MANUAL
®
We manage heat
®
Automatic Snow/Ice Melting System Control
MODEL EUR™–
5A
Installation and Operation Manual
Environmental Technology, Inc.
1850 N Sheridan Street
South Bend, Indiana 46628
(574) 233-1202 or (800) 234-4239
FAX (574) 233-2152 or (888) 234-4238
http://www.networketi.com
21776 Rev. E 09/16 (800) 234-4239 www.networketi.com
Environmental Technology, Inc.
Model EUR–5A Snow & Ice Melting Control
Table of Contents
Product Overview ...................................................... 3
Operation ................................................................... 4
Installation ................................................................. 6
Troubleshooting ...................................................... 10
Ordering Information, Warranty and Service ........... 11
Terminal Connections .............................................. 12
Specifications .......................................................... 13
!
Safety
Make sure that your installation and all electrical connections conform to the NEC (ANSI/NFPA 70) in the
United States of American, to the Canadian Electrical Code in Canada, and to all applicable local electrical codes and laws.
The EUR–5A, RCU–3, and ETI environmental sensor are all rated as NEC Class 2 devices.
Items included
Quantity Description Part Number
1 EUR–5A Snow and Ice Melting Control
1 High Temperature Limit Sensor
1 Power Transformer, 50 VA, 120 V to 24 V
1 RCU–3 Remote Control
1 Fuse Kit
1 EUR–5A Installation and Operation Manual (this document)
21496
25076
14257
21357
21184
21776
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21776 Rev E 09/16(800) 234-4239www.networketi.com
Model EUR–5A Snow & Ice Melting Control
vement-Mounted
120
Product Overview
The EUR–5A snow and ice melting control provides automatic control of a snow and ice melting system.
It includes an interface for environmental sensors, heater contactors, and a building Energy Management
Computer. A remote control is included to supplement the front panel controls.
Figure 1 shows a typical snow melting system using the EUR–5A. It is compatible with all ETI snow and ice
sensors including the CIT–1 aerial sensor, GIT–1 gutter sensor, and the SIT–6E pavement sensor. The EUR–5A
also includes a High Temperature Limit Sensor for maximum energy efficiency.
Using at least two environmental sensors improves system performance through superior coverage. A single
environmental sensor can miss tracked or blowing and drifting snow. When multiple sensors are connected,
any one of them detecting snow or ice conditions will signal for the heating process to start.
When snow or ice is no longer detected by the environmental sensors, the heater hold-on time begins. During
hold-on time, heater operation continues for a user-adjustable time interval from 0 to 10 hours. The hold-on time
continues heating for this set amount of time to ensure complete melting and sufficient drying to prevent re-freezing.
The EUR–5A includes an adjustable high temperature limit function. This function has two benefits. The high
temperature limit can save energy by turning the heat off when the temperature is high enough for natural
melting to occur. The high temperature limit is also useful in systems using MI heat cable and other constant
wattage heat cable to prevent unnecessarily high temperatures and excessive energy use. This feature can be
overridden when using self-limiting heaters. The high temperature sensor can be mounted in a place where
it can accurately sense the pavement temperature or ambient air temperature.
Due to the location of the EUR–5A, typically mounted in an electrical enclosure, an additional control location
may be necessary. The EUR–5A comes with an RCU–3 remote control unit that can be mounted in a convenient
place where an operator can monitor conditions and adjust the system operation accordingly.
The EUR–5A provides an interface that can communicate with a building’s Eenergy Management Computer
(EMC) system. The EMC interface provides dry switch contacts for communicating system status and inputs
to allow the EMC to override the EUR–5A.
The EUR–5A operates from a 24 VAC NEC Class 2 power source. A 120 VAC to 24 VAC control transformer is
included for use in installations with 120 VAC power. Since the EUR–5A is an NEC Class 2 device, a customer
supplied auxiliary relay is required for operating the heater control contactors when using electric heat cable.
ETI RCU-3
Remote Control
Figure 1.
Typical EUR–5A
installation
Fuse
Building/Energy
Management
Computrt Interface
Remote
Heater Toggle
Contacts
Aerial Snow Sensor
Equipment
Ground
Fuse
ETI CIT-1
ETI GIT-1
Gutter Ice Sensor
ETI SIT-6E
Pa
Sensor
ETI
Temperature
Limit Sensor
ETI EUR-5A
Snow Switch
Transformer
ETI
Heater Load
Control
CR-2
Contactor
CR-1-1
50 VA
VAC
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CR-1
Auxiliary
Relay
Included items
Additional items
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.
