Lay the Heating Cable - MyHeat Underfloor Heating

Lay the Heating Cable - MyHeat Underfloor Heating
MYHEAT
Installation Advice
R
Electric Underfloor Heating Systems
= Ensure the floor is clean, dry and free from sharp objects
before laying the cable.
= The cable is extremely tough however care should be
taken when installing to minimise any potential damage.
= Always use a plastic trowel and never store objects on the
cable during installation. Avoid unnecessary foot traffic
over unprotected cable.
= A flexible tile adhesive is required when tiling over
underfloor heating.
= Check the continuity and resistance of the heating cable
before, during and after installation. Check against
correct label value.
UNDERFLOOR HEATING CABLE KIT
INSTALLATION GUIDE
= The installation must be protected by a 30mA RCD for safe
operation (not included).
= Plan your installation carefully. Calculate your actual heated
floor area in square metres, Refer to table 1 for cable kit
coverage and cable spacings.
= The heating cable must not touch, cross or overlap itself
at any point. Ensure a minimum gap between cables of
50mm.
= Consider thermal insulating boards to improve heating
efficiency and heat-up times. Especially on concrete
subfloors. These boards are usually 10mm thick. On
suspended wooden floors always overboard the floor with
a surface suitable for tiling. Either tile backer board or WPB
plywood.
= Do not install the heating cable directly under permanent
fixtures (baths, toilets etc) under carpet or other nonmasonary flooring.
Plan your installation using a sketch, marking your laying
pattern and the positions for the thermostat and floor limit
sensor. This is an important step as you must ensure that all
the heating cable is placed under the tiles and that you
have the correct cable size to fit the floor and provide even
heat distribution.
First measure the “free floor area” that you want heated. When
calculating this area do not include the areas under fixed floor
furniture like baths, WC’s, cabinets etc. Then allow a minimum
perimeter clearance of 50mm around the edge of the room.
With this calculated value, check that you have the
correct kit size from table 1 and obtain the cable spacing.
It is important that this planning is done as the heating cable
can never be cut or shortened.
Step 1: Floor Instructions
Concrete Subfloors: The insulation level of your subfloor will
effect the performance and running costs of your floor heating
system. For optimum performance it is recommended that an
insulated tile backer board is installed on a concrete subfloor
before laying the cable. This will minimise heat losses to
the subfloor, reducing heat up times and running costs. The
cable can be laid directly onto an uninsulated concrete floor,
however it is not recommended.
Wooden Subfloors: Should be reinforced and stabilised to
prevent flexing and dislodging of tiles. Overboard timber floor
boards or chipboard with a surface suitable for tiling, as a rigid
base is essential. Either tile backer board or WBP plywood
fixed securely.
1.
1. Tile / stone floor
2.
2. Tile adhesive / self levelling compound
3.
3. Cable
4.
5.
The floor should be level and dust free. New concrete screeds
should be well cured and wooden floor boards should be well
secured with screw fixings to prevent movement.
Insulation boards should be laid onto a suitable flexible tile
adhesive which has been applied with a notched trowel. Lay
boards in a staggered pattern. Boards should be thoroughly
bedded ensuring no air pockets remain. Joints can be taped
with a fibreglass reinforcing tape.
Step 5: Prime the Subfloor
Use the primer and roller contained in the kit to prime the
subfloor. Apply primer evenly and allow sufficient time for the
primer to dry (usually 1 – 3hrs depending on temperature
conditions).
Avoid foot traffic over the floor area, once primed.
For larger areas or absorbent surfaces the primer may need
to be diluted with water. See primer instructions on bottle.
Step 3: Heating Control
Step 6: Test the Heating Cable
The floor heating cable must be controlled by a thermostat
with a floor limit sensor. The choice ranges from a
sophisticated timer/thermostat with LCD display that can be
programmed for convenience to simple manual thermostat
with temperature dial adjustment with an on/off switch.
