Mitsubishi Electric City Multi PMFY Series Operating manual

TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names] [Service Ref.]
No. OC307
REVISED EDITION-F
INDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES.....................2
2. SAFETY PRECAUTION .....................3
3. PART NAMES AND FUNCTIONS......5
4. SPECIFICATIONS ............................12
5. OUTLINES AND DIMENSIONS .......16
6. WIRING DIAGRAM...........................17
7. REFRIGERANT SYSTEM DIAGRAM.... 21
8. TROUBLESHOOTING......................22
9. DISASSEMBLY PROCEDURE.........32
10. SERVICE PARTS LIST.....................36
Ceiling Cassettes
Series PMFY
R410A
March 2019
Revision:
• Some descriptions have
been modified in REVISED
EDITION-F.
OC307 REVISED
EDITION-E is void.
PMFY-P20VBM-E
PMFY-P25VBM-E
PMFY-P32VBM-E
PMFY-P40VBM-E
PMFY-P20VBM-E
PMFY-P20VBM-E#2
PMFY-P20VBM-ER4
PMFY-P25VBM-E
PMFY-P25VBM-E#2
PMFY-P25VBM-ER4
PMFY-P32VBM-E
PMFY-P32VBM-E#2
PMFY-P32VBM-ER4
PMFY-P40VBM-E
PMFY-P40VBM-E#2
PMFY-P40VBM-ER4
PMFY-P20VBM-E1
PMFY-P20VBM-ER3
PMFY-P25VBM-E1
PMFY-P25VBM-ER3
PMFY-P32VBM-E1
PMFY-P32VBM-ER3
PMFY-P40VBM-E1
PMFY-P40VBM-ER3
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

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OC307F
1TECHNICAL CHANGES
PMFY-P20VBM-E PMFY-P20VBM-E1
PMFY-P25VBM-E PMFY-P25VBM-E1
PMFY-P32VBM-E PMFY-P32VBM-E1
PMFY-P40VBM-E PMFY-P40VBM-E1
1. FAN MOTOR (MF) has been changed.
2. CONTROLLER BOARD (I.B) has been changed.
PMFY-P20VBM-E1PMFY-P20VBM-E#2
PMFY-P25VBM-E1PMFY-P25VBM-E#2
PMFY-P32VBM-E1PMFY-P32VBM-E#2
PMFY-P40VBM-E1PMFY-P40VBM-E#2
1. CONTROLLER BOARD (I.B) has been changed.
2. PANEL has been changed.
PMP-40BM → PMP-40BMW
(White : 0.98Y 8.99/0.63) (Pure white : 6.4Y 8.9/0.4)
3. FAN MOTOR (MF) has been changed.
4. THERMISTOR (TH22, TH23) have been changed.
PMFY-P20VBM-E#2 PMFY-P20VBM-ER3
PMFY-P25VBM-E#2 PMFY-P25VBM-ER3
PMFY-P32VBM-E#2 PMFY-P32VBM-ER3
PMFY-P40VBM-E#2 PMFY-P40VBM-ER3
1. DRAIN PIPE has been changed.
2. JOINT SOCKET (FOR DRAIN PIPE) has been added.
PMFY-P20VBM-ER3 PMFY-P20VBM-ER4
PMFY-P25VBM-ER3 PMFY-P25VBM-ER4
PMFY-P32VBM-ER3 PMFY-P32VBM-ER4
PMFY-P40VBM-ER3 PMFY-P40VBM-ER4
1. INDOOR CONTROLLER BOARD has been changed. (S/W version up)

3
OC307F
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the followings.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
Store the piping indoors, and 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.
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.
2SAFETY PRECAUTION

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OC307F
[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 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.
5Adapter 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 —

5
OC307F 5
3PART NAMES AND FUNCTIONS
3-1. Indoor Unit
Guide vane
Air flow can be changed to horizontal
by moving the Guide vane to the left or right.
Air intake
Returns air from room.
Filters
Remove dust and pollutants
from return air.
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Horizontal Air Outlet

