Single-zone snow melt control installation and operation manual | 5
Pull 4-conductor, 18 AWG LVT cable up to
500 feet (150m) for the Aerial Snow Sensor
(A3040095).
Pull 5-conductor, 18 AWG LVT cable up to
500 feet (150m) for the Pavement Snow
and Ice Sensor (A3040090).
Pull 2-conductor, 18 AWG LVT cable up to
500 feet (150m) for the following equipment:
• 24 VAC power from transformer
• Outdoor temperature sensor
• Supply sensor (if applicable)
• On/off boiler (if applicable)
• Modulating boiler 0-10 VDC or 4-20 mA
(if applicable)
• Alert output (if applicable)
Sizing the transformer
The control requires an external transformer.
The total power capacity of the power supply
should be larger than the total load of all the
devices connected to the control. This total
load must not exceed 100 VA.
Control wiring
Pavement Snow and
Ice Sensor (A3040090)
Aerial Snow Sensor
(A3040095)
Slab Sensor
for Aerial
Snow Sensor
(A3040073)
Snow
Sensor
095
Pavement Snow and Ice Sensor (A3040090)
Outdoor and supply sensors
Modulating boiler output
Aerial Snow Sensor (A3040095) and Slab Sensor
for Aerial Snow Sensor (A3040073)
Outdoor
sensor
Supply
sensor
– +
Modulating boiler
Brn
slab
Mod
+
Aux Ht
R
C
-
Out
Blk
com
Yel Blu Red
Sup
No power
Brn
slab
Mod
+
Aux Ht
R
C
-
Out
Blk
com
Yel Blu Red
Sup
No power
Brn
slab
Mod
+
Aux Ht
R
C
-
Out
Blk
com
Yel Blu Red
Sup
No power
Brn
slab
Mod
+
Aux Ht
R
C
-
Out
Blk
com
Yel Blu Red
Sup
No power
