Danfoss ETS, ETS-3551, ETOG-550, ETSR5500, ETF-744/99 Data sheet
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
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