Mitsubishi Electric PKFY-P12NHMU-E Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS..........2
2. SPECIFICATION.....................................4
3. OUTLINES AND DIMENSIONS..............6
4. WIRING DIAGRAM.................................7
5. REFRIGERANT SYSTEM DIAGRAM..........8
6. MICROPROCESSOR CONTROL...........9
7. TROUBLESHOOTING..........................14
8. DISASSEMBLY PROCEDURE.............21
Indoor unit
[Model names] [Service Ref.]
PKFY-P12NHMU-E PKFY-P12NHMU-E
PKFY-P15NHMU-E PKFY-P15NHMU-E
PKFY-P18NHMU-E PKFY-P18NHMU-E
No. OCH460
INDOOR UNIT
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R22R410A
Note:
•This manual describes
only service data of the
indoor units.
•RoHS compliant products
have <G> mark on the
spec name plate.
April 2009
PARTS CATALOG (OCB460)

2
1PART NAMES AND FUNCTIONS
Indoor unit
Filter Air intake
Louver Air outlet Vane
Wireless remote controller
ON/OFF TEMP
FAN
VANE
TEST RUN
AUTO STOP
AUTO START
h
min
LOUVER
MODE
CHECK
RESETSET CLOCK
MODEL SELECT
NOT AVAILABLE
CHECK TEST RUN
°C
AMPM
AMPM
°F
VANE CONTROL button
Used to change the air flow
CLOCK button
RESET button
SET button
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
LOUVER button
Changes left/right airflow direction.
(Not available for this model.)
MODE SELECT button
Used to switch the operation mode between
cooling, drying, fan, heating and auto mode.
CHECK-TEST RUN button
Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.
FAN SPEED SELECT button
Used to change the fan speed.
TIMER display
Displays when in timer operation or when
setting timer.
button
SET TEMPERATURE button sets any desired
room temperature.
CLOCK display
Displays the current time.
“ ” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
+In case the outdoor unit is cool only type,
the heating and auto mode are not
available.
Buttons used to set the “hour and minute” of
the current time and timer settings.
h and min buttons
display
display
FAN SPEED display indicates which fan
speed has been selected.
display
The vertical direction of air flow is indicated.
display
Blinks when model is selected.
display
display
CHECK and TEST RUN display indicate that
the unit is being checked or test-run.
display
OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.
TIMER CONTROL buttons
AUTO STOP (OFF timer): when this switch is
set, the air conditioner will be automatically
stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.
MODEL SELECT
CHECK TEST RUN
SET TEMP. display indicates the set desired
temperature.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.

33
Wired remote controller
°F°C
°F°C
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF


Display Section
For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.
Identifies the current operation
Shows the operating mode, etc.
*Multilanguage display is available.
“Centrally Controlled” indicator
Indicates that operation from the
remote controller has been prohib-
ited by a master controller.
“Timer is Off” indicator
Indicates that the timer is off.
Temperature Setting
Shows the target temperature.
Day-of-Week
Shows the current day of the week.
Time/Timer Display
Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, the time to be
switched off is shown.
“Sensor” indication
Displayed when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller but-
tons have been locked.
“Clean The Filter” indicator
To be displayed on when it is time to
clean the filter.
Timer indicators
The indicator comes on if the corre-
sponding timer is set.
Up/Down Air Direction indica-
tor
The indicator shows the direc-
tion of the outcoming airflow.
“One Hour Only” indicator
Room Temperature display
Shows the room temperature. The room
temperature display range is 46–102°F.
The display blinks if the temperature
is less than 46°F or 102°F or more.
Louver display
Indicates the action of the swing louver.
Does not appear if the louver is not
running.
(Power On indicator)
Indicates that the power is on.
Fan Speed indicator
Shows the selected fan speed.
Ventilation indicator
Appears when the unit is running in
Ventilation mode.
Operation Section
Temperature setting buttons
Down
Up
Timer Menu button
(Monitor/Set button)
Mode button (Return button)
Set Time buttons
Back
Ahead
Timer On/Off button
(Set Day button)
Opening the
lid
ON/OFF button
Fan Speed button
Filter button
(<Enter> button)
Test Run button
Check button (Clear button)
Airflow Up/Down button
Louver button
( Operation button)
To return operation
number
Ventilation button
( Operation button)
To go to next operation
number
Note:
“PLEASE WAIT” message
This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.
“NOT AVAILABLE” message
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.
Built-in temperature sensor
Displayed if the airflow is set to
Low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
at which time the airflow direction
also changes.

