Chemtrol PC6000 - Limit Timers (Overfeed Safety ); Timer Settings; Periodic Maintenance; Water Testing

MANUALPC-2010 CHAPTER VI – MAINTENANCE Page 57
Limit Timers (Overfeed Safety)
The Time Limit settings are designed to disable the feeders or
other equipment in case of equipment failure or operator error
such as:
- sensor or electronics failure,
- chemical feeder malfunction,
- improper valving of the recirculation system,
- manual override of automatic control by untrained or
unauthorized personnel,
- depletion of chemical supply.
In normal operation, the chemical feeders are activated only for
a short period - that is until the chemical level in the water has
returned to the proper value. As soon as the chemical feeder
is activated, the safety timer is turned on. Normally, feeding
stops before the time limit is reached. The timer then resets to
zero and waits for the next activation cycle.
However, if feeding continues over the preset time, the timer
immediately stops the feeder and activates the overfeed alarm.
After correcting the malfunction, reset the timer by momentarily
setting the limit to 0 (see Chapter IV – Operation, page 24).
Timer Settings
To select the proper setting for each safety timer, the operator
must take into consideration the size of the pool or spa and the
feed rate of the chemical feeder. In case of doubt, make sure
to consult a qualified CHEMTROL® representative or call the
factory.
NOTE 1: The chemical feeders should be properly sized for the
installation so that they do not have to feed continuously for
more than 3 hours - even during peak usage periods.
NOTE 2: Once tripped, the safety timer has to be reset
manually by the operator after investigation and correction of
the malfunction.
PERIODIC MAINTENANCE
Water Testing
1
. Test the water with a reliable and fresh test kit daily or as
often as required by the local health department.
2. Adjust the reading of the display if needed.
3. If the PPM or pH readings are out-of-range:
a. Investigate and correct the cause of the problem
immediately,
b. Readjust the water manually if needed and recalibrate
the displays.
4.If the displays cannot be recalibrated after adjustment of the
water chemistry, clean the sensor tips and recalibrate the
displays.
5. If the displays still cannot be calibrated, see the
TROUBLESHOOTING section.
Shock Treatment
Even when maintaining the proper chlorine residual level with
Chemical Automation, it is recommended to shock or
superchlorinate the water periodically for the following reasons:
1. To prevent algae growth resulting from genetic adaptation
of algae species to chlorine, i.e. becoming chlorine
resistant.
2. In the event that the chlorine level is allowed to fall below
the normal level, even for a short period (due to
exhaustion of chemicals or technical malfunction), there
can be formation of chloramines. These can be destroyed
only by breakpoint superchlorination.
WARNING: If the chloramine concentration exceeds 0.2 PPM
(mg/l), it is recommended to superchlorinate at
10 times the combined chlorine level.
The shock treatment program can be set up either through the
ORP Menu, using the proper daily or weekly program
schedule.
Precautions
A. During superchlorination, the Limit Safety Timer is
disabled.
B. A SHOCK treatment warning is displayed on the Display
Screen when activated.
C. The out-of-range alarms stay on as long as the oxidizer or
sanitizer levels are above the high limits.
ALWAYS MAKE SURE TO TURN
OFF THE CONTROLLER AND
SHUT OFF THE BYPASS LINE
WHEN DOING GENERAL POOL
MAINTENANCE SUCH AS
BACKWASHING OR REPAIRS.