Danfoss ECasphalt Manuale utente
Ice and snow melting
Roof and gutters
Installation Guide
electricheating.danfoss.com
1 Introduction � � � � � � � � � � � � � � � � � � � � 3
1.1 Safety Instructions . . . . . . . . . . . . . . .3
1.2 Installation guidelines . . . . . . . . . . . . .4
2 Installation step by step � � � � � � � � � � � � � 5
2.1 Calculating C-C distance . . . . . . . . . . .5
2.2 Planning the installation . . . . . . . . . . .5
2.3 Preparing the installation area. . . . . . . .6
3 Installing elements � � � � � � � � � � � � � � � � 6
3.1 Installing heating elements. . . . . . . . . .7
4 Applications � � � � � � � � � � � � � � � � � � � � 7
4.1 Frost protection of roof and gutters . . . .7
5 Optional settings � � � � � � � � � � � � � � � � � 9
Table of Contents
1 Introduction
In this installation manual, the word“element”refers
to both heating cables and heating mats.
If the words“heating cable”or “heating mat”are
used, the instruction in question applies only to this
type of element.
The intended uses of the heating elements covered
by this installation manual are shown in the follow-
ing.
For other applications please contact your local sales
oce.
1�1 Safety Instructions
Never cut or shorten the heating element
• Cutting the heating element will void the
warranty.
• Cold leads can be shortened to suit require-
ments.
!
Elements must always be installed according to
local building regulations and wiring rules as well
as the guidelines in this installation manual�
• Any other installation may hamper element
functionality or constitute a safety risk, and will
void the warranty.
Elements must always be connected by an
authorised electrician using a xed connection�
• De-energize all power circuits before installa-
tion and service.
• Each heating element screen must be earthed
in accordance with local electricity regulations
and connected to a residual current device
(RCD).
• RCD trip rating is max. 30 mA.
• Heating elements must be connected via a
switch providing all pole disconnection.
• The element must be equipped with a correctly
sized fuse or circuit breaker according to local
regulations.
1
2
3
4
5
6
7
1. Heating cable
2. Thermostat
3. Sensor
4. Screen
5. RCD
6. All-pole switch
7. Fuse
Connections
• Phase - Brown
• Neutral - Blue
• Earth - Screen
The presence of a heating mat must
• be made evident by axing caution signs or
markings at the power connection ttings and/
or frequently along the circuit line where clearly
visible
• be stated in any electrical documentation
following the installation.
Never exceed the maximum heat density (W/m
or W/m) for the actual application�
1�2 Installation guidelines
Prepare the installation site properly by removing
sharp objects, dirt, etc.
Regularly measure ohmic resistance and insula-
tion resistance before and during installation.
Do not lay heating elements under walls and xed
obstacles. Min. 6 cm air is required.
Keep elements clear of insulation material, other
heating sources and expansion joints.
Elements may not touch or cross themselves or
other elements and must be evenly distributed
on areas.
The elements and especially the connection must
be protected from stress and strain.
The element should be temperature controlled
and not operate at ambient temperature higher
than 10°C in outdoor applications.
2 Installation step by step
2�1 Calculating C-C distance
The C-C distance is the distance in centimetres from
the centre of one cable to the centre of the next.
C - C [cm] = Area [m] x 100 cm
Cable length [m]
or
C - C [cm] = Cable output [W/m] x 100 cm
Heat density [W/m]
• Max. C-C distance for roof and gutter systems
is 10 cm.
• Heating cable bending diameter must be at
least 6 times cable diameter.
• The actual cable length may vary +/- 2 %.
230V/400V
C-C
[cm]
W/m² @
20 W/m
W/m² @
25 W/m
W/m² @
30 W/m
5 400 500 -
7,5 267 333 400
10 200 250 300
12,5 160 200 240
15 133 167 200
20 100 125 150
25 80 100 120
2�2 Planning the installation
Draw a sketch of the installation showing
• element layout
• cold leads and connections
• junction box/cable well (if applicable)
• sensor
• connection box
• thermostat
Save the sketch
• Knowing the exact location of these compo-
nents makes subsequent troubleshooting and
repair of faulty elements easier.
Please the following:
• Observe all guidelines - see section 1.2 .
• Observe correct C-C distance (heating cables
only) - see section 2.1.
• Observe required installation depth and
possible mechanical protection of cold leads
according to local regulations.
