roof and gutter de-icing — icestop system

roof and gutter de-icing — icestop system
ROOF AND GUTTER DE-ICING ­—
ICESTOP SYSTEM
This step-by-step design guide provides the tools necessary to design a Raychem
IceStop roof and gutter de-icing system. For other applications or for design
assistance, contact your Thermal Management representative or call (800) 545‑6258.
Also, visit our web site at www.pentairthermal.com.
Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
How to Use this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Self-Regulating Heating Cable Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Roof and Gutter De-Icing Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Design Step by Step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Step 1 Determine design conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 2 Select the heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 3 Determine the heating cable length. . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 Determine the electrical parameters. . . . . . . . . . . . . . . . . . . . . 16
Step 5 Select the connection kits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Step 6 Select attachment accessories and method . . . . . . . . . . . . . . . 21
Step 7 Select the control system and power distribution. . . . . . . . . . . 27
Step 8 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . 33
IceStop System Roof and Gutter De-Icing Design Worksheet. . . . . . . . . . . . . . . . . . 34
INTRODUCTION
Raychem IceStop is a roof and gutter de-icing system that provides drain paths for
the following applications:
• Roofs made from standard roofing materials, including shake, shingle, rubber,
tar, wood, metal, and plastic.
• Gutters made from standard materials, including metal, plastic, and wood.
• Downspouts made from standard materials, including metal and plastic.
The guide does not cover applications in which any of the following conditions exist:
• Preventing snow movement on roofs — IceStop will not keep snow or ice from
falling off the roof. IceStop is designed to remove melt water, not accumulated
snow. Snow fences or snow guards should be used to eliminate snow movement.
• Melting snow on a roof and/or reduction of snow load — IceStop is designed to
remove melt water, not accumulated snow.
If your application conditions are different, or if you have any questions, contact your
Thermal Management representative, or call (800) 545-6258.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
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Roof and Gutter De-icing ­— IceStop System
How to Use this Guide
This design guide presents Thermal Management’s recommendations for
designing an IceStop roof and gutter de-icing system. It provides design and
performance data, electrical sizing information, and heating-cable layout
suggestions. Following these recommendations will result in a reliable, energyefficient system.
OTHER REQUIRED DOCUMENTS
This guide is not intended to provide comprehensive installation instructions. For
complete IceStop roof and gutter de-icing system installation instructions, please
refer to the following additional required documents:
• IceStop System Installation and Operation Manual (H58067)
• Additional installation instructions that are included with the connection kits,
thermostats, controllers, and accessories
If you do not have these documents, you can obtain them from the Thermal
Management web site at www.pentairthermal.com.
For products and applications not covered by this design guide, please contact your
Thermal Management representative or call (800) 545-6258.
Safety Guidelines
As with any electrical equipment, the safety and reliability of any system depends
on the quality of the products selected and the manner in which they are installed
and maintained. Incorrect design, handling, installation, or maintenance of any of
the system components could damage the system and may result in inadequate
performance, overheating, electric shock, or fire. To minimize these risks and to
ensure that the system performs reliably, read and carefully follow the information,
warnings, and instructions in this guide.
This symbol identifies important instructions or information.
This symbol identifies particularly important safety warnings that must be
followed.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.
Warranty
Thermal Management’ standard limited warranty applies to Raychem Roof and
Gutter De-icing Systems.
An extension of the limited warranty period to ten (10) years from the date of
installation is available, except for the control and distribution systems, if a properly
completed online warranty form is submitted within thirty (30) days from the date of
installation. You can access the complete warranty on our web site at
www.pentairthermal.com.
2 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
SYSTEM OVERVIEW
The Raychem IceStop system can prevent ice dams and icicles by maintaining a
continuous path for melt water to drain from the roof. The IceStop system uses
a self-regulating heating cable which reduces heat output automatically as the
cable warms to above freezing, resulting in lower energy use, and eliminating the
possibility of overheating. A typical roof and gutter de-icing system includes the
IceStop self-regulating heating cables, connection kits, control system and power
distribution.
Typical System
A typical system includes the following:
• IceStop self-regulating heating cable
• Connection kits and accessories
• Control system
• Power distribution
Power Connection Kits
Splice Kits
Attachment Kits
Tee Kits
Gutter Sensor
Downspout Hanger Kit
End Seal Kit
Lighted End Seal
Heating Cable
Power Distribution Panel
Snow Controller
APS
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Fig. 1 Typical IceStop roof and gutter de-icing system
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
3 / 40
Roof and Gutter De-icing ­— IceStop System
Self-Regulating Heating Cable Construction
Raychem IceStop self-regulating heating cables are comprised of two parallel
nickel-coated bus wires in a cross-linked polymer core, a tinned copper braid and a
fluoropolymer or polyolefin outer jacket. These cables are cut to length simplifying
the application design and installation.
Fluoropolymer (-XT) or
modified polyolefin (-X) outer jacket
Tinned-copper braid
Modified polyolefin inner jacket
Self-regulating conductive core
Nickel-plated copper bus wire
Fig. 2 IceStop heating cable construction
With self-regulating technology, the number of electrical paths between bus wires
changes in response to temperature fluctuations. As the temperature surrounding
the heater decreases, the conductive core contracts microscopically. This contraction
decreases electrical resistance and creates numerous electrical paths between the
bus wires. Current flows across these paths to warm the core.
As the temperature rises, the core expands microscopically. This expansion
increases electrical resistance and the number of electrical paths decreases. The
heating cable automatically begins to reduce its output.
At high temperature,
there are few conducting
paths and output is
correspondingly lower,
conserving energy
during operation.
The following graphs illustrate the response of self-regulating heating
cables to changes in temperature. As the temperature rises, electrical
resistance increases, and our heaters reduce their power output.
Power
re
g
ul
at
in
g
Constant wattage
Se
lf-
At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.
Resistance
At low temperature,
there are many conducting paths, resulting in
high output and rapid
heat-up. Heat is
generated only when it is
needed and precisely
where it is needed.
Temperature
Constant wattage
Se
lf-
re
g
ul
at
ing
Temperature
Fig. 3 Self-regulating heating cable technology
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Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Approvals
The IceStop roof and gutter de-icing system is UL Listed, CSA Certified, and FM
Approved for use in nonhazardous locations. GM-1XT and GM-2XT are FM Approved
for use in Class I, Division 2 hazardous locations.
-ws
ROOF AND GUTTER DE-ICING DESIGN
This section details the design steps necessary to design your application. The
example provided in each step is intended to incrementally illustrate the project
parameter output for a sample design from start to finish. As you go through each
step, use the “IceStop System Roof and Gutter De-Icing Design Worksheet” on
page 34, to document your project parameters, so that by the end of this section,
you will have the information you need for your Bill of Materials.
Roof & Gutter De-Icing Calculator is an online design tool available to help you
create roof & gutter designs and layouts. It is available at http://www.pentairthermal.
com.
Design Step by Step
 Determine design conditions
 Select the heating cable
 Determine the heating cable length
 Determine the electrical parameters
 Select the connection kits
 Select attachment accessories and method
 Select the control system and power distribution
 Complete the Bill of Materials
THERMAL MANAGEMENT
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Roof and Gutter De-icing ­— IceStop System
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials
Step 1 Determine design conditions
Collect the following information to determine your design conditions:
• Type of roof
• Layout
–– Roof edge
–– Eave overhang
–– Gutters
-Length
-Depth
-Width
–– Roof valley
–– Roof/wall intersections
–– Downspouts
• Supply voltage
• Minimum start-up temperature
• Control method
PREPARE SCALE DRAWING
Draw to scale the roof of the building noting roof valleys, different roof levels
and gutter and downspout locations. Note rating and location of voltage supply.
Measurements for each distinct section of the roof system, the gutters and
the downspouts, will allow for an accurate systems design, including control
configuration.
Example: Roof and Gutter De-Icing System
Type of roof
Sloped roof – standard with wood shingles and
gutters
Layout
6 / 40
Roof edge
50 ft (15.2 m) x 2 roof edges = 100 ft (30.5 m)
Eave overhang
24 inch (60 cm)
Gutters
2 gutters
Length
50 ft (15.2 m) x 2 roof edges = 100 ft (30.5 m)
Depth
6 in (15 cm)
Width
4 in (11 cm)
Roof valley
20 ft (6.1 m)
Downspouts
12 ft (3.7 m) x 2 downspouts = 24 ft (7.4 m)
Supply voltage
208 V
Minimum start-up temperature
20°F (–7°C)
Control method
Automatic controller
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Roof and Gutter
De-Icing
Step 2 Select the heating cable
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
To select the appropriate IceStop heating cable for your application, use the supply
voltage from Step 1, and select the appropriate outer jacket material. Once you
select these, you will be able to determine the catalog number for your cable.
