Table 35: Display only fields
Field/LED name Description
Leaving Chilled Liquid Displays the temperature of the chilled liquid as it leaves the evaporator.
Active LCHLT Setpoint
Displays the active temperature setpoint to which the chiller is set to
control liquid 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
61
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