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21776 Rev E 09/16(800) 234-4239www.networketi.com
EUR–5A Front Panel
The EUR–5A front panel provides the following controls and indicators:
• SUPPLY indicator – This green LED indicates that the EUR–5A is receiving 24 VAC power.
• HEAT indicator – This yellow LED indicates when the heaters are on. Also it will flash if the high
temperature limit sensor is disconnected.
• SNOW indicator – This yellow LED Indicates when any of the sensors reports the presence
of ice or snow.
• HEATER CYCLE pushbutton – initiates or terminates heater hold-on time.
• HOLD-ON TIME adjustment control – sets the amount of hold-on time from 0 to 10 hours.
• HIGH TEMPERATURE LIMIT – sets maximum temperature from 40°F to 90°F (4°C to 32°C).When that
temperature is reached, the heat will always be turned off.
Model EUR–5A Snow & Ice Melting Control
Figure 2.
EUR–5A
front panel layout
Figure 3.
RCU–3
remote control
for EUR–5A
RCU–3 Remote Control Unit
The RCU–3 panel provides the following controls and indicators:
• HEAT indicator – This yellow LED indicates when the heaters are on.
• HEATER CYCLE pushbutton – initiates or terminates Heater Cycle time.
• CYCLE TIME adjustment control – sets the amount of hold-on time from 2 to 8 hours. This hold-on
time is used only when the remote Heater Cycle pushbutton on the RCU–3 is used. Otherwise, the
hold-on time setting at the EUR-5A panel is used.
Remote Heater Toggle
A separate momentary Remote Heater Toggle switch (not included) can be mounted at a convenient accessible
location and connected with the EUR–5A to provide external Heater Cycle control.
This switch will initiate heater operation for the hold-on time set by the EUR–5A. If it is operated during the
hold-on time, then heater operation is terminated.
Energy Management Computer Interface
The EUR–5A provides three contact-closure outputs to the EMC to indicate operational status with indications
of Supply Present, Snow Present, and Heat On.
The EUR–5A automatically controls the snow melting heaters based upon environmental conditions; this is the
default operation of the system. Meanwhile the EMC can also control the EUR–5A by overriding its automatic
operation. The heat can be held on or held off.
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Model EUR–5A Snow & Ice Melting Control
Remote Heater Toggle Return
3.95 in.
(bottom
view)
2.96 in.
4.31 in.
109.5 mm
3.95 in.
100.3 mm
109.5 mm
3.95 in.
100.3 mm
2.36 in.
60 mm
3.95 in.
100.3 mm
Installation
The system installation with the EUR–5A snow and ice melting control should be performed by a qualified,
licensed electrician. The installation and all electrical connections should conform to the NEC (ANSI/NFPA
70) in the United States of American, to the Canadian Electrical Code in Canada, and to all applicable local
electrical codes and laws.
The EUR–5A and ETI sensors are Class 2 devices and utilize Class 2 wiring. The EUR–5A should be housed in
a protected location that meets local electrical code. The EUR–5A can be mounted in the same panel as the
heater contactors, as long as no unrelated circuits are present and the required internal spacings and barriers
are implemented. If the EUR–5A needs to be located in an area where it might be exposed to environmental
hazards the EUR–5A should be housed in a NEMA enclosure suited for the local environment.
Figure 4 shows the dimensions of the EUR–5A. The EUR–5A can either be mounted to a 35 mm DIN rail, or
mounted directly to the panel using the DIN rail latch, detached and reversed, as a mounting block.
Figure 4.
EUR–5A dimensions
and mounting
75.2 mm
100.3 mm
To Install
DIN Rail Mounting
Bulkhead Mounting
Bottom view
To Remove
4.31 in.
(bottom
view)
6 of 12 Environmental Technology, Inc.
2.36 in.
60 mm
21776 Rev E 09/16(800) 234-4239www.networketi.com
Model EUR–5A Snow & Ice Melting Control
120
oltage
to Sensors
Power Source and Contactor Connections
The EUR–5A operates from a 24 VAC NEC Class 2 power source. The optional 120 to 24 volt control transformer
is included for use in installations using 120 VAC power.
Figure 5 shows power and contactor connections for a typical installation. Since the EUR–5A is an NEC Class
2 device, it usually requires a customer-supplied auxiliary relay for operating the heater control contactors to
separate the Class 2 circuit from the power circuits. In case your installation is different and the necessary
connections to the EUR–5A are unclear, Customer Service is available for assistance.
