Mitsubishi Electric PEY Series User manual

SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Model name
<Indoor unit>
Model name
<Indoor unit>
PEY-P18JA(L)(T)
PEY-P24JA(L)(T)
PEY-P30JA(L)(T)
PEY-P36JA(L)(T)
PEY-P42JA(L)(T)
PEY-P48JA(L)(T)
Series PEY
2014
INDOOR UNIT

2
HWE1305A
CONTENTS
1. SAFETY PRECAUTIONS········································································· 3
1-1. Always observe for safety ...................................................................................................... 3
1-2. Cautions related to new refrigerant........................................................................................3
2. PART NAMES AND FUNCTIONS ······························································ 5
2-1. Indoor unit.............................................................................................................................. 5
2-2. Wireless remote controller ..................................................................................................... 6
2-3. Wired remote controller <PAR-31MAA> ................................................................................7
2-4. Wired remote controller <PAR-21MAA> ..............................................................................12
3. SPECIFICATION ···················································································13
4. FAN PERFORMANCE AND CORRECTED AIR FLOW ·································14
5. SOUND PRESSURE LEVELS ·································································18
5-1. Sound pressure level ........................................................................................................... 18
5-2. NC curves ............................................................................................................................ 19
6. OUTLINES & DIMENSIONS ····································································23
6-1. Indoor unit............................................................................................................................ 23
7. WIRING DIAGRAM················································································25
8. REFRIGERANT SYSTEM DIAGRAM ························································26
9. TROUBLESHOOTING············································································27
9-1. Troubleshooting ................................................................................................................... 27
9-2. Malfunction-diagnosis method by remote controller ............................................................ 28
9-3. Self-diagnosis action table................................................................................................... 31
9-4. Troubleshooting of problems................................................................................................ 35
9-5. Emergency operation........................................................................................................... 37
9-6. How to check the parts ....................................................................................................... 38
9-7. Test point diagram................................................................................................................ 40
9-8. Functions of dip switch and jumper wire..............................................................................42
10. DISASSEMBLY PROCEDURE ·······························································43
10-1. Control box.........................................................................................................................43
10-2. Thermistor (Intake air)........................................................................................................ 43
10-3. Drainpan ............................................................................................................................ 44
10-4. Thermistor (Condenser/evaporator) (Liquid pipe)..............................................................45
10-5. Fan and fan motor..............................................................................................................46
10-6. Heat exchanger..................................................................................................................47

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HWE1305A
SAFETY PRECAUTIONS
1. SAFETY PRECAUTIONS
1-1. Always observe for safety
Before obtaining access to terminal, all supply
circuits must be disconnected.
1-2. Cautions related to new refrigerant
Cautions for units utilising refrigerant R410A
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the followings.
•Be sure to perform replacement operation before test run.
•Change flare nut to the one provided with this product.
Use a newly flared pipe.
•Avoid using thin pipes.
Make sure that the inside and outside of
refrigerant 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.
Contamination inside refrigerant piping can cause
deterioration of refrigerant oil etc.
Store the piping indoors and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of
compressor.
The refrigerant oil applied to flares and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause
deterioration of refrigerant oil etc.
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 refrigerant
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 necaessary to use R410A
refrigerant.
Tools for R410A
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adaptor
Torque wrench Electronic refrigerant charging scale
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of
compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigerant
will change and the efficiency will be lowered.
Use the specified refrigerant only.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with a
flame, poisonous gases will be released.
<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.

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HWE1305A
SAFETY PRECAUTIONS
<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
1 Gauge manifold
•Only for R410A
•Use the existing fitting specifications. (UNF1/2)
•Use high-tension side pressure of 5.3MPa·G or over.
2 Charge hose •Only for R410A
•Use pressure performance of 5.09MPa·G or over.
3 Electronic scale —
4 Gas leak detector •Use the detector for R134a, R407C or R410A.
5 Adaptor for reverse flow check •Attach on vacuum pump.
6 Refrigerant charge base —
7 Refrigerant cylinder
•Only for R410A
•Top of cylinder (Pink)
•Cylinder with syphon
8 Refrigerant recovery equipment —

5
HWE1305A
PART NAMES AND FUNCTIONS
2. PART NAMES AND FUNCTIONS
2-1. Indoor unit
In case of bottom inlet
Air intake (sucks the
air inside the room
into the unit)
In case of rear inlet
Air outlet

