Protection Control; High Pressure Protection Control - Daikin RXYQ-TA Series 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.
Pc > 3.55 MPa
(515 psi)
Heating
The following control is performed in the entire system.
Pc > 3.04 MPa
(441 psi)
Reduce compressor capacity step
61
Normal operation
Reduce compressor capacity step
Pc > 3.72 MPa
(539 psi)
High pressure standby
Normal operation
Pc < 2.89 MPa
Pc > 3.72 MPa
(539 psi)
High pressure standby
Pc: High pressure sensor detection
Pc < 3.04 MPa
(441 psi)
When occurring 4 times within 40
minutes, high pressure switch is
activated without high pressure standby,
thus outputting the error code E3.
(420 psi)
When occurring 4 times within 40 minutes,
high pressure switch is activated without
high pressure standby, thus outputting the
error code E3.
value for each outdoor unit.
SiUS341615E
Functions and Control