Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

Page: 52 / 162

Table 33: Display only fields
Field/LED name Description
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.
Outside Ambient Air
Temperature
Displays Outside Ambient Air Temperature, which is used when the chiller is selectable for
Variable Water Outlet Control.
Capacity Control Output
Devices
Displays the following for each of the devices that is available (drive, VGD, or HGBP):
• 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
variable speed drive or in percent of full open to the VGD or HGBP valve.
• Feedback: Displays the present speed feedback from the variable speed drive 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.
Table 34: Navigation
Button Description
Home Causes and instant return to the Home screen.
Compressor Causes an instant navigation to the Compressor screen.
VSD Causes an instant navigation to the variable speed drive screen.
YVAM Control Center 52