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INDOOR UNIT CONTROL CIRCUIT (CONTINUED)
7-2. Control Specifications
NO.
1
Item
Control at power-on
reset
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.
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.
No To
To
≥
24°C
24 > To
≤
18°C
To < 18°C
Abnormal To
Corrected value (
α
α
α
α
α
)
0K
–1 K
0 K
+1 K
0 K
(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.
A
Wired type
Wireless type
COOL/DRY
18 - 29
17 - 30
HERT
18 - 29
17 - 30
AUTO
18 - 29
17 - 30
• 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
(1) Switches operation mode according to mode select instruc-
tion from remote controller.
Operation mode
switching
Room temperature
control
2
3
Ta : Room temperature
Ts : Set temperature
To : Outside air temperature
(1) Adjustment range Remote controller set temperature (°C)
k = deg
Fan mode with
set fan speed
COOL
operation
HEAT
operation
Ta
(°C)
–1.0
Ts +
α
+1.0
