Mitsubishi Heavy Industries SRK28HJ User manual

WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Split system, air to air heat pump type)
SRK28HJ
SRK40HJ
Collection data
Manual No. '06 • SRK -T-058
   
http://splitoff.ru/tehn-doc.html
, ,  , .

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 ................................................................. 4
2.3 Exterior dimensions ................................................................................ 4
2.4 Piping system .......................................................................................... 6
2.5 Selection chart ......................................................................................... 7
3 ELECTRICAL DATA....................................................................................... 8
3.1 Electrical wiring ....................................................................................... 8
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .................10
5 APPLICATION DATA .....................................................................................20
5.1 Selection of location for installation......................................................21
5.2 Installation of indoor unit........................................................................22
5.3 Installation of outdoor unit .....................................................................24
5.4 Refrigerant piping....................................................................................24
5.5 Test run.....................................................................................................26
5.6 Precautions for wireless remote controller installation
and operation ...........................................................................................26
6 MAINTENANCE DATA...................................................................................27
6.1 Trouble shooting......................................................................................27
6.2 Servicing...................................................................................................31
6.3 Power supply remote operation .............................................................32
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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.
¡AUTO (Natural flow) : 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.
1.2 How to read the model name
Example : SR K 40 H J
Series No.
Heat pump type
Product capacity
Wall mounted type
Split type room air-conditioner
Abnormality of room
temperature thermistor.
TIMER lamp is
light up.
RUN lamp is flashing.
(1 Time flash.)
RUN lamp is flashing.
(2 Time flash.)
Abnormality of heat
exchanger thermistor.
Abnormality of indoor
fan motor.
RUN lamp is flashing.
(6 Time flash.)
t
t
t
Abnormality of outdoor
unit.
RUN lamp is light
up.
TIMER lamp is flashing.
(5 Time flash.)
t
No lamps will flashing
when the unit is operating.
}
    : http://splitoff.ru/tehn-doc.html

