Roof and Gutter De-Icing
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing
2. Roof and Gutter
De-Icing
IceStop™ System
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.
7. Technical Data
Sheets
•
6. Floor Heating
Raychem IceStop is a roof and gutter de-icing system that provides drain paths for the
following applications:
5. Freezer Frost Heave
Prevention
Introduction
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
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 . . . . . . . . . . . . . . . . . . . . . . . . . .20
Step 7 Select the control system and power distribution. . . . . . . . . . . . . . . . . . . . . .26
Step 8 Complete the Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
IceStop System Roof and Gutter De-Icing Design Worksheet . . . . . . . . . . . . . . . . . . . . . . .33
3. Surface Snow
Melting and
Anti-Icing–MI
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
Tyco Thermal Controls representative or phone Tyco Thermal Controls at (800) 545-6258.
Also, visit our web site at www.tycothermal.com.
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.
For the names of manufacturers of snow guards or snow fences, contact your Tyco Thermal
Controls representative, or contact Tyco Thermal Controls directly at (800) 545-6258.
•
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1 of 38
9. Index
H56070
Melting snow on a roof and/or reduction of snow load — IceStop is designed to remove
melt water, not accumulated snow.
8. Engineering
Specifications
•
ROOF AND GUTTER DE-ICING
If your application conditions are different, or if you have any questions, contact your Tyco
Thermal Controls representative, or contact Tyco Thermal Controls directly at (800) 545-6258.
How to Use this Guide
This design guide presents Tyco Thermal Controls’ 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, energy-efficient 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 Tyco Thermal Controls
web site at www.tycothermal.com.
For products and applications not covered by this design guide, please contact your Tyco
Thermal Controls representative or call Tyco Thermal Controls directly at (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 Tyco
Thermal Controls, 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
Tyco Thermal Controls’ standard limited warranty applies to all products.
An extension of the limited warranty period to ten (10) years from the date of installation is
available 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 website at
www.tycothermal.com.
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System Overview
3. Surface Snow
Melting and
Anti-Icing–MI
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
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
•
2. Roof and Gutter
De-Icing
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.
1. Pipe Freeze
Protection and
Flow Maintenance
System Overview
Heating Cable
5. Freezer Frost Heave
Prevention
Power Distribution Panel
6. Floor Heating
Snow Controller
7. Technical Data
Sheets
AP
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8. Engineering
Specifications
9. Index
Fig. 1 Typical IceStop roof and gutter de-icing system
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ROOF AND GUTTER DE-ICING
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.
Temperature
Power
ula
t
ing
Constant wattage
Se
Resistance
At moderate temperature,
there are fewer conducting
paths because the heating
cable efficiently adjusts by
decreasing output, eliminating
any possibility of overheating.
lfre
g
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.
Constant wattage
Se
lf-r
eg
ula
tin
g
Temperature
Fig. 3 Self-regulating heating cable technology
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Approvals
Design Step by Step
 Determine design conditions
 Select the heating cable
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
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‚” page 33, 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.
3. Surface Snow
Melting and
Anti-Icing–MI
Roof and Gutter De-Icing Design
2. Roof and Gutter
De-Icing
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.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
5. Freezer Frost Heave
Prevention
 Determine the heating cable length
 Determine the electrical parameters
 Select the connection kits
 Select attachment accessories and method
6. Floor Heating
 Select the control system and power distribution
 Complete the Bill of Materials
7. Technical Data
Sheets
8. Engineering
Specifications
9. Index
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ROOF AND GUTTER DE-ICING
Roof and Gutter
De-Icing
1. Determine design
conditions
2. Select the heating
cable
Step Determine design conditions
Collect the following information to determine your design conditions:
•
Type of roof
•
Layout
– Roof edge
3. Determine the
heating cable length
– Eave overhang
4. Determine the
electrical parameters
– Gutters
5. Select the
connection kits
6. Select attachment
accessories and
method
Length
-
Depth
-
Width
– Roof valley
7. Select the control
system and power
distribution
8. Complete the Bill of
Materials
-
– 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 of 38
Roof edge
60 ft (18.3 m) x 2 roof edges = 120 ft (36.6 m)
Eave overhang
24 inch (60 cm)
Gutters
2 gutters
Length
60 ft (18.3 m) x 2 gutters = 120 ft (36.6 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
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Roof and Gutter
De-Icing
2. Select the heating
cable
3. Determine the
heating cable length
5. Select the
connection kits
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
GM — 1 or 2
-X or -XT
Product family
Voltage
1 = 120 V
2 = 208–277 V
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
8. Complete the Bill of
Materials
Catalog number:
3. Surface Snow
Melting and
Anti-Icing–MI
4. Determine the
electrical parameters
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.
2. Roof and Gutter
De-Icing
1. Determine design
conditions
Step Select the heating cable
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
Jacket type: Polyolefin
or
Fluoropolymer
Fig. 4 Heating cable catalog number
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
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 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.
Supply voltage
208 V (from Step 1)
Catalog number
GM-2XT
8. Engineering
Specifications
Example: Roof and Gutter De-Icing System
7. Technical Data
Sheets
SELECT OUTER JACKET
6. Floor Heating
Use the following table to evaluate heating cable specifications that describe some important
aspects of the heating cable.
