Data sheet ETS
Controller For Snow Melting Systems
Application:
ETS is a 24 volt snow melting controller capable
of switching an outdoor heating system on/off
based on temperature and precipitation. Snow
melt controller applications can include snow
removal in walkways, steps, driveways, garage
entrances, gutters, loading platforms or other
locations where ice and snow accumulation is
a problem. ETS detects outdoor temperature,
ground temperature, and moisture, and
energizes electrical relays when snow or ice
occurs. The system’s heat source can be either
hydronic or electric heating cables (with the use
of an external relay).
Features:
• Electronic on/off control
• Detects moisture and temperature, or
temperature only
• Choice of ground, gutter, or outdoor sensor
• Several sensors can be connected to the
controller
• Selection of either temperature or
temperature/moisture activation of
controller
Ordering Information:
Code No. Description
ETS-3551 ETS-3551 Snow melting system controller, 24V low voltage version
ETOG-550 ETOG-550, Ground sensor for detection of slab temperature and moisture,
33ft (10m) cable
ETSR5500 ETSR5500, Gutter sensor for detection of moisture, 33ft (10m) cable
ETF-744/99 ETF-744/99, Outdoor sensor for detection of temperature
VDRKA122 © Danfoss 12/10
1
Data sheet ETS
Controller For Snow Melting Systems
Technical Data:
ETS-3551 Snow/Ice Melting Controller
Mounting Interior wall surface
Dimensions 3.4” x 2.1” x 2.3” (L x W x D)
Supply voltage
Output relays 1 relay: 10-A, (potential free contacts)
On/Off diff erential 0.6°F (0.3°C)
Ambient temperature +32° to 122°F (0° to +50°C)
Temperature range +32°F to 41°F (0° to +5°C)
Detection mode
Scale Adjustment
24 Vac ±10%
1) Moisture & temperature sensing
2) Temperature only
Fine tuning of temperature setup ± 9°F (± 5°C)
ETOG-550, Ground Sensor
Detection Moisture
Mounting Flush to surface
Cable length 33ft (10m)
Ambient temperature -4 to 158°F (-20 to 70°C)
Dimensions
ETSR5500, Gutter Sensor
Detection Moisture
Mounting
Cable length 33ft (10m)
Ambient temperature -4° to 158°F (-20° to 70°C)
Dimensions 4.15” x 1.2” x 0.5” (105 x 30 x 13mm)
H: 1.25”, ± 2.4” (H: 32mm, ± 60mm)
Gutter or downspout, used in
combination with ETF-744/99
L x W x H
ETF-744/99, Outdoor Sensor
Detection Air temperature
Mounting Exterior wall
Ambient temperature -4° to 158°F (-20° to 70°C)
Dimensions
2
VDRKA122 © Danfoss 12/10
4.15” x 1.2” x 0.5” (105 x 30 x 13mm)
L x W x H
Data sheet ETS
Controller For Snow Melting Systems
Function:
The ETS is a stand alone snow melt controller
that provides an economical method for
removing the accumulation of snow or ice in
unwanted areas.
Mode Selection:
The controller can be selected to activate based
upon either both temperature and precipitation
or through temperature only, via toggle switch.
The diff erent sensors ETOG, ETSR and ETF
sensors are wired to the controller to provide
the feedback for the controller
Settable Temperature for Activation of
Controller:
The large adjustable knob sets the temperature
at which the controller would start the system.
This scale adjustment is adjustable from
32° to 41°F (0° to 5°C). Depending on the
mode selection, once the controller senses
the temperature through either the ETOG
pavement sensor or ETF outdoor sensor the
controller would activate.
Scale Adjustment:
Between the mode and settable temperature,
there is an adjustment knob to fi ne tune the
settable temperature. The adjustment of the
temperature is ± 9°F (± 5°C).
Wiring Diagrams:
Outdoor Sensor,
ETF
Gutter Sensor,
ETSR
N
L
VDRKA122 © Danfoss 12/10
(External relay necessary
with electric heating cable
application)
3
Data sheet ETS
Controller For Snow Melting Systems
Dimensions:
ETOG Sensor
ETSR Sensor
Green
Green
Yellow
Brown
Yellow
Brown
Grey
White
Screen
White
Screen
4.15”
1.2”
”
.4
2
1.25”
1.2”
ETS Controller
2.3” (58mm)
1.8” (45mm)
2.4” (62mm)
3.4” (86mm)
1.1”
(29mm)
Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice.
All trademarks in this material are property of the respective companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
Danfoss Inc.
Toronto, ON
Tel.: 905-285-2050, Fax: 905-285-2055
www.na.heating.danfoss.com
Danfoss Inc.
Baltimore, MD
Tel.: 443-512-0266, Fax: 443-512-0270
www.na.heating.danfoss.com
0.7”
(19mm)
2.3” (58mm)
0.4”
(10mm)
4
VDRKA122 © Danfoss 12/10
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