Protection Control; High Pressure Protection Control - Daikin RMXS-L Series Service Manual

SiUS181305E

4. Protection Control

4.1

High Pressure Protection Control

Outline
High pressure protection control is used to prevent the activation of protection devices due to an
abnormal increase of high pressure and to protect compressors against the temporary increase of
high pressure.
<Cooling Operation>
Pc > 3.47 MPa (1161 ftAq)
High pressure limited
Pc < 3.23 MPa (1081 ftAq)
<Heating Operation>
Pc > 3.04 MPa (1017 ftAq)
High pressure limited
Pc < 2.94 MPa (984 ftAq)
Function
High pressure not limited
Upper limit frequency = Max
Upper limit frequency: 3-step down
After 10 sec. Pc > 3.47 MPa (1161 ftAq)
Keeping the current step
After 15 sec.
Upper limit frequency: 1-step up
Pc > 3.64 MPa (1218 ftAq)
High pressure
standby
High pressure drop
High pressure not limited
Pc < 2.89 MPa (967 ftAq)
Upper limit frequency: 1-step down
After 10 sec. Pc > 3.04 MPa (1017 ftAq)
Keeping the current step
After 60 sec.
Upper limit frequency: 1-step up
Pc > 3.64 MPa (1218 ftAq)
High pressure
standby
Pc: High pressure sensor detection value
When occurring 10 times within 60 minutes,
the high pressure switch is activated without
high pressure standby, and the error code
E3 is output.
Pc: High pressure sensor detection value
When occurring 10 times within 60 minutes,
the high pressure switch is activated without
high pressure standby, and the error code
E3 is output.
Protection Control
(R19079)
(R19080)
50