4
4.4
15,000
0.03
0.30
5.0
17,000
0.03
0.30
Note : Unit converter
kcal/h = kW × 860
Btu/h = kW × 3,412
cfm = m3/min × 35.31
lb = kg/0.4536
*Above specification data is
subject to rounding variation.
Service Ref.
Power source
Cooling capacity
(Nominal)
Heating capacity
(Nominal )
External finish
External dimension H × W × D
Net weight
Heat exchanger
Fan
Noise level (Low-Mid-High)
(measured in anechoic room)
Insulation material
Air filter
Protection device
Refrigerant control device
Connectable outdoor unit
Diameter of
refrigerant pipe
Field drain pipe size
Standard
attachment
Optional parts
Remarks
Power input
Current input
Power input
Current input
Type × Quantity
External
static press.
Motor type
Motor output
Driving mechanism
Airflow rate
(Low-Mid-High)
Liquid
Gas
Document
Accessory
External heater adapter
Installation
kW
Btu/h
kW
A
kW
Btu/h
kW
A
mm
in.
kg (lb)
Pa
mmH2O
kW
m3/min
L/s
cfm
dB <A>
mm (in.)
mm (in.)
mm (in.)
*1
*1
*2
*2
(R410A)
(R22)
(R410A)
(R22)
Installation Manual, Instruction Book
PAC-YU25HT
1-phase 208-230V 60Hz
Cross fin (Aluminum fin and copper tube)
DC motor
Direct-drive
Polyethylene sheet
PP honeycomb
Fuse
LEV
R410A, R22 CITY MULTI
PKFY-P12NHMU-E
Plastic, MUNSELL (1.0Y 9.2/0.2)
3.5
12,000
0.03
0.30
4.0
13,500
0.03
0.30
295 × 898 × 249
11-5/8" × 35-3/8" × 9-13/16"
13 (29)
Line flow fan × 1
0
0
0.030
PKFY-P15NHMU-E
9 - 10.5 - 12
150 - 175 - 200
320 - 370 - 425
36 - 41 - 45
I.D. 16mm (5/8")
ø6.35 (ø1/4")
ø6.35 (ø1/4")
ø12.7 (ø1/2")
ø12.7 (ø1/2")
Flare
Flare
Flare
Flare
ø6.35 (ø1/4")
ø6.35 (ø1/4")
ø12.7 (ø1/2")
ø12.7 (ø1/2")
Flare
Flare
Flare
Flare
PKFY-P18NHMU-E
5.3
18,000
0.03
0.30
5.9
20,000
0.03
0.30
9 - 10 - 11
150 - 167 - 183
320 - 355 - 390
34 - 38 - 42
ø6.35 (ø1/4")
ø9.52 (ø3/8")
ø12.7 (ø1/2")
ø15.88 (ø5/8")
Flare
Flare
Flare
Flare
—
——
9 - 10.5 - 11.5
150 - 175 - 192
320 - 370 - 405
34 - 38 - 42
*3
*1 Nominal cooling conditions
Indoor :
Outdoor :
Pipe length :
Level difference :
80°FDB/67°FWB (26.7°CDB/19.4°CWB)
95°FDB (35°CDB)
25 ft. (7.6 m)
0 ft (0 m)
*2 Nominal heating conditions
70°FDB(21°CDB)
47°FDB/43°FWB (8.3°CDB/6.1°CWB)
25 ft. (7.6 m)
0 ft (0 m)
*3 Connect the joint
(purchased locally) for R22
* Due to continuing improvement, above specification may be subject to change without notice.
*3
Details on foundation work, insulation work, electrical wiring, power source switch, and other items shall be referred to
the Installation Manual.
2SPECIFICATION
2-1. Specifications