HEATING CABLE CATALOG NUMBER
Before beginning, take a moment to understand the structure underlying the
heating cable catalog numbers. You will refer to this numbering convention
throughout the product selection process. Select the appropriate heating cable
catalog number based on the voltage and outer jacket, as indicated below.
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials
Catalog number:
GM — 1 or 2
-X or -XT
Product family
Voltage
1 = 120 V
2 = 208–277 V
Jacket type: Polyolefin
or
Fluoropolymer
Fig. 4 Heating cable catalog number
SELECT HEATING CABLE SUPPLY VOLTAGE
Select the heating cable supply voltage. Note that a higher supply voltage will allow
for longer circuit lengths. Supply voltage options include:
1 = 120 V
2 = 208–277 V
EVALUATE HEATING CABLE SPECIFICATIONS
Use the following table to evaluate heating cable specifications that describe some
important aspects of the heating cable.
Table 1 ICESTOP SELF-REGULATING HEATING CABLE SPECIFICATIONS
Power output (nominal)
12 W/ft (39 W/m) in ice or snow
Minimum installation temperature
0°F (–18°C)
Minimum bend radius
5/8 in (16 mm)
SELECT OUTER JACKET
Select the appropriate heating cable outer jacket for the application. Jacket options
include:
-X A polyolefin outer jacket (-X) is more economical for less demanding
applications.
-XT A fluoropolymer outer jacket (-XT) provides maximum abrasion, chemical,
and mechanical resistance.
Example: Roof and Gutter De-Icing System
THERMAL MANAGEMENT
Supply voltage
208 V (from Step 1)
Catalog number
GM-2XT
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Roof and Gutter De-icing ­— IceStop System
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
Step 3 Determine the heating cable length
To determine the required heating cable length for your application, you will need to
determine the heating cable layout for each roof and gutter section that requires ice
protection. Detailed sketches of the building from Step 1 can ensure each area
and level is accounted for. The following guide will help determine length of cable
required for a variety of roof types and sections. For applications not covered in this
section, please contact Thermal Management for assistance.
Heating cable layout depends primarily on the roof type and its related roof features.
The following sections show typical layouts on standard roof types
Table 2 ROOF TYPES AND AREAS
7. Select the control
system and power
distribution
Roof type
Page
Sloped roof – standard
page 9
8. Complete the Bill
of Materials
Sloped roof – standing seam
page 10
Flat roof
page 11
Sloped roof without gutters
page 12
Roof features
Roof valley
page 13
Roof/wall intersections
page 13
Gutters
page 14
Downspouts
page 15
Important: For optimum performance, the heating cable should be in contact
with snow or ice. Installing the heating cable under the roofing or the roofing
materials will reduce the efficiency of the heating system. Please contact Thermal
Management for assistance.
Fig. 5 and Fig. 6 below illustrate several important terms:
Tracing
height
Downspout
hanger
Clips
Tracing
width
Fig. 5 Front view of roof with IceStop system
Roof
12" (30 cm)
Area where ice dams are
most likely to form
Heating cable
Heated
area
Gutter
Eave overhang
Exterior wall
Fig. 6 Side view of roof with IceStop system
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Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
SLOPED ROOF — STANDARD
For sloped roofs, ice dams may form at the roof edge. To maintain a continuous
path for melt water runoff, route the heating cable in a zig-zag pattern as shown in
Fig. 7 and follow the appropriate attachment recommendations in “Step 6 Select
attachment accessories and method”. Additional heating cable may be needed for
other gutters, downspouts, and valleys.
m)
0c
(6
2'
Fig. 7 Layout in a zig-zag pattern
• Install the heating cable on the roof in a zig-zag pattern as shown in Fig. 7.
• Run heating cable up the roof until it is 12 inches (30 cm) past the exterior wall
into the heated area (see Fig. 6 on page 8).
• Use Table 3 to determine how much heating cable to use per foot of roof edge.
This will determine how much heating cable you need to trace on the roof. Additional heating cable will be needed for gutters, downspouts, and component
connections.
Table 3 ICESTOP HEATING CABLE LENGTH FOR SLOPED ROOF – STANDARD
Eave
overhang
distance
Tracing width
Feet of heating Meters of heating
cable per foot cable per meter
Tracing height of roof edge
of roof edge
0
2 ft
(60 cm)
12 in (30 cm)
2.5 ft
2.5 m
12 in (30 cm)
2 ft
(60 cm)
24 in (60 cm)
3.1 ft
3.1 m
24 in (60 cm)
2 ft
(60 cm)
36 in (90 cm)
4.2 ft
4.2 m
36 in (90 cm)
2 ft
(60 cm)
48 in (120 cm)
5.2 ft
5.2 m
For roofs without gutters, add 6 inches of heating cable per foot of roof edge (0.5
meters of heating cable per meter of roof edge) to allow for a 2–3 inch (5–8 cm) drip
loop to hang off the roof edge as shown in Fig. 10 on page 12.
For roofs with gutters, heating cable must be run to the bottom of the gutter. You
can determine the amount of extra heating cable required by adding twice the gutter
depth per foot of roof edge to the amount determined in Table 3.
For example, for a 6 inch deep gutter, add 1 foot of heating cable per foot of roof edge
to the amount determined using Table 3.
Additional heating cable must be run along the bottom of the gutter. See “Gutters”
on page 14.
Note: Attachment methods are not shown in Fig. 7. For attachment methods,
proceed to “Step 6 Select attachment accessories and method”.
THERMAL MANAGEMENT
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Roof and Gutter De-icing ­— IceStop System
SLOPED ROOF — STANDING SEAM
For sloped standing-seam metal roofs, ice dams may form at the roof edge. To
maintain a continuous path for melt water to run off, route the heating cable along
the seams as shown in Fig. 8 and follow the attachment recommendations in “Step
6 Select attachment accessories and method” on page 21. Additional heating
cable may be needed for gutters, downspouts, and valleys.
Fig. 8 Layout on a standing seam roof
• Run the heating cable up one side of the seam, loop it over to the other side, and
return it to the bottom of the gutter. Continue along the bottom of the gutter to
the third seam and repeat the process (Fig. 8 on page 10). If the seams are
more than 24 inches (60 cm) apart, trace every seam.
• Run the heating cable up the seam until it is 12 inches (30 cm) past the exterior
wall and into a heated area, Fig. 6 on page 8.
• If the roofing materials continue down the fascia, contact your local Thermal Management representative or Thermal Management directly for design assistance.
• If there are no gutters, refer to “Heated Drip Edges” on page 26, for information
on how to install heating cable for this application.
Table 4 ICESTOP HEATING CABLE LENGTH FOR SLOPED ROOF –
STANDING SEAM
Meters of
Feet of heating heating cable
Eave overhang Standing seam
cable per foot per meter of
distance
spacing
Tracing height of roof edge
roof edge
12 in (30 cm)
18 in (45 cm)
24 in (60 cm)
2.8 ft
2.8 m
24 in (60 cm)
18 in (45 cm)
36 in (90 cm)
3.6 ft
3.6 m
36 in (90 cm)
18 in (45 cm)
48 in (120 cm)
4.3 ft
4.3 m
12 in (30 cm)
24 in (60 cm)
24 in (60 cm)
2.4 ft
2.4 m
24 in (60 cm)
24 in (60 cm)
36 in (90 cm)
2.9 ft
2.9 m
36 in (90 cm)
24 in (60 cm)
48 in (120 cm)
3.6 ft
3.6 m
For standing seam roofs without gutters, add 6 inches (0.1 meter) of heating cable
for each seam traced to allow for a 2–3 inch (5–8 cm) drip loop to hang off the roof
edge as shown in Fig. 10.
For standing seam roofs with gutters, heating cable must be run to the bottom of the
gutter. You can determine the amount of extra heating cable required by adding twice
the gutter depth per seam traced to the amount determined in Table 4.
Additional heating cable will be needed for component connections and downspouts.
Note: Attachment methods are not shown in Fig. 8. For attachment methods,
proceed to “Step 6 Select attachment accessories and method” on page 21.
