Mitsubishi Heavy Industries SRK50HE-S1 User manual

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3
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WALL MOUNTED TYPE ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
SRK50HE-S1, SRK56HE-S1
SRK63HE-S1, SRK71HE-S1
Manual No. ’06
.
SRK-T
.
050
updated September 29, 2009

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137
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( )
2.2 SRK50HE-S1
SRK56HE-S1 .........................................................176
2.3 SRK63HE-S1
SRK71HE-S1 .........................................................211
2. WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
Split system, air to air
heat pump type

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176
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CONTENTS
2.2.1 GENERAL INFORMATION ...................................................................... 177
(1) Specific features................................................................................... 177
(2) How to read the model name .............................................................. 177
2.2.2 SELECTION DATA ................................................................................... 178
(1) Specifications ....................................................................................... 178
(2) Range of usage & limitations .............................................................. 180
(3) Exterior dimensions ............................................................................. 180
(4) Piping system ....................................................................................... 181
(5) Selection chart...................................................................................... 182
2.2.3 ELECTRICAL DATA ................................................................................. 183
(1) Electrical wiring .................................................................................... 183
2.2.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER............ 184
(1) Operation control function by remote control switch ...................... 184
(2) Unit ON/OFF button .............................................................................. 185
(3) Power blackout auto restart function ................................................. 185
(4) Custom cord switching procedure ..................................................... 186
(5) Flap control ........................................................................................... 186
(6) Comfortable timer setting.................................................................... 187
(7) Outline of heating operation ............................................................... 187
(8) Outline of cooling operation ............................................................... 190
(9) Outline of dehumidifying operation.................................................... 191
(10) Outline of automatic operation ........................................................... 192
(11) Outline of fan operation ....................................................................... 192
(12) Protective control function.................................................................. 193
2.2.5 APPLICATION DATA ............................................................................... 195
(1) Selection of location for installation .................................................. 196
(2) Installation of indoor unit .................................................................... 197
(3) Installation of outdoor unit .................................................................. 200
(4) Refrigerant piping ................................................................................ 200
(5) Test run.................................................................................................. 201
(6) Precautions for wireless remote controller installation and
operation ............................................................................................... 202
2.2.6 MAINTENANCE DATA ............................................................................. 203
(1) Troubleshooting procedures for electrical equipment ..................... 203
(2) Servicing ............................................................................................... 210
2.2.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL
FOR AIR CONDITIONERS USING R410A .............................................. 210

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177
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Error of signal transmission
2.2.1 GENERAL INFORMATION
(1) Specific features
The “MITSUBISHI HEAVY INDUSTRIES, LTD.” room air-conditioner: SRK series are of split and wall mounted type and the unit
consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or
heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.
(a) Remote control flap
The flap can be automatically controlled by operating wireless remote controller.
¡Air scroll: Flap operation is automatically control.
¡Swing: This will swing the flap up and down.
¡Memory flap: Once the flap position is set, the unit memorizes the position and continues to operate at the same position from
the next time.
(b) Automatic operation
When the remote control switch is set on “auto( ) ”, it will either automatically decide operation mode such as cooling, heating
and thermal dry, or operate in the operation mode before it has been turned to automatic control.
(c) Self diagnosis function
¡We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as
follows.
(2) How to read the model name
Example : SR K 50 H E - S1
Room temperature sensor error
Indoor fan motor error
Heat exchanger sensor error
2 time flash
6 time flash
TIMER light
ON
1 time flash
Outdoor unit heat exchanger
sensor error
Discharge pipe sensor error
Outdoor temperature sensor error
2 time flash
4 time flash
RUN light
keeps flashing
1 time flash
OFF
OFF
OFF
Over heat of compressor
5 time flash
RUN light
ON
5 time flash
6 time flash 6 time flash
RUN light TIMER light Outdoor (LED)
R410A models
Series No.
Heat pump type
Product capacity
Wall mounted type
Split type room air-conditioner
2 time flash OFF Abnormality of outdoor unit

