
Power supply terminal block
Transmission terminal block
MA remote controller terminal block
Symbol
TH21
TH22
TH23
FUSE
MF
C1
MV
LEV
TB2
TB5
TB15
PKFY-P32VGM-E PKFY-P40VGM-E
Resistance 0ºC/15kΩ, 10ºC/9.6kΩ, 20ºC/6.3kΩ, 25ºC/5.4kΩ, 30ºC/4.3kΩ, 40ºC/3.0kΩ
Resistance 0ºC/15kΩ, 10ºC/9.6kΩ, 20ºC/6.3kΩ, 25ºC/5.4kΩ, 30ºC/4.3kΩ, 40ºC/3.0kΩ
Resistance 0ºC/15kΩ, 10ºC/9.6kΩ, 20ºC/6.3kΩ, 25ºC/5.4kΩ, 30ºC/4.3kΩ, 40ºC/3.0kΩ
250V 6.3A
PM4V30-K 220-240V/220V , 50/60Hz
4 pole Output 30W
OFF 125±5
ºC
2.0μF 440V
MP 35 EA DC12V
DC12V Stepping motor drive
Port dimension 3.2 (0 ~ 2000pulse)
(L, N, ) 330V 30A
(M1, M2, S) 250V 20A
(1,2) 250V 10A
Model
Parts name PKFY-P50VGM-E
Inner-thermostat
OC310B

10
4 OUTLINES AND DIMENSIONS
Unit : mm
PKFY-P32VGM-E
PKFY-P40VGM-E
PKFY-P50VGM-E
Knockout hole for right piping Refrigerant pipe.Drain pipe. Wiring hole
Gas pipe
Liquid pipe
Address board
Filter grip
21
21
Knockout hole for under piping Refrigerant piping.Drain pipe. Wiring hole
Service panel (Power supply access)
1/2F / 5/8F
Gas pipe
1/2F
Liquid pipe
1/4F / 3/8F 1/4F
50 32 , 40 Model
( Flexible hose total length 800 ) ( Right side piping
installation )
( Left side piping installation )
Drain pipe (VP-20)
(Front view( to open the grille ))
12 - Louvers ( manual )
Air outlet
(Lower side)
Auto vane
(Left side) (Front view)
Air intake
Air intake
Air intake
Air intake
Knockout hole for left piping Refrigerant pipe.Drain pipe.Wiring hole.
(Right side)
35
700 153
449 86
581 54
31
280
80
60
70
245
50
395400
190
60
70 35
160 40
705 235
Less than 15
198
70
245
60
235
53
340
715 225
340 80 280 233
990
79
Installation plate balance point hole
49 - 5 hole for tapping screw
Knockout hole for right-rear piping Right-rear
piping hole
( Necessary clearance for Unit installation )
R52.5
R52.5
R52.5 R52.5
Unit center
Right side
Allowing clearances Front view
*1 Sleeves are available on the market. *2 For R22 or R407C. *3 This size shows the lower end of through hole.
90 ~ 100 75 ~ 80
90 75 Through holeSleeve *1
50 *2 32 , 40 , 50 Model
Details of installation plate
14 - 14 hole for bolts
Left-rear piping hole
Knockout hole for left-rear piping
Less than 130
50 or more 150 or more
180 or more
30 or more
425
420
170
190
210
230
0
322 0 35 55 80 130 190 230 272 310 0
35
95
150
205
260
320
345
495
20
75
135
190
245
300
360
405
495
32
0
*3
OC310B

