'18 • SRK-SM-259
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7
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(10) Outline of cooling operation
(a) Operation of major functional components in cooling mode
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
During the fuzzy operation, the air ow and the compressor speed are controlled by calculating the difference between
the room temperature setting correction temperature and the suction air temperature.
ON OFF OFF
OFF OFF OFF
ON
OFF
(few minutes ON)
OFF
(few minutes ON)
ON ON ON
Thermostat ON Thermostat OFF Failure
Cooling
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
15-74rps 20-97rps
15-74rps
15-98rps
15-98rps 20-97rps
15-52rps 15-74rps 20-72rps
15-38rps 15-46rps 20-44rps
Model
Fan speed
SRK25ZSP-W SRK35ZSP-W SRK45ZSP-W
AUTO
MED
HI
LO
(11) Outline of automatic operation
(a) Determination of operation mode
The unit checks the indoor air temperature and the outdoor air temperature, determines the operation mode, and then
begins in the automatic operation.
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
(b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the pre-
vious operation mode, changes the operation mode.
(i) If the setting temperature is changed with the remote control, the operation mode is judged immediately.
(ii) When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending
on the difference between the setting temperature and the indoor air temperature.
(iii) When the operation mode has been judged following the change of setting temperature with the remote control, the hour-
ly judgment of operation mode is cancelled.
(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.
(e) When the unit is operated automatically with the wired remote control connected, the cooling operation is controlled ac-
cording to the display temperatures while the setting temperature is compensated by
＋
1˚C during dehumidifying or by
＋
2˚C during heating.
A
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1
±
0 +1 +2 +3 +4 +5 +6
Setting
temperature
Cooling
18 19 20 21 22 23 24 25 26 27 28 29 30
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
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