Refrigerant Level Control Screen - Johnson Controls YORK OM Titan Operating Instructions Manual

FORM 160.72-O1 (810)

refrigeranT level ConTrol sCreen

figure 6 - REFRIGERANT LEVEL CONTROL SCREEN
overvieW
This screen displays a cutaway view of the refriger-
ant level control valve. All setpoints relating to the re-
frigerant level control are maintained on this screen.
Through animation, the level control valve position
is displayed. In addition, the refrigerant flow control
valve can be manually operated.
displaY onlY
level Control valve position (Cv)
Displays the current liquid control valve position
subcooler refrigerant level (pv)
Displays the current refrigerant level
level Control valve setpoint (sp)
Displays the current liquid control valve setpoint
ramp Time remaining (rr)
Displays countdown ramp time that is applied to the
level control valve. The ramp time will begin counting
at the end of the "Pulldown Time Remaining". During
the ramp time the level control valve will move from
its start position to control position.
JOHNSON CONTROLS
Zone state
Displays the state of control applied to level control
valve. Zone-1 / Zone-2 / Idle / Pulldown / Zone-2 to
Zone-1 / Manual. There are two PID calculations that
are set up on the PID Tuning Screen.
Zone-1 - Operates when the difference between the
Subcooler Refrigerant Level and Refrigerant Control
Valve Setpoint is less than the "Zone Transition Delta".
Zone-2 - Operates when the difference between the
Subcooler Refrigerant Level and Refrigerant Control
Valve Setpoint is greater than the "Zone Transition
Delta".
Idle - When the chiller is not running.
Pulldown - When the Level Control Valve is being
held at its startup position.
Zone-2 to Zone-1 - When the PID is transitioning from
Zone-2 to Zone-1 while delayed by the "Zone Transi-
tion Time" delay.
Manual - When the Level Control Valve is in manual
control position.
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