Mitsubishi Electric PLFY-P05NFMU-E Operating manual

Indoor unit
[Model Name] [Service Ref.]
PLFY-P05NFMU-E.TH
PLFY-P08NFMU-E.TH
PLFY-P12NFMU-E.TH
PLFY-P15NFMU-E.TH
PLFY-P18NFMU-E.TH
PLFY-P05NFMU-E
PLFY-P08NFMU-E
PLFY-P12NFMU-E
PLFY-P15NFMU-E
PLFY-P18NFMU-E
R410A
TECHNICAL & SERVICE MANUAL
March 2018
Notes:
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No. OCH604
REVISED EDITION-A
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INDOOR UNIT
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CONTENTS
1. SAFETY PRECAUTION..........................2
2. PARTS NAMES AND FUNCTIONS........ 4
3. SPECIFICATIONS.................................12
4. 4-WAY AIR FLOW SYSTEM.................14
5. OUTLINES AND DIMENSIONS............16
6. WIRING DIAGRAM...............................17
7.
REFRIGERANT SYSTEM DIAGRAM...... 18
8. TROUBLESHOOTING..........................19
9. DISASSEMBLY PROCEDURE............. 27
PARTS CATALOG (OCB604)

2
OCH604A
1SAFETY PRECAUTION
CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged in a 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 enters 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 enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of
equipment components.
If large amount of mineral oil enters, 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 indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Micron gauge
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.

3
OCH604A
[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
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Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
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4
OCH604A
2PARTS NAMES AND FUNCTIONS
2-1. Indoor Unit
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Grille
Filter
Removes dust and pollutants
from drawn in air.
Horizontal Air Outlet
Sets horizontal airflow automatically
during cooling or dehumidifying.
Air Intake
Draws in air from room.
2-2. Wired Remote Controller <PAR-32MAA> <PAC-YT53CRAU>
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Wired remote controller function
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
OCH604A
2-2-1. Wired Remote Controller <PAR-32MAA>
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ON/OFF button
When the backlight is off, pressing any button turns
the backlight on and does not perform its function.
(except for the (ON/OFF) button)
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SELECT button
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RETURN button
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MENU button
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Backlit LCD
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ON/OFF lamp
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Function button F1
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Function button F2
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Function button F3
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Function button F4
83
83
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
<Main display> <Main menu>
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6
OCH604A
The main display can be displayed in 2 different modes: "Full" and "Basic".
T
he initial setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting.
<Full mode> <Basic mode>
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Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.
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1Operation mode
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2Preset temperature
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3Clock (See the Installation Manual.)
4Fan speed
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5Button function guide
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1Room temperature
(See the Installation Manual.)
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Fri
Mode Temp. Fan
Room
Cool Set temp.
83
83
Fri
Cool
Mode Temp. Fan
Set temp.
83
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5
2
2
4
4
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6
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
OCH604A
Not all functions are available on all models of indoor units.
Energy saving
Auto return
Schedule
Night setback
Main menu Press the MENU button.
Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button.
Vane · Louver · Vent. (Lossnay)
High power
Weekly timer
Restriction
Maintenance
Initial setting
ON/OFF timer
Auto-Off timer
Temp. range
Operation lock
Manual vane angle
Main/Sub
Timer
Main display
Contrast
Display details
Auto mode
Administrator password
Language selection
Service
Input maintenance info.
Function setting
Lossnay (City Multi only)
Check
Self check
Maintenance password
Remote controller check
Test run
Clock
Filter Information
Error Information
3D i-see Sensor