11
WIRING DIAGRAM
5
PKFY-P32VGM-E PKFY-P40VGM-E PKFY-P50VGM-E
0
Mode selection
A.B
SW12
SW11
SW1
SW14
SW5
SWC Option selector
Connection No.
Address setting 2nd digit
Address setting 1st digit
Voltage selection
Switch
Circuit board
(WHT)
DRAIN
CN31
54321
OFF
ON 54321
OFF
ON SW4
ON
OFF 12345
on →lamp is lit
Main power supply(Indoor unit:220-240V)
power on →lamp is lit
LED on indoor board for service
Power supply for
MA-Remote controller
Function
Main power supply
Meaning
LED2
LED1
Mark
240V220V SW5
1
~ 220V 60Hz
POWER SUPPLY
~ 220-240V 50Hz
FUSE(15A)
BREAKER
(15A)
PULL BOX
TO NEXT INDOOR UNIT
<fig: *1>
CONTROLLER
TO MA-REMOTE
54321
OFF
ON
678910
P40 654321
OFF
ON
Models
P32 654321
OFF
ON SW2
54321
OFF
ON
678910
SW3
P50 ON
OFF 123456 54321
OFF
ON
678910
TH21
54321
12345678910
6
LEV
4
123456
8
ON
OFF12345678910
SW1
SW12 SW11
A.B
00
MV
P.B
TRANS CN2S
DC13.1V
(WHT)(RED)
AC220-240V
CNSK
X4
41
3
5151
X4
0N
SW4
0N SW3SW2
FAN
F.C
CND
FUSE
250V
6.3A
ZNR
CN6V CN42
CN81 0FF 0FF
I.B C1
TB15 1
2
{
(WHT)
DC8.7-13V
(RED)
BLK WHT RED
BLU RED
BLK WHT
ORN YLW
BLU
PIN
RED BRN
VANE
(GRN) ADDRESS
(RED) (RED)
ADDRESS
CN52
(GRN)
REMOTE
INDICATION
CN51
CENTRALLY
CONTROL
(WHT)
See fig: *1
BLU RED BRN
YLW
WHT
ORN
(WHT)
REMOTE
SWITCH
CN32
(WHT)
HA
CN41
(BLK)
GAS
CN29
(RED)
CN20
INTAKE
(WHT)
LIQUID
CN21
TH23TH22
(WHT)
LEV
CN60
CN2M
CNDK
(RED) LED1
LED2
(BLU)
CN3A
CN2D
(WHT)
(BLU)
(M-NET)
BLK
WHT
BLU
BLU
ORN
ORN
M1
M2
S(SHIELD)
{
REMOTE CONTROLLER
DC24-30V
BC CONTROLLER
TO OUTDOOR UNIT
TB5
3RD
DIGIT 2ND DIGIT 1ST
DIGIT
0
SW14
CONNECTION
NO.
SWC
(RED)
ADDRESS
CN82
(RED)
ADDRESS
CN43
RED
BLU N
TB2 L
GRN/YLW
Power supply for MA-Remote controller
321
Thermistor
TH23
(0ºC/15k , 25ºC/5.4k )
Pipe temperature detection/Gas
Indoor power board
P.B
MA-Remote Controller
TB15
121221
4
3
2
18
7
6
5
4
3
2
1
2
1
3
2
1
13
2
1
3
1
2
31
1
2
123456
513
132
MF
123412345678561234
MV
MF
C1
Vane motor
Terminal
block
TB5
TB2
Fan motor (with inner thermo)
Power supply
Transmission
LEV Linear expansion valve
Capacitor (fan motor)
Pipe temperature detection/Liquid
Room temperature detection
TH22
TH21 Thermistor
1.At servicing for outdoor unit,always follow the wiring diagram of outdoor unit.
2.In the case of using MA-Remote controller, please connect to TB15.
(Remote controller wire is non-polar.)
3.In the case of using M-NET, please connect to TB5.
(Transmisson line is non-polar.)
4.Symbol[S] of TB5 is the shield wire connection.
5.Symbols used in wiring diagram above are, :terminal block, :connecter.
6.The setting of the SW2 dip switches differs in the capacity for the detail,refer to the fig: *1.
7.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.
Note
Legend Symbol Name Symbol Name
NameSymbol
FUSE
F.C Fuse (6.3A) Fan phase control
I.B
ZNR
X4
SW3
SW4
SW2
CN52
CN51
CN41
CN32 Indoor controller board Connector
Aux.Relay (Fan motor)
Varistor
Mode selection
Capacity code
Remote indication
Centrally control
Remote switch
HA terminal-A
Switch
Model selection
(0ºC/15k , 25ºC/5.4k )
(0ºC/15k , 25ºC/5.4k )
The black square (■) indicates a switch position.
OC310B

12
6 REFRIGERANT SYSTEM DIAGRAM
Gas pipe temperatute
thermistor TH23 Strainer (#50mesh)
Strainer (#100mesh)
Strainer (#100mesh)
Heat exchanger Linear expansion valve
Gas pipe
Flare connection
Liquid pipe
Liquid pipe temperature
thermistor TH22
Room temperature thermistor
TH21
PKFY-P32VGM-E
PKFY-P40VGM-E
PKFY-P50VGM-E
Gas pipe
PKFY-P32VGM-E PKFY-P40VGM-E
Liquid pipe
Capacity
Item PKFY-P50VGM-E
12.7 (1/2”)
6.35 (1/4”) 6.35 (1/4”) or 9.52(3/8”)
12.7 (1/2”) or 15.88(5/8”)
OC310B