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Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
FLAT ROOF
Ice dams may occur on flat roofs at the edge flashing and at drains. Flat roofs are
typically pitched toward drains and these paths often become obstructed by snow
and ice. To maintain a continuous path for melt water to run off, route the heating
cable as shown in Fig. 9 and follow the appropriate attachment recommendations
in “Step 6 Select attachment accessories and method” on page 21. Additional
heating cable may be needed for downspouts.
Slope
Drain
Heating cable should be positioned around
the perimeter and in the valleys of a flat roof.
The heating cable must extend into the drain or
scupper to allow the melt water to exit the roof.
Cable
Junction
end seal box
Drip loop
Scupper
Ice can form around
drain and at roof edges
where adjacent snow
thaws during the day
and refreezes at night.
Heating cable provides a
continuous heated path to
allow melt water to run off
the roof before it refreezes.
Fig. 9 Layout on a flat roof
• Place heating cable around perimeter.
• Trace valleys from perimeter to drain.
• Extend heating cable into internal downspouts at least 12 inches (30 cm) into
heated space.
• External downspouts and scuppers must be treated carefully. A path must be provided for the valley/perimeter heating cable to the point of discharge (see Fig. 17
on page 15).
• To avoid damage, do not walk on the heating cable.
THERMAL MANAGEMENT
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Roof and Gutter De-icing ­— IceStop System
SLOPED ROOF WITHOUT GUTTERS
When gutters are not used on a building, ice dams may form at the roof edge. To
maintain a continuous path for melt water to run off, a drip loop or heated drip edge
may be used. Drip loops and drip edges allow water to drip free of the roof edge.
Route the heating cable as shown in Fig. 10 or Fig. 11 below and follow the
appropriate attachment recommendations in “Step 4 Determine the electrical
parameters” on page 16. Additional heating cable may be needed for valleys.
2"–3"
(5–8 cm)
Fig. 10 Layout for heated drip loops
IceStop
heating
cable
Fig. 11 Layout for heated drip edge
Note: Attachment methods are not shown in the above illustrations. For
attachment methods, proceed to “Step 6 Select attachment accessories and
method” on page 21.
OTHER CONSIDERATIONS
• Ice will build up on the surfaces below the drip loop or drip edge if gutters are not
used.
• Ice may also build up on the vertical surfaces if there isn’t a sufficient overhang or
if there is a strong wind. Using a gutter system will prevent this ice buildup.
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Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
ROOF VALLEYS
Ice dams may form at the valley on a roof where two different slopes meet. To
maintain a continuous path for melt water, run the heating cable up and down the
valley as shown in Fig. 12 and follow the appropriate attachment recommendations
in “Step 6 Select attachment accessories and method” on page 21. Additional
heating cable may be needed for the roof surface, gutters, and downspouts.
1/3
2/3
Fig. 12 Layout for a roof valley
• Trace two-thirds of the way up each valley with a double run of heating cable (loop
up and back once).
• The heating cable must extend into the gutter. If you don’t have gutters, the heating cable should extend over the edge 2 to 3 inches (5 to 8 cm) to form a drip loop.
• For attachment methods, proceed to “Step 6 Select attachment accessories and
method” on page 21.
ROOF/WALL INTERSECTIONS
Roof/wall intersections can be treated in the same manner as valleys. Snow has
a tendency to collect at this interface. Providing a loop of heating cable two-thirds
of the way up the slope will provide a path for the extra melt water in this area to
escape.
1/3
2/3
2"–3"
4"–6"
Fig. 13 Layout for a roof/wall intersection.
• Extend a loop of heating cable two-thirds of the way up the slope adjacent to the
wall.
• Position the closest heating cable approximately 2 to 3 inches (5 to 8 cm) from the
wall. Position the second heating cable 4 to 6 inches (10 to 16 cm) from the first.
THERMAL MANAGEMENT
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Roof and Gutter De-icing ­— IceStop System
GUTTERS
Ice may accumulate in gutters and at the roof edge. To maintain a continuous
path for melt water to run off, route the heating cable as shown in Fig. 14 below.
Additional heating cable may be needed for the roof surface, downspouts, and
valleys.
Fig. 14 Layout in standard gutters — up to 6" (16 cm) wide
• Use one run of heating cable in the gutter.
• No attachment to gutter is normally required. If attachment is desired, use a roof
clip such as a Raychem GMK-RC clip.
• Continue heating cable down the inside of the downspout. See “Downspouts,”
page 15, for more information.
In wide gutters, snow and ice can bridge over the tunnel created by a single
heating cable and prevent melt water from getting into the gutter and downspouts.
To maintain a continuous path for melt water to run off, run the heating cable
in the gutter as shown in Fig. 15 below and follow the appropriate attachment
recommendations in “Step 6 Select attachment accessories and method” on
page 21. Additional heating cable may be needed for the roof surface, downspouts,
and valleys.
GM-RAKE
6" (15 cm) spacing
maximum
GMK-RC
Fig. 15 Layout in wide gutters — 6" to 12" (16 to 31 cm) wide
• Use two parallel runs of heating cable. Separate the two runs of heating cable
with a pair of GMK-RC clips or a single GM-RAKE downspout hanger bracket.
• No attachment to the gutter is normally required. If attachment is desired, use a
GMK-RC with appropriate adhesive.
• Continue heating cable down the inside of the downspout. See “Downspouts,”
page 15 for more information.
14 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
DOWNSPOUTS
Ice may form in downspouts and prevent melt water from escaping from the roof.
To maintain a continuous path for melt water to run off, run the heating cable
inside the downspout to the end as shown in Fig. 16 and Fig. 17 below. Follow the
appropriate attachment recommendations in “Step 6 Select attachment accessories
and method” on page 21. Additional heating cable may be needed for the roof
surface, gutters, and valleys.
Fig. 16 Heating cable at top of downspout
12"
Drain removes melt water
below the frost line.
Accumulated ice
can be removed.
Accumulated ice
may block drains.
Fig. 17 Heating cable at bottom of downspout
• If the downspout ends underground, the heating cable should extend into a
heated area or below the frost line.
• For low water-flow situations, teeing the heating cable so that a single run goes
down the downspout is usually sufficient. For high water-flow situations, where
ambient temperatures often fall below –10°F (–23°C), or where it isn’t convenient
to tee the heating cable, use two runs by running the heating cable down to the
bottom and then back to the top.
• Leave drip loops below the downspout at bottom.
• If a single run of heating cable is used, the end seal should be looped back up at
least 12 inches (30 cm) inside the downspout.
• If the downspout ends near the ground, water will refreeze on the ground and
build up around the downspout, eventually blocking the opening.
WARNING: To prevent mechanical damage, do not leave the end seal exposed
at the end of the downspout.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
15 / 40
Roof and Gutter De-icing ­— IceStop System
Example: Roof and Gutter De-Icing System
Type of roof
Sloped roof – standard with wood shingles and gutters
(from 1)
Layout
Roof edge
100 ft (30.5 m) (from Step 1)
Eave overhang
24 inch (60 cm) (from Step 1)
Requires 4.2 ft of heating cable per foot of roof edge
(4.2 m per meter of roof edge). See Table 2.
Gutters
Length
100 ft (30.5 m) (from Step 1)
= 100 ft (30.5 m) heating cable
Depth
6 in (11 cm) x 2 (from Step 1)
= 1 foot of additional heating cable 4.2 ft + 1 ft = 5.2 ft x 100 ft
= 520 ft (158.5 m) heating cable
Width
4 in (from Step 1)
therefore single run of heating cable at indicated gutter length
Roof valley
20 ft (6.1 m) (from Step 1) x 1.33 = 26.6
= rounded to 27 ft (8.3 m) heating cable
Downspouts
Two 12 ft (3.7 m) (from Step 1)
= 26 ft (8.0 m) heating cable
(Single runs in each downspout with 1 ft (0.3 m) loop back
from bottom)
Total heating cable length 673 ft (205.2 m)
Additional heating cable will be required for connection kits. After determining kit
requirements, heating cable allowances for each will be added to total heating cable
length for Bill of Materials.
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
Step 4 Determine the electrical parameters
This section will help you determine the electrical parameters for an IceStop system
including circuit breaker sizing and maximum circuit length. Total required heating
cable length divided by maximum heating cable circuit length will determine the
number of circuits required for your snow melting solution.
DETERMINE MAXIMUM CIRCUIT LENGTH
To determine maximum circuit length, it is important to establish a minimum
startup temperature for the system. Table 5 provides maximum circuit lengths
based on minimum startup temperature, circuit breaker rating and supply voltage.
