Snow controller manual

We manage heat

Model EUR5ASnow and Ice Melting Control

Part Number 21496

Installation and Operation Manual

Environmental Technology, Inc.1850 N Sheridan StreetSouth Bend, Indiana 46628(574) 233-1202 or (800) 234-4239FAX (574) 233-2152 or (888) 234-4238http://www.networketi.com/

DISCLAIMEREnvironmental 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.

Copyright 2008 Environmental Technology, Inc. All rights reserved. No part of this manual may be reproduced or translated in any form or by any means, electronic or mechanical including photocopying and recording, for any purpose without the express written consent of Environmental Technology, Inc.

The ETI logo, We Manage Heat, CIT, GIT, and SIT are reg is tered trademarks of En vi ron men tal Technology, Inc. EUR and RCU are trademarks of Environmental Technology, Inc.

PN21776 rev B 11/08Printed in USA

of 27

Table of ContentsSafety 7Contacting Environmental Technology 7

General 7Introduction 7Environmental Interfaces 8Building Energy Management Computer (BEMC) Interface 9Operator Interfaces 9

EUR5A Front Panel 9Pushbutton Switch 9RCU3 Remote Control Unit 9

Power Source 10Contactor Interface 10Specifi cations 10

Operation 12Local Control from the EUR5A 12Remote Control from the RCU3 12Remote Control from the BEMC 13Panel-Mounted Switch 13

Installation 14First 14Next 14Pro Forma Packing List 14Location 14Mechanical 14Connections 14

Safety Information 14Power Source and Contactor Connections 14Environmental Sensors Connections 17Temperature Limit Sensor Connections 17RCU3 Remote Control Connections 18BEMC Interface Connections 18Heater Cycle Switch Connections 19

Continued...

of 27

Maintenance 20General 20Troubleshooting 20Returns 20

Table of Contents

of 27

Index of FiguresFigure 1. Typical EUR5A installation. 8Figure 2. EUR5A 15Figure 3. Power and contactor connections. 16Figure 4. Sensor connections for a typical pavement snow melting application. 16Figure 5. Temperature limit sensor connection. 17Figure 6. RCU3 Remote Control connection. 18Figure 7. BEMC interface connection. 18Figure 8. Heater cycle switch connection. 19Appendix A. Typical EUR5A Installation. 21Appendix B. EUR5A 22Appendix C. Power and Contactor Connections. 23Appendix D. Sensor Connections, Typical. 24Appendix E. Temperature Limit Sensor Connections. 25Appendix F. RCU3 Remote Control Connections. 26Appendix G. Heater Cycle Switch Connections. 27

of 27

SafetyMake all electrical connections in compliance with the National Electric Code (NFPA 70)

and local electrical code. If you have questions concerning the installation or application, contact Customer Service.

Contacting Environmental TechnologyFor assistance, contact Customer Service. Office hours are 8:00 AM until 5:00 PM EST.

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: [email protected]

Mail: Environmental Technology, Inc.

1850 North Sheridan Street

South Bend, IN 46628

GeneralIntroduction

The EUR5A Snow and Ice Melting Control is the interface between environmental sensors, building energy management computer (if present), operating personnel and the heater control contactors. Figure 1 shows a typical snow melting system using an EUR5A. Currently, compatible environmental sensors are available for pavement, aerial and gutter snow and ice melting applications. A special sensor measures ambient temperature.

Using at least two environmental sensors, as shown in Figure 1, improves performance through superior coverage. A single environmental sensor can miss tracked or blowing and drifting snow. The first environmental sensor detecting snow or ice starts the heaters. When both environmental sensors become clear of snow and ice, the heater hold-on interval begins. The EUR5A accommodates up to eight environmental sensors.

During hold-on, heater operation continues for an adjustable time interval.

This serves the purposes of melting any accumulated snow and ice and drying the pavement. Re-freezing can create hazardous conditions.

The EUR5A includes an adjustable high temperature limit thermostat. This feature is useful in systems using MI cable and other constant wattage heaters to prevent excessive temperatures. When using self-limiting heaters, this feature can be defeated.

