Appendix - Process Technology Lufran LUF Series Manual

APPENDIX:

-23 Configuration
This section applies only to units that include the "-23" optional configuration. This configuration adds the
ability to operate the heating column(s) at a preset output during periods of no hot water demand, when
there is a low "trickle flow" of DI water passing through the unit.
Low Flow Bypass Calibration Startup Procedure:
This calibration procedure should be performed before the first time the unit is operated during a Low
Flow Bypass, and whenever the flow rate during this bypass or the process set point changes.
Operation of the heater during the Low Flow Bypass will disable the DAC control system and allow the
unit to operate under a manual % output form of control. The % output is designated by the operator. By
observing the performance of this unit under the selected % output, the operator may adjust the heater %
output to improve heater response during Low Flow Bypass, allowing the heater to maintain the process
set point.
This procedure must be performed following the STARTUP PROCEDURE provided in this manual.
1) Once the startup procedure is complete, lower the process flow rate to the desired "Low Flow
Bypass" flow rate. Ensure that this is a steady flow of water through the unit. Fluctuations in water
flow will affect the results of calibration.
2) Access the TRICKLE FLOW menu on the touch screen interface. Use the buttons on the navigation
panel to first access the MAIN menu, and then press the CONFIG button at the bottom of the main
menu screen. Enter the password (default = 1234). This will bring you to the first screen of the
CONFIGURATION menu. Press NEXT to reach the second screen of the CONFIGURATION menu.
3) Press the TRICKLE FLOW RATE button and enter the current flow rate.
4) Press the TRICKLE OUT % button. This button will display the CURRENT OUTPUT %. The operator
can change this value by pressing the button. A numeric keypad will appear to allow the operator to
enter a new % output value. The operator must press ENTER (◄┘) on the keypad in order to save
the new value.
5) Press MAIN, this will return to the main menu. Restore flow and press heater enable button. Once
temp has stabilized drop flow to the desired trickle flow rate. The unit will go into trickle flow mode,
and output % will be value set previously. repeat process until the output % is able to maintain
temperature
6) Compare the outlet temperature of the unit to the desired process set point.
7) If the outlet temperature is higher than the desired process set point, then decrease the MANUAL %
OUTPUT.
8) If the outlet temperature is lower than the desired process set point, increase the MANUAL %
OUTPUT.
9) Repeat steps 7-8 until the outlet temperature matches the desired process set point. Once the unit
outlet temperature matches the desired process set point the unit is calibrated.
10) Return to the CONTROL ACCESS menu, and return the system to REM mode, to allow for remote
operation.
NOTES ON OPERATIONAL CONDITIONS:
The system will revert to low flow bypass mode when the flow rate drops below the set value. The

only means to turn off the heater if needed is to return to the main menu and turn off the heater
enable button

While in "low flow bypass" mode the "Low Flow" alarm will be inactive. ALL other safety circuits ARE
active.
M-43-25
Revision - Date: 03-01/04/18
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LUF-series Lufran Manual
Single outlet, Standard Interface