Daikin EWWQ-AJYNN, Руководство по обслуживанию

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ESIE07-05 Functional Control
Part 2 – Functional Description 2–53
3
2
4
5
1
Other settings ■ Start up
∆
T : 2.7°C
■ Shutdown
∆
T : 1.7°C
■ Regulation band : 3°C
EXAMPLE: Upload
1)
■ If the water temperature is above 9.7°C the chiller can start (below 9.7°C the chiller will wait)
■ Unit will start leader compressor
2)
■ Unit will load leader compressor till 75%
3)
■ If temperature is in Regulation Band
Æ
wait interstage time (default 210 sec)
■ If temperature is approaching setpoint (after interstage time)
Æ
wait (no need to start new compressors because chilled water temperature is decreasing,
prevent undershoot)
■
After interstage time check if temperature is in unloading band
4a)
No: Unit will add next compressor (25% capacity) and keep the leader compressor at 75%
Leader comp : 75%
Next comp : 25%
4b)
Yes: Unit will first unload leader compressor to 50%, when this is done the next compressor
will start (25%)
Leader comp : 50%
Next comp : 25%
This will give you again 75% capacity but now the unit is able to upload in small steps.
■ Unit will upload the running compressors to 75%
■ If another compressor is present and there is still demand for load, the regulation cycle will
continue from point 3.
■ If no other compressors are present and there is still demand for load, the compressors will
upload to 100% capacity according to the PID regulation (if needed).
■ When the temperature is in the dead band, the unit will operate with the same capacity (no upload
or download)
ESIE07-05.book Page 53 Friday, December 21, 2007 3:21 PM