Mitsubishi Heavy Industries SRK13ZEV-S4 User manual

-T·054
INVERTER WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Split system, air to air heat pump type)
SRK13ZEV-S4
SRK22ZEV-S4
ROOM AIR-CONDITIONING
TECHNICAL MANUAL & PARTS LIST

TECHNICAL MANUAL
1. SRK13ZEV-S4 .............................................................. 2
2. SRK22ZEV-S4 ............................................................ 60
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2
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CONTENTS
1.1 GENERAL INFORMATION......................................................................... 3
(1) Specific features ...................................................................................................... 3
(2) How to read the model name.................................................................................. 3
1.2 SELECTION DATA ..................................................................................... 4
(1) Specifications ......................................................................................................... 4
(2) Range of usage & limitations ................................................................................ 5
(3) Exterior dimensions ............................................................................................... 5
(4) Piping system ......................................................................................................... 6
(5) Selection chart ........................................................................................................ 7
1.3 ELECTRICAL DATA ................................................................................... 8
(1) Electrical wiring ...................................................................................................... 8
1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .............. 9
(1) Operation control function by remote control switch ......................................... 9
(2) Unit ON/OFF button ................................................................................................10
(3) Power blackout auto restart function ...................................................................10
(4) Custom cord switching procedure .......................................................................11
(5) Flap control .............................................................................................................11
(6) Comfortable timer setting ......................................................................................12
(7) Outline of heating operation.................................................................................. 12
(8) Outline of cooling operation.................................................................................. 15
(9) Outline of dehumidifying operation ......................................................................16
(10) Outline of automatic operation .............................................................................19
(11) Outline of fan operation .........................................................................................19
(12) ION operation ..........................................................................................................20
(13) Protective control function ....................................................................................20
1.5 APPLICATION DATA .................................................................................. 25
(1) Selection of location for installation.....................................................................26
(2) Installation of indoor unit ......................................................................................27
(3) Installation of outdoor unit ....................................................................................30
(4) Refrigerant piping...................................................................................................30
(5) Test run ....................................................................................................................31
(6) Precautions for wireless remote control installation and operation .................32
1.6 MAINTENANCE DATA ............................................................................... 33
(1) Troubleshooting procedures for electrical equipment........................................33
(2) Servicing .................................................................................................................44
1.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL
FOR AIR CONDITIONERS USING R410A ................................................ 45
(1) Outline .....................................................................................................................45
(2) Refrigerant piping installation...............................................................................46
(3) Installation, removal and servicing .......................................................................52
(4) Refrigerant recovery ..............................................................................................57
MODEL SRK13ZEV-S4

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3
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Over heat of compressor
Error of signal transmission
Outdoor fan motor error
1.1 GENERAL INFORMATION
(1) Specific features
The “MITSUBISHI HEAVY INDUSTRIES, LTD.” room air-conditioner: SRK series are of split and wall mounted type and the unit
consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling equip-
ment with operation control switch and the outdoor unit is composed of condensing unit with compressor.
(a) Inverter (Frequency converter) for multi-steps power control
¡Heating/Cooling
The rotational speed of a compressor is changed in step in relation to varying load, interlocked with the indoor and outdoor unit
fans controlled to change frequency, thus controlling the capacity.
¡Allowing quick heating/cooling operation during start-up period. Constant room temperature by fine-tuned control after the
unit has stabilized.
(b) Fuzzy control
¡Fuzzy control calculates the amount of variation in the difference between the return air temperature and the setting temperature
in compliance with the fuzzy rules in order to control the air capacity and the inverter frequency.
(c) Remote control flap
The flap can be automatically controlled by operating wireless remote control.
¡Air scroll (AUTO): 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.
(d) 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.
Outdoor heat exchanger sensor
error
Discharge pipe sensor error
Outdoor air temperature sensor
error
2 time flash
4 time flash
RUN light
keeps flashing
1 time flash
OFF
OFF
OFF
Trouble of outdoor unit
Over current
Current cut
2 time flash
3 time flash
RUN light
ON
1 time flash
2 time flash
3 time flash
1 time flash
5 time flash 5 time flash
TIMER light Outdoor (LED)
Room temperature sensor error
Indoor fan motor error
Heat exchanger sensor error
2 time flash
6 time flash
TIMER light
ON
1 time flash
RUN light
Rotor lock
6 time flash 6 time flash
7 time flash ON
2 time flash 7 time flash
RUN light
2 time flash
(2) How to read the model name
Example : SR K 13 Z EV - S4
R410A models
Series No.
Inverter type
Product capacity
Wall mounted type
Split type room air-conditioner

