Mitsubishi Electric PKA-A18HA6 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
Indoor unit
[Model Name] [Service Ref.]
PARTS CATALOG (OCB580)
INDOOR UNIT
PKA-A12HA6
PKA-A12HA6
PKA-A18HA6
PKA-A18HA6
WIRED REMOTE
CONTROLLER
(Option)
IR WIRELESS REMOTE
CONTROLLER (Option)
December 2014
No. OCH580
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
SPLIT-SYSTEM HEAT PUMP

2
3
1REFERENCE MANUAL
1-1. OUTDOOR UNIT SERVICE MANUAL
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
Radio frequency interface Wired remote controller IR wireless remote controller
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
RF thermostat
Remote controller (Optional parts)
OCH580

3
SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R410A
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply
circuits must be disconnected.
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.
[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.
OCH580

4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
3PARTS NAMES AND FUNCTIONS
Indoor unit
Filter Air intake
Louver Air outlet 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 —
[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.)
OCH580

5
Wired remote controller (Option)
Function buttons
4 3 2 1
5
6
7 8 9 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
▌1[ON/OFF] button
Press to turn ON/OFF the indoor unit.
▌2[SELECT] button
Press to save the setting.
▌3[RETURN] button
Press to return to the previous screen.
▌4[MENU] 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.
When the backlight is off, pressing any button turns the backlight on
and does not perform its function. (except for the [ON/OFF] button)
▌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.
Controller interface
7 8 9 07 8 9 0
OCH580

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>
▌3
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.
▌4
Appears when the Weekly timer is enabled.
▌5
Appears while the units are operated in the energy-save mode. (Will
not appear on some models of indoor units)
▌6
Appears while the outdoor units are operated in the silent mode.
▌7
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.
▌8
Indicates the vane setting.
▌9
Indicates the louver setting.
▌)
Indicates the ventilation setting.
▌!
Appears when the preset temperature range is restricted.
▌1Operation mode
Indoor unit operation mode appears here.
▌2Preset temperature
Preset temperature appears here.
▌3Clock (See the Installation Manual.)
Current time appears here.
▌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
▌0
▌1Room temperature (See the Installation Manual.)
Current room temperature appears here.
▌2
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
)
!
2 3 4 5 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
OCH580

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
OCH580

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
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 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 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.
OCH580

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
OCH580

10
11
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 O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PKA-A12HA6
1 phase, 60 Hz, 208/230 V
15
1
White Munsell 1.0Y 9.2/0.2
Plate fin coil
Line flow fan (direct) o1
0.030
0.33
Dry: 9-10.5-12 (320-370-425)
Wet: 8-9.5-11 (290-335-380)
0(direct blow)
Remote controller & built-in
36-40-43
16(5/8)
898 (35-3/8)
249 (9-13/16)
295 (11-5/8)
13 (29)
1 phase, 60 Hz, 208/230 V
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)
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 O.D.
Dimensions
Weight
W
D
H
INDOOR UNIT
PKA-A18HA6
White Munsell 1.0Y 9.2/0.2
0.030
0.33
Dry: 9-10.5-12 (320-370-425)
Wet: 8-9.5-11 (290-335-380)
36-40-43
16(5/8)
898 (35-3/8)
249 (9-13/16)
295 (11-5/8)
13 (29)
Line flow fan (direct) o1
mm (in)
OCH580

11
5NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0dB=0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
PKA-A12HA6
PKA-A18HA6 High
NOTCH
Low
43
SPL(dB)
36
LINE
UNIT
WALL
3.3ft
3.3ft
MICROPHONE
OCH580