Typically, the EUR5A is located in an electrical enclosure housing heater contactors

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which is not convenient for operating personnel or accessible to laymen. Supervisory control is sometimes necessary due to the need for testing and unusual environmental conditions which can include blowing, drifting and tracked snow. The EUR5A itself provides control and indicators for this purpose. However, accessing them requires opening the electrical enclosure thus exposing lethal voltages. This problem is avoided through the use of the RCU3 Remote Control Unit which is included. Another simple alternative is to mount a customer supplied pushbutton switch in the electric panel door for cycling the hold-on timer.

Environmental InterfacesThe EUR5A determines when to start heater operation by monitoring the signals produced

by up to six environmental customer supplied sensors paralleled together using a three-wire bus. Available sensors include:

SIT6E Pavement Mounted Snow and Ice Sensor CIT1 Aerial Snow and Ice Sensor GIT1 Gutter Snow and Ice Sensor

The EUR5A includes a temperature sensor for measuring air or pavement slab

RCU3Remote Control

TemperatureLimit Sensor

Must be installed for proper operation.

CIT1Aerial Snow Sensor

SIT6EPavement-Mounted Sensor

EUR5ASnow Switch

EquipmentGround

Building/EnergyManagement

Computer Interface

RemoteHeaterCycle

Contacts

CR-1-1

CR-1CR-2

120 VAC50 VA

HeaterControl

Contactor

AuxiliaryRelay

Figure 1. Typical EUR5A installation.

of 27

temperature. This sensor is required for proper operation of the unit. Its signal is used to provide an adjustable high limit thermostat function. This feature is essential when using a potentially high temperature heater such as MI cable.

Building Energy Management Computer (BEMC) InterfaceThe EUR5A interfaces a BEMC via relays. Inputs from the BEMC include: OVERRIDE

ON which causes heater operation and OVERRIDE OFF which inhibits heater operation. These functions are independent of weather conditions and the status of the hold-on timer. The EUR5A provides three system status contact closures for the BEMC including SUPPLY, SNOW and HEATER. The SUPPLY relay contact closes on the absence of power since it is reverse acting.

Absent signals from the BEMC, the EUR5A controls the heaters based upon environmental conditions. Automatic snow melting control is the default condition of the system.

Operator InterfacesEUR5A Front Panel

The EUR5A has indicators, adjustments, and a switch for local control of the snow melting system. These include:

SUPPLY indicator SNOW indicator HEAT indicator HEATER CYCLE pushbutton switch HOLD-ON time adjustment with a range of 0 to 10 hours and off HIGH-LIMIT temperature adjustment with a range of 40 to 90 F (4 to 32 C)

Figure 2 shows the EUR5A front panel layout.

Pushbutton SwitchThe EUR5A provides an interface for a customer-supplied pushbutton switch which

initiates the hold-on timer for the interval set by the EUR5A. This switch also resets the hold-on timer if it is running. Typically, this switch is located on the door of the electrical enclosure. This feature is optional.

RCU3 Remote Control UnitEach EUR5A includes an RCU3 for monitoring the snow melting and controlling

system operation from a convenient observation point. This accommodates unusual environment conditions that could result in heater operation being terminated before the snow was completely cleared and the pavement dry. The RCU3 provides both a heater hold-on switch and an

of 27

independent hold-on time interval adjustment.

The RCU3 provides the following indicators, switches and adjustments: POWER indicator (green) HEATER indicator (yellow) HEATER CYCLE switch HOLD-ON time adjustment (two to eight hours in two hour steps)

Figure 3 shows the front panel layout. The Class 2 for wet locations RCU3 mounts in a single gang switch box up to 500 feet from the EUR5A at a location convenient for observing snow melting system operation.

Power SourceThe EUR5A operates from a 24 volt AC NEC Class 2 power source. A 120 to 24 volt 50

VA control transformer is included for this purpose.

Contactor InterfaceSince the EUR5A is a NEC Class 2 device, it usually requires a customer supplied

auxiliary relay for operating the heater control contactor solenoids.