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4
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Item
Model SRK13ZEV-S4 SRC13ZEV-S4
Cooling capacity(1) W4000 (400~5000)
Heating capacity(1) W6000 (400~9000)
Power source 1 Phase, 220V, 50Hz
Cooling input kW 0.93 (0.105~1.5)
Running current (Cooling) A 5.5
Heating input kW 1.38 (0.095~2.490)
Running current (Heating) A 6.8
Inrush current A 6.8
COP Cooling: 4.30 Heating: 4.35
Noise level Cooling Sound level 46 47
Heating Sound level 46 47
Exterior dimensions
Height ×Width ×Depth mm 298 ×840 ×259 595 ×780 ×290
Color Cool white Stucco white
Net weight kg 12 39
Refrigerant equipment
Compressor type & Q’ty –5CS102XFA (Scroll type) ×1
Motor kW –1.1
Starting method –Line starting
Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing
Refrigerant control Capillary tubes + Electronic expansion valve
Refrigerant(3) kg R410A 1.35 (Pre-Charged up to the piping length of 15m)
Refrigerant oil R0.36 (RB68A)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan ×1 Propeller fan ×1
Motor W 33 34
(Cooling)
Air flow (at High) (Heating) CMM
Air filter, Q’ty Polypropylene net (washable) ×2–
Shock & vibration absorber –Cushion rubber (for compressor)
Electric heater ––
Operation control
Operation switch Wireless-Remote control –
Room temperature control Microcomputer thermostat –
Pilot light RUN (Green), TIMER (Yellow), JET/HI POWER (Green), ION (Green)
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: 0.54 m
Gas line : 0.47 m –
Insulation Necessary (Both sides)
Drain hose Connectable
Power source cord 2 m (3 cores with Earth)
Size ×Core number 1.5 mm2×4 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit, Clean filter (Allergen clear filter ×1, Natural enzyme filter ×1)
Optional parts –
Notes (1) The data are measured at the following conditions.
1.2 SELECTION DATA
(1) Specifications
Model SRK13ZEV-S4 (Indoor unit)
SRC13ZEV-S4 (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 220V districts respectively.
(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.
(Purging is not required even for the short piping.)
If the piping length is longer, when it is 15 to 25 m, add 20 g refrigerant per meter.
Operation data
(1)
Refrigerant
piping
Compressor overheat protection, Heating overload protection (High pressure control), Overcurrent protection,
Frost protection, Serial signal error protection, Indoor fan motor error protection, Cooling overload protection
The piping length is 7.5m.
(220V)

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(2) Range of usage & limitations
(3) Exterior dimensions
(a) Indoor unit
Model SRK13ZEV-S4
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length Max. 25m
SRK13ZEV-S4
Power source voltage Rating ±10%
Voltage at starting Min. 85% of rating
Frequency of ON-OFF cycle Max. 10 times/h
ON and OFF interval Max. 3 minutes
Outdoor air temperature
(Upper, lower limits)
Vertical height difference between
outdoor unit and indoor unit
Max. 15m (Outdoor unit is higher)
Max. 15m (Outdoor unit is lower)
Item
Model
Cooling operation : Approximately 21 to 32˚C
Heating operation : Approximately 15 to 30˚C
Cooling operation : Approximately 21 to 43˚C
Heating operation : Approximately
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5 to 21˚C
840
298
A
Piping hole right
259
9
44
right: 67 left : 60
3
60
60 14.5
813
603
44
44
60
60
VIEW A
44.5
47.5220.5
50
207.5
73.5
53.5
Piping hole (ø65) Piping hole (ø65)
Indoor unit
Installating board
Drain hose 515 (ø16)
Piping for gas 533.5 (ø9.52)
Piping for liquid 603.5 (ø6.35)
63.5
8.5
5.3 284.2
44.5
73.5
182.5
50
450
693
25

