Protection Control; High Pressure Protection Control - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

Protection Control

4. Protection Control

High Pressure Protection Control

4.1
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 heating operation [R-410A]
Pc>3.04MPa
High pressure limited
62
High-pressure drop
High pressure not limited
Pc<2.89MPa
INV upper limit frequency :
1-step down from current
compressor frequency
After 10 sec. Pc>3.04MPa
Keeping the current step
Pc<2.94MPa After 60 sec.
INV upper limit frequency :
1-step up from current
compressor frequency
Pc>3.64MPa
High pressure
standby
Pc: HP pressure sensor detection value
When occurring 10 times within 60
minutes, HPS is activated without
high pressure standby, thus
outputting the malfunction code "E3".
ESIE09-08A
Function