Table 28: Programmable
Field/LED name
Description
Level Setpoint
Displays the setpoint to which the refrigerant level is being controlled. (Adjustable 20
to 80%; default 50% requires Service Password).
Startup Position
Sets the starting position of the refrigerant valve to allow the system to match the load
quicker. (Adjustable 0 to 100%; default 50% requires Service password).
Startup Delay
The amount of time the refrigerant level valve PID waits after start before it starts
controlling the valve position. This allows the system to stabilize before making valve
position changes (Set at 15 seconds but is adjustable with an Admin password).
Ramp Time
After the chiller has been running for the level control startup delay time, if the
refrigerant level is less than the Level Setpoint, a linearly increasing ramp is applied
to the Level Setpoint. This ramp allows the level to go from the present level to the
programmed Level Setpoint over a period of time programmed as the Ramp Up Time.
This setpoint can only be changed with Admin level access (1 to 5 minutes; default 1).
Manual Increment
This sets the percentage the refrigerant valve will manually be driven with each press
of the Open or Close buttons (0.1 to 10%; default 1.0%, requires Service password).
Open
Pressing this button will set the Condenser Level Control Valve Mode to Manual
if it had been in Auto and will increase the current Condenser Level Control Valve
Command by an amount equal to the Manual Increment, with a maximum of 100.0%.
Close
Pressing this button will set the Condenser Level Control Valve Mode to Manual if
it had been in Auto and will decrease the current Condenser Level Control Valve
Command by an amount equal to the Manual Increment, with a minimum of 0.0%.
Set
Pressing this button will open a dialog box where the user can manually enter a valve
command. Once a legitimate value has been entered and the Enter key pressed, the
Condenser Level Control Valve Mode shall be set to Manual if it had been in Auto
and the Condenser Level Control Valve Command shall be set to the entered value.
(Adjustable 0.0% to 100.0%; default 50.0% Requires Service password)
High Threshold
Sets the high limit for the Subcooler Effectiveness Warning (Adjustable 0 to 100%;
default 50% requires Admin password).
Low Threshold
Sets the low limit for the Subcooler Effectiveness Warning (Adjustable 0 to 100%;
default 50% requires Admin password).
KP
Sets the Proportional value of the PID control loop. (Adjustable 0.1 to 15; default 1.0
requires Admin password).
Ti
Sets the Integral value of the PID control loop. (Adjustable 0.1 to 200; default 100
requires Admin password).
Td
Sets the Derivative value of the PID control loop. (Adjustable 0.0 to 200; default 0.0
requires Admin password).
Table 29: Navigation
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Home
View
View
Returns the user to Home screen.
Condenser
View
View
Returns the user to Condenser screen.
49
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
