TECHNICAL MANUAL
Collection data
WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
Manual No. ’07
.
SRK-T
.
068
(Split system, air to air heat pump type)
SRK20HG-S
SRK28HG-S
SRK40HG-S
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3
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 .................................................................. 5
2.3 Exterior dimensions ................................................................................. 5
2.4 Piping system ........................................................................................... 7
2.5 Selection chart .......................................................................................... 8
3. ELECTRICAL DATA ........................................................................................ 9
3.1 Electrical wiring ........................................................................................ 9
4. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ................... 10
4.1 Operation control function by remote control switch ........................... 10
4.2 Unit ON/OFF button .................................................................................. 11
4.3 Power blackout auto restart function ..................................................... 11
4.4 Custom cord switching procedure ......................................................... 12
4.5 Flap control ............................................................................................... 12
4.6 Timer operation ......................................................................................... 13
4.7 Outline of heating operation .................................................................... 14
4.8 Outline of cooling operation .................................................................... 17
4.9 Outline of dehumidifying operation ........................................................ 18
4.10 Outline of automatic operation................................................................ 19
4.11 Outline of clean operation ....................................................................... 19
4.12 Protective control function ...................................................................... 20
5. APPLICATION DATA ....................................................................................... 22
5.1 Selection of location for installation ....................................................... 23
5.2 Installation of indoor unit......................................................................... 24
5.3 Installation of outdoor unit ...................................................................... 27
5.4 Connection of refrigerant piping ............................................................. 27
5.5 Test run ...................................................................................................... 29
5.6 Precautions for wireless remote control installation and
operation ................................................................................................... 29
6. MAINTENANCE DATA .................................................................................... 30
6.1 Trouble shooting....................................................................................... 30
6.2 Servicing.................................................................................................... 35
7. REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL
FOR AIR CONDITIONERS USING R410A...................................................... 36
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1
1 GENERAL INFORMATION
1.1 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.
(1) Remote control flap
The flap can be automatically controlled by operating wireless remote 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(
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.
) ”, it will either automatically decide operation mode such as cooling, heating
RUN light
TIMER light
ON
1 time flash
2 time flash
6 time flash
Heat exchanger sensor error
Room temperature sensor error
Indoor fan motor error
1.2 How to read the model name
Example : SR K 20 H G - S
RUN light
keeps flashing
RUN light
ON
TIMER light Outdoor (LED)
1 time flash
2 time flash
4 time flash
2 time flash
5 time flash
6 time flash 6 time flash
OFF
OFF
OFF
2 time flash
5 time flash
R410A models
Series No.
Heat pump type
Product capacity
Wall mounted type
Split type room air-conditioner
Outdoor temperature sensor error
Outdoor unit heat exchanger
sensor error
Discharge pipe sensor error
Trouble of outdoor unit
Over heat of compressor
Error of signal transmission
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1
2 SELECTION DATA
2.1 Specifications
Model SRK20HG-S (Indoor unit)
SRC20HG-S (Outdoor unit)
Item
Cooling capacity
Heating capacity
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.64
Running current (Cooling) A 3.1/3.0/2.9
Heating input kW 0.61
(1)
Running current (Heating) A 3.0/2.9/2.8
Inrush current A 18.9
COP Cooling: 3.23 Heating: 3.64
Operation data
Noise level
Exterior dimensions
Height × Width × Depth
Color Fine snow Stucco white
Net weight kg 8.5 29
Refrigerant equipment
Compressor type & Q’ty
Motor kW – 0.65
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant
Refrigerant oil R 0.35 (MA68)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty
Motor W 14 14
Air flow (at High)
Air filter, Q’ty Polypropylene net (washable) × 2–
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch
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: φ9.52 (3/8″)
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4 m
Refrigerant
piping
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Connection wiring
Accessories (included)
Optional parts –
Notes (1) The data are measured at the following conditions.
(1)
(1)
Power level 52 60
(3)
Operation DB WB DB WB
The piping length is 7.5 m.
(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.)