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(b) Outdoor unit
Model SRC13ZEV-S4
(4) Piping system
Model SRK13ZEV-S4
Outdoor unitIndoor unit
Heat
exchanger
Room temp.
sensor
Humidity
sensor
Heat
exchanger
Heat
exchanger
Solenoid
valve
Flare connecting
Heat
exchanger
sensor
Piping
(Liquid)
ø6.35
Piping
(Gas)
ø9.52
Check joint
4 way valve
Service valve (Liquid)
Flare connecting
Discharge pipe
temp. sensor
Cooling cycle
Heating cycle Outdoor air
temp. sensor
Heat exchanger
sensor
Compressor
uffler
M
Capillary tube Capillary tube
Strainer
Service valve
(Gas)
Electronic
expansion valve
14.4
595
96.5 42.5
35°
35°
90.6 29.7
340
13.5
312.5
14
17.5
164
286.4
290
45.4
49.6
463
62780
106 510
12
50
Drain holes
2-16 ×12
Ground
terminal
Terminal block
Service valve (Liquid)
Service valve (Gas)
Flare connection ø6.35 (1/4")
Flare connection ø9.52 (3/8")
Unit: mm

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(5) Selection chart
Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be
obtained in the following way.
Net capacity = Capacity shown on specification ✕ Correction factors as follows.
(a) Coefficient of cooling and heating capacity in relation to temperatures
(b) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor
units.
(c) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (a), (b) the heating capacity needs to be adjusted also with respect to the frosting on the
outdoor heat exchanger.
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SRK13ZEV-S4 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 = 4000 ✕0.975 ✕1.0 =3900 W
SRK13ZEV-S4 Length 15m Factor by air
temperatures
15
ISO-T1 Standard ConditionOutdoor air W.B. temperature ˚C W.B.
1005-5
16 18 20 22 24
20
ISO-T1 Standard ConditionIndoor air W.B. temperature ˚C W.B.
Heating
Applicable range
27
25
20
15
21
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
Cooling
Heating operation
Indoor air D.B.
temperature
˚C D.B.
Cooling operation
Outdoor air D.B.
temperature
˚C D.B.
Coefficient of cooling & Heating capacity in relation to temperature
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
20
0.965
1.0
25
0.95
1.0
Air inlet temperature of
outdoor unit in ˚CWB
Adjustment coefficient
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00

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1.3 ELECTRICAL DATA (1) Electrical wiring
Model SRK13ZEV-S4
Outdoor unit
Indoor unit
Printed circuit
board
TB TB
F (250V 20A)
BK
WH
RD U
V
W
BK
C2 S.IN R.IN
Re
G
WH
RD
Th4
Th5
Th6
CNB
CNE
CNA
CND
1
2
3
NP
Power
transistor
20S
EEV
FMo
DS
CM
Black
Brown
Red
Blue
White
Yellow/Green
BK
BR
RD
BL
WH
Y/GN
Yellow
Y
Color symbol
Meaning of marks
Symbol Parts name
CM Compressor motor
FFuse
FM
I
F
Fan motor (Indoor)
FMo
F
an motor (Outdoor)
SM
RE
Flap motor
Reactor
Symbol Parts name
Th
1
Room temp. sensor
Th
2
Heat exchanger sensor (Indoor unit)
Th
3
Humidity sensor
Th
4
Heat exchanger sensor (Outdoor unit)
Th 5
Outdoor air temp. sensor
Th
6
Discharge temp. sensor
Symbol Parts name
20S 4 way valve (coil)
ZNR Varistor
52C Magnetic contactor
DS Diode stack
EEV Electronic expansion valve
SV Solenoid valve
ZNR
250V
3A
F
CNM Printed
circuit
board
JEM-ACNFCNE
1
2
3
52C3
CNG
SJ
52C
52C4
4CNU
1
RD
RD
3
WH
WH
BK
BK
BK
6
5
BL
BL
BR
BL
Y
CNL
CNV
CNN
T4
ION
generator
Safety switch
Display
Wireless R-Amp
Back-up switch
Y/G
G
SV
SM
Th1 Th2 Th3
HA
FM
I
Heat
exchanger
Power source
1 Phase
220V 50Hz
( )

