'20 • SR-SM-285
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43
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(8) Compressor overheat protection
(a) Purpose
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor overheat.
(b) Detail of operation
1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Notes (1) When the discharge pipe temperature is in the range of 100-110ºC, 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 even when the compressor command speed is maintained for 3 minutes when the temperature is
in the range of 90-100ºC, 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
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
100
110
(Example) Fuzzy
90
Cooling
Heating
Lower limit speed
15 rps
20 rps
Item
Model
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 the time delay of 3 minutes is over, the unit starts again within 1 hour
but there is no start at the third time.
(9) Current safe
(a) Purpose
Current is controlled not to exceed the upper limit of the setting operation current.
(b) Detail of operation
Input current to the converter is monitored with the current sensor fixed 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 mecha-
nism is actuated when the compressor command speed is less than 30 (36:SRR35) rps, the compressor is stopped immedi-
ately. Operation starts again after a delay time of 3 minutes.
1)
Operating conditions
2)
Detail of operation
(7) Heating low outdoor temperature protective control
3) Reset conditions
-10
-8
-2
2
Lower limit 45 rps
Lower limit 40 rps
Normal operation
Outdoor air temperature(°C )
a)
b)
(a) Protective control
I
2
changed as shown in the figure below.
3
-2
3
Summary of Contents for SRR25ZS-W
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