Cooling High Pressure Control - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

Item
Outdoor air temperature
Lower limit speed
(b) Detail of operation
(c) Reset conditions:

(3) Cooling high pressure control

(a) Purpose:
(b) Detector:
(c) Detail of operation:
(Example) Fuzzy
(4) Cooling low outdoor temperature protective control
(a) Operating conditions: When the outdoor air temperature (Th2) is 22°C or lower continues for 20 seconds while com-
(b) Detail of operation:
The lower limit of compressor command speed is set to B or D rps and even if the speed becomes lower than B or D
rps, the speed is kept to B or D rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.
The upper limit of compressor command speed is set to A or C rps, the speed is kept to A or C rps.
Values of A ~ D
A
B
C
D
(c) Reset conditions: When the either of the following condition is satisfied
When the outdoor air temperature (Th2) becomes 25°C or higher.
When the compressor command speed is 0rps.
Model
SCM 40~80 ZJ-S
h
After lapse of 30 sec. or over
After lapse of 30 sec. or over
After lapse of 30 sec. or over
53
Outdoor heat exchanger temperature (°C)
60
pressor command speed is other than 0 rps.
Upper limit C rps
ON
Lower limit D rps
0 3
Outdoor air temperature.(°C)
Model
SCM40ZJ-S SCM45ZJ-S
75 rps 75 rps
35 rps 35 rps
60 rps 60 rps
45 rps 45 rps
8rps (1)
(3)
8rps (1)
(3)
lower limit
(3)
speed 30 rps
58
60
ON
Upper limit A rps
Lower limit B rps
22 25
SCM50ZJ-S SCM60ZJ-S
75 rps 75 rps
35 rps 30 rps
60 rps 60 rps
45 rps 40 rps
34
- -
ON1
'10 • SCM-SM-094
OFF
40 41 46
Outdoor air temperature (
0rps
60
8
OFF
SCM71ZJ-S
75 rps
30 rps
60 rps
40 rps
ON2
47
)
º
C
20
SCM80ZJ-S
75 rps
30 rps
60 rps
40 rps