Protection Control; High Pressure Protection Control - Daikin CMSQ200A7W1B Service Manual

SiBE28-805

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 abnormal increase of high pressure and to protect compressors against the transient
increase of high pressure.
[In cooling operation]
★
Pc>3.43MPa
INV upper limit frequency:
3-step down from current
compressor rps
Pc>3.43MPa
[In heating operation]
★
Pc>3.10 MPa
System load down 1 steps
Pc>3.10 MPa
Pc>3.49 MPa
EV1 opening adjustment
(Reducing low pressure to make
high pressure lower.)
Function
In the case of multi-outdoor-unit system, each outdoor unit performs this control
individually in the following sequence.
High pressure not limited
INV upper limit
After 10 sec.
Current step maintained
Pc>3.64MPa
High pressure standby
In the case of multi-outdoor-unit system, the entire system performs this control in the
following sequence.
High pressure not limited
Pc<2.9 MPa
After 10 sec.
Current step maintained
Pc<2.52MPa
Pc>3.64 MPa
High pressure standby
Pc: HP pressure sensor detection
value for each outdoor unit
= max
rps
Pc<3.24MPa INV upper limit
1-step up from current
compressor frequency
After 15 sec.
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3" .
Pc: HP pressure sensor detection
value for master unit
Pc<3.0MPa
INV upper limit
rps: 1-step up
After 60 sec.
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3" .
Protection Control
:
frequency
47