Sound level Hi: 34 , Me: 30 , Lo: 27 46
Cooling
Power level
Sound level Hi: 34 , Me: 31 , Lo: 27 46
Heating
(Cooling) 7.5 27
(Heating)
Size × Core number 1.5 mm2 × 4 cores (Including earth cable)
Connecting method Terminal block (Screw fixing type)
Item Indoor air temperature Outdoor air temperature
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
Model
W 2070
W 2220
dB
mm
kg R410A 0.95 (Pre-Charged up to the piping length of 15m)
CMM
Mounting kit, Clean filter (Natural enzyme filter × 1, Photocatalytic washable deodorizing filter × 1)
SRK20HG-S SRC20HG-S
52 60
268 × 790 × 199 540 × 780 × 290
– RM-B5077MNE4 (Rotary type) × 1
Tangential fan × 1 Propeller fan × 1
7.5 27
Wireless-Remote control –
Frost protection, Serial signal error protection, Compressor overheat protection,
High pressure control, Indoor fan motor error protection
Gas line : 0.33 m
(220/230/240V)
–
Standards
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2
Model SRK28HG-S (Indoor unit)
SRC28HG-S (Outdoor unit)
Item
Cooling capacity
Heating capacity
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 0.81
Running current (Cooling) A 3.8/3.7/3.6
Heating input kW 0.77
(1)
Running current (Heating) A 3.7/3.5/3.3
Inrush current A 17.2
COP Cooling: 3.21 Heating: 3.64
Operation data
Noise level
Exterior dimensions
Height × Width × Depth
Color Fine snow Stucco white
Net weight kg 8.5 31
Refrigerant equipment
Compressor type & Q’ty
Motor kW – 0.7
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant
Refrigerant oil R 0.35 (RB68A)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty
Motor W 14 15
Air flow (at High)
Air filter, Q’ty Polypropylene net (washable) × 2–
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch
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: φ9.52 (3/8″)
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4 m
Refrigerant
piping
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Connection wiring
Accessories (included)
Optional parts –
Notes (1) The data are measured at the following conditions.
(1)
(1)
Power level 56 60
(3)
Operation DB WB DB WB
The piping length is 7.5 m.
(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.)
Sound level Hi: 39, Me: 33, Lo: 30 46
Cooling
Power level
Sound level Hi: 40, Me: 33, Lo: 29 46
Heating
(Cooling) 8.5 29
(Heating)
Size × Core number 1.5 mm2 × 4 cores (Including earth cable)
Connecting method Terminal block (Screw fixing type)
Item Indoor air temperature Outdoor air temperature
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
Model
W 2600
W 2800
dB
mm
kg R410A 0.85 (Pre-Charged up to the piping length of 15m)
CMM
Mounting kit, Clean filter (Natural enzyme filter × 1, Photocatalytic washable deodorizing filter × 1)
SRK28HG-S SRC28HG-S
55 60
268 × 790 × 199 540 × 780 × 290
– 5PS102DAB (Rotary type) × 1
Tangential fan × 1 Propeller fan × 1
10.0 29
Wireless-Remote control –
Frost protection, Serial signal error protection, Compressor overheat protection,
High pressure control, Indoor fan motor error protection
Gas line : 0.33 m
(220/230/240V)
–
Standards
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3
Model SRK40HG-S (Indoor unit)
SRC40HG-S (Outdoor unit)
Item
Cooling capacity
Heating capacity
Power source 1 Phase, 220/230/240V, 50Hz
Cooling input kW 1.12
Running current (Cooling) A 5.3/5.2/5.1
Heating input kW 1.15
(1)
Running current (Heating) A 5.4/5.3/5.2
Inrush current A 25.2
COP Cooling: 3.21 Heating: 3.41
Operation data
Noise level
Exterior dimensions
Height × Width × Depth
Color Fine snow Stucco white
Net weight kg 8.5 38
Refrigerant equipment
Compressor type & Q’ty
Motor kW – 1.1
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant
Refrigerant oil R 0.43 (RB68A or Freol Alpha 68M)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty
Motor W 14 22
Air flow (at High)
Air filter, Q’ty
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch
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 connecting
Attached length of piping Liquid line: 0.4 m
Refrigerant
piping
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Connection wiring
Accessories (included)
Optional parts –
Notes (1) The data are measured at the following conditions.
(1)
(1)
Power level 57 66
(3)
Operation DB WB DB WB
The piping length is 7.5 m.
