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Control Algorithms Checkout Procedure
In the LID Service menu, one of the tables is Control Algorithm Status. This table contains 4
maintenance tables which may be viewed in order to see how the particular control algorithm is
operating. The 4 tables are:
These maintenance tables are very useful in determining how the control temperature is
calculated, guide vane position, reaction from load changes, control point overrides, hot gas
bypass reaction, surge prevention, etc.
MAINT01
MAINT02
MAINT03
MAINT04
(PSIO Software
Version 09 and
Higher)
OCCDEFM
WSMDEFME
Capacity Control
Override Status
Surge/HGBP
Status
LEAD/LAG
Status
Time Schedules
Status
Water System
Manager Status
This table shows all values that are used to calculate the
chilled water/brine control point.
Details of all chilled water control override values are viewed
here.
The surge and hot gas bypass control algorithm status is
viewed from this screen. All values dealing with this control
are displayed.
This screen indicates LEAD/LAG operation status.
The Local and CCN occupied schedules are displayed here
in a manner that the operator can quickly determine whether
the schedule is in the OCCUPIED mode or not.
The water system manager is a CCN module which can turn
on the chiller and change the chilled water control point. This
screen indicates the status of this system.