York YK Style H Operation Manual page 40

Table 18: Display only fields
Field/LED name
Entering Heating Condenser Liquid
Temperature
Leaving Heating Condenser Liquid
Temperature
Active Hot Water Setpoint
Entering Condenser Liquid
Temperature
Leaving Condenser Liquid
Temperature
Head Pressure
Head Pressure Setpoint
Heating Condenser Liquid Flow
Switch (LED)
Condenser Liquid Flow Switch (LED)
PID Control Mode
Control Valve Output
Control Valve Control Mode
Note: Normally, the control valve performs hot water control unless certain operating
conditions cause it to switch over to head pressure control. When performing hot water
control, Hot Water is displayed. When performing head pressure control, Head Pressure is
displayed. There are also conditions under which it is not controlling either one, in which case
Inactive is displayed. The feature that controls the valve at any given time and when it is
inactive is determined by operating conditions as shown in the flowchart in the Heat Recovery
Section in OptiView Control Center – Service Instructions (Form 160.76-M1).
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Description
Displays the temperature of the liquid as it enters the heating condenser tube bundle.
Displays the temperature of the liquid as it leaves the heating condenser tube bundle.
Displays the Hot Water Setpoint to which the Leaving Heating Condenser Liquid
Temperature is being controlled. Only appears when Hot Water Control is enabled.
Displays the temperature of the liquid as it enters the standard condenser tube
bundle.
Displays the temperature of the liquid as it leaves the standard condenser tube
bundle.
Displays the pressure difference between the condenser and evaporator (condenser
minus evaporator). This is also called the Head Pressure. Only appears when Head
Pressure Control is enabled.
Displays the active Head Pressure Setpoint to which the head pressure is being
controlled. Only appears when Head Pressure Control is enabled.
Displays the status of the flow switch in the heating condenser tube bundle.
Illuminates when liquid flow is present. Otherwise, it is extinguished.
Displays the status of the flow switch in the standard condenser tube bundle.
Illuminates when liquid flow is present. Otherwise, it is extinguished.
Only appears when Hot Water Control is enabled. Displays the function the Control
Valve is controlling. If the chiller is equipped with both Heat Recovery and Head
Pressure Control and both are enabled, there is not a control valve for each feature.
Rather, there is one common valve that is either performing Hot Water Control for
Heat Recovery or it is performing Head Pressure Control. It will not be performing
control for both features at the same time. See the following note.
Displays the position command being sent to the control valve. If Hot Water Control
is enabled and there is flow in the Heating Condenser, the valve is performing Heat
Recovery Control. Otherwise, if Head Pressure Control is enabled, it is performing
Head Pressure Control. Displayed over the range of 0.0% to 100%. The actual value
of the output signal for a given error depends on whether the PID Output Setpoint is
set to direct or reverse. If set to direct, the 0.0% output will be at minimum; the 100%
output will be at maximum. If set to reverse, the 0.0% output will be at maximum; the
100% output will be at minimum. Only appears when Hot Water Control is enabled or
Head Pressure Control is enabled.
Displays whether the Control Valve is in automatic or manual control. Only appears
when Hot Water Control is enabled or Head Pressure Control is enabled.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center