Mitsubishi Heavy Industries SRK20HD User manual

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3
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WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
Collection data
Manual No. ’05
.
SRK-T
.
045
(Split system, air to air heat pump type)
SRK20HD
   
http://splitoff.ru/tehn-doc.html
, ,  , .

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CONTENTS
1. GENERAL INFORMATION .............................................................................. 1
1.1 Specific features ....................................................................................... 1
1.2 How to read the model name ................................................................... 1
2. SELECTION DATA........................................................................................... 2
2.1 Specifications ........................................................................................... 2
2.2 Range of usage & limitations .................................................................. 3
2.3 Exterior dimensions ................................................................................. 3
2.4 Piping system ........................................................................................... 4
2.5 Selection chart .......................................................................................... 5
3. ELECTRICAL DATA ........................................................................................ 6
3.1 Electrical wiring ........................................................................................ 6
4. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ................... 7
4.1 Operation control function by remote control switch ........................... 7
4.2 Unit ON/OFF button .................................................................................. 8
4.3 Power blackout auto restart function ..................................................... 8
4.4 Flap control ............................................................................................... 9
4.5 Comfortable timer setting ........................................................................ 9
4.6 Outline of heating operation .................................................................... 10
4.7 Outline of cooling operation .................................................................... 13
4.8 Outline of dehumidifying operation ........................................................ 14
4.9 Automatic operation ................................................................................. 15
4.10 Protective control function ...................................................................... 15
5. APPLICATION DATA ....................................................................................... 17
5.1 Selection of location for installation ....................................................... 18
5.2 Installation of indoor unit......................................................................... 19
5.3 Installation of outdoor unit ...................................................................... 21
5.4 Refrigerant piping ..................................................................................... 21
5.5 Test run ...................................................................................................... 23
5.6 Precautions for wireless remote controller installation and
operation ................................................................................................... 23
6. MAINTENANCE DATA .................................................................................... 24
6.1 Trouble shooting....................................................................................... 24
6.2 Servicing.................................................................................................... 29
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Serial signal transmission error
1 GENERAL INFORMATION
1.1 Specific features
The “Mitsubishi Daiya” 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 opera-
tion control switch and the outdoor unit is composed of condensing unit with compressor.
(1) 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.
(2) 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.
(3) 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.
Series No.
Heat pump type
Product capacity
Wall mounted type
Split type room air-conditioner
1.2 How to read the model name
Example : SR K 20 H D
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
Outdoor unit error
Compressor overheat
Current cut
2 time flash
5 time flash
RUN light
ON
1 time flash
2 time flash
5 time flash
1 time flash
6 time flash 6 time flash
RUN light TIMER light Outdoor (LED)
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Item
Model SRK20HD SRC20HD
Cooling capacity(1) W 2000
Heating capacity(1) W 2200
Power source 1 Phase, 220-240V, 50Hz
Cooling input kW 0.635
Running current (Cooling) A 3.1/3.0/2.9
Heating input kW 0.605
Running current (Heating) A 3.0/2.9/2.8
Inrush current A 18
COP Cooling: 3.15 Heating: 3.64
Cooling sound level Hi: 35 , Me: 28 , Lo: 26 45
Noise level Power level dB 53 59
Heating sound level Hi: 35 , Me: 31 , Lo: 27 45
Power level 53 59
Exterior dimensions
Height ×Width ×Depth mm 250 ×815 ×249 540 ×720 ×290
Color Cool white Stucco white
Net weight kg 9.0 32
Refrigerant equipment
Compressor type & Q’ty –RM5485GNE95 (Rotary type) ×1
Motor kW –0.75
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 0.77 (Pre-Charged up to the piping length of 7.5m)
Refrigerant oil R0.35 (BARREL FREEZE 32SAM)
Deice control MC control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 14 12
(Cooling) 7.5 26
Air flow (at High) (Heating) CMM 7.5 26
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 MC. 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: φ9.52 (3/8″)
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4 m
Gas line : 0.33 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2.5 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
Optional parts –
Notes (1) The data are measured at the following conditions.
2 SELECTION DATA
2.1 Specifications
Model SRK20HD (Indoor unit)
SRC20HD (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 7.5 m connecting piping.
If the piping length is longer, when it is less than 10 m, add 20 g refrigerant per meter and when it is 10 to 15 m, add 30 g refrigerant per meter.
Operation data
(1)
Refrigerant piping
Frost protection, Serial signal error protection
Fan motor error protection
The piping length is 7.5m.
