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An unclear operation mode of one of the HVAC cooling towers of Carmel hospital

An unclear operation mode of one of the HVAC cooling towers of Carmel hospital


This video shows the second HVAC cooling tower from the right of the row of 5 cooling towers Carmel hospital have.
During the times I was there, I've detected three operation modes of this cooling tower:
1. Both fan and compressor don't working.
2. Fan operating at low speed. Compressor running very noisy (As in this video).
3. Fan operating at high speed. Compressor running silent.
Both the first and the third mode I understand, but not the second, as not only the moving from the 2nd mode to the 3rd mode and the opposite, isn't performed according the outdoor temperature like many local made household Tadiran A/Cs from the 90's and some Elco and Electra A/C from the beginning of the 2000's (They have both 2-3 external fan speeds): the compressor in this operation mode is much noiser when the fan is at low speed compared to when it at high speed. Also, during power ups and after power interruptions, it always starts at the 2nd mode.
Is there a chance that this is caused simply by the fact that the compressor is operating at idle (Unloaded) when the fan is at low speed, and so it is noiser?

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Album name:dor123 / Off-topic videos
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Date added:May 10, 2016
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merc
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Adam


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May 10, 2016 at 02:35 PM Author: merc
Modern air handling units are quite complex systems. There probably is a PLC controlling inverters that regulate motors in fans and compressors and servos opening/closing dampers to regulate air flow and its cycling.
This way you may encounter many different states of the unit according to current need. The states would probably repeat provided the outdoor conditions and indoor requirements don't change.

Not a misoLEDist...

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