Frick QUANTUM LX - Page 43

QUANTUM™ LX EVAPORATOR CONTROL PANEL
OPERATION
090.610-O (MAR 2016)
Page 43
• Off - If Reheat has been enabled, and the tem-
perature rises above this value, then the Reheat
valve will be closed.
Fan
Digital Control
• On - If the control temperature reading
equals or exceeds this setpoint, the fan out-
put will be energized or turned on to run the
fan.
• Off - If the control temperature is less than
or equal to this setpoint, the fan high-speed
output will be de-energized or turned off to
stop the fan.
Analog Control
• Setpoint – The value that the unit will at-
tempt to maintain temperature to.
• Proportional Band – The temperature
range over which the PID control will be
managing fan operation (provided Integra-
tion Time is not set to zero, in which case it
will be strictly proportional). If the Setpoint
is 40 degrees and the Proportional Band is
2 degrees, the PI control will set the output
to Fan Min if the temperature is below 40
degrees (Setpoint). When the temperature
is between 40 and 42 degrees (Setpoint plus
Proportional Band) the PI control will be
increasing the output in a manner to bring
the liquid temperature toward the setpoint).
Above 42 degrees the output will be set to
Fan Max.
• Integration Time – This setpoint controls
the inuence that the Integral component
exerts on the PID Output value. The Integral
component works to push the Control Input
toward the Control Setpoint by tracking the
difference between the Control Input and
the Control Setpoint over time.
• Maximum – This is the maximum percent of
the analog output signal.
• Minimum – This is the minimum percent of
the analog output signal.