DS-824 Snow/Rain Sensor Controller


• Designed for Low Voltage Hydronic and Battery Powered Systems
• Automatic Activation means Lower Deicing Costs
• Reliable Rain And Snow Detection
24 VAC/VDC Operatopm. Only 20- VA Required
• Full 30A @ 24VAC Control
• Replaceable Remote Precipitation Sensor
• Easy Installation, Full Access to Electronics
• 8 Different Functions, 1 Part Number
• Adjustable Temperature Trigger Point
• Adjustable Delay Off Cycle, Selectable 30-90 Mins or 2-6 Hrs
• Exclusive Adjustable Sensitivity Control
• Selectable Low Temperature Cutoff
• Smart "Manual On" Operates for One Delay Cycle


Dimensions 4"(120) x 7"(178) x 2"(70)
Weight 2 Lbs. (0.9 Kg)
Operating Temperature -40oF to +185oF (-40oC to +85oC)
Enclosure Rating NEMA 3R 
Supply Power 22-28VAC/VDC 15VA maximum, 5VA typical
Trigger Temperature 34oF-44oF (1.1oC-6.6oC) Field Selectable
Delay Off (Sensor) 2 Minutes
Delay Off (Controller) 30-90 Minutes/2-6 Hours Field Selectable
Load Contact Capacity 30A @ 24 VAC/100,000 operations minimum at full load
Monitor Contact Capacity 24 VDC/VAC 400mA 10W total

The DS-824 is an advanced low voltage version of the DS-8. It is primarily designed for low voltage gutter, downspout, and roof ice melting applications. It can also be used on existing buildings where retrofitting high voltage wiring would be to difficult.

The 24 VAC/VDC supply means less expensive wiring, no requirement for conduit, and lower installation costs.

The DS-824 also features a new innovation, a Trigger Sensitivity Adjustment. Previous units have always detected and triggered on the first drop of rain, the first flake of snow. While this has always provided a highly reliable detection it may create "nuisance" triggers in some installations. Snow blowing off a roof or falling from a tree could cause the system to activate for a delay cycle when its not needed, increasing operating costs.

A higher sensitivity setting assures quick detection no matter the conditions. A lower sensitivity setting will allow a few stray drips of rain or flakes of snow to be ignored but a heavier downfall will trigger the system.

The DS-824 is mounted by either attaching the mounting hub to a rigid " or " conduit or by installing screws through the four mounting tabs provided.

The remote precipitation sensor includes 10 feet (3 m) of interconnect cable. A weatherproof LED indicator on the base of the unit provides a method of checking power and trigger status when the unit is mounted in a "hard to reach" location. Steady OFF indicates no power to the unit. Steady ON indicates power is being supplied but no snow or rain trigger is active. A blinking LED indicates the DS-824 is triggered and connected equipment has been activated.


DS-824 Datasheet

DS-824 Installation Manual