(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.)
Sound level Hi: 40, Me: 38, Lo: 34 49
Cooling
Power level
Sound level Hi: 40, Me: 38, Lo: 34 52
Heating
(Cooling) 9.0 32
(Heating)
Size × Core number 1.5 mm2 × 4 cores (Including earth cable)
Connecting method Terminal block (Screw fixing type)
Item Indoor air temperature Outdoor air temperature
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612
Model
W 3600
W 3920
dB
mm
kg R410A 1.15 (Pre-Charged up to the piping length of 15m)
CMM
Mounting kit, Clean filter (Natural enzyme filter × 1, Photocatalytic washable deodorizing filter × 1)
SRK40HG-S SRC40HG-S
56 63
268 × 790 × 199 540 × 780 × 290
– 5KS150DBQ01 (Rotary type) × 1
Tangential fan × 1 Propeller fan × 1
10.0 32
Polypropylene net (washable) × 2
Wireless-Remote control –
Frost protection, Serial signal error protection, Compressor overheat protection,
High pressure control, Indoor fan motor error protection
Gas line : 0.33 m
(220/230/240V)
–
–
Standards
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4
2.2 Range of usage & limitations
Models
Item
Indoor return air temperature
(Upper, lower limits)
Outdoor air temperature
(Upper, lower limits)
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
All models
Refrigerant line (one way) length Max. 15m
Vertical height difference between
outdoor unit and indoor unit
Max. 10m (Outdoor unit is higher)
Max. 10m (Outdoor unit is lower)
Power source voltage Rating ± 10%
Voltage at starting Min. 85% of rating
Frequency of ON-OFF cycle
Max. 10 times/h
(Inching prevention 3 minutes)
ON and OFF interval Max. 3 minutes
2.3 Exterior dimensions
(1) Indoor unit
Models All models
39.3
200
43.2
44.5
102.5
53.5
A
→
790
202450138
133.5450206.5
585
Pipng for Gas
20, 28 : ø9.52
( )
40 : ø12.7
Pipng for Liquid 448.6 (ø6.35)
Drain hose 520 (ø16)
102.5
53.5
380.6
268
44.5
Terminal block
7.5
17.5
252.2
45
8.3
Unit: mm
199
60
3
Piping hole right(left)
60
9
45
788
27
60
45
VIEW A
Piping hole (ø65)
Piping hole (ø65)
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5
(2) Outdoor unit
Models All models
313.1
43.1
Drain holes (ø20)
50
12
23.5312.5
290
111.4
540
99.4
14
349.5
439.1
780
61.9
2-16×12
350
14
18.9165.1510104.9
Terminal block
Service valve (Liquid)
138.4
42.595.9
Flare connection ø6.35 (1/4'')
33.5
40
40
˚
˚
Service valve (Gas)
Flare connection
20, 28: ø9.52 (3/8'')
40: ø12.7 (1/2'')
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2.4 Piping system
Models SRK20HG-S, 28HG-S, 40HG-S
Room temp.
sensor
Heat
exchanger
Flare connecting
Heat
exchanger
sensor
Flare connecting
Piping
(Gas)
ø9.52
Piping
(Liquid)
ø6.35
Outdoor unitIndoor unit
Service valve
(Gas)
Check joint
4 way valve
Muffler
Service valve (Liquid)
Discharge temp.
sensor
Strainer
Cooling cycle
Heating cycle
Compressor
Capillary tube Capillary tube
Electronic
expansion valve
Accumulator
Outdoor air
temp. sensor
Heat
exchanger
Heat exchanger
sensor
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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
1.3
1.2
1.1
1.0
0.9
Coefficient of cooling &
Heating capacity in
relation to temperature
0.8
0.7
0.6
43
40
35
˚C D.B.
30
temperature
25
Outdoor air D.B.
Cooling operation
21
Cooling
Heating
Applicable range
16 18 20 22 24
ISO-T1 Standard ConditionIndoor air W.B. temperature ˚C W.B.
27
25
20
˚C D.B.
temperature
15
Indoor air D.B.
Heating operation
1005-5
ISO-T1 Standard ConditionOutdoor air W.B. temperature ˚C W.B.
20
15
(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.