5. Freezer Frost Heave
Prevention
SELECT HEATING CABLE SUPPLY VOLTAGE
9. Index
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ROOF AND GUTTER DE-ICING
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 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 Tyco
Thermal Controls 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
Roof type
Page
Sloped roof – standard
9
Sloped roof – standing seam
9
Flat roof
11
Sloped roof without gutters
12
Roof features
Roof valley
13
Roof/wall intersections
13
Gutters
14
Downspouts
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 Tyco Thermal Controls for assistance.
Figure 5 and Figure 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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SLOPED ROOF — STANDARD
2. Roof and Gutter
De-Icing
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 Figure 7 and follow the
appropriate attachment recommendations in “Step  Select attachment accessories and
method‚” page 20. Additional heating cable may be needed for other gutters, downspouts,
and valleys.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
3. Surface Snow
Melting and
Anti-Icing–MI
m)
Fig. 7 Layout in a zig-zag pattern
Install the heating cable on the roof in a zig-zag pattern as shown in Figure 7.
•
Run heating cable up the roof until it is 12 inches (30 cm) past the exterior wall into the
heated area (see Figure 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
Meters of heating
cable per meter of
roof edge
Tracing height
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 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.
Additional heating cable must be run along the bottom of the gutter. See “Gutters‚” page 14.
Note: Attachment methods are not shown in Figure 7. For attachment methods, proceed to “Step  Select attachment accessories and method‚” page 20.
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
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9. Index
SLOPED ROOF — STANDING SEAM
8. Engineering
Specifications
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.
7. Technical Data
Sheets
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 Figure 10 on page 12.
6. Floor Heating
Feet of heating
cable per foot of
roof edge
Eave overhang
distance
Tracing width
5. Freezer Frost Heave
Prevention
•
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
0c
6
2' (
ROOF AND GUTTER DE-ICING
in Figure 8 and follow the attachment recommendations in “Step  Select attachment accessories and method‚” page 20. 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 (Figure 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, Figure 6 on page 8.
•
If the roofing materials continue down the fascia, contact your local Tyco Thermal Controls representative or Tyco Thermal Controls directly for design assistance.
•
If there are no gutters, refer to “Heated Drip Edges‚” page 25, for information on how to
install heating cable for this application.
Table 4 IceStop Heating Cable Length for Sloped Roof – Standing Seam
Meters of
heating cable
per meter of
roof edge
Eave overhang
distance
Standing seam
spacing
Tracing height
Feet of heating
cable per foot of
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
Figure 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 Figure 8. For attachment methods, proceed to “Step  Select attachment accessories and method‚” page 20.
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FLAT ROOF
3. Surface Snow
Melting and
Anti-Icing–MI
Slope
Drain
Junction
box
5. Freezer Frost Heave
Prevention
Drip loop
Heating cable provides a
continuous heated path to
allow melt water to run off
the roof before it refreezes.
6. Floor Heating
Scupper
Ice can form around
drain and at roof edges
where adjacent snow
thaws during the day
and refreezes at night.
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
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
end seal
2. Roof and Gutter
De-Icing
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 Figure 9
and follow the appropriate attachment recommendations in “Step  Select attachment
accessories and method‚” page 20. Additional heating cable may be needed for downspouts.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
7. Technical Data
Sheets
Fig. 9 Layout on a flat roof
•
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 Figure 17 on page 15).
•
To avoid damage, do not walk on the heating cable.
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9. Index
2/09
Place heating cable around perimeter.
8. Engineering
Specifications
H56070
•
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ROOF AND GUTTER DE-ICING
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 Figure 10 or Figure 11 below and follow the
appropriate attachment recommendations in “Step  Determine the electrical parameters‚”
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  Select attachment accessories and method‚” page 20.
OTHER CONSIDERATIONS
12 of 38
•
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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ROOF VALLEYS
2. Roof and Gutter
De-Icing
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
Figure 12 and follow the appropriate attachment recommendations in “Step  Select attachment accessories and method‚” page 20. Additional heating cable may be needed for the roof
surface, gutters, and downspouts.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
1/3
3. Surface Snow
Melting and
Anti-Icing–MI
2/3
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  Select attachment accessories and
method‚” page 20.
ROOF/WALL INTERSECTIONS
6. Floor Heating
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.
5. Freezer Frost Heave
Prevention
•
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
Fig. 12 Layout for a roof valley
1/3
7. Technical Data
Sheets
2/3
8. Engineering
Specifications
2"–3"
4"–6"
Fig. 13 Layout for a roof/wall intersection.
2/09
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.
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9. Index
H56070
•
ROOF AND GUTTER DE-ICING
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 Figure 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 Figure 15
below and follow the appropriate attachment recommendations in “Step  Select attachment accessories and method‚” page 20. 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
14 of 38
•
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.
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DOWNSPOUTS
2. Roof and Gutter
De-Icing
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 Figure 16 and Figure 17 below. Follow the appropriate attachment
recommendations in “Step  Select attachment accessories and method‚” page 20. Additional heating cable may be needed for the roof surface, gutters, and valleys.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
3. Surface Snow
Melting and
Anti-Icing–MI
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
Fig. 16 Heating cable at top of downspout
Accumulated ice
can be removed.
Accumulated ice
may block drains.
Fig. 17 Heating cable at bottom of downspout
•
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.
