Mitsubishi Electric CITY MULTI PEFY-P40VMHS-E Operating manual

AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Model name
<Indoor unit>
Model name
<Indoor unit>
PEFY-P40VMHS-E, PEFY-P50VMHS-E
PEFY-P63VMHS-E, PEFY-P71VMHS-E
PEFY-P80VMHS-E, PEFY-P100VMHS-E
PEFY-P125VMHS-E, PEFY-P140VMHS-E
Series PEFY Ceiling Concealed
2017
Indoor unit

1
SAFETY PRECAUTIONS
Read before installation and performing electrical work
Symbol explanations
Thoroughly read the following safety precautions prior to installation.
Observe these safety precautions for your safety.
This equipment may have adverse effects on the equipment on the same power supply system.
Contact the local power authority before connecting to the system.
WARNING
This symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or death.
CAUTION
This symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or dam-
age to the unit.
Indicates an action that must be avoided.
Indicates important instructions.
Indicates a parts that requires grounding.
Indicates that caution must be taken with rotating parts. (This symbol is on the main unit label.) <Color: Yellow>
Indicates that the parts that are marked with this symbol pose a risk of electric shock. (This symbol is on the main
unit label.) <Color: Yellow>
WARNING
Carefully read the labels affixed to the main unit.
WARNING
Ask your dealer or a qualified technician to install the unit.
Improper installation by the user may result in water leak-
age, electric shock, or fire.
Properly install the unit on a surface that can withstand its
weight.
Unit installed on an unstable surface may fall and cause in-
jury.
Only use specified cables. Securely connect each cable so
that the terminals do not carry the weight of the cable.
Improperly connected cables may produce heat and start a
fire.
Take appropriate safety measures against wind gusts and
earthquakes to prevent the unit from toppling over.
Improper installation may cause the unit to topple over and
cause injury or damage to the unit.
Only use accessories (i.e., air cleaners, humidifiers, electric
heaters) recommended by Mitsubishi Electric.
Do not make any modifications or alterations to the unit.
Consult your dealer for repair.
Improper repair may result in water leakage, electric shock,
or fire.
Do not touch the heat exchanger fins with bare hands.
The fins are sharp and pose a risk of cuts.
In the event of a refrigerant leak, thoroughly ventilate the
room.
If gaseous refrigerant leaks out and comes in contact with
an open flame, toxic gases will be generated.
Properly install the unit according to the instructions in the
Installation Manual.
Improper installation may result in water leakage, electric
shock, or fire.
Have all electrical work performed by an authorized electri-
cian according to the local regulations and the instructions
in this manual. Use a dedicated circuit.
Insufficient power supply capacity or improper installation
of the unit may result in malfunctions of the unit, electric
shock, or fire.

2
       

Keep electrical parts away from water.
Wet electrical parts pose a risk of electric shock, smoke, or
fire.
Securely attach the control box cover.
If the cover is not installed properly, dust or water may infil-
trate and pose a risk of electric shock, smoke, or fire.
Only use the type of refri erant that is indicated on the unit
when installin or relocatin the unit.
Infiltration of any other types of refri erant or air into the unit
may adversely affect the refri erant cycle and may cause
the pipes to burst or explode.
When installin the unit in a small space, take appropriate
precautions to prevent leaked refri erant from reachin the
limitin concentration.
Leaked refri erant as will displace oxy en and may cause
oxy en starvation. Consult your dealer before installin the
unit.
Consult your dealer or a qualified technician when movin
or reinstallin the unit.
Improper installation may result in water leaka e, electric
shock, or fire.
After completin the service work, check for a refri erant
leak.
If leaked refri erant is exposed to a heat source, such as a
fan heater, stove, or electric rill, toxic ases will be ener-
ated.
Do not try to defeat the safety features of the unit.
Forced operation of the pressure switch or the temperature
switch by defeatin the safety features for these devices, or
the use of accessories other than the ones that are recom-
mended by Mitsubishi Electric may result in smoke, fire, or
explosion.
Consult your dealer for proper disposal method.
Do not use a leak detection additive.