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1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
(1) Operation control function by remote control switch
TEMP
SLEEP
ECONO
ACL
ON OFF
DRY MODE
AIR FLOW
CANCEL
ion
START
JET/
JET
ECONO
H
AM PM
ON
SLEEP
LO
MED
HI
AUTO
FAN SPEED MODE
TIME
SET UP
TIMER
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.
ION button
This button selects ION operation.
ON/OFF button
Press for starting operation, press again for
stopping.
JET/HI POWER button
This button changes the JET/HI POWER mode .DRY MODE button
This button changes the DRY mode.
RESET switch
Switch for resetting microcomputer.
SLEEP button
This button selects SLEEP operation.
ECONO switch
This switch changes the ECONOMY mode.
TIME SET UP switch
This switch for setting the TIME.
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
SLEEP timer.
JET
ECONO
H
AM PM
ON
SLEEP
LO
MED
HI
AUTO
OPERATION MODE indicator
Indicates selected operation with lamp.
[ (Auto) • (Cool) • (Heat) • (Dry) • (Fan)]
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.
ECONOMY MODE indicator
Indicates during economy mode operation.
SLEEP indicator
Indicates during SLEEP operation.
ON TIMER indicator
Indicates during ON TIMER operation.
HI POWER MODE indicator
Indicates during Hi power mode operation.
Time indicator
Indicates present time or timer setting time.
DRY MODE indicator
Shows the various DRY modes.
START button
This button selects ON TIMER operation.
(Air scroll) (Flap stopped)
AIR FLOW button
This button changes the flap mode. When
pressed, this button changes the mode in the
following order:
AIR FLOW indicator
Shows selected flap mode.
SIndication section
Model SRK13ZEV-S4
Remote control
SOperation section

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(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.
(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 24ºC
Thermal dry About 25ºC Auto Auto Continuous
Heating About 26ºC
(3) Power blackout auto restart function
(a) Power blackout auto restart function is a function that records the operational status of the air-conditioner immediately prior to it
being switched off by a power cut, and then automatically resumes operations at that point after the power has been restored.
(b) The following settings will be cancelled:
(i) Timer settings
(ii) High-power operations
Notes (1) The power blackout auto restart function is set at on when the air-conditioner is shipped from the
factory. Consult with your dealer if this function needs to be switched off.
(2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the timer.
(3)
If the jumper wire (J1) is cut, auto restart is disabled. (See the diagram at right)
Unit ON/OFF button
ION light (green)
Illuminates during ION operation.
JET/HI POWER light (green)
Illuminates during JET/HIGH POWER operation.
RUN (HOT KEEP) light (green)
•Illuminates during operation.
•Blinks at air flow stop due to the ‘HOT KEEP’.
TIMER light (yellow)
Illuminates during TIMER operation.
Unit indication section
Model SRK13ZEV-S4
Jumper wire (J1)

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(5) Flap control
Control the flap by AIRFLOW button on the wireless remote control.
(a) Air scroll
The flap will be automatically set to the angle of air flow best to operation.
(i) Starting time of operation
(ii) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(b) Memory flap
While the flap is operating if the AIRFLOW button is pushed once, it stops swinging at an angle.
As this angle is memorized in the microcomputer, the flap will be automatically set to the angle when next operation is started.
¡Recommendable stopping angle of the flap
(c) Swing flap
Flap moves in upward and downward directions continuously.
sDuring cooling andt
dry operation
Thick line : Rapid movement
Thin line : Slow movement
Stops for approximately
5 seconds in the
horizontal position.
sDuring heating t
operation
Stops for approximately
5 seconds in this
position. Thick line : Rapid movement
Thin line : Slow movement
Horizontal
blowing
COOL•DRY
Slant forward
blowing
HEAT
(4) Custom cord switching procedure
If two wireless remote 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.
(a) Modifying the indoor unit’s printed circuit board
Take out the printed circuit board from the control box and cut off jumper wire
(J2) using wire cutters.
After cutting of the jumper wire, take measures to prevent contact with the other
the lead wires, etc.
(b) Modifying the wireless remote control
i) Remove the battery.
ii) Cut the jumper wire shown in the figure at right.
Jumper wire (J2)
Cut

