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Timing
Independently from the type of adjustment used (Load or
Temperature), delays and switch-on/switch-off filters are envisioned.
This is to prevent sudden temperature changes and allow the chillers
to switch-on, activate the compressors and stabilise themselves before
carrying out other switch-ons, or on switch-off wait for the chillers to
go to constant power before switching the others off.
Delay filter for request demand condition is the filter that the switch-
on and switch-off conditions must exceed to be considered such
E.g. load adjustment supposing that the % parameter Load to start
next= 50
Delay filter for request demand condition= 60
Means that the percentage of power of the % LOAD must remain
above 50% for at least 60 sec. before being recognised as such.
Temperature adjustment
Leaving water temp. start chiller = 5.2°C
Delay filter for request demand condition= 60
Means that the SUW temperature must remain above 5.2°C for at
least 60 sec. before being recognised as such.
Delay between start next chiller is the minimum delay time between
the switch-on of one chiller and the other
Delay between stop next chiller is the minimum delay time between
the switch-off of one chiller and the other
Tempo
Tempo
Delay filter for request demand condition
Delay between stop next chiller
Conditions for switching off active chiller •
OFF chiller
• OFF chiller •
Delay between stop next chiller
Delay filter for request demand condition
Conditions for switching off active chiller •
Tempo
Tempo
OFF chiller
• OFF chiller •
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