Control Algorithms Checkout Procedure

In the LID Service menu, one of the tables is Control Al gor it hm Status. This table c on tains 4

maintenance tables which may be v iewed in order to see how the part icular control al gorithm is

operating. The 4 tables ar e:

These maintenance tabl es are very useful in de te rmining how the control t em pe rature is

calculated, guide va ne po sition, reaction fr om loa d changes, control poin t overrides, hot gas

bypass reaction , surge prevent ion, 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 val ues that are used to calcu late the
chilled water/brine con trol point.
Details of all chilled water cont rol override values are viewe d
here.
The surge and hot gas bypa ss control algorithm sta tus is
viewed from this scree n. All values dealing with th is control
are displayed.
This screen indicates LEAD/LAG operation status.
The Local and CCN occupied schedules are displayed here
in a manner that the operato r can quickly determine whether
the schedule is in the OCCUPIED mode or not.
The water system manager is a CCN module which can tu rn
on the chiller and change the chilled water control point. This
screen indicates the status of this system.