Piping length [m]
Cooling
Heating
1.0
1.0
7
10
0.99
1.0
15
0.975
1.0
(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.
Air inlet temperature of
outdoor unit in ˚C WB
Adjustment coefficient
-5
0.91-30.88-10.8610.8730.9251.00
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SRK20HG-S 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 = 2070 ✕ 0.975 ✕ 1.0 = 2018 W
SRK20HG-S
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8
Length 15m
Factor by air
temperatures
BR
BR
LB
G
Y/G
Y/G Y/G
Y/G
Th1 Th2
R-AMP
WIRELESS
DISPLAY
WH
WH
WH
3
ZNR
N
CNGCNE
250V 3.15A
F
CNM
BK
BK BK
52C
52C-3
1
5
52C-4
BACK UP SW
822
5
U
FM
I
SM
J
RD
RD RD
TB TB
3
2/N
1
3
2/N
1
EXCHANGER
HEAT
CNW
CFI
IC15
CNU
WH
RD
BR
3
52C
Printed circuit
board
BK
BL
BR
Y
WH
LB
Y/G
RD
Color symbol
Black
Blue
Brown
Yellow
White
Light blue
Yellow/Green
Red
Meaning of marks
Symbol
Parts name
Symbol
Parts name
Symbol
Parts name
CM
F
FM
I
FM
O
SM
Th
1
Compressor motor
Fuse
Fan motor (Indoor)
Fan motor (Outdoor)
CFI
CFO
Capacitor for FM
I
Capacitor for FM
O
Motor Protector for CM
Magnetic contactor
Auxiliary relay
Flap motor
Room temp.sensor
Th
2
Heat exch.sensor (Indoor unit)
Th
4
Th
5
Th
6
ZNR
20S
DS
52X
1-3
Heat exch.sensor (Outdoor unit)
TB Terminal block
52C
51C
Outdoor air temp.sensor
Discharge pipe temp.sensor
Varistor
4 way valve (coil)
Diode stack
Power source
1 Phase
220/230/240V 50Hz
Outdoor unit
Indoor unit
D.S
CFO
Y
RD
CM2
RD
J
WH
N
BK
L
WH
CM1
52X1
BK
Y
WH
CC
CM
52X2
3
5
CNU
1
1
CNE
FMo
EEV
Th6
Th4
CNG
Th5
250V 3.15A
F
CNB
20S
BK
51C
52X3
3
6
PRINTED CIRCUIT
BOARD
ZNR
U
52X1
52X2
52X3
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3 ELECTRICAL DATA
3.1 Electrical wiring
Models SRK20HG-S, 28HG-S, 40HG-S
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
4.1 Operation control function by remote control switch
Remote control
Models All models
◆ Operation selection
FAN SPEED button
Each time the button is pushed, the
indicator is switched over in turn.
HI POWER/ECONO button
This button changes the HIGH POWER/
ECONOMY mode.
TEMPERATURE button
This button sets the room temperature.
(This button changes the present time and
TIMER time.)
ON TIMER button
This button selects ON TIMER operation.
SLEEP button
This button selects SLEEP operation.
CLEAN switch
This switch changes the CLEAN mode.
The above illustration shows all controls, but in practice
•
only the relevant parts are shown.
OPERATION MODE select button
Each time the button pushed, the
indicator is switched over in turn.
ON/OFF (luminous) button
Press for starting operation, press again
for stopping.
AIR FLOW (UP/DOWN) button
This button changes the air flow (up/down) mode.
OFF TIMER button
This button selects OFF TIMER operation.
RESET switch
Switch for resetting microcomputer and
setting time.
CANCEL button
This button cancels the ON timer, OFF
timer, and SLEEP operation.
◆ Indication selection
CLEAN indicator
Indicates during CLEAN operation.
SLEEP indicator
Indicates during SLEEP operation.
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.
HI POWER/ECONO MODE indicator
Indicates during HIGH POWER/ECONOMY
mode operation.
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10
ON/OFF TIMER indicator
Indicates during ON/OFF TIMER operation.
OPERATION MODE indicator
Indicates selected operation with lamp.
[
(Auto)•(Cool)• (Heat) •(Dry)]
TIME indicator
Indicates present time or timer setting time.
AIR FLOW indicator
Shows selected flap mode.