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2 SELECTION DATA
2.1 Specifications
Model SRK28HJ (Indoor unit)
SRC28HJ (Outdoor unit)
Item
Model SRK28HJ SRC28HJ
Cooling capacity(1) W 2500
Heating capacity(1) W 2900
Power source 1 Phase, 220/230V, 50Hz
Cooling input kW 0.94
Running current (Cooling) A 4.3
Heating input kW 0.88
Running current (Heating) A 4.0
Inrush current A 17.3
COP cooling : 2.65 Heating : 3.30
Cooling Sound level 41 49
Noise level Power level dB 55 63
Heating Sound level 41 49
Power level 55 63
Exterior dimensions
Height x Width x Depth mm 275 x 790 x 190 542 x 790 x 250
Color Ivory white Polar white
Net weight kg 9 31
Refrigerant equipment
Compressor type & Q’ty –2P17C225ANB (Rotary type) x 1
Motor kW –0.75
Starting method – Line starting
Heat exchanger Louver fins & inner grooved tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 0.76 (Pre-Charged up to the piping length of 5m)
Refrigerant oil R0.35 (SUNISO 4GDID)
Defrost control MC control
Air handling equipment
Fan type & Q’ty Tangential fan x 1 Propeller fan x 1
Motor W 18 18
Air flow (at High) (Cooling) 7.5 28
(Heating) CMM 8.5 28
Air filter, Q’ty Polypropylene net (washable) x 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(Orange), ECONOMY(Green) –
Safety equipment –Dome mounted protector (for compressor)
Internal thermostat (for fan motor)
O.D mm(in) Liquid line: ø6.35 (1/4") Gas line: ø9.52 (3/8")
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4m
Gas line : 0.35m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2.5m (3 cores with Earth)
Connection Size x Core number 1.5mm2x 5 cores (Including earth cable)
wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit
Optional parts –
Notes (1) The data are measured at the following conditions.
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27°C19°C35°C24°C ISO-T1, JIS C9612
Heating 20°C– 7°C6°C ISO-T1, JIS C9612
(2) The operation data are applied to the 220V or 230V districts respectively
(3) The refrigerant quantity to be charged includes the refrigerant in 5m connecting piping.
(Purging is not required even in the short piping.)
If the piping length is longer, it is 5 to 15m, add 30g refrigerant per meter.
Operation data
(1)
Refrigerant piping
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Model SRK40HJ (Indoor unit)
SRC40HJ (Outdoor unit)
Item
Model SRK40HJ SRC40HJ
Cooling capacity(1) W 3600
Heating capacity(1) W 4200
Power source 1 Phase, 220/230V, 50Hz
Cooling input kW 1.39
Running current (Cooling) A 6.6
Heating input kW 1.35
Running current (Heating) A 6.4
Inrush current A 35.0
COP cooling : 2.59 Heating : 3.11
Cooling Sound level 42 50
Noise level Power level dB 56 64
Heating Sound level 42 50
Power level 56 64
Exterior dimensions
Height x Width x Depth mm 275 x 790 x 190 542 x 790 x 250
Color Ivory white Polar white
Net weight kg 9.5 37
Refrigerant equipment
Compressor type & Q’ty –RH231VXAC (Rotary type) x 1
Motor kW –1.1
Starting method – Line starting
Heat exchanger Louver fins & bare tubing
Refrigerant control Capillary tubes
Refrigerant(3) kg R22 1.08 (Pre-Charged up to the piping length of 5m)
Refrigerant oil R0.52 (DIAMOND MS-56)
Defrost control MC control
Air handling equipment
Fan type & Q’ty Tangential fan x 1 Propeller fan x 1
Motor W 18 20
Air flow (at High) (Cooling) 8.5 28
(Heating) CMM 9.0 28
Air filter, Q’ty Polypropylene net (washable) x 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(Orange), ECONOMY(Green) –
Safety equipment –Dome mounted protector (for compressor)
Internal thermostat (for fan motor)
O.D mm(in) Liquid line: ø6.35 (1/4") Gas line: ø12.7 (1/2")
Connecting method Flare connecting
Attached length of piping Liquid line: 0.4m
Gas line : 0.35m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2.5m (3 cores with Earth)
Connection Size x Core number 1.5mm2x 5 cores (Including earth cable)
wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit
Optional parts –
Notes (1) The data are measured at the following conditions.
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27°C19°C35°C24°C ISO-T1, JIS C9612
Heating 20°C– 7°C6°C ISO-T1, JIS C9612
(2) The operation data are applied to the 220V or 230V districts respectively
(3) The refrigerant quantity to be charged includes the refrigerant in 5m connecting piping.
(Purging is not required even in the short piping.)
If the piping length is longer, it is 5 to 15m, add 30g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
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2.2 Range of usage & limitations
Indoor intake air temperature
(Upper, lower limits)
Total one way piping length Max. 15m
All models
Refertotheselectionchart.
Compressor
stop/start
frequency
Power source
voltage
1 cycle time
Stop time
Voltage fluctuation
Voltage drop during start
Interval unbalance
Within±3 ％ ofratedvoltage
Within±15 ％ ofratedvoltage
Within±10 ％ ofratedvoltage
3 minormore
6minormore(fromstoptostoporfromstarttostart)
Max. 5m
Max. 5m
Outdoor air temperature
(Upper, lower limits)
Difference in
height between
indoor and outdoor
units
When above outdoor unit
When below outdoor unit
Item
Model
2.3 Exterior dimensions
(1) Indoor unit
Model SRK28HJ
Unit: mm
15
67
51
62 18
780
VIEWA
15760
170 450 170
Terminalblock
PipingforGas
¯ 9.52)390
PipingforLiquid ¯ 6.35)440
Drainhose600
¯ 16)
Pipinghole
¯ 65)
Pipinghole
¯ 65)
Pipingholeright left)
190 3
187.5 61
46
9260
37
6
36
56
9
49
A790
275
Remote controller
    : http://splitoff.ru/tehn-doc.html

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Model SRK40HJ
Unit: mm
(2) Outdoor unit
Models SRC28HJ, 40HJ
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
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+ ,()+*
 ,()*
Unit: mm
15
67
51
62 18
780
VIEWA
15760
170 450 170
Terminalblock
PipingforLiq id(¯6.35)440
Drainhose600(¯16)
Pipinghole
(¯65)
Pipinghole
(¯65)
Pipingholeright(left)
190 3
187.5 61
46
9260
37
6
36
569
49
PipingforGas(¯12.7)390
Remote controller
A790
275
    : http://splitoff.ru/tehn-doc.html

