Warmup USDW-360-120, USDW-480-120, USDW-720-120, USDW-950-120 Installation Manual
TECHNICAL HELPLINES
US:1-888-927-6333
120 Volt USDW
Loose Wire
Installation Manual
The world’s best-selling electric oor heating brand™
IMPORTANT
Read this manual before attempting to install your heating
system. Incorrect installation could damage the cable and will
invalidate your warranty.
Contents
Before you start
Do’s and Dont’s
Heating cable information
Making electrical provision for
the heating system
Master/Relay cheat sheet
Subfloor preparation and
technical notes
Preparation of wood or concrete
subfloor
Wiring configuration
Installing multiple heating
systems
Installation step 1
Installation step 2
Sizing Guide
Installation step 3
Installation step 4
Installation step 5
Limited Warranty & SafetyNet
Guarantee.
Terms and Conditions
WARMUP UNDERTILE
HEATING CABLE FOR
INSTALLATION IN
FLOORS.
Your Warmup® Undertile™
Cable has been designed so
that installation is quick and
straight forward. As with all
electrical systems, certain
procedures must be strictly
followed.
Warmup Inc, the manufacturer of the
Warmup® Undertile™ Heating System,
accepts no liability, expressed or implied, for
any loss or consequential damage suffered
as a result of installations which in any way
contravene the instructions that follow.
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NA041-USDW-120-0807
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NOTE: Please ensure you do not damage the wire.
Be sure to test the system BEFORE you tile.
See pg 16 for more details.
Before you Start
Included with each Warmup heating system purchased should be the following:
• Primer
• Roller (to apply primer)
• Tape
• Installation Manual
• Thermostat
Double check your measurements and ensure you have the right cable sizes for the
area you need to heat. Bear in mind that the heating element should not be installed
under appliances or permanent fixtures and fittings such as refrigerators, washer/dryer,
cabinets, tubs, vanity units etc. Below is a quick reference guide:
120 VOLT LOOSE WIRE
If you are missing any of the box contents or believe you have the incorrect cables to
cover the area required, please call 888-927-6333 for assistance.
There will be other materials you need to complete the project which are not included
within the heating system. These include:
• Digital ohm multimeter - For heating cable testing.
• A 4” double gang electrical box (for the thermostat) - with a plaster ring
• Tile installation products and tools.
3
Cables
20 W 15 W 12 W
cable spaced at
2” 3” 4”
gives sq ft coverage of
USDW-360-120 15 22 28
USDW-360-120 22 32 40
USDW-360-120 33 47 62
USDW-360-120 44 64 84
Do’s and Dont’s
DO use a qualified installer.
DO check the heating cable with OHM meter.
DO carefully read this installation manual before commencing installation.
DO ensure the floor surface is smooth, clean and dry before priming the floor
with Warmup
®
primer.
DO ensure good ventilation during application and drying of the thermal primer.
DO plan the heating system layout and installation so that any drilling after
tiling (e.g. for fixtures such as vanity units, tubs) will not damage the wiring.
Remember to keep a copy for future reference.
DO maintain a gap of min. 2”, max. 4” between the heating cable runs at all
times.
DO make sure that ALL heating cable is positioned under the tiles in the
installation.
DO protect the heating cable, including the joint, with cardboard or hardboard
between installation and tiling.
DO use thin set mortars and grouts (latex modified), suitable for use with
underfloor heating (this will be specified in the manufacturers’ instructions).
DO check that the heating cable is working immediately before commencing
tiling.
DO take particular care when tiling not to dislodge or damage the heating cable.
DO ensure that each tile is solidly bedded in tile adhesive, with no gaps or voids
beneath.
DO remember to install the floor probe for the Warmup
®
thermostat.
DO make sure all electrical work is done by qualified persons in accordance
with local building and electrical codes, the National Electrical Code (NEC),
especially article 424, Part V of the NEC, ANSI/NFPA 70.
DO Call the Warmup Technical Helpline: 888-927-6333 if necessary.
DO ensure that you have electrical provision to run the heating system at 120
VAC, depending on the system you’re installing.
DO remember to attach the rating labels included within this manual to the
circuit breaker and thermostatic controls.
DO sketch a diagram of the heating cable layout, which should be kept with the
manual for future reference.
4
Do’s and Dont’s
DON’T attempt to connect the heating cables to any power source prior to
completion of installation.
DON’T install the heating cable under any built-in items (i.e. tubs, vanity units,
bookshelves, walls or partitions), or under any zero-clearance, dedicatedlocation furniture or appliances.
DON’T install the Warmup
®
Undertile™ Heating System under any floor other
than ceramic, quarry or natural stone tiles.
DON’T commence installation on a mud job/screed that has not been fully cured.
DON’T allow traffic over the primed floor or the installed heating cable before
tiling.