Compressor overheat protection, Overcurrent pro-
tection, Serial signal error protection
(220/230/240V)
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2.2 Range of usage & limitations
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length Max. 15m
SRK20HD
Refer to the selection chart
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. 5m (Outdoor unit is higher)
Max. 5m (Outdoor unit is lower)
Item
Model
2.3 Exterior dimensions
(1) Indoor unit
Model SRK20HD
VIEW A
117.5 580 117.5
148.5
216.5
216.5
216.5
8.2
44.5
236.1
5.7
450
450
67.5
42.7 47.2
175
44.5
216.5
216.5
216.5
148.5
53.5
Piping for Gas 397.1 (ø9.52)
Drain hose 540 (ø16)
Piping for Liquid 465.1 (ø6.35)
Piping hole (ø65) Piping hole (ø65)
45
14.5
60
788
560
45
815
A
250
Unit: mm
Piping hole right(left)
Terminal block
960
45
3
249
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(2) Outdoor unit
Model SRC20HD Unit: mm
290540
14.4 47.4 42.6
264.5
71
404.5
510
720
17.8
Drain holes
50
12
39.799.9
340
312.5 13.5
14
139 2-16 x12
61.9
139.3 33.3
Flare connecting ø6.35 (1/4")
Service valve (Liquid)
40˚
40˚
Flare connecting ø9.52 (3/8")
Service valve (Gas)
Terminal block
2.4 Piping system
Outdoor unitIndoor unit
Flare connecting
Room temp.
sensor
Heat
exchanger
Flare connecting
Piping
(Liquid)
ø6.35
Heat
exchanger
sensor
Piping
(Gas)
ø9.52
Service valve
(Gas)
Check joint
4 way valve
Service valve (Liquid)
Strainer
Capillary tube Capillary tubeCapillary tube
Compressor
Accumulator
Discharge temp.
sensor
Heat exchanger
sensor
Heat
exchanger
Outdoor air
temp. sensor
Cooling cycle
Heating cycle
Model SRK20HD
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2.5 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.
(1) Coefficient of cooling and heating capacity in relation to temperatures
(2) 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.
(3) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (1), (2) 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 SRK20HD 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 = 2000 ✕0.975 ✕1.0 =1950 w
SRK20HD Length 15m Factor by air
temperatures
15
ISO-T1 Standard ConditionOutdoor air W.B. temperature °C W.B.
0 10-10 -5 5
14 16 18 20 22
15
10
27
25
20
15
20
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
24
20
ISO-T1 Standard ConditionIndoor air W.B. temperature °C W.B.
Heating
Cooling
Applicable range
Coefficient of cooling & Heating capacity in relation to temperature
Cooling operation
Outdoor air D.B.
temperature
°C D.B.
Heating operation
Indoor air D.B.
temperature
°C D.B.
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
Air inlet temperature of
outdoor unit in ˚CWB
Adjustment coefficient
-10
0.95
-9
0.94
-7
0.93
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00
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3 ELECTRICAL DATA
3.1 Electrical wiring
Model SRK20HD
Power source
1 Phase 220/230/240V 50Hz Outdoor unit
Indoor unit
LB
CNW
CF
I
WH
HEAT EXCHANGER
CNM
CNU
CNC
Tr
F
(250V 3.15A)
52C-3
52C
52C
Printed circuit
board
Printed circuit
board
1
1 1 5 3
3
52X1
CFO
52X2
52X3
52X3 52X2
52X1
52C-4
N
ZNR
IC8
3 5
1
WH
2/N
3
Y/GN
SM
FM
I
FMo
CM
20S
LB
BR
BK
RD
Y/GN
RD
WH
BR
TB TB
RD
J
Y/GN
G
LN J
F
(250V 3.15A)
ZNR
BK
BK
2 51C
3
1
CM1
CM2
WH
WH
WH
CC
RD
RD
Y/GN
G1
D.S
BR
BK
CNB
CNE CNG
Th1 Th2
CNG
Th4
Th5
Th6
CNB
CNU
Display
Wireless R-Amp
1
2
3
Black Brown Red Light blue White
Yellow/Green
BK BR RD LB
WH Y/GN
Color symbol
Meaning of marks Symbol Parts name
I
Symbol Parts name Symbol Parts name
CFI CM F FMI FMo SM
Th1 Th2 Th4 Th5 Th6 Tr
Capacitor for FMI Compressor motor Fuse Fan motor (Indoor) Fan motor (Outdoor) Flap motor
Room temp. sensor Heat exchanger sensor (Indoor unit) Heat exchanger sensor (Outdoor unit) Outdoor air temp. sensor Discharge temp. sensor Transformer
ZNR 20S 52C DS 52X1-3 51C
Varistor 4 way valve (coil) Magnetic contactor Diode stack Auxiliary relay Motor Protector for CM
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LO
MED
HI
AUTO
HI POWER ECONO
ON OFF
AM PM
HI POWER TEMP ECONO
AIR FLOW
CANCEL
ON OFF RESERVE
TIMER
TIME ACL
FAN SPEED
ON
MODE
LO
MED
HI
AUTO
TIME
OFF
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 HI POWER mode.
