MANUALPC-2010 CHAPTER III -STARTUP Page 23
If the pH is below 7.0:
CAUTION: CORROSIVE CONDITION. Add a base
(Soda Ash, Caustic Soda NaOH, pH PLUS, pH UP, etc.)
to raise it as soon as possible.
If the pH is above 8.0:
CAUTION: SCALING CONDITION. Add an acid
(Muriatic Acid, Hypochloric Acid HCl, Sodium Bisulfate,
pH MINUS, pH DOWN, etc.) to lower it.
If the test kit value differs from the value shown on the
controller display, select the pH Calibration Submenu 3.2 (see
page 35) and enter the value indicated by the test kit, using the
1-Point Calibration option.
For more accurate calibration with two or three points, repeat
the same process at two or three different pH values using
calibrated standard solutions of appropriate values. Most
common values are for pH 4.0, 7.0 and 10.0.
pH Feed (Acid or Base)
The CHEMTROL® PC has two pH control relays, one for Acid
feed and one for Base feed. Acid Feed is activated when the
pH is above the setpoint and Base Feed when it is below the
setpoint.
In most cases, only one type of chemical is required, i.e. either
acid or base, depending mostly on the type of sanitizer used.
Make sure to connect the acid or base chemical feeder to the
proper outlet on the Power Board (Error! Reference source
not found.).
pH Setpoint
T
he default value for the pH setpoint is 7.5. It can be modified
at any time through the pH Menu.
ORP Calibration
T
he ORP sensor is direct reading and does not require
calibration.
ORP Setpoint
The default value for the ORP setpoint is 700 mV. It can be
modified at any time through the ORP Setpoint Submenu 1.3
(page 31).
The controller will automatically activate the chlorinator,
brominator or ozonator whenever the reading is below the
ORP deadband. It will stop automatically as soon as the
reading is above the ORP setpoint.
Sanitizer Calibration
NOTE: Make sure to adjust the pH between 7.4 to 7.5 before
calibration of the sanitizer.
Test the water with a DPD or FACTS test kit for Free Chlorine
or Bromine. Do not use an OTO (Total Chlorine) test kit.
Make sure that the test solution is fresh and test at least twice
or until you get consistent readings.
The water should test close to 1.5 ppm for chlorine or 3.0 PPM
for bromine.
- If the water tests below these values: Add sanitizer as
needed to bring the PPM reading to a proper value.
- If the water tests above 3.0 ppm for chlorine or 8.0 ppm for
bromine:
a. wait until the level is reduced to below these values,
b. add a reducing agent (Sodium Thiosulfate), or
c. replace part or all of the water.
Select the Sanitizer Calibration Submenu 2.1 (page 33) and
enter the value indicated by the test kit.
Time Limits
The Time Limits for each outlet should be set for the length of
time that can be safely tolerated for chemical overfeeding - in
case of equipment malfunction or operator error. This time
limit varies with each installation, based on the size of the
installation (gallons of water) and the feed rate of the chemical
feeders.
If needed, see your CHEMTROL® PC Qualified Dealer for
assistance.
Shock Treatment
I
t is recommended to wait several weeks before using the
automatic superoxidation or superchlorination cycle, or until all
the other operating functions of the controller have been
properly tested.
Chemical Saver
T
he Chemical Saver program is used to lower the oxidizer or
sanitizer level when there is little use, such as at night or on
weekends.
Chlorination should be prevented completely whenever a pool
cover is in place.
It is also recommended to stop sanitizer feed for pools where
there is insufficient mixing of water at night - due to the lack of
water mixing by swimmers or convection currents. This can
lead to stratification of the chemicals in the water and eventual
overchlorination.
WATER SATURATION
The CHEMTROL® PC features automatic calculation of the
Langelier Saturation Index Submenu 8.2.3 (page27).
It is recommended to check the water saturation as soon as
possible after installation to prevent damage to the equipment
through corrosion or scaling. This should be done immediately
after calibration of the pH and temperature sensors, using a
reliable test kit to obtain the alkalinity and calcium hardness
values.
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