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144
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'16 • PAC-T-240
(14) Current cut
(a) Purpose:
Inverter is protected from overcurrent.
(b) Detail of operation:
Output current from the inverter is monitored with a shunt resistor and, if the current exceeds the
setting value, the compressor is stopped immediately. Operation starts again after a delay time of
3 minutes.
(15) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air conditioning.
The compressor is stopped if any one of the following in item (a), (b) is satisfied. Once the unit is stopped by this function, it is not
restarted.
(a) When the input current is measured at 1 A or less for 3 continuous minutes or more.
(b) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being turned on.
(16) Serial signal transmission error protection
(a) Purpose:
Prevents malfunction resulting from error on the indoor ↔ outdoor signals
.
(b) Detail of operation:
If the compressor is operating and a serial signal cannot be received from the indoor control with
outdoor control having serial signals continues for 7 minute and 35 seconds, the compressor is
stopped.
After the compressor has been stopped, it will be restarted after the compressor start delay if a serial
signal can be received again from the indoor control.
(17) Rotor lock
If the motor for the compressor does not turn after it has been started, it is determined that a compressor lock has occurred and
the compressor is stopped.
(18) Refrigeration cycle system protection
(a) Starting conditions
(i) When S minutes have elapsed after the compressor ON or the completion of the defrost control
(ii) Other than the defrost control
(iii) When, after meeting the conditions of (i) and (ii) above, the compressor speed, indoor air temperature (Thi-A) and
indoor heat exchanger temperature (Thi-R) have met the conditions in the following table for 5 minutes:
Compressor speed (N)
S (min)
5
5
Cooling
Heating
Indoor air temperature (Thi-A)
Thi-A−4<Thi-R
Thi-A+6>Thi-R
Indoor air temperature (Thi-A)/
Indoor heat exchanger temperature (Thi-R)
Operation mode
30 N
<
=
30 N
<
=
10 Thi-A
40
<
=
<
=
0 Thi-A
40
<
=
<
=
(b) Contents of control
(i) When the conditions of (a) above are met, the compressor stops.
(ii) Error stop occurs when the compressor has stopped 3 times within 60 minutes.
(c) Resetting condition
When the compressor has been turned OFF
(19) Silent mode
As “Silent mode start” signal is received from the remote control, it operates by dropping the outdoor fan tap.
Outdoor fan tap (Upper limit)
Cooling
3rd speed
Heating
3rd speed
