Mitsubishi Electric PKA-A24KA6 User manual

SERVICE MANUAL
Notes:
This manual describes service
data of the indoor units only.
RoHS compliant products
have <G> mark on the spec
name plate.
CONTENTS
1. REFERENCE MANUAL...................................2
2. SAFETY PRECAUTION................................... 3
3. PARTS NAMES AND FUNCTIONS................. 4
4. SPECIFICATIONS...........................................10
5. NOISE CRITERION CURVES.........................11
6. OUTLINES AND DIMENSIONS......................12
7. WIRING DIAGRAM......................................... 13
8. REFRIGERANT SYSTEM DIAGRAM............ 14
9. TROUBLESHOOTING....................................15
10. SPECIAL FUNCTION..................................... 29
11. DISASSEMBLY PROCEDURE....................... 32
PARTS CATALOG (OCB584)
No. OCH584
December 2014
WIRED REMOTE
CONTROLLER
(Option)
INDOOR UNIT
Indoor unit
[Model Name] [Service Ref.]
PKA-A24KA6
PKA-A24KA6.TH
PKA-A30KA6
PKA-A30KA6.TH
PKA-A36KA6
PKA-A36KA6.TH
IR WIRELESS REMOTE
CONTROLLER
(Option)
ON/OFF TEMP
SPLIT-SYSTEM HEAT PUMP

2
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
Radio frequency interface Wired remote controller IR wireless remote controller
COOL
DRY
AUTO
FAN
HEAT
RF thermostat
Remote controller (Optional parts)
Model Name Service Ref. Service Manual No.
PUZ-A18/24/30/36NHA6
PUZ-A18/24/30/36NHA6-BS
PUZ-A18/24/30/36NHA6
PUZ-A18/24/30/36NHA6-BS OCH577
OCB577
PUY-A12/18/24/30/36NHA6
PUY-A12/18/24/30/36NHA6-BS
PUY-A12/18/24/30/36NHA6
PUY-A12/18/24/30/36NHA6-BS
PUZ-HA30/36NHA2 PUZ-HA30/36NHA2 OCH426/OCB426
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3
SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R410A
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
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.
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
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
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 hazards 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.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
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.
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply
circuits must be disconnected.
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4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
3PARTS NAMES AND FUNCTIONS
Indoor unit
Emergency operation
switch
Front grille
Air inlet
Filter
Air outlet
Louver
Vane
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.
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 —
[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 stood vertically. (Refrigerant is charged from liquid phase.)
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5
Wired remote controller (Option)
Function buttons
432 1
5
6
789 0
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
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
ű1[ON/OFF] button
Press to turn ON/OFF the indoor unit.
ű2[SELECT] button
Press to save the setting.
ű3[RETURN] button
Press to return to the previous screen.
ű4[MENU] button
Press to bring up the Main menu.
ű5Backlit 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.
When the backlight is off, pressing any button turns the backlight on
and does not perform its function. (except for the [ON/OFF] button)
ű6ON/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.
ű7Function button [F1]
Main display: Press to change the operation mode.
Main menu: Press to move the cursor down.
ű8Function button [F2]
Main display: Press to decrease temperature.
Main menu: Press to move the cursor up.
ű9Function button [F3]
Main display: Press to increase temperature.
Main menu: Press to go to the previous page.
ű0Function button [F4]
Main display: Press to change the fan speed.
Main menu: Press to go to the next page.
Controller interface
78907890
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6
The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic” mode, change the
setting on the Main display setting. (Refer to operation manual included with remote controller.)
<Basic mode>
ű3
Appears when the On/Off timer, Night setback, or Auto-off timer func-
tion is enabled.
appears when the timer is disabled by the centralized control
system.
ű4
Appears when the Weekly timer is enabled.
ű5
Appears while the units are operated in the energy-save mode. (Will
not appear on some models of indoor units)
ű6
Appears while the outdoor units are operated in the silent mode.
ű7
Appears when the built-in thermistor on the remote controller is acti-
vated to monitor the room temperature (1).
appears when the thermistor on the indoor unit is activated to
monitor the room temperature.
ű8
Indicates the vane setting.
ű9
Indicates the louver setting.
ű)
Indicates the ventilation setting.
ű!
