Application Brochure

© 2013 654_A - 06/13 2 of 16
Single Zone with Boiler A654-1 Mechanical
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
Outdoor
Sensor 070
Relay 003 Relay 003
Boiler
Supply
Sensor
082
System
Pump
Modulating Boiler
654
Description
A Snow Melting Control 654 operates a hydronic snow melting system using a modulating boiler and a system pump. The
boiler is piped in primary-secondary to the snow melt system to allow the system pump to operate continuously during
melting or idling while allowing the boiler and boiler pump to turn on and off as required. The boiler firing rate is modulated
using a 0-10 V (dc) or 4-20 mA signal. The slab is heated to maintain the 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.
Application Settings
Setting Name Value
APP MODE BOIL
BOIL TYPE MOD (modulating boiler)
AUX RELAY SYS (system pump)
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
Recommended Accessories
Qty Part Name Part Number
2 Relay 003
1 Transformer 009