Figure 5.
Power and contactor
connections
No Connection
24 VAC Return
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
Remote Heater Toggle Return
Remote Heater Toggle
No Connection
Sensor 24VAC (Red)
Sensor Signal (White)
Sensor Ground (Black)
No Connection
Control Relay Common
Control Relay NO
Control Relay NC
V ac
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
AC
24 V
Heater
Control
Contactor
Figure 6.
Inline Fuse connections
to V
Supply
Inline Fuse
2.0 Amp
ETI
Transformer
Customer Supplied
Auxiliary
Relay
Inline Fuse Connections
The supplied inline fuses, rated at 2.0 amps, are used to protect the
EUR–5A and its connected devices.
Figure 6 shows how these are connected. One of them is in series
with the 24-volt supply to the EUR–5A. The other is in series with
100 Ω
the 24-volt supply connection to the environmental sensors that
use power (this power source is full-wave rectified). These fuses
are necessary to protect the EUR–5A from an overload or short in
the sensor or its wiring.
The 24 VAC Return is not ground; a floating ac power source, such
as the transformer secondary, is used here.
18 19
Figure 7.
EUR–5A unit ground to
Building Panel Ground
with 100 ohm resistor
Grounding
The EUR–5A sensor circuits and the EMC inputs are referenced to a common circuit ground. In most situations
this part of the system can be left floating from the building panel ground (not connected to it). In some
cases, noise or transient immunity may be improved if the EUR–5A (with its sensors) is actually grounded to
the building ground. But this can create a voltage difference on the sensors because of the difference in the
electrical potential of the building ground and the outdoor building structures contacting the sensors creating
a ground loop. To avoid this potential ground loop install a resistor, such as 100 ohms, between the EUR–5A
ground terminal (18 or 19) and the building panel ground.
Building
Panel
Ground
21776 Rev E 09/16 (800) 234-4239 www.networketi.com 7 of 12Environmental Technology, Inc.
Model EUR–5A Snow & Ice Melting Control
Determining the amount of sensors you can use
The EUR–5A has 46 watts of power available for use between the sensors and contactor. The power
requirement of your contactor will determine the amount watts left available for your sensors.
After determining your contactor's power requirement, subtract that from the 46 available watts, the result will
be your available power for your sensors. You can then take your available power and use that to determine
the number of sensors you can use.
• Each CIT–1 aerial sensor (at least one is required) uses 2.4 watts of power
• Each GIT–1 gutter sensor uses 6 watts of power
• Each SIT–6E pavement sensor uses 6 watts of power
At least one CIT–1 Areal sensor is required for an effective for a snow/ice melt system. Make sure your
combined sensor and contactor's power use does not exceed 46 watts.
Environmental Sensors
The use of sufficient appropriately-placed environmental sensors is important for effective and efficient system
operation. An aerial snow sensor can give the system a head start in protecting against snow or ice buildup,
yielding more consistent protection.
Figure 8 shows connections for a typical pavement snow melting application using both a CIT–1 Aerial Snow
Sensor and a SIT–6E Pavement Sensor. These sensors are all connected in parallel. Use #18 AWG extension
wire for distances up to 1000 ft. (304.8m) and #12 for up to 2000 ft. (609.6m). Running sensor wiring and
power line voltage wiring in the same conduit is not recommended.
No Connection
No Connection
Remote Control Return
Remote Control
emperature Sensor Return
T
No Connection
Temperature Sensor
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
No Connection
24 VAC Return
24 VAC
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
Remote Heater Toggle Return
Remote Heater Toggle
No Connection
Power
Sensor 24 VAC (Red)
Sensor Signal (White)
Sensor Ground (Black)
No Connection
Control Relay Common
Control Relay NO
Control Relay NC
Figure 9.
Temperature limit sensor connection
Equipment Ground
Equipment Ground
No Connection
EMC Heater On
EMC Snow Present
EMC Supply Present
EMC Output Common
EMC Override Off
EMC Override On
EMC Input Common
No Connection
No Connection
No Connection
No Connection
Remote Control Return
Remote Control
No Connection
emperature Sensor Return
T
emperature Sensor
T
1 2 3456
1 2 345678910111213141516171819
High Temperature
Limit Sensor
500 ft. (152.4 m) max,
20 ft. (6 m) supplied
Figure 8. Sensor
CIT–1
Aerial
Snow Sensor
Red
White
Black
Red
White
Black
Red
White
Black
connections for a typical
pavement snow melting
application
SIT–6E
Pavement-Mounted
Sensor
High Temperature Limit Sensor
The high temperature limit sensor is connected across terminals
1 and 2. There is no polarity requirement. See Figure 9.
