MCAC-CTSM-2014-03 DX type water-cooled screw chiller (PCB Control)
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5. Parts control
1). Oil heater control
In unit sand by period, oil heater is energized to keep normal oil temperature. When unit starts, it is
turned off.
Oil heating time limits:
When cooling water inlet temperature >= 35°C (real time value), oil heating time for first startup
is 0.5h. If power down happens during operation and downtime is less than 8hrs, no heating
time delay is needed when unit restarts. If it exceeds 8hrs, 0.5h heating time is need.
When cooling water inlet temperature >= 30°C (real time value), oil heating time for first startup
is 1h. If power down happens during operation and downtime is less than 5hrs, no heating time
delay is needed when unit restarts. If it exceeds 5hrs, 1h heating time is need.
When cooling water inlet temperature >= 25°C (real time value), oil heating time for first startup
is 2hrs. If power down happens during operation and downtime is less than 3hrs, no heating
time delay is needed when unit restarts. If it exceeds 3hrs, 1h heating time is need. If it exceeds
5hrs, 2hrs heating time is need.
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). EXV controller Control
a. EXV controller wiring principle
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