Do not use the existin refri erant pipin .
Alar e amount of chlorine that may be contained in the re-
sidual refri erant and refri erator oil in the existin pipin
may cause the refri erator oil in the new unit to deteriorate.
Use refri erant pipin materials made of phosphorus deox-
idized copper. Keep the inner and outer surfaces of the
pipes clean and free of such contaminants as sulfur, oxides,
dust, dirt, shavin particles, oil, and moisture.
Contaminants in the refri erant pipin may cause the refri -
erator oil to deteriorate.
Store the pipin materials indoors, and keep both ends of
the pipes sealed until immediately before brazin . (Keep el-
bows and other joints wrapped in plastic.)
Infiltration of dust, dirt, or water into the refri erant system
may cause the refri erator oil to deteriorate or cause the
compressor to malfunction.
Use a small amount of ester oil, ether oil, or alkyl benzene
to coat flares and flan es.
Infiltration of a lar e amount of mineral oil may cause the re-
fri erator oil to deteriorate.
Char e the system with refri erant in the liquid phase.
If aseous refri erant is drawn out of the cylinder first, the
composition of the remainin refri erant in the cylinder will
chan e and become unsuitable for use.
Only use R410A.
The use of other types of refri erant that contain chloride
may cause the refri erator oil to deteriorate.
Useavacuum pump with a check valve.
If a vacuum pump that is not equipped with a check valve is
used, the vacuum pump oil may flow into the refri erant cy-
cle and cause the refri erator oil to deteriorate.
Prepare tools for exclusive use with R410A. Do not use the
followin tools if they have been used with the conventional
refri erant: au e manifold, char in hose, as leak detec-
tor, check valve, refri erant char e base, vacuum au e,
and refri erant recovery equipment.
If the refri erant or the refri erator oil that may be left on these
tools are mixed in with R410A, it may cause the refri erator oil
in the new system to deteriorate.
Infiltration of water may cause the refri erator oil to deteriorate.
Leak detectors for conventional refri erants will not detect an
R410A leak because R410A is free of chlorine.
Do not use a char in cylinder.
If a char in cylinder is used, the composition of the refri erant
in the cylinder will chan e and become unsuitable for use.
Exercise special care when handlin tools for use with R410A.
Infiltration of dust, dirt, or water into the refri erant system
may cause the refri erator oil to deteriorate.

CONTENTS
SAFETY PRECAUTIONS ·························································································· 1
1. FEATURES ··········································································································· 4
2. PART NAMES AND FUNCTIONS ········································································ 5
3. SPECIFICATION ··································································································· 8
4. OUTLINES AND DIMENSIONS ·········································································· 11
5. WIRING DIAGRAM ······························································································ 13
6. REFRIGERANT SYSTEM DIAGRAM ································································· 14
7. TROUBLE SHOOTING ························································································ 15
8. DISASSEMBLY PROCEDURE ············································································· 22
3

4
PEFY-P40VMHS-E
PEFY-P50VMHS-E
PEFY-P63VMHS-E
PEFY-P71VMHS-E
PEFY-P80VMHS-E
PEFY-P100VMHS-E
PEFY-P125VMHS-E
PEFY-P140VMHS-E
4.5 / 5.0
5.6 / 6.3
7.1 / 8.0
8.0 / 9.0
9.0 / 10.0
11.2 / 12.5
14.0 / 16.0
16.0 / 18.0
FEATURES
1
Indoor unit
Ceiling Concealed
Series PEFY
Models Cooling capacity/Heating capacity
kW

