Mitsubishi PMFY-P20VBM, PMFY-P25VBM, PMFY-P32VBM, PMFY-P40VBM SERVICE MANUAL

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

2000

No. OC220

Series PMFY

Indoor unit
[Model names] [Service Ref.]

PMFY-P20VBM PMFY-P20VBM
PMFY-P25VBM PMFY-P25VBM
PMFY-P32VBM PMFY-P32VBM
PMFY-P40VBM PMFY-P40VBM

Ceiling Cassettes

R407C

R22

CONTENTS

1. SAFETY PRECAUTION ·······················2

2. PART NAMES AND FUNCTIONS········4

3. SPECIFICATION···································6

4. OUTLINES AND DIMENSIONS··········10

5. WIRING DIAGRAM·····························11

6.

REFRIGERANT SYSTEM DIAGRAM

7. TROUBLE SHOOTING ·······················13

8. DISASSEMBLY PROCEDURE ···········19

9. PARTS LIST········································22

···12

INDOOR UNIT

1

SAFETY PRECAUTION

Cautions for devices that use R407C refrigerant.

· Do not use the existing refrigerant piping.

-The old refrigerant and refrigerator oil in the existing piping contains a large amount of chlorine which may cause the refrig­erator oil of the new unit to deteriorate.

· Use “low residual oil piping”.

-If there is a large amount of residual oil (hydraulic oil, etc.) inside the piping and joints, deterioration of the refrigerator oil
will result.

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

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

· Use Suniso 4GS or 3GS (small amount) as the refrigerator oil to coat flares and flange connection parts.

-The refrigerator oil used with the air conditioner is highly hygroscopic. If it is used, water may be mixed in and deterioration

of the refrigerator oil may result.

· Use liquid refrigerant to seal the system.

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

may drop.

· Do not use a refrigerant other than R407.

-If another refrigerant (R22, etc.) is used, the chlorine in the refrigerant may cause the refrigerator oil to deteriorate.

· Use a vacuum pump with a reverse flow check valve.

-The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerator oil to deteriorate.

2

[1] Service tools

Gravimeter

Unit

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 35kgf/cm

2 Charge hose ·Only for R407C.

·Use pressure performance of 52kgf/cm

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.

[2] Notice on repair service

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

·Do not release the refrigerant in the air.

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

2

2

or over.

or over.

[3] Refrigerant recharging

(1) Refrigerant recharging process

1Direct enclosure from the bomb.

·Confirm that R407C bomb on the market are syphon pipe.

·Leave the syphon pipe bomb raising and recharge it.
(By liquid refrigerant)

(2) Recharge in refrigerant leakage case

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

·Do not release the refrigerant in the air.

·After complete the repair service, recharge the cycle with the specified amount of the

liquid refrigerant.

3

2

Press this button to switch the cooler
electronic dry (dehumidify) automatic
and heater modes.

OPERATION SWITCH button

This sets the room temperature the
temperature setting can be performed
in 1: units
Setting range
Cooler 19: to 30:
Heater 17: to 28:

TEMP. ADJUSTMENT button

This switches between continuous
operation and the timer operation.

TIMER button

This switches between the operation
and stop modes each time it is pressed.
The lamp on this button lights during
operation.

ON/OFF button

Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.

CHECK-TEST RUN button

This switch the horizontal fan motion
NO and OFF.

(This button does not operate in this
model)

LOUVER button

This adjusts the vertical angle of the
ventilation.

AIR DIRECTION button

This resets the filter service indication
display

FILTER button

This sets of switches the current time,
start time and stop time.

TIME SETTING button

This sets the ventilation fan speed.

AIR SPEED button

PART NAMES AND FUNCTIONS

● Indoor (Main) 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 horinzontally
by moving the Guide vane to the left or right.

Filters

Remove dust and pollutants
from inhaled air.

● Remote controller

● Operation buttons

Air intake

Inhales air from room.

[PAR-F25MA]

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

4

5

● Display

CENTRALLY
CONTROLLED display

This indicates when the unit is con-

trolled by optional features such as
central control type remote controller.

TIMER display

This indicates when the continuous

operation and time operation modes
are set.

It also display the time for the timer

operation at the same time as when
it is set.

OPERATION MODE display

This indicates the operation mode.

STANDBY display

This indicates when the standby

mode is set from the time the sleep
operation starts until the heating air
is discharged.

CLOCK display

The current time , start time and stop
time can be displayed in ten second
intervals by pressing the time switch
button. The start time or stop time is
always displayed during the timer
operation.

In this display example on the bot­tom left, a condition where all dis­play lamps light is shown for expla­nation purposes although this differs
from actual operation.

AIR DIRECTION display

The selected fan speed is displayed.

FAN SPEED display

This displays the air direction.

ROOM TEMPERATURE display

The temperature of the suction air is
displayed during operation. The dis­play range is 8° to 39°C. The display
flashes 8°C when the actual temper­ature is less than 8° and flashes
39°C when the actual temperature is
greater than 39°C.

Operation lamp

This lamp lights during operation,
goes off when the unit stops and
flashes when a malfunction occurs.

DEFROST display

This indicates when the defrost oper-

ation is performed.

CHECK MODE

TEST RUN

This display lights in the check mode
or when a test operation is per­formed.

display

FILTER display

CHECK display

This indicates when a malfunction

has occurred in the unit which should
be checked.

SET TEMPERATURE display

This displays the selected setting

temperature.

Caution

● Only the Power display lights when the unit is stopped and power supplied to the unit.

● When the central control remote control unit, which is sold separately, is used the ON-OFF button, operation switch button

and TEMP. adjustment button do not operate.

