Mitsubishi Electric PFFY-P20VKM-ER1 Operating manual

TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names] [Service Ref.]
PFFY-P20VKM-E
PFFY-P20VKM-ER1
PFFY-P25VKM-E
PFFY-P25VKM-ER1
PFFY-P32VKM-E
PFFY-P32VKM-ER1
PFFY-P40VKM-E
PFFY-P40VKM-ER1
No. OC404
REVISED EDITION-A
INDOOR UNIT
Floor Standing
Series PFFY
CONTENTS
1. TECHNICAL CHANGES.........................2
2. SAFETY PRECAUTION..........................2
3. PART NAMES AND FUNCTIONS.......... 6
4. SPECIFICATION..................................... 8
5. NOISE CRITERIA CURVES..................10
6. AIR OUTLET SELECTION....................11
7. OUTLINES AND DIMENSIONS............12
8. WIRING DIAGRAM...............................13
9. REFRIGERANT SYSTEM DIAGRAM...... 14
10. TROUBLE SHOOTING.........................15
11. DISASSEMBLY PROCEDURE.............23
12. RoHS PARTS LIST...............................28
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R407C R22
R410A
November 2008
Indication of model name
NOTE:
This service manual describes technical data of the indoor units.
• As for outdoor units refer to outdoor unit’s service manual.
• RoHS compliant products have <G> mark on the spec name plate.
• Please void OC404.
Revision:
• PFFY-P20/25/32/40
VKM-ER1 are added in
REVISED EDITION-A.
• Some descriptions have
been modified.
PFFY-P20VKM-E
PFFY-P25VKM-E
PFFY-P32VKM-E
PFFY-P40VKM-E

2
1TEHNICAL CHANGES
Cautions for units utilizing refrigerant R407C
CAUTIONS RELATED TO NEW REFRIGERANT
Do not use the existing refrigerant piping.
The old refrigerant and lubricant in the existing piping
contains a large amount of chlorine which may cause the
lubricant deterioration of the new unit.
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 lubricant
will result.
Use ESTR , ETHER or HAB as the lubricant to
coat flares and flange connection parts.
If large amount of mineral oil enter, 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.
Store the piping to be used indoors during
installation and both ends 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. Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
SAFETY PRECAUTION
2
PFFY-P20VKM-E PFFY-P20VKM-ER1
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1
INDOOR CONTROLLER BOARD (I.B.) has been changed.

33
[3] Service tools
Use the below service tools as exclusive tools for R407C refrigerant.
No. Tool name Specifications
1Gauge manifold ·Only for R407C.
·Use the existing fitting SPECIFICATIONS. (UNF7/16)
·Use high-tension side pressure of 3.43MPa·G or over.
2Charge hose ·Only for R407C.
·Use pressure performance of 5.10MPa·G or over.
3Electronic scale
4Gas leak detector ·Use the detector for R134a or R407C.
5Adapter for reverse flow check. ·Attach on vacuum pump.
6Refrigerant charge base.
7Refrigerant cylinder. ·For R407C ·Top of cylinder (Brown)
·Cylinder with syphon
8Refrigerant recovery equipment.
[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)
(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.
[1] Cautions for service
·After recovering the all 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.
Gravimeter
Unit

4
Cautions for units utilizing refrigerant R410A
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
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.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant 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.
Handle tools with care.
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enter, that can cause deterio-
ration of refrigerant oil etc.
Do not use the existing refrigerant piping.
The old refrigerant and lubricant in the existing piping
contains a large amount of chlorine which may cause the
lubricant deterioration of the new unit.
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 lubricant
will result.
Store the piping to be used indoors during
installation and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

5
[1] Cautions for service
(1) Perform service after collecting 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.)
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1Gauge manifold ·Only for R410A
·Use the existing fitting specifications. (UNF1/2)
·Use high-tension side pressure of 5.3MPa·G or over.
2Charge hose ·Only for R410A
·Use pressure performance of 5.09MPa·G or over.
3Electronic scale
4Gas leak detector ·Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check ·Attach on vacuum pump.
6Refrigerant charge base
7Refrigerant cylinder ·Only for R410A Top of cylinder (Pink)
Cylinder with syphon
8Refrigerant recovery equipment

6
PART NAMES AND FUNCTIONS
3
Indoor Unit
Louver
Louver
Air outlet
Filter
Vane
Air outlet Air inlet
Damper
Operation buttons
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
Set Temperature 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
door.
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 preceding operation
number.
Ventilation button
(Operation button)
To next operation number.
Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
Wired remote controller

