Daikin REYQ72-432XAYCU, Service Manual

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SiUS371901EB Protection Control
Part 4 Functions and Control 142
6. Protection Control
6.1 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.
Cooling
N ormal control
21-step do w n 9-step u p
9-step do w n 3-step u p
2-step do w n
1-step u p 2-step do w n
After 10 seconds After 15 seconds
After 15 seconds After 10 seconds
Pc > 3.57 MPa
(51 8 psi)
Pc > 3.70 MPa
(537 psi)
Pc < 3.14 MPa
(455 psi)
Pc < 3.45 MPa
(500 psi)
Pc > 3.67 MPa
(532 psi)
Pc > 3.62 MPa
(525 psi)
Pc > 3.57 MPa
(51 8 psi)
Compressor step: 1
After 15 seconds
Pc < 3.33 MPa (4 8 3 psi)
After 10 seconds
Upper limit compressor step: max (Max. Step)
Pc > 3.72 MPa
(540 psi)
Pc: High press u re sensor
detection v al u e for each
o u tdoor u nit
C u rrent
step
maintained
A b normal stop
( E3 is displayed)
High press u re stand b y
(2 times w ithin 40 min u tes)
After 10
seconds
High press u re s w itch (4.0 MPa
(5 8 0 psi)) is acti v ated