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OC307F
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
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
3-2. WIRED REMOTE CONTROLLER <PAR-30MAA/PAR-31MAA>
* The functions which can be used are restricted according to the model. : Supported : Unsupported
Function PAR-30MAA/PAR-31MAA PAR-21MAA
Slim CITY MULTI
Body Product size H × W × D (mm) 120 × 120 × 19 120 × 130 × 19
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

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OC307F
Fri
Mode Temp. Fan
Room
Cool Auto
Set temp.
Fri
Cool
Mode Temp. Fan
AutoSet temp.
Fri
Mode Temp. Fan
Room
Cool Auto
Set temp.
Fri
Cool
Mode Temp. Fan
AutoSet temp.
The main display can be displayed in two different modes: "Full" and "Basic".
T
he factory 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.
Operation mode
Preset temperature appears here.
Preset temperature
Current time appears here.
Clock (See the Installation Manual.)
Fan speed
Fan speed setting appears here.
Functions of the corresponding buttons appear here.
Button 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.
Room 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.
Indicates the vane setting.
Indicates the louver setting.
Indicates the ventilation setting.
Appears when the preset temperature range is restricted.

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OC307F
Not all functions are available on all models of indoor units.
Filter information
Error information
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
Service menu
Input maintenance info.
Function setting
Lossnay (CITY MULTI only)
Check
Self check
Maintenance password
Remote controller check
Test run
Clock
Drain pump test run
Auto descending panel
Menu structure

9
OC307F
Setting and display items Setting details
Vane · Louver · Vent.
(Lossnay) Use to set the vane angle. • Select a desired vane setting from ve 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.
* Clock setting is required.
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.
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.
• Error 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.
Weekly timer Use to set the weekly operation On / Off times.
• Up to eight operation patterns can be set for each day.
* Clock setting is required.
* Not valid when the On/Off timer is enabled.
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 four 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.
* Clock setting is required.
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.
* Clock setting is required.
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.
Maintenance Auto
descending
panel
Auto descending panel (Optional parts) Up / Down you can do.
Manual
vane angle Usetosetthevaneangleforeachvanetoaxedposition.
Initial setting Main/Sub When connecting two remote controllers, one of them needs to be designated as a sub
controller.
Clock Use to set the current time.
Main display Use to switch between "Full" and "Basic" modes for the Main display.
• The default setting is "Full."
Contrast Use to adjust screen contrast.
Main menu list

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OC307F
Setting and display items Setting details
Initial setting Display
details Make the settings for the remote controller related items as necessary. Clock: The factory settings are "Yes" and "24h" format.
Temperature: Set either Celsius (°C) or Fahrenheit (°F).
Room temp. : Set Show or Hide.
Auto mode: Set the Auto mode display or OnlyAuto display.
Auto mode Whether or not to use the AUTO mode can be selected by using the button.
This setting is valid only when indoor units with the AUTO mode function are connected.
Administrator
password
The administrator password is required to make the settings for the following items.
• Timer setting • Energy-save setting • Weekly timer setting
• Restriction setting • Outdoor unit silent mode setting • Night set back
Language
selection Use to select the desired language.
Service Test run Select "Test run" from the Service menu to bring up the Test run menu.
• Test run • Drain pump test run
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
Function
setting Make the settings for the indoor unit functions via the remote controller as necessary.
LOSSNAY
setting
(CITY MULTI
only)
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.
Refrigerant leak check: Refrigerant leaks can be judged.
Smooth maintenance: The indoor and outdoor maintenance data can be displayed.
Request cord: Details of the operation data including each thermistor temperature and error
history can be checked.
Self check Error history of each unit can be checked via the remote controller.
Maintenance
password Take the following steps to change the maintenance password.
Remote
controller
check
When the remote controller does not work properly, use the remote controller checking
function to troublushoot the problem.