55
Parts name
Service Ref.
Symbol
TH21
TH22
TH23
TH24
FUSE
MF
MV
LEV
TB2
TB5
TB15
Resistance 30°F/15.8k, 50°F/9.6k, 70°F/6.0k, 80°F/4.8k, 90°F/3.9k, 100°F/3.2k
Resistance 30°F/15.8k, 50°F/9.6k, 70°F/6.0k, 80°F/4.8k, 90°F/3.9k, 100°F/3.2k
Resistance 30°F/15.8k, 50°F/9.6k, 70°F/6.0k, 80°F/4.8k, 90°F/3.9k, 100°F/3.2k
250V 3.15A
8-Pole Output 30W / RCOJ30-CK
MSFBC20 DC12V
(L1, L2, GR) 250V 20A
(M1, M2, S) 250V 20A
(1, 2) 250V 10A
Liquid pipe thermistor
Gas pipe thermistor
Linear expansion valve
PKFY-P12NHMU-E PKFY-P15NHMU-E
Room temperature
thermistor
Fuse
(Indoor controller board)
Fan motor
Vane motor
(with limit switch)
Power supply terminal
block
Transmission terminal
block
DC12V Stepping motor drive
Port :3.2 (0~2000pulse)
PKFY-P18NHMU-E
MA remote controller
terminal block
PKFY-P12, 15NHMU-E
External static pressure : 0Pa
Power source : 208,230V, 60Hz
* Measured in anechoic room.
OCTAVE BAND PRESSURE LEVEL (dB) 0dB = 20MPa
3.3 ft. (1m)
Measurement location
PKFY-P12NHMU-E
PKFY-P15NHMU-E
PKFY-P18NHMU-E
34-38-42
36-41-45
Sound level dB (A)
Sound level at anechoic room : Low-Middle-High
Service Ref.
34-38-42
Approximate minimum
audible limit on
continuous noise
High speed
Low speed
3.3 ft.
(1m)
OCTAVE BAND CENTER FREQUENCIES(Hz)
PKFY-P18NHMU-E
External static pressure : 0Pa
Power source : 208,230V, 60Hz
OCTAVE BAND PRESSURE LEVEL (dB) 0dB = 20MPa
OCTAVE BAND CENTER FREQUENCIES(Hz)
Approximate minimum
audible limit on
continuous noise
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC60
NC50
NC40
NC30
NC20
High speed
Low speed
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC60
NC50
NC40
NC30
NC20
2-2. Electrical parts specifications
2-3. Sound levels
2-4. NC curves

6
OUTLINES AND DIMENSIONS
3
1/2F ( : 12.7)
1/4F ( : 6.35)
Refrig-
erart
Piping
Drain hose
Gas pipe
Liquid pipe
:2-1/2~:3-1/8
(:65~:80)
:2-1/2~:3-1/8
(:65~:80)
Through hole
Sleeve
(purchased locally)
Center measurement hole :3/32( : 2.5)
5/32(3.8)
2-1/4(58)
0
Wall hole
for
left rear
piping
Knockout hole for
rear piping
2-3/4×12-3/16(70×310)
Wall hole for
right rear piping
77-
: 3/16( : 5.1)
Tapping
screw hole
4- : 5/16( : 9) Bolt hole Mount board
Indoor unit outline
0
5/8(16)
9-15/16(253.5)
9-1/8(232.5)
1-1/16(28.5)
1-9/16(41)
3-1/16(78.5)
4-1/16(103.5)
4-9/16(116)
6-1/2(166)
7(178.5)
8(203.5)
3-9/16(91)
13/16(21.8)
9-1/16(231.5)
10-3/4(273.2)
0
1-1/4(32.7)
2-9/16(66)
2-1/16(53.5)
5(128.5)
6(153.5)
3/4(20)
9/16(15)
14-5/8(372.3) 14(356.3) 12-7/8(237.5) 11-7/16(291.5) 10-3/8(265) 9-5/16(238) 8-13/16(225) 7-13/16(200)
4-7/8(125)
2-3/4(70)
9/16(15)
14-5/8(372.3) 14(356.3) 12-7/8(327.5) 10-3/8(265) 11-7/16(291.5) 7-13/16(200) 8-13/16(225) 4-7/8(125) 2-3/4(70) 0
17-5/8(449)
7-9/16(193.5)
7-1/16(180.3)
6-9/16(167)
5-1/2(140)
4-1/2(115)
6-13/16(174)
8-3/8(213)
9-5/16(238)
10-15/16(278.3)
15-1/2(394)
11-1/16(281)
17-5/8(449)
0
Emergency operation switch
(cooling/heating)
Terminal block for
MA-remote controller
Terminal block for transmission
Front side(Grille open)
Terminal block for power supply
17-15/16(457)Gas pipe
21-3/16(539)Liquid pipe
6-5/8(169)
6-3/16(158)
24(610)Drain hose 7-3/16(184)
Required space(Indoor unit)
Air inlet
Air inlet
Air outlet
Min.1-31/32(50)
Min.9-13/16(250)
Min.5-7/8(150)
Min.8-5/8
(220)
Min.1-31/32(50)
Min.1/4(7)
Knockout hole for piping
D
2-3/16(56)
2-11/16(69)
3/16(6)
1-11/16(43)
C
2-3/16(56)7/16(12.5)
1-11/16(43)
B
1-3/4(46)
2-5/16(60)
2-5/16(59)
1-11/16(43)
A
1-11/16(43)
1-3/4(46)
2-3/16(56)
3/16(6)
A
Knockout hole
for right piping
Right side
Mount board
3/16(5)9-13/16(249)
Top side
15-3/16(387) 7-1/2(192)
7-3/4(197)
23-9/16(599)
CB
Operation lamp DEFROST/STAND BY lamp
Receiver
Louver(manual)
Vane(auto)
Knockout hole
for lower piping
Knockout hole
for lower piping
Under side
5/16(8)
24-1/16(612)
D
Knockout hole
for left piping
Left side
Front side
6-1/16(155)
2-1/8
(55)
27-1/16(688)
11-5/8(295)
35-3/8(898)
: 5/8 ( : 16) I.D
PKFY-P12, 15, 18NHMU-E Unit : inch (mm)

