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Melt
–
Manual Start and Timed Stop
The snow melting system can be started manually in one of
four different methods:
• Touch the Melt button on the control display
• Through the mobile app
• Through a Gateway 482 or 485 melt request message
• By manually connecting the Manual Melt and Com wiring
terminals 13 and 14 together.
Push Melt Button
Mobile App Melt Button
Gateway 482 or 485 Melt Message
Manual Melt Switch
Manual Melt Run Time Elapses
WWSD
Push Stop Button
Mobile App Melt Button
Gateway 482 or 485 Stop Message
CWCO
Melting
Manual
Start/
Timed
Stop
or
Idle
Off
Once manually started and the slab warms up to the slab target,
the snow melting system runs until the time set by the Manual
Melt Run Time setting in the Temperatures 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 runs until the
sensor is dry and the Additional Melt Time elapses.
Tandem Snow/Ice Detection
The 670 can be paired together with a 654 to allow two Snow/
Ice sensors 090 or 094 or Snow Sensors 095 to be installed
for a single zone. This provides full redundancy and increases
the snow detection area.
Both sensors are used to detect snow or ice and if either
sensor is wet the snow melting zone starts melting. The
control continues to operate until both sensors are dry. This
allows snow or ice detection over a wider area. In the event
of a sensor failure, the control continues to operate normally,
giving building maintenance staff time to troubleshoot and
replace the faulty sensor if necessary.
Press Melt button to start melting operation
Melt - Tracked Start and Stop
The snow melting system can have multiple zones. Zones
have the option to track the melting run time of zone 1. This
is useful in cases where zone 1 has an automatic Snow / Ice
Sensor installed and the remaining zones do not. This allows
zones 2 to 12 to gain the functionality of automatic starting and
stopping with only one Snow / Ice sensor installed in the system.
When zone 1 detects snow or ice, it starts melting. Zones
with tracking enabled can also start melting unless priority is
selected. When the sensor in zone 1 is dry or the Manual Melt
Run Time has fully elapsed, it sends a signal to the tracked
zones that zone 1 has stopped. Each zone can continue to
operate to complete their own Additional Melt Time after which
the zone stops heating and returns to the Off or Idle operation.
Zones with priority selected start after zone 1 has finished
melting and repeat the same run time as zone 1.
Zone 1
Track Melt Start and Stop
Records
Run Time
Snow / Ice
Sensor
Slab
Sensor
Slab
Sensor
Zone 2
Zone 3
Repeats
Zone 1 Run
Time + Add
Melt Time
Repeats
Zone 1 Run
Time + Add
Melt Time