Daikin VRV EMERION RXYQ-AATJA, Service Manual

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Protection Control SiUS342303E
111 Part 4 Functions and 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.
Normal control
High pressure standby
Reduce compressor capacity step
When occurring 3 times within 40
minutes, high pressure switch is
activated without high pressure standby,
thus outputting the error code
E3 .
Pc: High pressure sensor detection
value for each outdoor unit.
Pc > 3.55 MPa
(515 psi)
Pc < 3.04 MPa
(441 psi)
Pc > 3.72 MPa
(540 psi)
Normal control
High pressure standby
Reduce compressor capacity step
When occurring 3 times within 40
minutes, high pressure switch is
activated without high pressure standby,
thus outputting the error code
E3 .
Pc > 3.04 MPa
(441 psi)
Pc < 2.89 MPa
(419 psi)
Pc > 3.72 MPa
(540 psi)