If the high temperature limit sensor is not used, then a 470k ohm
resistor must be connected in its place, across terminals 1 and 2
of the EUR–5A. This is necessary to allow the EUR–5A to operate
without the sensor. If the circuit is left open, the Heat indicator
on the EUR–5A panel will flash.
8 of 12 Environmental Technology, Inc.
21776 Rev E 09/16(800) 234-4239www.networketi.com
RCU–3 installation
RCU-3
Remote Control
Remote
The RCU–3 remote control unit mounts in
a single gang switch box. It can be located
up to 500 feet (152.4 m) from the EUR–5A
at a location convenient for observing snow
melting system operation.
The RCU–3 connects to the EUR–5A at
terminals 4 and 5. There is no polarity
requirement. See Figure 10.
Figure 10.
RCU–3 remote control connection to EUR–5A
500 ft. (152.4 m) max
20 ft. (6 m) supplied
Model EUR–5A Snow & Ice Melting Control
Energy Management Computer Interface
The EUR–5A provides three contact-closure outputs to the EMC to indicate
operational status with indications of Supply Present, Snow Present, and
Heat On. See Figure 11.
These floating relay contacts share a common connection (terminal 13).
• The SUPPLY PRESENT terminal (14) connects to the common
terminal (13) when the EUR–5A is receiving 24-volt power.
• The SNOW PRESENT terminal (15) connects to the common
terminal (13) when the sensors report the presence of ice or snow.
• The HEATER ON terminal (16) connects to the common terminal
(13) while the heaters are on.
When connecting to ECM connect as follows:
• OVERRIDE ON: when the ECM connects terminals 10 and 11 this
forces the heaters to be on.
• OVERRIDE OFF: when the ECM connects terminals 10 and 12 this
forces the heaters to be off.
These functions are independent of weather conditions and the status of
the hold-on timer. If both are engaged, OVERRIDE OFF prevails.
Figure 11.
EMC interface user connections
Override Off
Override On
Supply
Relay
Snow
Relay
Heat
Relay
Output Common
Remote Heater Toggle Connections
This is for a user-supplied panel-mounted momentary
pushbutton switch for Heater Cycle control. It can be
mounted at a location that may be more convenient
than the EUR–5A panel. The connections are simply
shorted together when the pushbutton is pressed.
There is no polarity requirement. See Figure 12.
21776 Rev E 09/16 (800) 234-4239 www.networketi.com 9 of 12Environmental Technology, Inc.
Remote Heater T
Power
No Connection
24 VAC Return
24 VAC
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
oggle Return
Remote Heater Toggle
No Connection
Sensor 24VAC (Red)
Sensor Signal (White)
Sensor Ground (Black)
No Connection
Control Relay Common
Control Relay NO
Control Relay NC
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
Figure 12.
Heater cycle
switch connection
Heater
Cycle
Switch
Model EUR–5A Snow & Ice Melting Control
Troubleshooting
If there are any problems with system operation, the cause can be located and repaired as follows:
First, verify that all of the wiring connections are secure, and check fuses. Make certain that all EUR–5A terminal
block screws are snugly tightened. Do not overtighten! If this is a new installation, check for wiring errors.
If none of the LED’s on the EUR–5A front panel operate, check for 24 to 28 VAC between terminal block terminals
36 and 37. If the voltage is present, but the Supply light is not on, then the EUR–5A is defective.
If the “HEAT” LED is flashing it indicates that the High Temperature Sensor is not properly connected or the
wiring is open. Check the sensor connection and replace the sensor if necessary. If the sensor is not used,
verify that a 470k resistor is connected from terminal 1 to terminal 2, and the High Temperature Limit control
is set to 90 °F.
The next tests determine whether a sensor or the EUR–5A is defective.
Remove EUR–5A power. Turn temperature limit dial to 90°F. If the ambient temperature is above 85°F (29.4°C),
install a 470k resistor in place of temperature limit thermistor. Remove the wire connected to terminal block
terminal 25 which is the sensor signal connection. Re-apply EUR–5A power. If the Heat LED turns on at this
point, then the EUR–5A is defective.
Connect a short jumper wire between terminal block terminals 25 (sensor signal) and 24 (sensor ground).