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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
(6) Comfortable timer setting
If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation
is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the
relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.
(Max. 60 minutes)
Operation mode Operation start time correction value (Min.)
3 < Room temp. – Setting temp. 1 < Room temp. – Setting temp. ≤3 Room temp. – Setting temp. ≤1
At cooling +5 No change –5
3 < Setting temp. – Room temp. 2 < Setting temp. – Room temp. ≤3 Setting temp. – Room temp. ≤2
At heating +5 No change –5
Notes (1) At 5 minutes before the timer ON time, operation starts regardless of the temperature of the room temperature sensor (Th1).
(2) This function does not 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.
=
=
=
=
(7) Outline of heating operation
(a) Operation of major functional components in heating mode
(b) Air flow selection
(i) Speed of inverter changes within the range of selected air flow.
(ii) When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode.
(iii) Outdoor unit blower operates in accordance with the inverter command speed.
Item
Indoor fan motor ON ON OFF
Flaps ON or OFF ON or OFF Stop position control
Display Lights up Lights up Lights up or flashes
52C ON ON OFF after stop mode
Outdoor fan motor OFF ON OFF
4-way valve Depending on the stop mode ON Depending on the stop mode
Electronic expansion valve Depending on the EEV control
Solenoid valve OFF OFF OFF
When the inverter
speed is 0rps
When the inverter speed
is other than 0rps
When the inverter speed is 0rps
due to an anomalous stop
Functional
components
Model
SRK13ZEV-S4
Air flow selection
Inverter command speed 12~118rps
Air flow Depends on inverter command speed.
Inverter command speed 12~118rps
Air flow Depends on inverter command speed.
Inverter command speed 12~78rps
Air flow Depends on inverter command speed.
Inverter command speed 12~38rps
Air flow 4th speed fixed
Auto
HI
MED
LO

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Note (1) Refer to the table shown above right for the values A and B.
¡Normal mode (Normal heating operation, operation after HI POWER completion)
Indoor heat exchanger temp. (˚C)
¡Values of A, B
AB
At 0 rps command 22 25
Other than 0 rps 17 19
command
AB 2823 29.5 31.5 34 36 37.5 39 40
1st speed
2nd speed
3rd speed
4th speed
5th speed
6th speed
OFF
Indoor fan
(c) Details of control at each operation mode (pattern)
(i) Fuzzy operation
Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in
accordance with the fuzzy rule, and used for control of the air capacity and the inverter speed.
(ii) Heating thermostat operation
¡Operating conditions
If the speed obtained with the fuzzy calculation drops below -24 rps during the heating fuzzy operation, the operation
changes to the heating thermostat operation.
¡Detail of operation
Model
SRK13ZEV-S4
Item
Inverter speed 0rps [Comp. stopped]
Indoor fan Hot keep normal mode →1st speed
Outdoor fan Stop
Flap Horizontal
7th speed
8th speed
Note (1) Refer to the table shown above right for the values A and B.
¡Hot keep M mode [During HI POWER operation (for 15 min.)]
Indoor heat exchanger temp. (˚C)
AB2931 32 34 40 47 55
1st speed
2nd speed
3rd speed
4th speed
5th speed
6th speed
OFF
Indoor fan
(iv) Defrosting operation
1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.)
1After start of heating operation →When it elapsed 35 minutes. (Accumulated operation time)
2After end of defrosting operation →When it elapsed 35 minutes. (Accumulated compressor operation time)
3Outdoor unit heat exchanger sensor (Th4) temperature →When the temperature has been below –2ºC for 3 minutes
continuously.
4When the temperature difference between the outdoor air temperature sensor and the outdoor unit heat exchanger
sensor temperature exceeded 4.5°C
5During continuous compressor operation
In addition, when the speed command from the indoor controller of the indoor unit during heating operation has
counted 0 rps 10 times or more and all conditions of 1, 2and 3above are satisfied (note that when the temperature
for Th4 is -2°C or less: 62 rps or more, -1°C or less: less than 62 rps), defrost operation is started.
¡Values of A, B
AB
At 0 rps command 22 25
Other than 0 rps 17 19
command
7th speed
(iii) Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the temperature of
the indoor unit heat exchanger (detected with Th2, indoor unit heat exchanger sensor) to prevent blowing of cool wind.