Before you start laying the heating cable, test it while it is on
the reel. Use a multimeter (Ohm meter) to ensure that the
resistance equals the value on the cable label or from table 1.
You should plan to check the heating cable resistance
regularly during the tiling process.
Whatever type you have chosen to install, the thermostat
should be installed within the room to be heated.
For bathrooms or shower rooms the thermostat must be
placed outside the room but as close to the installation as
possible. Control of the heated floor in this application is
provided by the floor sensor only.
If the resistance reading varies outwith the tolerance (-5 to
+10%) stop immediately and call the technical helpline.
Refer to the thermostat instructions for installation
and technical information.
4. Thermal insulation
5. Concrete / suspended timber floor
= The cold lead is 3m long. It can be cut / extended to suit the
location of the mains power connection box.
= Thermostat floor sensor location should be centred
between 2 runs of the heating cable.
Step 4: Lay the Thermal Insulation
Example of planning sketch
Pre-Installation Check List
Products:
Heating cable drum – ensure correct size before unrolling
Floor primer and roller
Adhesive fixing tape
Thermostat inc floor sensor + sensor conduit
Insulation boards (if required)
RCD 30mA (Residual Current Device) if not already fitted
Tools:
Multi-meter for checking continuity and resistance
Measuring tape and marker pen
Installation Advice
= All electrical wiring must be carried out by a fully qualified
Electrician in accordance with the current IEE wiring
regulations.
Step 2: Planning
Manual
Programmable
Step 7: Lay the Heating Cable
Mark the layout of the heating cable on the prepared subfloor
with a fibre tipped pen.
Mark the perimeter of your heated area together with the cable
spacing. The cable spacing and perimeter wall clearance must
be a minimum of 50mm. Mark the position of your start point.
Ensure that this is close to the planned thermostat position.
The cable “cold tail” lead is 3m long.
Start unrolling the heating cable, according to your floor
markings and lay in parallel loops. Secure the cable to the
floor with strips of adhesive tape. At this point only use a
minimal amount of fixing tape as you may have to reposition
the cables once the whole cable has been installed to achieve
the best fit (see diagram below).
The cables must be looped in regular intervals providing the
floor with an even cover. If you have excess heating cable at
the end of the installation you may have to adjust the cable
spacing. If, after adjustment, the heating cable spaces are
less than 50mm, do not proceed with the installation as your
heating kit is too large for the area.
Once you are satisfied with your cable layout pattern, tape the
cable down using the rest of the fixing tape. It is important to
securely tape the cable as this offers protection from damage
and prevents movement during tiling.
Step 7: Lay the Heating Cable
Step 8: Install the Floor Sensor
Install the thermostat floor sensor by threading into the
supplied protective conduit. Tape the end of conduit to
prevent the adhesive entering. The conduit should be
positioned between two cable runs. Ensure that you have
sufficient sensor cable to stretch back to the low level
junction box. Avoid crossing over any of the heating cable.
You will need to recess the conduit into the floor by creating
a groove so that it is below the finished level of the heating
cable.
Step 11: Wiring Up (Electrician Only)
A fully qualified electrician must now make the final
connections to the main supply and install the thermostat.
The electrician should check for continuity of the floor sensor
and test the resistance of the cable. This reading should be
recorded on the installation plan record sheet.
Step 12: Guarantee Certificate
Following installation the guarantee certificate and installation
plan record sheet should be fully completed. The installation
plan should include a sketch/plan of the cable layout and
position of the floor sensor. The guarantee certificate,
installation plan and purchase receipt should be permanently
fixed near the consumer unit.
Step 13: Switching On
500mm
Wait at least 7 days before turning on the system to allow time
for the adhesive to dry.
Follow the thermostat instructions to program your heating
system.
Step 9: Test the Heating Cable
Before commencing tiling. The heating cable should be tested
again to ensure that it has not been damaged during
installation.
FAQ’s
Q: Can I reduce the size of the cable?
