Automatic Snow and Ice Melting System Control for Pilot Duty Applications
Snow Switch Model PD Pro
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
PD Pro Snow & Ice Control for Pilot Duty Applications
PD Pro Mounting Dimensions
Description
The Snow Switch Model PD Pro is an automatic snow and ice melting control system. Utilizing standard Environmental Technology snow and ice sensors (sold separately), applications include snow and ice detection and melting for pavement, sidewalks, loading docks, roofs, gutters and downspouts in commercial and residential environments.
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.
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 cancelation 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.
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.
Specifications
General
Area of use Nonhazardous locations
Approvals C-UL-US Listed, Type 873 Temperature Regulating Equipment
Enclosure
Protection NEMA 4X
Cover attachment Polycarbonate with machine screws
Entries 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
Material Polycarbonate
Mounting Wall mount
Dimensions 5 1/2" (L) x 8 1/8" (W) x 4 3/8" (H) / 140mm (L) x 207mm (W) x 112mm (H)
Control
Supply voltage 120 VAC; 50/60 Hz
Load 7 amp maximum inductive
30 amp maximum resistive
Contact type 2 Form A
Weight 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
Environmental
Operating temperature -31°F to 130°F (-35°C to 55°C)
Storage temperature -67°F to 167°F (-55°C to 75°C)