Ouellet ETO2 User Manual

67221 12/13 (JRK)

© 2013 OJ Electronics A/S

Type ETO2

Controller for ice and snow melting

English
Français

GREEN COMFORT

Maximum comfort with low energy consumption

© 2013 OJ Electronics A/S

English

Instruction

ETO2 is an electronic controller for fully automatic, economical
ice and snow melting on outdoor surfaces and in gutters.
Ice forms due to a combination of low temperature and
moisture. ETO2 detects both temperature and moisture, and the
ice and snow melting system will usually only be activated if ice
or snow is present. ETO2 is suitable for controlling both electric
heating cables and hydronic heating pipes.

Product programme

ETO2-4550 Thermostat.
ETOG-55 Ground sensor for detecting temperature

and moisture.

ETOG-56/ETOK-1 Embedded ground sensor for detecting

temperature and moisture.
ETOR-55 Gutter sensor for detecting moisture.
ETF-744/99 Outdoor sensor for detecting temperature.
ETF-522 Water pipe sensor for detecting

temperature.

WARNING! – Read this manual!

Carefully read this instruction manual in its entirety,
paying close attention to all the warnings listed below. Make
sure that you fully understand the use, displays and limitations
of the controller because any confusion resulting from
neglecting to follow this instruction manual, or from improper
use of the device it concerns, may cause an installer to commit
errors which could lead to ice and snow conditions capable of
causing serious injury or death.

WARNING! – Note that snow, ice and icicles may be

present even though you follow the instructions
contained in this manual.

You are strongly advised to monitor any unexpected build-up of
snow, ice or icicles. As an additional safety measure, you should
always perform a manual inspection of public areas in order to
ensure safe access to the controlled areas.

WARNING! – Important safety instructions.

Disconnect the power supply before carrying out
any installation or maintenance work on this control unit and

associated components. This control unit and associated
components should only be installed by a competent person
(i.e. a qualified electrician). Electrical installation must be in
accordance with appropriate statutory regulations.

NOTE! – The output relays are potential free. The
installer must connect a power source, e.g. from an

electrical panel.

CE MARKING FOR EU

OJ Electronics A/S hereby declares that the product is
manufactured in accordance with Council Directive 2004/108/
EC on electromagnetic compatibility (and subsequent
amendments) and Council Directive 2006/95/EEC on electrical
equipment designed for use within certain voltage limits.

Applied standards

ETO2-4550-EU28: CE marking LVD/EMC: EN60730-2-9
ETO2-4550-US28: CAN/CSA E 60730-2-9:01.
ETO2-4550-RU28: CE marking LVD/EMC: EN60730-2-9

The product may only be used if the complete installation
complies with current directives.
The product carries a manufacturer’s warranty if installed in
accordance with these instructions and current regulations.
If the product has been damaged in any way, e.g. during
transport, it must be inspected and checked by authorised
personnel before being connected to the power supply.

TECHNICAL DATA

Thermostat ETO2-4550:

Designed for indoor mounting only!

Supply voltage ............................115/240 V AC ±10%, 50-60 Hz

Supply voltage for ETOG/ETOR heating (SMPS) ..28 V DC, 8 VA

3 output relays (potential-free contact, NO) ...................3 X 16 A

Alarm relay (potential-free contact, NO) ........................ max. 5 A

Control signal to actuator (mixing valve) .....................0-10 V DC

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© 2013 OJ Electronics A/S

INSTRUCTION

Type ETO2

English / Instruction

Supply voltage to actuator

(mixing valve) .................................max. 48 V AC/DC / max. 2 A

On/o dierential ........................................................1.8°F / 1°C

Temperature range ....................................-4/+50°F / -20/+10°C

Ambient temperature .................................... 32/122°F / 0/+50°C

Ambient air humidity .......................................................10-95%

Enclosure rating .....................................................

Weight .............................................................

Nema 1- IP 20

17.46 oz - 600 g

Dimensions H/W/D ...........3.54/6.14/1.77 Inches - 90/156/45 mm

Type ................................................................................. 1B

Control pollution degree ............................................................2

Rated impulse voltage .......................................................... 4 kV

Ground sensor - type ETOG-55:

Designed to be embedded in outdoor surfaces.

Detection ............................................ Moisture and temperature

Mounting ..........................................................Outdoor surfaces

Enclosure rating .................................................

