Danfoss TX-FH Heating Cables Installation Guide

Danfoss TX-FH Electric Floor Heating System

Danfoss TX-FH cables are a robust floor heating solution. Their thicker diameter compared to Danfoss LX heating cables results in lower cost, higher heat output, and increased durability. These cables are installed within mud beds beneath flooring materials, making them ideal for new construction projects where overall material cost is a key consideration.

Benefits of the TX-FH thermal storage system include:

• Easy and flexible installation with a single point connection.
• Extreme durability.
• Twin conductor cable design.
• Emits zero EMF (Electromagnetic fields).
• Safety approved for wet locations.
• Reduced dust and allergens.
• Silent, safe, and efficient operation.
• Reclaimed interior floor space (eliminates need for furnace/boiler).
• Genuine ten-year non-prorated warranty.

Caution!

This equipment must be installed only by qualified electricians who are familiar with the proper sizing, installation, construction, and operation of electric heating cable systems and the associated hazards. The heating cable is designed exclusively for under-floor heating purposes.

Danfoss TX-FH Cable Specifications

Note: TX-FH cables operated on a 208 V power supply will experience a 25 % power reduction.

Connection 240 V: Phase - Black, Phase - White, Ground - Green.

Certifications & Disposal: The product meets EU consumer safety, health, or environmental requirements (CE mark). It has been tested and meets applicable standards for safety and/or performance from ANSI, UL, CSA, and/or NSF (CSA mark). The product must be disposed of separately from household rubbish and recycled.

Measuring the Resistance

Warning! Remember to measure resistance.

Monitor your installation using the Little Buzzer continuity alarm (part # 088L0028).

Using a digital ohmmeter, measure the resistance between the black and white conductors. Compare the measured resistance to the value listed on the product label (on the power lead).

Additionally, measure the resistance between the black and green (ground) wires to test insulation resistance. Both should show infinite resistance. If available, Danfoss recommends using a mega-ohmmeter for this test, with a voltage setting up to 2500 V.

Record the resistance on your warranty card. Documenting resistance at each installation stage is crucial for warranty purposes. If measured resistances do not match expected values, the cable may be damaged and require repair. Contact your Danfoss representative for a repair kit (part # 088L0010).

While not mandatory, measuring the floor sensor's resistance is also recommended. It should be approximately 12 kΩ at room temperature.

General Notes

Read before beginning installation!

• Installation must comply with manufacturer's instructions and national/local electrical codes, including Part 424, ANSI/NFPA70, National Electrical Code (NEC), and Canadian Electrical Code, Part 1 (CEC).
• Always install GFCI protection for heating cables in normally wet areas (e.g., bathrooms, showers, kitchens).
• Adhere to all local codes concerning buildings and electrical installations. If local regulations conflict with these instructions, contact the Danfoss Electrical Heating Division.
• This equipment should only be installed by qualified electricians familiar with electric heating cable systems and their hazards.
• Verify that the supply voltage matches the voltage required for your Danfoss TX-FH product.
• Exercise extreme care to avoid damaging TX-FH cables with sharp tools or implements. Do not walk on the cables or mats during installation.
• Never cut the heating cable.
• Do not alter or repair the TX cable. Replace the TC cable if the heating cable or cold lead is accidentally damaged.
• Do not install Danfoss TX-FH cables in a manner where two cables touch, cross, or overlap.
• Measure, verify, and record the actual resistance at these stages: 1. Out of the box, 2. After installation, 3. After laying the mud bed, 4. After connecting the thermostat and/or contactors. Failure to record these values on the warranty card will void the warranty.
• The Danfoss TX-FH system is most effective with tiled, stone, or concrete floors. For carpet, wood, or other flooring materials, consult the Danfoss Electrical Heating Division.
• The TX-FH cable must be embedded in mortar, mortar mixture, concrete, or similar material.
• Ensure all sharp stones and debris are removed from the installation area.
• Prevent the cable from excessive tension or strain, especially at the power lead splice.
• At low temperatures, the cable stiffens. To ease handling, connect the cable to the mains briefly with the cable fully unrolled.
• Do not install TX-FH cable in walls or ceilings.
• Do not install heating cables under cabinets or kitchen islands.
• Never use the heating cables to cure tile adhesive products.
• For any questions or advice, please consult the Danfoss Electrical Heating Division.

General TX-FH Cable Installation Guidelines

Cable Strapping

For ease of installation, Danfoss cable strapping (part # 088L1051, # 088L1050) can be used for the TX-FH cable. Follow these steps:

1. Secure the Danfoss strapping to the ground surface, spaced approximately 3 ft (0.9 m) apart.
2. Place the TX-FH cable onto the strapping.
3. Clip the TX-FH cable securely in place.

Installing the heating cable

The TX-FH cable must be laid out with even spacing across the entire heated area. Using Danfoss cable strapping is recommended for accurate and easy installation. The strapping should be positioned perpendicular to the direction the cable is unrolled. Space the strapping 3 ft (90 cm) apart. Secure the heating cable to the strapping at the correct center-to-center distance, avoiding overtightening, which could damage the cable.

If wire mesh is available, strapping is not required. The heating cable can be attached directly to rebar or wire mesh using tie wraps, and grounded according to CSA standard C22.1, Section 10 and the National Electrical Code (NEC). The cable can also be secured with hot melt glue, duct tape, or 3/8" crown staples.

Danfoss TX-FH Typical Installations

Directly on plywood: The layers typically include Finished Flooring (tiles, marble, etc.), Sensor, Mud Bed, Heating Cable (max. 2" from surface), Subfloor, and optional Insulation.

Directly on concrete: The layers typically include Finished Flooring (tiles, marble, etc.), Mud Bed, Heating Cable (max. 2" from surface), Sensor, and optional Insulation.

Danfoss TX-FH Installation - Step by Step

Step 1: Plan your layout

Create a sketch of the area to be covered with TX-FH cables. Accurately measure the net floor area (the area to be walked upon). Do not install heating cable under permanent fixtures. Ensure the cable is separated from other heat sources like chimneys. Select cable spacing; never closer than 4" apart, with 6" recommended by Danfoss. Plan the locations for thermostats, floor sensors, and their conduits. The start of the cables should be positioned as close as possible to the thermostat's final placement. Refer to Appendix A for a layout example.

Step 2: Installing the floor sensor and conduit

A floor sensor should be installed in a rigid conduit. The conduit protects the sensor and facilitates its replacement if it fails. The sensor and conduit can be installed during construction and connected later. Ensure the conduit is sealed before concrete is poured and positioned between the heating cables. Place the sensor inside the tube until it reaches the end. The floor sensor should be installed at least 10 to 15 inches into the heated area. The sensor has a standard 10 ft (3 m) lead, which can be extended with 20 AWG wire.

Step 3: Measure the resistance of the heating cable

Using a digital ohmmeter, measure the resistance of the TX-FH cable. Compare the measured value with the resistance listed on the power lead label. Record these measured resistances on the warranty card, as this documentation is required for warranty purposes.

Step 4: Installing the TX-FH cable

Install the heating cable, potentially using cable strapping first. The power lead splice and at least 12 inches (30 cm) of the power lead must be embedded in the mass material. The remainder of the power lead should be routed through a conduit extending to the thermostat or contactor. The power lead may be extended if necessary. Measure the resistance again and record the information on the warranty card.

Tip: Danfoss recommends taking a picture of the cable layout and conduit placement during installation. This can be helpful if cables require repairs or for warranty claims.

Completing Installation

Step 5: Install the floor coverings

Apply the mortar bed. Ensure contractors are careful not to damage the cable with tools or heavy materials. After installing the tile, measure the resistance and record the information on the warranty card. It is advisable not to power the cables until the tile adhesive has cured (approximately 30 days). Consult the tile adhesive manufacturer for exact curing times, as powering too early can affect tile integrity and system operation.

Step 6: Connect power supply and thermostat

The TX-FH thermostat connection must be performed by a qualified electrician familiar with heating cables and adhering to the National Electrical Code (NEC) and Canadian Electrical Code, Part 1 (CEC). Ensure the heating cable braid is properly grounded. If not already done, install the sensor in its conduit, ensuring it reaches the sealed end. Connect the thermostat and sensor according to the wiring diagram in Appendix A. A final resistance reading of the cables should be taken and recorded on the warranty card.

Step 7: Record information and affix labels

• Ensure all measured resistances are recorded on the warranty card.
• Record the eight-digit product code from the TX-FH cable power lead on the warranty certificate.
• Install the electrical panel label at the electrical panel, indicating the cable's location.
• Install the Warning label in a visible area of the floor for the duration of construction. It is also recommended to keep this label in a suitable permanent location.

Step 8: Enjoy the comfort of Danfoss TX-FH

The TX-FH electric heating system is now ready for use. Increase the temperature gradually to achieve your desired comfort level.

Extended Warranty

For a period of twenty (20) years from the date of purchase, Danfoss warrants the Danfoss TX-FH cable against defects in material, design, and workmanship. The extended warranty is valid only if the warranty certificate is properly completed and mailed, and the installation adheres to the installation instructions.

Defective Danfoss TX-FH cables must be inspected or submitted to Danfoss or an authorized Danfoss TX-FH dealer. Failure to comply with these terms voids the warranty. If a defect is documented at the date of delivery, Danfoss will, at its option, repair or supply a new Danfoss TX-FH cable. All claims must be made within the extended warranty period. Danfoss is not liable for claims made later than twenty years from the purchase date, nor for consequential or secondary costs or damages linked to defects or replacements. Liability for costs related to dismantling defective products and installing new ones is limited to five (5) times the initial product costs per damage/case.

This warranty is expressly in lieu of all other warranties, express or implied, including warranties of merchantability or fitness for a particular purpose. Danfoss neither assumes nor authorizes any other person or entity to assume any other liability in connection with the sale or product. Danfoss is not responsible for damage to persons or property, consequential loss, loss of profit, or losses on goods in store, arising from equipment failure, regardless of cause (including faulty manufacture).

How to claim this warranty

Contact Danfoss Customer Service and provide the following information:

1. Nature of the manufacturing defect.
2. Date of purchase and, if installed, date of installation.
3. If installed, the name of the electrician and foundation installer.
4. Resistance readings taken by the installer.
5. Proof of purchase and serial number from the product label.

Danfoss Customer Service will provide an authorization number and guide you through the next steps for your warranty claim.

Disclaimer

This warranty grants specific legal rights. Additional legal rights may vary by state or province. Danfoss disclaims, as a condition of sale, any implied warranties. Some states and provinces do not allow limitations on implied warranties, so the above limitation may not apply to you.

Manufacturer Information

Mail: Danfoss Inc., 6711 Mississauga Rd., Suite 410, Toronto, ON L5N 2W3

Phone: 905-285-2050

Fax: 905-285-2055

Appendix A: Layout Example

The diagram illustrates a typical layout for Danfoss TX-FH heating cables. It shows a serpentine pattern for covering a floor area. Key indicators include:

• Start/End points: Marking the beginning and end of the cable run.
• Spacing: Recommended cable spacing of 6 inches, with a minimum of 4 inches. The diagram also indicates a 10" to 15" measurement, likely for sensor placement or conduit routing.
• Thermostat Connection (T): Indicates the point where the thermostat connects to the system.

Connection diagrams for controllers are also shown:

• USG-4000: Depicts connections for power (IN/OUT) and sensor (ABCD).
• UCG/UDG/UTN: Also shows connections for power (IN/OUT) and sensor (ABCD).

Danfoss can accept no responsibility for possible errors in catalogues, brochures, other printed materials, and website information. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alteration can be made without subsequent changes being necessary in specifications already agreed upon. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are registered trademarks of Danfoss A/S. All rights reserved.

Danfoss Inc.
Toronto
Toll Free: 866-676-8062
Phone: 905-285-2050
Fax: 905-285-2055
Website: www.LX.Danfoss.com