Protection Control SiUS281811EA
118 Part 4 Functions and Control
Heating operation
4.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient decrease
of low pressure.
Pe: Low pressure sensor detection value
Cooling
operation
High pressure drop
Pc
>
3.04 MPa (441 psi)After 10 sec.
Pc
>
3.04 MPa (441 psi)
Pc
<
2.94 MPa (426 psi)
Pc > 3.64 MPa (528 psi)
Current step maintained
After 60 sec.
High pressure not limited
High pressure limited
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Compressor upper limit
frequency: 1-step down from
current compressor frequency
When occurring 10 times within 60
minutes, high pressure switch is activated
without high pressure standby, thus
outputting the error code E3.
Pc
<
2.89 MPa (419 psi)
High pressure
standby
Pe < 0.25 MPa
(36.3 psi)
36 Hz Unload
Pe > 0.39 MPa
(56.6 psi)
Pe
<
0.07 MPa
(10.2 psi)
Low pressure not limited
Pe < 0.15 MPa
(21.8 psi)
Pe > 0.30 MPa
(43.5 psi)
Hot gas bypass valve: OFF
Hot gas bypass valve: ON
When occurring 3 times within 30 minutes,
the error code E4
is output.
Low pressure
standby
Low pressure
limited
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