8. Engineering
Specifications
If the downspout ends underground, the heating cable should extend into a heated area
or below the frost line.
7. Technical Data
Sheets
•
6. Floor Heating
Drain removes melt water
below the frost line.
5. Freezer Frost Heave
Prevention
12"
9. Index
H56070
2/09
(800) 545-6258
www.tycothermal.com
15 of 38
ROOF AND GUTTER DE-ICING
Example: Roof and Gutter De-Icing System
Type of roof
Sloped roof – standard with wood shingles and gutters
(from Step 1)
Layout
Roof edge
120 ft (36.6 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
120 ft (36.6 m) (from Step 1)
= 120 ft (36.6 m) heating cable
Depth
6 in (11cm) x 2 (from Step 1)
= 1 foot of additional heating cable 4.2 ft + 1 ft = 5.2 ft x 120 ft
= 624 ft (190.6 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 797 ft (243.5 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 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. The 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 of 38
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Select the smallest appropriate circuit breaker size.
Heating cable
GM-1X and -1XT at 120 V
GM-2X and -2XT at 240 V
GM-2X and -2XT at 277 V
(0°C)
100
(30)
20°F (–7°C)
95
0°F (–18°C)
80
190
32°F
(0°C)
20 A
30 A
40 A 1
—
A/ft
Max.
(A/m)
135
(41)
200
(61)
0.120 (0.394)
(29)
125
(38)
185
(56)
200
(61)
0.126 (0.414)
(24)
100
(30)
155
(47)
200
(61)
0.150 (0.492)
(58)
250
(76)
380 (116)
—
0.063 (0.207)
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
380 (116)
0.083 (0.272)
32°F
(88)
(0°C)
200
(61)
265
(81)
400 (122)
—
0.060 (0.197)
20°F (–7°C)
190
(58)
250
(76)
370 (113)
400 (122)
0.063 (0.207)
0°F (–18°C)
400 (122)
0.077 (0.253)
155
(47)
205
(62)
305
(0°C)
215
(66)
290
(88)
415 (126)
—
0.056 (0.184)
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)
32°F
(93)
Only FTC-P power connection, FTC-HST splice/tee, and RayClic-E end kits may be used with 40-A circuits.
Example: Roof and Gutter De-Icing System
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)
6. Floor Heating
Startup temperature
5. Freezer Frost Heave
Prevention
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 Tyco
Thermal Controls, 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.
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
1
32°F
Circuit breaker size
15 A
3. Surface Snow
Melting and
Anti-Icing–MI
GM-2X and -2XT at 208 V
Start-up
temperature
2. Roof and Gutter
De-Icing
Table 5 Maximum Circuit Length in Feet (Meters)
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
DETERMINE NUMBER OF CIRCUITS
Use the following formula to determine number of circuits for the system:
Number of circuits = Heating cable length required
7. Technical Data
Sheets
Maximum heating cable circuit length
Example: Roof and Gutter De-Icing System
Total heating cable length
797 ft (243.5 m) (from Step 3)
Maximum circuit length
355 ft (108 m) (from above)
Number of circuits
797 ft / 355 ft = 2.2 rounded to 2 circuits
The total transformer load is the sum of load on all the circuit breakers in the system.
Calculate the Circuit Breaker Load (CBL) as:
8. Engineering
Specifications
DETERMINE TRANSFORMER LOAD
Circuit breaker rating (A) x 0.8 x Supply voltage
CBL (kW) =
___________________________________________________
1000
9. Index
H56070
2/09
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17 of 38
ROOF AND GUTTER DE-ICING
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
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 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  Select attachment accessories and method‚”
page 20.
1. Determine design
conditions
2. Select the heating
cable
3. Determine the
heating cable length
4. Determine the
electrical parameters
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, Tyco Thermal Controls 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.
5. Select the
connection kits
6. Select attachment
accessories and
method
7. Select the control
system and power
distribution
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 heatshrinkable 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.
8. Complete the Bill of
Materials
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.
18 of 38
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Table 6 Connection Kits (Continued)
Heating cable
allowance 1
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)
RayClic-SB-02
Wall mounting bracket
1
Required for every
RayClic connection kit
5. Freezer Frost Heave
Prevention
Usage
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
Standard
packaging
3. Surface Snow
Melting and
Anti-Icing–MI
Description
2. Roof and Gutter
De-Icing
Catalog
number
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
Accessories
–
6. Floor Heating
1
Additional heating cable required for connection kit assembly and drip loops.
Junction box not included.
3
One RayClic-E end seal is required for each FTC-HST used as a tee kit.
2
Example: Roof and Gutter De-Icing System
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
7. Technical Data
Sheets
Connection kit
Determine how much additional heating cable you need for the connection kits.
Sloped roof – standard
624 ft (190.6 m)
Gutters
120 ft (36.6 m)
Roof valley
27 ft (8.3 m)
Downspouts
26 ft (8.0 m)
8. Engineering
Specifications
Example: Roof and Gutter De-Icing System
Total heating cable allowance for connection kits 12 ft (4.0 m)
H56070
2/09
(800) 545-6258
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809 ft (247.5 m)
9. Index
Total heating cable length required
19 of 38
ROOF AND GUTTER DE-ICING
Roof and Gutter
De-Icing
Step 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, 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
Usage
1 box per 35' of roof
edge when zig-zag
layout is used.