Specifi cationsEnvironmental Interfaces

Environmental Sensors Up to 6 sensors from the CIT1/GIT1/SIT6E family.Temperature Limit Sensor ETI P/N 19272 Thermistor Temperature Sensor. Locate up to 2,000' (610 meters) from

the EUR5A. Can be eliminated by substituting a fixed resistor for the P/N 19272 (contact Customer Service for additional information)

Building Energy Management InterfaceInputs are relay coils operating from 5 VDC at 0.05 amps (nominal) OVERRIDE ON OVERRIDE OFFOutputs are relay contacts rated at up to 24 VAC or VDC at 0.05 amps SUPPLY SNOW HEAT

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Operator InterfacesEUR5A Snow and Ice Melting Control Indicators SUPPLY

SNOWHEAT

Adjustments HOLD-ON TIME: 0 to 10 hoursHIGH-LIMIT TEMPERATURE: 40 to 90F (4 to 32C) with a 0.5 F ( 0.3C) dead-band

Control HEATER CYCLE: operates heaters for the hold-on time

Panel-mounted Switch Electrical interface for a SPST dry-circuit panel-mounted switch

RCU3 Remote Control Unit Locate up to 500' (152 Meters) from the EUR5A Indicators SUPPLY

HEAT Adjustment HOLD-ON TIME: 2 to 8 hours Control HEATER CYCLEContactor Interface SPDT Class 2 pilot duty relay contact rated at 1 ampPower Requirements NEC Class 2 source of 24 VAC 2 volt-amps (nominal)Temperature Ranges Operating: 40F (40C) to +140F (+60C) Storage: 67F (55C) to +167F (+75C)Mechanical NEMA 1 housing 35 MM DIN rail or bulkhead mounting Size is 4" W by 47/8" D by 3" H

of 27

OperationThe snow melting system can be monitored and controlled either locally from the EUR5A

itself or from two remote locations including: RCU3 Remote Control Unit BEMCA third remote option uses a customer-supplied switch to toggle the heaters on for the hold-

on time from the front panel of the electrical enclosure.

Local Control from the EUR5AIndicators:

SUPPLY (green) shows that power is present SNOW (yellow) shows that it is snowing HEAT (yellow) shows that there is a call for heat. This happens during snow and for

the hold-on time thereafter or when the heater cycle switch is operated. Please note, if thermistor temperature exceeds the setting on the temperature limit dial, the heaters will shut off; the hold-on timer remains active.

Adjustments: HOLD-ON TIME adjustment sets the time that heaters operate after snow stops. Doing

this is necessary to make certain the pavement dries before heating ceases. This prevents re-freezing. Try an initial setting of 5 hours. Increase, if necessary. Reduce with care since energy savings are being traded for an increased likelihood of re-freezing.

HIGH-LIMIT TEMPERATURE adjustment sets the maximum deicing temperature.

Remote Control from the RCU3The location for the RCU3 is chosen for convenient observation of snow melting system

operation. It monitors snow melting and permits overriding automatic control in the event that heating terminates before the pavement is dry. The SUPPLY indicator shows that power is available for the snow melting system while the HEAT indicator operates with the snow melting heaters.

The HOLD-ON TIME adjustment sets the heater operating time in a 2 to 8 hour range. The range of this adjustment is independent of its equivalent on the EUR5A for flexibility.

Operating the HEATER CYCLE switch causes snow melting heater operation for the HOLD-ON TIME adjustment setting. Using this switch during hold-on turns the heaters off.

If the heaters turn off before the pavement is dry, operate the HEATER CYCLE switch. This continues heater operation for the HOLD-ON TIME. A trial HOLD-ON TIME of 4 hours is suggested. If the pavement dries during the hold-on interval, operate the HEATER CYCLE

of 27

switch to turn the heaters off. Adjust the HOLD-ON TIME in steps of plus or minus two hours to optimize heater operation.

Remote Control from the BEMCOperation of this interface is defined in the Specifications section of this manual.

Panel-Mounted SwitchOperating this switch initiates heater operation for the hold-on time set by the EUR5A. If

operated during the hold-on time, heater operation is terminated.

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InstallationFirst

Inspect the package and its contents for damage. In the event of damage, immediately contact Environmental Technology, Inc. Customer Service.