Model SRK40HJ
2.4 Piping system
Model SRK28HJ
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'
()

&
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*
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,
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
Indoor unit Outdoor unit
Heatexchanger
Strainer
Servicevalve(Liquid)
Flareconnecting
Servicevalve(Gas)
Room
temperature
thermistor
Piping(Gas)
¯12 7
Piping(Liquid)
¯6 35
Flareconnecting
Check
joint
4wayvalve
Suction
Capillarytube
Checkvalve
Heatexchanger
Compressor Accumulator
Discharge
Heat
exchanger
thermistor
Coolingcycle
Heatingcycle
Indoor unit Outdoor unit
Defrost
thermostat
Highpressureswitch(63H)
(forfanmotorcontrol)
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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.
(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.

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
    










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









 Indoor air W.B. temperature °C W.B.
Heating
Cooling

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.












Airinlettemperatureof
outdoorunitinûCWB
Adjustmentcoefficient
-10
0.95
-9
0.94
-7
0.93
-5
0.91
-3
0.88
-1
0.8
1
0.87
3
0.92
5
1.00
Net capacity = Capacity shown on specification Correction factors as follows.
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3 ELECTRICAL DATA
3.1 Electrical wiring
Model SRK28HJ
52C 52X452X5
FMI
FM
20S FMo CM
Power source
1 Phase 220/230V 50Hz
Wireless
R-Amp
Display
Printed circuit board
Indoor unit Outdoor unit
Color symbol
BK Black
BL Blue
BR Brown
RD Red
OR Orange
WH White
Y/GN Yellow/Green
Meaning of marks
Symbol Parts name Symbol Parts name
Cc Capacitor for CM Th1, 2 Thermistor
CFICapacitor for FMITr Transformer
CFOCapacitor for FMOZNR Varistor
CM Compressor motor 20S 4 way valve, coil
FFuse 51C Motor protector for CM
FMIFan motor (Indoor unit) 52C Magnetic contactor for CM
FMOFan motor (Outdoor unit) 52X4, 5 Auxiliary relay
FM Flap motor
Table of relay operations
Operation
Relay Control Cooling Heating Defrost
symbol part
52X420S × ×
52X5FMO×
52C CM
Notes (1) : denotes magentized relay ×: denotes demagnetized relay
(2) Th1 is room temperature thermistor. Th2(the heat exchanger thermistor) is the hot start, hot keep, and frost prevention thermistor. (for details, refer to pages
14, 15, 17 )
    : http://splitoff.ru/tehn-doc.html

