SiUS28-902_a
Protection Control
Function
30
4.2
Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[In cooling operation]
[In heating operation]
Pe
<
36 psi
57Hz
Pe
>
57 psi
Pe
<
10 psi
Low pressure not limited
Low pressure
standby
Low pressure
limited
Pe: LP pressure sensor detection
value
When occurring 3 times within 60 min.,
the malfunction code "
E4
"
is output.
Pe
<10 psi
145.5Hz
Upper limit:
Upper limit:
57Hz
Upper limit: 1-step up from
current compressor frequency
&
• Pe>36 psi
• INV. upper limit
frequency
&
More than 145.5Hz
Pe<23 psi
SVP = OFF
SVP = ON
Low pressure not limited
Low pressure
standby
Low pressure limited
Pe>28 psi (every 20 sec.)
Pe>25 psi
Pe<19 psi
Pe<19 psi
Pe<23 psi
Pe<15 psi
Pe>28 psi
When occurring 3 times within 60 min.,
the malfunction code "
E4
"
is output.
Pe: LP pressure sensor detection
value
Summary of Contents for SkyAir FCQ18PVJU
Page 1: ...Split System Air Conditioners SkyAir Inverter R 410A Heat Pump 60Hz P Series SiUS28 902_a...
Page 44: ...Other Control SiUS28 902_a 37 Function...
Page 81: ...SiUS28 902_a Troubleshooting by Remote Controller Troubleshooting 74...
Page 185: ...SiUS28 902 Precautions for New Refrigerant R 410A Precautions for New Refrigerant R 410A 178...