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Indoor fan
RUN light
Corresponding
to speed
OFF
ON
Flashing
(Hot keep)
Outdoor fan
Inverter
command
Fuzzy calculated
value 70 rps
0
Corresponding
to speed
OFF
OFF
ON
(1)
4-way valve
OFF
ON
Solenoid valve
Final defrost operation
Defrost control
Hot keep
Indoor unit
Outdoor unit
120 sec.
Hot keep
100 sec.
Normal heating operation restored
Defrost end
(Th4 5˚C, 10 minutes)
Defrost operation
Defrost operation
preparation
6th speed 6th speed
>
=
Note (1) When outdoor unit heat exchanger sensor (Th4) temperature becomes 2°C or higher, inverter command changes 70 rps to 50 rps.
2) Operation of functional components during defrosting operation
3) Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
1Outdoor heat exchanger sensor (Th4) temperature: 5ºC or higher
2Continued operation time of defrosting →For more than 10 min.
(v) Heating “HI POWER” operation (HI POWER button on remote control: ON)
Operation is maintained for 15 minutes with a higher blow out air temperature.
¡Detail of operation
Model
SRK13ZEV-S4
Item
Inverter speed 118 rps
Indoor fan Hot keep M mode (max 7th speed)
Outdoor fan 6th speed
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.
(vi) Heating “JET” operation (JET button on remote control: ON)
1) Detail of operation
2) Indoor fan control
The indoor fan is controlled as shown at right in accordance with
the difference between the room temperature and setting
temperature. However, the limit after increasing the speed by 1
speed is 8 speeds.
Model
SRK13ZEV-S4
Item
Inverter speed 12~122 rps
Air flow Depends on inverter command speed
Depends on inverter
command speed
1 speed up
-3 -2
Room temp. - Setting temp. (deg)

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(8) Outline of cooling operation
(a) Operation of major functional components in cooling mode
Item
Indoor fan motor ON ON OFF
Flaps ON or OFF ON or OFF Stop position control
Display Lights up Lights up Lights up or flashes
52C ON ON OFF after stop mode
Outdoor fan motor OFF ON OFF
4-way valve Depending on the stop mode OFF Depending on the stop mode
Electronic expansion valve Depending on the EEV control
Solenoid valve OFF OFF OFF
When the inverter
speed is 0rps
When the inverter speed
is other than 0rps
When the inverter speed is 0rps
due to an anomalous stop
Functional
components
(c) Detail of control in each mode (Pattern)
(i) Fuzzy operation
During the fuzzy operation, the air flow and the inverter speed are controlled by calculating the difference between the room
temperature setting correction temperature and the suction air temperature.
(ii) Cooling thermostat operation
1) Operating conditions
During the cooling fuzzy operation or when the speed obtained by the fuzzy calculation is less than -24 rps.
2) Detail of operation
(b) Air flow selection
(i) Speed of inverter changes within the range of selected air flow.
(ii) When any protective function actuates, the operation is performed in the mode corresponding to the function.
(iii) Outdoor blower is operated in accordance with the inverter command speed.
(iii) Cooling “HI POWER” operation (HI POWER button on remote control: ON)
The unit is operated continuously for 15 minutes regardless of the setting temperature.
1) Detail of operation
Model
SRK13ZEV-S4
Item
Inverter speed 0 rps [Comp. stopped]
Indoor fan Corresponds to fan speed switch.
Outdoor fan Stop
Notes (1) Protective functions will actuate with priority even during the “HI POWER” operation.
(2) Room temperature is not adjusted during the “HI POWER” operation
Model
SRK13ZEV-S4
Item
Inverter speed 94rps
Indoor fan 7th speed
Outdoor fan 6th speed
Model
SRK13ZEVS4
Air flow selection
Inverter command speed 12~94rps
Air flow Depends on inverter command speed.
Inverter command speed 12~94rps
Air flow Depends on inverter command speed.
Inverter command speed 12~50rps
Air flow Depends on inverter command speed.
Inverter command speed 12~30rps
Air flow 2nd speed fixed.
Auto
HI
MED
LO