PART NAMES AND FUNCTIONS
2
Air inlet
Air outlet
2-1. Indoor (Main) Unit
5

Fri
Room
Set temp.
Mode Temp. Fan
Cool Auto
Main
Main display:
Cursor Page
Main menu
Vane • Louver • Vent. (Lossnay)
High power
Timer
Weekly timer
OU silent mode
2-2. Remote Controller
[PAR-32MAA]
Once the operation mode is selected, the unit will remain in the selected mode until changed.
(1) Remote Controller Buttons
Function buttons
The functions of the function buttons change depending on the screen.
Refer to the button function guide that appears at the bottom of the LCD for
the functions they serve on a given screen.
When the system is centrally controlled, the button function guide that
corresponds to the locked button will not appear.
Function guide
Main menuMain display
Press to turn ON/OFF the indoor unit.
Press to save the setting.
Press to return to the previous screen.
Press to bring up the Main menu.
Operation settings will appear.
When the backlight is off, pressing any button turns the backlight on and it will
stay lit for a certain period of time depending on the screen.
When the backlight is off, pressing any button turns the backlight on
and does not perform its function. (except for the [ON/OFF] button)
This lamp lights up in green while the unit is in operation. It blinks while the
remote controller is starting up or when there is an error.
Main display: Press to change the operation mode.
Main menu: Press to move the cursor down.
Main display: Press to decrease temperature.
Main menu: Press to move the cursor up.
Main display: Press to increase temperature.
Main menu: Press to go to the previous page.
Main display: Press to change the fan speed.
Main menu: Press to go to the next page.
E
F
I
J
G
H
A
B
C
D
E
F
I JG H
ABCD
I JG H I JG H
6

7
Fri
Mode Temp. Fan
Room
Cool Auto
Set temp.
Fri
Cool
Mode Temp. Fan
AutoSet temp.
(2) Remote Controller Display
The main display can be displayed in two different modes: "Full" and "Basic."
The factory setting is "Full." To switch to the "Basic" mode, change the setting on the "Main display" setting screen (Main menu > Initial setting >
Main display).
Full mode Basic mode
* All icons are displayed for explanation.
Indoor unit operation mode appears here.
Set temperature appears here.
Current time appears here.
Fan speed setting appears here.
Functions of the corresponding buttons appear here.
Appears when the ON/OFF operation is centrally controlled.
Appears when the operation mode is centrally controlled.
Appears when the set temperature is centrally controlled.
Appears when the filter reset function is centrally controlled.
Current room temperature appears here.
Appears when the buttons are locked.
Appears when the On/Off timer, Night setback, or Auto-off timer function is
enabled.
appears when the timer is disabled by the centralized control system.
Appears when the Weekly timer is enabled.
Appears while the units are operated in the energy-save mode. (Will not
appear on some models of indoor units)
Appears while the outdoor units are operated in the silent mode.
Appears when the built-in thermistor on the remote controller is activated to
monitor the room temperature ( ).
appears when the thermistor on the indoor unit is activated to monitor the
room temperature.
Indicates the vane setting.
Indicates the louver setting.
Indicates the ventilation setting.
Appears when the set temperature range is restricted.
Most settings (except ON/OFF, mode, fan speed, temperature) can
be made from the Main menu.
Indicates when filter needs maintenance.
11
12 13 14 15 16 17 18
19
20
1
3
4
9
21 2
5
7
10
11
1
6
8
2
3
4
5
15
16
17
18
19
20
21
9
10
12
13
14
6
7
8
11
Room temperature
Operation mode
1
Set temperature
2
Clock
Fan speed
Button function guide
3
4
5

