Mitsubishi OC307C Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

September 2008

No. OC307

REVISED EDITION-C

Series PMFY

Indoor unit
[Model names] [Service Ref.]

PMFY-P20VBM-E PMFY-P20VBM-E

Ceiling Cassettes

PMFY-P20VBM-E1

PMFY-P25VBM-E PMFY-P25VBM-E

PMFY-P20VBM-E#2

PMFY-P25VBM-E1

PMFY-P32VBM-E

PMFY-P40VBM-E PMFY-P40VBM-E

PMFY-P25VBM-E#2
PMFY-P32VBM-E
PMFY-P32VBM-E1

PMFY-P32VBM-E#2

PMFY-P40VBM-E1

PMFY-P40VBM-E#2

R410A

R407C

Revision:

•

PMFY-P20/25/32/40VBM-E#2
are added in REVISED
EDITION-C.

• Some descriptions have
been modified.

• Please void OC307
REVISED EDITION-B.

Note:

• This manual describes only

service data of the indoor
units.

• RoHS compliant products

have <G> mark on the spec
name plate.

• For servicing RoHS compli-

ant products, refer to the
RoHS Parts List.

R22

INDOOR UNIT

CONTENTS

1. TECHNICAL CHANGES

2. SAFETY PRECAUTION

3. PART NAMES AND FUNCTIONS

4. SPECIFICATIONS

5. OUTLINES AND DIMENSIONS

6. WIRING DIAGRAM

7.

REFRIGERANT SYSTEM DIAGRAM

8. TROUBLE SHOOTING

9. DISASSEMBLY PROCEDURE

10. PARTS LIST

11. RoHS PARTS LIST

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......

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.....

.........

2

2
6
8

12

13
16
17
26
29

32

1

PMFY-P20VBM-E1 → PMFY-P20VBM-E#2
PMFY-P25VBM-E
PMFY-P32VBM-E1 → PMFY-P32VBM-E#2
PMFY-P40VBM-E1 → PMFY-P40VBM-E#2

1. CONTROLLER BOARD (I.B) has been changed.

2. PANEL has been changed.
PMP-40BM → PMP-40BMW
(White : 0.98Y 8.99/0.63) (Pure white : 6.4Y 8.9/0.4)

3. FAN MOTOR (MF) has been changed.

4. THERMISTOR (TH22, TH23) have been changed.

PMFY-P20VBM-E → PMFY-P20VBM-E1
PMFY-P25VBM-E → PMFY-P25VBM-E1
PMFY-P32VBM-E → PMFY-P32VBM-E1
PMFY-P40VBM-E → PMFY-P40VBM-E1

1. FAN MOTOR (MF) has been changed.

2. CONTROLLER BOARD (I.B) has been changed.

TECHNICAL CHANGES

1 → PMFY-P25VBM-E#2

2

SAFETY PRECAUTION

CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R407C

Use new refrigerant pipes.

In case of using the existing pipes for R22, be careful with
the followings.

· Change flare nut to the one provided with this product.
Use a newly flared pipe.

· Avoid using thin pipes.

Make sure that the inside and outside of refrige­rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.

Contamination inside refrigerant piping can cause deterio­ration of refrigerant oil etc.

Store the piping to be used during installation
indoors with keep both ends sealed until just
before brazing.
(Store elbows and other joints in a plastic bag.)

Use ESTR , ETHER or HAB as the lubricant to
coat flares and flange connection parts.

If large amount of mineral oil enters, that can cause
deterioration of refrigerant oil etc.

Use liquid refrigerant to seal the system.

If gas refrigerant is used to seal the system, the composition
of the refrigerant in the cylinder will change and performance
may drop.

Do not use a refrigerant other than R407C.

If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the lubricant deterioration.

Use a vacuum pump with a reverse flow check valve.

The vacuum pump oil may flow back into the refrigerant
cycle and cause the lubricant deterioration.

If dust, dirt, or water enters the refrigerant cycle,
deterioration of the oil and compressor trouble may result.

Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

2

[1] Cautions for service

·After recovering all the refrigerant in the unit, proceed to working.

·Do not release refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of
liquid refrigerant.

[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)

Unit

Gravimeter

(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.

[3] Service tools

Use the below service tools as exclusive tools for R407C refrigerant.

No. Tool name Specifications

1 Gauge manifold ·Only for R407C

·Use the existing fitting SPECIFICATIONS. (UNF7/16)

·Use high-tension side pressure of 3.43MPa·G or over.

2 Charge hose ·Only for R407C

·Use pressure performance of 5.10MPa·G or over.

3 Electronic scale

4 Gas leak detector ·Use the detector for R134a or R407C.

5 Adapter for reverse flow check ·Attach on vacuum pump.

6 Refrigerant charge base

7 Refrigerant cylinder ·For R407C ·Top of cylinder (Brown)

·Cylinder with syphon

8 Refrigerant recovery equipment

33

Cautions for units utilizing refrigerant R410A

Use new refrigerant pipes.

In case of using the existing pipes for R22, be careful with
the followings.

· Change flare nut to the one provided with this product.
Use a newly flared pipe.

· Avoid using thin pipes.

Make sure that the inside and outside of refrige­rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.

Contamination inside refrigerant piping can cause deterio­ration of refrigerant oil etc.

Store the piping to be used during installation
indoors and keep 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.

Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.

If large amount of mineral oil enters, that can cause deterio­ration of refrigerant oil etc.

Do not use refrigerant other than R410A.

If other refrigerant (R22 etc.) is used, chlorine in refrige­rant 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.

Tools for R410A
Gauge manifold
Charge hose

Gas leak detector

Torque wrench

Flare tool
Size adjustment gauge
Vacuum pump adaptor

Electronic refrigerant
charging scale

Keep the tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera­nt will change and the efficiency will be lowered.

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.

Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

4

[1] Cautions for service

(1) Perform service after recovering 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.)

Unit

Gravimeter

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

No. Tool name Specifications

1 Gauge manifold ·Only for R410A

·Use the existing fitting

·Use high-tension side pressure of 5.3MPa·G or over.

2 Charge hose ·Only for R410A

·Use pressure performance of 5.09MPa·G or over.

3 Electronic scale

4 Gas leak detector ·Use the detector for R134a, R407C or R410A.

5 Adaptor for reverse flow check ·Attach on vacuum pump.

6 Refrigerant charge base

7 Refrigerant cylinder ·Only for R410A ·Top of cylinder (Pink)

·Cylinder with syphon

8 Refrigerant recovery equipment

specifications

. (UNF1/2)

5

3

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

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

Built-in temperature sensor

PART NAMES AND FUNCTIONS

Indoor Unit

Horizontal Air Outlet

Auto Air Swing Vane

Disperses airflow up and
down and adjusts the angle
of airflow direction.

Guide vane

Air flow can be changed to horizontal
by moving the Guide vane to the left or right.

Filters

Remove dust and pollutants

Returns air from room.

Air intake

from return air.

Wired remote controller

Once the controllers are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

6

Wired remote controller

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 prohib­ited 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.

TIME SUN MON TUE WED THU FRI SAT
TIMER

AFTER

ERROR CODE

°F°C

Hr

AFTER

°F°C

ONLY1Hr.

Up/Down Air Direction indica­tor

The indicator shows the direction
of the outcoming airflow.

“One Hour Only” indicator

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,
when the airflow direction also
changes.

Room Temperature display

Shows the room temperature. The room
temperature display range is 8-39.
The display blinks if the temperature
is less than

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.

ON

OFF

FUNCTION

FILTER

WEEKLY

AUTO OFF

8 or 39

SIMPLE

or more.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons 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 corre­sponding timer is set.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

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.

