SiUS30-1301
Protection Control
Function and Control
57
(When the condensing unit heat exchanger is used as condensing.)
Pe: Value detected by low pressure sensor for each condensing unit
Note:
1 This frequency control is carried out in each condensing unit.
6.3
Discharge Pipe Protection Control
This discharge pipe protection control protects the compressor internal temperature against an
error or transient increase of discharge pipe temperature.
Discharge pipe protection control is carried out in each condensing unit.
[INV. compressor]
HTdi: Value of INV. compressor discharge pipe temperature compensated with outdoor air
temperature
Low pressure standby
Normal operation
Pe < 63.8 psi
Compressor 52 Hz
Pe < 10.1 psi
When occurring 4 times within 60 minutes,
the error code “
E4
” is displayed.
Less than 3 times
within 60 minutes
Pe > 71.0 psi
Pe < 49.3 psi
Pe < 63.8 psi
Compressor upper limit
frequency = 216 Hz
Compressor upper limit down
3 steps/10 seconds
Compressor upper limit up
1 step/20 seconds
OR
OR
HTdi < 212˚F
HTdi < 230˚F
HTdi > 239˚F
HTdi > 239˚F
Normal operation
Discharge pipe
temperature control standby
HTdi > 266˚F
HTdi > 248˚F
for 5 minutes
HTdi > 275˚F
HTdi > 248˚F for 10 minutes or more
When occurring 3 times within 100 minutes,
the error code “
F3
” is displayed.
Compressor 62Hz
Less than 2 times within
100 minutes
Compressor upper limit down
1 step/30 seconds
Compressor upper limit up
1 step/20 seconds