12
13
OUTLINES AND DIMENSIONS
6
PKA-A12HA6 PKA-A18HA6 Unit: in (mm)
1/2F ( [ 12.7)
1/4F (
[ 6.35)
Refrigerant
Piping
Drain hose
Gas pipe
Liquid pipe
[2-1/2~[3-1/8
([65~[80)
[2-1/2~[3-1/8
([65~[80)
Through hole
Sleeve
(purchased locally)
Center measurement hole [3/32( [ 2.5)
5/32(3.8)
2-1/4(58) 0
Wall hole for
left rear piping
Knock out hole for
left rear piping
2-3/4×12-3/16(70×310)
Wall hole for
right rear piping
77-
[ 3/16( [ 5.1)
Tapping
screw hole
4- [ 5/16( [ 9)
Bolt hole Mount board
Indoor unit outline
0
5/8(16)
9-15/16(253.5)
9-1/8(232.5)
1-1/16(28.5)
1-9/16(41)
3-1/16(78.5)
4-1/16(103.5)
4-9/16(116)
6-1/2(166)
7(178.5)
8(203.5)
3-9/16(91)
13/16(21.8)
9-1/16(231.5)
10-3/4(273.2)
0
1-1/4(32.7)
2-9/16(66)
2-1/16(53.5)
5(128.5)
6(153.5)
3/4(20)
9/16(15)
14-5/8(372.3) 14(356.3) 12-7/8(237.5) 11-7/16(291.5) 10-3/8(265) 9-5/16(238) 8-13/16(225) 7-13/16(200)
4-7/8(125)
2-3/4(70)
9/16(15)
14-5/8(372.3) 14(356.3) 12-7/8(327.5) 10-3/8(265) 11-7/16(291.5) 7-13/16(200) 8-13/16(225) 4-7/8(125) 2-3/4(70) 0
17-5/8(449)
7-9/16(193.5)
7-1/16(180.3)
6-9/16(167)
5-1/2(140)
4-1/2(115)
6-13/16(174)
8-3/8(213)
9-5/16(238)
10-15/16(278.3)
15-1/2(394)
11-1/16(281)
17-5/8(449)
0
Emergency operation switch
(cooling/heating)
Terminal block for
MA-remote controller
Terminal block for power supply (option)
Front side(Grille open)
Terminal block for indoor/outdoor
connecting line
17-15/16(457)Gas pipe
21-3/16(539)Liquid pipe
6-5/8(169)
6-3/16(158)
Drain hose
7-3/16(184)
250mm,9-13/16inch or greater with optional drain pump installation.
Required space(Indoor unit)
(mm)
Air inlet
Air inlet
Air outlet
Min.1-31/32(50)
Min.9-13/16(250)
Min.5-7/8(150)
Min.8-5/8
(220)
Min.1-31/32(50)
Min.1/4(7)
Knock out hole for piping
D
2-3/16(56)
2-11/16(69)
3/16(6)
1-11/16(43)
C
2-3/16(56)7/16(12.5)
1-11/16(43)
B
1-3/4(46)
2-5/16(60)
2-5/16(59)
1-11/16(43)
A
1-11/16(43)
1-3/4(46)
2-3/16(56)
3/16(6)
A
Knock out hole
for right piping
Right side
Mount board
3/16(5)9-13/16(249)
Top side
15-3/16(387) 7-1/2(192)
7-3/4(197)
23-9/16(599)
CB
Operation lamp DEFROST/STAND BY lamp
Receiver
Louver(manual)
Vane(auto)
Knock out hole
for lower piping
Knock out hole
for lower piping
Under side
5/16(8)
24-1/16(612)
D
Knock out hole
for left piping
Left side
Front side
6-1/16(155)
2-1/8
(55)
27-1/16(688)
11-5/8(295)
35-3/8(898)
[ 5/8 ( [ 16) O.D
Effective length: 15-3/4 (400)
OCH580

