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Snow Melting Cable Installation Instructions

Ashrae recommended loads
CLASS I-RESIDENTIAL WALKS & DRIVEWAYS  -36 WATTS SQ./FT.
CLASS 11-COMMERCIAL S1DEWALKS AND
DRIVEWAYS, HOSPITAL STEPS. -40 WATTS SQ./FT.
CLASS III-TOLL PLAZAS, BRIDGES. APRONS
AND AIRPORT -55 WATTS SQ./FT.

LAYING OF HEATING tubingS SIDEWALKS-DRIVEWAYS-ROADS
The heating cables must be evenly distributed. Please use the Factory designated spacing between the cables. This number is Found on the ul tag that is attached to each cable. always run the cable across the shortest dimension of the area. The base should be compacted and stones and other sharp Objects, which can damage the cables, should be cleared away Before lying of the cables. The level of base must be checked So that the thickness of the covering material is correct. The Covering must be a minimum of 2" but not more than 3" to Assure heat transfer to the surface. Any subsidence or Displacement of this base may cause damage to the heating Cables. It is important that the adjoining areas are properly Filled with frost proof stone, so that no difference in levels Occurs where the heated area meets the unheated area. Refer to detail 1 and 1a for applicable construction details.

Snow Melting PEX Heating

RAMPS-BRIDGES-ETC.
Structures of this kind usually consist of a structural concrete floor where the cables are covered with concrete or asphalt. The cables must not be laid across the expansion joints or pass directly from a firm concrete base to an earth base. SEE DETAIL 2.

Snow Melting PEX Heating

EXTERNAL STAIRS
The cables should be laid lengthwise on the steps so that they Only lie on the horizontal surfaces. detail 3 shows a section Of a stairway with heating cables laid directly on the Concrete. For installations of his klnd it is essential to have a Roughcast concrete step as a base. The cables should be first Covered with 2" of screed or paving slabs embedded in mortar. If the stairs are to be paved, the heating cables should be first Covered with a thin layer of mortar. If paving slabs are used, They should not project too far over the front edge of the Steps. Projections like this are greatly exposed to the cold, And ice can very easily form on the outer edge of the step Causing an un-safe condition. The first cable runs must Therefore be positioned as close as possible to the front edge Of the step.

Snow Melting PEX Heating

OPTIONAL INSTALLATION METHODS

for large areas or long narrow (tire tracks)
Cable shall be field assembled to 1 1/2" x 1 1/2" mesh standard safety netting, (see detail a.) by the use of plastic tie wraps to create a pre-assembled mat, the centers will be specified on the cable instructions.

When pouring a large area the pre-assembled mats shall be installed in a checkerboard pattern, so as to create areas for the contractor to properly handle the cable

Snow Melting PEX Heating

TESTING

Testing is very important.
Cables should be tested three times; first when they are Received, compare your ohm reading to the factory value, Which you will find on the ul tag. Cables testing should Test at 10% of the factory value. Second during the laying Of the cables an ohm meter should remain attached to Each cable. Third during the pour a meter should remain Attached to the cable to let you know if a problem is Occurring.

SPECIAL NOTES

1. If asphalt is to be used it should be as cool as possible, preferably laid below 275-300f and     be shoveled onto the surface then rolled.
2. The splice or portion of the tubing where it meets the lead wire is the fatter black      shrink wrap part and must be buried into the pour!
3. The lead wire is type uf and can be buried directly in the ground (lie it is run in the slab      that is being heated it must be run in conduit.
4. Nec regulations call for gel protection for each installation.

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