![background image](http://html2.mh-extra.com/html/daikin/rweyq72ptju/rweyq72ptju_service-manual_4706402063.webp)
SiUS30-1301
Protection Control
Function and Control
55
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]
Pc: High pressure sensor detection value for each condensing unit
[In heating or simultaneous cooling/heating]
High pressure standby
Normal operation
Pc > 427.7 psi
Pc < 397.3 psi
Pc < 468.3 psi
Comp. upper limit 216 Hz
Pc > 507.5 psi
INV. upper limit frequency = 216 Hz
INV. upper limit up 1 step/30 sec.
Pc > 507.5 psi
Frequency control
Pc
≥
526.3 psi
Comp. 52 Hz
Less than 2 times
within 30 minutes
S1PH (High pressure switch) is activated.
(580 psi)
Stop due to error
(Error code "
E3
" is displayed.)
Comp. upper limit down
3 steps/10 sec.
High pressure standby
Normal operation
Pc > 427.7 psi
Pc > 487.2 psi
Pc < 397.3 psi
Upper limit 216 Hz
Frequency control
Pc
≥
526.3 psi
Pc < 433.6 psi
Less than 2 times
within 30 minutes
S1PH (High pressure switch)
is activated. (580 psi)
Stop due to error
(Error code "
E3
" is displayed.)
Pc > 507.5 psi
Compressor down 7
steps/10 sec.
Master unit: 52 Hz
Slave unit: stop