NextCheck the contents of the package against the pro forma Packing List shown below. If

discrepancies are found, contact ETI Customer Service before starting the installation.

Pro Forma Packing ListOrder Number Quantity Description

21496 1 EUR5A Snow and Ice Melting Control19272 1 Temperature Limit Sensor14257 1 Power Transformer, 50 VA21357 1 RCU3 Remote Control21776 1 EUR5A Installation and Operation Manual

LocationThe EUR5A requires a protected unheated location suitable for a NEMA1 enclosure. The

electric panel housing the heater control contactors is an ideal location.

MechanicalFigure 2 shows a mechanical outline drawing of the EUR5A. It mounts in 35 MM DIN

rail (customer supplied). Optionally, the DIN rail locking mechanism can be removed from the bottom of the enclosure for direct panel mounting. For convenience, leave a generous space for wiring connections.

ConnectionsSafety Information

The EUR5A is a NEC Class 2 device as are the sensors and remote control accessory devices. The electric panel location creates exposure to lethal voltages. Make certain that the installation adheres to applicable sections of the NEC.

Power Source and Contactor ConnectionsFigure 3 shows power and contactor connections for a typical installation. If your

of 27

HOURS0

2

4 6

8

10

TEMPERATURE

40F 90F

50F

60F 70F

80 F

HEATERCYCLE

South Bend, Indiana 46601www.networketi.com

EUR5A Snow SwitchAutomatic Snow/Ice Melting Control PanelPart Number 21496

24 V

AC Re

turn

24 V

ACNo

Con

nec

tion

No C

onn

ectio

nNo

Con

nec

tion

No C

onn

ectio

nNo

Con

nec

tion

No C

onn

ectio

nRe

mot

e He

ater

Togg

le Re

turn

Rem

ote

Heat

er To

ggle

No C

onn

ectio

nSe

nso

r Pow

er (R

ed)

Sen

sor S

ign

al (W

hite

)Se

nso

r Gro

und

(Blac

k)No

Con

nec

tion

Con

trol R

elay

Com

mon

Con

trol R

elay

NO

No C

onn

ectio

n

Con

trol R

elay

NC

38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20

Equipment Ground

No Con

nection

EMC Heater On

EMC Sno

w Present

EMC Supply Present

EMC Output C

om

mon

EMC O

verride Off

EMC O

verride OnEM

C Input Co

mm

on

No Con

nection

No Con

nection

No Con

nection

No Con

nection

Remote

Co

ntrol ReturnRem

ote Co

ntrolNo C

onn

ection Tem

perature Sensor Return

Equipment Ground

Temperature Sen

sor

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Figure 2. EUR5A

of 27

CR-1-1CR-1

CR-2

120 VAC50 VA

HeaterControl

Contactor

AuxiliaryRelay

24 V

24 V

olts

Aol

ts A

C R

etur

C R

etur

n

24 V

24 V

olts

Aol

ts A

C

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

Rem

ote

Hea

ter

Togg

le R

etur

n

Rem

ote

Hea

ter

Togg

le

No

Con

nect

ion

Sen

sor

Sup

ply

(Red

)

Sen

sor

Sup

ply

(Whi

te)

Sen

sor

Sup

ply

(Bla

ck)

No

Con

nect

ion

Con

trol

Rel

aC

ontr

ol R

elay

Com

mon

y C

omm

on

Con

trol

Rel

aC

ontr

ol R

elay

NO

y N

O

No

Con

nect

ion

Con

trol

Rel

aC

ontr

ol R

elay

NC

y N

C

38 3737 3636 35 34 33 32 31 30 29 28 27 26 25 24 23 2222 2121 2020

Pow

er

Red

White

Black

Red

White

Black

Red

Whi

te

Bla

ck

24 V

AC

Ret

urn

24 V

AC

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

Rem

ote

Hea

ter

Togg

le R

etur

n

Rem

ote

Hea

ter

Togg

le

No

Con

nect

ion

Sen

sor

24 V

AC

(Red

)

Sen

sor

Sig

nal (

Whi

te)

Sen

sor

Gro

und

(Bla

ck)

No

Con

nect

ion

Con

trol

Rel

ay C

omm

on

Con

trol

Rel

ay N

O

No

Con

nect

ion

Con

trol

Rel

ay N

C

38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20

CIT1Aerial Snow Sensor

SIT6EPavement-Mounted Sensor

Pow

er

Figure 3. Power and contactor connections.

