Capacity control setpoints screen
Figure 35: Capacity control setpoints screen
This screen shows Service-level setpoints related to the Capacity Control logic.
Table 36: Display only fields
Field/LED name
Description
Gear Ratio
Active Gear Ratio
Impeller Diameter
Active Impeller Diameter
Values for the installed gear and impeller based upon the model number in the Sales
Order Screen.
Programmable - Change setpoints
Pressing the Change setpoints keys allows the user to change any of the setpoints in the following
table. However, these setpoints should never be changed unless directed to do so by Product
Technical Support. Access level required is SERVICE.
Table 37: Programmable change setpoints
Button
Description
LCHLT Setpoint Ramp Rate
Adjustable 0.1°F/S to 2.0°F/S, Default: 0.1°F/S. When the chiller starts, the LCHLT
Setpoint is ramped from the LCHLT to the Active LCHLT Setpoint at the Ramp Rate to
prevent control windup and overshoot.
LCHLT Setpoint Start Offset
Adjustable 0.0 to 10°F, Default 5.0°F. When the chiller is off, the Active LCHLT Setpoint
is calculated as the LCHLT - LCHLT Setpoint Start Offset. This is the starting setpoint
that the Capacity Control will ramp from to the desired setpoint.
Discharge Superheat Limit Offset
Adjustable -5.0°F (diff) to 5.0°F (diff), Default: 0.0°F (diff).
Carryover Current Limit Offset
Adjustable -10.0% to +10.0%, Default 0.0°%
Capacity Control Gain
Adjustable Low, Medium, High, Default: Medium
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Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
