Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 7

(g) Hot keep
Hot keep control is performed at the start of the defrost control.
1) Control
a) When the indoor heat exchanger temperature (detected with Th
indoor fan is changed to the lower tap at each setting.
b) During the hot keep, the louver horizontal control signal is transmitted.
2) Ending condition
When the indoor fan is at the lower tap at each setting, it returns to the set airflow volume as the indoor heat exchanger
temperature rises to 45°C or higher.
(h) Fan control during the heating thermostat OFF
When the heating thermostat is turned OFF, the setting of the fan control is selectable using the indoor function of wired remote
controller [ FAN CONTROL].
1) Low fan speed (Factory default)
If the indoor heat exchanger temperature drops below 35°C with the heating thermostat OFF, the indoor fan operate at the
lower speed tap at each setting.
2) Set fan speed
Even if the indoor heat exchanger temperature drops below 35°C with the heating thermostat OFF, the indoor fan
continues to run at the set airflow volume.
3) Intermittence
If the indoor heat exchanger temperature drops below 35°C with the heating thermostat OFF, the indoor fan operates at
the lower speed tap at each setting and, when the indoor heater exchanger temperature drops below 25°C, the indoor fan
stops for 5 minutes. Then the fan runs at the low speed tap for 2 minutes, and the judgment is made by the thermostat.
4) Fan OFF
If the indoor heat exchanger temperature drops below 35°C with the heating thermostat OFF, the indoor fan is turned
OFF. The same applies also when the remote controller sensor is effective.
(i) Filter sign
As the operation time (Total ON time of ON/OFF switch) accumulates to 180 hours (1), "FILTER CLEANING" is displayed
on the remote controller. (This is displayed when the unit is in trouble and under the centralized control, regardless of ON/OFF)
Note (1) Time setting for the filter sign can be made as shown below using the indoor function of wired remote controller "FILTER SIGN SET". (It is set at 1 at the
shipping from factory.)
Filter ign etting
TYPE 1
TYPE 2
TYPE 3
TYPE 4
(2) After the setting time has elapsed, the "FILTER CLEANING" is displayed and, after operating for 24 hours further (counted also during the stop), the
unit stops.
(j) Auto swing control [Applicable model: FDT and FDEN]
1) Louver control
a) Press the "LOUVER" button to operate the swing louver when the air conditioner is operating.
"SWING
b) To fix the swing louver at a position, press one time the "LOUVER" button while the swing louver is moving so that
four stop positions are displayed one after another per second.
When a desired stop position is displayed, press the "LOUVER" button again. The display stops, changes to show
the "STOP 1
c) Louver operation at the power on with a unit having the louver 4-position control function
The louver swings one time automatically (without operating the remote controller) at the power on.
This allows inputting the louver motor (LM) position, which is necessary for the microcomputer to recognize the
louver position.
Note (1) If you press the "LOUVER" button, the swing motion is displayed on the louver position LCD for 10 second. The display changes to the
"SWING
Setting time: 180 hrs (Factory default)
Setting time: 600 hrs
Setting time: 1,000 hrs
Setting time: 1,000 hrs (Unit stop)
" is displayed for 3 seconds and then the swing louver moves up and down continuously.
" for 5 seconds and then the swing louver stops.
" display 3 seconds later.
-R1 or R2) drops to 35°C or lower, the speed of
I
Function
(2)
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