8
OCH604A
Setting and display items Setting details
Vane · Louver · Vent.
(Lossnay) Use to set the vane angle. 6eOeFt DGesLUeGYDQe settLQJ IUoPGLIIeUeQt settLQJs
Use to turn ON/OFF the louver.
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Use to set the amount of ventilation.
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High power Use to reach the comfortable room temperature quickly.
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Timer ON/OFF
timer* Use to set the operation ON/OFF times. 7LPe FDQ Ee set LQ PLQXte LQFUePeQts
Auto-Off
timer Use to set the Auto-Off time. 7LPe FDQ Ee set to DYDOXe IUoP30 to 240 LQ 0PLQXte LQFUePeQts
Weekly timer* Use to set the weekly operation ON/OFF times.
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Restriction Temp. range Use to restrict the preset temperature range.
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Operation
lock Use to lock selected functions. 7Ke OoFNeGIXQFtLoQs FDQQot Ee oSeUDteG
Energy
saving Auto return Use to get the units to operate at the preset temperature after performing energy-save RSHUDWLRQIRUDVSHFL¿HGWLPHSHULRG
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Schedule* Set the start/stop times to operate the units in the energy-save mode for each day of the
week, and set the energy-saving rate.
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Night setback* Use to make Night setback settings.
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tKe stDUtstoStLPes FDQ Ee set
Filter information 8VHWRFKHFNWKH¿OWHUVWDWXV
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Error information Use to check error information when an error occurs.
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Maintenance Manual
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3D i-see
Sensor Use to set the following functions for 3D i-see Sensor. ALU GLstULEXtLoQ(QeUJ\ sDYLQJ oStLoQ6eDsoQDO DLUÀoZ
Initial setting Clock Use to set the current time.
Main display Use to switch between "Full" and "Basic" modes for the Main display.
7Ke LQLtLDO settLQJ Ls )XOO
Contrast Use to adjust screen contrast.
Language
selection Use to select the desired language.
Main menu list
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
OCH604A
Setting and display items Setting details
Input
maintenance Select "Input maintenance Info." from the Service menu to bring up the Maintenance information screen.
The following settings can be made from the Maintenance Information screen.
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LOSSNAY
setting This setting is required only when the operation of City Multi units is interlocked with LOSSNAY units.
Check Error history: 'LsSOD\ tKe eUUoUKLstoU\ DQG e[eFXte GeOete eUUoUKLstoU\
Self check Error history of each unit can be checked via the remote controller.
Maintenance
password Use to change the maintenance password.
Remote
controller
check
When the remote controller does not work properly, use the remote controller checking
function to troubleshoot the problem.

0
OCH604A
2-2-2. Wired Remote Controller <PAC-YT53CRAU>
.
Backlit LCD
ON/OFF lamp
ON/OFF button
FAN button
VANE button
Note: To set the functions that are not available on this controller (PAC-YT53CRAU) such as Louver,
use the centralized controller.
The lamp will light up in green when
turned on, and blink during startup
and when an error occurs.
Pressing this button starts and
stops the operation.
TEMP. button
MODE button
Note:
The phrase "Wired remote controller" in this manual refers only to the PAC-YT53CRAU.
If you need any information for the other remote controller, please refer to either the installation manual or initial setting manual which are included in
remote controller's box.
GB
Display section
*2 icon
For City Multi, when an error occurs, power indicator will blink, and unit address (3 digits) and check code (4
digits) will blink.
Check the error status, stop the operation, and consult your dealer.
icon appears while the unit is operated in the
energy-save mode
Note: All icons are displayed for explanation purpose
icon appears when Operation lock setting is
effective.
icon appears when indoor unit functions areset up.
(Refer to the Installation Manual.)
Fan speed icon
Vane icon
icon appears when the power is on.
Indoor temperature
Operation modes
CENTRAL icon *1
CHECK icon *2
Preset temperature *3
*1 icon
Appears when one of the following local operations is prohibited: ON/OFF; operation mode; preset temperature;
fan speed; vane.
CENTRAL
*3 Preset temperature
* Centigrade or Fahrenheit is selectable. Refer to the Installation Manual for details.
In COOL, DRYING, HEAT, or
AUTO (single set point) modes In AUTO (dual set point) or SETBACK modes
Room Setto
AUTO COOL HEATFAN
DRYINGVENTI.SETBACK
Preset
temperature
Room Setto
AUTO COOLHEATFAN
DRYINGVENTI.SETBACK
Heatingpreset
temperature
Cooling preset
temperature