ECONOMY button
This button changes the ECONOMY mode.
RESET switch
Switch for resetting microcomputer.
ON TIMER button
This button selects ON TIMER operation.
Clock switch
This switch for setting the clock.
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.
[ (Auto) • (Cool) • (Heat) • (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.
HI POWER MODE indicator
Indicates during Hi power mode operation.
ECONOMY MODE indicator
Indicates during economy mode operation.
ON TIMER indicator
Indicates during ON TIMER operation.
Clock indicator
Indicates present time or timer setting time.
OFF TIMER indicator
Indicates during OFF TIMER operation.
Model SRK20HD
Remote controller
SOperation section
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
4.1 Operation control function by remote control switch
(Air scroll) (Swing)
(Flap stopped)
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Unit indication section
Model SRK20HD
4.2 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
4.3 Power blackout auto restart function
(1) 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.
(2) The following settings will be cancelled:
(a) Timer settings
(b) 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 HI POWER operation.
RUN (HOT KEEP) light (green)
•Illuminates during operation.
•Flashes at air flow stop due to the ‘HOT KEEP’.
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4.4 Flap control
Control the flap by AIRFLOW button on the wireless remote controller.
(1) Air scroll
The flap will be automatically set to the angle of air flow best to operation.
(a) Starting time of operation
(b) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(2) 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
(3) 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
Corrects the starting time of next operation by
calculating the temperature difference.
(Example) Heating
Setting temperature
Room temperature
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
4.5 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.
=
=
=
=
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4.6 Outline of heating operation
(1) Operation of major functional components
(2) Fan speed switching
(a) 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.
(3) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(4) 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.
(a) When the compressor and outdoor unit fan are operating
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
Stop position control
Lights up or flashes
OFF after stop mode
OFF
4-way valve Depending on the stop mode ON 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 abnormal stop.
Functional
components
Item
Air scroll
Swing flap
Swing stop
Auto fan control
Speed 6
Speed 6
Speed 6
Speed 4
Speed 4
Speed 4
AUTO HIGH MED
Speed 2
Speed 2
Speed 2
LOW
Flow control
Fan speed switching
Speed 6
Speed 4
Speed 2
Thermostat setting point
-5 -4 -3 -2 -1 0
OFF
ON
Set temp.
Compressor
outdoor fan
+1
Room temp.
Speed 6
Speed 4
Speed 2
Speed 1
OFF
4034302515
Auto fan control,
or the set fan speed
Indoor heat exchanger temp. (˚C)
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(c) 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.
(5) Hot spurt
(a) For 40 minutes after a heating operation begins, the system runs with set temperature raised by 2ºC.
(b) 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.
(6) 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.
(7) Defrost operation
(a) Starting conditions (Defrost operation begins when all the following conditions are satisfied.)
140 minutes have passed since the heating operation began. (Accumulated operation time)
240 minutes have passed since the previous defrosting operation ended. (Accumulated operation time)
3The outdoor unit heat exchanger sensor temperature is –5ºC or lower continuously for 3 minutes.
4The difference between the outdoor air temperature sensor temperature and the outdoor heat exchange sensor tempera-
ture is =
>4.5ºC.
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 sensor temperature is –1ºC), the defroster operation starts.
(b) End conditions (when either of the following conditions is satisfied)
1Outdoor heat exchanger sensor temperature: 9ºC or higher
2Defrosting operation has continued for 10 minutes.
Speed 6
Speed 4
Speed 2Speed 2
OFF
403430
Auto fan control,
or the set fan speed
Indoor unit fan
Outdoor unit fan
Compressor
Speed 6 fixed
ON
ON
(b) When the compressor and outdoor fan are stopped
1) While the compressor operation is delayed.