77
Display
For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.
°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
Identifies the current operation
Shows the operating mode, etc.
* Multilanguage display is sup-
ported.
“Centrally Controlled” indicator
Indicates that operation of the re-
mote 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, shows the time
remaining.
“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
Comes 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
Displayed if the airflow is set to
Low and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di-
rection also changes.
Room Temperature display
Shows the room temperature.
Louver display
Indicates the action of the swing
louver. Does not appear if the
louver is stationary.
(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.
Caution
Only the Power on indicator lights when the unit is stopped and power supplied to the unit.
If you press a button for a feature that is not installed at the indoor unit, the remote controller will display the “Not Available”
message.
If you are using the remote controller to drive multiple indoor units, this message will appear only if he feature is not
present at every unit connected.
When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication
(For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.
For the PFFY-P VKM series, the airflow direction displayed on the remote controller is different from the actual airflow direc-
tion. Refer to the following table.
Display
Actual
1234
(Horiz.) Swing
123 4
(Horiz.) Swing
The airflow direction for the lower air outlet damper cannot be set. The airflow direction is automatically controlled by a com-
puter.

8
4SPECIFICATION
4-1. Specification
Item PFFY-P20VKM-E
PFFY-P20VKM-ER1
Power source 1-phase 220-240V 50Hz
Cooling capacity kW 2.2 2.8 3.6 4.5
Heating capacity kW 2.5 3.2 4.0 5.0
Power Cooling kW 0.025 0.025 0.025 0.028
consumption Heating kW 0.025 0.025 0.025 0.028
Current Cooling A 0.20 0.20 0.20 0.24
Heating A 0.20 0.20 0.20 0.24
Height mm 600 600 600 600
Dimension Width mm 700 700 700 700
Depth mm 200 200 200 200
Weight kg 15 15 15 15
Heat exchanger Cross fin (Aluminum plate fin and copper tube)
Type Line flow fan %2
Airflow rate *2 m
3
/min 5.9-6.8-7.6-8.7 6.1-7.0-8.0-9.1 6.1-7.0-8.0-9.1 8.0-9.0-9.5-10.7
Fan
External static Pa 0
pressure
Motor Type DC motor
Output kW 0.03 %2
Air filter PP honeycomb fabric (Catechin air filter)
Refrigerant Gas (Flare) :mm :12.7
pipe dimension Liquid (Flare) :mm :6.35
Field drain pipe size :mm I.D.16(PVC pipe VP-16 connectable)
Noise level *2 dB(A)27-31-34-37 28-32-35-38 28-32-35-38 35-38-42-44
PFFY-P25VKM-E
PFFY-P25VKM-ER1
PFFY-P32VKM-E
PFFY-P32VKM-ER1
PFFY-P40VKM-E
PFFY-P40VKM-ER1
Note 1. Rating conditions (JIS B 8616)
Cooling :Indoor : D.B. 27°C W.B. 19.0°C
outdoor :D.B. 35°C
Heating : Indoor : D.B. 20°C
outdoor :D.B. 7°C W.B. 6°C
*2. Air flow and the noise level are indicated as High-Medium1-Medium2-Low.

99
Parts name
Model
Symbol
TH21
TH22
TH23
FUSE
MF1
MF2
MV1
MV2
LEV
TB2
TB5
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
250V 6.3A
(L, N, ) 330V 30A
(M1, M2, S) 250V 20A
Vane motor
Damper motor
Linear expansion valve
[coil]
PFFY-P20VKM-E
PFFY-P20VKM-ER1
Fuse
(Indoor controller board)
Fan motor (Upper)
Fan motor (Lower)
Power supply terminal
block
Transmission terminal
block
OUTPUT 30W
ARW40Z8P30MS
MP20Z
DC12V
MP35EA
DC12V
DC12V Stepping motor drive Port dimension
: 5.2 (0~2000 pulse)
EFM-40YGME
OUTPUT 30W
ARW40Y8P30MS
Thermistor
(Room temperature
detection)
Thermistor
(Pipe temperature
detection/Liquid)
Thermistor
(Pipe temperature
detection/Gas)
PFFY-P25VKM-E
PFFY-P25VKM-ER1
PFFY-P32VKM-E
PFFY-P32VKM-ER1
PFFY-P40VKM-E
PFFY-P40VKM-ER1
4-2. Electrical parts specifications

10
5NOISE CRITERIA CURVES
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27Wet-bulb temperature 19
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
44
44
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20Wet-bulb temperature 15
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27Wet-bulb temperature 19
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
37
37
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20Wet-bulb temperature 1590
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27Wet-bulb temperature 19
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
38
38
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20Wet-bulb temperature 15
PFFY-P20VKM-E PFFY-P20VKM-ER1
INDOOR UNIT
WALL
1m 1m
MICROPHONE
PFFY-P25VKM-E PFFY-P25VKM-ER1
PFFY-P32VKM-E PFFY-P32VKM-ER1
PFFY-P40VKM-E PFFY-P40VKM-ER1