Dx/Chiller Control - Johnson Controls FRICK QUANTUM HD Operation

090.040-O (MAR 12)
Page 70
ACCESSING:
DESCRIPTION: Use this screen to set the operational
characteristics of the Dx / Chiiller system.
DX CIRCUIT CONTROL
DX Circuit A - The following are digital outputs:
• Disabled – DX Circuit A is off.
• DX Circuit On with compressor – DX
Circuit A is on if the compressor is on,
or it is off if the compressor is off.
• DX Circuit On by Capacity Position -
When this option is selected, two other
setpoints are shown:
•
•
DX Circuit A is turned On when the Ca-
pacity Position is above the On When
Above setpoint, and it is turned Off
when the Capacity Position is below the
Off When Below setpoint.
DX Circuit B - The following are digital outputs:
• Disabled – DX Circuit B is off.
• DX Circuit On with compressor – DX-
QUANTUM™ HD COMPRESSOR CONTROL PANEL
CONFIGURATION
Package - Dx / Chiller Control
Off When Below.
On When Above.
OPERATION
Package
•
PUMP DOWN CONTROL
With this option enabled, Pump Down provides
for pumping down the refrigerant (removal of
the refrigerant gas). For example, this can be
used for removing the refrigerant from a shell
and tube heat exchanger to prevent its stand-
ing water from freezing. When Pump Down is
enabled and the compressor is stopped the DX
circuits digital outputs are de-energized but the
compressor remains running for the delay pe-
riod. When the delay period times out, or the
Suction Pressure falls below the On When Suc-
tion Above setpoint, the compressor is turned

DX/Chiller Control

Circuit B is on if the compressor is on,
or it is off if the compressor is off.
DX Circuit On by Capacity Position -
When this option is selected, two other
setpoints are shown:
• Off When Below.
• On When Above.
DX Circuit B is turned On when the Ca-
pacity Position is above the On When
Above setpoint, and it is turned Off
when the Capacity Position is below
the Off When Below setpoint.