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Item
Model SRK50HE-S1 SRC50HE-S1
Cooling capacity(1) W4700
Heating capacity(1) W5300
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 1.41
Running current (Cooling) A 6.5/6.3/6.0
Heating input kW 1.40
Running current (Heating) A 6.5/6.2/6.0
Inrush current A 39.6
COP Cooling: 3.33 Heating: 3.79
Cooling Sound level Hi 43, Me 39, Lo 34 47
Noise level Power level dB 58 63
Heating Sound level Hi 44, Me 39, Lo 35 49
Power level 61 64
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 640 ×850 ×290
Color Cool white Stucco white
Net weight kg 12 44
Refrigerant equipment
Compressor type & Q’ty –RM-B5118MNE5 (Rotary type) ×1
Motor kW –1.4
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.4 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.7 (MA68)
Deice control Microcompter control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 27 35
(Cooling) 10.0 38.0
Air flow (at High) (Heating) CMM 12.5 38.0
Air filter, Q’ty Polypropylene net (washable) ×2–
Shock & vibration absorber –Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote controller –
Room temperature control Microcomputer thermostat –
Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)
Safety equipment
O.D mm (in) Liquid line: φ6.35 (1/4″)Gas line: φ12.7 (1/2″)
Connecting method Flare Connection
Attached length of piping Liquid line: 0.54 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with earth)
Size ×Core number 1.5 mm2×4 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit, Clean filter (Natural enzyme filter ×1, Photocatalytic washable deodorizing filter ×1)
Optional parts –
Notes (1) The data are measured at the following conditions.
2.2.2 SELECTION DATA
(1) Specifications
Model SRK50HE-S1 (Indoor unit)
SRC50HE-S1 (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
(2) The operation data are applied to the 220/230/240V districts respectively.
(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.
(Purging is not required even for the short piping.)
If the piping length is longer, when it is 15 to 25 m, add 20 g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
Compressor: Overheat protection, Serial signal error protection, Indoor fan motor error protection, Frost
protection
The piping length is 7.5m.
(220/230/240V)

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Item
Model SRK56HE-S1 SRC56HE-S1
Cooling capacity(1) W5100
Heating capacity(1) W5800
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 1.59
Running current (Cooling) A 7.3/7.1/6.8
Heating input kW 1.58
Running current (Heating) A 7.4/7.1/6.8
Inrush current A 45.2
COP Cooling: 3.21 Heating: 3.67
Cooling Sound level Hi 44, Me 40, Lo 35 49
Noise level Power level dB 59 64
Heating Sound level Hi 44, Me 39, Lo 35 51
Power level 61 65
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 640 ×850 ×290
Color Cool white Stucco white
Net weight kg 12 44
Refrigerant equipment
Compressor type & Q’ty –RM-B5120MNE5 [Rotary type] ×1
Motor kW –1.5
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.4 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.7 (MA68)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 27 35
(Cooling) 11.0 38.0
Air flow (at High) (Heating) CMM 12.5 38.0
Air filter, Q’ty Polypropylene net (washable) × 2 –
Shock & vibration absorber –Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote controller –
Room temperature control Microcomputer thermostat –
Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)
Safety equipment
O.D mm (in) Liquid line: φ6.35 (1/4″)Gas line: φ12.7 (1/2″)
Connecting method Flare connection
Attached length of piping Liquid line: 0.54 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with earth)
Size ×Core number 1.5 mm2×4 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit, Clean filter (Natural enzyme filter ×1, Photocatalytic washable deodorizing filter ×1)
Optional parts –
Notes (1) The data are measured at the following conditions.
Model SRK56HE-S1 (Indoor unit)
SRC56HE-S1 (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
(2) The operation data are applied to the 220/230/240V districts respectively.
(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.
(Purging is not required even for the short piping.)
If the piping length is longer, when it is 15 to 25 m, add 20 g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
Compressor: Overheat protection, Serial signal error protection, Indoor fan motor error protection,
Frost protection
The piping length is 7.5m.
(220/230/240V)