NEMA 6P - IP 68

Ambient temperature ............................. -57/+158°F / -50/+70°C

Dimensions

H/Ø................................1.26/2.36 Inches - 32/60 mm

Ground sensor - ETOG-56/ETOK-1:

Designed to be embedded in outdoor surfaces.

Detection ........................................... Moisture and temperature

Mounting .........................................................Outdoor surfaces

Enclosure rating .................................................

NEMA 6P - IP 68

Ambient temperature ............................. -57/+158°F /-50/+70°C

Dimensions, sensor H/Ø .................

1.26/2.36 Inches - 32/60 mm

Dimensions, tube H/Ø ...................3.07/2.50 Inches - 78/63,5 mm

Gutter sensor - type ETOR-55:

Designed to be mounted in gutter or downpipe. Is used together
with outdoor sensor type ETF-744/99.

Detection ........................................................................Moisture

Mounting ...................................................... Gutter or downpipe

Enclosure rating .................................................

NEMA 6P - IP 68

Ambient temperature ............................. -57/+158°F / -50/+70°C

Dimensions H/W/D ...........

4.13/1.18/0.51 Inches - 105/30/13 mm

Outdoor sensor - ETF-744/99:

Detection ................................................................. Temperature

Mounting ...............................................................................Wall

Enclosure rating ...................................................

NEMA 3 - IP 54

Ambient temperature ............................. -57/+158°F / -50/+70°C

Dimensions H/W/D .............

3.39/1.77/1.38 Inches - 86/45/35 mm

Water pipe sensor - ETF-522:

Detection ................................................................. Temperature

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Mounting ...........................................................Strapped to pipe

Enclosure rating ...................................................

NEMA 3 - IP 54

Ambient temperature ........................... -40/+248°F / -40/+120°C

Dimensions

Ø/L ...............................0,26/1.97 Inches - 6,5/50 mm

NOTE: The snow and ice melting system is deactivated
in the event of sensor failure - regardless of sensor type.

SENSOR INSTALLATION

Ground sensor - ETOG, figs 1+3:

For installation in outdoor surfaces where ice and snow are a
regular problem. The sensor must be embedded horizontally
with its top flush with the surrounding surface.
The sensor cable must be installed in accordance with current
regulations.
NOTE: We strongly recommend the use of cable pipes in order
to protect the sensor cable. Detailed installation instructions are
supplied with the sensor.

With ETOG-55, use the accompanying installation plate.
With ETOG-56, use the ETOK-1 mounting kit.

NOTE: Remove the installation plate from ETOG-55
before initial start-up.

Gutter sensor - ETOR, figs 2+4:

For installation in a gutter or downpipe on the sunny side of
the building. It is important to ensure that the sensor contact
elements face against the flow of melt water. If necessary,
two sensors can be installed in parallel. Detailed installation
instructions are supplied with the sensor.

Note that the pink and grey wires are not used.

Outdoor sensor - ETF-744/99, figs 2+4:

Although ETF is designed for use with gutter sensor ETOR, it
can also be used separately for the detection of temperature
alone. The sensor should be mounted on the wall beneath the
eaves on the north side of the building.

Water pipe sensor - ETF-522:

Is only used with hydronic heating systems to detect the
temperature of the supply and return water. Must be fastened to
the pipe directly with strips.

Sensor cables:

With the exception of ETOG-56, which has a
cable, ETOG and ETOR sensors are supplied with a

32.8 ft (10 m)

82.02 ft

© 2013 OJ Electronics A/S

Type ETO2

(25 m) cable, which can be extended up to approx. 656 ft - (200
m) using standard installation cable:
ETOG and

4x16 AWG (4x1.5 mm² ) for ETOR. The ETF cable can

be extended up to approx.

6x16 AWG (6x1.5 mm² ) for

164 ft (50 m) in length. Sensor cables

must be installed in accordance with current regulations. They
must never be installed parallel to power cables as electrical
interference may distort the sensor signal.

ETO2:

The unit is intended to be DIN-rail mounted in an approved
panel.
Wall mounting:

For USA and Canada: The thermostat can be wall-mounted in a
specially designed and UL-approved metal box (accessory).

The accompanying plastic cover can be used for wall mounting
in an indoor area.
Connect supply voltage to terminals N and L. All electrical and
mechanical installation must be performed in accordance with
applicable local regulations.

