ST621TX INSTRUCTION MANUAL
8
There are few user controls for the ST621TX, making
the programmable thermostat very easy to operate.
The controls are a Touch Ring (which surrounds the
user display), two touch sensitive buttons, a reset
button and a slide operated switch mounted on the
side of the thermostat.
USER CONTROL FUNCTION SUMMARY:
Key / Operation
Functions
Touch Ring (move clockwise)
Increases the selected setting and scrolls
down the menu selection
Touch Ring (move anti- clockwise)
Decreases the selected setting and
scrolls up the menu selection
OK Key
Enters Menu or confirms a menu selection
Arrow (Back) Key
Single touch – sets the unit back one step.
Hold for two seconds sets the unit back to NORMAL mode
Reset Button
Resets the programmable thermostat to default (original factory)
settings except Service setting (when Service is on)
Slide Switch
Activates and deactivates the key lock function
(prevents accidental changes)
