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c)
Reset conditions:
(h) Heating low outdoor temperature protective control
Protective control I
(i)
1) Operating conditions:
2) Detail of operation:
3)
Reset conditions:
a)
b)
Note (1) Values in ( ) are for the model SRK45.
• Model 50
Protective control II (Models SRK20, 25, 35 only)
(ii)
Operating conditions: When the outdoor air temperature (TH2) is lower than 4ºC or higher continues for 30 seconds
1)
Operating conditions: When the outdoor heat exchanger sensor (TH1) is -10ºC or lower continuously for 10 min-
1)
2)
Detail of operation:
2)
Detail of operation:
Lower limit 29 rps
3)
Reset conditions:
a)
When the outdoor heat exchanger sensor (TH1) becomes -8ºC or higher.
b)
When the compressor command speed is 0 rps.
(i)
Compressor overheat protection
Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the
(i)
compressor overheat.
(ii)
Detail of operation
1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
(Example) Fuzzy
Notes (1) When the discharge pipe temperature is in the range of 100 to 110 ºC, 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 60 seconds when
the temperature is in the range of 90-100ºC, the speed is raised by 1 rps and kept at that speed for 60 second. This process is repeateds until
the command speed is reached.
(4) Lower limit speed
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.
Normal operation
When the outdoor air temperature (TH2) is lower than 2 (4)ºC or higher continues for 30
-10 (-2)
-8 (0) 2 (4)
Outdoor air temperature(°C )
becomes 4 (6)ºC.
while the compressor command speed is other than 0 rps.
utes while the compressor command speed is other than 0 rps.
The lower limit compressor command speed is change as shown in the figure belo.
Upper limit of compressor command speek is 115rps.
When the either of the following condition is satisfied.
4
6
Outdoor air temperature(°C)
After lapse of 60 seconds. or over
After lapse of 60 seconds. or over
After lapse of 60 seconds. or over
90
Cooling
All models
20 rps
10
11
19
Outdoor air temperature(°C)
10
Lower limit 60 (50) rps
Lower limit 40 (30) rps
Normal operation
4 (6)
Normal operation
(3)
(3)
Lower limit
(3)
100
Discharge pipe temperature (˚C)
Heating
30 rps
73
-
-
20
'17 • SRK-T-206
.
changed as shown in the figure below.
(1)
4 rps
4 rps
(4)
0 rps
110
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Troubleshooting