Figure 4. Sensor connections for a typical pavement snow melting application.

of 27

installation is atypical, Customer Service is available for assistance at no cost.

Environmental Sensors ConnectionsFigure 4 shows connections for a typical pavement snow melting application using both a

CIT1 Aerial Snow Sensor and a SIT6E Embedded Sensor. Up to six sensors can be used with a single EUR5A. Use #18 AWG extension wire for distances up to 250' and #14 for up to 1,000'. Running sensor and line voltage wiring in the same conduit is not recommended.

Ambient/Slab Temperature Sensor Connections

Temperature Limit SensorETI P/N 19272

Eq

uipm

ent Ground

No C

onnection

EM

C H

eater On

EM

C S

now P

resent

EM

C S

upp

ly Present

EM

C O

utput C

omm

on

EM

C O

verride O

ff

EM

C O

verride O

n

EM

C Inp

ut Com

mon

No C

onnection

No C

onnection

No C

onnection

No C

onnection

Rem

ote Control R

eturn

Rem

ote Control

No C

onnection

T Temp

erem

perature S

ensor Retur

ature Sensor R

eturn

Eq

uipm

ent Ground

Temp

erem

perature S

ensorature S

ensor

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

2,000' (609.6m) max, 20' (6m) supplied

No C

onnection

No C

onnection

Rem

ote Control R

eturn

Rem

ote Control

No C

onnection

T Temp

erem

perature S

ensor Retur

ature Sensor R

eturn

Temp

erem

perature S

ensorature S

ensor1 2 3 4 5 6

Figure 5. Temperature limit sensor connection.

NOTE: The Ambient/Slab Temperature Sensor or a 470 K ohm resistor is required across terminal 1 and 2 for the unit to properly operate.

of 27

RCU3 Remote Control Connections

RCU3 Remote ControlETI P/N 21357

Eq

uipm

ent Ground

No C

onnection

EM

C H

eater On

EM

C S

now P

resent

EM

C S

upp

ly Present

EM

C O

utput C

omm

on

EM

C O

verride O

ff

EM

C O

verride O

n

EM

C Inp

ut Com

mon

No C

onnection

No C

onnection

No C

onnection

No C

onnection

Rem

ote Control R

eturR

emote C

ontrol Return

Rem

ote Control

Rem

ote Control

No C

onnection

Temp

erature Sensor R

eturn

Eq

uipm

ent Ground

Temp

erature Sensor

1 2 3 44 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

S3

R3

R2

R1

D2

YEL

D1

GRN

R4

J1

2,000' (609.6m) max, 20' (6m) supplied

Figure 6. RCU3 Remote Control connection.

BEMC Interface Connections

Eq

uipm

ent Ground

No C

onnection

EM

C H

eater On

EM

C H

eater On

EM

C S

noE

MC

Snow

Present

w P

resent

EM

C S

upp

ly Present

EM

C S

upp

ly Present

EM

C O

utput C

omm

onE

MC

Outp

ut Com

mon

EM

C O

vE

MC

Overrerrid

e Off

ide O

ff

EM

C O

vE

MC

Overrerrid

e On

ide O

n

EM

C Inp

ut Com

mon

EM

C Inp

ut Com

mon

No C

onnection

No C

onnection

No C

onnection

No C

onnection

Rem

ote Control R

eturn

Rem

ote Control

No C

onnection

Temp

erature Sensor R

eturn

Eq

uipm

ent Ground

Temp

erature Sensor

1 2 3 4 5 6 7 8 9 1010 1111 1212 1313 1414 1515 1616 17 18 19

BEMC

8

Figure 7. BEMC interface connection.