13
TROUBLE SHOOTING
7
7-1. HOW TO CHECK THE PARTS
PKFY-P32VGM-E PKFY-P40VGM-E PKFY-P50VGM-E
Room temperature
thermistor (TH21)
Liquid pipe temperature
thermistor (TH22)
Gas pipe temperature
thermistor (TH23)
Vane motor
Fan motor
Linear expansion
valve
Disconnect the connector then measure the resistance with a tester.
(Surrounding temperature 10°C~30°C)
Measure the resistance between the terminals with a tester.
(Surrounding temperature 20°C~30°C)
Disconnect the connector then measure the resistance with a tester.
(Surrounding temperature 20°C)
1
3
2
2
3
1
Red
White
Black
Fan
Protector
Orange
Red
White
Blue
Brown
Yello
w
3
6
15
4
2
M
Parts name Check method
Measure the resistance between the terminals with a tester.
(Surrounding temperature 20°C)
M
Blue
Brown
Yellow
Orange
Red
Pink
4
5
2361
Refer to the next page for the details.
Refer to the next
page for the details.
Normal
4.3k ~9.6k Abnormal Open or short
Normal Abnormal
186 ~ 214 Open or short
Red - Pink
Connector
Brown - Yellow
Brown - Blue
Red - Orange
Motor terminal or
relay connector Normal Abnormal
Red - Black 141.2 Open or short
White - Black 131.5
Normal
(1)-(5)
White-Red 150 ±10%
Abnormal
Open or short
(2)-(6)
Yellow-Brown
(3)-(5)
Orange-Red (4)-(6) Blue-Brown
OC310B

14
0
10
20
30
40
50
-20-100 1020304050
< Thermistor for lower temperature >
Temperature (ºC)
Resistance (K )
4
3
6
5
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
4
3
2
1
4
3
2
1
<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( ) }
0ºC 15k
10ºC 9.6k
20ºC 6.3k
25ºC 5.4k
30ºC 4.3k
40ºC 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>
OC310B

15
Output
(Phase)
Output
1
1
ON
2ON
3 OFF
4 OFF
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
Extra tightning (80~100pulse)
Pulse number
2000 pulse
Opening a valve
all the way
Close
Valve position (capacity)
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 con-
nect 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 con-
troller board at drive circuit
failure.
Linear expansion
valve mechanism is
locked.
Valve does not 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 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 con-
nector.
Exchange the linear expan-
sion vale.
Exchange the linear expan-
sion 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 shifts 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 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 driver
handle while putting the screw driver to the linear expansion valve.
OC310B

16
7-2. FUNCTION OF DIPSWITCH
PKFY-P32VGM-E PKFY-P40VGM-E PKFY-P50VGM-E
1
2
3
4
5
6
7
8
9
10
1~6
1
2
3
4
5
6
7
8
9
10
1~5
Thermistor<Intake temperature
detection>position
ON OFF
Filter clogging detection Provided Not provided
Filter cleaning sign 2500hr 100hr
Air intake Effective Not effective
Remote indication switching Thermostat ON signal indication Fan output indication
Humidifier control Always operated while the heating mode *1 Operated depends on the condition *2
Air flow set in case of Fix to LOW *3 Fix to EXTRA LOW *3
Heat thermostat OFF
Depends on setting Remote controller *3 Depends on SW1-7
Auto restart Effective Not effective
Power source ON/OFF Effective Not effective
Heat pump/Cooling only Cooling only models Heat pump models
Louver Available Not available
Vane Available Not available
Vane swing function Available Not available
Vane horizontal angle Second setting First setting
Vane cooling limit angle setting *4 Horizontal angle Down B,C
Effective Not effective
Heater 4deg up Not effective Effective
Target Superheat setting *5 9 degrees 6 degrees
Target Sub cool setting 15 degrees 10 degrees
ON
OFF 12345
ON
OFF 12345678910
ON
OFF 123456
Capacity SW2 Capacity SW2 Capacity SW2
P32 P40
Address board
<Initial setting>
Indoor controller board
Indoor controller board
Indoor controller board
<Initial setting>
SW4
Unit
Selection
SW3
Function
Selection
SW2
Capacity
code
setting
SW1
Mode
Selection
Switch Pole Function
Operation by switch Remarks
Built-in remote controller Indoor unit
Indoor linear expansion
valve opening
NOTE:
*1 At Heating mode, fan
operating.
*2 At Heating mode, operat-
ing heat thermostat ON.
*3 SW1-7=OFF, SW1-8=ON
→Setting air flow.
SW1-7=ON, SW1-8=ON
→Indoor fan stop.
Set while the unit is off.
<Initial setting>
Set for each capacity.
Set while the unit is off.
NOTE:
*4 At cooling mode, each
angle can be used only 1
hour.
*5 SW3-9 setting
P32 = OFF
P40 = ON
P50 = OFF
Set while the unit is off.
ON
OFF 123456
ON
OFF 123456
ON
OFF 12345678910
<Initial setting>
ON
OFF 12345
P50
OC310B

