Room Temperature Sensing Temperature Compensation During Heating; Filter Sign; Auto Swing Control (Except The Fdur Model); Auto Louver Horizontal Set During Heating - Mitsubishi Heavy Industries FDCA Series Technical Manual

(h) Room temperature sensing temperature compensation during heating
In the standard specifications, the temperature set on the thermostat is used to turn the compressor on and off, but in cases
where the warm air easily escapes to the ceiling and the thermostat ends up turning off too soon, Jumper wire J4 (SW7-4) on
the indoor PCB can be disconnected. When this is done, the compressor can be turned ON and OFF at the set temperature +3
degrees, and the feeling that the room is heated can be improved. However, the upper limit for the set temperature is 30ºC.
Standard
Compressor
Set temperature
Room temperature (deg)
(i)

Filter sign

If operating time (the length of time the ON/OFF switch is ON) totals 180 hours
the remote control unit. (This is displayed whether the system is running or not, when the unit is broken down, and when
there is central control.)
Notes (1) The following controls are enabled by the combination of the ON/OFF settings of 2 switches on the indoor unit PCB, SW5-3 and SW5-4.
(They are switched OFF when the unit is shipped from the factory. The setting time is 180 hours.)
Switch
SW5-3 OFF
SW5-4 OFF
SW5-3 OFF
SW5-4 ON
SW5-3 ON
SW5-4 OFF
SW5-3 ON
SW5-4 ON
Notes (2) The message "FILTER CLEANING" is displayed after the setting time has passed, then the unit stops after another 24 hours have passed
(including stop time).
(j)

Auto swing control (Except the FDUR model)

1) Louver Control
a) While the air conditioner is operating, press the "LOUVER" switch.
"AUTO
b) When fixing the position of the swing louvers, press the "LOUVER" switch once while the swing louvers are moving. 4
stop positions are displayed in sequence at 1-second intervals.
When the display comes to the position where you would like to stop the louvers, press the "LOUVER" switch once
more. The display will stop the message (ex. "STOP 1
stop.
c) Louver operation when the louver 4-position controller's power goes On
When the power is turned ON, the louvers automatically swing 1 time automatically (without remote control operation).
This is done so that the microcomputer can confirm the louver's position and input the louver motor's (LM) position to
the microcomputer.
Note (1) When the "LOUVER" switch is turned ON, the louver position LCD display displays the swing operation for 10 seconds.
Then "AUTO

2) Auto louver horizontal set during heating

During display of "
horizontal position regardless of the operation of the auto swing switch (auto swing and louver stop). (In order to prevent
cold drafts.) Also, the louver position display LCD continues the previous display from before this control started.
If the " " (Heating Preparation) display goes off, the LCD display also returns to the original display.
3) Louver free stop control
Setting an open circuit with jumper wire J5 (SW8-1), used for setting louver free stop, causes the louver motor to stop if
there is a stop signal from the remote control unit and saves the position of the louver in memory. Then if there is an auto
swing signal from the remote control unit, auto swing control starts from the previous stop position.
Operation
If J4 (SW7-4) is disconnected
(if it is turned ON),
Stop
— 1
+ 1
Function
Setting time: 180 hrs. (when shipped from factory)
Setting time: 600 hrs. (Display)
Setting time: 1000 hrs. (Display)
Setting time: 1000 hrs. (Unit stop)
" is displayed for 3 seconds and the swing louvers move up and down continuously.
" is displayed for 3 seconds.
" (Heating Preparation) (during hot start and heating thermostat OFF), the louvers are in the
Compressor
Set temperature
(2)
") will be displayed for 3 seconds, then the swing louvers will
71
- -
Operation
+2 + 4
Room temperature (deg)
(1)
, "FILTER CLEANING" is displayed on
Stop