7
WIRING DIAGRAM4
<fig:  1>
Models SW2
P12
P15
P18
123456
ON
OFF
FAN
CNMF
(WHT)
163
MS
3
~
M
VANE
CN151
(WHT)
51 LEV
CN60
(YLW)
6
6
1
CNRU
(WHT)
LDSWE ( A )
(
BLU )
61
3
3
151
51
41
41
21
21
31
41
81
13
51
13
12
12345678
SW3
123456
SW2
ON
OFF
ON
OFF
1234
SW4
21
11 2
2
3
3
45678910
SW1
SWA
L1
L2
LED1
X1
LED2
M
DC311 ~ 339V
RECTIFICATION
FUSE
CNP
( BLU )
CND
(BLK)
RED BLU YLW
MOV1
BLK WHT
MF MV LEV
DSA
MOV2
SWE
OFF
BZ
ON
BLU
TB2
RED
RED
BLU
BLU
YLW
WHT
ORN ORN
ORN
ORN
YLW
BLU
BRN
BRN
RED
GRN/YLW
RED
BLU
BLK
U
U
I.B S.B
W.B
A.B
PULL
BOX
FUSE
( 16A )
BREAKER
( 16A )
TO NEXT
INDOOR
UNIT
POWER SUPPLY
208/230V 60Hz
GRN
CN52
(GRN)
LD SWE(B)
LD101(B)
SWE1
LED1
TH24
TH23
TH22
TH21
LED2
SWE2
CN51
(WHT)
CN24
(YLW)
FLOAT SW
CN4F
(WHT)
LIQUID/GAS1
CN44
(WHT)
INTAKE
CN20
(RED)
ADDRESS
CN81
(RED)
ADDRESS
CN42
(RED)
GAS2
CN2G
(BLK)
ADDRESS
CN43
(RED)
ADDRESS
CN82
(RED)
MA-REMOCON
CN3A
(BLU)
M-NET
CN2M(BLU)
CN32
(WHT)
RU
4
8
t
t
t
t
See fig:  1
TB5
(SHIELD)
M1
M2
TB15
1
S
2
TO MA- REMOTE
CONTROLLER
DC8.7-13V
TO OUTDOOR UNIT
BC CONTROLLER
REMOTE CONTROLLER
DC24-30V
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
SW14SW11SW12
10ths
DIGIT
1s
DIGIT
BRANCH
No.
A.B ADDRESS BOARD
S.B SWITCH BOARD
W.B PCB FOR WIRELESS REMOTE CONTROLLER
SW1
SWA
SW11
SW12
MODE SELECTION
FAN SPEED SELECTOR
ADDRESS SETTING 1s DIGIT
SWE1
SWE2
EMERGENCY OPERATION(HEAT)
EMERGENCY OPERATION(COOL)
LED(OPERATION INDICATOR:GREEN)
LED(OPERATION FOR HEATING :ORANGE )
RECEIVING UNIT
ADDRESS SETTING 10ths DIGIT
SW14 BRANCH No.
SWITCH
LED1
LED2
RU
SYMBOL NAME
TH21
THERMISTOR ROOM TEMP. DETECTION
(32°F/15k,77°F/5.4k)
PIPE TEMP. DETECTION / LIQUID
(
32°F/15k,77°F /5.4k)
PIPE TEMP. DETECTION / GAS1
(
32°F/15k,77°F /5.4k)
TH22
TH23
PIPE TEMP. DETECTION / GAS2
(
32°F/15k,77°F /5.4k)
TH24
NOTES:
1.At servicing for outdoor unit,always follow the wiring diagram of outdoor unit.
2.In case of using MA-Remote controller, please connect to TB15.
(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, :connecter.
6.The setting of the SW2 dip switches differs in the capacity. for the detail, refer to the fig:1.
Mark Meaning Function
Power supply for
MA-Remote controller
Main power supply (Indoor unit:208-230V)
Power on Iamp is lit
LED on indoor board for service
LED1 Main power supply
Power supply for MA-Remote controller
on Iamp is lit
LED2
123456
ON
OFF
123456
ON
OFF
<+2>
GR
<+2>Use copper supply wires.
SYMBOL NAME
I.B INDOOR CONTROLLER BOARD
BZ
CN32
CN51
CN52
CONNECTOR
BUZZER
DSA SURGE ABSORBER
REMOTE SWITCH
CENTRALLY CONTROL
REMOTE INDICATION
X1 AUX.RELAY
FUSE FUSE (T3.15AL 250V)
LED1 POWER SUPPLY (I.B)
LED2 POWER SUPPLY (I.B)
MF
MV
LEV LINEAR EXPANSION VALVE
FAN MOTOR
VANE MOTOR
MOV 01.02 VARISTOR
DRAIN PUMP (
OPTION )
TB2
TB5
TB15
TRANSMISSION
MA-REMOTE CONTROLLER
TERMINAL
BLOCK
POWER SUPPLY
SW2
SW3
SW4
SWE
CAPACITY CODE
MODE SELECTION
MODEL SELECTOR
DRAIN PUMP (TEST MODE)
SWITCH
EXTERNAL HEATER
CN24
PKFY-P12, 15, 18NHMU-E

