JOHNSON CONTROLS
43
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
3
DISPLAY ONLY FIELDS
FIELD/LED NAME
DESCRIPTION
Active LCHLT Setpoint
Displays the active temperature setpoint to which the chiller is set to control liq-
uid leaving the evaporator. The Active Setpoint is a target to the Local, Remote
or BAS (ISN) LCHLT programmed setpoint, depending on the control source
selected. When the chiller is not running, the Active Setpoint is set to Entering
Chilled Liquid Temperature - LCHLT Setpoint Start Offset When the VSD starts,
the Active LCHLT Setpoint is ramped to the programmed LCHLT Setpoint at
the programmable LCHLT Setpoint Ramp Rate. When the chiller is running,
performing capacity control, any change to the programmed LCHLT setpoint
results in a ramp from the old Active Setpoint value to the new LCHLT setpoint
value at the programmed LCHLT Setpoint Ramp Rate.
Delta T
Displays the difference between the temperature of the chilled liquid leaving the
evaporator and the Leaving Chilled Liquid Active Setpoint.
Control State
Displays the present source controlling the command to the capacity control
devices, based on conditions as follows:
• Inactive – Capacity Control is not active
• Temperature Control – Capacity Control is active with no overrides acting
• Input Current – Input Current Override is in control
• Motor Current – Motor Current Override is in control
• Condenser Pressure – Condenser Pressure Override is in control
• Evaporator Pressure – Evaporator Pressure Override is in control
• Low LCHLT – LCHLT low temperature Override is in control
Load Limit
Displays if any load limiting control is acting on the temperature control output
to the capacity control devices. The field indicates the following:
• Inactive – Capacity Control is not active
• None – No limit is in effect
• Input Current
• Motor Current
• Condenser Pressure
• Evaporator Pressure
Head Pressure
Displays the difference between condenser refrigerant pressure and evaporator
refrigerant pressure.
Entering Condenser Liquid Tempera-
ture
Displays the temperature of the condenser liquid entering the condenser.
VGD Position
Displays the Position of the VGD actuator.
Capacity Control Output Devices
Displays the following for each of the devices that is available: VSD (Variable
Speed Drive), VGD (Variable Geometry Diffuser) or HGBP (Hot Gas Bypass
Valve)
• Active Output (LED): Indicates which device is currently selected by the
control for manipulation.
• Command: Displays the output command from the control to the device in
Hertz to the VSD or in percent of full open to the VGD or HGBP valve.
• Feedback: Displays the present speed feedback from the VSD or present
position feedback from the VGD.
• Control Mode: Displays whether the device is under Automatic or Manual
control.
• Active Min: Displays the prevailing minimum value to which the control to the
device is limited, based upon surge controls or operating limits.
• Control State: Displays whether the device is under Automatic or Manual
control.
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