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(2) Range of usage & limitations
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length Max. 25m
All models
Cooling operation : Approximately 21 to 32˚C
Heating operation : Approximately 15 to 30˚C
Cooling operation : Approximately 21 to 43˚C
Heating operation : Approximately -5 to 21˚C
Power source voltage Rating ±10%
Voltage at starting Min. 85% of rating
Frequency of ON-OFF cycle Max. 10 times/h
ON and OFF interval Max. 3 minutes
Outdoor air temperature
(Upper, lower limits)
Vertical height difference between
outdoor unit and indoor unit
Max. 15m (Outdoor unit is higher)
Max. 15m (Outdoor unit is lower)
Item
Models
(3) Exterior dimensions
(a) Indoor unit
Models All models
Unit: mm
840
298
A
Piping hole right
259
9
44
right: 67 left : 60
3
60
60 14.5
813
603
44
44
60
60
VIEW A
44.5
47.5220.5
50
207.5
73.5
53.5
Piping hole (ø65) Piping hole (ø65)
Indoor unit
Installating board
Drain hose 515 (ø16)
Piping for gas 533.5 (ø12.7)
Piping for liquid 603.5 (ø6.35)
63.5
8.5
5.3 284.2
44.5
73.5
182.5
50
450
693
25

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(b) Outdoor unit
Models All models
Drain holes
286.4
12
50
290
49.6 43.5
850
203.1 510 136.9
476
Elogated hole
(2-12 x16)
314 12
328
Terminal block
Service valve (Liquid)
ø6.35 (1/4'')
Service valve (Gas)
ø12.7 (1/2'')
Ground
terminal
124 34.6
20˚
20˚
42.7
100.3
15
640
14
(4) Piping system
Models SRK50HE-S1, 56HE-S1
Outdoor unitIndoor unit
Heat
exchanger
Room temp.
sensor
Heat
exchanger
Flare connection
Heat
exchanger
sensor
Piping
(Liquid)
ø6.35
Check joint
4 way valve
Service valve (Liquid)
Flare connection
Discharge pipe
temp. sensor
Cooling cycle
Heating cycle Outdoor air
temp. sensor
Heat exchanger
sensor
Compressor
Capillary tube
Strainer
Accumulator
Service valve
(Gas)
Electronic
expansion valve
Piping
(Gas)
ø12.7
Capillary tube

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182
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(5) Selection chart
Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be
obtained in the following way.
Net capacity = Capacity shown on specification ✕ Correction factors as follows.
(a) Coefficient of cooling and heating capacity in relation to temperatures
(b) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor
units.
(c) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (a), (b) the heating capacity needs to be adjusted also with respect to the frosting on the
outdoor heat exchanger.
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SRK50HE-S1 with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C
and outdoor dry-bulb temperature 35˚C is Net cooling capacity = 4700 ✕ 0.975 ✕ 1.0 = 4583 W
SRK50HE-S1 Length 15m Factor by air
temperatures
15
ISO-T1 Standard ConditionOutdoor air W.B. temperature ˚C W.B.
1005-5
16 18 20 22 24
20
ISO-T1 Standard ConditionIndoor air W.B. temperature ˚C W.B.
Heating
Applicable range
27
25
20
15
21
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
Cooling
Heating operation
Indoor air D.B.
temperature
˚C D.B.
Cooling operation
Outdoor air D.B.
temperature
˚C D.B.
Coefficient of cooling & Heating capacity in relation to temperature
Air inlet temperature of
outdoor unit in ˚CWB
Adjustment coefficient
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
20
0.965
1.0
25
0.95
1.0

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2.2.3 ELECTRICAL DATA
(1) Electrical wiring
Models SRK50HE-S1, 56HE-S1
Power source
1 Phase 220-240V 50Hz
Outdoor unit
Indoor unit
HEAT EXCHANGER
Printed circuit board
Printed circuit board
BR LB Y/GN
BK
WH
RD
RD
1 3 4 5 6
CNU
BK
WH
Y
BL
TB TB
F 250V 3.15A
N
ZNR
CNM
CNE CNG
52C3
52C
52C4 JG
Th1 Th2
52C
52X
3
52X
2
52X
1
1 3
2N
1 3
( )
FM
I
SM
Display
Wireless R-Amp
2N
BK
WH
WH
RD
Y/GN
Y/GN
CNG
(250V 3.15A)
ZNR
G1
D.S
+-
~~
J N L
CM2
F
52X1
CM1
3
52X2 52X3 1
CNE
WH
RD
CC
WH
CM
BK
BK
51C
CNB CNU
20S
Th4 Th5 Th6
WV
U
5 3
FMo
WH
BK
CFO
OR
WH
EEV
RL
Black Brown Red Light Blue White
Yellow/Green
BK BR RD LB
WH
Yellow
Y
Orange
OR Y/GN
Color symbol
Meaning of marks Symbol Parts name
CM Compressor motor FFuse FM
I
Fan motor (Indoor)
FMo Fan motor (Outdoor)
SM Flap motor RL Inspection lamp
Symbol Parts name
Th
1
Room temp. sensor
Th
2
Heat exchanger sensor (Indoor unit)
Th
4
Heat exchanger sensor (Outdoor unit)
Th
5
Outdoor air temp. sensor
Th
6
Discharge pipe sensor
Symbol Parts name
ZNR Varistor
20S 4 way valve (coil) 52C Magnetic contactor
DS Diode stack 52X
1-3
Auxiliary relay
EEV Electronic expansion valve
51C Motor Protector for CM TB Terminal block