Now the Heat LED should turn on within 10 seconds and the control relay should close. If the Heat LED does
not turn on with terminals 24 and 25 connected, then the EUR–5A is defective, if the Heat LED does turn on
there is a problem with your sensors or sensor wiring.
To test the sensors connect only one sensor to the EUR–5A unit and attempt to activate it by cooling the
temperature probe to 38° or colder by using ice water or freeze spray and applying water to the sensor face.
With the sensor registering both cold (38° or colder) and moisture the unit should switch on (this may take
longer if using ice water instead of freeze spray to simulate cold conditions). Repeat this process for all sensors
one at a time.
To test sensor wiring attach a DVM to the ground and signal wire of the sensor at the EUR–5A unit (black and
white wires on CIT–1 and GIT–1 sensors, black and blue wires on the SIT–6E sensor). With the sensor in a dry
condition the connection should read between 22 VDC and 26 VDC. With the sensor in a cold (38° or colder),
wet condition the connection should read between 0 and 2 VDC. If your results are different there is probably
a problem with the wiring.
The EUR–5A does not have user-serviceable parts inside. Hence component-level troubleshooting in the field is
not practical. Checking the basic external functions and components is the correct approach. Contact Customer
Service if this does not identify the problem.
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21776 Rev E 09/16(800) 234-4239www.networketi.com
Ordering Information, Warranty and Service
Ordering Information
Description Part Number
EUR–5A Snow and Ice Melting Control
Accessories
Power Transformer, 50 VA, 120 V to 24 V
RCU–3 Remote Control
Fuse Kit
Sensors (Not Included)
CIT–1 Aerial Snow Sensor
GIT–1 Gutter Ice Sensor
SIT–6E Pavement Mounted Snow/Ice Sensor
Pavement Sensor Housing (Required for SIT–6E)
Contacting Environmental Technology, Inc.
21496
14257
21357
21184
10001
11351
20756
23832
Model EUR–5A Snow & Ice Melting Control
For assistance, contact Customer Service. Office hours are from 8:00 AM until 5:00 PM ET.
Voice (800) 234-4239 (USA and Canada) or (574) 233-1202 (elsewhere)
Fax (888) 234-4238 (USA and Canada) or (574) 233-2152 (elsewhere)
E-mail info@networketi.com
Mail Environmental Technology, Inc.
1850 North Sheridan Street
South Bend, IN 46628
RETURNS AND REPLACEMENT PART PURCHASES
Equipment cannot be returned for credit once it has been installed. Environmental Technology, Inc. will repair or replace faulty
equipment under warranty. Prior to removal of equipment for warranty return, please contact Environmental Technology, Inc.
Technical Support at 800.234.4239 for troubleshooting assistance.
Before returning a unit to Environmental Technology, Inc., obtain a Return Merchandise Authorization from our Customer
Service Department, available between 8:00 a.m. and 5:00 p.m. Eastern Time at 574.233.1202 or 800.234.4239. If possible,
use the original container and packing materials when packing the unit for shipment. It is important to mark the Return
Merchandise Authorization clearly on the outside of the shipping container so that it may be correctly processed upon receipt at
Environmental Technology. For more information about replacement parts or for a replacement Data Sheet or Manual, please
visit www.networketi.com.
LIMITED WARRANTY
ETI’s two year limited warranty covering defects in workmanship and materials applies. Contact Customer Service for complete
warranty information.
DISCLAIMER
Environmental Technology, Inc. makes no representations or warranties, either expressed or implied, with respect to the contents
of this publication or the products that it describes, and specifically disclaims any implied warranties of merchantability or
fitness for any particular purpose. Environmental Technology, Inc. reserves the right to revise this publication, and to make
changes and improvements to the products described in this publication, without the obligation of Environmental Technology,
Inc. to notify any person or organization of such revisions, changes or improvements.
The ETI logo, We Manage Heat, CIT, GIT, and SIT are registered trademarks of Environmental Technology, Inc. EUR and RCU are trademarks
of Environmental Technology, Inc. Copyright © 2014 Environmental Technology, Inc. All rights reserved. Printed in USA.