13
WIRING DIAGRAM
7
PKA-A12HA6 PKA-A18HA6
The black square (■ )indicates
a switch position.
Notes:
1. SymboIs used in wiring diagram above are, : Connector, :: Terminal (block).
2. Indoor and outdoor connecting wires have poIarities, make sure to match terminal numbers (S1, S2, S3)for correct wirings.
3. Since the outdoor side electric wiring may change, be sure to check the outdoor unit electric wiring diagram for servicing.
4. This diagram shows the wiring of indoor and outdoor connecting wires. (specification of 230V), adopting superimposed
system of power and signal.
1 : Use copper supply wires.
Utilisez des fils d,alimentation en cuivre.
Refer to
tables
1and 2
CN90
(WHT)
CN2L
(RED)
CN151
(WHT)
CN20
(RED)
CN105
(RED)
CN44
(WHT)
CN4F
(WHT)
CN22
(BLU)
CN41
(WHT)
CN51
(WHT)
CN32
(WHT)
CNMF
(WHT)
S.W
SWE
R.B
CNP(BLU)
CN3C
(BLU)
LDSWE(A)
(BLU)
LDSWE(B) SWE2
CN01
(BLK)
DB1
X1
FUSE
I.B
1
1
1 1 1 54
1 1 1
2
1 4 1 4 1 525
TH1 TH2 TH5
2
11 39
CN152
(WHT)
CN30
(BLK)
11 310
3
3
3
2
2
1
2
1
1
1
5
6
3
Mt
○
t
○
t
○
MS
3~
TB4
TB5
S1
S2
S3
ORN
ORN ORN
BRN
LED1
LED3
LED2
TB6
ON
OFF
TO
OUTDOOR
UNIT
YLWYLW
BLK
<Table 1>
SW1
(MODEL SELECTION)
SETTING
SETTING
ON
OFF
1 2 3 4 5
<Table 2>
SW2(CAPACITY CODE)
MODELS
PKA-
A12HA6
PKA-
A18HA6
ON
OFF
12345
ON
OFF
12345
W.B
RFI
CNRU
(WHT) LD101(B) REC1
LED1 LED2
6
2
5
RU
Symbol Name Symbol Name
I.B Indoor controller board
FUSE FUSE(T3.15AL250V)
RFI Radio frequency interface for RF thermostat
CN2L Connector (LOSSNAY)
CN30 Connector (LLC)
CN105 Connector (Radio frequency interface)
CN152 Connector (Back-up heating)
CN90 Connector (Remote operation adapter)
Connector (Emergency operation)
CN32 Connector ( Remote switch)
CN41 Connector (HA terminal-A)
CN51 Connector (Centrally control)
LED1 Power supply (I.B)
LED2 Power supply (R.B)
LED3 Transmission (Indoor-outdoor)
SW1 Switch (Model selection) See table 1
SW2
SWE
Switch (Capacity code) See table 2
[Explanation of symbols]
MS Fan motor
W.B Pcb for IR wireless remote controller
Switch board
SWE2 Emergency operation
M Vane motor
LED1 LED (Operation indication : Green)
REC1 Receiving unit
LED2 LED (Preparation for heating: Orange)
TB2 Terminal block(Indoor unit Power (option))
TB4 Terminal block (Indoor/outdoor connecting line)
TB5 Terminal block (Remote controller transmission line)
TH1 Room temp. Thermistor
Pipe temp. Thermistor/liquid
Cond./eva. temp. Thermistor
(32˚F/15ΚΩ, 77˚F/5.4ΚΩ Detect)
(32˚F/15ΚΩ, 77˚F/5.4ΚΩ Detect)
(32˚F/15ΚΩ, 77˚F/5.4ΚΩ Detect)
TH2
TH5
S.W
R.B
OPTION PART
Wired remote controller board
TB6 Terminal block (Remote controller transmission line)
OCH580