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(iv) Cooling “JET” operation (JET button on remote control: ON)
1) Detail of operation
2) Indoor fan control
The indoor fan is controlled as shown at right in accordance with the
difference between the room temperature and setting temperature.
However, the limit after increasing the speed by 1 speed is 8 speeds.
Model
SRK13ZEV-S4
Item
Inverter speed 12~96 rps
Air flow Depends on inverter command speed
(9) Outline of dehumidifying operation
(a) Operation start control
For 20 seconds when each type of dehumidifying starts, during judgment each hour, for 3 minutes when switching operations,
when the indoor fan is at 4th speed, the outdoor fan is at 3rd speed dehumidifying operates and the indoor and outdoor temperatures
are detected. However, during operation, (except when the On timer is in the wait state) each type of dehumidifying operation
starts immediately.
(b) Dehumidifying operation
After implementing operation start control, the operation content is determined in accordance with room temperature and the set
temperature.
If one hour passes following the decision on the dehumidifying operation mode, and after operation start control, the decision is
made for another dehumidification cooling operation, a heating oriented dehumidifying operation or a reheat dehumidifying.
(i) Cooling oriented dehumidifying operation
1) Detail of operation
Note (1) When a JET operation signal is received from the remote control, the indoor unit’s fan speed is increased by 1 speed.
Model
SRK13ZEV-S4
Item
Inverter speed 60 rps
Indoor fan motor 4th speed
Outdoor fan motor 5th speed
4-way valve OFF
Solenoid valve OFF
2) Operation change conditions
After 3 minutes have passed since the start of a cooling oriented dehumidifying operation, when the room setting temperature
becomes less than 0 degree, the dehumidifying operation changes to reheat dehumidifying.
(ii) Reheat dehumidifying
1) Operation range
The operation range is determined in accordance with the room temperature, setting temperature and humidity.
Temperature range
Humidity range Irange II range III range
a range Arange Arange Brange
b range Arange Brange Crange
c range Brange Brange Crange
Depends on inverter
command speed
1 speed up
23
Room temp. - Setting temp. (deg)
Low -3 +3 High
Cooling oriented
dehumidifying
Heating oriented
dehumidifying Reheat dehumidifying
Room temp. _Setting temp. (deg)
c Range
b Range
a Range
45 50 55
Humidity (%)
III Range
II Range
IRange
-2 +10-1
Room Temp. – Setting Temp. (deg)

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2) Detail of operation
Notes (1) If the operation range switches from a range other than the Arange to the Arange, the command speed is set at 10 rps for 10 seconds.
(2) The indoor unit’s fan speed does not change even if JET operation signals are received from the remote control.
3) Operation change conditions
a) After 12 minutes of a reheat dehumidifying operation have passed, if the room temperature < setting temperature -5
(during gentle dry is -10), after the stop mode is implemented, the operation change to a heating oriented dehumidifying
operation.
b) After 12 minutes of a reheat dehumidifying operation have passed, if the room temperature > setting temperature +5,
after the stop mode is implemented, the operation changes to a cooling oriented dehumidifying operation.
4) Reheat dehumidifying outdoor unit fan control
The outdoor unit’s fan speed is controlled as shown below in accordance with the outdoor temperature.
5) Reheat dehumidifying frost prevention control
a) Operating conditions
After 10 minutes have passed since a speed command other than 0 rps has been output, when either of the following
conditions is satisfied.
1Indoor unit heat exchanger temperature <
=2ºC or lower continuously for 30 minutes
2Indoor unit heat exchanger temperature <
=-1ºC
b) Detail of operation
1Command speed: 0 rps
2Indoor unit fan: 3rd speed
3Outdoor unit fan: Stopped
c) Reset conditions
Indoor unit heat exchanger temperature: 4ºC or higher.
30 30
A
Range
3rd speed
1st speed
ON
OFF
Outdoor fan motor
Solenoid valve
Indoor fan motor
Inverter speed
12 minutes 12 minutes
Reheat
dehumidifying
control
Reheat
dehumidifying
control
+ 1 speed up
12 minutes
Temperature and humidity check
Reheat dehumidifying
operation range decision
0
OFF
B
Range
C
Range
2nd speed
1st speed
Stop
10 22 248
Outdoor temperature (°C)

