York YK-EP, Operation And Maintenance Manual

Page: 54 / 268

Table 38: Programmable
Button Access level Description
Economizer
Level
Setpoint
Service
Displays the economizer refrigerant level setpoint to tenths of a
percent. (Min 20%, Max 80%, Default 70%)
Economizer
Stopped
Setpoint
Service
Displays the economizer refrigerant stopped level setpoint to tenths
of a percent. (Min 0%, Max 80%, Default 20%)
Startup
Position
Service
Indicates in tenth of a percent the Economizer Level Control Valve
Startup Position setpoint. (Min 0%, Max 100%, Default 50%)
Startup Delay Admin This button displays the startup delay time in seconds.
Ramp Time Admin
Displays the amount of time that it takes for the Economizer to
go from the Stopped Setpoint to the Level Setpoint. The time will
remain the same even if the Stopped setpoint is 10% below the Level
Setpoint.
Change
Setpoints
Admin
This enables a green box to be displayed which can be scrolled
through the 3 Economizer PID gain settings.
Manual
Increment
Service
This oversized button will also contain a text box displaying the
Economizer Level Control Valve Manual Increment for manual
control.
Open Service
Pressing this button will set the Economizer Level Control Valve
Mode to Manual, if it had been in Auto. It will increase the current
Economizer Level Control Valve Command by an amount equal to
the Manual Increment, with a maximum of 100.0%.
Close Service
Pressing this button will set the Economizer Level Control Valve
Mode to Manual, if it had been in Auto.It will decrease the current
Economizer Level Control Valve Command by an amount equal to
the Manual Increment, with a minimum of 0.0%.
Set Service
Pressing this button will open a dialog box where the user can
manually enter a valve command. Once a value has been entered
and the Enter key pressed, the Economizer Level Control Valve Mode
shall be set to Manual, if it had been in Auto and the Economizer
Level Control Valve Command shall be set to the entered value.
Auto Service
Pressing this button will set the Economizer Level Control Valve
Mode to Auto Control. This button will only be available and active
when the Economizer Level Control Valve Mode is Manual
Table 39: Navigation
Button Access level Description
Home View Returns user to HOME Screen.
Economizer
Compressor View
Returns User to Economizer Screen.
YK-EP Style B Centrifugal Chiller 54