Low Pressure Protection Control - Daikin SkyAir RZR-P Series Service Manual

Protection Control
4.2

Low Pressure Protection Control

Pe: Low pressure sensor detection value
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[Cooling]
Low pressure not limited
Pe < 36 psi
Low pressure
limited
Pe < 10 psi
[Heating]
• Pe > 36 psi
&
• Inverter upper limit
frequency
Low pressure limited
Function and Control
Pe > 57 psi
57Hz
Low pressure
standby
Low pressure not limited
Upper limit:
145.5Hz
Pe < 19 psi
Upper limit:
57Hz
Pe > 28 psi
Upper limit: 1-step up from
current compressor frequency
Pe > 28 psi (every 20 sec.)
Pe > 25 psi
SVP = OFF
Pe < 15 psi
Low pressure
standby
When occurring 3 times within 60 min.,
"E4
the error code " is output.
Pe < 23 psi
More than 145.5Hz
&
Pe < 23 psi
Pe < 19 psi
SVP = ON
Pe < 10 psi
When occurring 3 times within 60 min.,
the error code "
SVP: Solenoid valve (Hot gas)
E4
" is output.
SiUS281117
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