2) Up until 5 minutes have passed
since the end of a compressor
start delay operation, when 52C
goes OFF, the indoor unit’s fan
speed changes forcibly from
OFF to speed 1.
Indoor heat exchanger temp. (˚C)
Notes (1) Room temperature is not adjusted during the HI POWER operation.
(2) Protective function will actuate with prioriy even during the HI POWER operation.
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(c) Operation of functinal components during defrosting operation
(8) Forced defrost
(a) During trial operation, if defrost operation is performed, defrost operation can be performed only once time, in accordance
with the following operation.
1) Remote control operation
(b) 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 sensor temperature: 14ºC or higher
210 minutes has passed (including the 1 minute of forced operation).
(9) ECONO operation ( “ECONO” button on the remote controller : ON)
The set temperature changes as shown at right and the
indoor unit fan runs at speed 3.
OFF
Compressor command
Indoor unit fan
Operating lamp
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
(9ºC)
OFF
OFF
OFF
ON
ON
Lit
ON
ON
120 sec. 120 sec.
110 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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4.7 Outline of cooling operation
(1) Operation of major functional components
(2) Fan speed switching
(a) 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.
(3) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(4) 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.
(5) ECONO 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 2.
Notes (1) Room temperature is not adjusted during the HI POWER operation.
(2) Protective functions will actuate with priority even during the HI 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
Stop position control
Lights up or flashes
OFF after stop mode
OFF
4-way valve Depending on the stop mode OFF 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 abnormal stop.
Functional
components
Item
Air scroll
Swing flap
Swing stop
Auto fan control
Speed 5
Speed 5
Speed 5
Speed 3
Speed 3
Speed 3
AUTO HIGH MED
Speed 2
Speed 2
Speed 2
LOW
Flow control
Fan speed switching
Speed 4
Speed 3
Speed 2
Thermostat setting point
Speed 5
+1 +2 +3 +4
OFF
ON
Set temp.
-1
Room temp.
Compressor
outdoor fan
Indoor unit fan
Outdoor unit fan
Compressor
Speed 6 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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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.
(3) DRY operation
After finishing start up operation described in (2) 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
4.8 Outline of dehumidifying operation
(1) 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)
(2) Start up operation
ON
OFF
OFF
0 3 6 9 12
ON
OFF
OFF
0 12
Compressor
and
outdoor fan
Set fan speed
Indoor fan
Start Temperature check Start Temperature check
Compressor
and
outdoor fan
Set fan speed
Indoor fan
Operation block decision
C.D Block A.B Block
minutes
minutes
Speed 1Speed 1
20
seconds
ON
OFF
OFF
0 4 8
ON
OFF
OFF
0 8
Compressor
and
outdoor fan
Indoor fan
D Block
Compressor
and
outdoor fan
Indoor fan
C Block
Compressor
and
outdoor fan
Indoor fan
B Block
Compressor
and
outdoor fan
Indoor fan
A Block
20 seconds 20 seconds
minutes
minutes
Start Temperature check Start Temperature check
Operation block decision
20 seconds
minutes
minutes
Start Temperature check Temperature check
Operation block decision
Start
Speed 1
Speed 1
OFF
OFF
08
ON
OFF
OFF
0 3 8
Speed 1
Speed 1
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
(4) ECONO 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 2 .
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4.9 Automatic operation
(1) Determination of operation mode
The blow operation of the indoor fan is carried out at the 1st speed for 20 seconds and the room temperature is checked to
determine the operation mode automatically. (When the unit is operated by the turn-on timer, the blow operation is not carried out.)
Room temperature
Operation mode
Room temp.<21˚C 21˚C Room temp.<26˚C
<
=
26˚C Room temp.
Heating Dry Cooling
<
=
(2) 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.
(3) 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.
(4) 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
4.10 Protective control function
(1) Frost prevention for indoor heat exchanger (During cooling or dehumidifying)
(a) Operating conditions
(i) Indoor heat exchanger temperature (detected with Th2) is lower than 2.5ºC.
(ii) 3 minutes elapsed after the start of operation.
(b) Detail of anti-frost operation
Compressor OFF
Indoor fan 1st speed
Outdoor fan OFF
4-way valve Stop mode
(c) Reset condition: Indoor heat exchanger temperature (Th2) is higher than 8ºC.
(2) 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 operation lamp flashing 6 times at each 8-second.
