Mitsubishi PEFY-P08NMSU-E, PEFY-P18NMSU-E, PEFY-P06NMSU-E, PEFY-P12NMSU-E, PEFY-P15NMSU-E Technical & Service Manual

Air-Conditioners

TECHNICAL & SERVICE MANUAL

Models

PEFY-P06NMSU-E, PEFY-P08NMSU-E
PEFY-P12NMSU-E, PEFY-P15NMSU-E
PEFY-P18NMSU-E, PEFY-P24NMSU-E

For use with R410A & R22

2008

ii

HWE08010 GB

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 leak­age, 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 in­jury.

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 electri­cian 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.

ii

HWE08010 GB

Precautions for handling units for use with R410A

WARNING

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 infil­trate and pose a risk of electric shock, smoke, or fire.

Only use the type of refrigerant that is indicated on the unit
when installing or relocating the unit.

Infiltration of any other types of refrigerant or air into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.

When installing the unit in a small space, take appropriate
precautions to prevent leaked refrigerant from reaching the
limiting concentration.

Leaked refrigerant gas will displace oxygen and may cause
oxygen starvation. Consult your dealer before installing the
unit.

Consult your dealer or a qualified technician when moving
or reinstalling the unit.

Improper installation may result in water leakage, electric
shock, or fire.

After completing the service work, check for a refrigerant
leak.

If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, toxic gases will be gener­ated.

Do not try to defeat the safety features of the unit.

Forced operation of the pressure switch or the temperature
switch by defeating the safety features for these devices, or
the use of accessories other than the ones that are recom­mended by Mitsubishi Electric may result in smoke, fire, or
explosion.

Consult your dealer for proper disposal method.

Do not use a leak detection additive.

CAUTION

Do not use the existing refrigerant piping.

A large amount of chlorine that may be contained in the re­sidual refrigerant and refrigerator oil in the existing piping
may cause the refrigerator oil in the new unit to deteriorate.

Use refrigerant piping materials made of phosphorus deox­idized copper. Keep the inner and outer surfaces of the
pipes clean and free of such contaminants as sulfur, oxides,
dust, dirt, shaving particles, oil, and moisture.

Contaminants in the refrigerant piping may cause the refrig­erator oil to deteriorate.

Store the piping materials indoors, and keep both ends of
the pipes sealed until immediately before brazing. (Keep el­bows and other joints wrapped in plastic.)

Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerator 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 flanges.

Infiltration of a large amount of mineral oil may cause the re­frigerator oil to deteriorate.

Charge the system with refrigerant in the liquid phase.

If gaseous refrigerant is drawn out of the cylinder first, the
composition of the remaining refrigerant in the cylinder will
change and become unsuitable for use.

Only use R410A.

The use of other types of refrigerant that contain chloride
may cause the refrigerator oil to deteriorate.

Use a vacuum 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 refrigerant cy­cle and cause the refrigerator oil to deteriorate.

Prepare tools for exclusive use with R 410A. Do not use the
following tools if they have been used with the conventional
refrigerant: gauge manifold, charging hose, gas leak detec­tor, check valve, refrigerant charge base, vacuum gauge,
and refrigerant recovery equipment.

If the refrigerant or the refrigerator oil that may be left on these
tools are mixed in with R410A, it may cause the refrigerator oil
in the new system to deteriorate.
Infiltration of water may cause the refrigerator oil to deteriorate.
Leak detectors for conventional refrigerants will not detect an
R410A leak because R410A is free of chlorine.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of the refrigerant
in the cylinder will change and become unsuitable for use.

Exercise special care when handling tools for use with R410A.

Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerator oil to deteriorate.

iiiiii

HWE08010 GB

Precautions for PAC-YU25HT (Optional parts)

WARNING

Stop the operation if any malfunction occurs.

If malfunction occurs (burning smell, etc.) stop the opera­tion and turn off the power supply. Contact your dealer or
technical representative. If the controller continues to oper­ate after a malfunction occurs, this may cause damage,
electric shock or fire.

Do not turn on the main power until installation has been
completed.

Doing so may result in electric shock or fire.

Leave sufficient space between heater and indoor unit to al­low for air movement to prevent the indoor unit from over­heating.

If they are installed too closely and the indoor unit temper­ature exceeds 40°C, malfunctions or fire may result.

Keep the heater clean to keep the indoor unit from sucking
in accumulated dust on the heater.