SETUP, ELECTRIC HEATING

• 1-zone electric heating control with ETOG (figs 3+6):
Connect 1 or 2 ETOG sensors to terminals 11-20.
Connect heating cable to potential-free output relays 1, 2 and

3 according to fig. 8.

• 1-zone electric heating control with ETOR + ETF

(figs 4+7):

Connect 1 or 2 ETOR sensors to terminals 11-20.

Note that the pink and grey wires are not used.
Connect 1 ETF sensor to terminals 31-32.
Connect heating cable to potential-free output relays 1, 2 and

3 according to fig. 8.

• 2-zone electric heating control with ETOG (figs 3+6):
Connect 2 ETOG sensors to terminals 11-20.

Connect heating cable for zone 1 to potential-free output

relay 1 according to fig. 8.
Connect heating cable for zone 2 to potential-free output

relay 2 according to fig. 8.

• 2-zone electric heating control with ETOR (figs 4+7):

Connect 2 ETOR sensors to terminals 11-20.

Note that the pink and grey wires are not used.
Connect heating cable for zone 1 to potential-free output

English / Instruction

relay 1 according to fig. 8.

Connect heating cable for zone 2 to potential-free output

relay 2 according to fig. 8.

• 2-zone electric heating control with ETOG and ETOR
(figs 5+6+7):

Connect 1 ETOG sensor to terminals 11-16 as sensor 1.

Connect 1 ETOR sensor to terminals 17-20 as sensor 2.
Note that the pink and grey wires are not used.
Connect heating cable for zone 1 (ground) to potential-free

output relay 1 according to fig. 8.
Connect heating cable for zone 2 (roof) to potential-free
output relay 2 according to fig. 8.

• 1-zone electric heating control with output control
(Y/∆) (figs 6+9+10):

Advanced 2-stage control with ETOG. 1/3 power on heating

cables in afterrun.

Connect 1 or 2 ETOG sensors to terminals 11-20.
Connect external contactor/relays to potential-free output

relays 1, 2 and 3 according to fig. 10.

SETUP, HYDRONIC HEATING

• 1-zone hydronic heating control for controling the supply
water temp. with mixing valve (figs 6+11+13+16):

Connect 1 or 2 ETOG sensors to terminals 11-20 (fig. 6).
Connect supply voltage (24 V AC) for mixing valve to

terminals 25-26 (fig. 13).

Connect mixing valve to terminals 21-24 (fig. 13).
Connect ETF-522 supply and return sensors to terminals

27-30 (fig. 16).

Connect primary pump to potential-free output relay 1

according to fig. 14.

Connect secondary pump to potential-free output relay 2

according to fig. 14.

• 1- or 2-zone hydronic heating control, simple
(figs 3+6+12):

Connect 1 or 2 ETOG sensors to terminals 11-20 (fig. 6).

Connect circulation pump for zone 1 to potential-free output

relay 1 according to fig. 14.

If zone 2 is used, connect circulation pump for zone 2 to

potential-free output relay 2 according to fig. 14.

Same application setup as for 1- or 2-zone electric heating

control, see User Manual, Startup.

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© 2013 OJ Electronics A/S

INSTRUCTION

Type ETO2

English / Instruction

REMOTE CONTROL (fig. 15):

The forced heat and standby functions can be remotely con-

trolled by wiring ETO2 to external buttons/relays (normally open).
Connect external standby button to terminals 33-34.
Connect external forced heat button to terminals 35-36.

TESTING SNOW MELTING SYSTEM

After completing installation and application setup, it is
recommended that the snow melting system is tested.

1. Adjust SET TEMP in the setup menu to max. temperature.

2. Pour some water onto the sensor (ETOG/ETOR).

3. The output relay for the heating cable in the zone concerned

should activate and ON should be indicated on the ETO2

display. Check that the heating cable becomes warm, check

the voltage if possible.

4. After testing, adjust SET TEMP back to the desired setting

(factory setting = +3.0°C / 37.4°F).