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184
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LO
MED
HI
AUTO
HI POWER ECONO
ON OFF
AM PM
FAN SPEED button
Each time the button is pushed, the indi-
cator is switched over in turn.
•The above illustration shows all controls, but in practice
only the relevant parts are shown.
OPERATION MODE select button
Each time the button is pushed, the indi-
cator is switched over in turn.
AIR FLOW button
This button changes the flap mode. When
pressed, this button changes the mode in the
following order:
ON/OFF button
Press for starting operation, press again for
stopping.
HI POWER button
This button changes the HIGH POWER
mode.
ECONO button
This button changes the ECONOMY mode.
RESET switch
Switch for resetting microcomputer.
ON TIMER button
This button selects ON TIMER operation.
Time switch
This switch for setting the time.
OFF TIMER button
This button selects OFF TIMER operation.
TEMPERATURE button
This button sets the room temperature.
(This button changes the present time and
TIMER time.)
CANCEL button
This button cancels the ON timer and OFF
timer.
RESERVE button
This button sets the present time and
TIMER time.
SIndication section
OPERATION MODE indicator
Indicates selected operation with lamp.
Heat pump type:
[ (Auto) • (Cool) • (Heat) • (Dry)]
Cooling only type:
[ (Auto) • (Cool) • (Fan) • (Dry)]
TEMPERATURE indicator
Indicates set temperature.
(Does not indicate temperature when operation
mode is on AUTO)
FAN SPEED indicator
Indicates set air flow rate with lamp.
AIR FLOW indicator
Shows selected flap mode.
HIGH POWER MODE indicator
Indicates during high power mode operation.
ECONOMY MODE indicator
Indicates during economy mode operation.
ON TIMER indicator
Indicates during ON TIMER operation.
TIME indicator
Indicates present time or timer setting time.
OFF TIMER indicator
Indicates OFF TIMER operation.
Models All models
Remote controller
SOperation section
(Air scroll) (Swing)
2.2.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
(1) Operation control function by remote control switch
(Flap stopped)

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185
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Unit indication section
Models All models
(2) Unit ON/OFF button
When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this button may be used to turn
the unit on and off.
(a) Operation
Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.
(b) Details of operation
The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor),
whether to go into the cooling, thermal dry or heating modes.
Function Room temperature
Operation mode
setting Fan speed Flap Timer switch
Cooling About 25ºC
Thermal dry About 25ºC Auto Auto Continuous
Heating About 26ºC
(3) Power blackout auto restart function
(a) Power blackout auto restart function is a function that records the operational status of the air-conditioner immediately prior to it
being switched off by a power cut, and then automatically resumes operations at that point after the power has been restored.
(b) The following settings will be cancelled:
(i) Timer settings
(ii) High-power operations
Notes (1) The power blackout auto restart function is set at on when the air-conditioner is shipped from the factory.
Consult with your dealer if this function needs to be switched off.
(2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the timer.
(3)
If the jumper wire (J7) “REMOTE/AUTORESTART” is cut, auto restart is disabled. (See the diagram at right)
Unit ON/OFF button
ECONOMY light (orange)
Illuminates during ECONOMY operation.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
RUN (HOT KEEP) light (green)
•Illuminates during operation.
•Brinks at air flow stop due to the ‘HOT KEEP’.
Jumper wire (J7)