8
3SPECIFICATION
3-1. Specification
Power source
Model
kWCooling capacity ❇1
kW
kWCooling
Heating
Cooling
Heating
kW
A
A
mm
mm
mm
kg
m3/min
Pa 50/100/150/200
kW
mm
mm
dB(A) 20-23-27 24-27-32 24-26-30
Heating capacity ❇1
Power
consumption
Current
External finish
Dimension
Height
Width
Depth
Net weight
Heat exchanger
Fan
Type
Airflow rate
(Lo-Mid-Hi)
External static pressure
❇2
Motor Output
Type
Air filter (option)
Refrigerant
pipe dimension
Gas
(Brazed)
Liquid
(Brazed)
Drain pipe dimension
Noise level (Lo-Mid-Hi)
745 1030
35
Cross fin (Aluminum plate fin and copper tube)
Sirocco fan✕
DC motor
Synthethic fiber unwoven cloth filter(long life)
10.0-12.0-14.0
~220-240V 50Hz /60Hz
PEFY-P40VMHS-E PEFY-P50VMHS-E
5.64.5
6.35.0
Galvanizing
380
900
1 Sirocco fan✕2
12.7
6.35
32 (1-1/4 inch)
0.121
0.055
0.055
0.41
0.41
0.090
0.090
0.64
0.64
0.075
0.075
0.54
0.54
45
ø
ø9.52 ø
PEFY-P63VMHS-E
7.1
8.0
ø15.88
13.5-16.0-19.0
0.244
PEFY-P71VMHS-E
8.0
9.0
15.5-18.0-22.0
Note: ❇1 Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Cooling : Indoor 27˚CDB/19 ˚CWB,Outdoor 35˚CDB (WR2: water 30˚C)
Heating : Indoor 20˚CDB,Outdoor 7˚CDB/6˚CWB (WR2: water 20˚C)
❇2 The external static pressure is set to 50Pa at factory shipment.

9
Power source
kWCooling capacity ❇1
kW
kWCooling
Heating
Cooling
Heating
kW
A
A
mm
mm
mm
kg
m3/min
Pa 50/100/150/200
kW
mm
mm
dB(A) 25-27-30 27-31-34 27-32-36
Heating capacity ❇1
Power
consumption
Current
External finish
Dimension
Height
Width
Depth
Net weight
Heat exchanger
Fan
Type
Airflow rate
(Lo-Mid-Hi)
Motor Output
Type
Air filter (option)
Refrigerant
pipe dimension
Gas
(Brazed)
Liquid
(Brazed)
Drain pipe dimension
Noise level (Lo-Mid-Hi)
~
1030 1195
45
Cross fin (Aluminum plate fin and copper tube)
DC motor
Synthethic fiber unwoven cloth filter(long life)
18.0-21.5-25.0
220-240V 50Hz /60Hz
PEFY-P80VMHS-E
PEFY-P100VMHS-E
11.29.0
12.510.0
Galvanizing
380
900
Sirocco fan ✕2
32 (1-1/4 inch)
0.244
0.160
0.160
1.05
1.05
0.190
0.190
1.24
1.24
0.090
0.090
0.63
0.63
51 53
15.88
ø
9.52
ø
PEFY-P125VMHS-E
14.0
16.0
26.5-32.0-38.0
0.375
PEFY-P140VMHS-E
16.0
18.0
28.0-34.0-40.0
Note: ❇1 Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Cooling : Indoor 27˚CDB/19 ˚CWB,Outdoor 35˚CDB (WR2: water 30˚C)
Heating : Indoor 20˚CDB,Outdoor 7˚CDB/6˚CWB (WR2: water 20˚C)
❇2 The external static pressure is set to 50Pa at factory shipment.
Model
External static pressure
❇2

10
DC12V Stepping motor
0~1800pulse
DC12V Stepping motor
0~1800pulse
DC12V
Stepping motor
0~1800pulse
LEV
MF1,2
3-2. Electrical parts specifications
Model
Parts
name
TH21 Resistance 0˚C/15kΩ,10˚C/9.6kΩ,20˚C/6.3kΩ,25˚C/5.4kΩ,30˚C/4.3kΩ,40˚C/3.0kΩ
TH22 Resistance 0˚C/15kΩ,10˚C/9.6kΩ,20˚C/6.3kΩ,25˚C/5.4kΩ,30˚C/4.3kΩ,40˚C/3.0kΩ
Gas pipe
thermistor
FUSE 250V 6.3A
TB2 (L,N, ) 250V 20A
TB5
TB15
(M1,M2,S) 250V 20A
(1,2) 250V 15A
Fuse
(Indoor con-
troller board)
Power supply
terminal bed
Transmission
terminal bed
Room
temperature
thermistor
Fan motor
(with Inner-
thermostat)
8-pole, output 121W
SIC-70CW-D8121-3
8-pole, output 244W
SIC-101CW-D8244-3
10-pole, output 375W
KMUC4E1MW
Symbol
TH23 Resistance 0˚C/15kΩ,10˚C/9.6kΩ,20˚C/6.3kΩ,25˚C/5.4kΩ,30˚C/4.3kΩ,40˚C/3.0kΩ
Liquid pipe
thermistor
Linear
expansion valve
PEFY-
P40VMHS-E
PEFY-
P50VMHS-E
PEFY-
P63VMHS-E
PEFY-
P71VMHS-E
PEFY-
P80VMHS-E
PEFY-
P100VMHS-E
PEFY-
P125VMHS-E
PEFY-
P140VMHS-E