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Model SRK40HJ
Notes (1) : denotes magnetized relay ×: denotes demagnetized relay
(2) Th1 is room temperature thermistor. Th2(the heat exchanger thermistor) is the hot start, hot keep, and frost prevention thermistor.
(for details, refer to pages 14,15,17)
(3) Preset values:
23DH (defroster stop thermostat): opens at over 14˚C
63H (overload protection high pressure switch during heating): closes at 2.02 / opens at 2.41 (MPa)
52C
F
250V
3.15A
52X 4
FM I
FM
52X 6
52X 5 20S
FMo CM
Power source
1 Phase 220/230V 50Hz
Y/GN
Y/GN
BL
BR
BR
WH
RD
CNC
Wireless
R-Amp
Display
1
5
3
CNB
Tr
CFI
Printed circuit board
ZNR
OR
WH
BK
CNU
CNECND CNG
BKBK
BK
BK BK
BK
WHWH
WH OR WH BL
BK
WH WH RD RD RD
RD
CNWCNM
Sh1
5 C3 5 C4 0S 3D
Th1
Th
BK
T
63H
6
4
6
BK
Sh
OR
CFo
7
87
BK
Cc
SR
C
51C3D H
1
3
Sh1
8
RD
5 X
5
5 X 6
T1
PC
5 C
5 X 4
1
WH
OR
3
RD
BK
BK
BK
BK
WH
BL
RD
4
1
3
4
Indoor unit Outdoor unit
Color symbol
BK Black
BL Blue
BR Brown
RD Red
OR Orange
WH White
Y/GN Yellow/Green
Meaning of marks
Symbol Parts name Symbol Parts name
Cc Capacitor for CM Th1,2 Thermistor
CFICapacitor for FMITr Transformer
CFOCapacitor for FMo ZNR Varistor
CM Compressor motor 20S 4 way valve, coil
FFuse 51C Motor protector for CM
FMIFan motor (Indoor unit) 52C Magnetic conductor for CM
FMOFan motor (Outdoor unit) 52X4,5,6 Auxiliary relay
FM Flap motor 63H High pressure switch
PC Photo coupler 23DH Defrost thermostat
Table of relay operations
Relay
symbol
Control
part
Operation
52X 4 20S
Cooling Heating Defrost
52X 5
FM O
52X 6
52C CM
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4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
(1) Remote controller
TIMER RUN
HI POWER ECONO
Indoor unit indicator
HI POWER light (orange)
Illuminates during HI POWER operation.
ECONOMY light (green)
Illuminates during ECONOMY operation.
RUN (HOT KEEP) light (green)
•Illuminates during operation.
•Flashs at air flow stop due to the ‘HOT KEEP’.
TIMER light (yellow)
Illuminates during TIMER operation.
FAN SPEED ON/OFF MODE
TEMP AIR FLOW
SET TIMER TIMER
ACL
HI POWER
ECONO
CONT HI POWER ECONO
ON OFF TIMER
AUTO
HI
MED
LO
FAN SPEED indicator
Indicators the ¡for the fan speed which has
been set.
ON-TIMER • OFF-TIMER indicator
FAN SPEED button
Each time the button is pushed, the ¡
indicator is switched over in turn.
HI POWER button
This button changes the HI POWER
operation.
SET TEMPERATURE button
This button sets the room temperature.
ECONOMY button
This button changes the ECONOMY operation.
SET TIMER button
This button sets the ON TIMER time or SLEEP
time.
¡Above figure shows all indications for the
purpose of explanation, but practically only
the pertinent parts are indicated.
HI POWER operation indicator
Indicators during HI POWER operation.
ECONOMY operation indicator
Indicators during ECONOMY operation.
Operation switch over indicator
Indicators the ¡for the operation which has
been set.
AIR FLOW indicator
Indicates selected flap mode.
OPERATION MODE select button
Each time the button is pushed, the ¡
indicator is switched over in turn.
ON/OFF button
This button, when pressed, starts operation
and stops when repressed.
AIR FLOW button
This button changes the flap mode.
TIMER button
The button selects ON TIMER operation,
OFF-TIMER operation or normal operation.
Reset switch
Switch for resetting microcomputer.
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(2) Flap control
Control the flap by the AIRFLOW button on the wireless remote control
(a) AUTO (Natural flow)
The flap will be automatically set to the angle of air flow best to operation mode
1) Starting time of operation
2) 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
In case of cooling and
dry operation
Stops at the level
position for one minute.
Sway operation
¡The flap operation as shown above
will repeated.
In case of heating
operation
Sway operation
¡When the room temperature controller (thermo-
stat) is activated, horizontal blowing is applied
to prevent cool wind from blowing out.
Air flow when flaps are used
downward in heating
Warm are naturally rises.
Warm air is sent to the floor, creating the ideal room tem-
perature variation is created in which the feet are warmer and
the air around the head slightly cooler.
(c) Swing flap
Flap moves in upward and downward directions continuously.
COOL.DRY Horizontal
blowing
HEAT
Slant forward
blowing
Stops at the position
for three minutes
and fifty seconds
stst
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(3) Back-up Switch
When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this switch may be used to
turn the unit on and off.
(a) Operation
Push the switch 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
thermistor), whether to go into the cooling, thermal dry or heating modes.
Function Room temperature
Operation mode
setting Fan speed Flap Timer switch
Cooling About 26ºC
Thermal dry About 25ºC Auto Natural flow Continuous
Heating About 25ºC
On operating in automatic operation mode by back-up switch, functions show in the above table are not altered, white, the other micro-
computer control functions remain effective.
(4) AUTOMATIC operation
(a) When starting operation after more than 1 hour since operation stops
(Operation stop button ON or ON-Timer), this system operates indoor fan with Lo for 20 seconds checks room temperature
and allowing decision of operating mode automatically.
Note (1) Operating Mode is not altered due to change of room temperature.
When intended to change operating mode, switch operation change over dial to the intended mode.
(b) Established temperature (operate by the established temperature button on remote controller).
Wireless remote control signal (Indication)
-6 -5 -4 -3 -2 -1 ±0+1+2+3+4+5+6
Cooling 20 21 22 23 24 25 26 27 28 29 30 31 32
Thermal dry 19 20 21 22 23 24 25 26 27 28 29 30 31
Heating 19 20 21 22 23 24 25 26 27 28 29 30 31
Temperature
setting
(c) When switching to automatic operation during “Heating” “Cooling” “Dry” or when restarting with in 1 hour after stopping
with automatic operation mode, the former operating mode is selected. (In this case, 20 seconds Lo operation of indoor fan is
not performed). When the previous mode is in “FAN”, operation mode is to be set by the above mentioned chart.
Room temperature<21ºC 21ºC Room temperature<26ºC 26ºC Room temperature
Operation Mode Heating Dry Cooling
ON/OFF