● “NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped
with the fan direction adjustment function and the louver function.

● When power is turned ON for the first time, it is normal that “H0” is displayed on the room temperature indication (For max.
2minutes). Please wait until this “H0” indication disappear then start the operation.

POWER display

This lamp lights when electricity is
supplied to the unit.

This lamp lights when the filter need
to be cleaned.

5

3

Item

V

·Hz

kcal/h

kW

Btu/h

kcal/h

kW

Btu/h

kW
kW

A

A
%
%

mm
mm
mm

k/min

Pa

kW

[mm
[mm
[mm

dB

kg

Cooling capacity

Power

Heat exchanger

Insulator

Air filter

Fan ✕ No

Air flow #3

Pipe

dimensions

Unit drain pipe size
Noise level #3
Product weight

Exterior

(munsell symbol)

Fan motor

output

External

static pressure

Liquid

side

Gas
side

Heating capacity

F

a

n

Dimensions

Height

Width

Depth

Electric characteristic

Input

Cooling
Heating
Cooling
Heating
Cooling
Heating

Current

Power

factor

PMFY-P20VBM PMFY-P25VBM PMFY-P32VBM PMFY-P40VBM

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

2,000

2.3
7,900
2,250

2.6
8,900

0.042

0.042

0.20

0.20
95—88
95—88

2,500

2.9
9,900
2,800

3.3

11,100

0.044

0.044

0.21

0.21
95—87
95—87

3,150

3.7

12,500

3,550

4.1

14,100

0.044

0.044

0.21

0.21
95—87
95—87

4,000

4.7

15,900

4,500

5.2

17,900

0.054

0.054

0.26

0.26
94—87
94—87

9.3-8.6-8.0-7.3

37-36-34-32

8.7-8.0-7.2-6.5

35-33-30-27

10.7-9.7-8.7-7.7

39-37-35-33

-Unit : Galvanized sheets · Standard grills : ABS resin acrylic coating Munsell<0.98Y 8.99/0.63>
230<30>

854<1,000>

395<470>

Cross fin

Line flow fan ✕ 1

0

0.028

Polyethylene sheet

PP honeycomb fabric

12.7(1/2")

6.35(1/4")

O.D.25 (PVC pipe VP-20 connectable)

14<3.0>

SPECIFICATION

3-1. Specification

Note 1. Rating conditions

Note 2. The number indicated in < > is just for the grille.
Note 3. Air flow and the noise level are indicated as High-Middium 1-Middium 2-Low.

Cooling: Indoor: D.B. 27°C W.B. 19.5°C
Heating: Indoor: D.B. 21°C

outdoor: D.B. 35°C
outdoor: D.B. 7°C W.B. 6°C

6

3-2. Air capacity taken from outside

50.0

-50.0

-100.0

0.0 0.5 1.0
Air flow (m

3

/min)

2 intakes

1 intake

Characteristic diagram of air capacity taken from outside of PMFY-P·VBM

Static pressure (Pa)

1.5 2.0 2.5

0.0

PMFY-P20VBM
PMFY-P25VBM
PMFY-P32VBM
PMFY-P40VBM

8.7m3/min

9.3m3/min

9.3m3/min

10.7m3/min

Max 1.74m3/min
Max 1.86m3/min
Max 1.86m3/min
Max 2.14m3/min

Air flow

(Hi)

Air capacity taken outside

(Knock out)

4-{2.8

Flesh air intake hole

(Knock out)

Flesh air intake hole

90-

{

122

{

100

108

250 288.5

CN51

Multiple remote
controller adapter
PAC-SA88HA-E

Indoor controller board

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

Be sure to secure insulation
material by tape and such

5

Green

Yellow

Orange

Connector (5P)

Package side

Multiplr remote
controller adapter
PAC-SA88HA-E

Be sure to secure insulation
material by tape and such

Installation at site

CN51
on
indoor unit
board

Red

Brown

1

MB

~

Q

0

B

A

C

1

2

3

Curve in the
left praphs.

Duct characteristics
at site

Q

A

E C

Q

Qa

A D

PMFY-P·VBM series are possible to be taken air from outside.
When taking air from the outside, the duct fan can be used to.
The air capacity should be 20% or less of the air flow SPEC(Hi).

Interlocking operation method with duct fan

(Booster fan)

●Whenever the indoor unit is operating, the duct fun also
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 under 1W.
MB: Electromagnetic switch power relay for duct fan.

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

How to read curves

Q…Planned amount of fresh air intake
A…Static pressure loss of fresh air

intake duct system with air flow
amount Q

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

D…Static pressure loss increase

amount of fresh air intake dust
system for air flow amount Q

E…Static pressure of indoor unit with

air flow amount Q

Qa…Estimated amount of fresh air

intake with out D <m3/min>

3

<m

/min>

<mmAq>

<mmAq>
<mmAq>

<mmAq>
<mmAq>

7

3-3. NOISE CRITERION CURVES

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROTIMATE TERESHOLD OF REARING
FOR CONTINUOUS NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

PMFY-P20VBM

Hi

NOTCH

Mi1
Mi2

Lo

35

SPL(dB)

33
30
27

LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROTIMATE
TERESHOLD OF
REARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

PMFY-P25VBM
PMFY-P32VBM

Hi

NOTCH

Mi1
Mi2

Lo

37

SPL(dB)

36
34
32

LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROTIMATE
TERESHOLD OF
REARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

PMFY-P40VBM

Hi

NOTCH

Mi1
Mi2

Lo

39

SPL(dB)

37
35
33

LINE

UNIT

1.5m

MICROPHON

CEILING

Ambient temperature 27:

Test conditions are based on JIS Z8731

8