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15
REFRIGERANT SYSTEM DIAGRAM
8
Thermistor TH2
Pipe temperature(Liquid)
Distributor
with strainer (#50/#50)
Thermistor TH5
(Cond./ Eva.temperature)
Thermistor TH1
(Room temperature)
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer (#50)
Strainer (#50)
Heat exchanger
Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
PKA-A12HA6 PKA-A18HA6
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15
TROUBLESHOOTING
9
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the wired remote controller and control board of out-
doorunit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
9-1. TROUBLESHOOTING
Unit conditions at service Check code Actions to be taken for service (summary)
The trouble is reoccurring.
Displayed
Not displayed
Judge what is wrong and take a corrective action
according to “9-3. SELF-DIAGNOSIS ACTION TABLE”.
Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA”.
The trouble is not reoccurring.
Logged
Not logged
1Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
2
Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical component,
controller board,remote controller, etc.
1Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA”.
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
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[Procedure]
1. Press the CHECK button twice.
2. Press the TEMP buttons.
3. Point the remote controller at the
sensor on the indoor unit and
press the HOUR button.
4. Point the remote controller at the
sensor on the indoor unit and
press the ON/OFF button.
ON/OFF TEMP
FAN
VANE
MODE
CHECK
LOUVER
TEST RUN
AUTO STOP
AUTO START
h
min
RESET
SET CLOCK
CHECK
CHECK
display
Temperature
button
CHECK
button
Refrigerant
address
display
HOUR
button
ON/OFF
button
<Malfunction-diagnosis method at maintenance service>
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
<In case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.
•"CHECK" lights, and refrigerant
address "00" blinks.
•Check that the remote controller's
display has stopped before continuing.
•Select the refrigerant address of the
indoor unit for the self-diagnosis.
Note: Set refrigerant address using the
outdoor unit’s DIP switch (SW1).
(For more information, see the
outdoor unit installation manual.)
•If an air conditioner error occurs, the
indoor unit's sensor emits an intermit-
tent buzzer sound, the operation lamp
blinks, and the check code is
output.
(It takes 3 seconds at most for check
code to appear.)
•The check mode is cancelled.
■IR wireless remote controller
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[Output pattern A] Errors detected by indoor unit
[Output pattern B]
E9
1.If the beeper does not sound again after the initial
2 beeps to confirm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on,
there are no error records.
2.If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 seconds)” after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
OPERATION
INDICATOR
lamp blink
pattern
peeBpeeBpeeBpeeBpeeB Beep Beep
Off
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
Off
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1
st
2
nd
3
rd
1
st
2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
[Output pattern B]
OPERATION
INDICATOR
lamp blink
pattern
Beep Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
Off
Approx. 2.5 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1
st
2
nd
3
rd
1
st
2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
•Refer to the following tables for details on the check codes.
[Output pattern A]
Beeper sounds/OPERATION
INDICATOR lamp blinks Check code krameRmotpmyS
(Number of times)
IR wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks Check code
(Number of times)
IR wireless remote controller
Wired remote controller
1 P1 Intake sensor error
P9 Pipe (TH5) sensor error
2P2 Pipe (TH2) sensor error
3 E6,E7 Indoor/outdoor unit communication error
4 P4 Float switch connector (CN4F) open
5P5
PA
Drain pump error
Forced compressor stop(due to water leakage abnormality)
6 P6 Freezing/Overheating protection operation
7 EE Communication error between indoor and outdoor units
8 P8 Pipe temperature error
9 E4, E5 Remote controller signal receiving error
10
–
11
–
–
–
Errors detected by unit other than indoor unit (outdoor unit, etc.)
krameRmotpmyS
1Indoor/outdoor unit communication error
2
(Transmitting error) (Outdoor unit)
3Open/short of outdoor unit thermistors
4Compressor overcurrent interruption (When compressor locked)
5Abnormal high discharging temperature/49C operated/
insufficient refrigerant
6Abnormal high pressure (63H operated)/Overheating
protection operation
7Abnormal temperature of heatsink
8Outdoor unit fan protection stop
9Compressor overcurrent interruption/Abnormal of power module
10 Abnormality of superheat due to low discharge temperature
11 Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
12
13
U2
U5
UP
U3,U4
UF
U1,Ud
U8
U6
U7
U9,UH
Others
–
–
–
–
14 Other errors (Refer to the technical manual for the outdoor unit.)
For details, check
theLED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.
12 Fb Indoor unit control system error (memory error, etc.)
–E0, E3
– E1, E2 Remote controller control board error
Remote controller transmission error
Compressor overcurrent interruption
14 PL Abnormality of refrigerant circuit
Notes:
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•If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.
Symptom Cause
Wired remote controller LED 1, 2 (PCB in outdoor unit)
On the IR wireless remote controller with condition above, following phenomena take place.
•No signals from the remote controller can be received.
•OPE lamp is blinking.
•The buzzer makes a short ping sound.
PLEASE WAIT
PLEASE WAIT Check code
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
For about 2
minutes after