Heating cable
allowance
–
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
20 of 38
UV-resistant cable tie
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100/box
(800) 545-6258
As required.
–
H56070
2/09
Heating cable attachment depends primarily upon the roof type. The following table shows
the recommended attachment methods for typical roof materials and roof areas.
Roof material
Recommended
attachment method
Shake/shingle
Mechanical Attachment, page 22
Alternate attachment method
Belt Loop Approach, page 23
Adhesive Attachment, page 22
Metal
Mechanical Attachment,
page 22
Adhesive Attachment,
page 22
Belt Loop Approach page 23
Mechanical Attachment, page 22
Other
Attachment Methods for Other
Areas, page 24
Area
Attachment method
Gutters
Recommend using hanger clips
glued to gutter for security if possible (see page 24)
Downspouts
Downspout hangers (page 24)
Drip edges
Attached to a flat sheet or standard
drip edge, or installed informed
sheet metal (see page 25)
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 Tyco Thermal Controls representative.
Table 9 Adhesives
Color
Approximate
tooling time
Dispensing
Cure time 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.
8. Engineering
Specifications
Description
7. Technical Data
Sheets
Adhesive
6. Floor Heating
Adhesive is not supplied by Tyco Thermal Controls. Follow manufacturer’s instructions for
surface preparation and installation.
5. Freezer Frost Heave
Prevention
Component locations
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
Wood
3. Surface Snow
Melting and
Anti-Icing–MI
Rubber/membrane
2. Roof and Gutter
De-Icing
Table 8 Attachment Methods for Typical Roofs
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
9. Index
H56070
2/09
(800) 545-6258
www.tycothermal.com
21 of 38
ROOF AND GUTTER DE-ICING
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 30 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
22 of 38
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1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
2. Roof and Gutter
De-Icing
3. Surface Snow
Melting and
Anti-Icing–MI
Fig. 20 GMK-RC clip on flat roof
•
Several different adhesives are recommended by Tyco Thermal Controls. See Table 9 on
page 21 or contact Tyco Thermal Controls 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.
Heating
cable
7. Technical Data
Sheets
Roof
adhesive
6. Floor Heating
Strip of roof
material
5. Freezer Frost Heave
Prevention
The GMK-RC roof clips are used to secure IceStop heating cable. The clip attaches with
adhesive (not supplied by Tyco Thermal Controls) to many types of roofs and gutters.
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
•
Cable tie
Fig. 21 Belt loop approach on a sloped roof
8. Engineering
Specifications
9. Index
Fig. 22 Belt loop approach on a flat roof
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ROOF AND GUTTER DE-ICING
•
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 Tyco Thermal Controls. See Table 9 on page 21.
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
•
24 of 38
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.
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H56070
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Heated Drip Edges
2. Roof and Gutter
De-Icing
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.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
Roofing material
3. Surface Snow
Melting and
Anti-Icing–MI
Metal drip edge
IceStop heating cable
UV-resistant cable tie
Attached to flat sheet
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
UV-resistant cable tie
Attached to standard drip edge
2 3/4" (7 cm)
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. Tyco Thermal Controls does not manufacture drip edge attachment clips.
•
Use 20-gauge or thicker corrosion-resistant sheet metal.
•
Contact your Tyco Thermal Controls representative or Tyco Thermal Controls directly for
specific recommendations.
Example: Roof and Gutter De-Icing System
6. Floor Heating
•
5. Freezer Frost Heave
Prevention
1/4" (0.6 cm) Installed in a formed sheet
120 ft (36.6 m) roof edge and 2 gutters
4 boxes of 50
GM-RAKE
2
7. Technical Data
Sheets
GMK-RC
8. Engineering
Specifications
9. Index
H56070
2/09
(800) 545-6258
www.tycothermal.com
25 of 38
ROOF AND GUTTER DE-ICING
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 Select the control system and power distribution
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 Tyco Thermal Controls 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 Thermostats
26 of 38
AMC-F5
AMC-1A
EC-TS-AMB
Type of sensing
Ambient
Ambient
Ambient
Sensor
Bulb and 3-ft capillary Probe
Thermistor
Set point range
40°F (4.4°C) fixed
15°F to 140°F
(–9°C to 60°C)
30°F to 110°F
(–1°C to 43°C)
Enclosure
NEMA 4X
NEMA 4X
NEMA 4X
Differential
6°F (–14°C)
6°F (–14°C)
3°F (1.7°C)
Set point repeatability
3°F (–16°C)
3°F (–16°C)
3°F (1.7°C)
Enclosure limits
–30°F (–34°C) to
140°F (60°C)
–40°F to 160°F
(–40°C to 71°C)
–40°F to 140°F
(–40°C to 60°C)
Electrical rating
22 A, 120 to 480 V
22 A, 120 to 480 V
30 A, 100 to 277 V
Approvals
UL Listed,
CSA Certified
UL Listed,
CSA Certified
UL Listed,
c-UL-us Listed
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H56070
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Automatic Moisture/Temperature Controller
3. Surface Snow
Melting and
Anti-Icing–MI
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.
2. Roof and Gutter
De-Icing
The most conservative approach from an energy-consumption point of view is an automatic
moisture/temperature sensor. Tyco Thermal Controls 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.
