Mitsubishi Electric FDF100VSXVD Technical Manual page 94

a) When the indoor unit suction air temperature (detected with ThI-A) is higher than 23°C and the indoor heat
exchanger sensors (ThI-R1, -R2) detect the frequency drop start temperature A°C + 1.0°C, the indoor fan speed
is increased by 20 rps.
• Frequency drop start temperature (A) – Low: 1.0°C (Factory default)
• Frequency drop start temperature (A) – High: 2.5°C
b) When the indoor unit suction air temperature (detected with ThI-A) is higher than 23°C and the forced
compressor OFF control by the frost protection control is operating, the indoor fan speed is increased by 1 tap.
c) When, after increasing the indoor fan speed by the frost protection control, the indoor unit suction air temperature
is higher than 23°C and the indoor heat exchanger sensors detect the frequency drop start temperature A°C + 1.0°C,
the indoor fan speed is increased by 20 rps.
d) If the condition of b) above is detected again after increasing the indoor fan speed by the frost protection control,
the indoor fan speed is raised by 1 tap.
e) Valid or invalid of fan control can be selected with the frost protection control of the wired remote controller
indoor function.
(l) Heating overload protection
(1) If the indoor heat exchanger temperature (detected with ThI-R2, -R2) at 63°C or higher is detected for 2
seconds, the heating overload protection control starts and is released if temperatures at 56°C or lower
are detected.
Heating overload protection control
Release
Indoor heat exchanger temperature (℃)
(2) First detection of heating overload
1) Compressor OFF signal is sent and the OFF control starts.
2) Compressor is turned ON if the thermostat is turned ON, and if the return air temperature (detected with ThI-A) at 31
°C or higher is detected for 2 seconds, the compressor s turned OFF forcibly.
(3) At second, third or fourth detection after detecting the heating overload
1) Compressor OFF signal is sent and the OFF control starts.
2) Compressor is turned ON if the thermostat is turned ON, and if the indoor fan speed is set at Me or Lo tap, the speed is
increased by 1 tap.
(4) If fifth detection occurs within 60 minutes after the first and it is detected for 6 minutes continuously, the
compressor stops with the anomalous stop (E8).
Start
56 63
Temperature drop
Temperature rise
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