Colder temperature startup requires shorter maximum circuit lengths. The use of
an automatic system, which energizes the system above 20°F (–7°C), ensures that
you can use maximum circuit lengths. Manual control systems may require you to
use shorter circuit lengths to compensate for startup below 20°F (–7°C).
8. Complete the Bill
of Materials
16 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Select the smallest appropriate circuit breaker size. A 30-mA ground-fault protection
device (GFPD) must be used to provide protection from arcing or fire, and to comply
with warranty requirements, agency certifications, and national electrical codes. If
the heating cable is improperly installed, or physically damaged, sustained arcing
or fire could result. If arcing does occur, the fault current may be too low to trip
conventional circuit breakers.
Table 5 MAXIMUM CIRCUIT LENGTH IN FEET (METERS)
Heating cable
GM-1X and -1XT at 120 V
GM-2X and -2XT at 208 V
GM-2X and -2XT at 240 V
GM-2X and -2XT at 277 V
Start-up
temperature
Circuit breaker size
15 A
20 A
30 A
40 A 1
–
Max.
A/ft (A/m)
32°F(0°C)
100
(30)
135(41)
200(61)
20°F(–7°C)
95
(29)
125(38)
185(56)
200(61)
0.126(0.414)
0°F(–18°C)
80
(24)
100(30)
155(47)
200(61)
0.150(0.492)
32°F(0°C)
190
(58)
250(76)
380(116)
20°F(–7°C)
180
(55)
235(72)
355(108)
380(116)
0.067(0.220)
0°F(–18°C)
145
(44)
195(59)
290(88)
380(116)
0.083(0.272)
32°F(0°C)
200
(61)
265(81)
400(122)
20°F(–7°C)
190
(58)
250(76)
370(113)
400(122)
0.063(0.207)
0°F(–18°C)
155
(47)
205(62)
305(93)
400(122)
0.077(0.253)
32°F(0°C)
215
(66)
290(88)
415(126)
20°F(–7°C)
200
(61)
265(81)
400(122)
415(126)
0.060(0.197)
0°F(–18°C)
165
(50)
225(69)
330(101)
415(126)
0.073(0.240)
–
–
–
0.120(0.394)
0.063(0.207)
0.060(0.197)
0.056(0.184)
1 Only FTC-P power connection, FTC-HST splice/tee, and RayClic-E end kits may be used with 40-A circuits.
WARNING: To minimize the danger of fire from sustained electrical arcing if
the heating cable is damaged or improperly installed, and to comply with the
requirements of Thermal Management, agency certifications, and national
electrical codes, ground-fault equipment protection must be used on each heating
cable branch circuit. Arcing may not be stopped by conventional circuit protection.
Example: Roof and Gutter De-Icing System
Startup temperature
20°F (–7°C) (from Step 1)
Circuit breakers
30 A
Supply voltage
208 V (from Step 1)
Maximum circuit length
355 ft (108 m) (from Table 5)
DETERMINE NUMBER OF CIRCUITS
Use the following formula to determine number of circuits for the system:
Number of circuits =
Heating cable length required
Maximum heating cable circuit length
Example: Roof and Gutter De-Icing System
THERMAL MANAGEMENT
Total heating cable length
673 ft (205.2 m) (from Step 3)
Maximum circuit length
355 ft (108 m) (from above)
Number of circuits
673 ft / 355 ft = 1.9 rounded to 2 circuits
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
17 / 40
Roof and Gutter De-icing ­— IceStop System
DETERMINE TRANSFORMER LOAD
The total transformer load is the sum of load on all the circuit breakers in the
system.
Calculate the Circuit Breaker Load (CBL) as:
CBL (kW) =
Circuit breaker rating (A) x 0.8 x Supply voltage
___________________________________________________
1000
If the CBL is equal on all circuit breakers, calculate the Total Transformer Load as
follows:
Total Transformer Load (kW) = CBL x Number of circuits
If the CBL is not equal on all circuit breakers, calculate the Total Transformer Load
as follows:
Total Transformer Load (kW) = CBL1 + CBL2 + CBL3 ...+ CBLn
Example: Roof and Gutter De-Icing System
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials
18 / 40
Circuit breaker load (CBL)
= (30 A x 0.8 x 208 V) / 1000 = 5 kW
Total transformer load
= 5 kW x 2 circuits = 10 kW
Step 5 Select the connection kits
A typical IceStop system may have several connection kits to seal and power the
heating cable. The connection kits work together with the IceStop heating cable to
provide a safe and reliable de-icing system that is easy to install and maintain. The
available accessories are listed in Table 6. A complete IceStop system also consists
of attachment accessories and adhesives which we discuss later in “Step 6 Select
attachment accessories and method” on page 21.
The self-regulating IceStop heating cable is cut to length at the job site. In order
to seal the heating cable from the environment and provide power, Thermal
Management approved connection kits must be used. A power connection kit is
required to attach power to one end of the heating cable. An end seal is required, and
is provided with each power connection to seal the other end. Splice and tee kits are
also available to connect two or three heating cables together.
RayClic and FTC connection kits are available for the IceStop system. The RayClic
connection kits are insulation-displacement quick connect systems. The FTC
connection kits use heat-shrinkable tubing and crimp barrels. All of these
connection kits are outlined in Table 6 below. Additional heating cable will be
required to allow for connection kit assembly and drip loops.
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Table 6 CONNECTION KITS Catalog
number
Description
Standard
packaging
Usage
Heating cable
allowance 1
Connection kits
RayClic-PC
Power connection and end seal
(RayClic-SB-04 pipe mounting
bracket included)
1
1 per circuit
2 ft (0.6 m)
RayClic-PS
Powered splice and end seal
(RayClic-SB-04 pipe mounting
bracket included)
1
1 per circuit
4 ft (1.2 m)
RayClic-PT
Powered tee and end seal
(RayClic-SB-04 pipe mounting
bracket included)
1
1 per circuit
6 ft (1.8 m)
FTC-P2
Power connection and end seal
1
1 per circuit
2 ft (0.6 m)
Note: FTC-P is required for
circuits requiring 40 A circuit
breakers.
RayClic-S
Splice
1
As required
2 ft (0.6 m)
RayClic-T
Tee kit with end seal
1
As required
3 ft (0.9 m)
RayClic-X
Cross connection to connect
four heating cables
1
As required
8 ft (2.4 m)
FTC-HST3
Low-profile splice/tee
2
As required
2 ft (0.6 m)
RayClic-LE
Lighted end seal
(RayClic-SB-04 pipe
mounting bracket included)
1
Alternate end seal
2 ft (0.6 m)
RayClic-E
Extra end seal
1
Additional end seal
0.3 ft (0.1 m)
1
Required for every
RayClic connection
kit
Accessories
RayClic-SB-02
Wall mounting bracket
–
1 Additional heating cable required for connection kit assembly and drip loops.
2 Junction box not included.
3 One RayClic-E end seal is required for each FTC-HST used as a tee kit.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
19 / 40
Roof and Gutter De-icing ­— IceStop System
Example: Roof and Gutter De-Icing System
Connection kit
Quantity
Heating cable allowance
RayClic-PC
2
4 ft (1.2 m)
RayClic-PS
2
8 ft (2.4 m)
RayClic-SB-02
4
NA
Determine how much additional heating cable you need for the connection kits.
Example: Roof and Gutter De-Icing System
20 / 40
Sloped roof – standard
520 ft (158.5 m)
Gutters
100 ft (30.5 m)
Roof valley
27 ft (8.3 m)
Downspouts
26 ft (8.0 m)
Total heating cable allowance for connection kits
12 ft (4.0 m)
Total heating cable length required
685 ft (208.8 m)
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Roof and Gutter
De-Icing
Step 6 Select attachment accessories and method
A typical IceStop system also consists of various attachment accessories and
adhesives for attaching the heating cable to the roof. The available accessories are
listed in Table 7 and the adhesives in Table 9. The type of attachment accessories you
need will depend on the type of roof you have. See Table 8 for details.
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
Always check with the roofing manufacturer for recommendations on how to
attaching heating cables to their roofing material.
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials
Table 7 ATTACHMENT ACCESSORIES
Catalog
number
Description
Standard
packaging
GMK-RC
Roof clips
50/box
1 box per 35' of roof edge when
zig-zag layout is used.
See Table 8 for other layout
options.
–
GMK-RAKE
Hanger bracket
1
1 hanger per cable in downspout or as required for mechanical protection.