of 27

Heater Cycle Switch ConnectionsRemote HeaterCycleSwitch

24 V

AC

Ret

urn

24 V

AC

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

No

Con

nect

ion

Rem

ote

Hea

ter

TR

emot

e H

eate

r To

ggle

Ret

urog

gle

Ret

urn

Rem

ote

Hea

ter

TR

emot

e H

eate

r To

ggle

oggl

e

No

Con

nect

ion

Sen

sor

24VA

C (R

ed)

Sen

sor

Sig

nal (

Whi

te)

Sen

sor

Gro

und

(Bla

ck)

No

Con

nect

ion

Con

trol

Rel

ay C

omm

on

Con

trol

Rel

ay N

O

No

Con

nect

ion

Con

trol

Rel

ay N

C

38 37 36 35 34 33 32 31 30 2929 2828 27 26 25 24 23 22 21 20

Pow

er

Figure 8. Heater cycle switch connection.

of 27

Maintenance General

The EUR5A contains no field replaceable components. Defective units must be returned to ETI for repair or replacement.

TroubleshootingAlthough the EUR5A is a relatively simple device electronically, troubleshooting is

complicated by the multiplicity of features provided by this product. Hence component-level troubleshooting in the field is not practical. Checking only basic functions is the correct approach. Contact Customer Service if this does not identify the problem.

First, check the installation for security. Make certain that all EUR5A terminal block screws are snugly tightened. Do not over-tighten! If this is a new installation, check for wiring errors and similar problems.

If none of the LEDs on the EUR5A front panel operate, check for 24 to 28 VAC between terminal block terminals 36 and 37. If the voltage is present, the EUR5A is defective.

If the "HEAT" LED is flashing it indicates that the Ambient/Slab Temperature Sensor is not properly connected. Check the sensor connection and replace the sensor if necessary.

The next tests determine whether a sensor or the EUR5A is defective. Remove EUR5A power. Turn temperature limit dial to 90; if ambient temperature is above 85, install 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 EUR5A power. If the Control Relay operates, the EUR5A is defective. Connect a short jumper wire between terminal block terminals 25 (sensor signal) and 24 (sensor ground). The Control Relay should close within 10 seconds or the EUR5A is defective.

ReturnsContact Customer Service to obtain a Return Authorization before shipment to

Environmental Technology, Inc. Otherwise, the shipment may be refused.

of 27

Appendix A. Typical EUR5A Installation.R

CU

3R

emot

e C

ontro

l

Tem

pera

ture

Lim

it S

enso

r

Mus

t be

inst

alle

d fo

r pr

oper

ope

ratio

n.

CIT

1A

eria

l Sno

w S

enso

r

SIT

6EP

avem

ent-M

ount

ed S

enso

EUR

5A

Sno

w S

witc

h

Equ

ipm

ent

Gro

und

Bui

ldin

g/E

nerg

yM

anag

emen

tC

ompu

ter I

nter

face

Rem

ote

Hea

ter

Cyc

leC

onta

cts

CR

-1-1

CR

-1C

R-2

120

VAC

50 V

A

Hea

ter

Con

trol

Con

tact

or

Aux

iliar

yR

elay

of 27

HOURS0

2

4 6

8

10

TEMPERATURE

40F 90F

50F

60F 70F

80 F

HEATERCYCLE

South Bend, Indiana 46601www.networketi.com

EUR5A Snow SwitchAutomatic Snow/Ice Melting Control PanelPart Number 21496

24 V

AC Re

turn

24 V

ACNo

Con

nec

tion

No C

onn

ectio

nNo

Con

nec

tion

No C

onn

ectio

nNo

Con

nec

tion

No C

onn

ectio

nRe

mot

e He

ater

Togg

le Re

turn

Rem

ote

Heat

er To

ggle

No C

onn

ectio

nSe

nso

r Pow

er (R

ed)

Sen

sor S

ign

al (W

hite

)Se

nso

r Gro

und

(Blac

k)No

Con

nec

tion

Con

trol R

elay

Com

mon

Con

trol R

elay

NO

No C

onn

ectio

n

Con

trol R

elay

NC

38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20

Equipment Ground

No Con

nection

EMC Heater On

EMC Sno

w Present

EMC Supply Present

EMC Output C

om

mon

EMC O

verride Off

EMC O

verride OnEM

C Input Co

mm

on

No Con

nection

No Con

nection

No Con

nection

No Con

nection

Remote

Co

ntrol ReturnRem

ote Co

ntrolNo C

onn

ection Tem

perature Sensor Return

Equipment Ground

Temperature Sen

sor

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Appendix B. EUR5A

of 27

Appendix C. Power and Contactor Connections.