77

4

SPECIFICATIONS

4-1. SPECIFICATION

Item

Power

Cooling capacity

Heating capacity

Cooling

Input

Heating

Cooling

Current

Electric characteristic

(munsell symbol)

Dimensions

Heating

Exterior

Height

Width

Depth

Heat exchanger

Fan × No

Air flow 3

External

static pressure

F a n

Fan motor

output

Insulator

Air filter

Pipe

dimensions

Gas
side

Liquid

side

Field drain pipe size

Noise level 3

Product weight

Hz

V

·

kW

kW

kW

kW

A

A

—

mm

mm

mm

—

—

G/min

Pa

kW

—

—

:mm(in.)

:mm(in.)

:mm

dB

kg

PMFY-P20VBM-E

PMFY-P20VBM-E

PMFY-P20VBM-E#2

PMFY-P25VBM-E

1

PMFY-P25VBM-E

PMFY-P25VBM-E#2

Single phase 220V-230V-240V 50Hz / 220V 60Hz

2.2

2.5

0.042

0.042

0.20

0.20

2.8

3.2

0.044

0.044

0.21

0.21

Unit : Galvanized sheets · Standard grilles : ABS resin acrylic coating

Munsell <0.98Y 8.99/0.63> (PMFY-P·VBM-E

8.7-8.0-7.2-6.5

PP honey comb fabric

O.D.26 (PVC pipe VP-20 connectable)

35-33-30-27

230<30>

812<1,000>

395<470>

Cross fin

Line flow fan × 1

9.3-8.6-8.0-7.3

Polyethylene sheet

12.7(1/2")

6.35(1/4")

37-36-34-32

PMFY-P32VBM-E

PMFY-P32VBM-E

1

PMFY-P32VBM-E#2

(1)) / <6.4Y 8.9/0.4> (PMFY-P·VBM-E#2)

0

0.028

14<3.0>

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
Note 2. The number indicated in < > is for the grille.
W 3. Air flow and the noise level are indicated as High – Middium1 – Middium2 – Low.

3.6

4.0

0.044

0.044

0.21

0.21

PMFY-P40VBM-E

1

PMFY-P40VBM-E

PMFY-P40VBM-E#2

10.7-9.7-8.7-7.7

39-37-35-33

1

4.5

5.0

0.054

0.054

0.26

0.26

8

4-2. ELECTRIC PARTS SPECIFICATIONS

Service ref.

Parts name

Room temperature
thermistor

Liquid pipe thermistor

Gas pipe thermistor

Fuse
(Indoor controller board)

Fan motor

Vane motor

Drain-up mechanism

Symbol

TH21

TH22

TH23

FUSE

MF

MV

DP

PMFY-P20VBM-E

PMFY-P20VBM-E

PMFY-P20VBM-E#2

Resistance 0/15k, 10/9.6k, 20/6.3k, 25/5.4k, 30/4.3k, 40/3.0k

Resistance 0/15k, 10/9.6k, 20/6.3k, 25/5.4k, 30/4.3k, 40/3.0k

Resistance 0/15k, 10/9.6k, 20/6.3k, 25/5.4k, 30/4.3k, 40/3.0k

PMFY-P25VBM-E

1

PMFY-P25VBM-E1

PMFY-P25VBM-E#2

250V 6.3A

DC Brushless Motor

8-pole OUTPUT 28W

PN0H28-MB

MSFJC 20M23

220-240V 50/60Hz

PMFY-P32VBM-E

PMFY-P32VBM-E1

PMFY-P32VBM-E#2

12V/380

PJV-1046



PMFY-P40VBM-E

PMFY-P40VBM-E1

PMFY-P40VBM-E#2

Drain sensor

Linear expansion valve

Power supply
terminal block

Transmission
terminal block

MA-remote controller
terminal block

DS

LEV

TB2

TB5

TB15

Thermistor resistance 0/6k, 10/3.9k, 20/2.6k, 25/2.2k, 30/1.8k, 40/1.3k

DC12V Stepping motor drive, Port dimension :3.2

(0~2000pulse)

(L, N, ) 330V 30A

(M1, M2, S) 250V 20A

(1,2) 250V 10A

99

4-3. AIR CAPACITY TAKEN FROM OUTSIDE

n

PMFY-P·VBM-A series enables to take fresh air from outside. When taking fresh air, the duct fan is used.
The air capacity should be 20% or less of the air flow SPEC(Hi).

