Master Control; Operation Mode Control - Fujitsu AB12 Service Manual

6-3 MASTER CONTROL

6-3-1 OPERATION MODE CONTROL

Each operation mode is controlled as below.
(1) Stop motion
Indoor fan motor
RB unit discharge valve : OFF
RB unit suction valve
RB unit by-pass valve
Electric expansion valve
Drain pump
(2) Cool, Fan, Heat and Dry Mode
Indoor fan motor
Operates according to
the AIR FLOW-
MODE setting.
(Except Monitoring)
RB unit
discharge valve
RB unit
suction valve
RB unit
by-pass valve
Drain pump
Electrical
Pulse controlled by
expansion valve
the temperature
compensation and
the de-icing function
6-3-2 "AUTO"(AUTO CHANOVER) POSITION
If the autochangeover is selected,the following control is performed.
AUTO CHANGEOVER operation (HEAT RECOVERY TYPE )
"Automatic Operation"
Signal reception
"Shunt controller" :
Suction valve OFF
Bypass valve ON
"Electronic expansion Valve" :
40 pulses
"Indoor fan motor" : S-L
Demand capacity signal
transmission
"Mask" means "Timer time-up ".
: OFF
: OFF
: OFF
: Stop pulse
: Turns ON-OFF by the drain pump control function
Cool Fan
Operates according
to the AIR
FLOW-MODE
setting.
OFF OFF
ON OFF
OFF OFF
Turns ON-OFF by the drain pump control function
Stop pulse
"Cool" or "Dry"
"Automatic Operation"
"Shunt controller" :
Discharge valve OFF
Demand capacity signal
transmission
NO
O
"Shunt controller" :
"Electronic expansion Valve" :
40 pulses
"Indoor fan motor" : S-L
Note1
Note2
a
YES
Heating operation
YES
Cooling operation
Heat
Operates according to the
AIR FLOW-MODE
setting besides followings.
Cold air prevention
Defrost operation
Monitoring
ON
OFF
ON
Pulse controlled by the
temperature
compensation and the
defrosting function
"Heat"
Signal reception
50 sec Mask
Bypass valve ON
O
Monitoring 1
= < Ts–2
T
R
Note3
NO
= > Ts+2
T
R
Note3
NO
– 65 –
Dry
See the fan control
page.
OFF
Heat recovery type
ON
Only
OFF
Pulse controlled
by the temperature
compensation
and the de-icing
function
"Fan" or "Start"
"Automatic Operation"
Signal reception
Indoor Fan Motor : S-L
O
Monitoring 2
Remarks