Single-zone snow melt control installation and operation manual | 23
Manual start and timed stop
The snow melting system can be started
manually by touching the Melt key on the
control display.
Once manually started, the snow melting
system continues to operate until the time
set by the Manual Melt Run Time setting in
the Set Temp menu elapses.
If a manual start has been provided and a
sensor detects water, the control changes
from manual melt to automatic operation.
The snow melting system will continue
to operate until the sensor is dry and the
Additional Melt Time elapses.
Automatic start and stop
Automatic start and stop operation requires
the installation of a Pavement Snow and Ice
Sensor (A3040090). The control continually
monitors the sensor for the presence of
moisture and slab temperature conditions
in which snow or ice may be present. When
moisture is detected, the control will show
Sensor Water Wet in the View menu. When
the sensor is dry the control will show
Sensor Water Dry. The control includes a
Sensitivity setting in the Set Temp menu
that allows the installer to adjust the amount
of moisture required to start and stop
the melting operation. In areas with low
amounts of dust and/or air pollution, the
sensitivity may need to be increased.
The Sensitivity setting default is Auto,
and the control will automatically determine
the best suitable sensitivity setting for
the installation.
When moisture is detected and the slab
and outdoor temperatures are at or below
freezing, the control will automatically start
the snow melting system. As the snow or ice
melts and the slab dries off, the sensor also
dries off at the same time. When the sensor
is dry, the snow melt system automatically
shuts off. If there are low spots on the slab
surface that dry off slower than the sensor,
additional melting run time can be included
by adjusting the Additional Melt Time setting
in the Set Temp menu.
WWSD
Touch STOP key
Aerial Snow Sensor and slab dry
and MELT time elapses
Aerial Snow Sensor detects water
Touch MELT key
CWCO
Timed
melt
Idle
or
off
Touch
MELT
Away
Storm
Melt
Press
Melt
Melt
suspended
Enters
CWCO
Exits
CWCO
Pavement Snow
and Ice Sensor
(A3040090)
Pavement sensor and slab dry and
ADD MELT time elapses
Pavement sensor detects water
WWSD
Touch STOP key
Timed
melt
Idle
or
off
Touch MELT key