(3) Dew condensation prevention control for cooling operation
This prevents dew condensation, in the indoor unit, from occurring.
(a) Operating condition: when compressor is kept ON for 30 min. after the unit starts operation.
(b) Operation content: forces the indoor fan to change from Speed 1 to Speed 2.
(c) Resetting condition: When compressor is off, or when dew condensation prevention control has been operating continu-
ously for 30 minutes.
(4) 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.
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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
(5) High-pressure control
The indoor heat exchanger sensor detection temperature controls the outdoor fan and compressor.
48 62
ON
OFF
(6) Current Cut
If current that is higher than the set current flows for 0.5 second continuously, the current to the compressor is cut off. After a 3-
minute delay, if the current is 1.5 ~ 2 A or less, the compressor restarts, but if the overcurrent is detected 5 times within 60 minutes
after it is detected the first time, it results in an abnormal stop. Also, if the overcurrent continues for 60 minutes, it results in an
abnormal stop.
(7) Compressor overheat protection
If the discharge pipe temperature (sensed by Th6) exceeds the set temperature value, the compressor stops. If the temperature is 95ºC
or lower after a 3-minute delay, it starts again, but if this function is reactivated again within 60 minutes, it results in an abnormal stop.
(8) Serial signal transmission error protection
(a) Purpose: Prevents malfunction resulting from error on the indoor ↔outdoor signals.
(b) Detail of operation: When the indoor unit controller ↔outdoor unit controller signals cannot be received, the compressor
is stopped immediately. Simultaneously, the red LED on the printed circuit board of outdoor unit controller flashing 6 times
for 0.5 second at intervals of 8 seconds. Once the operation stops, it does not start any more.
(TIMER light on the indoor unit flashing at the same time.)
(9) Sensor disconnection (room temperature, indoor heat exchanger, outdoor heat exchanger, outdoor air tem-
perature, discharge pipe)
(a) Room temperature sensor
If the temperature detected by the room temperature sensor is –20ºC or lower continuously for 15 seconds or longer while
operation is stopped, an error indication is displayed.
(b) Indoor heat exchanger sensor
If the temperature detected by the indoor heat exchanger sensor is –20ºC or lower continuously for 15 seconds or longer
while operation is stopped, an error indication is displayed.
Also, if the temperature detected by the indoor heat exchanger sensor is –20ºC or lower continuously for 3 minutes after
heating operation has started, the indoor unit’s fan speed is forcibly raised to speed 5. After this, the air conditioner is stopped
if the detected temperature remains at –20ºC continuously for 40 minutes.
(c) Outdoor heat exchanger sensor
If the temperature detected by the outdoor heat exchanger sensor is –50ºC or lower continuously for 15 seconds or longer
while operation is stopped, an error indication is displayed.
Also, the air conditioner is stopped if the temperature detected by the outdoor heat exchanger sensor remains at –50ºC or
lower continuously for 40 minutes after heating operation has started.
(d) Outdoor air temperature sensor
If the temperature detected by the outdoor air temperature sensor is –40ºC or lower continuously for 15 seconds or longer
while operation is stopped, an error indication is displayed.
(e) Discharge pipe sensor
After the compressor has operated for 9 minutes continuously, if there is a disconnected signal for the discharge pipe sensor
detected temperature for 15 seconds (less than 7ºC), the compressor stops. After a 3-minute delay, it restarts, but if an
abnormality is detected 4 times continuously, the air conditioner is stopped fully and an error indication is displayed.
Discharge pipe temperature (˚C)
Outdoor fan
48 58
OFF
ON
Operation possible
Abnormal stop
12595
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5 APPLICATION DATA
SAFETY PRECAUTIONS
¡Please read these “Safety Precautions” first then accurately execute the installation work.
¡Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points
which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the
WARNING section. However, there is also a possibility of serious consequences in relationship to the points listed in the
CAUTION section as well. In either case, important safety related information is indicated, so by all means, properly observe all
that is mentioned.
¡After completing the installation, along with confirming that no abnormalities were seen from the operation tests, please explain
operating methods as well as maintenance methods to the user (customer) of this equipment, based on the owner’s manual.
Moreover, ask the customer to keep this sheet together with the owner’s manual.
WARNING
¡To disconnect the appliance from the mains supply this appliance must be connected to the mains by means of
a circuit breaker or a switch (use a recognized 16A) with a contact separation of at least 3mm.
