Johnson Controls YORK YK MaxE, Operation Manual

Page: 85 / 184

FORM 160.54-O1
85
JOHNSON CONTROLS
prograMMaBLe
Local Motor Current Limit
Allows the user to specify the maximum allowed mo-
tor current (as a percentage of FLA). When the motor
current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the specified pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
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.
Surge Sensitivity
Allows the user to define the surge detection sensitivity
of the ACC surge detection. Service Technicians refer
to YORK VSD manual 160.00-M4.
Surge Margin Adjust
When the ACC maps a surge point, it will begin to
adjust the chiller command frequency and vane con-
trols at a certain “margin” from the mapped point. This
programmable value allows the service technician to
modify 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 conditions. Mapping a point at
these conditions will cause the ACC to make adjust-
ments to the command frequency in the future in order
to prevent the chiller from operating at the conditions
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
parameters 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 confirmation of
its selection by entry of a special password. USE WItH
CAUtIoN.
NaVigatioN
Home
Access Level Required : VIEW
Causes an instant return to the Home Screen.
VSD
Access Level Required
: VIEW
Returns to the VSD Screen.
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