Mitsubishi Electric City Multi Series Operating manual

TECHNICAL & SERVICE MANUAL
Indoor unit
[Model Name] [Service Ref.]
PLFY-EP06NEMU-E
PLFY-EP08NEMU-E
PLFY-EP12NEMU-E
PLFY-EP15NEMU-E
PLFY-EP18NEMU-E
PLFY-EP18NEMU-E1
PLFY-EP24NEMU-E
PLFY-EP30NEMU-E
PLFY-EP36NEMU-E
PLFY-EP48NEMU-E
CONTENTS
1. SAFETY PRECAUTION.......................... 2
2. PARTS NAMES AND FUNCTIONS........4
3. SPECIFICATIONS.................................12
4. 4-WAY AIRFLOW SYSTEM..................18
5. OUTLINES AND DIMENSIONS............ 21
6. WIRING DIAGRAM...............................22
7.
REFRIGERANT SYSTEM DIAGRAM
......
23
8. MICROPROCESSOR CONTROL......... 24
9. TROUBLESHOOTING........................ 31
10. DISASSEMBLY PROCEDURE........... 39
PLFY-EP06NEMU-E
PLFY-EP08NEMU-E
PLFY-EP12NEMU-E
PLFY-EP15NEMU-E
PLFY-EP18NEMU-E
PLFY-EP18NEMU-E1
PLFY-EP24NEMU-E
PLFY-EP30NEMU-E
PLFY-EP36NEMU-E
PLFY-EP48NEMU-E
INDOOR UNIT
Model name
indication for
MAIN UNIT PARTS CATALOG (OCB610)
R410A
INDOOR UNIT FOR VRF SYSTEM
February 2019
No. OCH610
Model name
indication for
GRILLE
REVISED EDITION-G
Notes:
• Some descriptions
have been modified in
REVISED-EDITION-G.
OCH610 REVISED EDITION-F
is void.

2
OCH610G
1
CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
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 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 com-
pressor.
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.
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.
SAFETY PRECAUTION

3
OCH610G 3
[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 768.7 PSIG [5.3MPa.G] or over.
2Charge hose · Only for R410A
· Use pressure performance of 738.2 PSIG [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

4
OCH610G
2PARTS NAMES AND FUNCTIONS
Drain pipe
Filter
Vane
Gas pipe
Liquid pipe
Air outlet
i-see Sensor
Air intake
(Intake grille)
2-1. Indoor Unit
2-2. Wired Remote Controller <PAR-40MAA> <PAC-YT53CRAU>
: Supported : Unsupported
Function PAR-40MAA PAC-YT53CRAU
Slim CITY MULTI
Body Product size H × W × D (mm) 120 × 120 × 14.5 120 × 70 × 14.5
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
*Some functions may not be available depending on model types.
Wired remote controller function
The functions which can be used are restricted according to each model.

5
OCH610G 5
2-2-1. Wired Remote Controller <PAR-40MAA>
Function buttons
MENU
ON
OFF
RETURN SELECT
HOLD
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 turn ON/OFF the indoor unit.
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.
1[ON/OFF] button 6ON/OFF lamp
Press to save the setting.
When the Main menu is displayed, pressing this button will
enable/disable the HOLD function. Main display: Press to change the operation mode.
Menu screen: The button function varies with the screen.
2[SELECT/HOLD] button
7Function button [F1]
Press to return to the previous screen. Main display: Press to decrease temperature.
Main menu: Press to move the cursor left.
Menu screen: The button function varies with the screen.
3[RETURN] button 8Function button [F2]
4[MENU] button
9Function button [F3]
Press to bring up the Main menu.
Main display: Press to increase temperature.
Main menu: Press to move the cursor right.
Menu screen: The button function varies with the screen.
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 de-
pending on the screen. Main display: Press to change the fan speed.
Menu screen: The button function varies with the screen.
5Backlit LCD
0Function button [F4]
83
83
Fri
Room
Set temp.
Mode Temp. Fan
Cool Auto
Main Main menu
Energy saving
Main display:
Cursor
Operation
Vane·Louver·Vent. (Lossnay)
High power
Comfort
Main menuMain display
Menu screen
7890
7890
7890
Function guide
Controller interface