DON’T shorten the heating cable at any time.
DON’T allow the heating cables to cross over or touch each other at any point.
DON’T store tiles, sharp or heavy objects on any of the wiring while tiling or
bang a trowel on the installation area to remove excess mortar from the
trowel.
DON’T commence tiling before testing the Warmup® Undertile™ Heating System.
DON’T switch on the installed heating system until tile adhesive has fully cured
(1 - 3 weeks minimum), check adhesive manufacturer’s instructions.
DON’T clear grout lines with a utility knife.
DON’T install the heating cable on stairways, up walls or in closets.
DON’T attempt to repair the heating cable if it becomes damaged. Call the
technical helpline for further instruction: 1-888-927-6333
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Heating cable information
The heating cables consist of a fixed length of heating cable terminated at one end with
9’ of unheated lead. We recommend you do not alter the length of the unheated lead,
however if necessary, the wire can be extended if a UL-approved wire and connector box
suitable for the purpose is used (e.g. waterproof if going into the floor, etc.). This must be
carried out by a qualified electrician in accordance with local/state laws and guidelines.
Inspect the entire heating cable for damage, this includes the factory made joint and end
termination. The joint and end termination cannot be altered or remade if damaged. If
any parts are damaged contact the technical helpline (888-927-6333).
The core and ground braid are factory joined in a water resistant joint assembly to each
supply conductor and ground conductor of the unheated lead.
The Warmup Undertile™ Heating Cable is (File No. E303230).
120 VOLT LOOSE WIRE GUIDE
Warmup Heating Cable is designed for use with ceramic, quarry or
natural stone tiles. Use the Warmup Carbon Heating System for
heating under laminate, engineered wood or any other non-hardsurface
flooring.
Number of heating
cables per
15A supply point
Model Wire color Length (ft) Wattage (W) Amps (A) Resistance (Ω)
5 USDW-360-120 GREY 66 360 3.0 40.2
3 USDW-480-120 RED 99 480 4.0 30.2
2 USDW-720-120 BLACK / ORANGE 155 720 6.0 20.1
1 USDW-950-120 BLACK / GREY 216 950 8.0 15.2
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Making electrical provision for the heating system
For each Warmup® Heating cable you install, you will have 1 unheated lead running from the floor
to the thermostat’s electric connection. The joint connecting the unheated lead to the heating
cable must be at least 2 inches from the wall and placed in a position to be covered by tile and thin
set mortar.
It may be necessary to chisel out short channels in the subfloor to minimize the increased height
presented by the floor probe and the unheated lead.
All electrical connections should be done by a qualified technician.
Install to NEC and local BOCA codes.
Separate conduit will be required to run the unheated lead and the sensor wire back up to the
thermostat. Please note that they cannot be placed within the same conduit. Neither the unheated
lead or sensor wire must cross, or come into contact with, the heating element. Bear in mind that
you will need to make provision for drawing the unheated lead and sensor wire up through
the conduit to the control box.
Electrical Requirements
Please refer to the table on page 6 to calculate the amperage load for your particular system.
For smaller areas, you may be able to utilize an existing circuit. In most cases, however, you
will need a separate circuit to power the Warmup heating cables.
The Warmup thermostat has a maximum resistive load of 15 amps (i.e. a maximum of 2 x USDW800).
It also includes a built-in GFCI. If you want to control more than 15 amps worth of heating via a
single thermostat you will need to use Warmup’s master / relay configuration. Instead of using the
thermostat, a different model of master thermostat is used to control individual switching units
(each capable of switching up to a 15 amp load, and each containing its own GFCI). The relay units
require their own separate electrical feed, and up to 10 relay units can be daisy chained to a single
master unit via low voltage cabling. For further information please call the Warmup Helpline or
visit www.warmup.com.
The thermostat should be connected to the main electrical supply via a fuse or circuit in accordance
with the National Electrical Code. If the thermostat used does not include a built-in Ground Fault
Circuit Interrupter (GFCI), then one must be added to the circuit between the main power supply
and the thermostat. If the thermostat does include a GFCI, it is NOT recommended to include
another in the circuit, as this may cause accidental tripping of the control unit.
Ensuring Safety
Install the Warmup thermostat within the same room as the heating cable. In order to ensure the
efficient running of the system within bathrooms, we recommend that the controls are located
at least 36 inches away from shower openings or basin back splash areas so you minimize the
possibility of exposure to water.
The rating label in this manual must be attached to the circuit breaker box for referral by the
homeowner or electrical inspector. An additional smaller label is attached to the manual to be
fixed adjacent to or on the thermostatic control.
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Making Electrical Provision for the heating system
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Do make sure all electrical work is done by qualified persons in
accordance with local building and electrical codes, the National
Electrical Code (NEC), especially article 424, Part V of the NEC,
ANSI/NFPA 70.
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