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Note (1) The unit performs heating to the set time after 2.0 hours in the night time as shown right.
(8) Temperature adjustment
a) Temperature adjustment setting may be set between 18 and 30˚C.
b) The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
c) During the continuous mode, the compressor runs continuously in both cooling and heating. For thermal dry, please refer to
page 16.
(5) Comfort timer settings
Temperature is checked beginning 1 hour before the set time, and the power is turned on before the timer setting as necessary to
bring the temperature to the proper level by the set time.
Operation mode Room temperature thermistor (Th1)Operating start time (amount of time
previous to set time that operation begins)
Under 5˚C 60 mins.
Heating Under 10˚C 30 mins.
Under 15˚C 15 mins.
Over 15˚C 5 mins.
Over 40˚C 60 mins.
Cooling Over 35˚C 30 mins.
Over 30˚C 15 mins.
Under 30˚C 5 mins.
(6) Timer time setting
The turn-off timer and turn-on timer can be set for up to 12 hours in units of 1 hour.
(7) Night time turn off
Placing the timer to this setting changes the temperature setting of the indoor set button as follows:
Timer operation
(time)
Set temp. -Room temp.
(deg)
Start
Timer operation
(time)
Temperature
setting (˚C)
Start
Temperature
setting (˚C)
Heating
Cooling, thermaldry
OFF
ON
Compressor
outdoor fan
Compressor
outdoor fan
Room temp.
Set temp.
Compressor
outdoor fan
Room temp.
HeatingCooling
Set temp.
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Mode COOL HEAT FAN
Fan speed knob
AUTO See below
LOW Speed 1 (Speed 1) Speed 2 (Speed 2) Speed 1 (Speed 1)
MED Speed 2 (Speed 2) Speed 3 (Speed 3) Speed 2 (Speed 2)
HIGH Speed 3 (Speed 4) Speed 4 (Speed 5) Speed 3 (Speed 3)
Notes (1) Please refer to page 16 regarding dry operation.
(2) Fan speeds shown in brackets are shown for when continuing with set temperatures.
(9) Fan control
(a) Fan speed change
(10) 3 Hot system
When initiating heating operation, restoring thermostat, defrosting operation, the indoor fan motor and the thermostat is controlled
by micro computer in accordance with the room air temp, and temp, of the indoor heat exchanger.
By this blowing of cold air is prevented and comfortable heating operation is assured.
Controls of thermostat and indoor fan motor.
(a) HOT START (RUN (Hot keep) lamp flashing when the indoor fan is stopped)
1) Operation timing
a) When the compressor is starting. (when starting operation and resuming operation by restored thermostat)
b) When the defrosting operation is switched to the heating operation.
Set-
ting temp
Speed 2
Speed 4
Speed 1
Speed 3 Speed 3
Speed 4
Speed 2
Speed 2
Speed 3
Speed 1
Note (1) Please refer to page 16 regarding dry operation.
Temp. that compres-
sor stops in HOT
SPURT operation
AA
B
B
+3˚C
+1˚C
+2˚C
Temp. that compres-
sor stops in ordinary
operation
Thermo setting
RUN (HOT KEEP)
lamp flashing
Thermostat stop
Resume operation
HOT START HOT KEEPHOT SPURT
Room Temp.
Time
Indoor fan
stops
Indoor fan
stops
Expand
Defrosting operation
HOT START
HOT START
Defrosting
operation
Room temp.
(b) Fan speed knob: AUTO
¡The indoor fan is automatically controlled in accordance with the difference between the room temperature (detected by the
room temperature thermistor) and the thermostat setting as shown below.
Mode Heating Cooling Fan
18~30˚C
Thermostat setting point Thermostat setting point Thermostat setting point
Continuous Speed 5 Speed 4 Speed 3
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20 28 33 4338
(28)
(1)
 