11
4OUTLINES AND DIMENSIONS
Unit : mm
4-1. OUTLINES AND DIMENSIONS
Drain hose (I.D.ø32)
(Actual length)
<Accessory>
Note 1.
2. 3.
Use an M10 screw for the suspension bolt (field supply). This drawing is for PEFY-P71·80·100·125·140VMHS-E models, which have 2 fans.PEFY-P40·50·63VMHS-E models have 1 fan. Make sure to install the air filter (field supply) on the air intake side. In case field supplied air filter is used, attach it where the filter service is easily done.
DE GHFACBLiquid pipe
ø6.35ø12.7 ø9.52ø15.88
1085 1250
Gas pipe
PEFY-P71
·
80VMHS-E
PEFY-P100
·
125
·
140VMHS-E
1039 1204
754
965
1130
680
885
1050
600
835
1000
550
42.5
25 50
17 21
11
800
1000
700 900
J
67 50 50
LK
800
15 19 10
500 450
PEFY-P63VMHS-E PEFY-P40
·
50VMHS-E
Model
Inlet air side view
Top
view
Outlet air
side view
Top
Bottom
Piping
side view
Air inlet Air outlet
2x5-ø3 holes
15
L
50
50x(J-1)=K
23 B(Suspension bolt pitch)
A
814 904
900
847
10
41
E(Duct)
94250
2xJ-ø3 holes
143
25 50x4=200
45 50x5=250
380
F
50
40
65 C
50x(G-1)=H
10
16 340
D(Duct)
(Duct)
Suspension bolt hole
(Suspension bolt pitch)
80
4-14x30 Slot
2xG-ø3 holes
(Duct)
Te r minal block
(Power source)
Control box
brazing connection (gas)
Drain pipe
2x6-ø3 holes
brazing connection (liquid)
(O.D.ø32)
(Gravity drain)
Refrigerant piping
Refrigerant piping
115
44.5
115
(Transmission)
29
60
24 29
15
50
Te r minal block
187
69
344.5
58
50
32
0
-10
2
2
1
1

12
Unit : mm
Model C M N
PEFY-P40·50VMHS-E 680 780 0~50 PEFY-P63VMSH-E PEFY-P71·80VMHS-E 965 1065 100~150 PEFY-P100·125·140VMHS-E 1130 1230 200~250
[Maintenance access space] Secure enough access space to allow for the maintenance, inspection, and replacement of the motor, fan, heat exchanger, drain pan and control box in one of the following ways. Select an installation site for the indoor unit so that it's maintenance access space will not be obstructed by beam or other objects. Create access door 1 (450x450mm) for the maintenance from the unit side when the thermistor, LEV and control box is exchanged. (Fig.2,4) (1) When a space of 300mm or more is available below the unit between the unit and the ceiling.
Create access door 2 (600x600mm) for the maintenance from the bottom when the motor, fan, heat exchanger and drain pan is cleaned (exchanged). (Fig.2)
(2) When a space of less than 300mm is available below the unit between the unit and the ceiling.
(At least 20mm of space should be left below the unit as shown in Fig.3.) Create access door 3 for the maintenance from the bottom when the motor, fan, heat exchanger and drain pan is cleaned (exchanged). (Fig.4)
Supply air
Intake air
Control box
Access door 1
Ceiling Ceiling beam
Min. 20mm
Min. 20mm
Control box
Access door 3
Access door 1 (450x450)
50900
450
100~200
1000
M
50 C
150~200
450
Bottom of
indoor unit
(Viewed from the direction
of the arrow Y)
Maintenance access space
Fig.4
Supply
air
Intake
air
Y
Fig.3
Supply air
Intake air
Control box
Access door 1
Ceiling Ceiling beam
Min. 20mm
Min. 300mm
Control box Access door 2 (600x600) Access door 1 (450x450)
450100~200
C
150~200
450
Bottom of
indoor unit
(Viewed from the direction of the arrow Z)
Maintenance access space
Fig.2
Supply
air
Intake
air
Z
Fig.1
600
600
900
150~200
N
50

