Specifications

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45
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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 ther-
mistor 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.
15) Drain detection
a) If there is detection of a drain abnormality during cooling operation, the drain pump goes ON for 5 minutes and
the compressor which had been running comes to a stop.
Overflow detection is carried out at all times with the float switch regardless of operational mode. If an overflow
is generated (or if the float switch is not yet connected or has been disconnected). there is emergency stop (E9 is
displayed) the drain motor operates until reset of the float switch.
b) If a drain abnormality is detected during cooling operation, there is emergency stop (E9 is displayed) to stop the
compressor, and the drain pump is operated with the drain motor until reset of the float switch.
c) If a drain abnormality is detected during a stop state or fan operation, there is forced operation of the drain pump
for 5 minutes. After 5 minutes have elapsed, the drain motor stops if the float switch is reset. Otherwise, there is
emergency stop (E9 is displayed) and the drain motor operates until the float switch is reset.
d) If the float switch is not connected or if there is a disconnection, there is emergency stop.
16) Low voltage guard control
If the power source voltage remains at a value of 80% of rating or less for 3 continuous minutes during operation of the
compressor, the compressor stops (52C OFF). Furthermore, if the power source voltage remains at a figure of 15% of
rating or greater after 3 minutes have elapsed since stopping the compressor, there is restarting of the compressor (52C
ON). Moreover, during stoppage of the compressor.
Note (1) When starting the compressor for the first time after turning the operational switch ON, there is starting regardless of the power source voltage.
Furthermore, if dip switch SW 3-2 on the internal substrate is OFF, this becomes invalid. (Switch SW 3-2 is set to ON upon shipment from the
factory).
17) Refrigerant shortage error
When 52C is ON when operating in cooling (including automatic cooling), if heat exchanger sensor temperature for the
indoor unit (Th
I -R) does not drop to 25 °C or less for 40 minutes 5 minutes or more after the start of operation, an
abnormal stop due to insufficient refrigerant is performed.
18) External control (remote display)/control of input signal
a) External control (remote display) output
Following output connectors (CNT) are provided on the control circuit board of indoor unit.
¡ Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.
¡ Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating
operation.
¡ Compressor ON output: Power to engage DC 12V relay (provided by the customer) is outputted while the
compressor is operating.
¡ Error output: When any error occurs, the power to engage DC 12V relay (provided by the customer) is output-
ted.