Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 8

(14) Anomalous fan motor (FDT and FDK only)
Fan motor will be stopped with displaying "E16", if it has detected the revolutions of 200 rpm or less continuously for 30
seconds at a rate of 4 times within 60 minutes, after starting the motor.
(15) High ceiling control [Applicable type: FDT, FDTC, FDTW, FDTS and FDE]
When the indoor unit is installed at a high ceiling, the airflow volume mode control can be changed with the indoor function of
wired remote controller "High ceiling setting".
Setting
Remote controller setting
Fan speed
Note (1) It is set at Standard at the shipping from factory.
(2) At the hot start, heating thermostat OFF, or other, the indoor fan operate at the slow speed tap at each setting.
(16) Hot start
Indoor fan motor control is performed at the start of heating operation.
(a) When the temperature detected with the indoor heat exchanger thermistor (Th
control the fan with AC motor: Lo and DC motor: ULo.
(b) When the heat exchanger thermistor detects 45°C or higher with the fan running at Lo/ULo, it returns to the set airflow
volume.
(c) On the indoor unit of which the thermostat has been turned OFF during heating operation, the fan is turned OFF if the
heat exchanger thermistor temperature (Thi-R1 or Thi-R2) drops 25°C or lower.
(17) Detection room temperature compensation during heating
With the standard specification, the compressor is turned ON/OFF based on the setting temperature of thermostat. However,
when the thermostat OFF is likely to occur earlier because the unit is installed in a condition that warm air tends to accumulate
near the ceiling, the setting can be changed by using the indoor function of wired remote controller "Heating room temperature
compensation". Since the compressor is turned ON/OF at one of the setting temperature at +3, +2 or +1°C, the feeling of
heating can be improved. However, the upper limit of setting temperature is 30°C.
Standard
Compressor
Setting temperature
(18) Return air temperature compensation
This is the function to compensate a difference between the detected temperature of the Return air thermistor and the measured
temperature after installation of unit.
(a) It is adjustable in the unit of 0.5°C by using the indoor function of wired remote controller "Return air thermistor
compensation".
• +1.0°C, +1.5°C and +2.0°C
(b) Since the compensated temperature is transmitted to the remote controller and the outdoor unit, it is controlled with the
compensated temperature.
Note (1) Compensation of detection temperature is effective for the indoor unit sensor only.
(19) External control (Remote display)/Remote operation
Always connect the wired remote controller. Otherwise, you cannot perform the remote operation.
(a) Output for external control (remote display) (Optional remote RUN/STOP monitor kit can be utilized.)
Following output connectors (CNT) are provided on the indoor control PCB. Connect the remote RUN/STOP monitor kit
and pick up respective dry contact signal.
• Operation output: Outputs DC12V relay drive signal during operation.
Standard (Shipping)
Hi Me Lo
Hi Me Lo
Lo/ULo
Heat exchanger thermistor temp. (Th
Operation
Stop
–1
+1
Room temp. (deg)
High Ceiling 1
Hi Me Lo
UHi1 Hi Me
Set airflow volume
35°C 45°C
-R1 or R2)
I
With setting at +3°C
• −1.0°C, −1.5°C and −2.0°C
6
– –
High Ceiling 2
Hi Me Lo
UHi2 Hi Me
-R1 or Th -R2) drops 35°C or lower, it
I I
Operation
Compressor
+2
Setting temperature
Room temp. (deg)
Stop
+4