13
5WIRING DIAGRAM
LN
ON OFF
7
CND
I.B.
CNMF1
INSIDE SECTION OF CONTROL BOX
SWE
TB2
13CNP
LED1
POWER SUPPLY ~220,230,240V
50/60Hz
FS
ACL
M1 M2
TB5
531
4321
S
1
CN2M
2
12
TB15
1
CN3A
3
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
SW12
(10ths digit)
SW1 SW2 SW3 SW4
SW21 SW22
2
CN20
1
2
CN4F
1
43 2
CN44
1
43
1
CN60
2 3 4 5 6
DP
M
1~
LEV
M
1
CN90
456723 89
(SHEILD)
RECEIVER
RU
CN1
LED1
SW1SW2
W.B.
BZ1
543216789
t˚ t˚ t˚
TH21 TH22TH23
2
CN4F
1
43
TO NEXT INDOOR UNIT
BREAKER(16A)FUSE(16A)
PULL BOX
TO MA
REMOTE
CONTROLLER
TO OUT DOOR UNIT BC CONTROLLER REMOTE CONTROLLER
MF
M
1~
13CNACL
7
CNDB
531
1
2 3
4
DB
+-
LED2
CN2A
(Red)
(Black)
SA U
U
ZNR001
ZNR002
F1
CN41 CN51
CN52
(Green)
CN32
(Red) (Blue)
(Blue)
(Black)
*Optional parts
*Optional parts
*Optional parts
CN105
(Red)
SW11
(1s digit)
0
8
7
6
5
4
3
2
1
SW14
(BRANCH No.)
F
E
D
C
B
A
9
DC280
~340V
21 21
3CNE
(White)
3
ACL
SYMBOL SYMBOL
AC reactor (Power factor improvement)
Diode Bridge Drain Pump Float switch Fan Motor Power source terminal block Transmission terminal block Transmission terminal block Thermistor (inlet air temp.detection) Thermistor (piping temp.detection/liquid) Thermistor (piping temp.detection/gas)
DB
DP
FS
MF
TB2 TB5
TB15
TH21 TH22 TH23
CN2A Connector (0-10V Analog input) CN32 Connector (Remote switch) CN41 Connector (HA terminal-A) CN51 Connector (Centrally control) CN52 Connector (Remote indication) CN90 Connector (Wireless) CN105 Connector (IT terminal) SW1 Switch (for mode selection) SW2 Switch (for capacity code) SW3 Switch (for mode selection)
SW14 Switch (BRANCH No.) SW21
Switch (for static pressure selection)
SW22
Switch (for static pressure selection)
SWE Connector (emergency operation) LED1 LED (Power supply) LED2 LED (Remote controller supply)
NAME SYMBOL NAMENAME
I.B. Indoor controller board
SA Arrester
F1 Fuse AC250V 6.3A
ZNR001,002
Varistor
SW4 Switch (for model selection) SW11 Switch (1s digit address set)
W.B. Wireless remote controller board
BZ1 Buzzer LED1 LED (Run indicstor) RU Receiving unit SW1 SW2
Switch (Heating on/off) Switch (Cooling on/off)
SW12 Switch (10ths digit address set)
I.B. Indoor controller board I.B. Indoor controller board
Electrical linear expansion valve
LEV
SYMBOL EXPLANATION
Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring for servicing. Symbols used in wiring diagram are
: Connector, : Terminal, (Heavy dotted line): Field wiring, (Thin dotted line): Optional parts.
Have all electric work done by a licensed electrician according to the local regulations. Earth leakage circuit breaker should be set up on the wiring of the power supply. To perform a drainage test for the drain pump turn on the SWE on the control board while the indoor unit is being powered.
* Be sure to turn off the SWE after completing a drainage
test or test run.
NOTE)1.
2. 3. 4. 5.