8
5REFRIGERANT SYSTEM DIAGRAM
Strainer (#50mesh)
Strainer (#100mesh)
Strainer1 (#50mesh)
Strainer2 (#100mesh)
Heat exchanger
Room temparature thermistor TH21
Gas pipe thermistor TH23
Liquid pipe thermistor TH22
Linear expansion valve
Gas pipe
Liquid pipe
Flare connection
Gas pipe
Liquid pipe
PKFY-P12,15,18NHMU-E
:12.7(1/2)
:6.35(1/4)
Item
Service Ref.
Unit : mm (inch)
Gas pipe thermistor TH24
PKFY-P12, 15, 18NHMU-E

9
6MICROPROCESSOR CONTROL
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
ûF ûC
ûF ûC
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
INDOOR UNIT CONTROL
6-1. COOL OPERATION
<How to operate>
Press POWER ON/OFF button.
Press the operation MODE button to display COOL.
Press the TEMP. button to set the desired temperature.
NOTE: The set temperature changes 2°F when the or button is
pressed one time. Cooling 67 to 87°F
Control modes Control details
1-1. Thermoregulating function (Function to prevent restarting for 3 minutes)
• Room temperature desired temperature + 2°F
···Thermo ON
• Room temperature desired temperature ···Thermo OFF
1-2. Anti-freezing control
Detected condition : When the liquid pipe temp. (TH22) is 32°F or less in 16
minutes from compressors start up, anti-freezing control
starts and the thermo OFF.
Released condition : The timer which prevents reactivating is set for 3 minutes,
and anti-freezing control is cancelled when any one of the
following conditions is satisfied.
Liquid pipe temp. (TH22) turns 50°F or above.
The condition of the thermo OFF has become complete
by thermoregulating, etc.
The operation modes became mode other than COOL.
The operation stopped.
By the remote controller setting (switch of 3 speeds+Auto)
When [Auto] is set, fan speed is changed depending on the value of:
Room temperature - Desired temperature
2. Fan
1. Thermoregulating
function
Remarks
Type Fan speed notch
[Low], [Mid], [High], [Auto]
3 speeds + Auto type

(1)Initial setting: Start at COOL mode and horizontal vane.
(2)Vane position:
Horizontal Downward A Downward B Downward CDownward DSwingAuto
(3)Restriction of the downward vane setting
When setting the downward vane A, B, C or D in [Mid], [Low] or [Auto] of the fan
speed notch, the vane changes to horizontal position after 1 hour have passed.
3. Vane
(up/down vane change)
· "ONLY 1 Hr"
appears on the
wired remote
controller.

10
Control modes Control details
1-1. Thermo regulating function (Function to prevent restarting for 3 minutes)
Setting the Dry thermo by the thermo regulating signal and the room
temperature (TH21).
Dry thermo ON Room temperature desired temperature + 2°F
Dry thermo OFF Room temperature desired temperature
1-2. Freeze prevention control
No control function
Indoor fan operation controlled depending on the compressor conditions.
1. Thermo regulating
function
Remarks
Room
temperature
3 min. passed since starting operation
Thermo regulating signal
Room temperature (T1)
Dry thermo
ON
time (min)
Dry thermo
OFF
time (min)
Less than 64°F
Over 64°F
ON
OFF
T1 83°F
83°F > T1 79°F
79°F > T1 75°F
75°F > T1
Unconditional
93
73
53
33
10
3
Dry thermo OFF
2. Fan
Note: Remote controller setting is not acceptable.
Dry thermo Fan speed notch
Excluding the following
Room temp. < 64°F
ON
OFF
[Low]
[Low]
Stop
3. Vane
(up/down vane change)
Same control as COOL operation
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
ûF ûC
ûF ûC
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
6-2. DRY OPERATION
<How to operate>
Press POWER ON/OFF button.
Press the operation MODE button to display DRY.
Press the TEMP. button to set the desired temperature.
NOTE: The set temperature changes 2°F when the or button is
pressed one time. Dry 67 to 87°F

11
Control modes Control details
Set by remote controller.
When [Auto] is set, fan speed becomes [Low].
Remarks
1. Fan
Type Fan speed notch
3 speeds + Auto type [Low], [Mid], [High], [Auto]
2. Vane
(up/down vane change)
Same as the control performed during the COOL operation, but with no restriction
on the vane's downward blow setting
· Same control
as COOL
operation
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
ûF ûC
ûF ûC
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
6-3. FAN OPERATION
<How to operate>
Press POWER ON/OFF button.
Press the operation MODE button to display FAN.