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186
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(5) Flap control
Control the flap by AIRFLOW button on the wireless remote controller.
(a) Air scroll
The flap will be automatically set to the angle of air flow best to operation.
(i) Starting time of operation
(ii) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(b) Memory flap
While the flap is operating if the AIRFLOW button is pushed once, it stops swinging at an angle.
As this angle is memorized in the microcomputer, the flap will be automatically set to the angle when next operation is started.
¡Recommendable stopping angle of the flap
(c) Swing flap
Flap moves in upward and downward directions continuously.
sDuring cooling andt
dry operation
Thick line : Rapid movement
Thin line : Slow movement
Stops for approximately
5 seconds in the
horizontal position.
sDuring heating t
operation
Stops for approximately
5 seconds in this
position. Thick line : Rapid movement
Thin line : Slow movement
Horizontal
blowing
COOL•DRY
Slant forward
blowing
HEAT
(4) Custom cord switching procedure
If two wireless remote controllers are installed in one room, in order to prevent wrong operation due
to mixed signals, please modify the printed circuit board in the indoor unit’s control box and the
remote controller using the following procedure. Be sure to modify both boards. If only one board is
modified, receiving (and operation) cannot be done.
(a) Modifying the indoor unit’s printed circuit board
Take out the printed circuit board from the control box and cut off jumper wire (J6) using wire cutters.
After cutting of the jumper wire, take measures to prevent contact with the other the lead wires, etc.
(b) Modifying the wireless remote controller
(i) Remove the battery.
(ii) Cut the jumper wire shown in the figure at right.
Jumper wire (J6)
Cut

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187
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=
=
=
=
(6) Comfortable timer setting
If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation
is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the
relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.
(Max. 60 minutes)
Operation mode Operation start time correction value (Min.)
3 < Room temp. – Setting temp. 1 < Room temp. – Setting temp. <3 Room temp. – Setting temp. <1
At cooling +5 No change –5
3 < Setting temp. – Room temp. 2 < Setting temp. – Room temp. <3 Setting temp. – Room temp. <2
At heating +5 No change –5
Notes (1) At 5 minutes before the timer ON time, operation starts regardless of the temperature of the room temperature sensor (Th1).
(2) This function does not actuate when the operation select switch is set at the dehumidifying as well as the dehumidifying in the auto mode.
However, the operation of item (1) above is performed during the dehumidifying in the auto mode.
(3) During the comfortable timer operation, both the run light and timer light illuminate and the timer light goes off after expiration of the timer, ON setting time.
(Example) Heating
Setting temperature
Room temperature
(7) Outline of heating operation (Heat pump type only)
(a) Operation of major functional components
(b) Fan speed switching
(i) Auto fan control
The indoor fan is automatically controlled in accordance with the difference between the room temperature (detected by the
room temperature sensor) and the thermostat setting as shown below.
Indoor fan motor
Flaps
Display
52C
Outdoor fan motor
ON
ON or OFF
Lights up
ON
OFF
ON
ON or OFF
Lights up
ON
ON
ON
OFF
Stop position control
Lights up or flashes
OFF after stop mode
OFF
4-way valve
Electric expansion valve Depending on the stop mode
Depending on the EEV control
Depending on the stop mode
When the compressor
command is OFF
When the compressor
command is ON
When the compressor goes
OFF due to an anomalous stop.
Functional
components
Item
Air scroll
Swing flap
Swing stop
Auto fan control
Speed 8
Speed 8
Speed 8
Speed 6
Speed 6
Speed 6
AUTO HIGH MED
Speed 4
Speed 4
Speed 4
LOW
Flow control
Fan speed switching
Speed 8
Speed 6
Speed 4
Thermostat setting point
-5 -4 -3 -2 -1 0
Corrects the starting time of next operation by
calculating the temperature difference.
Operation starting time
Time Setting time 15 min. 10 min. 5 min.
earlier earlier earlier
¡If the difference (= Setting temperature – Room tempera-
ture) is 4ºC, the correction value is found to be +5 min-
utes from the table shown above so that the starting time
of next operation is determined as follows:
15 min. earlier + 5 min. = 20 min. earlier
↑↑
Current operation Correction value
start time

