S90-600 O FRICK QUANTUM EVAPORATOR CONTROL PANEL
Page 18 OPERATION
Enhanced Unit Setpoints
· Humidity Control On - If the humidity reading is
less than or equal to this setpoint, the humidity
output will be energized or turned on.
· Humidity Control Off - If the humidity reading
equals or exceeds this setpoint, the humidity
output will be de-energized or turned off.
Two-Speed Fan Control settings:
· Temperature On - If the control temperature
reading equals or exceeds this setpoint, the fan
low speed output will be energized or turned on
to run the fan at low speed.
· Temperature Off - If the control temperature is
less than or equal to this setpoint, the fan low
speed output will be de-energized or turned off to
stop the fan.
· Low - High temperature - If the control
temperature reading equals or exceeds this
setpoint, the fan low speed output will be de-
energized or turned off and the fan high speed
output will be energized or turned on to run the
fan at high speed.
· High - Low temperature - If the control
temperature is less than or equal to this setpoint,
the fan high speed output will be de-energized or
turned off and the fan low speed output will be
energized or turned on to run the fan at low
speed.
· High – Low Delay – The amount of time in
minutes to delay before starting the low-speed
fan after the high-speed fan has been stopped.
This time is intended to be the time it takes for
the high-speed fan to slow down and eventually
stop.
Two-Step Fan Control settings:
· Temperature On - If the control temperature
reading equals or exceeds this setpoint, the fan
step 1 output will be energized or turned on to
run the step 1 fan or fans.
· Temperature Off - If the control temperature is
less than or equal to this setpoint, the fan step 1
output will be de-energized or turned off to stop
all fans.
· Step 2 On - If the control temperature reading
equals or exceeds this setpoint, the fan step 2
output will be energized or turned on to run the
step 2 fan or fans.
· Step 2 Off - If the control temperature is less
than or equal to this setpoint, the fan step 2
output will be de-energized or turned off to stop
the step 2 fan or fans.
Modulating Valve:
Note: The suction valve must be direct for this
control.
· On – If the control temperature reading equals or
exceeds this setpoint, the suction valve output
will be energized to open the valve.
· Off – If the control temperature reading is less
than this setpoint, the suction valve output will be
de-energized to close the valve.
· Setpoint – The difference between this
temperature setpoint and the control temperature
reading is compared to the “deadband” setpoint.
If the difference is within the deadband, no
change is made to the analog signal of the
modulating valve. If the difference exceeds the
deadband, then the difference is multiplied by the
“rate of change” setpoint and the analog signal is
increased by this amount to further open the
suction valve if the control temperature reading is
higher than this setpoint. The analog signal is
decreased by this amount to further close the
suction valve if the control temperature reading is
lower than this setpoint.
· Deadband – The number of degrees in
temperature that the difference of the
temperature setpoint and the control temperature
reading must exceed to change the analog signal
to the suction valve.
· Rate of Change – This is the percent that is
multiplied to the difference of the temperature
setpoint and the control temperature reading
when this difference exceeds the deadband. If
the control temperature reading is higher than
this setpoint, then the analog signal to the
modulating valve is increased by the result to
further open the suction valve. If the control
temperature reading is lower than this setpoint,
then the analog signal is decreased by this result
to further close the suction valve.
· Min (Minimum) – This is the minimum percent of
the analog signal that is sent to the modulating
valve when the “On” setpoint is first reached and
the suction valve has opened.
· Delay – This is the minimum time in seconds to
delay before re-evaluating if the difference
between the temperature setpoint and the control
temperature reading exceeds the deadband
setting.
Temperature control is used to maintain a temperature.
The liquid valve is open to provide cooling. The suction
valve is also open during temperature control. Fan cycling
based on temperature can aid in energy savings. If the
temperature falls below the “Fan Off” setpoint the fans will
cycle off by de-energizing the proper output. There are
two setpoints that allow the operator to turn on and off the
fans for a period of time to provide for air movement while
the fans are cycled off. If the operator selects fan cycling
and the fans are cycled off, the fans will remain off for the
entered number of “Off” minutes. After the fans are off for
the entered amount of minutes and the air temperature is
still below the “Fan Off” setpoint, the fans will be
energized for the “On” number of minutes. This on/off
cycling continues until the temperature rises above the
“Fan On” set point in which the fans start and continue to
run.