-
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
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