Dust particles that enter the indoor unit may cause fire.

When air conditioner and heater are configured to perform
an interlocked operation, do not use any other type of ca­bles except this external heater adapter (PAC-YU25HT).

The use of any other type of cables may result in malfunc­tions or fire.

Do not build a heater into the indoor unit.

Doing so may result in fire.

CAUTION

Do not install in any place exposed to flammable gas leak­age.

Flammable gases accumulated around the body of PAC­YU25HT may cause an explosion.

Do not use in any special environment.

Using in any place exposed to oil (including machine oil),
steam and sulfuric gas may deteriorate the performance
significantly or give damage to the component parts.

Do not install in any place where acidic or alkaline solution
or special spray are often used.

Doing so may cause an electric shock or malfunction.

Do not install in any steamy place such a bathroom or kitch­en.

Avoid any place where moisture is condensed into dew.Do­ing so may cause an electric shock or malfunction.

Do not wash with water.

Doing so may cause an electric shock or malfunction.

Do not install in any place at a temperature of more than
40°C (104°F) or less than 0°C (32°F) or exposed to direct
sunlight.

iv

HWE08010 GB

CONTENTS

HWE08010 GB

I

Features

[1] Features.................................................................................................................................... 1

II

Components and Functions

[1] Components and Functions...................................................................................................... 2

III

Specfications

[1] Specifications............................................................................................................................ 4

1.Specfications .......................................................................................................................... 4

2.Electrical component specifications........................................................................................ 6

IV

Outlines and Dimensions

[1] Outlines and Dimensions.......................................................................................................... 7

V

Wiring Diagram

[1] Wiring Diagram......................................................................................................................... 8

VI

Refrigerant System Diagram

[1] Refrigerant system diagram...................................................................................................... 9

VII

Microprocessor Control

[1] Microprocessor Control........................................................................................................... 10

1.Cool operation ...................................................................................................................... 10

2.Dry operation ........................................................................................................................ 11

3.Fan operation........................................................................................................................ 12

4.Heat operation ...................................................................................................................... 13

5.Auto operation [Automatic cool / heat change over operation] ............................................. 14

6.When unit is stopped control mode ...................................................................................... 15

7.Heater control ....................................................................................................................... 15

VIII

Troubleshooting

[1] Troubleshooting ...................................................................................................................... 19

1.Check methods..................................................................................................................... 19

2.DC fan motor (fan motor/indoor control board)..................................................................... 23

3.Address switch setting .......................................................................................................... 24

4.Voltage test points on the control board ............................................................................... 25

5.Dipswitch setting (Factory setting)........................................................................................ 26

IX

Disassembly Procedure

[1] Disassembly Procedure.......................................................................................................... 29

1.Control box ........................................................................................................................... 29

2.Thermistor (Intake air) .......................................................................................................... 30

3.Drainpan ............................................................................................................................... 31

4.Thermistor (Gas pipe) (Liquid pipe) ...................................................................................... 32

5.Fan and fan motor ................................................................................................................ 33

6.Bearing ................................................................................................................................. 34

7.Heat exchanger .................................................................................................................... 35

HWE08010 GB

[ I Features ]

- 1 -

HWE08010 GB

IFeat ures

[1] Features

Model Cooling capacity/Heating capacity

BTU/h kW

PEFY-P06NMSU-E 6000/6700 1.8/2.0

PEFY-P08NMSU-E 8000/9000 2.3/2.6

PEFY-P12NMSU-E 12000/13500 3.5/4.0

PEFY-P15NMSU-E 15000/17000 4.4/5.0

PEFY-P18NMSU-E 18000/20000 5.3/5.9

PEFY-P24NMSU-E 24000/27000 7.0/7.9

[ II Components and Functions ]

- 2 -

HWE08010 GB

IIComponen ts and Functions

[1] Components and Functions

1. Indoor (Main) Unit

2. Remote Controller
[PAR-21MAA]

Once the operation mode is selected, the unit will remain in the selected mode until changed.

(1) Remote Controller Buttons

Keep the remote controller out of direct sunlight to ensure accurate measurement of room temperature.
The thermistor at the lower right-hand section of the remote controller must be free from obstructions to ensure accurate mea-

surement of room temperature.