power-on
Subsequent to
about 2 minutes
after power-on
After LED 1, 2 are lighted, LED 2 is
turned off, then only LED 1 is
Only LED 1 is lighted.
LED 1, 2 blink.
Only LED 1 is lighted.
LED 1 blinks twice,
LED 2 blinks once.
•For about2minutes following power-on, op-
eration of the remote controller is notpossible
due tosystemstart-up. (Correct operation)
•Connector for the outdoor unit’s protection
deviceis not connected.
•Reverse oropen phase wiring for theoutdoor
unit’s power terminal block (L1, L2, GR)
•Incorrect wiring between indoor and outdoor
units(incorrect polarity of S1, S2, S3)
•Remote controller wire short
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
LED1 (power for microprocessor) Indicates whether control power is supplied. Make sure that this LED is
always lit.
LED2 (power for wired remote controller) Indicates whether power is supplied to the wired remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant addresses “0”.
LED3 (communication between indoor and
outdoor units)
Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.
lighted. (Correct operation)
•On IR wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
•On wired remote controller
Check code displayed in the LCD. (Refer to the previous page, check code.)
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9-3. SELF-DIAGNOSIS ACTION TABLE
Note:
Errors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7),
are not covered in this document. Please refer to the outdoor unit service manual for the details.
Check code Abnormal point and detection method Cause Countermeasure
P1
P2
Room temperature thermistor (TH1)
1 The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 min-
utes. (The unit returns to normal opera-
tion, if it has been reset normally.)
2 Constantly detected during cooling,
drying, and heating operation.
Short: 194°F [90:] or more
Open: −40°F [−40:] or less
1 Defective thermistor
characteristics
2 Contact failure of connector
(CN20) on the indoor controller
board (Insert failure)
3 Breaking of wire or contact
failure of thermistor wiring
4 Defective indoor controller
board
1–3 Check resistance value of thermistor.
32°F [0:] ....15.0 k"
50°F [10:] ......9.6 k"
68°F [20:] ......6.3 k"
86°F [30:] ......4.3 k"
104°F [40:] ......3.0 k"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermis-
tor, breaking of wire or contact failure can be
detected.
2 Check contact failure of connector (CN20)
on the indoor controller board. Refer to "9-7.
TEST POINT DIAGRAM".
Turn the power on again and check restart
after inserting connector again.
4 Check room temperature display on remote
controller.
Replace indoor controller board if there is
abnormal difference with actual room
temperature.
Turn the power off, and on again to operate
after check.
Pipe temperature thermistor/Liquid (TH2)
1 The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 min-
utes. (The unit returns to normal opera-
tion, if it has been reset normally.)
2 Constantly detected during cooling,
drying, and heating (except defrosting)
operation
Short: 194°F [90:] or more
Open: −40°F [−40:] or less
Note:
When all of the following conditions are sat-
isfied, the error is not detected:
1) During cooling operation, or for 3 min-
utes after cooling operation is stopped.
2) Up to 16 minutes from 10 seconds after
cooling operation is started.
3) Outside temperature < −22°F [−30:]
1 Defective thermistor
characteristics
2 Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
3 Breaking of wire or contact
failure of thermistor wiring
4 Defective refrigerant circuit is
causing thermistor temperature
of 194°F [90:] or more, or
−40°F [−40:] or less.
5 Defective indoor controller
board
1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN44)
on the indoor controller board. Refer to "9-7.
TEST POINT DIAGRAM".
Turn the power on and check restart after
inserting connector again.
4 Check pipe <liquid> temperature with remote
controller in test run mode. If pipe <liquid>
temperature is extremely low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defective.
5 Check pipe <liquid> temperature with
remote controller in test run mode. If there is
extremely difference with actual pipe <liquid>
temperature, replace indoor controller board.
Turn the power off, and on again to operate
after check.
P4
Contact failure of drain float switch
(CN4F)
• Extract when the connector of drain float
switch is disconnected.
(3 and 4 of connector CN4F is not
short-circuited.)
• Constantly detected during operation
1 Contact failure of connector
(Insert failure)
2 Defective indoor controller
board
1 Check contact failure of float switch connector.
Turn the power on again and check after insert-
ing connector again.
2 Operate with connector (CN4F) short-circuited.
Replace indoor controller board if abnormality
reappears.
P5
Drain over flow protection operation
1 Suspensive abnormality, if drain float
switch is detected to be underwater for
1 minute and 30 seconds continuously
with drain pump on.
Compressor and indoor fan will be
turned off.
2 Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.
3 Constantly detected during drain pump
operation
1 Malfunction of drain pump
2 Defective drain
Clogged drain pump
Clogged drain pipe
3 Defective drain float switch
Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)
4 Defective indoor-controller
board
1 Check if drain-up machine works.
2 Check drain function.
3 Remove drain float switch connector CN4F
and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN
with the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.
4 Replace indoor controller board if it is short-
circuited between 3–4 of the drain float
switch connector CN4F and abnormality
reappears.
It is not abnormal if there is no problem about
the above-mentioned 1–4.
Turn the power off, and on again to operate
after check.
OCH580