14
REFRIGERANT SYSTEM DIAGRAM
6
Strainer (#100mesh)
Strainer (#100mesh)
Heat exchanger
Room temperature thermistor TH21
Gas pipe thermistor TH23
Liquid pipe thermistor TH22
Linear expansion valve
Gas pipe
Brazed joints
Gas pipe
PEFY-P40,50VMHS-E
Liquid pipe
Capacity
Item
ø12.7 <1/2F>
ø6.35 <1/4F>
ø15.88 <5/8F>
ø9.52 <3/8F>
PEFY-P63,71,80,100,125,140VMHS-E

15
7TROUBLE SHOOTING
7-1. Check methods
1. Component and check points
(1) Thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 10°C - 30°C)
AbnormalNormal
4.3k - 9.6k Open or short
1) Thermistor characteristic graph
(Refer to the thermistor characteristic graph below.)
Low-temperature thermistor
Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)
Drain sensor (DS)
Thermistor R0= 15 k 3%
Multiplier of B = 3480 k 2%
9.6k
6.3k
5.2k
4.3k
3.0k
(A) Temperature (°C)
(B) Resistance (k )
Rt = 15 exp { 3480( ) }
1
273+t
1
273
(B)
10
20
30
40
50
-20 -10 0 10 20 30 40 50
(A)
0
(2) Fan motor (CNMF)
Refer to the page on "DC fan motor (fan motor/indoor control board)."
(3) Linear expansion valve
Disconnect the connector, and measure the resistance between terminals with a tester.
Refer to the next page for details.
(A) Red (E) Yellow
(C) Blue (F) White
(D) Orange
AbnormalNormal
1-6 2-6 3-6 4-6 Open or short
White-Red Yellow-Red Orange-Red Blue-Red
(150 ) 10%
1
2
3
4
6
M
(A)
(C)
(D)
(E)
(F)
CN60
LEV
15k0°C
10°C
20°C
25°C
30°C
40°C

1) Summary of linear expansion valve (LEV) operation
The LEV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board.
The LEV position changes in response to the pulse signal.
Indoor control board and LEV connection
(G)
Pulse signal output and valve operation
The output pulse changes in the following order:
When the valve closes 1 -> 2 -> 3 -> 4 -> 1
When the valve opens 4 -> 3 -> 2 -> 1 -> 4
When the valve position remains the same, all output signals will be OFF.
If any output signal is missing or if the signal remains ON, the motor vibrates and makes clicking noise.
(A) Red (G) Control board
(C) Blue (H) Connection (CN60)
(D) Orange (I) Drive circuit
(E) Yellow (J) Linear expansion valve
(F) White
Phase
number
1ONOFF OFF ON
2ONONOFF OFF
3 OFF ON ON OFF
4 OFF OFF ON ON
Output pulse
1234
1
(H)
(J) (A)
(A)
(B)
(C)
(C)
(D)
(D) (E)
(E)
(F)
(F)
M
4
6
2
3
5
1
4
3
6
5
2
(I)
12VDC
16