¡The appliance shall be installed in accordance with national wiring regulations.
¡This system should be applied to places as households, residences and the like. Application to inferior environ-
ment such as engineering shop could cause equipment malfunction.
¡Please entrust installation to either the company which sold you the equipment or to a professional contractor.
Defects from improper installations can be the cause of water leakage, electric shocks and fires.
¡Execute the installation accurately, based on following the installation manual. Again, improper installations can
result in water leakage, electric shocks and fires.
¡For installation, confirm that the installation site can sufficiently support heavy weight. When strength is insuffi-
cient, injury can result from a falling of the unit.
¡For electrical work, please see that a licensed electrician executes the work while following the safety standards
related to electrical equipment, and local regulations as well as the installation instructions, and that only exclu-
sive use circuits are used.
Insufficient power source circuit capacity and defective installment execution can be the cause of electric shocks
and fires.
¡Accurately connect wiring using the proper cable, and insure that the external force of the cable is not conducted
to the terminal connection part, through properly securing it improper connection or securing can result in heat
generation or fire.
¡Take care that wiring does not rise upward ,and accurately install the lid/service panel.It’s improper installation
can also result heat generation or fire.
¡When setting up or moving the location of the air conditioner, do not mix air etc. or anything other than the
designated refrigerant (R22) within the refrigeration cycle.
Rupture and injury caused by abnormal high pressure can result from such mixing.
¡Always use accessory parts and authorized parts for installation construction. Using parts not authorized by this
company can result in water leakage, electric shock, fire and refrigerant leakage.
¡Ventilate the work area when refrigerant leaks during the operation.
Coming in contact with fire, refrigerant could generate toxic gas.
¡Confirm after the foundation construction work that refrigerant does not leak.
If coming in contact with fire of a fan heater, a stove or movable cooking stove, etc., refrigerant leaking in the
room could generate toxic gas.
CAUTION
¡Execute proper grounding. Do not connect the ground wire to a gas pipe, water pipe, lightning rod or a telephone
ground wire.
Improper placement of ground wires can result in electric shock.
¡The installation of an earth leakage breaker is necessary depending on the established location of the unit.
No installing an earth leakage breaker may result in electric shock.
¡Do not install the unit where there is a concern about leakage of combustible gas.
The rare even of leaked gas collecting around the unit could result in an outbreak of fire.
¡For the drain pipe, follow the installation manual to insure that it allows proper drainage and thermally insulate it
to prevent condensation. Inadequate plumbing can result in water leakage and water damage to interior items.
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5.1 Selection of location for installation
(1) Indoor unit
(a) Where there is no obstructions to the air flow and where the cooled
air can be evenly distributed.
(b) A solid place where the unit or the wall will not vibrate.
(c) A place where there will be enough space for servicing. (Where
space mentioned below can be secured)
(d) Where wiring and the piping work will be easy to conduct.
(e) The place where receiving part is not exposed to the direct rays of
the sun or the strong rays of the street lighting.
(2) Outdoor unit
(a) A place where good air circulation can be obtained and where rain, snow or sunshine will not directly strike the unit.
(b) A place where discharged hot air or unit’s operating sound will not be a nuisance to the neighborhood.
(c) A place where servicing space can be secured.
(d) A place where vibration will not be enlarged.
Model SRK20HD
Item
One way piping length (R)15 m
Outdoor
unit is lower 5 m
Outdoor unit
is higher 5 m
r
h
Left
side
Right
side
5 cm
10 cm
1.5 cm
6.5 cm
Air inlet
Air inlet
Air
Outlet
100
100600
No obstacles
(Service space
for electrical
parts)
Unit : mm Notes (1) Blowing out port and suction port on the back side of the unit can be
installed at a distance of 10cm from walls.
In case the barrier is 1.2m or above in height, or is overhead, the
sufficient space between the unit and wall shall be secured.
(2) When the unit is installed, the space of the following dimension and
above shall be secured.
(e) In heating operation, snow deposit on the heat-exchanger of outdoor unit must be
prevented for keeping the normal performance capacity.
(i) Snow-hood on outdoor unit as in drawing, will reduce the frequency of
defrost operation.
When installing the snow hood, take care so that the air outlet of the snow
hood will not face directly into the most windy direction.
(ii) Design the base higher than possible snow deposit.
(3) Limitations for one way piping length and vertical
height difference.
()
Vertical height
difference (h)
Snow hood
Height:
Must be over
the possible
snow deposit
height
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