tekmar 654 Snow Melting Control Installation - Manual (Page 26)

© 2013 654_D - 06/13 26 of 44
Melt - Manual Start and Timed Stop
The snow melting system can be started manually in one of
three different methods:
Touch the Melt key on the control display.
Press the Setpoint Enable button on a User Switch.
Activate through a Gateway webpage or home automation
system. •
•
•
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
Press
Melt
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 Snow / Ice 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.
Away
Storm
Melt
Press
Melt
tN4 User Switch
480 or 481
Melt - Automatic Start and Stop
Automatic start and stop operation requires the installation
of a Snow / Ice Sensor 090 (65' or 20 m cable) or 094 (210'
or 64 m cable). The control continually monitors the sensor
for the presence of moisture and slab temperature condi-
tions 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.
Touch STOP key
090 or 094 and slab dry and
ADD MELT time elapses
or
Idle
Off
AWAY scene
WWSD
090 or 094 detects water
Exits
CWCO Melt
Suspended
Enters
CWCO
Auto
Melt
User Switch / Gateway Disable
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.
If the snow melting system is manually stopped, the Snow / Ice
Sensor must fully dry before it is able to detect a new snow fall
and automatically start the snow melting system.
Snow / Ice Sensor
090 or 094