MiniWarden/PoolWarden + (PLUS) Operation Manual • www.poolwardentraining.com • 31
Manual Operation
The TrueDPD should be manually operated to verify correct operation after
installation and from time to time. Select Manual Control in the TrueDPD
menu to manually control the TrueDPD. Note that when some of the manual
actions are turned on, the stirring motor and green LED may turn on. On the
circuit, the right LED labeled Flow will flash about every second.
1. 1 = DPD: Pressing number 1 will manually feed a drop of DPD.
2. 2,4 = Flow: Pressing numbers 2 or 4 will turn on a water flow pump.
3. 3 = AllOFF: Will turn off anything that may be on in the TrueDPD except for the green LED.
4. 5 = AllOn: Will turn on everything to run continuously.
5. 9 = DPD Purge, this will turn on the DPD pump to purge the lines and you must press 3 to stop it.
Select this option to prime the DPD pump when re-filling the bottle.
Voltage: When the sensing chamber is clear the voltage should be between 3.5 and 4.9 V (3.50 is the
minimum). There is a small adjustment dial inside the TrueDPD that is used to set this voltage. When
some DPD is added and the sensing chamber water turns pink this voltage will drop. The amount that it
drops is an indication of the free chlorine level. Do not adjust when the door is open in direct sunlight.
Manual Cycle: To operate a manual cycle, turn on the flow to clean out the sensing chamber with the
water to be measured, the magnet will also be spinning and after 20 seconds press 3 to turn the water flow
off. The clear voltage should be between 3.5 and 4.9 V. Press number 1 two times to feed two drops of
DPD, press at least 1 second apart. Observe the voltage dropping and leveling off after 20 to 40 seconds.
When done turn on a flow to clean out the sensing chamber.
PPM Calibration
The following conditions prohibit calibrating the PPM. In order to calibrate the conditions must be corrected.
t The TrueDPD is currently making a measurement, wait until finished.
t The displayed PPM is ”- - -”. A valid measurement is required to be able to calibrate.
t There must be enough chlorine in the water for the DPD voltage to be at lease 1.0 volt below the clear
voltage which is about 0.5 PPM. If the chlorine is low calibrating the PPM is disabled.
t Using MPS will temporarily give a false chlorine PPM reading as well as a high ORP level. When using
MPS, verify chlorine level manually for 24-48 hours.
t Free chlorine measurement is limited to 9.5 PPM. When shocking with chlorine, PPM reading may not
read correctly for 24 hours until the free chlorine drops below 9.5 PPM.
Maintenance / Troubleshooting
t Clear voltage drops over time: The most common cause is the flow cell chamber is dirty. This most
likely happens if the controller is turned off during a measurement after a drop or two of the DPD
reagent has been added. 1: Replace liquid in reagent bottle with fresh water, 2: Go to the TrueDPD
manual control and press 9 to run fresh water through the reagent tube for at least 2 minutes, 3: Turn
the water in valves off and disconnect both tubes to the injector, 4: Unscrew the injector by hand, 5:
With a Q-tip wipe the sides of the sensing chamber until clean, 6: Hand tighten the injector back in
place - IMPORTANT: Never tighten the injector with a wrench! IMPORTANT: The small tube on
the top of the injector must be on the left side when done, 7: Reconnect the injector tubes, 8: Refill
the reagent bottle with reagent, 8: Open the water in valves, 9: From the readings screen press 6 for
the TrueDPD info screen and press 2 to purge the reagent - at this point the sample chamber is filled
with reagent, 10: IMPORTANT: Press 3 or 9 to start a measurement cycle to clean out the
chamber. If there is no flow in the pool the measurement will abort and the chamber will need to be
flushed using the TrueDPD manual control.
t Pump tube replacement: The peristaltic pump top simply twists off, there is no need to remove the
pump!
1=DPD 9=DPD Purge
2=Flow1 4=Flow2
3=AllOFF 5=AllOn
6=Stir v=4.25
Manual Control
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