AirStage AO54FJ, Service Manual

Page: 56 / 169

05-02
(2) Cool, Fan, Heat and Dry Mode
Indoor fan motor Operates according to
the AIR FLOW-MODE
setting, and besides
Operates according
to the AIR FLOW-
MODE setting.
Operates according to the
AIR FLOW-MODE setting,
and besides
Cold air prevention
Defrost operation
See the fan control
page.
Cool Fan Heat Dry
Drain pump Turns ON-OFF by the drain pump control function
Electrical
expansion valve Pulse controlled by
the temperature differ-
ence calculation and
frost prevent fuction
Stop pulse Pulse controlled by the
temperature difference
caculation and the
defrosting function
Each operation mode is controlled as below.
(1) Stop mode
Indoor fan motor : OFF
Electric expansion valve
Drain pump : Stop pulse
: Turns ON-OFF by the drain pump control function
5-2-1 Operation Mode Control
5-2 MASTER CONTROL
5-2-2 Auto Changeover
frost prevention
operation
Pulse controlled by
the temperature dif-
ference calculation
and frost prevent
function
Yes
Yes
Yes
NO
Operation flow chart
START
Room temp.
Ts+2 ?
Room temp.
Ts+1 ?
COOLING OPERATION
DRY OPERATION
Yes
NO
NO
NO
Cool
Dry
Room temp.
Ts+2 ?
Refrigerant
circulation stopped?
AUTO CHANGEOVER operation (COOLING ONLY TYPE )
T
S
:
Setting temperature
(1) When the indoor unit starts the operation
at “AUTO" or it is switched to “AUTO” from
other modes, if the room temperature is
higher than the set tempe
(Room temp. Set temp.(Ts) + ),
"COOL" operation will start automatically.
2
2
(2)
(3)
2
When the room temperature increases
up to the set temp. (Ts) + during the
"DRY" operation, the indoor unit will
switch to "COOL" operation automatically.
1
When the room temperature decreases
under the set temp. (Ts) + during the
"COOL" operation, the indoor unit will
switch to "DRY" operation automatically.
(4) When the indoor unit starts the operation
at “AUTO" or it is switched to “AUTO” from
other modes, if the room temperature is
lower than the set tempe
(Room temp. Set temp.(Ts) + ),
"DRY" operation will start automatically.
2
2
Ts+2
Ts
Ts+1
Cool
Dry
The cases of (1) and (4)
C
o
o
l
D
R
Y
The cases of (2) and (3)
Refrigerant
circulation started?
NO
Yes
(due to temp.)
(due to temp.)