Function
4-16 l Operati on
Control Function Descriptions(continued)
Screen
SCREEN 21A (Aftercooler or
Precooler Flow Control Option)
SCREEN 21B (Aftercooler Flow
Control Option)
SCREEN 21C Precooler
(Disable/Enable)
SCREEN 21 D (Precooler Flow
Control Option)
SCREEN 22 (Current Monitor
Option)
This screen shows if the aftercooler or pre-
cooler flow control option is enabled. If it
is disabled, there will be no setpoint for
the Return Air Temperature, screen 5. The
aftercooler flow control option must be
installed (see screen 75) for this to appear.
This screen shows if the control is opening
the solenoid valve. The aftercooler flow
control option must be installed (see
screen 75) for this to appear.
This screen shows the disable/enable
function of the Precooler. The Precooler
display will read Disabled when not acti-
vated. The Precooler Flow Control must be
installed (see screen 75) for this to appear.
This screen shows if the control is opening
the precooler flow control solenoid valve.
The Precooler Flow Control option must
be installed (see screen 75) for this to
appear.
This screen shows the measured current on
each leg of the 3-phase power going to the
process heater. The Current Monitor
option (see screen 75) needs to be installed
for this screen to appear.
AFTERCOOLER
ENABLED
PRECOOLER
FLOW ON
PROCESS CURRENTS
84.3 A 84.2 A 84.3 A
AFTERCOOLER
FLOW ON
PRECOOLER
ENABLE
CAUTION: The precooler must not be
installed in the process line for tem-
perature setpoints above 150°F
{66°C}. The precooler housing will
absorb too much heat and will result
in poor process temperature control.
NOTE: Screens labeled 75 in
the display screen flow chart
on page 4-9 are various
option installation screens.
✐
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