DS-224 Snow/Rain Sensor Controller


• Designed for Low Voltage Systems
• Automatic Activation means Lower Deicing Costs
• Reliable Rain And Snow Detection
24 VAC/VDC Operatopm. Only 20- VA Required
• Replaceable Remote Precipitation Sensor
• Easy Installation, Full Access to Electronics
• 8 Different Functions, 1 Part Number
• Adjustable Temperature Trigger Point
• Adjustable Delay Off Cycle
• 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-224 is an advanced low voltage version of the DS-2B. It is primarily designed for pavement snow melting applications and battery/solar powered railroad deice and lubrication control. The 24VAC/VDC supply means less expensive wiring, no requirement for conduit, and lower installation costs.

The DS-224  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. The sensitivity adjustment allows setting the number of seconds the precipitation grid must see continuous rain or snow before the sensor is triggered and ranges from 3 seconds to 4 minutes. 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-224 is also compatible CDP-2 remote control/status panels.


DS-224 Datasheet

DS-224 Installation Manual