Flooded type water cooled screw chiller (PCB Control)
37
When cooling water inlet temperature >= 20°C (real time value), oil heating time for first startup
is 4hrs. If power down happens during operation and downtime is less than 1hrs, no heating
time delay is needed when unit restarts. If it exceeds 1hrs, 2h heating time is need. If it exceeds
5hrs, 3hrs heating time is need. If it exceeds 8hrs, 4hrs heating time is need.
When cooling water inlet temperature < 20°C (real time value), oil heating time for first startup is
8hrs. If power down happens during operation and downtime is less than 1hrs, no heating time
delay is needed when unit restarts. If it exceeds 1hrs, 3h heating time is need. If it exceeds 5hrs,
5hrs heating time is need. If it exceeds 8hrs, 8hrs heating time is need.
2). Pressure sensor Control
high pressure control
3). Discharge temp. Control
4). Return oil solenoid valve Control
High pressure
13Bar
12Bar
stop
Normal adjusting
>50% unloading
50%
Discharge temp.
80
℃
12Bar
stop
on
45
℃
12Bar
10min
12Bar
stop
25%
off
12Bar
50%
25%
on
12Bar
2min
12Bar
2min
12Bar
3min
12Bar
50%
compressor
SV
on
12Bar