6
5
4
3
2
1
1 k
LED
When the power is turned on, a pulse signal of fully open pulse + 10% pulse is output (valve closure signal), to bring the valve
to position A.
When the valve is operating normally, it is free of vibration noise. If the valve locks or when it goes from point E to A in the
figure, it makes louder noise than would be heard when there is an open phase.
Check for abnormal sound/vibration by placing the metal tip of a screwdriver against the valve and the handle side against
your ear.
3) Troubleshooting
RemedyChecking CriteriaSymptom
Circuit failure on
the microcomputer
Disconnect the connectors on the control board, and connect LEDs to test the cir-
cuit as shown below.
Pulse signals are output for 10 seconds when the main power is turned on. If there
are LEDs that do not light up at all or remain lit after the pulses are turned off, there
is a problem with the driving circuit.
Replace the in-
door control
board if driving
circuit failure is
detected.
If this clicking noise is heard both when the valve is fully closed and while it is being
opened, it indicates a problem.
Replace the LEV.
Measure the resistance between the coils with a tester (red-white, red-orange,
Red-yellow, Red-blue). The normal range of resistance is 150 10%
Replace the LEV.
2) LEV operation
(a) Close
(b) Open
(c) Fully open valve (2000 pulses)
(d) No. of pulses
(e) Extra tightening (41 pulses)
(f) Valve opening degree
(f)
(e)
(a)
(b)
(d)
(c)
Locked LEV
Disconnected or
shorted LEV motor
coils
The motor will idle and make small clicking noise if it is run while the LEV is locked.
17

Disconnect the connector, and measure the resistance between terminals with a tester.
2. Check if the drain pump works and drains water properly in cooling operation.
3. If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the
operation starts.
Note: The drain pump for this model is driven by the internal DC motor of controller board, so it is not
possible to measure the resistance between the terminals.
The fan starts to rotate.
Purple
- Black: Abnormal (check code 2502) if it outputs 0-13 V square wave (5 pulses/rotation), and
the number of rotaion is not normal.
(A) Moving part
(B) Switch
(C) Magnet
Position of the moving part Normal Abnormal
Up Short (any position but short)
Down Open (any position but open)
(5) Drain float switch (CN4F)
1. Check if the drain float switch works properly.
Normal
Red
- Black: Input 13V DC
(4) Drain pump
Valve closure fail-
ure (leaky valve)
To check the LEV on the indoor unit, check the indoor unit liquid pipe temperature
that appears on the operation monitor on the outdoor unit's multi control board while
operating the indoor unit in question in the FAN mode and the other indoor units in
the cooling mode.
Replace the LEV
if the amount of
leakage is great.
(A)Termistor (TH21)
Normally, the LEV is fully closed while the unit is in the FAN mode. If the valve is
leaky, liquid pipe thermistor reading will be lower than normal. If it is significantly
lower than the inlet temperature on the remote controller, valve closure failure is
suspected. If the amount of leakage is insignificant, replacement of LEV is unnec-
essary unless it is causing a problem.
Misconnections of
connectors or con-
tact failure
Perform a visual check for disconnected connectors.
Perform a visual check of lead wire color.
Disconnect the
connectors on
the control board
and perform a
continuity test.
(A)
LEV
Red
Purple
Black
1
2
3
1
2
3
4
(A)
(A)
(B)
(C)
18

7-2. DC fan motor (fan motor/indoor control board)
1. CAUTION
A high voltage is applied to the connector for connection to the fan motor (CNMF1).
Do not unplug the connector CNMF1 with the unit energized to avoid damage to the indoor control board and fan motor.
2. Troubleshooting
Symptom: Indoor unit fan does not run.
Check fan motor connector contact
(CNMF1).
Fix the connection.
Yes
No
Is the fan motor connector
(CNMF1) fully inserted?
Replace the indoor control board.
Yes
No
Is the voltage within the
normal range?
Check the power supply.
Measure the voltage at the indoor control board.
15VDC (same with the voltage between fan connector 5 (+) and 4(-))
1 - 6.5VDC (same with the voltage between fan connector 6 (+) and 4(-))
[Values for Vsp are the values that are measured with the fan motor in operation.
Vsp is 0V when the fan motor is stopped.]
Power supply voltage
310 - 340VDC (same with the voltage between fan connector 1 (+) and 4(-))
VDC
Check the fan motor position thermistor signal.
Get the motor to make a full rotation or more, and measure the voltage at the test point
V
FG .
(same with the voltage between fan connector 7 (+) and 4(-))
Replace the indoor control board.
Yes
No Replace the motor.
Are 0VDC and 15VDC
displayed alternately?
19