Control Setup - "Heating Control Setup" Screen - Frick QUANTUM ACUair Operation Instructions Manual

S90-500 O
Page 16
Proportional Band calculation. While the Return Air
Temperature is greater than 39 °F (the Process Control
Setpoint plus the Proportional Band) the PID output holds
at 95% (Process Cooling CV Max). As the Return Air
Temperature drops below 39 °F, the PID output drops
based on the Proportional calculation. At 38 °F the PID
output is 75%, at 37 °F the output is 50%, at 36 °F the
output is 25% and below 35 °F the PID output drops to 5%
(Process Cooling CV Min).
Temperature begins to rise, the PID output remains at 5%
until the Return Air Temperature reaches 38 °F (the
Process Control Setpoint plus the Differential Setpoint).
As the Return Air Temperature rises above 38 °F, the PID
output immediately jumps to 75% and continues to be
calculated as described above until the temperature again
drops below 35 °F.
The Heating Control Setpoints listed above maintain
temperature during Cleanup Mode.
While heating with a Modulated Burner in Cleanup Mode,
the unit tries to maintain
Temperature. When the Outside Air Temperature drops
below the Cleanup Heating Lockout, the Burner digital
output is turned on and the Burner analog output is set to
the Cleanup Heating CV Min Setpoint. When the Burner
Status input detects that the flame is on, the Heating PID
output begins to control the Burner analog output and to
move the Discharge Air Temperature toward the Cleanup
Heating Setpoint. The Heating Proportional Band, Dead
Band and Integration Time adjust the speed and precision
of the PID control. The Cleanup Heating CV Max and Min
set the range for the PID loop.
The Burner digital output remains on and the Burner
analog output continues to modulate based on the
Heating PID output until the Outside Air Temperature rises
FRICK QUANTUM CONTROL PANEL
ACUair OPERATION
When the Return Air
CONTROL SETUP -
"HEATING CONTROL SETUP" SCREEN
the Cleanup Heating
As the Cooling PID output varies as described above, the
Cooling Stage #1 and #2 outputs are controlled by the
Stage #1 and Stage #2 Demand Setpoints. When the PID
output rises above 25% Cooling Stage #1 is turned on. If
the PID output continues to rise and reaches 50%,
Cooling Stage #2 is turned on, provided that 20 Sec.
(Interstage Delay) has passed since Stage #1 has turned
on. Both outputs remain on until the PID output drops
below 50%. At this point Cooling Stage #2 is turned off if
30 Sec. (Min. On Time) has passed since Stage #2 was
turned on. If the PID output drops below 25 % Stage #1 is
turned off if 30 Sec. (Min. On Time) has passed since
Stage #1 was turned on. After Stage #1 or #2 has been
turned off, 30 Sec. (Min Off Time) must pass before that
same output can be turned on again.
above the Cleanup Heating Lockout plus the Heating
Differential Setpoint. At this point, the Burner digital output
is turned off and the Burner analog output is set to the
Cleanup Heating CV Min Setpoint. The unit's Heating
control remains in this state until the Outside Air
Temperature drops or the unit exits Cleanup Mode.
The Min On Time Setpoint sets the minimum amount of
time the Burner digital output must be energized after it is
turned on. The Burner digital output will remain energized
for the Min On Time even if the Outside Air Temperature
rises above the Cleanup Heating Lockout plus the Heating
Differential Setpoint. In the same way, the Min Off Time
Setpoint sets the minimum amount of time the Burner
digital output must be de-energized after it is turned off.
The Burner digital output will remain de-energized for the
Min Off Time even if the Outside Air Temperature drops
below the Cleanup Heating Lockout.