Page 19
ENGLISH
Jandy
®
TruDose
TM
Chemical Controller
|
Installation & Operation Manual
Section 5. Maintenance
5.1 Winterizing (extended
shutdowns or colder climates).
1. Turn off the controller and shut off the main power
to the controller.
2. Gently remove the pH and ORP sensors from
the fl ow cell. Fill the provided protective containers
(removed during installation) with pool water and
re-install onto each sensor and store in a warm
secure location.
3.
Drain the water from the fl ow cell.
5.2 Cleaning the sensor tips
NOTE:
It is important to keep the sensor tips clean to
ensure accurate readings.
Sensor tips should be cleaned every 6 months for
residential pools. Determine the necessary frequency by
comparing the readings before and after the cleaning.
Identical readings mean the cleaning time can be
extended.
1. Turn off power to the controller.
2. Close the right and left valves at the bottom of the
the fl ow cell.
3.
Loosen the nut on the compression fi tting and
gently remove the sensor from the fl ow cell.
4. Rinse the sensor with clean water.
5. Gently brush the junctions, glass bulb, and metal
strip using a toothbrush for 1 minute.
NOTE:
DO NOT touch the sensor tip.
6.
Soak the sensors for 2 minutes in a diluted solution
of muriatic acid (10 drops in 2 fl . oz of tap water).
7. Rinse the sensor in clean tap water for 1 minute.
8. Gently re-insert the sensor into the compression
fi tting and hand tighten the nut.
9. Plug in the power cord for the controller. Open
the fl ow cell valves and wait for a few minutes for
the system to stabilize, ensure there are no leaks
and get an accurate reading. Adjust the Set level if
necessary.
10.
If the sensor does not show the expected readings,
then it must be replaced.
5.3 Checking the pH Sensor
1. The pH sensor must be checked every 6 months or
after any incident when the pH level goes out of
range.
2. While still attached to the controller, place the
sensor in a clean glass of tap water. See Figure 16.
3. Add a small amount of acid or vinegar to the water
and take a reading. It should show a low number.
4. Place the sensor into a solution that is higher than
7.5 pH and verify that the reading is increasing
5. If the sensor does not show the indicated reading,
then it must be replaced.
5.4 Checking the ORP Sensor
1. The ORP sensor must be checked every 6 months
or after an over sanitization event.
2. Clean the sensor tip as shown in the previous
section.
3. Place the sensor in a clean glass of tap water. The
reading should show between 200mV and 400mV.
See Figure 16.
4. After adding a pinch of Dichlor or Trichlor into the
water, the reading should show between 750mV
and 800mV.
NOTE:
If a sanitizer with high pH is used in place of
Dichlor or Trichlor, the reading should show
between 650mV and 750mV.
5. If the sensor does not show the indicated readings,
then it must be replaced.
pH
7.2-7.6
ORP
600-800 mV
Figure 16. Check Sensors