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Check code Abnormal point and detection method Cause Countermeasure
P6
Freezing/overheating protection is work-
ing
1 Freezing protection (Cooling mode)
• In case when
outside temperature > −4°F [−20:]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−5°F [−15:] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −5°F [−15:]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
• In case when
outside temperature [ −4°F [−20:]
The unit is in 6-minute resume preven-
tion mode if pipe <liquid or condenser/
evaporator> temperature stays under
−31°F [−35:] for 3 minutes, 3 minutes
after the compressor started.
Abnormal if it stays under −31°F [−35:]
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.
2 Overheating protection (Heating mode)
The unit is in 6-minute resume
prevention mode if pipe <liquid or con-
denser/evaporator> temperature is
detected as over 158°F [70:] after the
compressor started. Abnormal if the tem-
perature of over 158°F [70:] is detected
again within 30 minutes after 6-minute
resume prevention mode.
P8
1 Slight temperature difference
between indoor room
temperature and pipe <liquid
or condenser/evaporator>
temperature thermistor
• Shortage of refrigerant
• Disconnected holder of pipe
<liquid or condenser/
evaporator> thermistor
• Defective refrigerant circuit
2 Converse connection of
extension pipe (on plural units
connection)
3 Converse wiring of indoor/
outdoor unit connecting wire
(on plural units connection)
4 Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
5 Stop valve is not opened
completely.
(Cooling or drying mode)
1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Low-load (low temperature)
operation out of the tolerance
range
4 Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit
(clogs)
(Heating mode)
1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Over-load (high temperature)
operation out of the tolerance
range
4 Defective indoor fan motor
• Fan motor is defective.
• Indoor controller board is defec-
tive.
5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit
(clogs)
8 Bypass circuit of outdoor unit is
defective.
(Cooling or drying mode)
1 Check clogs of the filter.
2 Remove shields.
4 Refer to "9-6. HOW TO CHECK THE
PARTS".
5 Check outdoor fan motor.
67 Check operating condition of refrigerant
circuit.
(Heating mode)
1 Check clogs of the filter.
2 Remove shields.
4 Refer to "9-6. HOW TO CHECK THE
PARTS".
5 Check outdoor fan motor.
6–8Check operating condition of refrigerant
circuit.
Pipe temperature
<Cooling mode>
Detected as abnormal when the pipe tem-
perature is not in the cooling range 3 min-
utes after compressor start and 6 minutes
after the liquid or condenser/evaporator
pipe is out of cooling range.
Note 1: It takes at least 9 minutes to
detect.
Note 2: Abnormality P8 is not detected in
drying mode.
Cooling range: −5.4°F [−3°C] ] (TH−TH1)
TH: Lower temperature between liquid pipe
temperature (TH2) and condenser/
evaporator temperature (TH5)
TH1: Intake temperature
<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in heat-
ing range within 20 minutes.
Note 3: It takes at least 27 minutes to
detect abnormality.
Note 4: It excludes the period of defrosting.
(Detection restarts when defrosting
mode is over.)
Heating range: 5.4°F [3°C] [ (TH5−TH1)
1–4 Check pipe <liquid or condenser/evapora-
tor> temperature with room temperature
display on remote controller and outdoor
controller circuit board.
Pipe <liquid or condenser/evaporator>
temperature display is indicated by set-
ting SW2 of outdoor controller circuit
board as follows.
23Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.
Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool(PAC-SK52ST)’.
()
OCH580