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
Table 11 Automatic Controllers
Application
SC-40C
GIT-3
GIT-4
Gutter de-icing
controller
Gutter de-icing
controller with
ground-fault protection
Number of sensors
1 to 6
1 to 6
1 to 6
1
1
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
32°C) adjustable
40°F to 90°F (4°C to
32°C) adjustable
40°F to 90°F (4°C to
32°C) adjustable
NA
NA
NEMA 3R
NEMA 3R
NEMA 3R
NEMA 3R
NEMA 3R
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)
–40°F to 160°F
(–40°C to 71°C)
–40°F to 160°F
(–40°C to 71°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
26 A, 120 V
26 A, 208-240 V
26 A, 277 V
26 A, 120 V
26 A, 208-240 V
26 A, 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
6. Floor Heating
Enclosure
5. Freezer Frost Heave
Prevention
APS-4C
Snow controller with Satellite contactor
ground-fault protection
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
APS-3C
Snow controller
Table 12 Moisture/Temperature Sensors
Set point
GIT-1
CIT-1
Gutter-mounted
moisture/temperature
Aerial-mounted
moisture/temperature
38°F (3°C)
38°F (3°C)
7. Technical Data
Sheets
Application
8. Engineering
Specifications
9. Index
H56070
2/09
(800) 545-6258
www.tycothermal.com
27 of 38
ROOF AND GUTTER DE-ICING
Table 13 Control Systems
Catalog number
Description
AMC-F5
Ambient or line-sensing thermostat designed to control heat-tracing systems used for freeze
protection in nonhazardous locations. The thermostat has a fixed set point of 40°F (5°C). It can be
used to control a single heat-tracing circuit or as a pilot control of a contactor switching multiple
heat-tracing circuits.
AMC-1A
Ambient-sensing thermostat designed to control heat-tracing systems used for freeze protection
in nonhazardous locations. The thermostat responds to ambient temperature changes and has an
adjustable set point. The AMC-1A can be used to control a single heat-tracing circuit or as a pilot
control of a contactor switching multiple heat-tracing circuits.
Mechanical Thermostats
Electronic Thermostats and Accessories
EC-TS-AMB
Electronic thermostat for snow melting applications housed in a NEMA 4X enclosure with
2 x 1/2 in conduit entries for power and 1 gland entry for the sensor. The temperature set point
and LED indicators for alarm, power, and heating cable status can be visually checked through the
clear lid. Electrical rating is 30 A at 100–277 V, 50–60 Hz, SPST switch. EC-TS-10 includes a 10 ft
(3 m) sensor. The EC-TS-25 includes a 25 ft (7.6 m) sensor. EC-TS-AMB includes an ambient
sensor.
APS-3C
Automatic snow melting controller housed in a NEMA 3R enclosure provides effective, economical automatic control of all snow melting applications. Features include: 120 V or 208–240 V
models, 24-A DPDT output relay and an adjustable hold-on timer.
Snow Melting Controllers
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 operates up to ten 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 groundfault 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)
28 of 38
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H56070
2/09
Table 13 Control Systems (Continued)
Description
GIT-3A
Gutter de-icing controller with ground-fault sensor consists of a gutter-mounted computerized
sensor and a controller in a NEMA 3R enclosure connected by a 12 ft 6 in (3.8 m) cable. Features
include: 120, 208–240 or 277 V single-phase operating voltage and a SPST 26-A contactor.
2. Roof and Gutter
De-Icing
Catalog number
Gutter De-Icing Controllers
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
Enclosure dimensions: 6 in x 6 in x 4.4 in (152 mm x 152 mm x 112 mm)
Sensor dimensions: 5.6 in x 1.5 in (141 mm x 38 mm)
Enclosure dimensions: 6 in x 6 in x 4.4 in (152 mm x 152 mm x 112 mm)
Sensor dimensions: 5.6 in x 1.5 in (141 mm x 38 mm)
Snow Melting and Gutter De-Icing Sensors and Accessories
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.
7. Technical Data
Sheets
GIT-1
6. Floor Heating
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.
5. Freezer Frost Heave
Prevention
CIT-1
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
Gutter de-icing controller with ground-fault sensor consists of a gutter-mounted computerized
sensor and a control enclosure connected by a 12 ft 6 in (3.8 m) cable. Features include: Remote
Control Unit (RCU-2),120, 208–240 or 277 V single-phase operating voltage, a SPST 26-A contactor and an integral 30 mA ground-fault equipment
protection.
3. Surface Snow
Melting and
Anti-Icing–MI
GIT-4
Example: Roof and Gutter De-Icing System
APS-4C
1
SC-40C
1
GIT-1
2 (one for each gutter section)
CIT-1
1
8. Engineering
Specifications
208 V system with 2 circuits
9. Index
H56070
2/09
(800) 545-6258
www.tycothermal.com
29 of 38
ROOF AND GUTTER DE-ICING
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 or HTPG
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 Figure 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 ambient-sensing thermostat, individual electronic, or duty cycle
controller.