250 288.5

108

90

W

122

100

W

Unit : mm

4-W2.8

Fresh air intake hole

(Knockout)

Service Ref.

Air flow

(Hi)

PMFY-P20VBM-E
PMFY-P20VBM-E
PMFY-P20VBM-E#2

1

8.7m3/min

PMFY-P25VBM-E
PMFY-P25VBM-E
PMFY-P25VBM-E#2

1

9.3m3/min

PMFY-P32VBM-E
PMFY-P32VBM-E
PMFY-P32VBM-E#2

1

9.3m3/min

PMFY-P40VBM-E
PMFY-P40VBM-E
PMFY-P40VBM-E#2

1

10.7m3/min

Operation in conjunction with duct fan (Booster fan)

Whenever the indoor unit is operating, the duct fun

operates.
(1)Connect the optional multiple remote controller

adapter(PAC-SA88HA-E) to the connector CN51 on
the indoor controller board.

(2)Drive the relay after connecting the 12V DC relay

between the Yellow and Orange connector lines.
(w)Use a relay of 1W or smaller.
MB: Electromagnetic switch power relay for duct fan.

X: Auxiliary relay (12V DC LY-1F)

Fresh air intake hole

(Knockout)

Air capacity from outside

Max 1.74m3/min

Max 1.86m3/min

Max 1.86m3/min

Max 2.14m3/min

Green

CN51
on
indoor unit
board

5

1

Connector (5P)

Indoor unit side

Multiple remote
controller adapter
PAC-SA88HA-E

Indoor controller board

Be sure to secure insulation
material by tape, etc.

Yellow

Orange

Red

Brown

~

MB

Installation at site

Be sure to secure insulatio
material by tape, etc.

Distance between indoor
controller board and relay
must be within 10m.

How to read curves

Q

Duct characteristics
at site

A

B

A

EC

AD



0





Q

Qa

Curve in the
right graphs

Q

Multiple remote
controller adapter
PAC-SA88HA-E

Q…Designed amount of fresh air intake

A…Static pressure loss of fresh air

C

intake duct system with air flow
amount Q <Pa>

B…Forced static pressure at air condi-

tioner inlet with air flow amount Q

C…Static pressure of booster fan with

air flow amount Q <Pa>

D…Static pressure loss increase amount

of fresh air intake duct system for air
flow amount Q <Pa>

E…Static pressure of indoor unit with air

flow amount Q <Pa>

Qa…Estimated amount of fresh air

intake without D <m3/min>

<m3/min>

<Pa>

50.0

0.0

-50.0

Static pressure (Pa)

-100.0

0.0 0.5 1.0

Characteristic diagram of fresh air taken capacity

Air flow (m

3

/min)

CN51

2 intakes

1 intake

1.5 2.0 2.5

10

4-4. NOISE CRITERION CURVES

PMFY-P20VBM-E
PMFY-P20VBM-E1
PMFY-P20VBM-E#2

90

NOTCH

High
Medium1
Medium2

Low

SPL(dB)

35
33
30
27

LINE

PMFY-P25VBM-E
PMFY-P32VBM-E
PMFY-P25VBM-E

1

PMFY-P32VBM-E1
PMFY-P25VBM-E#2
PMFY-P32VBM-E#2

90

NOTCH

High
Medium1
Medium2

Low

SPL(dB)

37
36
34
32

LINE

80

70

60

50

40

30

20

APPROXIMATE THRESHOLD OF HEARING
FOR CONTINUOUS NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

PMFY-P40VBM-E
PMFY-P40VBM-E1
PMFY-P40VBM-E#2

90

NOTCH

High
Medium1
Medium2

Low

SPL(dB)

39
37
35
33

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

LINE

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)

NOISE

10

CEILING

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

UNIT

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

11

1.5m

MICROPHONE