12
Control modes Control details
1-1. Thermoregulating function (Function to prevent restarting for 3 minutes)
•
Room temperature desired temperature -2°F ···Thermo ON
•
Room temperature desired temperature ···Thermo OFF
1. Thermoregulating
function
Remarks
2-1. Hot adjust mode
The fan controller becomes the hot adjuster mode for the following conditions.
When starting the HEAT operation
When the thermoregulating function changes from OFF to ON.
When release the HEAT defrosting operation
2. Fan
A: Hot adjust mode starts.
B: 5 minutes have passed since the condition A or the indoor liquid pipe
temperature turned 95°F or more.
C: 2 minutes have passed since the condition B. (Terminating the hot adjust mode)
ACB
[Extra Low]
[Low]
Set fan speed by the remote controller
Hot adjust mode *1
2-2. Residual heat exclusion mode
When the condition changes the auxiliary heater ON to OFF (thermoregulating or
operation stop, etc), the indoor fan operates in [Low] mode for 1 minute.
· This control is
same for the
model without
auxiliary heater.
*1
"STAND BY"
will be displayed
during the hot
adjust mode.
To be continued on the next page.
By the remote controller setting (switch of 3 speeds+Auto)
When [Auto] is set, fan speed is changed depending on the value of:
Desired temperature - Room temperature
Give priority to under-mentioned controlled mode
2-1. Hot adjust mode
2-2. Residual heat exclusion mode
2-3. Thermo OFF mode (When the compressor off by the thermoregulating)
2-4. Cool air prevention mode (Defrosting mode)
Type Fan speed notch
[Low], [Mid], [High], [Auto]
3 speeds + Auto type
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
ûF ûC
ûF ûC
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
6-4. HEAT OPERATION
<How to operate>
Press POWER ON/OFF button.
Press the operation MODE button to display HEAT.
Press the TEMP. button to set the desired temperature.
NOTE: The set temperature changes 2°F when the or button is
pressed one time. Heating 63 to 83°F.
<Display in HEAT operation>
[DEFROST]
The [DEFROST] symbol is only displayed during the defrost operation.
[STANDBY]
The [STANDBY] symbol is only displayed during the hot adjust mode.

13

Control modes Control details
2. Fan
Remarks
2-3. Thermo OFF mode
When the thermoregulating function changes to OFF, the indoor fan operates in
[Extra low].
2-4. Heat defrosting mode
The indoor fan stops.
(1) Initial setting: OFF HEAT···[last setting]
When the last setting is [Swing] ··· [Downward D]
When changing the mode from exception of HEAT to HEAT operation
···[Downward D]
(2) Vane position:
Horizontal Downward A Downward B Downward CDownward DSwingAuto
(3) Restriction of vane position
The vane is horizontally fixed for the following modes.
(The control by the remote controller is temporally invalidated and control by
the unit.)
•Thermo OFF
•Hot adjust [Extra low] mode
•Heat defrost mode
3. Vane control
(Up/down vane
change)
From the preceding page
Control modes Control details
HEAT mode for room temperature < Desired temperature
COOL mode for room temperature Desired temperature
(1) HEAT mode COOL mode
Room temperature Desired temperature + 3°F. or 3 min. has passed
(2) COOL mode HEAT mode
Room temperature Desired temperature - 3°F. or 3 min. has passed
1. Initial value of
operation mode
Remarks
2. Mode change
Same control as cool operation
3. COOL mode
Same control as heat operation
4. HEAT mode
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
ûF ûC
ûF ûC
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
6-5. AUTO OPERATION [AUTOMATIC COOL/HEAT CHANGE OVER OPERATION]
<How to operate>
Press POWER ON/OFF button.
Press the operation MODE button to display AUTO.
Press the TEMP. button to set the desired temperature.
NOTE: The set temperature changes 2°F when the or button is
pressed one time. Automatic 67 to 83°F

