Service manual

SiUS12-928_B Control Specification
Function and Control 58
3.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The
function is not used when defrosting.)
3.4 Discharge Pipe Temperature Control
Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the
discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep
the discharge pipe temperature from rising further.
Detail
A (Hz) 55
B (Hz) 65
C (Hz) 80
D (seconds) 120
E (seconds) 200
F (seconds) 470
A
DEF
B
C
(R13528)
(Hz)
Frequency
(sec.)
Time
Zone Control
Stop zone When the temperature reaches the stop zone, the compressor stops.
Dropping zone The upper limit of frequency decreases.
Keep zone The upper limit of frequency is kept.
Reset zone The upper limit of frequency is canceled.
248°F (120°C)
231.8°F (111°C)
228.2°F (109°C)
224.6°F (107°C)
224.6°F (107°C)
A
B
C
D
E
Reset zone
Stop zone
Dropping
zone
Keep
zone
(R14266)
A
C
D
E
B
Discharge pipe
temperature
 The temperatures D and E are the same.