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'13 • SRK-T-144
(n) Serial signal transmission error protection
(i) Purpose:
Prevents malfunction resulting from error on the indoor
outdoor signals.
(ii)
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 compres-
sor is stopped.
After the compressor has been stopped, it will be restarted after the compressor start delay if a se-
rial signal can be received again from the indoor control.
(o)
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.
(p)
Outdoor fan motor protection
If the outdoor fan motor has operated at 75 min
-1
or under for more than 30 seconds, the compressor and fan motor are stopped.
(k) Current cut
(i) Purpose:
Inverter is protected from overcurrent.
(ii)
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.
(I) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air conditioning.
T
he compressor is stopped if any one of the following in item (i), (ii) is satised. Once the unit is stopped by this function, it is not
restarted.
(i)
When the input current is measured at 1 A or less for 3 continuous minutes or more.
(ii) 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.
(m) Indoor fan motor protection
When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300
min
-1
or under for more than 30 seconds, the unit enters rst in the stop mode and then stops the entire system.
(q) Outdoor fan control at low outdoor temperature
(i) Cooling
1) Operating conditions:
When the outdoor air temperature (TH2) is 22
ºC or lower continues for 30 seconds
while the compressor command speed is other than 0 rps.
2)
Detail of operation:
After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat
exchanger temperature shall implement the following controls.
a)
Outdoor heat exchanger temperature
=
<
21ºC
After
the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger tempera-
ture is lower than 21ºC, gradually reduce the outdoor fan speed by 1 speed. (Lower limit 1st speed)
b)
21ºC < Outdoor heat exchanger temperature
=
<
38ºC
After
the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature
is 21ºC-38ºC, maintain outdoor fan speed.
c)
Outdoor heat exchanger tempeature > 38ºC
After
the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
higher than 38ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 3rd speed)
3)
Reset conditions:
When either of the following conditions is satised
a)
The outdoor air temperature (TH2) is 25ºC or higher.
b)
The compressor command speed is 0 rps.
Outdoor temperature > 10˚C
Outdoor temperature
<
=
10˚C
2nd speed
Outdoor fan
1st speed
¡
Value of A
62


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