Mitsubishi Electric PLFY-P08NFMU-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
December 2017
Notes:
• This manual describes service
data of the indoor units only.
• RoHS compliant products
have <G> mark on spec
name plate.
No. OCH604
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
Model name
indication
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
OCH604
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
OCH604
[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 a syphon type.
· Charging should be performed with the cylinder of syphon standing vertically. (Refrigerant is charged from liquid phase.)
Electronic weighing scale
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 weighing 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
9 Micron gauge

4
OCH604
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>
: Supported : Unsupported
Function PAR-32MAA PAC-YT53CRAU
Slim City multi
Body Product size H × W × D (mm)
(inch)
(120 × 120 × 19)
(4-3/4 ×4-3/4 ×3/4)
(120 × 70 × 14.5)
(4-3/4 × 2-3/4× 9/16)
LCD Full Dot LCD Partial Dot LCD
Backlight
Energy-
saving
Energy-saving operation schedule
Automatic return to the preset temperature
Restriction Setting the temperature range restriction
Function Operation lock function
Weekly timer
ON/OFF timer
High Power
Manual vane angle
Wired remote controller function
The functions which can be used are restricted according to each model.

5
OCH604
2-2-1. Wired Remote Controller <PAR-32MAA>
F2 F3 F4F1
Function buttons
F1 F2 F3 F4
Press to turn ON/OFF the indoor unit.
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)
The functions of the function buttons change depending on
the screen. Refer to the button function guide that appears
at the bottom of the LCD for the functions they serve on a
given screen.
When the system is centrally controlled, the button function
guide that corresponds to the locked button will not appear.
Press to save the setting.
SELECT button
Press to return to the previous screen.
RETURN button
Press to bring up the Main menu.
MENU button
Operation settings will appear.
When the backlight is off, pressing any button turns the
backlight on and it will stay lit for a certain period of time
depending on the screen.
Backlit LCD
This lamp lights up in green while the unit is in operation.
It blinks while the remote controller is starting up or when
there is an error.
ON/OFF lamp
Main display : Press to change the operation mode.
Main menu : Press to move the cursor down.
Function button F1
Main display : Press to decrease temperature.
Main menu : Press to move the cursor up.
Function button F2
Main display : Press to increase temperature.
Main menu : Press to go to the previous page.
Function button F3
Main display : Press to change the fan speed.
Main menu : Press to go to the next page.
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>
Function guide

6
OCH604
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>
All icons are displayed for explanation.
Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.
Indoor unit operation mode appears here.
1Operation mode
Preset temperature appears here.
2Preset temperature
Current time appears here.
3Clock (See the Installation Manual.)
4Fan speed
Fan speed setting appears here.
Functions of the corresponding buttons appear here.
5Button function guide
Appears when the ON/OFF operation is centrally controlled.
Appears when the operation mode is centrally controlled.
Appears when the preset temperature is centrally controlled.
Appears when the lter reset function is centrally controlled.
Indicates when lter needs maintenance.
Current room temperature appears here.
1Room temperature
(See the Installation Manual.)
Appears when the buttons are locked.
Appears when the On/Off timer or Night setback function is
enabled.
Appears when the Weekly timer is enabled.
Appears while the units are operated in the energy-save
mode.
Appears when the built-in thermistor on the remote control-
ler is activated to monitor the room temperature.
appears when the thermistor on the indoor unit is acti-
vated to monitor the room temperature.
Appears when the units are operated in the energy-save
mode with 3D i-see Sensor.
Indicates the louver setting. (This function is not available on this unit.)
Indicates the ventilation setting.
Appears when the preset temperature range is restricted.
Indicates the vane setting.
Fri
Mode Temp. Fan
Room
Cool Set temp.
83
83
Fri
Cool
Mode Temp. Fan
Set temp.
83
1
1
5
5
2
2
4
4
33
9
7
6
8
0
1
!
2345
6
7 8
9
)
6
7
8
9
0
2
3
4
5
6
7
8
9
)
!

7
OCH604
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
Menu structure
Filter Information
Error Information
3D i-see Sensor

8
OCH604
Setting and display items Setting details
Vane · Louver · Vent.
(Lossnay)
Use to set the vane angle.
• Select a desired vane setting from 5 different settings.
Use to turn ON/OFF the louver.
• Select a desired setting from "ON" and "OFF."
Use to set the amount of ventilation.
• Select a desired setting from "Off," "Low," and "High."
High power Use to reach the comfortable room temperature quickly.
• Units can be operated in the High-power mode for up to 30 minutes.
Timer ON/OFF
timer*
Use to set the operation ON/OFF times.
• Time can be set in 5-minute increments.
Auto-Off
timer
Use to set the Auto-Off time.
• Time can be set to a value from 30 to 240 in 10-minute increments.
Weekly timer* Use to set the weekly operation ON/OFF times.
• Up to 8 operation patterns can be set for each day.
(Not valid when the ON/OFF timer is enabled.)
Restriction Temp. range Use to restrict the preset temperature range.
• Different temperature ranges can be set for different operation modes.
Operation
lock
Use to lock selected functions.
• The locked functions cannot be operated.
Energy
saving
Auto return Use to get the units to operate at the preset temperature after performing energy-save
operation for a specied time period.
• Time can be set to a value from 30 and 120 in 10-minute increments.
(This function will not be valid when the preset temperature ranges are restricted.)
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.
• Up to 4 energy-save operation patterns can be set for each day.
• Time can be set in 5-minute increments.
• Energy-saving rate can be set to a value from 0% or 50 to 90% in 10% increments.
Night setback* Use to make Night setback settings.
• Select "Yes" to enable the setting, and "No" to disable the setting. The temperature range and
the start/stop times can be set.
Filter information Use to check the lter status.
• The lter sign can be reset.
Error information Use to check error information when an error occurs.
• Check code, error source, refrigerant address, unit model, manufacturing number, contact
information (dealer's phone number) can be displayed.
(The unit model, manufacturing number, and contact information need to be registered in
advance to be displayed.)
Maintenance Manual
vane angle
Use to set the vane angle for each vane to a xed position.
3D i-see
Sensor
Use to set the following functions for 3D i-see Sensor.
• Air distribution • Energy saving option • Seasonal airow
Initial setting Clock Use to set the current time.
Main display Use to switch between "Full" and "Basic" modes for the Main display.
• The initial setting is "Full."
Contrast Use to adjust screen contrast.
Language
selection
Use to select the desired language.
Main menu list
Continue to the next page

9
OCH604
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.
• Model name input • Serial No. input • Dealer information input
LOSSNAY
setting
This setting is required only when the operation of City Multi units is interlocked with
LOSSNAY units.
Check Error history: Display the error history and execute delete error history.
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.

10
OCH604
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 are set up.
(Refer to the Installation Manual.)
Fan speed icon
Vane icon
icon appears when the power is on.
Indoortemperature
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
Heating preset
temperature
Cooling preset
temperature