Fig. 12 - Surge Protection Screen - York YT Millennium Operating & Maintenance

OptiView Control Center
FIG. 12
OVERVIEW
(This feature applies to Flash Memory Card version
C.MLM.02.02.xxx and later)
This screen displays a cutaway view of the chiller
compressor and all parameters relating to the Surge
Protection feature. All setpoints relating to this feature
are maintained on this screen.
DISPLAY ONLY
Delta P/P
A parameter that represents the system differential or
"Head pressure". It is calculated as (condenser pressure
– evaporator pressure) / evaporator pressure.
Surge Window Time
When the chiller enters run mode, this value counts
up to the time programmed as the COUNT WINDOW
setpoint. When it reaches the COUNT WINDOW min-
utes, the number of surge events in the oldest minute is
discarded and the number of surge events in the most
recent minute is added, thus providing a rolling count
of the total surge events that have occurred in the last
COUNT WINDOW minutes. This value is reset when
the chiller shuts down.
Surge Window Count
Displays the number of surge events that have oc-
32
SURGE PROTECTION SCREEN
curred in the last 1 to 5 minutes as programmed with
the COUNT WINDOW setpoint. If the chiller has been
running for less than the COUNT WINDOW minutes, it
is the number of surge events that have occurred within
the last number of minutes displayed as the SURGE
WINDOW TIME. The count is cleared when the chiller
shuts down.
Surge Detected (LED)
Illuminates for 5 seconds each time a surge is detected
by the Surge Protection feature. It does not illuminate
in response to surge events detected by the compres-
sor Variable Speed Drive Adaptive Capacity Control
Board.
Total Surge Count
Displays the total number of surge events detected over
the lifetime of the unit (up to a maximum of 65535).
These are the surge events detected by the Surge Protec-
tion feature. The surge events detected by the compressor
Variable Speed Drive Adaptive Capacity Control Board
are not included in this total.
Extended Run Time Remaining
Displays the time remaining in the 10-minute "EX-
TENDED RUN" period. During this period, the Pre-
rotation vanes are driven closed and "Warning – Surge
Protection – Excess Surge Limit" is displayed. Refer to
operation under "Count Limit" below.
FORM 160.55-O1 (920)
00482VIP
YORK INTERNATIONAL