See Table 8 for other layout
options.
–
CT-CABLE-TIE
UV-resistant cable tie
100/box
As required.
–
CCB-CU
CCB-AL
Cable cover bracket,
copper or aluminum
1
As required.
–
THERMAL MANAGEMENT
Usage
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
Heating cable
allowance
21 / 40
Roof and Gutter De-icing ­— IceStop System
Heating cable attachment depends primarily upon the roof type. The following table
shows the recommended attachment methods for typical roof materials and roof
areas.
Table 8 ATTACHMENT METHODS FOR TYPICAL ROOFS
Recommended
attachment method
Roof material
Alternate attachment
method
Shake/shingle
“Mechanical Attachment,”
page 23
Rubber/membrane
“Belt Loop Approach,” page 24
“Adhesive Attachment,”
page 23
Metal
“Mechanical Attachment,”
page 23
“Adhesive Attachment,”
page 23
“Belt Loop Approach,”
page 24
Wood
“Mechanical Attachment,”
page 23
Other
“Attachment Methods for Other
Areas,” page 25
Area
Attachment method
Gutters
Recommend using hanger clips
glued to gutter for security if
possible (see page 25)
Downspouts
Downspout hangers (page 25)
Drip edges
Attached to a flat sheet or
standard drip edge, or installed
informed sheet metal (see
page 26)
Component locations
Drip loops
Roof edges with
no gutter
Drip loops
Note: Do not use adhesives on slate or tile roofs. Please contact roofing manufacturer for
a recommended attachment method or contact your Thermal Management representative.
Adhesive is not supplied by Thermal Management. Follow manufacturer’s
instructions for surface preparation and installation.
Table 9 ADHESIVES
Adhesive
Description
Color
Approximate Cure
tooling time time
Dispensing
equipment
Momentive
Performance
Materials, Inc.
RTV167
Neutral-cure
silicone adhesive
Gray
20 minutes
48 hours Caulking gun
SpeedBonder®
H3300
Methacrylate
adhesive
Tan
15 minutes
24 hours 2 part mixing
dispenser
SpeedBonder
H4800
Methacrylate
adhesive
Light
yellow
45 minutes
24 hours 2 part mixing
dispenser
Plexus® MA300
Methacrylate
adhesive
Yellow
15 minutes
16 hours 2 part mixing
dispenser
Plexus MA310
Methacrylate
adhesive
Yellow
30 minutes
16 hours 2 part mixing
dispenser
Note: Before using adhesives on metal roofs check with the roofing manufacturer.
Trademarks are the property of their respective owners.
22 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
ROOF ATTACHMENT METHODS
Mechanical Attachment
One of the most common attachment methods is to use Raychem GMK-RC roof
clips. It can be used on all surfaces where nails or screws are acceptable.
Fig. 18 GMK-RC clip attachment
• The GMK-RC roof clips are used to secure IceStop heating cable. This
multipurpose bracket attaches with a screw, nail, or adhesive to many types of
roofs and gutters.
• One box of 50 GMK-RC roof clips is sufficient to attach the heating cable on 35
feet (9.1 m) of roof edge using a zig-zag layout. Your layout may require additional
clips.
• For layouts other than the standard zig-zag, use one clip for each 5 to 10 feet (1.5
to 3 m) of unsupported heating cable and at every change of heating cable direction.
• For standard sloped roofs, the loops of heating cable being zig-zag on the roof
should be attached using a UV-resistant cable tie to the heating cable run in the
gutter.
• For standing-seam roofs, the heating cable should be cable-tied together at the
bottom of the seam.
• For high wind areas, it is recommended to use a UV resistant cable tie to further
secure the heating cable to the attachment clip.
Adhesive Attachment
For roofs where penetrating attachments are not desired, use the GMK-RC roof clip
attached by adhesive.
Fig. 19 GMK-RC clip on standing-seam roof
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
23 / 40
Roof and Gutter De-icing ­— IceStop System
Fig. 20 GMK-RC clip on flat roof
• The GMK-RC roof clips are used to secure IceStop heating cable. The clip
attaches with adhesive (not supplied by Thermal Management) to many types of
roofs and gutters.
• Several different adhesives are recommended by Thermal Management. See
Table 9 on page 22 or contact Thermal Management for alternatives.
• On a standing seam roof, use four clips on each seam being traced. On a flat surface, use one clip for every 5 to 10 feet (1.5 to 3 m) of unsupported heating cable
and at every change of direction.
• Follow all recommendations from the adhesive manufacturer with regard to
cleaning and preparing the roof surface for the adhesive.
Belt Loop Approach
With the belt loop approach, strips of roofing materials are fastened to the roof
using standard means for that particular type of roof. The heating cable is attached
with a UV‑resistant cable tie to the loop formed by this material.
Strip of roof
material
Roof
adhesive
Heating
cable
Cable tie
Fig. 21 Belt loop approach on a sloped roof
Fig. 22 Belt loop approach on a flat roof
24 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
• The belt loop method of securing the IceStop heating cable involves using a small
piece of roofing material to form a “belt loop.”
• Use at least one belt loop for every 5 to 10 feet (1.5 to 3 m) of unsupported heating
cable and at every heating cable change of direction.
ATTACHMENT METHODS FOR OTHER AREAS
Gutters
Attachment is not generally required for standard gutters. If attachment is desired,
such as in high-wind areas, use GMK-RC adhesive-mounted attachment clips.
Several different adhesives are recommended by Thermal Management. See Table 9
on page 22.
For large gutters (6 to 12 inches wide [15 cm to 30 cm]), use two runs of heating
cable separated by GMK-RC roof clips. It is not necessary to attach the clips to the
gutter. Use one pair of GMK-RC roof clips for every 10 feet (3 m).
GM-RAKE
6" (15 cm) spacing
maximum
GMK-RC
Fig. 23 GMK-RC clip in a gutter
Downspouts
The IceStop heating cable needs to be attached at the top of each downspout, using
one GM‑RAKE downspout hanger per heating cable. The GM-RAKE downspout
hanger clamps around the heating cable and attaches to the fascia with a screw or
nail.
Fig. 24 GM-RAKE downspout hangers
• GM-RAKE downspout hangers protect the heating cable from damage from sharp
edges and also provide support for the weight of the heating cable.
• Use two GM-RAKE downspout hangers for double-traced downspouts.
• Attach the GM-RAKE downspout hangers to the structure with a nail or other
suitable method.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
25 / 40
Roof and Gutter De-icing ­— IceStop System
Heated Drip Edges
When installing a heated drip edge, you can attach the heating cable to the roof’s
drip edge or to a flat sheet of sheet metal with a UV-resistant cable tie, or place the
heating cable in a formed (J-channel) piece of sheet metal.
Roofing material
Metal drip edge
IceStop heating cable
UV-resistant cable tie
Attached to flat sheet
UV-resistant cable tie
Attached to standard drip edge
2 3/4" (7 cm)
1/4" (0.6 cm) Installed in a formed sheet
3/4" (1.9 cm)
Fig. 25 Heated drip edge attachment guidelines
• The illustrations above are guidelines for heating cable attachment in a heated
drip edge application. Thermal Management does not manufacture drip edge
attachment clips.
• Use 20-gauge or thicker corrosion-resistant sheet metal.
• Contact your Thermal Management representative or Thermal Management directly for specific recommendations.
Example: Roof and Gutter De-Icing System
100 ft (30.5 m) roof edge and 2 gutters
26 / 40
GMK-RC
3 boxes of 50
GM-RAKE
2
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Roof and Gutter
De-Icing
Step 7 Select the control system and power distribution
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials
CONTROL SYSTEMS
Three control methods are commonly used with roof de-icing systems:
• Manual on/off control
• Ambient thermostat
• Automatic moisture/temperature controller
All three methods require contactors if any significant length of heating cable is
being used. The contactor must be sized to carry the load. Each method offers
a trade-off of initial cost versus energy efficiency and ability to provide effective
de-icing. If the system is not energized when needed, ice will form. If the system
is energized when de-icing is not needed, there will be unnecessary power
consumption. Choose the control method that best meets the project performance
requirements. Contact your Thermal Management representative for details.
For Class I, Division 2 hazardous locations, use an agency-approved controller or
thermostat suitable for the same area use.
Manual On/Off Control
A manually controlled system is operated by a switch that controls the system
power contactor. This method requires constant supervision to work effectively. A
manual system can be controlled by a building management system.
