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THERMAL MANAGEMENT SOLUTIONS

EN-RaychemWinterGardH900-IM-H53665      01/13

HEATING cAbLE DESIGN

Only WinterGard Wet H612 120-V and H622 240-V heating cables 

are suitable for use with the H900 power connection kit for roof 

and gutter de-icing applications.

1. calculate the heating cable length required.

Length = A + b + c + D + E + F + G

A  Roof edge length (ft) x feet of heating cable per foot of roof edge 

(From Table 5)

b  Roof edge length (ft) x 0.5*
c  Total gutter length (ft)
D  Total downspout length (ft) + 1 (ft)
E  1 ft for each power connection
F  2 ft for each splice connection
G  3 ft for each tee connection

= Total heating cable length (ft)

* Roof extension: This length allows the heating cable to extend into the gutter 

to provide a continuous drain path, or where no gutters are present, extends 

beyond the roof edge to form a drip loop.

Note: Pentair Thermal Management recommends a gutter and downspouts to 

provide a continuous path for melted water.

Table 5.  WinterGard Wet cable length for roof de-icing

Standing seam metal roof:

Eave overhang

Shingle roof

18 inch seam 24 inch seam

0

2.0 ft

2.5 ft

2.0 ft

12"

2.8 ft

2.8 ft

2.4 ft

24"

3.8 ft

3.6 ft

2.9 ft

36"

4.8 ft

4.3 ft

3.6 ft

Note: Pentair Thermal Management recommends a gutter and downspouts to 

provide a continuous path for melted water.

Important: For the Pentair Thermal Management warranty to be 

valid, you must comply with all the requirements outlined in these 

guidelines.

All design information provided here is based on a “standard” shake 

or shingle roof application. For any other application or method of 

installation, consult Pentair Thermal Management at (800) 545-6258.

HEATING cAbLE INSTALLATION

1. prepare for installation.

• Store the heating cable in a clean, dry place.
• Use only the following Pentair Thermal Management accessories to 

satisfy code and agency requirements:

- H900 WinterGard Plug-in Power Connection Kit (with end seal)
- H910 WinterGard Splice and Tee Kit (if splicing or teeing)
- H915 Downspout Hangers
- H913/H914 Roof Clips

• Carefully plan the routing of the heating cable for roof and gutter 

de-icing.

• Make certain gutters and downspouts are free of leaves and other 

debris.

2. cut the heating cable to length.

• Cut the heating cable to the length required. This can be done before or 

after it is installed. Leave a minimum of 1 foot extra heating cable for 

connection to power. For splice and tee connections leave a minimum 

of 1 foot for each  section of heating cable. WinterGard  heating cable 

can be cut to length without affecting its heat output per foot.

• Protect the heating cable ends from moisture and mechanical damage 

if they will be left exposed before connection.

3. position and attach the heating cable.

On roofs

• Loop the heating cable on the overhang area of the roof. This is the 

part that extends past the building wall. Extend the bottom of each 

heating cable loop over the roof edge and, using a UV-resistant cable 

tie, connect the bottom of each loop to the cable running in the gutter 

to ensure a drainage channel off the roof and into the gutter and 

downspout. The cable running in the gutter should remain against 

the bottom of the gutter. Extend the top of each heating cable loop 

beyond where the wall joins the roof. Pentair Thermal Management 

recommends 2-foot clip-spacing along the roof edge. See the “Heating 

cable design” section (Table 5) for spacing and layout information.

• Use WinterGard H913/H914 roof clips to attach heating cable to the 

roof surface. One kit contains ten double roof clips for approximately 

7 linear feet of roof edge. One H914 kit contains 50 roof clips for 

approximately 35 linear feet of roof edge.

  For flat roofs, the heating cable can be spaced as needed to create 

runoff paths for melting ice and snow. Use single-ended clips located 

at 3-foot intervals to secure the cable to the roof.

  Roof clips may be attached to a shake or shingle roof with nails or 

screws. Reseal the nail or screw holes if necessary before installing 

heating cable in the clips. Roof clips may be attached to a metal roof 

using screw, nail or adhesive. (See H56723 installation instruction for 

more details.)

• A barrier (snow fence) can be placed on the roof above the heating 

cable. This prevents damage to the cable and keeps the installation 

from coming loose due to ice slides. If desired, the heating cable can 

be attached to the barrier with UV-resistant cable ties, instead of 

using roof clips. Do not use wire or other materials because they may 

damage the heating cable.

In gutters and downspouts

• Run heating cable along gutters and into downspouts, ending below 

the freezing level. Permanent attachment of the cable to the gutter 

bottom is not necessary. Loop the heating cable in downspouts if 

convenient, such as when the downspout is not at the end of the run, 

or use the H910 splice and tee kit to tee down the downspout.

• Use WinterGard H915 downspout hangers to protect the heating cable 

from fraying and from damage from sharp edges and to provide strain 

relief. Refer to the H915 kit instructions for installation details.

• Use WinterGard H913/H914 roof clips to route heating cable into 

and out of the gutter in such a way as to prevent abrasion to the 

cable. Protect all cable that protrudes past the lower opening of the 

downspout. 

H900 DESIGN AND INSTALLATION INFORMATION FOR ROOF AND GUTTER DE-IcING ONLy 

(WinterGard Wet H612, and H622 Heating cables)

Example:

Roof edge: 

40 ft

Roof overhang: 

1 ft

Roof gutter: 

40 ft

Downspout: 

15 ft

Power connection: 

2 ea

Tee connection: 

1 ea

Voltage available: 

120 V

CB Size Available: 

15 A

Start-up temperature:  0 °F

WinterGard Wet heating cable required:

A  Roof edge:  

40 ft x 2.0 

 

(from Table 5)  = 80 ft

b  Roof extension:  

= 40 ft x 0.5  

= 20 ft

c  Roof gutter:  

= 40 ft

D  Downspout:  

= 15 ft + 1 ft  

= 16 ft

E  Power connection:  

1 ft x 2 ea  

= 2 ft

F  Splice Connections:  = 0

G  Tee connection:  

3 ft x 1 ea  

= 3 ft

Total WinterGard Wet heating cable
required: 

= 161 ft**

** This total exceeds 100-ft maximum circuit length (see 

Table 6), therefore two separate circuits are required.

Summary of Contents for Raychem H900

Page 1: ...ng cable branch circuit Arcing may not be stopped by conventional circuit protection Component approvals and performance are based on the use of specified parts only Do not substitute parts or use vinyl electrical tape The black heating cable core is conductive and can short It must be properly insulated and kept dry Keep components and heating cable ends dry before and during installation Damaged...

Page 2: ...iple trace the pipe using three straight traces at the 11 o clock or 1 o clock position and at the 4 o clock and 8 o clock positions Example 1 Pipe size 1 in Lowest air temp 0 F Insulation thickness 1 2 in Metal pipe WinterGard H311 Plastic pipe WinterGard Plus H611 H621 WinterGard Wet H612 H622 Example 2 Pipe size 2 1 2 in Lowest air temp 20 F Insulation thickness 1 2 in Metal pipe 1 3 WinterGard...

Page 3: ...ating cable can be cut to length without affecting its heat output per foot Protect the heating cable ends from moisture or mechanical damage if they will be left exposed before connection 3 Position and attach heating cable to pipe Be sure all piping to be traced is dry Install heating cable using straight tracing spiraling or multiple tracing according to the Heating cable selection and design s...

Page 4: ...t should be removed and replaced with new WinterGard heating cable WARNING Shock and Fire Hazard Damaged heating cable or components can cause electrical shock arcing and fire Do not attempt to energize damaged cable or components Replace them immediately using a new length of heating cable and the appropriate WinterGard accessories Electrical Protection Voltage rating H311 H611 and H612 110 120 V...

Page 5: ...tant cable tie connect the bottom of each loop to the cable running in the gutter to ensure a drainage channel off the roof and into the gutter and downspout The cable running in the gutter should remain against the bottom of the gutter Extend the top of each heating cable loop beyond where the wall joins the roof Pentair Thermal Management recommends 2 foot clip spacing along the roof edge See th...

Page 6: ... using only approved WinterGard H910 splice kits Do not repair the damaged heating cable section If physical damage cannot be found the complete circuit should be removed and replaced with new WinterGard heating cable WARNING Shock and Fire Hazard Damaged heating cable or components can cause electrical shock arcing and fire Do not attempt to energize damaged cable or components Replace them immed...

Page 7: ...r connection Note De icing and snow melting equipment label must be placed on junction box cover H913 H914 Roof clip H900 Power connection Note De icing and snow melting equipment label must be placed on junction box cove r End seal included in H900 and H910 kits Drip loops Roof without gutters or downspouts Roof with gutters and downspouts Note In all locations route and secure cable to avoid pos...

Page 8: ...outer jacket Cables with no outer jacket look slightly different from those illustrated Open sealing fitting and discard black grommet Slide parts onto cable as shown Push braid back to loosen slightly Gently spread apart braid as shown Bend heating cable and work it through the opening in the braid Lightly score completely around and then down outer jacket Bend heating cable to break jacket at sc...

Page 9: ...mediately pinch with pliers between wires while tube is still hot Hold for 10 seconds to ensure seal Trim braid Crimp ring terminal onto braid Discard black grommet supplied with sealing fitting Slide parts onto heating cable as shown Score between bus wires at base jacket Bend core to break free at base jacket Peel core and any remaining material from bus wires Slip green yellow tube over braid a...

Page 10: ...ed wires Apply Electric De icing label to junction box cover Note For WinterGard Wet cables follow instructions provided with junction box to seal against water if used in wet locations Insert heating cable and tighten fitting as shown Make connections as shown The wire nuts included are not intended for use with aluminum feed wires Note For junction box with clearance hole use lock nut Insert sea...

Page 11: ...avel and remove exposed braid Firmly push end seal onto the cable at least 1 1 2 inches Some gel may ooze out Do not twist or try to remove the end seal during or after insertion Do not reuse an end seal Firmly push end seal onto the cable at least 1 1 2 inches Some gel may ooze out Do not twist or try to remove the end seal during or after insertion Do not reuse an end seal Cleanly cut off the en...

Page 12: ...s of any kind whatsoever whether direct indirect incidental or consequential Notwithstanding the foregoing Pentair Thermal Management shall have no liability whatsoever unless a Buyer promptly notifies Pentair Thermal Management in writing after discovery of an alleged nonconformity and includes a detailed explanation of the alleged nonconformity b Buyer promptly returns the goods to Pentair Therm...

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