QUANTUM™ LX EVAPORATOR CONTROL PANEL
OPERATION
090.610-O (MAR 2016)
Page 44
SETPOINTS – Heating (Mode 1)
DESCRIPTION: This screen allows for the setup of the Mode 1
Heating. There is also Mode 2, 3 and 4 Heating Modes.
Heating (using hot gas as the heat source) is sometimes used
to raise the temperature within an area of a plant such as a
loading dock. The process of heating initiates with the Pre-heat
stage. Pre-heat is used to properly prepare for heating. Pre-
heat can consist of three steps: Pump Out, Soft Hot Gas, and
Fan Delay. Then Hot Gas heating operates by opening the Hot
Gas valve when the temperature falls below the On setpoint,
and turns the valve off when the temperature exceeds the Off
setpoint. This process continues until it becomes necessary
to terminate heating. Post-heat stage is used to properly exit
from heating. Post-heat can consist of two steps: Bleed, and
Fan Delay. Each step has an operator adjustable time setpoint.
This screen provides setpoint boxes to allow for the congura-
tion of Heating Mode 1:
Hot Gas
• On - If the control temperature is less than this
setpoint, the output for the Hot Gas solenoid
valve will be energized to provide heating.
• Off - If the control temperature equals or ex-
ceeds this setpoint, the output for the Hot Gas
solenoid valve will be de-energized to cancel
heating.
Fan
Digital Control
• On - If the control temperature is less than
this setpoint, the output for the Fan will be
energized.
• Off - If the control temperature equals or
exceeds this setpoint, the output for the Fan
will be de-energized
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 25 degrees and the Proportional Band is
2 degrees, the PI control will set the output
to Fan Min if the temperature is below 23
degrees (Setpoint minus Proportional Band).
When the temperature is between 23 and
25 degrees, the PI control will be decreas-
ing the output towards the Fan Min value.
When the temperature is between 25 and 27
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 32 degrees the
output will be set to Fan Max.
• Integration Time – This setpoint controls
the inuence 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 – The maximum speed for the
variable speed fan output.
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