Application Brochure

© 2013 654_A - 06/13 10 of 16
Multi-Zone with Boiler and Mixing A654-5 Mechanical
Description
Up to 12 zones of snow melting are heated by a common three-way mixing valve and boiler. Each zone is operated by a Snow
Melting Control 654. The mixing valve and boiler are operated by a Universal Reset Module 422 and Zone Manager 336.
Snow melt zone priority is available if the boiler is not sized for the combined heating load. 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.
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
Zone 1 and 2 - Application Settings
Setting Name Value
APP MODE PWM
BOIL TYPE CTRL (tN4 control)
tN4 SYS PUMP ON
Outdoor
Sensor 070
On/Off
Boiler
Zone 1
Freeze Protection
Aquastat N.C. Contact
Boiler
Pump
Mix
Supply
Sensor
082
Boiler
Supply
Sensor
082
Zone 2
Zone 1
Pump
Zone 2
Pump
Supply
Sensor
082
Supply
Sensor
082
422 336
654
654
Option 2
Snow Sensor 095 and
Slab Sensor 072 or 073
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
Recommended Accessories
Qty Part Name Part Number
1 Universal Reset Module 422
1 Zone Manager 336
Option 1
Snow / Ice Sensor 090 or 094
Option 3
Slab Sensor 072 or 073