York YD Mod D, Руководство по эксплуатации, Страница: 39 / 160

Table 14: Programmable
Button Access level Description
Level setpoint Service
Displays the setpoint to which the refrigerant level is being controlled. Adjustable 20 to
80%; default 50%.
Startup position Service
Sets the starting position of the refrigerant valve to allow the system to match the load
quicker. Adjustable 0 to 100%; default 50%.
Startup delay Admin
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 Admin
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. Adjustable 1 to 5 minutes;
default 1.
Lag start setpoint Service
Sets the refrigerant level setpoint for starting the Lag Compressor to help prevent
starving the evaporator and tripping on low evaporator pressure. Adjustable 10 to
90%; default 20%.
Manual
increment
Service
This sets the percentage the refrigerant valve will manually be driven with each press
of the Open or Close buttons. Adjustable 0.1 to 10%; default 1.0%.
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 Service
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.
High threshold Service
Sets the high limit for the Subcooler Effectiveness Warning. Adjustable 0 to 100%;
default 50%.
Low threshold Service
Sets the low limit for the Subcooler Effectiveness Warning. Adjustable 0 to 100%;
default 50%.
KP Admin Sets the Proportional value of the PID control loop. Adjustable 0.1 to 15; default 1.0.
TI Admin Sets the Integral value of the PID control loop. Adjustable 0.1 to 200; default 100.
TD Admin Sets the Derivative value of the PID control loop. Adjustable 0.0 to 200; default 0.0
Table 15: Navigation
Button Access level Description
Home Service Returns to the Home screen.
Condenser Service Return to the Condenser screen.
39 Model YD Mod D with OptiView Control Center