-
19
-
4.9 Outline of automatic operation
(1)
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
(2)
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.
(3)
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.
(4)
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.
Signals of wireless remote controller (Display)
–6
–5
–4
–3
–2
–1
±
0
+1
+2
+3
+4
+5
+6
Setting
Cooling
19
20
21
22
23
24
25
26
27
28
29
30
31
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
4.10 Economical operation
(ECONO button on remote controller: ON)
(1)
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.
(2)
Detail of operation
4.11 Protective control function
(1)
Frost prevention for indoor heat exchanger
(During cooling or dehumidifying)
(a)
Operating conditions
(i)
Indoor heat exchanger temperature (detected with Th2) is lower than 5ºC.
(ii)
10 minutes after reaching the inverter command speed except 0 rps.
(b)
Detail of anti-frost operation
5
°
C or lower
2.5
°
C or lower
Item
Indoor command speed
20 rps (Type 50: 15 rps)
0rps
Indoor fan
Depends on operation mode
25·35ZD: Max 2nd
50ZD: Max 3rd
Outdoor fan
Depends on operation mode
OFF
4-way valve
OFF
Depends on stop mode
(c)
Reset conditions:
20 rps (Type 50: 15 rps) After 5 minutes of operation,
the indoor heat exchanger temperature (Th2) is 8ºC or higher.
Model
SRK25ZD-S
SRK35ZD-S
SRK50ZD-S
Item
Operation mode
Cooling
Heating
Cooling
Heating
Cooling
Heating
Inverter command speed
20~52rps
30~72rps
20~58rps
30~76rps
15~60rps
15~62rps
Indoor fan
2nd, 5th speed
4th, 6th speed
2nd, 5th speed
4th, 6th speed
3rd~5th speed
4th, 5th speed
Outdoor fan
3rd speed
1st speed
Indoor heat exchanger
temperature
Indoor heat exchanger
temperature (
°
C)
2.5
5
8
0 rps
20 rps
(Type 50: 15rps)
Inverter
command
speed