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FDTN-H
13) Compressor inching prevention control (FDC208, 258 or 6 series only)
a)
Compressor 3 minutes delay control
The compressor will remain in stop state for three minutes. When the compressor is stopped by thermostat, ON/OFF switch,
and/or by occurrence of trouble. When the power source is turned ON, the three-minute delay timer is cancelled.
b)
Compressor 3 minutes forced operation control
Compressor cannot be stopped for 3 minutes after it started. However, it will be stopped immediately when the thermostat is
turned off due to the operation stop initiated by the ON/OFF switch or the change of operation mode.
Note (1) Both the error control and the protective control take priority over this control.
14) Overload protection during heating (Only heat pump type)
If an overload condition has been detected by the indoor heat exchanger temperature and it has continued for more than 2 seconds
during heating, the compressor is stopped. The compressor is started after a delay of 3 minutes and, if the overload condition is
detected again whithin 60 minutes after the initial detection, the compressor is stopped with the error stop.
15) Automatic restart control
If there is interruption of power while the unit is operating, the unit operates after power restoration under the same condition as prior to
the power interruption. However the compressor will only be able to start three minutes after the power restoration. Furthermore, if the
timer was operating prior to the power interruption, the unit remains stopped even after the restoration of service.
Note (1) Becomes invalid if the dip switch SW3-1 on the indoor PC board is at OFF (SW3-1 is set at ON when unit is shipped
from the factory).
16) Thermistor disconnection detection control
a)
Detection of indoor return air thermistor disconnection
● If there is detection of a disconnection on the return air thermistor in 10 seconds after turning the power ON, the compressor
is stopped. If there is a second disconnection on the return air thermistor detected within 60 minutes, there is emergency
stop.
Note (1) If the first disconnection on the return air thermistor is detected for a period of 6 continuous minutes, there is emergency
stop. If there is no detection of a second disconnection on the return air thermistor whithin 60 minutes, the first detection
becomes invalid.
b)
Detection of heat exchanger thermistor disconnection
● If a disconnection is detected on the heat exchanger thermistor in 20 seconds after the compressor has been operating for
2 minutes, the compressor is stopped. If a second disconnection on the heat exchanger thermistor line is detected within
60 minutes, there is emergency stop.
Note (1) If the first disconnection on the heat exchanger thermistor is detected for a period 6 continuous minutes, there is emergency
stop.
If there is no detection of second disconnection on the heat exchanger thermistor within 60 minutes, the first detection
becomes invalid.
248
Heating operation
61
Indoor heat exchanger
temperature(˚C)
68
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