Daikin EWYQ021BAWP [62/223] Protection control

Daikin EWYQ021BAWP [62/223] Protection control
ESIE11-05 Protection Control
Functional Description 51
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 case of EW*Q040BA, 050BA, 064BA, each outdoor unit performs this control individually in
the following sequence.
High pressure not limited
Pc>3.54MPa
High pressure standby
INV upper limit
rps
= max
Current step maintained
Pc>3.54MPa
Pc>3.7MPa
After 10 sec.
After 10 sec.
Pc>3.6MPa
STD compressor
standby
Pc: HP pressure sensor detection
value for each outdoor unit
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code “E3”.
INV upper limit frequency:
3-step down from current
compressor rps
(Slave unit: 3-step down as well)

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