(A) Air

1 [Set Temperature] Button 7 [Vane Control] Button
2 [Timer Menu] Button 8 [Ventilation] Button

[Monitor/Set] Button [Operation] Button

3 [Mode] Button 9 [Check/Clear] Button

[Back] Button 10 [Test Run] Button

4 [Timer On/Off] Button 11 [Filter] Button

[Set Day] Button [ ] Button

5 [Louver] Button 12 [ON/OFF] Button

[Operation] Button 13 Position of built-in room thermistor

6 [Fan Speed] Button 14 [Set Time] Button

(A)

(A)

[ II Components and Functions ]

- 3 -

HWE08010 GB

(2) Remote Controller Display

A Current time/Timer time I Louver swing

B Centralized control indicator J Ventilation

C Timer OFF indicator K Filter sign

D Timer mode L Sensor position

E Operation mode display: COOL, DRY, AUTO,

FAN, HEAT

M Room temperature

F Function Lock indicator N Vane setting

G Preset temperature O Fan speed

H Power indicator

[ III Specfications ]

- 4 -

HWE08010 GB

III Specfications

[1] Specifications

1. Specfications

Model PEFY-P06NMSU-E PEFY-P08NMSU-E PEFY-P12NMSU-E PEFY-P15NMSU-E

Power source 1-phase 208/230V 60Hz
Cooling capacity *1 BTU / h 6,000 8,000 12,000 15,000
(Nominal) *1 kW 1.8 2.3 3.5 4.4

Power input kW 0.05/0.05 0.06/0.06 0.07/0.07 0.07/0.07

Current input A 0.42/0.41 0.51/0.49 0.56/0.53 0.57/0.55
Heating capacity *2 BTU / h 6,700 9,000 13,500 17,000
(Nominal) *2 kW 2.0 2.6 4.0 5.0

Power input kW 0.03/0.03 0.04/0.04 0.05/0.05 0.05/0.05

Current input A 0.32/0.31 0.41/0.39 0.46/0.43 0.47/0.45
External finish Galvanized
External dimension H x W x D in. 7-7/8 x 31-1/8 x 27-9/16 7-7/8 x 31-1/8 x 27-9/16 7-7/8 x 31-1/8 x 27-9/16 7-7/8 x 39 x 27-9/16

mm 200 x 790 x 700 200 x 790 x 700 200 x 790 x 700 200 x 990 x 700
Net weight lbs (kg) 42(19) 42(19) 46(20) 54(24)
Heat exchanger Cross fin(Aluminium fin and copper tube)
FAN Type x Quantity Sirocco fan x 2 Sirocco fan x 2 Sirocco fan x 2 Sirocco fan x 3

External in.WG

0.02-0.06-0.14-0.20
(208V)

0.02-0.06-0.14-0.20
(208V)

0.02-0.06-0.14-0.20
(208V)

0.02-0.06-0.14-0.20
(208V)

static press Pa 5-15-35-50 5-15-35-50 5-15-35-50 5-15-35-50

in.WG

0.02-0.06-0.14-0.20
(230V)

0.02-0.06-0.14-

0.20(230V)

0.02-0.06-0.14-

0.20(230V)

0.02-0.06-0.14-

0.20(230V)

Pa 5-15-35-50 5-15-35-50 5-15-35-50 5-15-35-50
Motor type DC brushless motor
Motor output kW 0.096 0.096 0.096 0.096
Driving mechanism Direct-driven
Airflow rate cfm 176-212-247 194-247-317 211-282-370 282-335-388
(Low-Mid-High) m3 / min 5-6-7 5.5-7-9 6-8-10.5 8-9.5-11

L / s 83-100-117 91-116-150 100-133-175 133-158-183

Sound pressure level dB <A> 22-24-28 (208V) 23-26-30 (208V) 23-28-35 (208V) 28-30-33 (208V)
(Low-Mid-High) dB <A> 22-24-28 (230V) 23-26-30 (230V) 23-28-35 (230V) 28-30-33 (230V)
(measured in anechoic room) dB <A> - - - ­Insulation material Polystyrene foam,Polyethylene foam,Urethane foam
Air filter PP Honeycomb fabric (washable)
Protection device Fuse
Refrigerant control device LEV

Connectable outdoor unit *3

R410A,R22 CITY

MULTI

R410A,R22 CITY

MULTI

R410A,R22 CITY

MULTI

Diameter of Liquid (R410A)

in. (mm)