A: No the cable cannot be shortened. The cable must not be
cut. It is important to buy the correct cable size for the area
you want heated at the correct heat output. See table 1 for
coverage.
Q: Can I install the heating cable myself?
A: Heating cables are easy to install by following these
simple instructions. Only the final connection to the mains
supply and installation of the thermostat must be carried out
by a suitably qualified electrician.
Q: What if I accidently damage the cable during installation?
A: The cable can, in most cases, be simply repaired by using
a cable repair kit available separately.
Q: Can I use the underfloor heating as the sole source of
heating in my room.
A: If you are considering the heating cable as the sole
source of heating in a room you need to ensure that you
allow sufficient heat input to cover the heat losses. Take
advice from your Architect or Heating Engineer to calculate
the heat input (cable size) required.
Q: Why can’t I turn on the heating system immediately
after tiling?
A: Turning on the heating system before the tile adhesive
has fully cured will accelerate the drying out process. This
may cause micro cracking of the material which could be
detrimental to it’s long term performance.
Technical Information
Contact Information
Table 1.
Please contact us if you have any problems
with the installation of your heating cable.
Area to be
Covered
m2
Cable
Length
(m)
Power
(w)
Current
(a)
Resistance
( Ohms )
130w/m2
c-c=77mm
Area(m2)
150w/m2
c-c=67mm
Area(m2)
200w/m2
c-c=50mm
Area(m2)
0.3-0.5m2
6.6
65
0.3
813.8
0.5
0.4
0.3
0.6-0.9m2
11.4
120
0.5
440.8
0.9
0.8
0.6
Using Tile Adhesive
Use flexible tile adhesive suitable for use with underfloor
heating. Ensure the heating cable is fully taped and fixed in
position. The cable should initially be covered with a layer of
tile adhesive applied with a rubber backed trowel or similar
taking care not to dislodge or damage the cable. Ensure the
cable is completely covered with no gaps or air pockets.
Once dry, another layer of adhesive can then be applied
carefully using a notched plastic trowel to comb the adhesive
before laying the tiles.
0.9-1.5m2
18.9
200
0.9
264.5
1.5
1.3
0.9
1.2-1.8m
2
23.6
250
1.1
211.6
1.8
1.6
1.2
1.6-2.4m2
31.6
320
1.4
165.3
2.4
2.1
1.6
1.8-2.8m2
36.9
400
1.7
132.3
2.8
2.5
1.8
2.3-3.5m
2
45.7
450
2.0
117.6
3.5
3.1
2.3
2.5-3.8m2
49.6
520
2.3
101.7
3.8
3.3
2.5
3.2-4.9m2
63.9
600
2.6
88.2
4.9
4.3
3.2
Address:
3.8-5.8m
2
75.8
750
3.3
70.5
5.8
5.1
3.8
Queensway Ind Est,
Using Self Levelling Compound
This method provides a smooth surface to tile on while
protecting the heating cable when tiling. It is the recommended
method for all but the smallest installation. A flexible self
levelling compound that is suitable for underfloor heating
must be used. Mix the compound and pour the self levelling
compound over the installed cable to a depth that the cable
is completely covered with no air pockets or voids. Allow to
completely dry before laying tiles using a flexible tile adhesive
suitable for underfloor heating.
4.4-6.7m
2
87
950
4.1
55.7
6.7
5.8
4.4
5.5-8.8m2
114.5
1100
4.8
48.1
8.8
7.7
5.5
Glenrothes, Fife, KY7 5QF
131.3
1300
5.7
40.7
10.0
8.8
6.6
158.8
1700
7.4
31.1
12.0
10.6
7.9
For information about our products visit
194.5
2000
8.7
26.5
15.0
13.0
10.0
our website at www.myheat.co.uk
Step 10: Complete Your Installation
6.6-10.0m2
7.9-12.0m
2
10.0-15.0m
2
Technical helpline: 0800 954 8862
Fax: 0800 954 8863
Email: sales@myheat.co.uk
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