Mitsubishi Heavy Industries SRC25ZMP-S Technical Manual page 35

(c) Cooling overload protective control
(i) Operating conditions: When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41ºC or
(ii) Detail of operation
1) The outdoor fan is stepped up by 3 speed step. (Upper limit 8th speed.)
2) The lower limit of compressor command speed is set to 30 or 40 (model SRK45 : 30) rps and even if the calculated result
becomes lower than that after fuzzy calculation, the speed is kept to 30 or 40 (model SRK45 : 30) rps. However, when the
thermo OFF, the speed is reduced to 0 rps.
(iii) Reset conditions: When either of the following condition is satisfied.
1) The outdoor air temperature is lower than 40ºC.
2) The compressor command speed is 0 rps.
(d) Cooling high pressure control
(i) Purpose: Prevents anomalous high pressure operation during cooling.
(ii) Detector: Outdoor heat exchanger sensor (TH1)
(iii) Detail of operation:
(Example) Fuzzy
Notes (1) When the outdoor heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 8 rps at each 20 seconds.
(2) When the temperature is C ºC or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of A~B ºC, if the compressor command speed is been maintained and the operation has
continued for more than 20 seconds at the same speed, it returns to the normal cooling operation.
¡ Temperature list
Outdoor air temperature > = 32 ºC
Outdoor air temperature < 32 ºC
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions:
(ii) Detail of operation:
1)
than 50
speed is
2)
(3) Values in 〔 〕 are for the model SRK45.
Upper limit 50 rps
ON
Lower limit 50 44 rps
E F
Outdoor air temperature.(°C )
more, or 47ºC or more (Model SRK45: 41ºC or more) with the compressor running, the lower
limit speed of compressor is brought up.
Item
Outdoor air temperature
Lower limit speed
After lapse of 20 sec. or over
After lapse of 20 sec. or over
After lapse of 20 sec. or over
A
Outdoor heat exchanger temperature(°C)
A
50
42
〔 44 〕 <44> (30) rps, the speed is kept to 50
A
C
ON Upper limit 50 rps
Lower limit 44 rps
Upper limit 60 rps
ON
Lower limit 30 rps
A B C D
Model
SRK25, 35ZMP-S
41°C or more
30 rps
(3)
(3)
(3)
B C
52 56
44 50
〔 44 〕
〔 44 〕 <44> (30) rps. However, when the thermo OFF, the
B
D
34
- -
OFF
'13 • SRK-T-140
SRK45ZMP-S
47°C or more 41°C or more
40 rps
8rps (1)
(1)
8rps
0rps
B C
'09•SRK-DB-087D
30 rps