Mitsubishi SRK25ZSP-W Service Manual page 14

c) Reset conditions:
(i) Heating low outdoor temperature protective control
(i) Protective control I
1) Operating conditions
2) Detail of operation
Models SRK25, 35
-10 -8 0
Outdoor air temperature(°C )
3) Reset conditions
a)
b)
• Model 50 Note (1) Values in (
Operating conditions: When the outdoor air temperature (TH2) is lower than 4ºC or higher continues for 30 seconds
1)
(j) Compressor overheat protection
(i) Purpose
2) Detail of operation:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor over-
Lower limit 29 rps
heat.
(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 speed is maintained for 60 second when the tempera-
ture 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 repeated until the compres-
sor speed is reached.
(4) Lower limit speed
Models SRK25, 35
Model SRK45
Normal operation
2 (-8)
changed as shown in the figure below.
Lower limit 45(55) rps
Lower limit 40 rps
Lower limit 38(40) rps
Normal operation
2 4
) are for the model SRK35.
while the compressor command speed is other than 0 rps.
The lower limit compressor command speed is change as shown in the figure belo.
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
Discharge pipe temperature (˚C)
Cooling Heating
15 rps 20 rps
20 rps 30rps
12
-
10 11 19
Outdoor air temperature(°C)
lower
Model SRK45
-8
Outdoor air temperature(°C )
4 (-6)
Normal operation
(3)
(3)
Lower limit (4)
(3)
100
-
20
'18 • SRK-SM-259
10 .
Lower limit 27 rps
Normal operation
-6
4 rps (1)
4 rps
0 rps
110