Appears when the preset temperature range is restricted.
ű1Operation mode
Indoor unit operation mode appears here.
ű2Preset temperature
Preset temperature appears here.
ű3Clock (See the Installation Manual.)
Current time appears here.
ű4Fan speed
Fan speed setting appears here.
ű5Button function guide
Functions of the corresponding buttons appear here.
ű6
Appears when the ON/OFF operation is centrally controlled.
ű7
Appears when the operation mode is centrally controlled.
ű8
Appears when the preset temperature is centrally controlled.
ű9
ű0
ű1Room temperature (See the Installation Manual.)
Current room temperature appears here.
ű2
Appears when the buttons are locked.
<Full mode>
* All icons are displayed for explanation.
Fri
Mode Temp. Fan
Room
Cool Set temp.
Fri
Cool
Mode Temp. Fan
Set temp.
4
3
2
1
5
6
7
8
90
1
3
9
4
)
!
2345 6 7 8 2
1
5
Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.
(Refer to operation manual included with remote controller.)
Display
Appears
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7
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
Auto descending panel
Menu structure
Filter Information
Error Information
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8
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.
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
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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 8VHWRFKHFNWKH¿OWHUVWDWXV
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 Auto descending panel Auto descending panel (Optional parts) Up / Down you can do.
Manual vane angle 8VHWRVHWWKHYDQHDQJOHIRUHDFKYDQHWRD¿[HGSRVLWLRQ
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 initial setting is "Full."
Contrast Use to adjust screen contrast.
Display details Make the settings for the remote controller related items as necessary.
Clock: The initial 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 Only Auto 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.
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 code: 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 Use to change the maintenance password.
Remote controller check When the remote controller does not work properly, use the remote controller checking function to trou-
blushoot the problem.
Main menu list
* Clock setting is required.
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9
IR wireless remote controller (Option)
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, heating, auto and fan mode.
CHECK-TEST RUN buttons
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.
buttons
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.
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.
TIMER CONTROL buttons
Note: In case the outdoor unit is cooling only type, the
heating and auto mode are not available.
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SPECIFICATIONS
4
A
A
kW
F.L.A
m3/min(CFM)
Pa(mmAq)
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
Service Ref.
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe I.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PKA-A24KA6.TH
1 phase, 60Hz, 208/230V
15
1
White Munsell 1.0Y 9.2/0.2
Plate fin coil
Line flow fan (direct) × 1
0.056
0.36
Dry: 18-20-22 (635-705-775)
Wet: 16-18-20 (570-635-700)
0(direct blow)
Remote controller & built-in
39-42-45
16(5/8)
1170 (46-1/16)
295 (11-5/8)
365 (14-3/8)
21 (46)
1 phase, 60Hz, 208/230V
15
1
Plate fin coil
0(direct blow)
Remote controller & built-in
A
A
kW
F.L.A
K/min(CFM)
Pa(mmAq)
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
Service Ref.
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe I.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PKA-A30KA6.TH
White Munsell 1.0Y 9.2/0.2
0.056
0.36
16(5/8)
Line flow fan (direct) × 1
Dry: 18-20-22 (635-705-775)
Wet: 16-18-20 (570-635-700)
39-42-45
1170 (46-1/16)
295 (11-5/8)
365 (14-3/8)
21 (46)
A
A
kW
F.L.A
m3/min(CFM)
Pa(mmAq)
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
Service Ref.
Power supply(phase, cycle, voltage)
Max. Fuse Size
Min.Circuit Ampacity
External finish
Heat exchanger
Fan Fan(drive) oNo.
Fan motor output
Fan motor
Airflow(Low-Middle-High)
External static pressure
Operation control & Thermostat
Noise level(Low-Middle-High)
Field drain pipe I.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PKA-A36KA6.TH
1 phase, 60Hz, 208/230V
15
1
White Munsell 1.0Y 9.2/0.2
Plate fin coil
Line flow fan (direct) × 1
0.056
0.57
Dry: 20-23-26 (705-810-920)
Wet: 18-21-23 (635-730-830)
0(direct blow)
Remote controller & built-in
43-46-49
16(5/8)
1170 (46-1/16)
295 (11-5/8)
365 (14-3/8)
21 (46)
OCH584