Protection Control; High Pressure Protection Control - Daikin VRV - WII Service Manual

Protection Control

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.
[In cooling operation]
Pc > 427.7psi
Pc > 507.5psi
Frequency control
Comp. upper limit down 3 steps/10 sec.
Less than
2 times within 30 min.
[In heating operation or simultaneous cooling/heating operation]
70
Normal operation
Comp. upper limit 216 Hz
Comp. 52Hz
Pc ≥ 526.3psi
High pressure standby
Pc > 426.3psi
Pc > 487.2psi
Frequency control
Compressor down 7 steps/10 sec.
Pc > 507.5psi
Master unit : 52Hz
Slave unit : stop
Pc ≥ 526.3psi
High pressure standby
Less than 2 times
within 30 min.
Pc: HP pressure sensor detection value
Pc < 397.3psi
INV upper limit frequency = 216 Hz
Pc < 468.3psi
Pc > 507.5psi
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3".
Normal operation
Pc < 397.3psi
Upper limit 216 Hz
Pc < 397.3psi
for each outside unit
INV upper limit up 1 step/30 sec.
When occurring 3 times within
30 min., HPS is activated without high
pressure standby, thus outputting the
malfunction code "E3" .
SiUS30-604
Function