(9) Inching prevention
When the compressor becomes to the thermostat operation within 5 minutes since operation start or becomes dehumidifying op-
eration, the operation is continued with the compressor speed of minimum rps forcibly.
(8) Crankcase heater
(a) Operating conditions
This control starts
when all the conditions below are satised.
(i) After the operation mode is changed to stop and the compressor speed becomes 0 rps continuously for 30 minutes.
(ii) When the temperature detected by the outdoor air temperature (Tho-A) is -2°C or lower after the compressor stops.
(7) Refrigeration cycle system protective control
(a) Starting condition
This control starts when the following conditions are satised.
(i)
When it has elapsed 30 minutes after the compressor was changed from OFF to ON in the cooling operation mode
for more than 5 minutes.
(ii)
When the compressor speed has satised the following conditions.
(iii)
When the indoor air temperature of running indoor unit (Th1) and the indoor heat exchanger temperature (Th2) have
satised the following condition even on one unit.
(b) Contents of control
(i) Stop the compressor and delay the start, and then restarts.
(ii) Compressor stops by the abnormal stop when the compressor stop has occurred 3 times in one hour.
Unit
Compressor
speed
Indoor air temperature
(Th1, °C)
Indoor air temperature (Th1) and indoor
heat exchanger temperature (Th2)
Duration
1
60 rps
10
<
=
Th1
<
=
40
Th1 - 4 < Th2
5 minute
2
70 rps
3
80 rps Th1 - 3 < Th2
(b) Detail of operation
The crankcase heater operates, warming up the compressor, then refrigerant begins circulating smoothly when the air-
conditioner starts its heating operation, and heating begins.
(c) Reset conditions
When the temperature detected by the outdoor air temperature (Tho-A) reaches 0°C or higher, or the operation mode
changes from stop to cooling or heating.
(10) Compressor overheat protection
(a) Purpose
(b) Detail of operation
(i)
Discharge pipe temperature (˚C)
(Example) Fuzzy
95 105 115
3 minutes
3 minutes
3 minutes
speed 32 rps
105
115
95
105
95
105
3 minutes
3 minutes
Tho-D
(ii)
(ii)
(i)
(11) Current safe
(a) Purpose
(b) Detail of operation
Cooling Heating
Lower limit speed
Item
Model
115
SCM40, 45, 50
SCM60, 71, 80
32 rps 32 rps
32 rps25 rps
SCM100, 125
22 rps20 rps
-
194
-
'16 • SCM-T-199
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