Protection Control; High Pressure Protection Control - Daikin VRV EMERION RXYQ-AATJA Service Manual

Protection Control

6. Protection Control

6.1

High Pressure Protection Control

This high pressure protection control is used to prevent the activation of protection devices due to
abnormal increase of high pressure and to protect compressors against the transient increase of
high pressure.
Cooling
The following control is performed in the entire system.
Heating
The following control is performed in the entire system.
111
Normal control
Pc > 3.55 MPa
(515 psi)
Reduce compressor capacity step
Pc > 3.72 MPa
(540 psi)
High pressure standby
Normal control
Pc > 3.04 MPa
(441 psi)
Reduce compressor capacity step
Pc > 3.72 MPa
(540 psi)
High pressure standby
Pc: High pressure sensor detection
Pc < 3.04 MPa
value for each outdoor unit.
(441 psi)
When occurring 3 times within 40
minutes, high pressure switch is
activated without high pressure standby,
thus outputting the error code E3.
Pc < 2.89 MPa
(419 psi)
When occurring 3 times within 40
minutes, high pressure switch is
activated without high pressure standby,
thus outputting the error code E3.
SiUS342303E
Part 4 Functions and Control