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60
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'13 • SRK-T-144
• Models SRK50, 60
(i) Operating conditions:
When the outdoor air temperature (TH2) is lower than 4ºC or higher continues for 30 sec-
onds while the compressor command speed is other than 0 rps.
(ii)
Detail of operation:
The lower limit compressor command speed is change as shown in the gure below.
(iii)
Reset conditions:
When either of the following condition is satised.
1)
The outdoor air temperature (TH2) becomes 6ºC.
2)
The compressor command speed is 0 rps.
-8 -6
Lower limit 45 rps
Lower limit 35 rps
Normal operation
4 6
Outdoor air temperature C)
(i) Compressor overheat protection
(i) Purpose:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the
compressor overheat.
(ii)
Detail of operation
1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Discharge pipe temperature (˚C)
Lower limit
(4)
After lapse of 3 min. or over
(3)
After lapse of 3 min. or over
(3)
After lapse of 3 min. or over
(3)
4 rps
4 rps
(1)
0 rps
(Example) Fuzzy
90 (95) 100 (105) 110 (115)
Notes
(1) When the discharge pipe temperature is in the range of 100~110
ºC (105~115ºC), the speed is reduced by 4 rps.
(2)
When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.
(3) If the discharge pipe temperature is in the range of 90~100ºC (95~105ºC) even when the compressor command speed is maintained for 3 min-
utes when the temperature is in the range of 90~100ºC (95~105ºC), the speed is raised by 1 rps and kept at that speed for 3 minutes. This
process is repeated until the command speed is reached.
(4)
Lower limit speed
2) If the temperature of 110ºC (115ºC) is detected by the sensor on the discharge pipe, then the compressor will stop
immediately.
When
the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1
hour but there is no start at the third time.
(j)
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 command speed is reduced.
If the mechanism is actuated when the compressor command speed is less than 30 rps, the com-
pressor is stopped immediately. Operation starts again after a delay time of 3 minutes.
Cooling Heating
Lower Limit Speed
SRK20~35
20 rps 30 rps
SRK50, 60
25 rps 32 rps
Item
Model
(5)
Value in ( ) are for the model SRK50, 60.
61


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