Protection Control; High Pressure Protection Control - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

SiUS331604E

4. Protection Control

4.1

High Pressure Protection Control

This high pressure protection control is used to prevent the activation of protection devices due to an abnormal
increase in high pressure and to protect compressors against transient increases in high pressure.
Cooling operation
Pc > 3.47 MPa (503 psi)
High pressure limited
Pc < 3.23 MPa (468 psi)
Functions and Control
High pressure not limited
Compressor upper limit frequency: Maximum
Compressor upper limit
frequency: 3-step down from
current compressor frequency
After 10 sec. Pc > 3.47 MPa (503 psi)
Current step maintained
After 15 sec.
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Pc > 3.64 MPa (528 psi)
High pressure
standby
Pc: High pressure sensor detection value
When occurring 10 times within 60
minutes, high pressure switch is activated
without high pressure standby, thus
E3
outputting the error code

Protection Control

.
44