Table 14 Power Distribution Panels
Application
30 of 38
SMPG1
HTPG
Control panel
Control panel
Controller
EUR-5A included
APS-3C required for control
Number of sensors
1 to 8
see APS-3C
Enclosure
NEMA 1, NEMA 3R
NEMA 12,NEMA 4 and
NEMA 4X
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)
Without space heater
32°F to 122°F (0°C to 50°C)
With a space heater
–40°F to 122°F (–40°C to 50°C)
Supply voltage
208 V, 277 V
120 V, 208 V, 240 V, 277 V
Circuit breaker rating
20 A, 30 A, 40 A, 50 A
20 A, 30 A, 40 A, 50 A
Approvals
c-UL-us
ETL, c-ETL
Ground-fault protection
Yes
Yes
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(800) 545-6258
H56070
2/09
Single circuit control
1. Pipe Freeze
Protection and
Flow Maintenance
Roof and Gutter De-Icing Design
Group control
2. Roof and Gutter
De-Icing
Temperature
controller
ø
ø
Heating
cable
1 ø supply
N
Temperature
controller
1-pole
GFEP breaker
1
C
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
3. Surface Snow
Melting and
Anti-Icing–MI
1-pole
GFEP breaker
ø supply
N
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
G (Typ 3)
Heating cable
sheath, braid
or ground
Fig. 26 Single circuit and group control
Main circuit breaker
(optional)
Fuse
Control transformer
G
N
EUR-5A SNOW SWITCH
4
AUTOMATIC SNOW/ICE MELTING CONTROL PANEL
24 V
3-phase 4-wire
supply (WYE)
6
2
SNOW/ICE
8
10
0
SUPPLY
HOURS
HEATER
CYCLE
6. Floor Heating
GIT-1
Ø1
Ø2
Ø3
CIT-1
HEATER
TEMPERATURE
Three-pole
main contactor
Remote annunciation alarm
(circuit breaker
with alarm type #3)
7. Technical Data
Sheets
One-pole with 30 mA
ground-fault trip (277 V)
5. Freezer Frost Heave
Prevention
Aerial snow sensor
Gutter ice sensor
High
temperature
sensor
Heating cable
sheath, braid
or ground
Single Ø
connection
8. Engineering
Specifications
Fig. 27 Typical wiring diagram of group control with SMPG1
9. Index
H56070
2/09
(800) 545-6258
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31 of 38
ROOF AND GUTTER DE-ICING
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.
HTPG
Heat-tracing power distribution panel with ground-fault and monitoring for group control.
COMMON ALARM
PUSH TO ACKNOWLEDGE
A
POWER ON
C
HAND/OFF/AUTO
Contactors & Junction Boxes
E104
Three-pole, 100 A per pole, 600 V maximum contactor housed in UL Listed, CSA Certified, NEMA
4X enclosure with two 1-inch conduit entries. When ordering, select coil voltage
(110–120, 208–240, 277 V).
Enclosure dimensions: 13-1/2 in x 9-1/5 in x 6-11/16 in (343 mm x 234 mm x 170 mm).
E304
Three-pole, 40 A per pole, 600 V maximum contactor housed in UL Listed, CSA Certified NEMA
4X enclosure with two 1-inch conduit entries. When ordering, select coil voltage
(110–120, 208–240, 277 V).
Enclosure dimensions: 9-1/2 in x 7-1/5 in x 6-11/16 in (241 mm x 183 mm x 170 mm).
Roof and Gutter
De-Icing
1. Determine design
conditions
Step Complete the Bill of Materials
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
32 of 38
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H56070
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IceStop System Roof and Gutter De-Icing Design Worksheet
Supply
voltage
Type of roof
Layout
 Sloped roof – standard
Roof edge
Min. start-up
temperature
Control method
 120 V
Length of roof edge (ft/m)
__________
 Flat roof
Number of edges
__________
 208–277 V
 Manual on/off control
______ (°F/°C)
 Ambient thermostat
 Automatic controller
Eave overhang
Roof material
Distance of overhang (in/cm) _________
 Shake/shingle
Gutters
 Rubber membrane
 Metal
 Wood
__________
Number of gutters
__________
Depth of gutters (in/cm)
__________
Width of gutters (in/cm)
__________
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
 Other: __________________
Length of gutters (ft/m)
Roof valley
Height of roof valley (ft/m) __________
Number of roof valleys
__________
Roof/wall intersection
Height of intersection (ft/m) __________
Number of intersections
__________
5. Freezer Frost Heave
Prevention
Downspouts
Downspout height (ft/m)
__________
Number of downspouts
__________
Example
9 Sloped roof – standard with wood shingles and gutters
60 ft
Roof edge:
2
x
=
120 ft
Total length of roof edges
Eave overhang: 24 in
60 ft
Gutters:
2
x
Length of gutter
=
Number of gutters
120 ft
Total length of gutters
6. Floor Heating
Number of edges
Length of roof edge
3. Surface Snow
Melting and
Anti-Icing–MI
 Sloped roof – standing seam
2. Roof and Gutter
De-Icing
Step  Determine design conditions
1. Pipe Freeze
Protection and
Flow Maintenance
IceStop System Roof and Gutter De-Icing Design Worksheet
6 in
7. Technical Data
Sheets
Depth of gutter
4 in
Width of gutter
Roof valley:
20 ft
1
Height of roof valley
Number of roof valleys
12 ft
Downspout height
x
2
=
Number of downspouts
24 ft
Total downspout height
Supply voltage: 208 V
Minimum start-up temperature: 20°F
8. Engineering
Specifications
Downspouts:
Control method: Automatic controller
9. Index
H56070
2/09
(800) 545-6258
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33 of 38
ROOF AND GUTTER DE-ICING
Step  Select the heating cable
See Figure 4.
