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INDOOR UNIT CONTROL CIRCUIT (Continued)
7-2. Control Specifications
NO.
1
2
3
Item
Control at
power-on reset
Operation mode
switching
Room temperature
control
Overview of specifications
(1) Identification of outdoor unit
Identifies outdoor unit at power-on reset, and switches control
according to the identification result.
(2)
Setting of indoor unit fan speed and adjustment of air flow direction
Switches indoor unit fan speed, setting of air flow direction
adjustment, etc. based on EEPROM data.
(1) Switches operation mode according to mode select instruction
from remote controller.
(2) Operation instruction permission mode
HEAT and AUTO modes are not available for COOL only models.
When instruction is issued from wireless remote controller in the
HEAT or AUTO mode, it is indicated by a reception sound “pi, pi”
and by alternate blinking of “TIMER” and “PREPARING” lamps. To
cancel this alternate blinking, issue an instruction of mode other
than HEAT or AUTO.
(1) Adjustment range Remote controller set temperature (°C)
* When use of remote controller sensor is set (with DN32), even
when sensor value is within the above range in HEAT or AUTO
mode, the thermo sensor turns OFF when Ta sensor value
exceeds 35 °C.
Remarks
The “PREPARING” lamp
lights during initial setting
(model recognition) after
power-on reset.
Fan speed, adjustment of
air flow direction
R/C instructions
OFF
FAN
COOL
DRY
HEAT
AUTO
Outline of control
Turns OFF air conditioner
“Fan only” operation
Cooling operation
Dehumidifying operation
Heating operation
• Selects COOL or HEAT mode
automatically according to Ta, Ts, and To.
• The first operation is as follows according
to Ta. (COOL thermo sensor continues
OFF (FAN mode with set fan speed) within
the range of Ts +α-1<Ta< Ts +α+1.)
• α is corrected according to outside air
temperature.
Outside air temp. Corrected value (α)
No To 0 K
To
=
>
24°C -1 K
24>To
=
>
18°C 0 K
To<18°C +1 K
Abnormal To 0 K
COOL/DRY HEAT AUTO
Wired type 18 - 29 18 - 29 18 - 29
Wireless type 17 - 30 17 - 30 17 - 30
Ta : Room temperature
Ts : Set temperature
To : Outside air temperature
k=deg
+1.0
Ts+
-1.0
Ta
( )
COOL
operation
FAN mode with
set fan speed
HEAT
operation
– 17 –