Capacity control screen
Figure 34: Capacity control screen
This screen applies to all types of chiller drives. Some of the fields will not be visible depending
upon what capabilities, drive and mode of operation the unit is in. This screen allows Manual/Auto
control of the VSD, PRV and Hot Gas Bypass if logged in at the Service access level. This screen also
serves as a gateway to subscreens.
Table 33: Display only fields
Field/LED name
Description
Override Control:
Evaporator Pressure
Displays the pressure in the evaporator.
[Evaporator Pressure] Override
Threshold
Displays the evaporator pressure setpoint below which the low evaporator pressure
capacity control override takes effect.
Condenser Pressure
Displays the pressure in the condenser.
[Condenser Pressure] Override
Threshold
Displays the condenser pressure setpoint above which the high condenser pressure
capacity control override takes effect.
Adjusted Superheat
Displays the superheat temperature.
[Adjusted Superheat] Override
Threshold
Displays the superheat setpoint below which the low superheat capacity control
override takes effect to prevent slugging the compressor with liquid.
Motor Current % FLA
Displays the percentage of maximum motor current delivered to the motor,
determined from the highest of the three phase Motor Currents/Maximum Motor
Current Limit.
Override Threshold
Displays the active input current percent limit, which is the minimum of Local Input
Current Limit, Remote Input Current Limit, and Pulldown Current Limit or BAS current
limit.
Temperature Control:
[Evaporator] Entering Liquid
Displays the temperature of the chilled liquid as it enters the evaporator.
[Evaporator] Leaving Liquid
Displays the temperature of the chilled liquid as it leaves the evaporator.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
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