Ambient Thermostat
When an ambient sensing thermostat is used, the roof and gutter system will be
energized when the ambient temperature is below freezing. This will ensure the
heating cable is energized any time the water might freeze.
Table 10 ECW-GF THERMOSTAT
Number of heating cable
circuits
Single
Sensor
Thermistor
Sensor length
35 ft
Set point range
32°F to 200°F (0°C to 93°C)
Enclosure
NEMA 4X
Deadband
2°F to 10°F (2°C to 6°C)
Enclosure limits
–40°F to 140°F (–40°C to 60°C)
Switch rating
30 A
Switch type
DPST
Electrical rating
100−277 V
Approvals
c-UL-us Listed
Ground-fault protection
30 mA fixed
Alarm outputs
AC relay
2 A at 277 Vac
Dry contact relay
THERMAL MANAGEMENT
2 A at 48 Vdc
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
27 / 40
Roof and Gutter De-icing ­— IceStop System
Automatic Moisture/Temperature Controller
The most conservative approach from an energy-consumption point of view is
an automatic moisture/temperature sensor. Thermal Management supplies an
automatic moisture/temperature sensor, which consists of a control panel, one or
more gutter sensors, and one or more aerial snow sensors. Table 11 outlines the
options for this approach.
The gutter sensor should be mounted in gutters near downspouts. It senses the
actual environmental conditions, such as temperature and moisture. A gutter
sensor is recommended for each critical area that needs to be monitored for icing
conditions (such as when one side of a building gets sun in the morning and the
other side gets sun in the afternoon, or one side gets the prevailing winds and the
other side is protected). An aerial-mounted snow sensor is also recommended.
Having both gutter and snow sensors allows for snow to begin melting in the gutters
at the onset of any snow or ice condition.
For areas where a large number of circuits are required, the Raychem ACS-30
can be used. The Roof & Gutter De-icing control mode in the ACS-30 includes
an External Device control option. This option allows a Snow/Moisture sensing
controller (from Table 11) to be integrated into the ACS-30 system. Note that sensors
(snow or gutter) cannot be directly connected to the ACS-30 system. Refer to the
ACS-30 Programming Guide (H58692) for more information on system setup.
Table 11 AUTOMATIC CONTROLLERS
Application
APS-3C
APS-4C
SC-40C
PD Pro
GF Pro
Snow controller
Snow controller
with ground-fault
protection
Satellite contactor
Snow controller
Snow controller
with ground-fault
protection
Number of sensors
1 to 6
1 to 6
1 to 6
1 to 2
1 to 2
Set point
38°F (3°C) and
moisture
38°F (3°C) and
moisture
38°F (3°C) and
moisture
38°F (3°C) and
moisture
38°F (3°C) and
moisture
High limit
temperature set
point
40°F to 90°F (4°C to 40°F to 90°F (4°C to 40°F to 90°F (4°C to NA
32°C) adjustable
32°C) adjustable
32°C) adjustable
NA
Enclosure
NEMA 3R
NEMA 3R
NEMA 3R
NEMA 4X
NEMA 4X
Temperature
operating limits
–40°F to 160°F
(–40°C to 71°C)
–40°F to 160°F
(–40°C to 71°C)
–40°F to 160°F
(–40°C to 71°C)
–31°F to 130°F
(–35°C to 55°C)
–31°F to 130°F
(–35°C to 55°C)
Electrical rating
24 A, 120 V
24 A, 208–240 V
50 A, 208–240 V
40 A, 277 V
50 A, 277–480 V
50 A, 600 V
50 A, 208/240 V
40 A, 277 V
50 A, 277–480 V
50 A, 600 V
30 A, 120 V
30 A, 208-277 V
Approvals
c-UL-us Listed
c-UL-us Listed
c-UL-us Listed
c-UL-us Listed
c-UL-us Listed
Ground-fault
protection
Not included
30 mA
30 mA, 60 mA and
120 mA
Not included
30 mA
Table 12 MOISTURE/TEMPERATURE SENSORS
Application
Set point
28 / 40
GIT-1
CIT-1
Gutter-mounted
moisture/temperature
Aerial-mounted
moisture/temperature
38°F (3°C)
38°F (3°C)
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Table 13 CONTROL SYSTEMS Catalog number
Description
Electronic Thermostats and Accessories
ECW-GF
Electronic ambient sensing controller with 30-mA ground-fault protection. The controller can be programmed to maintain temperatures up to 200°F (93°C) at voltages from
100 to 277 V and can switch current up to 30 Amperes. The ECW-GF is complete with
a 25-ft (7.6-m) temperature sensor and is housed in a NEMA 4X rated enclosure. The
controller features an AC/DC dry alarm contact relay.
ECW-GF-DP
An optional remote display panel (ECW-GF-DP) can be added to provide ground-fault
or alarm indication in applications where the controller is mounted in inaccessible
locations.
Snow Melting Controllers
APS-3C
Automatic snow melting controller housed in a NEMA 3R enclosure provides effective,
economical automatic control of all snow melting applications. CSA Certified, c-UL-us
Listed, available in 120 V and 208-240 V, 50/60 Hz models, 24-Amp DPDT output relay,
adjustable hold-on timer.
Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)
APS-4C
Automatic snow melting controller housed in a NEMA 3R enclosure provides effective,
economical automatic control of all snow melting applications. The APS-4C can
operate with any number of SC-40C satellite contactors for larger loads. Features
include: 277 V single-phase or 208–240, 277/480, and 600 V three-phase models,
built-in 3-pole contactor, integral 30 mA ground-fault circuit interrupter and an
adjustable hold-on timer.
Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6-9/16 in (292 mm x 232 mm x 167 mm)
SC-40C
Satellite contactor power control peripheral for an APS-4C snow melting controller,
housed in a NEMA 3R enclosure. Features include: 277 V single-phase or 208–240,
277/480 and 600 V three-phase models, built-in 3-pole contactor and integral 30 mA
ground-fault circuit interrupter.
Enclosure dimensions: 11-1/2 in x 9-1/8 in x 6 in (292 mm x 232 mm x 152 mm)
Gutter De-Icing Controllers
HE
AT
ER
CY
CL
PD Pro
Automatic snow and ice melting controller for pavement, sidewalks, loading docks,
roofs, gutters and downspouts in commercial and residential environments.
The PD Pro interfaces with up to two sensors, (any combination of CIT-1, GIT-1 or SIT6E) to meet site requirements. The PD Pro is housed in an environmentally-sheltered
Type 4X enclosure and weighs only 3 pounds.
GF Pro
Automatic snow and ice melting controller for pavement, sidewalks, loading docks,
roofs, gutters and downspouts in commercial and residential environments.
The GF Pro interfaces with up to two sensors, (any combination of CIT-1, GIT-1 or SIT6E) to meet site requirements. The GF Pro is housed in an environmentally-sheltered
Type 4X enclosure and weighs only 3 pounds.
E
Features a built-in 30 mA, self-testing Ground-Fault Equipment Protection (GFEP)
capability, digitally filtered to minimize false tripping. A ground-fault alarm must be
manually reset using the Test/Reset switch before heater operation can continue.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
29 / 40
Roof and Gutter De-icing ­— IceStop System
Table 13 CONTROL SYSTEMS Catalog number
Description
Snow Melting and Gutter De-Icing Sensors and Accessories
CIT-1
Overhead snow sensor that detects precipitation or blowing snow at ambient temperatures below 38°F (3.3°C). For use with an APS-3C or APS-4C automatic snow
controller, or an SC-40C satellite contactor.
GIT-1
Gutter sensor that detects moisture at ambient temperatures below 38°F (3.3°C).
For use with an APS-3C or APS-4C automatic snow controller, or a SC-40C satellite
contactor.
RCU-3
The RCU–3 provides control and status display to the APS–3C controller from a
remote location. It has a 2, 4, 6 or 8 hour CYCLE TIME adjustment, independent of
APS-3C setting.
RCU-4
The RCU–4 provides control and status display to the APS–4C controller and SC-40C
Satellite Contactor from a remote location. It has a 2, 4, 6 or 8 hour CYCLE TIME
adjustment, independent of the APS-4C or SC-40C setting.
