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ManualsBrandsSuntouch ManualsElectric Radiant Heat50 Sq Ft. SlabHeat Cable (120V)
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F-ST-SlabHeat-Product-Information 1111 © 2011 Watts Radiant
I N T E R I O R S L A B H E A T I N G C A B L E
System Design
Expected floor temperature:
Please consult a designer or the factory if questions remain about the surface temperature that can be expected from the cables in
any particular construction.
STEP 1.3
Multiply the square footage measured in Step 1.1 by 0.90 to allow for 4" to 6" spacing around the edges of the floor area. Use this
resulting square footage to select the appropriate cables.
Remember:
If the exact size of product calculated is not found, adjust the warming area(s) or select the next smaller size.
Remember, the heating cable must never be cut shorter to fit, and must be completely embedded in
concrete in the floor. Failure to do so may result in damage to the product. Be careful not to select a
product which is too large.
STEP 1.4
If installing SlabHeat on top of an existing slab, select enough CableStrap
™
to secure the cable to the floor. One box contains 25 ft. of
strap, enough to prepare about 50 sq. ft. of floor at 4 ft. spacing. Strap is usually spaced every 3 to 4 ft. across the floor.
• Insulated concrete slab: With the cables installed on an insulated concrete slab, and finished floor installed, most floors can be
heated up to 15ºF (9ºC) warmer than they would otherwise be. Response time is greatly improved vs uninsulated slabs.
• Uninsulated concrete slabs: With the cables installed on an uninsulated concrete slab, and finished floor installed, most floors
can be heated up to 10º-15ºF (12º to 9ºC) warmer than they would otherwise be. Response time will lag compared to an
insulated slab.
• Do not place over 15 amps at 120 VAC (1800 watts) or 15 amps (3600 watts) at 240 VAC through a SunStat control.
• Select either 120 VAC or 240 VAC depending on the power available. DO NOT mix voltages on the same system if more than one
cable is to be installed to cover an area.
• Load no more than 12 amps (1440 watts) on a 15-amp circuit breaker, or 15 amps (1800 watts) on a 20-amp circuit breaker.
• If an area requires more than 15 amps of SlabHeat to be controlled by one SunStat, use SunStat Relay(s) to take the additional
amp load.
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