NELSON™ HEAT TRACING SYSTEMS
SPECIFICATION / APPLICATION
SS-1 Automatic Snow/Ice Melting Controller
DESCRIPTION
The SS-1 Automatic Snow Controller has been designed and
manufactured for the sole intended use of controlling heating
cables in residential and commercial snow melting applications
such as: sidewalks, driveways, parking garage entrances, etc. The
SS-1 uses microprocessor technology to reduce energy
consumption by energizing the heating cable only when the right
conditions of temperature and snowfall occur.
The snow and temperature sensors detect snow or ice conditions
and activate, through a pow
Another feature of SS-1 is the LED indicator light. Th
switches on and turns red if the snow sensor is dirty and needs to
be cleaned. This red LED light will switch off automatically when
the snow sensor is cleaned. The LED light turns green every time
the power relay is activated and will switch off if the power relay is
off.
Improper installation, use and/or maintenance of the SS-1 may
cause fire, electrical shock and/or result in snow
he main components of the SS-1 are shown in Fig 1.
T
er relay, the heating system.
is light
build-up.
Electrical Specifications
Functional
Operating temperature +3°C (38°F +/-1°F)
Power switch OFF temperature +45°C (112°F)
Power switch ON temperature +30°C (86°F)
Environmental
Working temperature
-40°C (-40°F
Storage temperature
-45°C (-49°F
Relative Humidity 0 to 100%
Supply Requirements
Power supply voltage 120VAC
Frequency 50/60 Hz
Maximum power consumption 60W
Output characteristics
Output type 16A Relay
)
to 65°C (150°F)
to 70°C (160°F)
)
OUTLINE
Figure 1
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
Moisture Sensor
LED Indicator
Mounting Connector
(1/2” NPT)
Temperature Sensor
SS-1 Enclosure
GA-2323 Rev. 1
Sheet 1 of 6
July 2007
NELSON™ HEAT TRACING SYSTEMS
SPECIFICATION / APPLICATION
SS-1 Automatic Snow/Ice Melting Controller INSTALLATION
OPERATING INSTRUCTIONS
The SS-1 Automatic Snow Controller is designed to energize the heating cable only
there is risk of freezing. If the temperature is below 3°C (38°F) and snow is falling, the controller will apply power to the
heating cable. The LED indicator will turn green. The cable remains energized for 2 ¾ hours after the snow stops. The delay
is necessary to ensure the heated area dries. If at any time the snow starts falling again, the controller restarts the heating
cycle.
In spring or fall when the snow conditions are not very heavy, the controller may switch on the heated area. For this situation
e recommend having a manual switch connected in series with the SS-1 to turn it off.
w
In wintertime the wind may cover the heated area with snow. The SS-1 cannot sense this situation and w
heating cable. Putting snow on the sensor surface will energize the SS-1.
The SS-1 may be tested for functionality if outside temperature is below
glass with ice water for 5 to 10 minutes, wet the surface of the moisture sensor, the SS-1 should energize the heating cable.
After this test disconnect the power for one minute and then reconnect it back. The controller should remain in stand by.
25°C (77°F). Submerge the temperature sensor into
ANNUAL MAINTENANCE
Every year, in the fall, the SS-1 must be inspected for phy
snow sensor surface:
1. Disconnect SS-1 from the power supply.
2. With a clean, soft bristle tooth brush clean up the surface of the snow
3. Reconnect SS-1 to the power supply.
Approvals:
General Locations
sical damage and to clean the snow sensor surface. To clean the
when snow or ice conditions exist and
ill not energize the
sensor.
P.O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com
GA-2323 Rev. 1
Sheet 2 of 6
July
2007
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