Mitsubishi Heavy Industries SRK20ZIX-S Service Manual page 62

(2) Auto air outlet selection
(a) COOL, DRY operation
1) In case both lower and upper outlets operation is selected in Cooling or Dry
operation, both outlets will be kept for sixty minutes after the start or until indoor
temperature is below the setting point. And then the air outlet will change to the
upper outlet. That state will be maintained until switch is turned off.
2) In case both outlets operation with Auto fan speed mode is selected, the upper
outlet will be kept for ten minutes after the start or until indoor temperature is close
to reaching the setting point . And then the air outlet will change to both outlets in
order to spread comfort air to every corner.
(b) HEAT operation
1) In case both lower and upper outlets operation with Auto fan speed mode is
selected, the lower outlet will be kept for twenty minutes after the start or until
room temperature is close to reaching the setting point . And then the air outlet will
change to both outlets. That state will be maintained until the switch is turned off.
2) Automatic adjustment of lower air outlet direction prevents stirring up of warm air
and keeps optimum comfort at floor level.
2.6.7 Timer operation
(1) Comfortable timer setting (ON timer)
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 indoor temperature at the setting time (temperature of room temperature sensor)
and the setting temperature.
(2) Sleep timer operation
Pressing the SLEEP button causes the temperature to be controlled with respect to the set temperature.
(3) OFF timer operation
The Off timer can be set at a specific time (in 10-minute units) within a 24-hour period.
2.6.8 Outline of heating operation
(1) Operation of major functional components in heating mode
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
(2) Details of control at each operation mode (pattern)
(a) Fuzzy operation
Deviation between the indoor temperature setting correction temperature and the return air temperature is calculated in
accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed.
Fan speed
Auto
HI
MED
LO
When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode.
(b) 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 heat exchanger (Th2) to prevent blowing of cool wind.
Thermostat ON
ON
ON
ON
ON
Model
SRF25ZIX-S
30~102rps
30~102rps
30~76rps
30~58rps
Heating
Thermostat OFF
OFF
ON(HOT KEEP)
OFF
(few minutes ON)
ON
(3 minutes ON)
SRF35ZIX-S SRF50ZIX-S
30~115rps 12~110rps
30~115rps 12~110rps
30~106rps 12~80rps
30~80rps 12~60rps
61
- -
Failure
OFF
OFF
OFF
OFF