York YK Style H Operation Manual page 46

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Level Control Valve Command
Indicates the valve command as a percentage of full
open. It is only displayed when the valve control meth-
od is analog.
PROGRAMMABLE
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 al-
low 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 con-
trol 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 man-
ually 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 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%.
46
Close
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 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. (Requires Service password)
High Threshold
Sets the high limit for the Subcooler Effectiveness
Warning (Adjustable 0 to 100%; default 50% requires
Service password)
Low Threshold
Sets the low limit for the Subcooler Effectiveness
Warning (Adjustable 0 to 100%; default 50% requires
Service password)
KP
Sets the Proportional value of the PID control loop.
(Adjustable 0.1 to 15; default 1.0 requires Admin pass-
word)
Ti
Sets the Integral value of the PID control loop. (Adjust-
able 0.1 to 200; default 100 requires Admin password)
Td
Sets the Derivative value of the PID control loop. (Ad-
justable 0.0 to 200; default 0.0 requires Admin pass-
word)
NAVIGATION
Home
Access Level Required: VIEW
Returns user to HOME Screen.
Condenser
Access Level Required: VIEW
Returns user to CONDENSER Screen.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs