Brochure
5
4
5A
IMPORTANT: the sensor conduit must be centered in 
the cable loop (between two red heating wires).
Seal the end of the conduit that is placed in the floor with a 
piece of duct tape. This will prevent thinset from penetrating 
the conduit.
Use duct tape to hold the sensor conduit into the groove to 
prevent it from floating up when the mortar or  thinset  is 
poured.
If the sensor is installed directly in the mortar bed, use duct 
tape to secure to subfloor.
Clean and vacuum the floor thoroughly and remove dust 
and debris from the floor that may damage the heating 
cable or reduce adhesion.
Ensure that the subfloor is secure and stable.  Carefully fill 
in all cracks to prevent any potential damage to the new 
tiles resulting from shifts in the subfloor.
(Optional) To ensure maximum adhesion, apply a primer 
or sealer as recommended by the thinset or self-leveling 
cement manufacturer. If using a primer, ensure that the 
entire floor is covered. Allow the primer to dry thoroughly 
before proceeding to the next steps.
Step 4. PREPARE SUBFLOOR SURFACE
Use  a  digital  ohm  meter  to  measure  the  resistance  of 
the Danfoss LX mat and compare it to the resistance listed 
on the product label. The resistance should be measured 
between the  two  conductors,  blue and  black.  Compare 
the measured resistance to the resistance on the product 
label, located 3 inches from the splice, on the cold lead. 
Also, measure the resistance between the blue, black and 
shielding/ground wire. Both should read infinity. 
Record  the  measured  resistance  on  the  warranty 
card.  Documenting  the  resistance  at  each  stage  of 
installation  is  required  for  warranty  purposes. 
Step 5A.  MEASURE THE RESISTANCE
Copyright 2009 Danfoss Inc. 
TEL: 866-676-8062. FAX: 905-285-2055
088L3380 - 06/09










