Protective Control Function; Frost Prevention Control; Cooling Overload Protective Control; Cooling High Pressure Control - Mitsubishi SCM40ZJ-S Service Manual

1.8 Protective control function

(1) Frost prevention control

(a) Operating conditions
8
(b) Detail of anti-frost operation
Operation mode
Item
Compressor operation
Indoor fan
(c) Reset conditions:

(2) Cooling overload protective control

(a) Operating conditions:
Item
Outdoor air temperature
Lower limit speed
Item
Outdoor air temperature
Lower limit speed
(b) Detail of operation
is reduced to 0 rps.
Note (1) Values in ( ) are for the model SCM100, 125ZJ-S1.
(c) Reset conditions:

(3) Cooling high pressure control

�Model SCM40, 45, 50, 60, 71, 80
(a) Purpose:
(b) Detector:
(c) Detail of operation:
(Example) Fuzzy
Protective control
Forced outage
Model
SCM40, 45ZJ-S, 50, 60, 71, 80ZJ-S1
Model
SCM100, 125ZJ-S1
25
Tho-R
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
2.5
Reset
Operation instruction
Depends on operation mode
Tho-A
31
30 (25) 40 (31)
30 (25) 40 (31)
(3) 8rps (1)
8rps
(3)
lower limit
(3)
speed 30 rps
58
60
0
- -
'11 • SCM-SM-110
Protective
control
2.5
Indoor heat exchanger
temperature (ºC)
ON1
OFF
40 41 46
Outdoor air temperature (
thermo becomes OFF, the speed
(1)
0rps
60
8
Reset
8
ON2
47
)
º C
20