tekmar 654 Snow Melting Control Installation - Manual (Page 27)

27 of 44 © 2013 654_D - 06/13
Melt - Automatic Start and Timed Stop
Automatic start with a timed stop operation requires the instal-
lation of a Snow Sensor 095. It is also highly recommended to
install a Slab Sensor 072 (20’ or 6 m cable) or 073 (40’ or 12 m
cable) in order to regulate the slab temperature and operate
the snow melting system at the highest possible efficiency.
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 factory default is for the Sensitivity setting is
Auto. The control automatically determines the best suitable
sensitivity setting for the installation.
When moisture is detected and both the slab and outdoor
temperatures are below the Melting setting, the control auto-
matically starts the snow melting system. The snow melting
system operates to heat the slab to the slab target temperature
and continues to operate until the time set by the Manual Melt
Run Time in the Set Temp menu elapses.
Melt - EconoMelt
When a Snow / Ice Sensor 090 or 094 is installed, the installer
can choose to select to either automatically or manually
start the snow melting system. Selecting EconoMelt to On
provides the option to remove the snow using a snow plow
or shovel and then use the snow melting system to melt the
remaining thin layer of snow or ice that mechanical snow
removal methods are unable to remove. The snow melting
system stops when the sensor is dry. The factory default for
EconoMelt is Off.
Touch MELT key
095 detects water
Tracked zone melt
User Switch / Gateway Enable
MANUAL MELT RUN TIME elapses
AWAY scene
Tracked zone time elapses
Touch STOP key
WWSD
User Switch / Gateway Disable
CWCO
Timed
Melt
or
Idle
Off
095 detects water
Touch START key
090 and slab dry and
ADD MELT time elapses
AWAY scene
Touch STOP key
WWSD
User Switch / Gateway Disable
Melt Off
Exits
CWCO Melt
Suspended
Enters
CWCO
Snow
Sensor 095