Fujitsu AirStage AB12, Service Manual

Page: 65 / 199

(2) Cool, Fan, Heat and Dry Mode
Indoor fan motor
Operates according to
the AIR FLOW-
MODE setting.
(Except Monitoring)
Operates according
to the AIR
FLOW-MODE
setting.
Operates according to the
AIR FLOW-MODE
setting besides followings.
Cold air prevention
Defrost operation
Monitoring
See the fan control
page.
Cool Fan Heat Dry
RB unit
discharge valve
RB unit
suction valve
RB unit
by-pass valve
Drain pump Turns ON-OFF by the drain pump control function
Electrical
expansion valve
Pulse controlled by
the temperature
compensation and
the de-icing function
Stop pulse Pulse controlled by the
temperature
compensation and the
defrosting function
Pulse controlled
by the temperature
compensation
and the de-icing
function
OFF
OFF
OFF
OFF OFF
OFF
OFF
ON
OFF
ON
ON
Each operation mode is controlled as below.
(1) Stop motion
Indoor fan motor : OFF
RB unit discharge valve : OFF
RB unit suction valve
: OFF
RB unit by-pass valve : OFF
Electric expansion valve
Drain pump : Stop pulse
: Turns ON-OFF by the drain pump control function
6-3-1 OPERATION MODE CONTROL
6-3 MASTER CONTROL
ON
Heat recovery type
6-3-2 "AUTO"(AUTO CHANOVER) POSITION
"Cool" or "Dry"
"Heat" "Fan" or "Start"
"Automatic Operation"
Signal reception
"Shunt controller" :
Suction valve OFF
Bypass valve ON
"Electronic expansion Valve" :
40 pulses
"Indoor fan motor" : S-L
O
Demand capacity signal
transmission
"Shunt controller" :
Discharge valve OFF
Demand capacity signal
transmission
NO
50 sec Mask
"Shunt controller" :
Bypass valve ON
"Electronic expansion Valve" :
40 pulses
"Indoor fan motor" : S-L
O
Indoor Fan Motor : S-L
O
Monitoring 1
T
R
=
<Ts–2
T
R
=
>Ts+2
Note2
Heating operation
Cooling operation
NO
NO
YES
YES
Note3
Note3
Note1
AUTO CHANGEOVER operation (HEAT RECOVERY TYPE )
a
"Automatic Operation"
Signal reception "Automatic Operation"
Signal reception
Monitoring 2
"Mask" means "Timer time-up ".
Remarks
Only
If the autochangeover is selected,the following control is performed.
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