Daikin VRV IV-S RXTQ-TAVJU Series, Руководство по обслуживанию

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SiUS331604E Protection Control
Functions and Control 46
4.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against transient decreases in low pressure.
Cooling operation
Heating operation
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: Low pressure sensor detection value
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
&
• Ts – Teg < 8˚C (14.4˚F)
• Pe > 0.06 MPa (8.7 psi)
• Pe > 0.09 MPa (13.1 psi)
OR
After 10 seconds Pe < 0.17 MPa (24.7 psi)
Pe < 0.17 MPa (24.7 psi)
Pe > 0.20 MPa (29.0 psi)
Pe < 0.07 MPa (10.2 psi)
Current step limited
After 15 seconds
Low pressure not limited
Low pressure limited
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Pe: Low pressure sensor detection value
Compressor upper limit
frequency: 3-step down from
current compressor frequency
When occurring 3 times within 30 minutes,
the error code
E4
is output.
Pe < 0.12 MPa
(17.4 psi)
Pe > 0.17 MPa
(24.7 psi)
Hot gas bypass valve: OFF
Hot gas bypass valve: ON
Low pressure
standby