York YK-EP B Operation & Maintenance Manual page 78

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
PROGRAMMABLE
Level Setpoint
Access Level Required: SERVICE
Displays the Condenser Level Control Setpoint for the
PID control. The value will display in tenths. (Adjust-
able form 20 to 80%; default 50%).
Startup Position
Access Level Required: SERVICE
Displays the Startup Position programming button.
This button will also contain a text box displaying the
Condenser Level Control Valve Startup Position. The
value will display in tenths. (Adjustable 0 to 100%; de-
fault 50%).
Startup Delay
Access Level Required: 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. (Can be adjusted at 15
seconds.)
Ramp Time
Access Level Required: 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 ap-
plied to the Level Setpoint. This ramp allows the level
to go from the present level to the programmed Lev-
el Setpoint over a period of time programmed as the
Ramp Up Time. (1 to 5 minutes; default 1 min).
High Threshold
Access Level Required: SERVICE
Sets the high limit for the Subcooler Effectiveness
Warning (Adjustable 0 to 100%; default 50%).
Low Threshold
Access Level Required: SERVICE
Sets the low limit for the Subcooler Effectiveness
Warning (Adjustable 0 to 100%; default 50%).
Kp
Access Level Required: ADMIN
Sets the Proportional value of the PID control loop.
(Adjustable 0.1 to 15; default 0.5).
Ti
Access Level Required: ADMIN
Sets the Integral value of the PID control loop. (Ad-
justable 0.1 to 500; default 200).
78
Td
Access Level Required: ADMIN
Sets the Derivative value of the PID control loop. (Ad-
justable 0.0 to 200; default 0.0).
Manual Increment
Access Level Required: SERVICE
This sets the percentage the refrigerant valve will man-
ually be driven with each press of the Open or Close
buttons. (0.1 to 10%; default 1.0%).
Open
Pressing this button will set the Condenser Level Con-
trol 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 In-
crement, with a maximum of 100.0%.
C
lose
Pressing this button will set the Condenser Level Con-
trol 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 In-
crement, with a minimum limit of 0.0%.
Set
Access Level Required: SERVICE
Pressing this button will open a dialog box where the
user can manually enter a valve command. Once a legiti-
mate value has been entered and the Enter key pressed,
the Condenser Level Control Valve Mode will be set to
Manual, if it had been in Auto and the Condenser Level
Control Valve Command will be set to the entered value.
Auto
Access Level Required: SERVICE
This button is only displayed when in Manual Level
Control. Pressing this button returns the control to the
PID program.
Change Setpoints
This button is only displayed when signed in at Service
Level. Pressing this button allows the user to select any
of the setpoint parameters using the arrow keys.
NAVIGATION
Home
Access Level Required: VIEW
Returns the user to the HOME Screen.
Condenser
Access Level Required: SERVICE
Returns the user to the CONDENSER Screen.
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
JOHNSON CONTROLS