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SNOW/ICE CONTROL INSTALLATION MANUAL | PART NO. 23918 REV B
16
SETTING THE HOLD-ON TIME
Heating action begins a few seconds after the system
sensor(s) detect moisture at or below 38°F (3.3°C).
However, heating action continues even after the sensor
no longer detects moisture based on the Hold-On Time
setting. The Hold-On Time control knob allows you to set
the length of time the unit will continue heating even after
the sensor(s) no longer detect moisture. This is benecial
because it typically takes longer for ice to melt than it took
to form initially and also because it keeps moisture from
re-freezing before it has fully melted. As indicated on the
front panel, the Hold-On Time can be set for anywhere
from 0 to 8 hours as indicated by the arrow on the control
knob. Note that if the Hold-On Time control knob is set at
0 (as shown in Figure 6), the system will produce heat only
for as long as the sensor(s) detect moisture but no longer.
For that reason, and to ensure more effective heating, it is
recommended that the Hold-On Time be set up closer to
the mid-way point, corresponding to about 2 to 6 hours.
Set or increase the Hold-On Time as desired by rotating
the control knob to the right or clockwise. Decrease the
Hold-On Time setting by rotating the control knob to the
left or counterclockwise. Again, remember that if the Hold-
On Time control knob is set at 0, the unit will produce heat
only for as long as the system sensor(s) detect moisture
and no longer.
USING THE HEATER CYCLE BUTTON
The Heater Cycle control button allows you to manually
initiate a heating cycle regardless of weather conditions,
whether or not the sensor currently detects moisture, and
regardless of the temperature. The Heater Cycle control
button also allows the operator to cancel a heating
cycle currently in progress, regardless of the Hold-On
Time setting, unless the SNOW LED is on, indicating
the sensor(s) currently detect moisture at or below 38°F
(3.3°C). Remember, if you manually initiate a heating
cycle by pressing the Heater Cycle button, that heating
cycle will last for the duration of the current Hold-On Time
setting, unless manually cancelled by pressing the Heater
Cycle button a second time.
It is not necessary for the Hold-On Time setting on the
control box and the Hold-On Time setting on the RCU
to be identical. Note, however, that if a heating cycle is
manually started by pressing the Heater Cycle button on
the control box, that the resulting heating cycle will last
as long as the Hold-On Time setting on the control box.
Similarly, if a heating cycle is initiated using the RCU, the
resulting heating cycle will last as long as the Hold-On
Time setting on the RCU.
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, 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 ash rapidly for a few
seconds while the circuitry rst tests the inside of the unit,
then the system heater coils, 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 x the problem, typically found along the
run of 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
may resume.
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