1/4 (6.35) Brazed 1/4 (6.35) Brazed 1/4 (6.35) Brazed 1/4 (6.35) Brazed
refrigerant (R22 ) 1/4 (6.35) Brazed 1/4 (6.35) Brazed 1/4 (6.35) Brazed 1/4 (6.35) Brazed
pipe Gas (R410A)

in. (mm)

1/2 (12.7) Brazed 1/2 (12.7) Brazed 1/2 (12.7) Brazed 1/2 (12.7) Brazed
(O.D.) (R22 ) 1/2 (12.7) Brazed 1/2 (12.7) Brazed 1/2 (12.7) Brazed 1/2 (12.7) Brazed
Diameter of drain pipe in. (mm) O.D. 1-1/4(32) O.D. 1-1/4(32) O.D. 1-1/4(32) O.D. 1-1/4(32)
Drawing External WKB94L522

Wiring WKB94L523

Refrigerant cycle ­Standard Document Installation Manual, Instruction Book
attachment Accessory Drain hose (flexible joint)
Optional External heater adaptor PAC-YU25HT PAC-YU25HT PAC-YU25HT PAC-YU25HT
parts
Remark

Installation Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other

items shall be referred to the Installation Manual.

Note : *1 Nominal cooling conditions *2 Nominal heating conditions Unit convertor

Indoor : 80degF D.B. / 67degF W.B. 70degF D.B. kcal/h = kW x 860

(26.7degC D.B. / 19.4degC W.B.) (21.1degC D.B.) BTU/h = kW x 3,412

Outdoor : 95degF D.B. 47degF D.B. / 43degF W.B. cfm = m3/min x 35.31

(35degC D.B.) (8.3degC D.B. / 6.1degC W.B.) lbs = kg / 0.4536

Pipe length : 25 ft. (7.6 m) 25 ft. (7.6 m)

Level difference : 0 ft. (0 m) 0 ft. (0 m) *Above specification data is
*3 PUHY-THMU,PURY-THMU,PUHY-YHMU,PURY-YHMU,PUMY-NHMU subject to rounding variation.
*The external static pressure is set to 15 Pa at factory shipment.
*Due to continuing improvement, above specification may be subject to change without notice.

[ III Specfications ]

- 5 -

HWE08010 GB

Model PEFY-P18NMSU-E PEFY-P24NMSU-E

Power source 1-phase 208/230V 60Hz
Cooling capacity *1 BTU / h 18,000 24,000
(Nominal) *1 kW 5.3 7.0

Power input kW 0.09/0.09 0.12/0.12

Current input A 0.74/0.70 0.98/0.93
Heating capacity *2 BTU / h 20,000 27,000
(Nominal) *2 kW 5.9 7.9

Power input kW 0.07/0.07 0.10/0.10

Current input A 0.64/0.60 0.88/0.83
External finish Galvanized
External dimension H x W x D in. 7-7/8 x 39 x 27-9/16 7-7/8 x 46-7/8 x 27-9/16

mm 200 x 990 x 700 200 x 1190 x 700
Net weight lbs (kg) 54(24) 62(28)
Heat exchanger Cross fin(Aluminium fin and copper tube)
FAN Type x Quantity Sirocco fan x 3 Sirocco fan x 4

External in.WG

0.02-0.06-0.14-0.20
(208V)

0.02-0.06-0.14-0.20
(208V)

static press Pa 5-15-35-50 5-15-35-50

in.WG

0.02-0.06-0.14-0.20
(230V)

0.02-0.06-0.14-

0.20(230V)

Pa 5-15-35-50 5-15-35-50
Motor type DC brushless motor
Motor output kW 0.096 0.096
Driving mechanism Direct-driven
Airflow rate cfm 353-441-529 423-565-706
(Low-Mid-High) m3 / min 10-12.5-15 12-16-20

L / s 167-208-250 200-267-333

Sound pressure level dB <A> 30-34-37 (208V) 30-35-40 (208V)
(Low-Mid-High) dB <A> 30-34-37 (230V) 30-35-40 (230V)
(measured in anechoic room) dB <A> - ­Insulation material Polystyrene foam,Polyethylene foam,Urethane foam
Air filter PP Honeycomb fabric (washable)
Protection device Fuse
Refrigerant control device LEV

Connectable outdoor unit

R410A,R22 CITY

MULTI

R410A,R22 CITY

MULTI

Diameter of Liquid (R410A)

in. (mm)

