King Electric SST 3 - Manual (Page 17)

Adjustable Electronic Thermostat TRACON
®
Model SST–3 (P/N 24492)
Instruction Manual
24494 Rev. - 04/12 (800) 234-4239 http: www.networketi.com Environmental Technology, Inc. 17 of 28
NORMAL OPERATIONS
Under normal operations, as long as facility power is running to the unit, the
green SUPPLY LED will be lit solid and the system will provide heat, indicated by
the yellow HEAT LED, based on the thermostat set point. Any error condition
that might occur will be indicated in the display window. Error codes are
explained on page 21. The unit is designed to turn the heaters on as soon as the
temperature reading at the point of the temperature probe drops below the set
point and will keep the heaters on until the temperature reaches 2 degrees F or 1
degree C higher than the set point, at which time the heaters will shut off. Should
it be desired to change the set point, do so using the Up and Down control
buttons on the front panel of the unit as described on page 16.
THE DISPLAY WINDOW
The unit has a 3-character display window which provides useful information
regarding the function and condition of the system. During the 2-second system
initialization process, in the first half-second, the yellow Heat LED will come on
and the window will display the first character. In the second half-second of
initialization, the red GFEP LED will come on and the window will display the
second character. In the third half-second of initialization, both LEDs will come
on and the window will display the third character. Finally, in the fourth half-
second, both LEDs shut off and the firmware version number will be displayed.
A Fahrenheit reading will be displayed as one or two digits, followed by an F. A
Centigrade reading will be displayed as one or two digits, followed by a C.
Should the temperature be above 100, as the display has but three characters, a
reading of three digits without a letter following indicates a Fahrenheit reading.
If the GFEP Test / Reset button is pressed for at least 1 second, the display will
show the current ground fault level in mA instead of the temperature.
If the temperature probe is bad, the window will display an approximation of
question marks, followed by an F or a C.
During normal operations, the display window will show the current temperature,
as well as flash with any current alarm condition, if there is one. If there are no
current alarm conditions, the display will show just the current temperature.