Product family
Use catalog number:
34 of 38
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
www.tycothermal.com
Outer jacket
Catalog number
XT
GM-2XT
Outer jacket
Catalog number
—
(800) 545-6258
H56070
2/09
Step  Determine the heating cable length
requires
Eave overhang (in/cm)
Heating cable per foot of roof edge (ft/m)
Sloped roof – standing seam
with
Roof edge (ft/m)
Eave overhang (in/cm)
requires
Heating cable per foot of roof edge (ft/m)
2. Roof and Gutter
De-Icing
Sloped roof – standard
with
Roof edge (ft/m)
1. Pipe Freeze
Protection and
Flow Maintenance
IceStop System Roof and Gutter De-Icing Design Worksheet
Flat roof
=
x
From perimeter to drains (ft/m)
Heating cable for flat roof (ft/m)
Into internal downspouts (ft/m)
Gutters
x
2
=
=
+
Additional heating cable (ft/m)
Gutter depth (ft/m)
Heating cable with gutter
depth allowance (ft/m)
Heating cable per foot
of roof edge (ft/m)
=
x
Heating cable with gutter depth allowance (ft/m)
Roof edge (ft/m)
Total heating cable for roof edge (ft/m)
Heating cable for gutters (ft/m)
Gutter width multiplier
No gutters – heated drip edge
x 1
Roof edge (ft/m)
=
Heating cable for heated drip edge (ft/m)
Roof valleys
x 1.33 x
=
Number of roof valleys
Height of roof valley (ft/m)
Heating cable for roof valleys (ft/m)
x 1.33
=
Number of intersections
Heating cable for
roof/wall intersections (ft/m)
Downspouts
x
x
=
Number of downspouts
Height of downspouts (ft/m)
Runs of heating cable per downspout
Heating cable per downspout (ft/m)
24 in
with
Feet of roof edge (ft/m)
6 in
x
Eave overhang (in/cm)
2
1 ft
=
Gutter depth (ft/m)
4.2 ft
+
=
5.2 ft
x
=
1
x
Height of downspouts (ft/m)
=
Number of roof valleys
x
2
120 ft *
Heating cable for gutters (ft/m)
1
x 1.33 x
Height of roof valley (ft/m)
12 ft
=
Gutter width multiplier
26.6 ft rounded to 27 ft *
Heating cable for roof valleys (ft/m)
1
x
Number of downspouts
=
Runs of heating cable per downspout
2
+
24 ft
Heating cable per downspouts (ft/m)
=
Drip loop allowance (1 ft with loopback)
26 ft *
Feet heating cable for downspouts
797 ft
* Total heating cable length
2/09
(800) 545-6258
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35 of 38
9. Index
=
H56070
8. Engineering
Specifications
20 ft
624 ft *
Total heating cable for roof edge (ft/m)
Heating cable with gutter
depth allowance (ft/m)
Gutter length (ft/m)
5.2 ft
Heating cable with gutter
depth allowance (ft/m)
Heating cable per foot
of roof edge (ft/m)
Additional heating cable (ft/m)
Roof edge (ft/m)
120 ft
Heating cable per foot of roof edge (ft/m)
7. Technical Data
Sheets
120 ft
4.2 ft
requires
6. Floor Heating
Total heating cable length
Example: Sloped roof – standard with eave overhang and gutters
5. Freezer Frost Heave
Prevention
Roof/wall intersection
Height of intersection (ft/m)
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
=
x
Gutter length (ft/m)
120 ft
3. Surface Snow
Melting and
Anti-Icing–MI
x
Roof perimeter (ft/m)
ROOF AND GUTTER DE-ICING
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
T 208 V
T 277 V
T 20 A
T 40 A
/
Total heating cable length required
Start-up temperature
Maximum circuit length
=
Maximum heating cable circuit length
Number of circuits
Determine transformer load
Calculate the circuit breaker load (CBL)
(
x
)
0.8 x
/ 1000
=
Supply voltage
Circuit breaker rating
Circuit breaker load (kW)
If the CBL is equal on all circuits, calculate the transformer load as:
x
=
Number of breakers
Circuit breaker load (kW)
Total transformer load (kW)
If the CBL is NOT equal on all circuits, calculate the transformer load as:
=
CBL1 + CBL2 + CBL3... + CBLN
Total transformer load (kW)
Example:
Determine the maximum circuit length and number of circuits
Total heating cable
length required
Supply voltage: T 120 V
T 240 V
797 ft of GM-2XT
Circuit breaker size: T 15 A
9 30 A
T
797 ft
T 20 A
T 40 A
355 ft
/
Total heating cable length required
9208 V
T
T 277 V
Start-up temperature
20°F
Maximum circuit length
355 ft
2.2 circuits, round up to 2
=
Maximum heating cable circuit length
Number of circuits
Determine transformer load
30 A
(
x
0.8
208 V
x
5 kW
Circuit breaker load (kW)
36 of 38
)
/ 1000
=
Supply voltage
Circuit breaker rating
x
Circuit breaker load (kW)
2
=
Number of breakers
www.tycothermal.com
4.99 kW rounded to 5 kW
10 kW
Total transformer load (kW)
(800) 545-6258
H56070
2/09
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
_____________
__________________
RayClic-SB-02
Wall mounting bracket
_____________
__________________
Total heating cable
allowance for connection kits
+
Total heating cable length
=
Total heating cable allowance for connection kits
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
Total heating cable
allowance for connection kits
797 ft
12 ft
+
Total heating cable length
=
Total heating cable allowance for connection kits
809 ft
See Table 7 Attachment Accessories, Table 8 Attachment Methods for Typical Roofs, and Table 9 Adhesives.
