Unit Enable; Unit Mode Selection - Daikin AGZ070EH Installation, Operation And Maintanance Manual

Unit Enable

Enabling and disabling the chiller is accomplished using
setpoints and inputs to the chiller. The unit switch, remote
switch input, and Unit Enable Set Point all are required to be
'on' for the unit to be enabled when the control source is set to
'local.' The same is true if the control source is set to
Control
Unit
Source
Switch
Set Point
Off
On Local
Network
On Network

Unit Mode Selection

The operating mode of the unit is determined by setpoints 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
Control Source Mode
Set Point Input
Local Off
Local On
Network
Network
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.'
IOM 1206-1
Remote Unit
Switch Enable
Input Set Point Set Point
Off
Off
On On
On On
BAS Available Modes
Request Set Point
Cool
Cool w/Glycol
Cool/Ice w/Glycol
Cool/Ice w/Glycol
Cool Cool/Ice w/Glycol
Ice Cool/Ice w/Glycol
Ice w/Glycol
Test
Unit Controller Operation
'network,' with the additional requirement that the building
automation system (BAS) Enable set point must be 'on'. The
BAS should enable the chiller only when there is a demand for
cooling.
Unit is enabled according to the following table:
BAS
Enable Unit Enable
Off
Off
Off
On
Off Off
On On
and the control source is set to 'local.' The BAS 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:
Unit Mode
Cool
Cool
Cool
Ice
Cool
Ice
Ice
Test
31