PD Pro - Chromalox

PD Pro - Chromalox
Heating Cable
PD Pro
Snow Switch
• Automatic Snow and Ice Melting
Control Minimizes Operating
Costs
• Supply Voltage 100-277 V
• Rated for Up To 7 Amp Inductive
Loads for Pilot Duty Applications
• Loads Up To 30 Amps
• C-UL-US Listed for Temperature
Regulating Equipment
• Adjustable Hold-On Timer
Continues Heater Operation
After Snow and Ice Discontinue
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
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 manualoverride 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.
The ETI logo is a registered trademark of Environmental Technology, Inc.
SIT is a trademark of Environmental Technology, Inc.
G-61
SNOW MELTING
CONTROLS
• Weather-Resistant NEMA 4X
Enclosure
Heating Cable
PD Pro
Snow Switch (cont’d.)
Specifications
General
Area of use
Nonhazardous locations
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) for supply & load power
MaterialPolycarbonate
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
Load
Contact Type
Weight
Maximum Ratings
Heater Hold-On timer
System Test
G-62
100-277 VAC; 50/60 Hz
7 Amp maximum inductive
30 Amp resistive
2 Form A (NO)
3 Pounds (not including sensors)
Voltage: 277 VAC
Current: 30 Amps
0 to 8 hours; actuated by snow stopping or toggle switch
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
Circuit Type
Lead Length
2 ETI sensors
NEC Class 2
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
Sensor Wiring
Heater Cable
Remote Wiring
Size for heater load (30 Amps maximum)
#18 AWG jacketed, 3-conductor
Size for maximum heater load
#22 AWG jacketed, 2-conductor
Environmental
Operating temperature
Storage temperature
−31°F to 130°F (−35°C to 55°C)
−67°F to 167°F (−55°C to 75°C)
Heating Cable
PD Pro
Snow Switch (cont’d.)
Dimensions
7-7/16”
(189mm)
4"
(102mm)
Snow Switch® PD Pro™
Snow & Ice Control
SUPPLY : 120 VAC, 50/60 Hz
LOAD : 120 VAC, 7 AMP MAX. INDUCTIVE
LOAD : 120 VAC, 30 AMP MAX. RESISTIVE
4-1/4”
(108mm)
SNOW
WARNING
DANGER OF ELECTRICAL SHOCK OR
ELECTROCUTION
Lethal voltages are present beneath this cover.
Service by qualified personnel only. More than
one disconnect may be required to de-energize
this control for servicing.
HE
E
AT
R
CY
CL
SUPPLY HEAT
0
8
HOLD-ON TIME (HRS)
E
HEATER CYCLE
1-1/16”
(27mm)
Conduit Entry
Specifications and Ordering Information
PD Pro
Accessories
PCN
390010
RCU-3 Remote Control (Optional)
Snow/Ice Sensors (Not Included)
389773
CIT-1 Aerial Snow Sensor
389749
GIT-1 Gutter Ice Sensor
389757
SIT-6E Pavement Mounted Snow and Ice Sensor
389765
SNOW MELTING
CONTROLS
Model Number
To Order—Specify model, PCN and quantity.
G-63
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