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PIC System Functions
Note:
Throughout this manual, words printed in capital letters and italics are values that may be
viewed on the LID. See Table 2 for examples of LID screens. Point names are listed in
the Description column. An overview of LID operation and menus is given in Figure 13,
Figure 14, Figure 15, Figure 16, Figure 17, Figure 18, and Figure 19.
Capacity Control
The PIC controls the machine capacity by modulating the inlet guide vanes in response to
chilled water temperature changes away from the
CONTROL POINT
. The
CONTROL POINT
may be changed by a CCN network device, or is determined by the PIC adding any active
chilled water reset to the chilled water
SET POINT
. The PIC uses the
PROPORTIONAL INC
(
Increase
)
BAND
,
PROPORTIONAL DEC
(
Decrease
)
BAND
, and the
PROPORTIONAL ECW
(
Entering Chilled Water
)
GAIN
to determine how fast or slow to respond.
CONTROL POINT
may be viewed/overridden on the Status table, Status01 selection.
Entering Chilled Water Control
If this option is enabled, the PIC uses
ENTERING CHILLED WATER
temperature to
modulate the vanes instead of
LEAVING CHILLED WATER
temperature.
ENTERING CHILLED
WATER
control option may be viewed/modified on the Equipment Configuration table, Config
table.