Service Manual

– 62 –
+1.5
Tsc
or Tsh
-1.5
Ta
(˚C)
COOL
(COOL ON)
(COOL OFF)
HEAT
8-2. Control Specifications
No.
1
2
Item
When power
supply is reset
Operation mode
selection
Outline of specifications
1) Distinction of outdoor units
When the power supply is reset, the outdoors are
distinguished, and control is exchanged according to
the distinguished result.
2) Setting of speed of the indoor fan/setting whether to
adjust air direction or not.
(Only 4-way models)
Based on EEPROM data, speed of the indoor fan or
setting whether to adjust air direction or not is
selected.
1) Based on the operation mode selecting command
from the remote controller, the operation mode is
selected.
Remote controller
command
STOP
FAN
COOL
DRY
HEAT
AUTO
Outline of control
Air conditioner stops.
Fan operation
Cooling operation
Dry operation
Heating operation
• COOL/HEAT operation mode is
automatically selected by Ta
and Ts for operation.
1) Judge the selection of COOL/HEAT mode as shown
in the figure above.
When 10 minutes passed after thermostat had been
turned off, the heating operation (Thermo OFF) is
exchanged to cooling operation if Tsh exceeds +1.5
or more.
(COOL OFF) and (COOL ON) in the figure indicate
an example.
When 10 minutes passed after thermostat had been
turned off, the cooling operation (Thermo OFF) is
exchanged to heating operation if Tsc exceeds –1.5
or less.
2) For the automatic capacity control after judgment of
COOL/HEAT, refer to item 4.
3) For the temperature correction of room temperature
control in automatic heating operation, refer to item 3.
Remarks
Air speed/
Air direction adjustment
Ta : Room temperature
Ts : Setup temperature
Tsc : Setup temperature in
cooling operation
Tsh : Setup temperature
+ Room temperature
control temperature
compensation