17
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
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 Pole Remarks
<Initial setting>
<Initial setting>
SW11
1st digit
address
setting
SW12
2nd digit
address
setting
Rotary switch
SW14
Connect
ion No.
setting
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.
220V 240V
220V 240V
Address board
<Initial setting>
2
SW5
Voltage
Selection
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.
10 1
OC310B

18
7-3. TEST POINT DIAGRAM
7-3-1. Indoor controller board
PKFY-P32VGM-E
PKFY-P40VGM-E
PKFY-P50VGM-E
The voltage range of DC12V in this
page is between DC11.5 V to DC 13.7 V.
LED1
Main power supply
(Indoor unit : 220-240V)
CND
Power supply for
indoor controller board
Between 1 to 3 220-240V AC
CNP
Drain pump output (DP)
Between 1 to 3 220-240V
AC
CNDK
Connect to the indoor power
board (CNSK)
Between 1 to 3 220-240V AC
FAN
Fan motor output (MF)
CN2D
Connect to the indoor
power board (CN2S)
12.5-13.7V DC (Pin 1 (+))
CN29
Pipe temperature
thermistor/Gas (TH23)
CN21
Pipe temperature
thermistor/Liquid (TH22)
LED2
Power supply for
MA-Remote controller
CN32
Connector
(Remote switch)
SW4
Model selection
CN60
Linear expansion valve
output (LEV)
CN31
Drain sensor (DS)
SW3
Mode selection
SW2
Capacity setting
CN6V
Vane moter output (MV)
CN20
Room temperature
thermistor (TH21)
CN51
Centrally control
1-2: Control signal
12VDC pulse input (1: +)
3-4: Operation indicator
12VDC (3: +)
3-5: Malfunction indicator
12VDC (3: +)
CN52
Remote indicator
1-2
: Status lamp 12VDC (1: +)
Fan motor output
(SW1-5 OFF)
Thermostat ON (SW1-5 ON)
1-3: Cooling/Dry status lamp
12VDC (1: +)
1-4: Heating status lamp
12VDC (1: +)
CN2M
Connect to the terminal block (TB5)
(M-NET transmission connecting wire)
24-30V DC (non-polar)
CN3A
Connect to the terminal block (TB15)
(MA-Remote controller connecting wire)
Between 1 to 3 8.7-13V DC (Pin 1 (+))
FUSE
6.3A 250V
OC310B

19
7-3-2. Indoor power board
PKFY-P32VGM-E
PKFY-P40VGM-E
PKFY-P50VGM-E
CNSK
Connect to the indoor controller board (CNDK)
Between 1 to 3 220-240V AC
CN2S
Connect to the indoor power board (CN2D)
Between 1 to 3 12.6-13.7V DC (Pin 1 (+))
OC310B

20
8DISASSEMBLY PROCEDURE
PKFY-P32VGM-E PKFY-P40VGM-E PKFY-P50VGM-E
OPERATION PROCEDURE PHOTOS & ILLUSTRATION
1. REMOVE THE LOWER SIDE OF THE INDOOR UNIT FROM
THE INSTALLATION PLATE
(1) Remove the left / right corner box of the indoor unit.
(2) Hold and pull down the lower and both ends of the indoor
unit, and remove the ▼section from the square hole.
(Refer to the figure 2.1)
Or remove the front panel and push the ▼section down
by using alankey ,etc. from the front side.
(Refer to the figure 2.2).
(3) Unhook the top of the indoor unit from the back plate catch.
2. REMOVING THE FRONT PANEL
(1) Open the front grille.
(2) Remove the terminal block cover with a screw.
(3) Remove the screw 3 caps then remove the set 3 screws.
(4) After removing the lower side of the front panel a little,
remove it as pulling toward upper.
3. REMOVING THE INDOOR CONTROLLER BOARD
(1) Remove the terminal block cover.
(2) Remove the front panel. (See the photo 1)
(3) Remove the electrical parts box (2 screws).
(4) Remove the electrical parts box cover (1 screw).
(5) Disconnect the connector on the indoor controller board and
remove the controller board by Pulling up the hook of the
controller case.
* To work smoothly, hang the side hooks of the electrical
parts box on the hook of the motor cover.
(See the photo 3)
(Figure 1)
(Figure 2.1)
(Figure 3)
(Photo 1)
(Photo 2)
(Figure 2.2)
Square hole Up Down
Hook
Square hole
Hook
Terminal block cover
Front grille
Front
panel
Set screw
Set screw
Electrical parts
box
Set screw
Motor cover
Electrical parts
box hook *
(Photo 3)
Hook
Electrical parts box
Controller case
Indoor control
P.C. board
OC310B