Protection Control - Daikin RQYQ140-180PY1 Service Manual

Detailed Control Functions
2.6

Protection Control

2.6.1 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.
[In cooling operation]
★
In case of multi-outdoor-unit system, the following control is performed in the entire system.
Pc_max indicates the maximum value within the system.
Pc_max > 3.47 MPa
Compressor system:
2 step down / 10 sec.
[Heating Operation and Simultaneous Cooling / Heating Operation]
★
In case of multi-outdoor-unit system, the following control is performed in the entire system.
Pc_max indicates the maximum value within the system.
Pc_max > 3.04 MPa
Compressor system:
2 step down / 10 sec.
47
Normal Operation
&
&
Compressor system: Step 1
Pc_max > 3.64 MPa
Restart standby
(2 times per 30 min. at max.)
Normal Operation
Pc_max < 2.79 MPa
Compressor system: Step 1
Pc_max > 3.20 MPa
Restart standby
(2 times per 30 min. at max.)
Compressor step = Max. Step
· Pc_max < 3.24 MPa
· After 15 sec.
· Pc_max > 3.47 MPa
· After 15 sec.
• Pc_max > 3.55 MPa
&
• After 10 sec.
Stop due to malfunction
(E3 displayed)
Compressor step = Max. Step
• Pc_max > 3.12 MPa
&
• After 10 sec.
Stop due to malfunction
(E3 displayed)
Compressor system:
1 step up / 15 sec.
HPS (4.0 MPa) is activated
Compressor system:
1 step up / 10 sec.
HPS (4.0 MPa) is activated
SiBE341001
Function