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188
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(ii) To accomplish rapid recovery from the thermostat off state, after the compressor and outdoor unit’s fan go OFF, the set
temperature is raised by 1ºC until 1 minute passes after the hot keep end temperature has been reached following restarting.
(e) Hot spurt
(i) For 40 minutes after a heating operation begins, the system runs with set temperature raised by 2ºC.
(ii) In the following cases, this function is canceled and does not activate afterwards.
1) When the compressor and outdoor unit fan have been turned OFF by the thermostat going off.
2) During high pressure control operation.
(f) HIGH POWER operation (“HI POWER” button on the remote controller : ON)
The system runs under the following conditions for 15 minutes without relation to the set temperature or the fan speed setting.
(g) Defrost operation
(i) Starting conditions (Defrost operation begins when all the following conditions are satisfied.)
135 minutes have passed since the heating operation began. (Accumulated operation time)
235 minutes have passed since the previous defrosting operation ended. (Accumulated operation time)
3The outdoor unit heat exchanger temperature sensor is –5ºC or lower continuously for 3 minutes.
4¡The outdoor temperature =
>-15°C
The difference between the outdoor temperature sensor temperature and the outdoor heat exchanger temperature
sensor temperature is =
>6.0ºC.
¡The outdoor temperature < -15°C
The difference between the outdoor temperature sensor temperature and the outdoor heat exchanger temperature
sensor temperature is =
>-5ºC.
5The compressor is running.
Also, the number of times the compressor goes OFF is counted, and when it reaches 10 or more times, if the conditions
in 1, 2and 3above (except that the outdoor heat exchanger temperature sensor is –1ºC), the defroster operation starts.
(ii) End conditions (when either of the following conditions is satisfied)
1Outdoor heat exchanger temperature sensor: 15ºC or higher
2Defrosting operation has continued for 10 minutes.
Notes (1) Room temperature is not adjusted during the HIGH POWER operation.
(2) Protective function will actuate with priority even during the HIGH POWER
operation.
Indoor unit fan
Outdoor unit fan
Compressor
Speed 9 fixed
ON
ON
Note (1) Refer to the table shown above right for the values A and B.
Indoor heat exchanger temp. (˚C)
¡Values of A, B
AB
When the compressor
command is OFF 22 25
When the compressor 17 19
command is ON
AB27.5 28 29.5 31.5 34 36 37.5 39 40
1st speed
2nd speed
3rd speed
4th speed
6th speed
7th speed
OFF
8th speed
9th speed
(c) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(d) Hot keep
This function controls the indoor unit fan speed as shown below in accordance with the temperature sensed by the indoor heat
exchanger sensor.
(i) Indoor unit fan control
OFF
ON
Set temp.
Compressor
Outdoor fan
+1
Room temp.

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189
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(iii) Operation of functional components during defrosting operation
(h) Forced Defrost
(i) Forced defrost operation can be performed only once time within 20 second, after the power source is turned on, in accor-
dance with the following operation.
1) Remote control operation
(ii) If remote control operation is performed, for 1 minute after 3-minute timer operation, the operation is canceled if one of the
following conditions is satisfied.
1Outdoor heat exchanger temperature sensor: 14ºC or higher
210 minutes has passed (including the 1 minute of forced operation).
(i) ECONOMY operation ( “ECONO” button on the remote controller : ON)
The set temperature changes as shown at right and the
indoor unit fan runs at speed 4.
OFF
Compressor command
Indoor unit fan
Run light
Flashes
Outdoor unit fan
4-way valve
Defrost start operation
Hot keep
Defrost operation Operation after defrost is ended.
Normal heating operation
(defrost recovery)
Controlled by the indoor heat
exchanger temperature
The chart at left is for reference.
Hot keep control governs operation
during heating.
Hot keep
Recovery
temperature
(15˚C)
OFF
OFF
OFF
ON
ON
Lit
ON
ON
120 sec. 120 sec.
Operation
Operation mode
Set temperature
Fan speed select
Air flow setting
On timer
Current time
On timer time
Run
Heating
19˚C
Low
Swing
ON
On after 180 min.condition
Compressor
4-way valve
Indoor unit fan
Flap
Outdoor unit fan
Display
ON
OFF
OFF
Fully closed
OFF
Same as defrost
2) Functional components operation
Running time
Running start ~ 1 hour
1~2 hours
2 hours ~
Set temperature compensation
Set temperature -1.0
Set temperature -2.0
Set temperature -2.5