14
TROUBLESHOOTING
7
7-1. HOW TO CHECK THE PARTS
PKFY-P12, 15, 18NHMU-E
Parts name Check points
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 50°F~86°F)
Disconnect the connector then measure the resistance value with a tester.
(Coil temperature 68°F)
Vane motor (MV)
Linear expansion
valve (LEV)
Refer to the next page for the details.
Room temperature
thermistor (TH21)
Liquid pipe temperature
thermistor (TH22)
Gas pipe temperature
thermistor (TH23 ,24)
Normal
4.3k~9.6k
Abnormal
Open or short
Normal
200± 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 with a tester. (Coil temperature 77°F)
Normal
350± 7%
Abnormal
-
Brown-Red
-
Brown-Orange
-
Brown-Yellow
-
Brown-Green
Open or short
Fan motor (MF)
 Red
 Yellow
 Brown
Orange

Green
Connect pin No.
M
1
2
3
4
5
6
LEV
White
Yellow
Orange
Blue
Red
Brown
CN60
Refer to 7-1-3.
7-1-2. Liner expansion valve
7-1-1. Thermistor
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) (TH24)
Thermistor R0=15kΩ± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
30°F 15.8kΩ
50°F 9.6kΩ
70°F 6.0kΩ
80°F 4.8kΩ
90°F 3.9kΩ
100°F 3.2kΩ
Thermistor for
lower temperature
Operation 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 signals.
<Connection between the indoor controller board and the linear expansion valve>
1
273+(t-32)/1.8
1
273
0
10
20
30
40
50
0-20 20 40 60 80 100 120
< Thermistor for lower temperature >
Temperature (°F)
Resistance (k)

1515
6
5
4
3
2
1
LED1k
Symptom Check points
Operation circuit
failure of the micro
processor
Disconnect the connector on the controller board, then con-
nect LED for checking.
When power is turned on, pulse signals will be output for 10
seconds. There must be some defects in the operation circuit
if the LED does not light while the signals are output or keeps
lighting even after the signals stop.
Countermeasures
Exchange the indoor con-
troller board at drive circuit
failure.
Linear expansion
valve mechanism is
locked.
Valve 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
is any leaking, detecting temperature of
the thermistor will go lower. If the detected
temperature is much lower than the tem-
perature indicated in the remote controller,
it means the valve is not closed all the way.
It is not necessary to exchange the linear expansion valve, if
the leakage is small and not affecting normal operation.
Thermistor
(Liquid pipe)
Linear
expansion
valve
Motor will idle and make a ticking noise when the motor is
operated while the linear expansion valve is locked.
This 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 valve.
Exchange the linear expan-
sion valve.
If large amount of refriger-
ant is leaked, exchange
the linear expansion valve.
Disconnect the connector
at the controller board,
then check the continuity.
Measure the resistance between each coil (white-red, yellow-
brown, orange-red, blue-brown) using a tester. It is normal if
the resistance is in the range of 200Ω±10%.
Short or breakage
of the motor coil of
the linear expansion
valve
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>
Linear expansion valve operation
Trouble shooting
D
A
E
B
C
Open
Open
Extra tightening (200~800 pulse)
Pulse number
Outdoor unit R410A model : 1400 pulse
Outdoor unit R22 model : 2000 pulse
Opening a valve all the way
Close
Close
Valve position (capacity)
Closing a valve : 1 →2 →3 →4 →1
Opening a valve : 4 →3 →2 →1 →4
The output pulse shifts in above order.
Note:
• When linear expansion valve operation stops, all output phase
become OFF.
• At phase interruption or when phase does not shift in order, motor
does not rotate smoothly and motor will lock and vibrate.
• When the switch is turned on, 2200 pulse closing valve signal will
be sent till it goes to point in order to define the valve position.
• When the valve moves smoothly, there is no sound or vibration
occurring from the linear expansion valves, however, when the
pulse number moves from to or when the valve is locked,
more sound can be heard than in a normal situation.
• Sound can be detected by placing the ear against the screw driver
handle while putting the screw driver tip to the linear expansion
valve.

16
7-1-3. DC Fan motor (fan motor/indoor controller circuit board)
Notes
· High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.
· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit board and fan motor.)
Self check
Symptom : The indoor fan cannot turn around.
Yes
NG
NG
NG
Wiring contact check
Contact of fan motor connector (CNMF)
Power supply check (Remove the connector (CNMF))
Measure the voltage in the indoor controller circuit board.
TEST POINT : VDC (between 1 (+) and 3 (-) of the fan connector): VDC DC294~325V
TEST POINT : VCC (between 4 (+) and 3 (-) of the fan connector): VCC DC15V
Wiring recovery
Replace indoor controller board.
Replace indoor controller board.
Replace the fan motor
Replace the fan motor
Indoor controller board fuse check
Replace indoor
controller board
Replace the fan motor.
Is the voltage normal?
Is there contact failure?
No
Yes
No
No
Is the fuse normal? Replace the fuse
Yes
Check the operation END
OK
Check the operation END
Check the operation END
OK
Check the operation END
OK
NG
OK
Check method of DC fan motor (fan motor/indoor controller circuit board)
Sensor signal check
Measure the voltage between CNMF and DC 0V
and DC 15V in the indoor controller circuit board.
Does the voltage repeat
DC 0V and DC 15V?
No
Yes

