King Electric SST 3 - Manual (Page 20)

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. 20 of 28
GROUND FAULT OPERATION
USING THE GFEP TEST/RESET BUTTON
GFEP (Ground Fault Equipment Protection) circuitry is present inside this unit.
The system software checks for ground fault conditions continuously at set
intervals. If the GFEP LED is lit, press the GFEP Test/Reset button to try and
clear the situation and reset the ground fault circuitry. The GFEP will perform a
test of the ground fault circuitry, during which time, the GFEP LED will blink.
Pressing the button will not clear a “hard” fault. When the GFEP LED is lit,
unless the system has been set in Fire Protection Mode, the heaters are turned
off and will remain off until the condition is cleared. When the GFEP LED is not
lit, the operator may press the GFEP Test/Reset button, as desired, to manually
initiate a test of the GFEP circuitry. During the test, the GFEP LED will flash
rapidly for a few seconds while the unit first tests the internal circuitry and then
turns on the heaters to check for a ground fault, and will then shut off.
In the event of a ground fault condition that is not cleared by pressing the GFEP
Test/Reset Button, perform the steps below.
1.
If the GFEP LED on the control box is still lit after pressing the GFEP
Test/Reset Button, remove power from the unit using the service
disconnect or the circuit breaker.
2.
Perform a “megger” test of the heater cables and compare the results to
those obtained during Post-Installation Testing and recorded on page 2 of
this manual.
3.
Locate and fix the problem, typically found along the run of the heat tape.
Contact the heat tape manufacturer for help troubleshooting the heat tape.
4.
Restore system power. Because the presence of a ground fault condition
is stored in memory, even after repairing the ground fault condition, the
GFEP LED might still be lit following restoration of system power. In this
case, press the GFEP Test/Reset button again and the LED should go out
and normal operations can resume.