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190
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(8) Outline of cooling operation
(a) Operation of major functional components
(b) Fan speed switching
(i) Auto fan control
The indoor fan is automatically controlled in accordance with the difference between the room temperature (detected by the
room temperature sensor) and the termostat setting as shown below.
(c) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(d) HIGH POWER operation ( “HI POWER” button on the remote controller : ON)
The following operation is performed for 15 minutes without relation to the set temperature or fan speed setting.
(e) ECONOMY operation ( “ECONO” button on the remote controller : ON)
The set temperature changes as shown at right, and the
indoor unit fan speed is set on speed 3.
Notes (1) Room temperature is not adjusted during the HIGH POWER operation.
(2) Protective functions will actuate with priority even during the HIGH POWER
operation.
Indoor fan motor
Flaps
Display
52C
Outdoor fan motor
ON
ON or OFF
Lights up
ON
OFF
ON
ON or OFF
Lights up
ON
ON
OFF
OFF
Stop position control
Lights up or flashes
OFF after stop mode
OFF
Depending on the stop mode Depending on the stop mode
When the compressor
command is OFF
When the compressor
command is ON
When the compressor goes
OFF due to an anomalous stop.
Functional
components
Item
4-way valve
Electric expansion valve
Depending on the EEV control
Air scroll
Swing flap
Swing stop
Auto fan control
Speed 7
Speed 7
Speed 7
Speed 5
Speed 5
Speed 5
AUTO HIGH MED
Speed 3
Speed 3
Speed 3
LOW
Flow control
Fan speed switching
Speed 5
Speed 4
Speed 3
Thermostat setting point
Speed 7
+1 +2 +3 +4
OFF
ON
Set temp.
-1
Room temp.
Compressor
Outdoor fan
Indoor unit fan
Outdoor unit fan
Compressor
Speed 8 fixed
ON
ON
Running time
Running start ~ 1 hour
1~2 hours
2 hours ~
Set temperature compensation
Set temperature +0.5
Set temperature +1.0
Set temperature +1.5

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Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 3
369120
Speed 1
20
seconds
minutes
C.D Block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Set fan speed
120 minutes
A.B Block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 3
480
Speed 1
20
seconds
minutes
B Block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 3
80 minutes
A Block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
480
Speed 1
20
seconds
minutes
20
seconds
D Block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 3
Speed 1
830 minutes
C Block
Operation block decision
Operation block decision
Operation block decision
Note (1) Thermostat operation is performed in A, B Block. When compressor and indoor fan stop by thermostat operation within 12 minutes from start, temperature
check is performed by operating indoor fan at speed 1 for 20 seconds before finishing 12 minutes and allowing decision of next operation block.
(c) DRY operation
After finishing start up operation described in (b) above, thermal dry operation is performed at 8 minutes intervals, according to
the difference between room temperature and thermostat setting temperature as shown below.
Beside, 1 cycle of this operating time consists of 8 minutes, 7 cycle operation is performed then.
D Block C Block B Block A Block
(9) Outline of dehumidifying operation
(a) Choose the appropriate operation block area by the difference between room temperature and thermostat
setting temperature as shown below.
¡Operation block area
–2 0 +3
Room temp. – Setting temp.(deg)
(b) Start up operation
Running time
Running start ~ 1 hour
1~2 hours
2 hours ~
Set temperature compensation
Set temperature +0.5
Set temperature +1.0
Set temperature +1.5
(d) ECONOMY operation ( “ECONO” button on the remote controller : ON)
The set temperature changes as shown at right, and the
indoor unit fan speed is set on speed 3 .