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HWE1305A
PART NAMES AND FUNCTIONS
2-2. Wireless remote controller
ON/OFF TEMP
FAN
VANE
TEST RUN
AUTO STOP
AUTO START
h
min
LOUVER
MODE
CHECK
RESETSET CLOCK
MODEL SELECT
NOT AVAILABLE
CHECK TEST RUN
°C
AMPM
AMPM
VANE CONTROL button
Used to change the air flow direction.
CLOCK button
RESET button
SET button
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
MODE SELECT button
Used to switch the operation mode between
cooling, drying and fan mode.
CHECK-TEST RUN button
Only press this button to perform an inspection
check or test operation.
Do not use it for normal operation.
FAN SPEED SELECT button
Used to change the fan speed.
TIMER display
Displays when in timer operation or when
setting timer.
button
SET TEMPERATURE button sets any desired
room temperature.
CLOCK display
Displays the current time.
“ ” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
Buttons used to set the “hour and minute” of
the current time and timer settings.
h and min buttons
display
display
FAN SPEED display indicates which fan speed
has been selected.
display
The vertical direction of air flow is indicated.
display
Blinks when model is selected.
display
display
CHECK and TEST RUN display indicate that
the unit is being checked or test-run.
display
OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.
TIMER CONTROL buttons
AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be automatically
stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.
MODEL SELECT
CHECK TEST RUN
LOUVER button
Changes left/right airflow direction.
(Not available for this model.)
SET TEMP. display indicates the desired
temperature which is set.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.

7
HWE1305A
PART NAMES AND FUNCTIONS
2-3. Wired remote controller <PAR-31MAA>
2-3-1. Wired remote controller function
* The functions which can be used are restricted according to the model.
: Supported : Unsupported
Function 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
Function buttons
F1 F2 F3 F4
5
6
1234
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.
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
7890 7890
1ON / OFF button
Press to turn ON/OFF the indoor unit.
2SELECT button
Press to save the setting.
3RETURN button
Press to return to the previous screen.
4MENU button
Press to bring up the Main menu.
5Backlit LCD
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.
6ON / OFF lamp
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.
7Function button F1
Main display : Press to change the operation mode.
Main menu : Press to move the cursor down.
8Function button F2
Main display : Press to decrease temperature.
Main menu : Press to move the cursor up.
9Function button F3
Main display : Press to increase temperature.
Main menu : Press to go to the previous page.
0Function button F4
Main display : Press to change the fan speed.
Main menu : Press to go to the next page.
When the backlight is off, pressing any button turns the backlight on and does not perform its function.
(except for the (ON / OFF) button)

8
HWE1305A
PART NAMES AND FUNCTIONS
The main display can be displayed in two different modes: "Full" and "Basic".
The factory setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting.
Fri
Cool
Mode Temp. Fan
AutoSet temp.
<Full mode> <Basic mode>
* All icons are displayed for explanation.
Fri
Mode Temp. Fan
Room
Cool Auto
Set temp.
1
1
a
2
2
b
33
c
4
4
d
5
5
e
6
f
7
g
8
h
9i
0
j
▌
1Operation mode
Indoor unit operation mode appears here.
▌
2Preset temperature
Preset temperature appears here.
▌
3Clock
Current time appears here.
(See the Installation Manual.)
▌
4Fan speed
Fan speed setting appears here.
▌
5Button function guide
Functions of the corresponding buttons appear here.
▌
6
Appears when the ON/OFF operation is centrally
controlled.
▌
7
Appears when the operation mode is centrally controlled.
▌
8
Appears when the preset temperature is centrally
controlled.
▌
9
Appears when the filter reset function is centrally
controlled.
▌
0
Indicates when filter needs maintenance.
▌
aRoom temperature
Current room temperature appears here.
(See the Installation Manual.)
▌
b
Appears when the buttons are locked.
▌
c
Appears when the On/Off timer or Night setback function is
enabled.
▌
d
Appears when the Weekly timer is enabled.
▌
e
Appears while the units are operated in the energy-save
mode.
▌
f
Appears when the built-in thermistor on the remote
controller is activated to monitor the room temperature.
appears when the thermistor on the indoor unit is
activated to monitor the room temperature.
▌
g
Indicates the vane setting.
▌
h
Indicates the louver setting.
▌
i
Indicates the ventilation setting.
▌
j
Appears when the preset temperature range is restricted.
Most settings (except ON / OFF, mode, fan speed, temperature) can be made from the Menu screen.

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HWE1305A
PART NAMES AND FUNCTIONS
2-3-2. Menu structure
Press the [MENU] button.
Move the cursor to the desired item with the [F1] and [F2] buttons, and press the [SELECT] button.
Main menu
Vane · Louver · Vent. (Lossnay)
High power
Timer
On / Off timer
Auto-Off timer
Filter information
Error information
Weekly timer
Energy saving
Auto return
Schedule
Night setback
Restriction
Temp. range
Operation lock
Maintenance
Auto descending panel
Manual vane angle
Initial setting
Main / Sub
Clock
Main display
Contrast
Display details
Auto mode
Administrator password
Language selection
Service
Service menu
Test run
Drain pump test run
Input maintenance info.
Function setting
Lossnay (City Multi only)
Check
Self check
Maintenance password
Remote controller check
Not all functions are available on all models of indoor units.

10
HWE1305A
PART NAMES AND FUNCTIONS
2-3-3. Main menu list
Setting and display items Setting details
Vane · Louver · Vent.
(Lossnay)
Use to set the vane angle.
•Select a desired vane setting from five 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 filter status.
•The filter 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 specified 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% and 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 fixed 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.