CR

-1-1

CR

-1

CR

-2

120

VAC

50 V

A

Hea

ter

Con

trol

Con

tact

or

Aux

iliar

yR

elay

24 V 24 Volts A olts AC Retur C Return

24 V 24 Volts A olts AC

No Connection

No Connection

No Connection

No Connection

No Connection

No Connection

Remote Heater Toggle Return

Remote Heater Toggle

No Connection

Sensor Supply (Red)

Sensor Supply (White)

Sensor Supply (Black)

No Connection

Control Rela Control Relay Common y Common

Control Rela Control Relay NO y NO

No Connection

Control Rela Control Relay NC y NC

383737

363635

3433

3231

3029

2827

2625

2423

22222121

2020

Power

of 27

Appendix D. Sensor Connections, Typical.

Red

Whi

te

Bla

ck

Red

Whi

te

Bla

ck

Red

White

Black

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

Sensor 24 VAC (Red)

Sensor Signal (White)

Sensor Ground (Black)

No Connection

Control Relay Common

Control Relay NO

No Connection

Control Relay NC

3837

3635

3433

3231

3029

2827

2625

2423

2221

20

CIT1

Aer

ial S

now

Sen

sor

SIT6E

Pav

emen

t-Mou

nted

Sen

sor

Power

of 27

Appendix E. Temperature Limit Sensor Connections.

Tem

pera

ture

Lim

it S

enso

rE

TI P

/N 1

9272

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

T Temperemperature Sensor Returature Sensor Return

Equipment Ground

Temperemperature Sensorature Sensor 12

34

56

78

910

1112

1314

1516

1718

19

2,00

0' (6

09.6

m) m

ax,

20' (

6m) s

uppl

ied

No Connection

No Connection


Remote Control

No Connection

T Temperemperature Sensor Returature Sensor Return

Temperemperature Sensorature Sensor 12

34

56

of 27

Appendix F. RCU3 Remote Control Connections.

RC

U3

Rem

ote

Con

trol

ETI

P/N

213

57

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 ReturRemote Control Return

Remote ControlRemote Control

No Connection

Temperature Sensor Return

Equipment Ground

Temperature Sensor 12

344

56

78

910

1112

1314

1516

1718

19

S3

R3

R2

R1

D2

YEL

D1

GRN

R4

J1

2,00

0' (6

09.6

m) m

ax,

20' (

6m) s

uppl

ied

of 27

Appendix G. Heater Cycle Switch Connections.

Equipment Ground

No Connection

EMC Heater OnEMC Heater On

EMC SnoEMC Snow Presentw Present

EMC Supply PresentEMC Supply Present

EMC Output CommonEMC Output Common

EMC OvEMC Overrerride Offide Off

EMC OvEMC Overrerride Onide On

EMC Input CommonEMC Input Common

No Connection

No Connection

No Connection

No Connection


Remote Control

No Connection

Temperature Sensor Return

Equipment Ground

Temperature Sensor 12

34

56

78

91010

11111212

13131414

15151616

1718

19

BE

MC

8

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/Description > /Namespace [ (Adobe) (Common) (1.0) ] /OtherNamespaces [ > /FormElements false /GenerateStructure true /IncludeBookmarks false /IncludeHyperlinks false /IncludeInteractive false /IncludeLayers false /IncludeProfiles true /MultimediaHandling /UseObjectSettings /Namespace [ (Adobe) (CreativeSuite) (2.0) ] /PDFXOutputIntentProfileSelector /NA /PreserveEditing true /UntaggedCMYKHandling /LeaveUntagged /UntaggedRGBHandling /LeaveUntagged /UseDocumentBleed false >> ]>> setdistillerparams> setpagedevice

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