York YK-EP Operation And Maintenance Manual page 86

Table 74: Display only
Field/LED name
Leaving Chilled Liquid
Temperature
Delta T
Control State
Load Limit
Anti-Surge Limit LED
Economizer Head Pressure
Active Output LED
PRV Command
PRV Feedback
Control Mode
Table 75: Programmable
Button Access level
Manual
Service
Increment
Increase Service
Auto Service
86
Description
Displays the leaving chilled liquid temperature at the evaporator
and the condenser.
Displays the temperature that is the result of the Leaving Chilled
Liquid Temperature minus the Leaving Chilled Liquid Temperature
Active Setpoint.
Displays the control state that the economizer is operating. It could
show Inactive, Cooling Control, or Motor Current, depending on the
panels Capacity Control State.
Displays the Active Load Limit. The following messages could be
displayed: Inactive, None, or Motor Current.
LED is ON when the Economizer Operation Mode is Economizing
Anti Surge or Boost Anti Surge. LED is off otherwise.
Displays the economizer head pressure in tenths.
LED on the panel lights to indicate Pre-Rotation Vanes are active.
Displays the position the Pre-Rotation Vanes are commanded to
open.
Displays the feedback data used to calculate the position of the Pre-
Rotation Vanes.
Shows what state the economizer Pre-Rotation Vane state. It may
display Manual, Auto, or Inactive, depending on what is happening
with the economizer.
Description
Sets the amount the PRV position signal will Increase or Decrease
when one of those manual control buttons are pressed. (Range is
adjustable from 0.1% to 10%, Default = 10%).
Pressing this button with activate the economizer Pre-Rotation
Vane override and set it to Manual, if it was previously in Auto. It
will increase the Pre-Rotation Vane override position by an amount
equal to the Manual Increment.
Pressing this button will set the economizer capacity control to
Auto. This button will only be shown when the economizer capacity
control is Manual.
YK-EP Style B Centrifugal Chiller