'18 • SRK-SM-259
-
13
-
(k) Current safe
(i) Purpose
Current is controlled not to exceed the upper limit of the setting operation current.
(ii) Detail of operation
Input current to the converter is monitored with the current sensor xed on the printed circuit board of the outdoor
unit and, if the operation current value reaches the limiting current value, the compressor speed is reduced.
If the mechanism is actuated when the compressor speed is less than 30 rps, the compressor is stopped immediately.
Operation starts again after 3 minutes.
(l) 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 3 minutes.
2) If the temperature of 110ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately.
When the discharge pipe temperature drops and 3 minutes has elapsed, the unit starts again within 1 hour but there
is no start at the third time.
(m) 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 (i), (ii) is satised. Once the unit is stopped by this func-
tion, 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.
(n) 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.
(o) Serial signal transmission error protection
(i) Purpose
(ii) Detail of operation
(p) Rotor lock
(q) Outdoor fan motor protection
(r) Outdoor fan control at low outdoor temperature
Cooling
1) Operating conditions
(s) Refrigeration cycle system protection
(i) Starting conditions
2) Detail of operation
3) Reset conditions
Heating
1) Operating conditions
2) Detail of operation
3) Reset conditions
Outdoor temperature > 10˚C
Outdoor temperature
<
=
10˚C
Outdoor fan
a)
min
-1
-
-
b)
a)
b)
a)
b)
1)
2)
c)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost operation
Other than the defrost operation
(ii) Contents of control
1)
(iii) Reset condition
When the compressor has been turned OFF.
2)
When the conditions of (i) above are satisfied, the compressor stops.
Error stop occurs when the compressor has stopped 3 times within 60 minutes.
3)
When, after satisfying the conditions of 1) and 2) above, the compressor speed, indoor air temperature (Th1) and indoor
heat exchanger temperature (Th2) have satisfying the conditions in the following table for 5 minutes:
Compressor speed (N)Operation mode
Cooling
Heating(1)
Indoor air temperature (Th1)
Th1−4<Th2
Room temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
50 N
<
=
10 Th1 40
<
=
<
=
0 Th1 40
<
=
<
=
50 N
<
=
Th1
<
21℃
DXK09
8th speed
9th speed
Th1
21℃
8th speed
; model DXK09 : refer to belows
8th speed
Note(1)
When the fan speed is set at any other than HI during heating operation.
ON1
ON2
>
=
-1 1 4 6
Outdoor air temperature(°C )
ON1
ON2
OFF
(i)
(ii)
models DXK12, 15 : 8th speed)
(q) Outdoor fan motor protection
(r) Outdoor fan control at low outdoor temperature
Cooling
1) Operating conditions
(s) Refrigeration cycle system protection
(i) Starting conditions
2) Detail of operation
3) Reset conditions
Heating
1) Operating conditions
2) Detail of operation
3) Reset conditions
Outdoor temperature > 10˚C
Outdoor temperature
<
=
10˚C
Outdoor fan
a)
b)
a)
b)
a)
b)
1)
2)
c)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost operation
Other than the defrost operation
3)
When, after satisfying the conditions of 1) and 2) above, the compressor speed, indoor air temperature (Th1) and indoor
heat exchanger temperature (Th2) have satisfied the conditions in the following table for 10 (SRK45:5) minutes:
Compressor speed (N)Operation mode
Cooling
Heating(1)
Indoor air temperature (Th1)
Th1−4<Th2
Room temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
50 N
<
=
10 Th1 40
<
=
<
=
0 Th1 40
<
=
<
=
50 N
<
=
(i)
(ii)
Except that the fan speed is HI in heating operation.
Values in ( ) are for the model SRK35.
(model SRK45:0 )
min
-1
-
-
(model SRK45:2 )
; models SRK25, 35 : refer to belows,
model
SRK45 : 8th speed)
Th1
<
21℃
SRK25, 35
8th speed
9th(8th) speed
Th1
21℃
8th speed
8th speed
ON1
ON2
>
=
-1 1 4 6
Outdoor air temperature(°C )
ON1
ON2
OFF
24
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