FORM 160.55-O1 (604)
53
YORK INTERNATIONAL
Pulldown Demand Limit
Allows the user to specify the current limit val ue (as a
percentage of FLA) to which the chiller will be limited
during the speci
Þ
ed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy sav ings
following chiller start-up.
Pulldown Demand Time
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.
Stability Limit
Adjusting this value modi
Þ
es the pre-rotation vane con-
trol algorithm when used in conjunction with an ACC.
Surge Margin Adjust
When the ACC maps a surge point, it will begin to
ad just the chiller command frequency and vane con-
trols at a certain “margin” from the mapped point. This
pro gram ma ble value allows the service technician to
mod i fy the “margin” at which these adjustments will
begin to take place.
Manual Surge Point
This key will force the ACC to map a surge detection
at the present operating con di tions. Mapping a point at
these conditions will cause the ACC to make ad just -
ments to the command frequency in the future in order
to pre vent the chiller from operating at the con di tions
mapped.
USE WITH CAUTION.
ACC Auto Map Print (Enabled / Disabled)
The chiller monitors the ACC communications and
when a surge point is mapped, a short report of system
pa ram e ters is printed.
When this function is active, all
other printing capability is disabled
.
ACC Map Report
The chiller requests the entire surge map from the ACC.
As the map is received, the parameters for each point
are printed.
Surge Map Clear
This key instructs the ACC to clear all of the surge points
presently mapped. This key will require con
Þ
r ma tion of
its selection by entry of a special pass word.
USE WITH
CAUTION.
NAVIGATION
Home
Access Level Re quired
: VIEW
Causes an instant return to the Home Screen.
VSD
Access Level Required
: VIEW
Returns to the VSD Screen.
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