Master Control; Operation Mode Control; Auto Changeover - Fujitsu Airstage V series Service Manual

5-2 MASTER CONTROL

5-2-1 Operation Mode Control

Each operation mode is controlled as below.
(1) Stop mode
Indoor fan motor
Electric expansion valve
Drain pump
(2) Cool, Fan, Dry and Heat Mode
Indoor fan motor
Drain pump
Electrical
expansion valve

5-2-2 Auto Changeover

AUTO CHANGEOVER operation (COOLING ONLY TYPE )
Operation flow chart
START
Room temp.
Ts+2
Yes
COOLING OPERATION
Yes
Room temp.
Ts+1
Yes
Room temp.
Ts+2
NO
Refrigerant
circulation stopped?
(due to temp.)
Yes
Refrigerant
NO
circulation started?
(due to temp.)
: OFF
: Stop pulse
: Turns ON-OFF by the drain pump control function
Cool
Operates according to
the AIR FLOW-MODE
setting.
Turns ON-OFF by the drain pump control function
Pulse controlled by
the temperature differ-
ence calculation and
frost prevent fuction
T Setting temperature
:
S
NO
?
DRY OPERATION
NO
?
?
NO
Yes
Fan
Operates according See the fan control
to the AIR FLOW- page.
MODE setting.
Pulse controlled by
Stop pulse
the temperature dif-
ference calculation
and frost prevent
function
(1) When the indoor unit starts the operation
(2)
(3)
(4) When the indoor unit starts the operation
The cases of (1) and (4)
05-02
Dry HEAT
Operates according to
the AIR FLOW-MODE
setting, and besides
cold air prevention
operation
Pulse controlled by
the temperature dif-
ference.
at "AUTO" or it is switched to "AUTO" from
other modes, if the room temperature is
higher than the set temperature +
(Room temp. Set temp.(Ts) +
"COOL" operation will start automatically.
When the room temperature decreases
under the set temp. (Ts) +
"COOL" operation, the indoor unit will
switch to "DRY" operation automatically.
When the room temperature increases
up to the set temp. (Ts) +
2
"DRY" operation, the indoor unit will
switch to "COOL" operation automatically.
at "AUTO" or it is switched to "AUTO" from
other modes, if the room temperature is
lower than the set temperature +
(Room temp. Set temp.(Ts) +
"DRY" operation will start automatically.
The cases of (2) and (3)
Cool
Ts+2
Dry Ts+1
Ts
2
2 ),
during the
1
during the
2
),
2
Cool
Dry