1/4 (6.35) Brazed 3/8 (9.52) Brazed
refrigerant (R22 ) 3/8 (9.52) Brazed 3/8 (9.52) Brazed
pipe Gas (R410A)

in. (mm)

1/2 (12.7) Brazed 5/8 (15.88) Brazed
(O.D.) (R22 ) 5/8 (15.88) Brazed 5/8 (15.88) Brazed
Diameter of drain pipe in. (mm) O.D. 1-1/4(32) O.D. 1-1/4(32)
Drawing External WKB94L522

Wiring WKB94L523

Refrigerant cycle ­Standard Document Installation Manual, Instruction Book
attachment Accessory Drain hose (flexible joint)
Optional External heater adaptor PAC-YU25HT PAC-YU25HT
parts
Remark

Installation Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other

items shall be referred to the Installation Manual.

Note : *1 Nominal cooling conditions *2 Nominal heating conditions Unit convertor

Indoor : 80degF D.B. / 67degF W.B. 70degF D.B. kcal/h = kW x 860

(26.7degC D.B. / 19.4degC W.B.) (21.1degC D.B.) BTU/h = kW x 3,412

Outdoor : 95degF D.B. 47degF D.B. / 43degF W.B. cfm = m3/min x 35.31

(35degC D.B.) (8.3degC D.B. / 6.1degC W.B.) lbs = kg / 0.4536

Pipe length : 25 ft. (7.6 m) 25 ft. (7.6 m)

Level difference : 0 ft. (0 m) 0 ft. (0 m) *Above specification data is
*The external static pressure is set to 15 Pa at factory shipment. subject to rounding variation.
*Due to continuing improvement, above specification may be subject to change without notice.

[ III Specfications ]

- 6 -

HWE08010 GB

2. Electrical component specifications

Component Sym-

bol

PEFY-P06NMSU-E PEFY-P08NMSU-E PEFY-P12NMSU-E

Room temperature
thermistor

TH21 Resistance 0°C[32°F]/15k , 10°C[50°F]/9.6k , 20°C[68°F]/6.3k , 25°C[77°F]/5.4k ,

30°C[86°F]/4.3k , 40°C[104°F]/3.0k

Liquid pipe thermistor TH22 Resistance 0°C[32°F]/15k , 10°C[50°F]/9.6k , 20°C[68°F]/6.3k , 25°C[77°F]/5.4k ,

30°C[86°F]/4.3k , 40°C[104°F]/3.0k

Gas pipe thermistor TH23 Resistance 0°C[32°F]/15k , 10°C[50°F]/9.6k , 20°C[68°F]/6.3k , 25°C[77°F]/5.4k ,

30°C[86°F]/4.3k , 40°C[104°F]/3.0k

Fuse FUSE 250V 6.3A

Fan motor 8-pole, Output 96W SIC-70CW-D8114-1

Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3.2 (0~2000 pulse)

Power supply terminal
block

TB2

(L1, L2, G) 330V 30A

Transmission terminal
block

TB5

TB15

(1, 2), (M1, M2, S) 250V 20A

Drain float switch DS Open/short detection

Initial contact resistance 500 m or less

Component Sym-

bol

PEFY-P15NMSU-E PEFY-P18NMSU-E PEFY-P24NMSU-E

Room temperature
thermistor

TH21 Resistance 0°C[32°F]/15k , 10°C[50°F]/9.6k , 20°C[68°F]/6.3k , 25°C[77°F]/5.4k ,

30°C[86°F]/4.3k , 40°C[104°F]/3.0k

Liquid pipe thermistor TH22 Resistance 0°C[32°F]/15k , 10°C[50°F]/9.6k , 20°C[68°F]/6.3k , 25°C[77°F]/5.4k ,

30°C[86°F]/4.3k , 40°C[104°F]/3.0k

Gas pipe thermistor TH23 Resistance 0°C[32°F]/15k , 10°C[50°F]/9.6k , 20°C[68°F]/6.3k , 25°C[77°F]/5.4k ,

30°C[86°F]/4.3k , 40°C[104°F]/3.0k

Fuse FUSE 250V 6.3A

Fan motor 8-pole, Output 96W SIC-70CW-D896-2

Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3.2 (0~2000 pulse)

Power supply terminal
block

TB2

(L1, L2, G) 330V 30A

Transmission terminal
block

TB5

TB15

(1, 2), (M1, M2, S) 250V 20A

Drain float switch DS Open/short detection

Initial contact resistance 500 m or less