   
 
  

2) Function
a) The indoor fan motor is controlled in accordance with the temperature of the indoor heat exchanger to send warm air
from the start.
b) When the air flow increases at heating starting as shown below, the temperature of the indoor heat exchanger become
lower since the intake air temperature is still low. By this the fan speed is decreased. In this case, in order to prevent
excessively ON/OFF switching of the fan motor, the controlling temperature is made different from the controlling
temperature for HOT KEEP.
Note (1) When the compressor
has stopped, the indoor
fan will stop at 28˚C
(b) HOT SPURT
1) Operation timing
When starting operation. (during start-up)
2) Function
The set temperature of the thermostat is increased by 2˚C to
stabilize the room temperature quickly. When starting heating,
since the surrounding wall and furniture is cold, if the compres-
sor is stopped by thermostat, the 3 min. delay timer operates, the temperature drops rapidly during the 3 min, and although
the thermostat has to resume operation, air conditioner would not start for those 3 min. (where marked *)
Restore the set temperature to the original value when the compressor is stopped once by the thermostat or 40 minutes have
elapsed since the operation start.
(c) HOT KEEP
1) Cold draft prevention (I)
a) Operation timing: While defrosting operation
b) Function: The indoor fan is stopped and RUN (HOT KEEP) lamp flashing.
2) Cold draft prevention (II)
a) Operation timing: When thermostat is switched to “off ”.
b) Function: The indoor fan operates as shown
below, and after the passage of a period of
either 5 minutes return to thermo. Control at
speed 1 operation.
Notes (1) When the thermostat does not reset within 5 minutes, reset it by operating the indoor fan motor at speed 1.
(2) The * marked speed 1 operation shows the case in which the thermostat is switched to off. While the defrosting operation the * marked operation
are not performed.
Temperature of indoor heat exchanger (˚C)
Com-
pressor
Indoor
fan
motor Set fan speed Stop Set fan speed
HOT
START
*Approx 5 min (1)
Temperature of the indoor heat exchanger (˚C )
Speed
2 or 3 Speed
1
Compressor stop
Stabilizing curve with
conventional unit
Stabilizing curve with
HOT SPURT.
Time
Setting temp.
Room temp.
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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.
(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
(11) DRY operation
(a) Choose the appropriate operation block area by the difference between room temperature and thermo-
stat setting temperature as shown below.
¡Operation block area
–2 0 +3
Room temp. – Setting temp.(deg)
(b) 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
Compressor
and
outdoor fan
Indoor fan
D Block
Compressor
and
outdoor fan
Indoor fan
C Block
20 seconds 20 seconds
minutes
minutes
Start Temperature check Start Temperature check
Operation block decision
Speed 1
OFF
OFF
08
ON
OFF
OFF
0 3 8
Speed 1
ON
OFF
OFF
0 4 8
ON
OFF
OFF
0 8
Compressor
and
outdoor fan
Indoor fan
B Block
Compressor
and
outdoor fan
Indoor fan
A Block
20 seconds
minutes
minutes
Start Temperature check Temperature check
Operation block decision
Start
Speed 1 Speed 1
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(12) Dew condensation prevention control for cooling operation
This prevents dew condensation, in the indoor unit, from occurring.
(a) Operating condition: when 52C 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 52C is off, or when dew condensation prevention control has been operating continuously for
30 minutes.
(13) Frost prevention for indoor heat exchanger [Preventing frost accumulation on the indoor heat exchanger]
During the Cooling or Dry operation in low room air temp. condition, evaporating temperature will decrease and consequently