-
Unit indication selection
Models All models
RUN light (green)
Illuminates during operation
and CLEAN operation.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
ECONO light (orange)
Illuminates during ECONOMY operation.
4.2 Unit ON/OFF button
When the remote control batteries become weak, or if the remote control is lost or malfunctioning, this button may be used to turn the
unit on and off.
(1) Operation
Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.
(2) 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
Operation mode
Room temperature
setting
Fan speed Flap
Timer switch
Cooling About 24ºC
Thermal dry About 24ºC Auto Auto Continuous
Heating About 26ºC
Unit ON/OFF button
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.
If the jumper wire (J7) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)
(3)
Jumper wire (J7)
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11
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4.4 Custom cord switching procedure
If two wireless remote controls 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 control using the following procedure. Be sure to modify both boards. If only
one board is modified, receiving (and operation) cannot be done.
(1) 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.
(2) Modifying the wireless remote control
(a) Remove the battery.
(b) Cut the jumper wire shown in the figure at right.
Cut
Jumper wire (J6)
4.5 Flap control
Control the flap by AIRFLOW button on the wireless remote control.
(1) Swing flap
Flap moves in upward and downward directions continuously.
(2) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(3) Memory flap (Flap stopped)
When you press the AIRFLOW button once while the flap is operating, it stops swinging at an angle. Since this angle is memorized
in the microcomputer, the flap will automatically be set at this angle when the next operation is started.
¡ Recommendable stopping angle of the flap
COOL•DRY
Horizontal
blowing
HEAT
Slant forward
blowing
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12
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4.6 Timer operation
(1) Comfortable timer setting (ON timer)
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.)
At cooling
At heating
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 operate when in the Dry or Auto Dry mode.
However, the operation in item (1) does operate in the Auto Dry 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
3 < Room temp. – Setting temp. 1 < Room temp. – Setting temp. 3 Room temp. – Setting temp. 1
+5 No change –5
3 < Setting temp. – Room temp. 2 < Setting temp. – Room temp. 3 Setting temp. – Room temp. 2
+5 No change –5
Operation starting time
<
=
<
=
Corrects the starting time of next operation by
calculating the temperature difference.
¡ If the difference (= Setting temperature – Room tempera-
ture) is 4ºC, the correction value is found to be +5 minutes 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
<
=
<
=
Time
15 min. 10 min. 5 min.
earlier earlier earlier
Setting time
(2) Sleep timer operation
Pressing the SLEEP button causes the temperature to be controlled as shown in the following chart with respect to the set
temperature.
Cooling
Temperature
setting (˚C)
Timer operation
(time)
+
1.0
0
-1.0
0 1.0 2.0
Start
Heating
Temperature
setting (˚C)
Timer operation
(time)
0
-1.0
-2.0
-3.0
-6.0
0 0.5 1.0 2.0
Start
(3) OFF timer operation
The Off timer can be set at a specific time (in 10-minute units) within a 24-hour period.
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13
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4.7 Outline of heating operation
(1) Operation of major functional components
Functional
components
Indoor fan motor
Flaps
Display
52C
Outdoor fan motor
4-way valve
(2) Fan speed switching
Fan speed switching
Flow control
Swing flap
Swing stop
(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.
Item
When the compressor
command is OFF
ON
ON or OFF
Lights up
ON
Depending on the stop mode
AUTO HIGH MED
Auto fan control
Speed 7
When the compressor
command is ON
ON or OFF
Lights up
Speed 7
Speed 7
Speed 5
ON
ON
ON
ON
Speed 5
Speed 5
When the compressor goes
OFF due to an anomalous stop.
OFF
Stop position control
Lights up or flashes
Depending on the stop mode
LOW
Speed 3
Speed 3
Speed 3
-5 -4 -3 -2 -1 0
Thermostat setting point
(3) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
ON
Set temp.
OFF
+1
Room temp.
(4) Hot keep
Compressor
Outdoor fan
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
Speed 9
Speed 7
Speed 5
Speed 3
OFF
Auto fan control,
or the set fan speed
Indoor heat exchanger temp. (˚C)
-
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14
3430252015<SRK20HG-S>
4034302515<SRK28HG-S>
4337302318<SRK40HG-S>
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