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Installation & Owner’s Guide QW-JOIST 8
Attach heating panel sets to joists
When using a floor sensing thermostat, the floor sensor must be installed correctly to control the floor temperature
appropriately. It is important to install the sensor where the panels are placed for optimal control. The following
are recommended options for installing the sensor. Other equivalent methods may be used.
Before installing the sensor, make sure to test it with an ohmmeter to ensure there are no factory defects, see the
installation instructions of the thermostat for proper installation guidelines.
Option 1. A sensor may be difficult to place within some existing floors, the sensor may be placed under the
subfloor. However, keep in mind that the temperature the sensor gives will not be a true floor surface temperature
and the floor-sensing control may need to be adjusted accordingly.
The most accurate method is to drill 3/4” to 1” long hole at an angle into the bottom of the subfloor (drilling at an
angle prevents puncturing through floor surface). Locate this hole in a joist bay directly over where a joist panel
will be installed, about 2” from the joist. Insert the sensor into the angled hole and seal it with adhesive. Insulate
the sensor with additional insulation. This will isolate the sensor from the heated joist space and give a more
accurate floor surface temperature.
Option 2. If it is not possible to drill a hole to set the sensor in the subfloor, it may be held flat to the subfloor with
a nylon wire clip. Locate the sensor in a joist bay directly over where a mat will be installed, about 2” from the
joist. Insulate the sensor with additional insulation, This will help isolate the sensor from the heated joist space.
Option 3. If possible, install the sensor directly into or under the floor covering area. For example, if the existing
floor covering is tile, an existing grout line can be removed and the sensor laid into this grout line. Place the
sensor at least 1 ft. from outside walls and near the center of a joist space. Complete the rest of the installation
before covering or regrouting over the sensor.
Subfloor
Floor
Hole drilled for Temp Sensor
Temp Sensor
Insulation (min. 3/4")
Subfloor
Floor
Temp Sensor
Insulation (min. 3/4")
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