Functional Control ESIE10-01
2–26 Part 2 – Functional Description
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2.2.2 Unit Mode Selection
The operating mode of the unit is determined by set points and inputs to the chiller. The Available
Modes Set Point determines what modes of operation can be used. This set point also determines
whether the unit is configured for glycol use. The Control Source Set Point determines where a
command to change modes will come from. A digital input switches between cool mode and ice mode
if they are available and the control source is set to 'local'. The BMS mode request switches between
cool mode and ice mode if they are both available and the control source is set to 'network'.
The Available Modes Set Point should only be changeable when the unit switch is off. This is to avoid
changing modes of operation inadvertently while the chiller is running.
Unit Mode is set according to the following table.
Note: An "x" indicates that the value is ignored.
Glycol
Configuration
If the Available Modes Set Point is set to an option ‘w/Glycol’, then glycol operation should be enabled
for the unit. Glycol operation should only be disabled when the Available Modes Set Point is set to
‘Cool’.
Control Source
Set Point
Mode Cool/Ice
Input
BMS Cool/Ice
Request
Available Modes
Set Point
Unit Mode
xxxCoolCool
x x x Cool w/Glycol Cool
Local Off x Cool/Ice w/Glycol Cool
Local On x Cool/Ice w/Glycol Ice
Network x Cool Cool/Ice w/Glycol Cool
Network x Ice Cool/Ice w/Glycol Ice
x x x Ice w/Glycol Ice
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