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(iii) Heating oriented dehumidifying
1) Detail of operation
2) Operation change conditions
After 3 minutes have passed since the start of heating oriented dehumidifying, if the room temperature > setting
temperature -1 and the discharge pipe temperature is 50ºC or higher, the stop mode is implemented, then cooling cycle
operation begins and changes to the reheat dehumidifying operation.
3) Cooling cycle operation control
a) Detail of operation
Notes (1) When a JET operation signal is received from the remote control, the indoor unit fan’s speed is raised 1 speed.
b) Reset conditions
When 6 minutes have passed and the outdoor heat exchanger temperature is >
=9ºC. However, the maximum operating
time is 9 minutes regardless of the outdoor heat exchanger temperature.
(c) Gentle dry operation control
(i) After the operation start control in item (a) is performed, the setting temperature is determined in accordance with the room
temperature.
Setting temperature = Room temperature
However, if the setting temperature becomes >
=28ºC, the setting temperature upper limit is set at 28ºC. The setting humidity is 55%.
(ii) Determining the operation content
1Outdoor temperature < 20ºC: Heating oriented dehumidifying regardless of the setting temperature.
2Outdoor temperature >
=20ºC:
If the room temperature < setting temperature + 3ºC, operation is in the reheat dehumidifying mode.
If the room temperature >
=setting temperature + 3ºC, operation is in the cooling oriented dehumidifying mode.
For the dehumidifying operation, see the dehumidifying operation for item (b).
(d) Laundry dry operation control
(i) After the operation start control in item (a) is performed, the setting temperature is determined in accordance with the room
temperature and outdoor temperature.
Setting temperature = Room temperature + 6ºC or the room temperature, whichever is lower.
However, if the setting temperature is <
=20ºC the bottom limit of the setting temperature is 20ºC.
If the setting temperature becomes >
=25ºC, the setting temperature upper limit is set at 25ºC. The setting humidity is 40%.
(ii) Determining the operation content
1Outdoor temperature < 20ºC: Heating oriented dehumidifying regardless of the setting temperature.
2Outdoor temperature >
=20ºC: If the room temperature < setting temperature - 3ºC, operation is in the heating oriented
dehumidifying mode.
If the setting temperature – 3ºC <
=room temperature < setting temperature + 3ºC, operation
is in the reheat dehumidifying mode.
If the room temperature >
=setting temperature +3°C, operation is in the cooling oriented
dehumidifying mode.
For the dehumidifying operation, see the dehumidifying operation for item (b).
(iii) Stop conditions
1After 3 hours pass.
2After 1 hour has passed, when it is judged 4 times to continue reheat dehumidifying in the Arange, and it doesn’t occur
the 4th time.
Model
SRK13ZEV-S4
Item
Inverter command speed 80 rps
Indoor unit fan 4th speed
Outdoor unit fan 5th speed
4-way valve ON
Solenoid valve OFF
Model
SRK13ZEV-S4
Item
Inverter speed 30 rps
Indoor fan motor OFF
Outdoor fan motor OFF
4-way valve OFF
Solenoid valve OFF

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(e) Low temperature dehumidifying protective control (Cooling oriented dehumidifying or reheat dehumidifying)
(i) Operating condition: When the room temperature or outdoor temperature becomes lower than 4ºC.
(ii) Detail of operation
(iii) Reset condition: After 7 minutes have passed.
Model
SRK13ZEV-S4
Item
Inverter speed 0 rps
Indoor fan motor 2nd speed
Outdoor fan motor Stop mode
4-way valve Stop mode
Solenoid valve Stop mode
(10) Outline of automatic operation
(a) Determination of operation mode
The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20
seconds, determines the operation mode and the room temperature setting correction value, and then begins in the automatic
operation.
Heating
Dehumidifying
Cooling
Room temperature (˚C)
Outdoor temperature (˚C)
27.5
25.5
19.5
18 30
(b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous
operation mode, changes the operation mode.
(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is selected
during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals of
the wireless remote control and the setting temperature.
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6
Setting Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30
temperature Dehumidifying 19 20 21 22 23 24 25 26 27 28 29 30 31
Heating 20 21 22 23 24 25 26 27 28 29 30 31 32
(11) Outline of fan operation
(a) Operation of major functional components
Inverter command speed
Indoor fan motor
Outdoor fan motor
Flap
Speed 6 Speed 5
0rps
OFF
Depend on the flap control
Speed 3 Speed 2
AUTO HI MED LO
Functional
components
Fan speed switching