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(9) 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.
Room 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 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 controller and the setting temperature.
Cooling
Setting
Dehumidifying
temperature
Heating
(10) Economical operation
(a) The set temperature is raised by 1.5ºC (0.5ºC every one hour) at cooling operation and lowered by 2.5ºC (Steps of 1ºC, 1ºC and
0.5ºC every one hour) at heating operation to continue the operation with the following contents.
(b) Detail of operation
Model
Item
Operation mode
Inverter command speed
Indoor fan
Outdoor fan
(11) Protective control function
(a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying)
(i)
Operating conditions
1)
Indoor heat exchanger temperature (detected with Th2) is lower than 5ºC.
2)
10 minutes after reaching the inverter command speed except 0 rps.
(ii) Detail of anti-frost operation
Indoor heat exchanger
Item
Upper limit speed
Indoor fan
Outdoor fan
4-way valve
(iii) Reset conditions: The indoor heat exchanger temperature (Th2) is 8ºC or higher after 5 minutes of operation following
control of the inverter command speed upper limit.
27.5
25.5
19.5
–6
–5
–4
19
20
21
19
20
21
20
21
22
(ECONO button on remote controller: ON)
SRK20, 25ZD-S1
Cooling
Heating
20~52rps
20~72rps
2nd, 5th speed
4th, 6th speed
temperature
5°C or lower
20, 25 : 44 rps
35, 50 : 70 rps
Depends on operation mode
Depends on operation mode
OFF
Dehumidifying
Heating
18
Outdoor temperature (˚C)
Signals of wireless remote controller (Display)
±0
–3
–2
–1
22
23
24
25
22
23
24
25
23
24
25
26
SRK35ZD-S1
Cooling
20~58rps
20~76rps
2nd, 5th speed
4th, 6th speed
3rd speed
2.5°C or lower
0rps
20, 25, 35: Max 2nd
50: 2nd
OFF
Depends on stop mode
22
-
-
Cooling
30
+1
+2
+3
+4
26
27
28
29
26
27
28
29
27
28
29
30
SRK50ZD-S1
Heating
Cooling
15~60rps
3rd~5th speed
1st speed
Inverter
command
speed
Upper
limit
speed
0 rps
2.5
Indoor heat exchanger
temperature (°C)
+5
+6
30
31
30
31
31
32
Heating
15~62rps
4th, 5th speed
5
8
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