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You searched for: ETI Snow Switch Model PD Pro Automatic Snow & Ice Melting System Control for Pilot Duty Applications, 120V
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ETI Snow Switch Model PD Pro Automatic Snow & Ice Melting System Control for Pilot Duty Applications, 120V

Features & Benefits

  • Automatic snow and ice melting control minimizes operating costs

  • Rated for up to 7 amp inductive loads for pilot duty applications and resistive loads up to 30 amps

  • Weather-resistant NEMA 4X enclosure

  • C-UL-US Listed for Temperature Regulating Equipment

  • Adjustable Hold-On timer continues heater operation after snow and ice stop to ensure complete melting

  • Dual sensor capability to meet site performance requirements

  • Automatic and manual-override operator controls for changing environmental conditions

  • Optional remote control operation for added convenience


Snow and ice melting systems control with pilot duty

Utilizing standard Environmental Technology snow and ice sensors (sold separately), the automatic Snow Switch® Model PD Pro control is used in snow and ice detection and melting for pavement, sidewalks, loading docks, roofs, gutters and downspouts in commercial and residential environments.

ETI Proprietary Moisture, Temperature Sensors

The PD Pro interfaces with up to two standard Environmental Technology sensors to meet site requirements. The CIT–1, GIT–1, and SIT–6E sensors reliably detect snow and ice melting in gutter and pavement applications.

The CIT–1 aerial snow sensor detects falling or blowing precipitation before snow or ice begin to form, allowing the control to begin managing the system. The CIT–1 sensor may be roof or mast mounted and can be paired with the GIT–1 sensor for gutter applications or the SIT–6E sensor for pavement applications.

All three sensors detect precipitation as snow at temperatures below 38°F (3.3°C). The PD Pro is signaled only if moisture occurs below this temperature, saving energy and ensuring thorough snow and ice melting. Since 1968, these sensors have been the industry’s most versatile and cost-effective automatic snow melting control sensors.

Automatic and Manual-Override

The PD Pro features automatic and manual-override operator controls. The adjustable Hold-On timer continues heater operations up to 8 hours after snow or ice conditions end to ensure complete melting. The Heater Cycle control button allows manual initiation or cancellation of a heating cycle. The optional RCU–3 remote control unit can be located for convenient monitoring and control. These flexible control options provide complete snow melting and water evaporation at a low operating cost.

When Pilot Duty is a Better Choice

The PD Pro weighs only 3 pounds and measures 5 1/2” (L) x 8 1/8” (W) x 4 3/8” (H). Comprehensive instruction manuals simplify installation and operation. These products are also supported by Environmental Technology Technical Support.

The PD Pro is a capable snow and ice control for medium-sized applications whose features and power requirements do not require an APS or EUR Series control panel.



Area of use
Nonhazardous locations

C-UL-US Listed, Type 873 Temperature Regulating Equipment



Cover attachment
Polycarbonate with machine screws

2 x 3/4" entry (bottom right) for NEC Class 2 connections
3 x 1-1/16" entries (bottom left and left) for supply and load power


Wall mount

5 1/2" (L) x 8 1/8" (W) x 4 3/8" (H) / 140mm (L) x 207mm (W) x 112mm (H)


Supply voltage
120 VAC; 50/60 Hz

7 amp maximum inductive
30 amp maximum resistive

Contact type
2 Form A

3 Pounds (not including sensors)

Maximum ratings
Voltage: 120 VAC
Current: 30 amps

Heater Hold-On timer
0 to 8 hours; actuated by snow stopping or toggle switch

System test
Switch toggles heater contact on and off. If temperature exceeds optional high limit thermistor (45°F), heater shuts off to reduce costs and prevent damage.

Front Panel Interface

Status indicator
SUPPLY (green): Power on
HEAT (yellow): Heating cycle in progress
SNOW (yellow): Sensor(s) detect snow

Snow/Ice Sensors

Maximum quantity
2 ETI sensors

Circuit type
NEC Class 2

Lead length
Up to 500' (152m) using 18 AWG 3-wire jacketed cable
Up to 2,000' (609m) using 12 AWG 3-wire jacketed cable

Wire and Cable Ratings

Power cable
Size for heater load (30 amps maximum)

Sensor wiring
#18 AWG jacketed, 3-conductor

Heater cable
Size for maximum heater load

Remote wiring
#22 AWG jacketed, 2-conductor


Operating temperature
-31°F to 130°F (-35°C to 55°C)

Storage temperature
-67°F to 167°F (-55°C to 75°C)

Installation and Operation Instructions
Installation Instructions
Data Sheet
Item CodeDescriptionVendorQuantity
PD Pro Snow & Ice Control, 120 VAC
ETI (Environmental Technology Inc.) Snow Switch Automatic Snow & Ice Melting System Control for Pilot Duty Applications, 120V - UL / CSA