Electronic Controllers
A0
A1
A2
A3
A4
A5
A6
A7
ACS-UIT2
ACS-PCM2-5
The Raychem ACS-30 Advanced Commercial Control System is a multipoint electronic
control and monitoring system for heat-tracing used in various commercial applications such as pipe freeze protection, roof and gutter de-icing, surface snow melting,
hot water temperature maintenance and floor heating. The Raychem ACS-30 system
can control up to 260 circuits with multiple networked ACS-PCM2-5 panels, with a
single ACS-UIT2 user interface terminal. The ACS-PCM2-5 panel can directly control
up to 5 individual heat-tracing circuits using electro-mechanical relays rated at 30 A
up to 277 V.
ProtoNode-RER
The Raychem ProtoNode is an external, high performance multi-protocol gateway for
customers needing protocol translation between Building Management Systems (BMS)
and the Raychem ACS-30 or C910-485 controllers.
RTD-200
RTD3CS
RTD10CS
RTD50CS
Stainless steel jacketed three-wire RTD (Resistance Temperature Detector) used with
Raychem C910-485 and ACS-30 controllers.
PROTOCESSOR
SERIAL ETHERNET
PROTONODE
B0
B1
B2
B3
S0
S1
S2
S3
By FieldServer Technologies
www.ProtoCessor.com
RS 485 GND
RS 485 RS 485+
+PWR
- PWR
FRAME GND
RTD-200: 3-in (76 mm) temperature sensor with a
6-ft (1.8 m) lead wire and 1/2-in NPT bushing
RTD3CS: temperature sensor with a 3-ft (0.9 m) flexible armor,
18-in (457 mm) lead wire and 1/2-in NPT bushing
RTD10CS: temperature sensor with a 10-ft (3 m) flexible armor,
18-in (457 mm) lead wire and 1/2-inch NPT bushing
RTD50CS: temperature sensor with a 50-ft (3 m) flexible armor,
18-in (457 mm) lead wire and 1/2-in NPT bushing
30 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Example: Roof and Gutter De-Icing System
208 V system with 2 circuits
APS-4C
1
SC-40C
1
GIT-1
2 (one for each gutter section)
CIT-1
1
POWER DISTRIBUTION
Once the heating cable circuits and control have been defined, you must select
how to provide power to them. Power to the IceStop heating cables can be provided
in several ways: directly through the controller, through external contactors, or
through SMPG power distribution panels.
Single circuit control
Heating cable circuits that do not exceed the current rating of the selected control
device shown in Table 11 can be switched directly (see Fig. 26).
Group control
If the current draw exceeds the switch rating, or if the controller will activate more
than one circuit (group control), an external contactor must be used.
Note: Large systems with many circuits should use an SMPG power distribution
panel. The SMPG is a dedicated power-distribution, control, ground-fault protection,
monitoring, and alarm panel for roof and gutter de-icing applications. This enclosure
contains an assembled circuit-breaker panelboard. Panels are equipped with
ground-fault circuit breakers with or without alarm contacts. The group control
package allows the system to operate automatically in conjunction with an ambientsensing thermostat, individual electronic, or duty cycle controller.
Table 14 POWER DISTRIBUTION PANELS
Application
SMPG1
Control panel
THERMAL MANAGEMENT
Controller
EUR-5A included
Number of sensors
Up to 6
Enclosure
NEMA 1/12, NEMA 3R/4
Temperature operating
limits
Without space heater
14°F to 122°F
(–10°C to 50°C)
With a space heater
–40°F to 122°F
(–40°C to 50°C)
Supply voltage
208 V, 277 V
Circuit breaker rating
15 A, 20 A, 30 A, 40 A, 50 A
Approvals
c-UL-us
Ground-fault protection
Yes
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
31 / 40
Roof and Gutter De-icing ­— IceStop System
Single circuit control
Group control
Temperature
controller
ø
Heating
cable
Temperature
controller
1 ø supply
N
ø
1-pole
GFEP breaker
1
1-pole
GFEP breaker
C
ø supply
N
ø
ø
ø
1
G
2
Heating cable
sheath, braid
or ground
3-phase 4-wire
supply (WYE)
3
Contactor
3-pole main
breaker
N
G (Typ 3)
Heating cable
sheath, braid
or ground
Fig. 26 Single circuit and group control
Main circuit breaker
(optional)
Fuse
Aerial snow sensor
Gutter ice sensor
High
temperature
sensor
Control transformer
G
N
Ø1
Ø2
Ø3
GIT-1
EUR-5A SNOW SWITCH
24 V
3-phase 4-wire
supply (WYE)
4
AUTOMATIC SNOW/ICE MELTING CONTROL PANEL
6
2
SUPPLY
SNOW/ICE
8
10
0
HEATER
CYCLE
HOURS
CIT-1
HEATER
TEMPERATURE
One-pole with 30 mA
ground-fault trip (277 V)
Three-pole
main contactor
Remote annunciation alarm
(circuit breaker
with alarm type #3)
Heating cable
sheath, braid
or ground
Single Ø
connection
Fig. 27 Typical wiring diagram of group control with SMPG1
32 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Table 15 POWER DISTRIBUTION
Catalog number
Description
Power Distribution and Control Panels
SMPG1
Single-phase power distribution panel that includes ground-fault protection, monitoring, and control for snow melting systems. Single-phase voltages include 208 and
277 V.
NP
NP
NP
NP
NP
NP
NP
Roof and Gutter
De-Icing
Step 8 Complete the Bill of Materials
1. Determine design
conditions
If you used the Design Worksheet to document all your project parameters, you
should have all the details you need to complete your Bill of Materials.
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
8. Complete the Bill
of Materials
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
33 / 40
Roof and Gutter De-icing ­— IceStop System
ICESTOP SYSTEM ROOF AND GUTTER DE-ICING DESIGN WORKSHEET
Step  Determine design conditions
Type of roof
Layout
Supply
voltage
❑ Sloped roof – standard
Roof edge
❑ 120 V
❑ Sloped roof – standing seam
Length of roof edge (ft/m)___________
❑ 208–277 V
❑ Flat roof
Number of edges Roof material
Eave overhang
❑ Shake/shingle
Min. start-up
temperature
Control method
❑ Manual on/off control
______ (°F/°C)
❑ Ambient thermostat
___________
❑ Automatic controller
Distance of overhang (in/cm)________
Gutters
❑ Rubber membrane
❑ Metal
❑ Wood
❑ Other: __________________
Length of gutters (ft/m) ___________
Number of gutters
Depth of gutters (in/cm) ___________
Width of gutters (in/cm) ___________
___________
Roof valley
Height of roof valley (ft/m)___________
Number of roof valleys
___________
Roof/wall intersection
Height of intersection (ft/m)_________
Number of intersections ___________
Downspouts
Downspout height (ft/m) ___________
Number of downspouts ___________
Example:
9 Sloped roof – standard with wood shingles and gutters
Roof edge:
50 ft
Length of roof edge
2
x
Number of edges
=
100 ft
Total length of roof edges
Eave overhang: 24 in
Gutters:
50 ft
Length of gutter
x
2
Number of gutters
=
100 ft
Total length of gutters
6 in
Depth of gutter
4 in
Width of gutter
Roof valley:
20 ft
1
Height of roof valley
Number of roof valleys
Downspouts:
12 ft
Downspout height
x
2
Number of downspouts
=
24 ft
Total downspout height
Supply voltage: 208 V
Minimum start-up temperature: 20°F
Control method: Automatic controller
34 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Step  Select the heating cable
See Fig. 4.
