Programming The T20 Timer
The T20 timer is fully programmable; it accepts input via 4 push buttons. The but-
tons are marked (P) for programming, Up and Down for data entry and a reset
button (R). Pressing the (P) button during normal operation stops the pump and
allows entry to the timer’s menu. Subsequent pressing of the (P) button steps
you through the menu from one option to the next. Each option can be adjusted
using the up and down buttons. Pressing the (P) button stores the settings you
make into the timer’s memory and steps you to the next option. When you reach
the end of the option list the timer asks you to accept the settings you have made
and to press the (P) button to resume normal running. You can automatically
save any changes you have made and exit out of the menu at any stage during
programming by simply pressing the (R) reset button. The settings you make are
non-volatile and are recorded in the timer’s memory. Your setting will not be lost
if the timer is switched off for extended periods. When the unit is switched back
on the timer will boot up and operate using the setting you previously recorded in
its memory.
2) The best way to switch off a function that you have previously selected and
subsequently decided not to use is to purge the entire program and restore it to
its default state rather than simply switch the particular function off. Purging the
program ensures the functions are properly disabled and their stored values are
all set to zero or off. To purge the program press the (P) button and the (R) reset
button. Release the reset button while still holding the (P) button down, then re-
lease the (P) button. The LCD screen will display the message “Settings Cleared,
Press (P) to Continue” Press (P) and then step through the program making your
new selections as you go.
3) Set realistic and sensible values into the various functions. For example, do
not set a pump to cycle on and off rapidly. Always set the T20’s running and stop-
ping times to realistic values.
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Summary of Contents for T20
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