Adhesive is not supplied by Tyco Thermal Controls
Quantity
GMK-RC
Roof clips
____________
GMK-RAKE
Hanger bracket
____________
CT-CABLE-TIE
UV-resistant cable tie
____________
8. Engineering
Specifications
Description
7. Technical Data
Sheets
Total heating cable
length required
Step  Select attachment accessories and method
Attachment accessories
6. Floor Heating
12 ft
5. Freezer Frost Heave
Prevention
Total heating cable
length required
4. Surface Snow
Melting and
Anti-Icing–ElectroMelt
Description
3. Surface Snow
Melting and
Anti-Icing–MI
Connection kits and accessories
2. Roof and Gutter
De-Icing
Step  Select the connection kits (See Table 6)
1. Pipe Freeze
Protection and
Flow Maintenance
IceStop System Roof and Gutter De-Icing Design Worksheet
Example:
120 ft roof edge and 2 gutters
4 boxes of 50 (from Table 7)
9 GM-RAKE
2 (from Table 7)
H56070
2/09
(800) 545-6258
www.tycothermal.com
9. Index
9 GMK-RC
37 of 38
ROOF AND GUTTER DE-ICING
Step  Select the control system and power distribution
Control Systems
See Table 10 Thermostats, Table 11 Automatic Controllers, Table 12 Moisture/Temperature Sensors, Table 13 Control Systems.
Thermostats, controllers
and accessories
Description
Quantity
AMC-F5
Mechanical thermostat
____________
AMC-1A
Mechanical thermostat
____________
EC-TS-AMB
Electronic thermostat with ambient sensor
____________
APS-3C
Automatic snow melting controller
____________
APS-4C
Automatic snow melting controller
____________
SC-40C
Satellite contactor
____________
GIT-3A
Gutter de-icing controller
____________
GIT-4
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
____________
Example:
Supply voltage
208 V (from Step 1)
Controller(s)
9 APS-4C
1
9 SC-40C
1
9 GIT-1
2 (one for each gutter section)
9 CIT-1
1
Snow melting and gutter de-icing
sensors and accessories
Power distribution
See Table 14 Power Distribution Panels and Table 15 Power Distribution.
Power distribution and control panels
Description
Quantity
SMPG1
Single-phase power distribution panel
____________
HTPG
Heat-tracing power distribution panel for group control
____________
Contactors
Description
Quantity
E104
Three-pole, 100 A per pole contactor
____________
E304
Three-pole, 40 A per pole contactor
____________
Step  Complete the Bill of Materials
Use the information recorded in this worksheet to complete the Bill of Materials.
38 of 38
www.tycothermal.com
(800) 545-6258
H56070
2/09
Canada
Tyco Thermal Controls
250 West St.
Trenton, Ontario
Canada K8V 5S2
Tel: (800) 545-6258
Fax: (800) 527-5703
Europe, Middle East, Africa
Tyco Thermal Controls
Latin America
Tyco Thermal Controls
7433 Harwin Drive
Houston, TX 77036
United States
Tel: (713) 868-4800
Tel: (713) 735-8645
Fax: (713) 868-2333
North Asia
Tyco Thermal Controls
20F, Innovation Building,
1009 Yi Shan Rd,
Shanghai 200233,
P.R.China
Tel: 86-21-2412-1688
Fax: 86-21-5426-2937 / 5426-3167
Romeinse Straat 14
3001 Leuven
België / Belgique
Tel: (32) 16/213 511
Fax: (32) 16/213 603
Tyco and other trademarks are the property of Tyco Thermal Controls or its affiliates
Important: All information, including illustrations, is believed to be reliable. Users, however, should ­independently evaluate the
suitability of each product for their particular application. Tyco Thermal Controls makes no warranties as to the accuracy or
completeness of the information, and disclaims any liability regarding its use. Tyco Thermal Controls' only obligations are those
in the Tyco Thermal Controls Standard Terms and Conditions of Sale for this product, and in no case will Tyco Thermal Controls
or its distributors be liable for any incidental, indirect, or consequential damages arising from the sale, resale, use, or misuse of
the ­product. Specifications are subject to change without notice. In addition, Tyco Thermal Controls reserves the right to make
changes—without notification to Buyer—to processing or materials that do not affect compliance with any applicable specification.
© 2009 Tyco Thermal Controls LLC
Worldwide Headquarters
Tyco Thermal Controls
307 Constitution Drive
Menlo Park, CA 94025-1164
USA
Tel: (800) 545-6258
Tel: (650) 216-1526
Fax: (800) 527-5703
Fax: (650) 474-7711
[email protected]
www.tycothermal.com
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