WIRING (fig. 16):

TERMINAL COLOUR CODE WIRING

N, L Supply voltage, 115-240 V AC

1, 2 Alarm relay (potential-free), max. 5 A
3, 4 Output relay 1, 16 A (potential-free),
Heating cable 1 (zone 1) /

5, 6 Output relay 2, 16 A (potential-free),
Heating cable 2 (zone 2) /

7, 8 Output relay 3, 16 A (potential-free),

11, 12 brown/green Sensor heating 1+2, ETOG 1+2 and

13, 14 grey/pink Temperature sensor, ETOG 1
15, 16 yellow/white Moisture sensor 1, ETOG 1/ETOR 1
17, 18 grey/pink Temperature sensor, ETOG 2
19, 20 yellow/white Moisture sensor 2, ETOG 2 /ETOR 2
21, 22 3- or 4-way mixing valve, 0-10 V
23, 24 3- or 4-way mixing valve, 24 V AC
25, 26 24 V AC from external supply for 3-

27, 28 Supply water temperature sensor,

50/60Hz

Primarypump

Secondary pump

Heating cable 3

ETOR 1+2

or 4-way mixing valve

ETF-522

29, 30 Return water temperature sensor,

ETF-522
31, 32 Outdoor temperature sensor, ETF
33, 34 Standby, external input
35, 36 Forced control heat, external input

ETOR SENSOR WIRES :
Note that the pink and grey wires are not used.

Environment protection and recycling

Help protect the environment by disposing of the packaging and
redundant products in a responsible manner.

Product disposal

Products marked with this symbol must not be
disposed of along with household refuse, but must be
delivered to a waste collection centre in accordance
with current local regulations.

Figures

Fig. 1 Installation of ETOG ground sensor
1 Sensor
2 Installation plate
3 Heating element
Fig. 2 Installation of ETOR gutter sensor and ETF outdoor

sensor
1 Thermostat ETO2
2 Gutter sensor
3 Outdoor sensor
Fig. 3 1-zone electric heating with ETOG sensor
Fig. 4 1-zone electric heating with ETOR/ETF sensor
Fig. 5 2-zone electric heating (roof/ground)
Fig. 6 ETOG connection
Fig. 7 ETOR connection
Fig. 8 Heating cable connection, example
Fig. 9 2-stage electric heating control (Y/∆)
Fig. 10 Advanced 2-stage connection (Y/∆)
Fig. 11 1-zone hydronic heating control for control of supply

water temp. with mixing valve
Fig. 12 1- or 2-zone hydronic heating control, simple (same

application setup as 1- or 2-zone electric heating

control)
Fig. 13 Hydronic mixing valve connection
Fig. 14 Hydronic pump connection
Fig. 15 Connections for remote control of standby and forced

heat
Fig. 16 ETO2 controller, terminal overview

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© 2013 OJ Electronics A/S

English

User Manual

CONTENTS

Glossary .............................................................. Page 41

Introduction ............................................................. Page 41

Startup ............................................................... Page 42

Operation .............................................................. Page 43

Main menu ............................................................. Page 43

Display texts ............................................................ Page 43

Application info .......................................................... Page 44

Settings ............................................................... Page 44

Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46

Oset calibration .......................................................... Page 46

Factory settings .......................................................... Page 46

Troubleshooting .......................................................... Page 47

GLOSSARY

Zone 1, 2: Independent heating zones in which ice and snow can be melted.
Encoder button: Button which can be turned or pressed to easily configure the settings.
ETOG-55: Ground sensor for detecting moisture and temperature.
ETOR-55: Gutter sensor for detecting moisture.
ETOG-56/ETOK-1: Embedded ground sensor for detecting moister and temperature.
ETF-744/99: Outdoor sensor for detecting temperature.
Y/Δ: Advanced 2-stage control of electric heating systems.
Afterrun: The heat provided by the system, for a specified length of time, after the moisture/temperature signal has been

eliminated by a heating cycle.

INTRODUCTION

Type ETO2 is an electronic controller for fully automatic, economical ice and snow melting on outdoor surfaces and in gutters. Ice
forms due to a combination of low temperature and moisture. ETO2 detects both temperature and moisture and the heating system will
only be activated if a possibility of ice or snow is indicated by both parameters.

An easily operated encoder button and backlit graphic display ensure quick and easy configuration and simple indication of
temperature, status, etc.

ETO2 is suitable for controlling electric heating cables in 1 or 2 zones. It also features advanced two-stage output control for economic
operation.

© 2013 OJ Electronics A/S - ® The OJ trademark is a registered trademark belonging to OJ Electronics A/S

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