10
of 53
Control strategy
1
、
、
、
、
Internal DC fan:
The fan is always running at full speed once the 48VDC supplied (Active and Emergency Cooling
Mode)
2
、
、
、
、
External AC fan:
The external fan starts together with the compressor, at the compressor set point (default is 35
℃
).
When the compressor is on, the external AC fan will run at low speed. The external AC fan will stop
when the compressor stops.
When the condenser temperature reaches 50
℃
, the external AC fan will run at medium speed. If
temperature drops 3
℃
(47
℃
), the speed returns to low.
When the condenser temperature reached 60
℃
, the external AC fan will run at full speed. If
temperature drops 3
℃
(57
℃
), the speed returns to medium.
3
、
、
、
、
Compressor:
When the return air temperature reaches the compressor set point (default is 35
℃
),the compressor
starts.
When the compressor starts, it will always run for at least last 9 minutes
in 9 minutes,If the return air is 10
℃
below the compressor set point, the compressor will stop.
After 9 minutes, If the return air is 5
℃
below the compressor set point, the compressor will stop.
When the compressor stops, it will always wait for at least 8 minutes before it can restart.
If the compressor has a failure (e.g. HP/LP alarm or overheat protection, then it will wait 30 minutes
before it can restart.
10
℃
drops
Summary of Contents for DCU22-2000DH
Page 51: ...51 of 53 12 Appendix Dimension...
Page 52: ...52 of 53 Wiring diagram...