21776 Rev E 09/16 (800) 234-4239 www.networketi.com 11 of 12Environmental Technology, Inc.
Model EUR–5A Snow & Ice Melting Control
EUR-5A Terminal Connections
Top
Terminal #
1 Temperature Sensor High Temperature Limit Sensor (included)
2 Temperature Sensor Return High Temperature Limit Sensor (included)
3 No Connection
4 Remote Control RCU-3 (included)
5 Remote Control Return RCU-3 (included)
6 No Connection
7 No Connection
8 No Connection
9 No Connection
10 EMC Input Common Remote Control (page 9)
11 EMC Override ON Remote Control (page 9)
12 EMC Override OFF Remote Control (page 9)
13 EMC Output Common Reports this condition to EMC
14 EMC Supply Present Reports this condition to EMC
15 EMC Snow Present Reports this condition to EMC
16 EMC Heater ON Reports this condition to EMC
17 No Connection
18 Equipment Ground
19 Equipment Ground
Label Description
Either terminal works: tied together internally
Terminal #
20 Control Relay NC Normally Closed
21 Control Relay NO
22 Control Relay Common
23 No Connection
24 Sensor Ground Parallel: only one (1) connection required
25 Sensor Signal Parallel: only one (1) connection required
26 Sensor Power Parallel: only one (1) connection required
27 No Connection
28 Remote Heater Toggle External HEAT CYCLE switch
29 Remote Heater Toggle Return External HEAT CYCLE switch
30 No Connection
31 No Connection
32 No Connection
33 No Connection
34 No Connection
35 No Connection
36 24 VAC input power from 24 VAC
37 24 VAC Return input power from 24 VAC
38 No Connection
Label Description
Normally Open. With terminal 21 to terminal 22,
output to heater controller contactor
Bottom
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21776 Rev E 09/16(800) 234-4239www.networketi.com
Model EUR–5A Snow & Ice Melting Control
Specifications
Controls
Heater Cycle Pushbutton Initiates Heat and Hold On Time
Hold-On Time Sets Hold-On Time from 0 to 10 hours
High-Temperature Limit Sets maximum temperature from 40°F to 90°F
(4°C to 32°C) with 1°F (0.6°C) hysteresis.
Indicators
Supply Green LED indicates when 24 V control power is present.
Heat Yellow LED indicates heater output is on.
Snow Yellow LED indicates sensors detect snow or ice.
Inputs
Environmental Sensors 3-terminal connection supplies power to and accepts
and
Temperature Limit Sensor For ETI High Temperature Limit Sensor
Remote Control Unit For ETI RCU-3 Remote Control Unit (ETI 21357, included)
Remote Heat Cycle
EMC Override On Connection to EMC Common will force Heat On.
EMC Override Off Connection to EMC Common will force Heat Off.
Outputs
Heater Control Relay
Max. switching power: 30 W or 62 VA
EMC Supply Contact closure to common; Max. 0.5 A, 200 Vdc, 10 W
EMC Snow Contact closure to common; Max. 0.5 A, 200 Vdc, 10 W
EMC Heat Contact closure to common; Max. 0.5 A, 200 Vdc, 10 W
Power Supply
Power Supply Voltage 24 V +/- 20%; NEC Class 2 power source
Power Consumption 2 W/80 mA (EUR-5A; excluding sensors)
Power Transformer (supplied) 120 V to 24 V, 48 VA max.
Protection Fuse Ratings 2 amps for control unit, sensors, and aux. relay (if used)
Temperature Range
Operating Temperature −40°F (−40°C) to +140°F (+60°C)
Storage Temperature −67°F (−55°C) to +167°F (+75°C)
Mechanical
Enclosure Type DIN mountable
Mounting 35 mm DIN rail or bulkhead
Dimensions
input signals from ETI sensors including CIT-1, GIT-1,
SIT-6E.
(ETI 25076, included). Can be bypassed with 470k resistor.
Allows connection of external pushbutton for Heat Cycle control.
Form C Relay Contact
Resistive Load: 1 A 30 Vdc or 0.5 A 125 Vac
2 amps for separate protection of sensor power
3.95 in. W x 4.31 in. D x 2.96 in. H (100.3mm x 109.5mm x 75.2mm)
RCU-3 Specifications
Controls
Heater Cycle Pushbutton Initiates Heat and Hold Time
Hold-On Time Sets Hold-On Time from 2 to 8 hours
Indicators
Supply Green LED indicates when 24 V control power is present.
Heat Yellow LED indicates heater output is on.
Snow Yellow LED indicates detection of snow or ice.
21776 Rev E 09/16 (800) 234-4239 www.networketi.com 13 of 12Environmental Technology, Inc.
Model EUR–5A Snow & Ice Melting Control
EUR–5A SNOW SWITCH
®
Environmental Technology, Inc.
14 of 12 Environmental Technology, Inc.
networketi.com
We manage heat
®
®
21776 Rev E 09/16(800) 234-4239www.networketi.com
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