Product family
Use catalog number:
THERMAL MANAGEMENT
Outer jacket
T 1 = 120 V
T -X polyolefin
T 2 = 208, 240, 277 V
T -XT fluoropolymer
GM
Product family
Example catalog number:
Supply voltage
—
Supply voltage
GM
2
Product family
Supply voltage
Outer jacket
Catalog number
XT
GM-2XT
Outer jacket
Catalog number
—
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
35 / 40
Roof and Gutter De-icing ­— IceStop System
Step  Determine the heating cable length Sloped roof – standard
with
requires
Roof edge (ft/m)
Eave overhang (in/cm)
Heating cable per foot of roof edge
(ft/m)
Sloped roof – standing seam
with
requires
Roof edge (ft/m)
Eave overhang (in/cm)
Flat roof
x
Roof perimeter (ft/m)
From perimeter to drains (ft/m)
Heating cable per foot of roof edge
(ft/m)
=
x
Gutters
Gutter depth (ft/m)
x
2
=
x
Roof edge (ft/m)
+
Additional heating cable (ft/m)
Heating cable per foot
of roof edge (ft/m)
Height of roof valley (ft/m)
=
=
Gutter width multiplier
=
x 1.33 x
Roof/wall intersection
Height of intersection (ft/m)
x 1.33
Downspouts
x
Height of downspouts (ft/m)
=
Number of roof valleys
=
Number of intersections
Number of downspouts
x
Heating cable with gutter
depth allowance (ft/m)
Total heating cable for roof edge (ft/m)
No gutters – heated drip edge
x 1
Roof edge (ft/m)
Roof valleys
=
Heating cable with gutter depth allowance (ft/m)
x
Gutter length (ft/m)
Heating cable for flat roof
(ft/m)
Into internal downspouts (ft/m)
Runs of heating cable
per downspout
=
Heating cable for gutters (ft/m)
Heating cable for heated drip edge (ft/m)
Heating cable for roof valleys (ft/m)
Heating cable for
roof/wall intersections (ft/m)
Heating cable per downspout (ft/m)
Total heating cable length
Example: Sloped roof – standard with eave overhang and gutters
100 ft
Feet of roof edge (ft/m)
6 in
Gutter depth (ft/m)
x
100 ft
Roof edge (ft/m)
100 ft
Gutter length (ft/m)
24 in
with
2
=
Additional heating cable (ft/m)
+
4.2 ft
Heating cable per foot
of roof edge (ft/m)
1
=
Gutter width multiplier
x 1.33 x
12 ft
Height of downspouts (ft/m)
x
1
=
Number of roof valleys
2
Number of downspouts
5.2 ft
=
Heating cable with gutter
depth allowance (ft/m)
520 ft *
=
Total heating cable for roof edge (ft/m)
Heating cable with gutter
depth allowance (ft/m)
x
Height of roof valley (ft/m)
1 ft
Heating cable per foot of roof edge (ft/m)
5.2 ft
x
20 ft
Eave overhang (in/cm)
4.2 ft
requires
x
+
1
Runs of heating cable
per downspout
2
Drip loop allowance
(1 ft with loopback)
=
=
100 ft *
Heating cable for gutters (ft/m)
26.6 ft rounded to 27 ft *
Heating cable for roof valleys (ft/m)
24 ft
Heating cable per downspouts (ft/m)
26 ft *
Feet heating cable for downspouts
=
36 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
673 ft
* Total heating cable length
THERMAL MANAGEMENT
Step  Determine the electrical parameters Determine maximum circuit length and number of circuits (See Table 5)
Supply voltage: T 120 V
T 240 V
Total heating cable
length required
Circuit breaker size: T 15 A
T 30 A
Total heating cable length required
/
T 208 V
T 277 V
T 20 A
T 40 A
Start-up temperature
Maximum circuit length
=
Maximum heating cable circuit length
Number of circuits
Determine transformer load
Calculate the circuit breaker load (CBL)
(
x
Circuit breaker rating
0.8 x
Supply voltage
)
/ 1000
=
Circuit breaker load (kW)
If the CBL is equal on all circuits, calculate the transformer load as:
x
Circuit breaker load (kW) Number of breakers
=
Total transformer load (kW)
If the CBL is NOT equal on all circuits, calculate the transformer load as:
=
Total transformer load (kW)
CBL1 + CBL2 + CBL3... + CBLN
Example:
Determine the maximum circuit length and number of circuits
Supply voltage: T 120 V
T 240 V
673 ft of GM-2XT
Total heating cable
length required
Circuit breaker size: T 15 A
9 30 A
T
673 ft
/
Total heating cable length required
9 208 V
T
T 277 V
T 20 A
T 40 A
Start-up temperature
20°F
Maximum circuit length
355 ft
355 ft
1.9 circuits, round up to 2
=
Number of circuits
Maximum heating cable circuit length
Determine transformer load
(
30 A
x
Circuit breaker rating
5 kW
Circuit breaker load (kW)
x
THERMAL MANAGEMENT
0.8
208 V
x
Supply voltage
)
/ 1000
2
Number of breakers
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
=
4.99 kW rounded to 5 kW
Circuit breaker load (kW)
10 kW
=
Total transformer load (kW)
37 / 40
Roof and Gutter De-icing ­— IceStop System
Step  Select the connection kits (See Table 6) Connection kits and
accessories
Description
Quantity
Heating cable
allowance
❑
RayClic-PC
Power connection and end seal
_____________
__________________
❑
RayClic-PS
Power splice and end seal
_____________
__________________
__________________
❑
RayClic-PT
Powered tee and end seal
_____________
❑
FTC-P
Power connection and end seal
_____________
__________________
__________________
❑
RayClic-S
Splice
_____________
❑
RayClic-T
Tee kit with end seal
_____________
__________________
__________________
❑
RayClic-X
Cross connection
_____________
❑
FTC-HST
Low-profile splice/tee
_____________
__________________
__________________
❑
RayClic-LE
Lighted end seal
_____________
❑
RayClic-E
Extra end seal
_____________
__________________
Wall mounting bracket
_____________
__________________
❑
RayClic-SB-02
Total heating cable
allowance for connection kits
Total heating cable length
+
Total heating cable allowance for connection kits
=
Total heating cable
length required
Example:
Quantity
Heating cable
allowance
9 RayClic-PC
2
4 ft
9 RayClic-PS
2
8 ft
9 RayClic-SB-02
4
NA
Connection kit catalog number
12 ft
Total heating cable
allowance for connection kits
673 ft
Total heating cable length
+
12 ft
Total heating cable allowance for connection kits
=
685 ft
Total heating cable
length required
Step  Select attachment accessories and method
See “Table 7 Attachment Accessories” “Table 8 Attachment Methods for Typical Roofs” and “Table 9 Adhesives”
Adhesive is not supplied by Thermal Management
Attachment accessories
Description
Quantity
GMK-RC
Roof clips
____________
❑
GMK-RAKE
Hanger bracket
____________
❑
CT-CABLE-TIE
UV-resistant cable tie
____________
CCB
Cable cover bracket, copper or aluminum
____________
❑
❑
Example:
100 ft roof edge and 2 gutters
9 GMK-RC
3 boxes of 50 (from Table 7)
9 GM-RAKE
2 (from Table 7)
38 / 40
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
THERMAL MANAGEMENT
Step  Select the control system and power distribution Control Systems
See “Table 10 ECW-GF Thermostat” “Table 11 Automatic Controllers” “Table 12 Moisture/Temperature Sensors” “Table 13 Control Systems”
Thermostats, controllers
and accessories
Description
Quantity
❑
ECW-GF
Electronic thermostat with 25-ft sensor
____________
❑
APS-3C
Automatic snow melting controller
____________
❑
APS-4C
Automatic snow melting controller
____________
❑
SC-40C
Satellite contactor
____________
❑
PD Pro
Gutter de-icing controller
____________
❑
GF Pro
Gutter de-icing controller
____________
❑
CIT-1
Overhead snow sensor
____________
❑
GIT-1
Gutter sensor
____________
❑
RCU-3
Remote control unit for APS-3C
____________
❑
RCU-4
Remote control unit for APS-4C
____________
❑
ACS-UIT2
ACS-30 user interface terminal
____________
❑
ACS-PCM2-5
ACS-30 power control panel
____________
❑
ProtoNode-RER
Multi-protocol gateway
____________
❑
RTD3CS
Resistance temperature device for Raychem ACS-30
____________
❑
RTD10CS
Resistance temperature device for Raychem ACS-30
____________
❑
RTD200
Resistance temperature device for Raychem ACS-30
____________
❑
RTD50CS
Resistance temperature device for Raychem ACS-30
____________
Example:
Supply voltage
208 V (from Step 1)
Controller(s)
9 APS-4C
1
9 SC-40C
1
2 (one for each gutter section)
1
Snow melting and gutter de-icing
sensors and accessories
9 GIT-1
9 CIT-1
Power distribution
See “Table 14 Power Distribution Panels” and “Table 15 Power Distribution”
Power distribution and control
panels
❑
SMPG1
Description
Quantity
Single-phase power distribution panel
____________
Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
39 / 40
WWW.PENTAIRTHERMAL.COM
NORTH AMERICA
Tel:+1.800.545.6258
Fax:+1.800.527.5703
Tel:+1.650.216.1526
Fax:+1.650.474.7711
[email protected]
Pentair is owned by Pentair or its global affiliates. All other trademarks are the property of their respective owners. Pentair reserves the right to
change specifications without prior notice.
© 2009-2017 Pentair.
THERMAL MANAGEMENT
Raychem-DG-H56070-IceStopRoofGutterDeIcingCOM-EN-1707
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