indoor heat exchanger sometimes gets clogged with frost (or ice).
In order to prevent this trouble, compressor is stopped by under mentioned condition by indoor heat exchanger thermistor (Th2)
and timer (built into micro computer circuit) functions.
Also indoor fan is changed over to Lo speed.
CM, FMOstoppage condition
1Temperature of heat exchanger is
0˚C or lower.
2As least 10 minutes has passed
since the compressor started.
Indoor heat exchanger
temperature (˚C)
CM, FMOre-starting condition
1Temperature of heat exchanger is
7˚C or higher.
2As least 3 minutes has passed since
the compressor stopped.
Set fan
speed
(14) Microcomputer Controlled Timely Defrosting Operation
SSRK28HJ
(a) Defrost Start
Changes in the difference in temperature between the intake air temperature and the indoor heat exchanger temperature
causes frost to build up, at which time defrosting begins. However, defrosting will not occur when the total compressor
operation time or time after defrosting has ended is 40 minutes.
(b) Defrost End
After defrosting has continued for 3 minutes or 7 minutes (when thermal is off before defrosting), defrosting will end and
heating will begin again.
Device operation during defrosting
#
OFF
ON
OFF
ON
OFF
ON
OFF
ON
IndoorOutdoor
Indoor Fan
Operation Lamp
52 C
(Compressor)
52 X4
(Four Way Valve)
52 X5
(Outdoor Fan)
seconds
1 minute 2 minutes
Start Defrosting End Defrosting
Hot
Keep
Hot
Keep
Lit
Flashing
3 minutes or 7 minutes
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SSRK40HJ
(a) Defrost Start
Changes in the difference in temperature between the intake air temperature and the indoor heat exchanger temperature
causes frost to build up, at which time defrosting begins. However, defrosting will not occur when the total compressor
operation time or time after defrosting has ended is 40 minutes.
(b) Defrost End (heat exchanger temperature or timer)
1) What the heat exchanger temperature (detected by 23DH) reaches the value given below, defrosting is ended and
heating operation is returned to. Preset values: 14C˚
2) Operation will also return to heating operation when more then 10 minutes has passed since the starting of defrosting operation.
(15) Forced defrosting
To test forced defrosting in the operation test mode, the unit may be operated once in the forced defrost mode as shown below.
(1) Temporarily turn off the power source and then perform the following operation using the remote controller within 20
seconds after the power is turned back on.
Operation : Run Air flow : Swing
Fan speed : Low Timer switch : On timer ( )
Operation setting : Heating On time : 3H
Temperature setting : 19
(2) Defrost end
SSRK28HJ
When remote control operation is performed, defrosting will begin after the 3 minute timer operation ends. After 3 minutes
all operations will stop.
SSRK40HJ
When the remote control operation is performed, forced defrosting will start for 1 minute after the three minute timer opera-
tion ends. After that the defrost thermostat(23DH) will either tum OFF or the operation will stop after 10 minutes.
(16) High-Pressure Control
The indoor heat exchanger sensor detection temperature controls the outdoor fan and compressor.
#
OFF
ON
OFF
ON
OFF
ON
OFF
ON
IndoorOutdoor
Indoor Fan
Operation Lamp
52 C
(Compressor)
52 X4
(4 Way Valve)
Outdoor Fan
seconds
1 minute 10 minutes or 23DH OFF 2 minutes
Start Defrosting End Defrosting
Hot
Keep
Hot
Keep
Lit
Flashing
Device operation during defrosting
¡When the Indoor Heat Exchanger
Temperature Is ≥54˚C
SSRK28HJ
=
¡When the Indoor Heat Exchanger
Temperature Is ≥61˚C
=
Outdoor fan
Indoor Heat Exchanger Temperature (˚C)
Compressor
Outdoor fan
Indoor Heat Exchanger Temperature (˚C)
48 54 48 61
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