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27.5
25.5
19.5
18 30
27.5
25.5
19.5
18 30
(10) Outline of automatic operation
(a) Determination of operation mode
The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20
seconds, determines the operation mode and the room temperature setting correction value, and then begins in the automatic
operation.
¡Heat pump type
(b) Within 30 minutes after either auto or manual operation stops, if auto operation is started, or if you switch to auto operation during
manual operation, the system runs in the previous operation mode.
(c) The temperature is checked 1 time in 30 minutes after the start of operation, and if the judgment differs from the previous operation
mode, the operation mode changes.
(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals of
the wireless remote controller and the setting temperature.
Signals of wireless remote controller (Display)
–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6
Setting Cooling 19 20 21 22 23 24 25 26 27 28 29 30 31
temperature Dehumidifying 19 20 21 22 23 24 25 26 27 28 29 30 31
Heating 20 21 22 23 24 25 26 27 28 29 30 31 32
(11) Outline of fan operation (Cooling only type only)
(a) Operation of major functional components
(b) HIGH POWER operation (“HI POWER” button on the remote controller : ON)
The following operation is performed for 15 minutes without relation to the set temperature or fan speed setting.
52C
Indoor fan motor
Outdoor fan motor
Flaps
Speed 8 Speed 7 Speed 6
OFF
OFF
Depend on the flap control
Speed 5 Speed 4 Speed 3
High power AUTO HIGH MED LOW ECONO
Functional
components
Fan speed switching
Indoor unit fan
Outdoor unit fan
Compressor
Speed 8 fixed
OFF
OFF
Note (1) Protective functions will actuate with priority even during the HIGH POWER operation.
Heating
Dehumidifying
Cooling
Room temperature (˚C)
Outdoor temperature (˚C)
Room temperature (˚C)
¡Cooling only type
Cooling
Dehumidifying
Outdoor temperature (˚C)

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¡When the indoor heat exchanger
temperature is =
>58˚C
Indoor heat exchanger temp. (˚C)
Compressor
Indoor heat exchanger temp. (˚C)
¡When the indoor heat exchanger
temperature is =
>62˚C
48 62
ON
OFF
(e) Heating overload protective control
(i) Operating conditions: when the unit is heating with the compressor is on, and the outdoor air temperature rose beyond 17°C
for 30 seconds continuously.
(ii) Detail of operation: indoor fan speed is raised forcibly by 1 step.
(iii) Reset conditions: when the outdoor air temperature drops below 16°C.
(f) Abnormality of outdoor unit
(i) Cooling operation
When the indoor heat exchanger temperature does not fall to 25°C or below for 40 minutes after 5 minutes have elapsed since
the compressor operation start, the abnormality stop occurs. (The timer light flashes 2 times.)
(ii) Heating operation
1The indoor heat exchanger temperature < 5°C for 5 minutes and more
The unit is stopped due to the outdoor unit abnormality excepting the defrost operation time. (The timer light flashes 2
times.)
25°C <
=the indoor heat exchanger temperature < 30°C for 40 minutes and more
When the indoor heat exchanger temperature does not rise to 30°C or over for more than 40 minutes after 5 minutes have
elapsed since the compressor operation start, the abnormality stop occurs. However, when the indoor fan began operation
once, this function is not activated until the unit is stopped or the mode is changed. (The timer light flashes 2 times when
20 minutes have elapsed.)
Outdoor fan
48 58
OFF
ON
(12) Protective control function
(a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying)
(i) Operating conditions
(i) Indoor heat exchanger temperature sensor (detected with Th2) is lower than 2.5ºC.
(ii) 10 minutes elapsed after the start of operation.
(ii) Detail of frost prevention operation
Compressor OFF
Indoor fan Protects the fan tap just before frost prevention control.
Outdoor fan OFF
4-way valve Stop mode
(iii) Reset conditions: Indoor heat exchanger temperature sensor (Th2) is higher than 8ºC.
(b) Indoor fan motor protection
When the air-conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 rpm or
under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
Timer light illuminates simultaneously and the run light flashing 6 times at each 8-second.
(c) Three-minute forced operation
When the compressor begins operating the thermal operation is not effective for 3 minutes, so operation continues as is in the
operation mode. (After 3 minutes has passed the thermal operation is effective.)
However, stopping the compressor via a stop signal or protection control has priority.
(d) High-pressure control
The indoor heat exchanger temperature sensor detection temperature controls the outdoor fan and compressor.