Application Brochure

© 2013 654_A - 06/13 14 of 16
Multi-Zone Electric A654-7 Mechanical
Description
An electric snow melting system has up to 12 zones. Zone 1 has priority over zones 2 through 12. Each Snow Melting
Control 654 is connected to a 230 V (ac) electrical contactor which in turn energizes the electric cables. Whenever the zone
1 electrical contactor is shut off, zone 2 is able to operate. Each slab is heated to maintain its slab target temperature. When
a Snow / Ice Sensor 090 or 094 is installed, the system automatically starts when snow or ice is detected and continues to run
until the slab is dry. When a Snow Sensor 095 is installed together with a Slab Sensor 072 or 073, the system automatically
starts when snow is detected and runs on a timer before shutting off. All systems can be manually started and shut off using
a timer when either a Snow / Ice Sensor 090 or 094 or a Slab Sensor 072 or 073 is installed.
Zone 1 - Application Settings
Setting Name Value
APP MODE ELEC
OUT/BRET OUT
AUX RELAY ALRT (alert)
PRIORITY COND (conditional)
Zone 2 - Application Settings
Setting Name Value
APP MODE ELEC
OUT/BRET OFF
AUX RELAY ALRT (alert)
PRIORITY COND (conditional)
Snow or Ice Detector
Option Start and Stop Sequence Sensors Required (sold separately)
1 Auto start / Auto stop Snow / Ice Sensor 090 or 094
2 Auto start / Timed stop Snow Sensor 095 & Slab Sensor 072 or 073
3 Manual start / Timed stop Slab Sensor 072 or 073
Outdoor
Sensor 070
230 V (ac)
Electrical
Contactor
230 V (ac)
Electrical
Contactor
Zone 1
Zone 2
654
654
Option 1
Snow / Ice Sensor 090 or 094
Option 2
Snow Sensor 095 and
Slab Sensor 072 or 073
Option 3
Slab Sensor 072 or 073
Alert
Equipment
Alert
Equipment
Option 1
Snow / Ice Sensor 090 or 094
Option 2
Snow Sensor 095 and
Slab Sensor 072 or 073
Option 3
Slab Sensor 072 or 073