17
7-2. Function of Dip switch
PKFY-P12, 15, 18NHMU-E
1
2
3
4
5
6
7
8
9
10
1~6
1
2
3
4
5
6
7
8
Thermistor<Room temperature>
position
ON OFF
Filter clogging detection Provide Not provide
Filter cleaning sign 2,500 hr 100 hr
Fresh air intake Not effective Not effective
Switching remote controller display Thermo ON signal indication Fan output indication
Humidifier control Fan operation at Heating mode
Thermo ON operation at
heating mode
Low +1 Extra low +1
Setting air flow +1 Depends on SW1-7
Auto restart function Effective Not effective
Power ON/OFF by breaker Effective Not effective
Heat pump/Cool only Cooling only Heat pump
Not used
Not used
Vane horizontal angle Second setting +1 First setting
Effective Not effective
Heating 4 degree up Not effective Effective
Target superheat setting +2 —
——
——
—
Target subcool +2 ——
ON
OFF
1234567 8
ON
OFF
12345678910
Address board
<Initial setting>
Indoor controller board
<Initial setting>
SW3
Function
selection
Under
suspension
SW2
Capacity
code
Before
power
supply
ON
switch
SW1
Mode
Effective
timing
Under
suspension
selection
Switch Pole Function
Operation by switch
Remarks
Built-in remote controller
Indoor unit
Changing the opening of linear
expansion valve during thermo OFF
+
1
SW1-7
OFF
ON
OFF
ON
SW1-8
OFF
OFF
ON
ON
Fan speed
Extra low
Low
Setting air flow
Stop
+2 It is impossible to intake
the fresh air.
+1 Second setting is same as
first setting.
+2 Please do not use SW3-7,8
as trouble might be caused
by the usage condition.
Air flow set in case of heat
thermo OFF
NOTE:
+2
Models SW2
P12
P15
P18
123456
ON
OFF
123456
ON
OFF
123456
ON
OFF
Indoor controller board
Indoor controller board
1~4 ON
OFF
1234
SW4
Model
selection
In case of replacing the indoor controller board, make sure to set the
switch to the initial setting, which is shown below.
Before
power
supply
ON

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

19
7-3. TEST POINT DIAGRAM
7-3-1. Indoor controller board
PKFY-P12NHMU-E
PKFY-P15NHMU-E
PKFY-P18NHMU-E
CN3A
Connected to the termial
block (TB15)
(MA-Remote controller
connecting wire)
1- 3 :8.7-13V DC
(Pin1 (+))
CN44
Pipe temperature thermistor
1-2: Liquid (TH22)
3-4: Gas1 (TH23)
SW4
Model selection
CND
Power supply for
indoor controller board
1-3: 208/230VAC
SW2
Capacity setting
LED1
Main power supply
(Indoor unit :
208/230VAC)
CN20
Room temperature
thermistor (TH21)
LED2
Power supply for
MA-Remote controller
CN32
Remote switch
Jumper wire J41, J42
Pair No. setting for wireless
remote controller
LDSWE(A)
Connect to the
wireless remote
controller board
(S.B)
CN2M
Connect to the
terminal block (TB5)
(M-NET transmission
connecting wire)
24-30VDC (non-polar)
Power supply from
outdoor unit
SW3
Function setting
CN2G
Pipe temperature
thermistor
Gas2 (TH24)
CN24
External heater
CN51
Centrally control-
led
CN60
Liner expansion
valve (LEV) output
12VDC pluse output
CN52
Remote indicator
CNRU
Connect to the
wireless remote
controller board
(W.B)
CN151
Vane motor output
12VDC pluse
FUSE
3.15A 250V
CNMF
Connect to the fan motor (MF)
1-3: DC294~325V
4-3: DC15V
5-3: DC0~6V
6-3: DC0 or DC15V (Stop)
DC7.5V (Operation)
(12VDC pluse)
LD SWE (B)
Connect to the indoor
controller board (I.B)

20
1234 56789 10
1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
0

1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0

7-3-3. Address board
PKFY-P12NHMU-E
PKFY-P15NHMU-E
PKFY-P18NHMU-E
SW1
Function setting
SW12
Address setting
10ths DIGIT
SW11
Address setting
1s DIGIT
7-3-2. Wireless remote controller board
PKFY-P12NHMU-E
PKFY-P15NHMU-E
PKFY-P18NHMU-E
LD101
Connect to the
indoor controller
board (I.B)
SW14
Branch No.