21776 Rev E 09/16(800) 234-4239www.networketi.com
4 of 12 Environmental Technology, Inc.
Model EUR–5A Snow & Ice Melting Control
Operation
The snow and ice melting system normally will operate automatically. When any sensor detects snow or ice,
the heater output will turn on. When snow or ice is no longer present at any of the sensors, then the hold-on
time starts.When the hold-on time is complete the heater output will turn off. If snow or ice is detected during
the hold-on period, then hold-on is canceled while the heat remains on.
The Hold-On Time control sets the amount of time that the heater remains on after snow or ice is no longer
present. This is to ensure that the melting process is complete. An initial setting of 5 hours may be a good
starting point, and observation of the results a few hours after a snow event can allow this to be adjusted
optimally. It’s important that the area becomes dry enough to avoid re-freezing of melt water.
The Heater Cycle pushbutton will turn on the heat even if no snow or ice is detected. The heat will then remain
on for the set hold-on time. If the Heater Cycle pushbutton is pressed again, then the heat will be turned off
(the hold-on time is canceled).
If heat is already on due to snow or ice being sensed, then the Heater Cycle pushbutton will have no effect. If
heat is already on due to hold time, then the Heater Cycle pushbutton will cancel the hold time and turn the
heat off. Pressing the Heater Cycle pushbutton again will reinstate the full hold-on time.
The calibrated 40°F to 90°F (4°C to 32°C) high temperature limit prevents excessive temperatures when
using constant wattage and MI heat cable saving energy and preventing potential damage. It also permits
safe testing at outdoor temperatures too high for continuous heater operation.The temperature limit sensor is
included and must be connected to the system for proper operation. If, for any reason, you need to operate the
system without the high temperature limit sensor you can temporarily replace the sensor with a 470K resistor.
The RCU–3 remote control panel allows user control from a different location. The panel indicators show the
presence of system power and whether the heat is on. The Heater Cycle pushbutton allows control of the heater
Cycle Time.When the Cycle Time time is active, it can be interrupted or reinstated by pressing the button. The
remote Cycle Time control allows adjustment from 2 to 8 hours.This remote Cycle Time applies only when the
remote Heater Cycle pushbutton is used; during automatic operation, the setting at the EUR–5A will be used.
A separate Remote Heater Toggle, a user option, can be connected to function identically to Heater Cycle
pushbutton on the EUR–5A. This allows Heater Cycle operation with the hold time set on the EUR–5A.
The Energy Management Computer connected to the EUR–5A can monitor the system status. Signaling is
provided to the EMC for power supply present, snow present, and heater on/off status. In addition, inputs on
the EUR–5A allow the EMC to override the EUR–5A automatic operation by either holding the heaters on or
holding the heaters off at any time.