• When installing more than one element, never
wire elements in series but route all cold leads
in parallel to the connection box.
• Two or more elements may be installed in
the same room but a single element is not
to be installed across two or more rooms.
• All heating elements in the same room must
have the same heat density (W/m) unless
they are connected to separate oor sensors
and thermostats.
• For single conductor cables, both cold leads
must be connected to the connection box.
2�3 Preparing the installation area
• Remove all traces of old installations, if appli-
cable.
• Ensure that the installation surface is even,
stable, smooth, dry and clean.
• If necessary, ll out gaps around pipes,
drains and walls.
• There must be no sharp edges, dirt or foreign
objects.
3 Installing elements
It is not recommended to install elements at temper-
atures below -5 °C.
At low temperatures, heating cables can become
rigid. After rolling out the element, briey connect
it to the mains supply to soften the cable before
fastening.
Measuring Resistance
Measure, verify and record element resistance dur-
ing installation.
• After unpacking
• After fastening the elements
• After the installation in nalized
If ohmic resistance and insulation resistance are not
as labelled, the element must be replaced.
• The ohmic resistance must be within -5 to +10
% of the value labelled.
• The insulation resistance should read >20 M
after one minute at min. 500V DC.
3�1 Installing heating elements
Observe all instructions and guidelines in section 1.1
and 1.2.
Heating elements
• Position the heating element so that it is at
least half the C-C distance from obstacles.
• Elements must always be in good contact with
the heat distributor (e.g. concrete).
Heating mats
• Always roll out heating mats with the heating
cables facing up.
• When the heating mat reaches the area bound-
ary, cut the liner/net and turn the mat before
rolling it back.
Extending cold leads
• Avoid extending cold leads if possible. Wire
cold leads to e.g. junction boxes or cable wells.
• Be aware of power loss in the cable according
to local regulations.
4 Applications
4�1 Frost protection of roof and gutters
1
2
3
4
5
6
7
1. Roof edge / eave
2. Gutter
3. Downpipe to frost-free well
4. Gutter valley
5. Flat roof with drain
6. Roof with baes
7. Downpipe with open end
To provide sucient heat in gutters and down pipes,
the heat density and the number of cable lines [n]
depends on:
• design temperature
• the gutter/pipe diameter
Gutter/pipe diameter No. of cable lines [n]
75 - 120 mm 1
120 - 150 mm 2*
150 - 200 mm 3
* Two lines of 30 W/m (60 W/m) require minimum
Ø120 mm downpipe and a moisture sensitive con-
troller, e.g. ECtemp 850 .
Design
temperature
Heat
density ECsnow 20T (EFTCC)
[°C] W/m [n] [C-C in cm]
0 to -5 200 - 250 1 9
6 to -15 250 - 300 2 7 - 8
16 to -25 300 - 350 2 6
26 to -35 350 - 400 3 5
Design
temperature
Heat
density ECsnow 30T (EFTCC)
[°C] W/m [n] [C-C in cm]
0 to -5 200 - 250 - -
6 to -15 250 - 300 1 12
16 to -25 300 - 350 2* 10
26 to -35 350 - 400 2* 8
Design
temperature
Heat
density ECsafe 20T (EFTPC)
[°C] W/m [n] [C-C in cm]
0 to -5 200 - 250 1 9
6 to -15 250 - 300 2 7 - 8
16 to -25 300 - 350 2 6
26 to -35 350 - 400 3 5
Installation summary
Install ECtemp 850 sensor, if any, in gutter accord-
ing to sensor manual.
Extend sensor cables and cold leads, and place
connections in a dry place. Seal all penetrations
through e.g. roofs and walls.
Inform the end user to check for and remove
sharp edges, leaves, and dirt from the heated roof
and gutter systems every autumn.
5 Optional settings
f the element is connected to a thermostat such
as a ECtemp, congure basic settings according to
the table below and as described in the thermostat
installation manual.
If applicable, adjust the temperature limit in accord-
ance with the manufacturer’s recommendations in
order to prevent damage.
Thermostat Max� load Frost protection of
roof and gutters
ECtemp 316 16A -7° C < On < +3° C
ECtemp 330 16A On < +3° C
ECtemp 610 10A On < +3° C
ECtemp 850 2 x 15A Melting < +3° C
1
1
1
2
8
3
4
5
6
7
1. Heating cable
2. Thermostat
3. Sensor
4. Screen
5. RCD
6. All-pole switch
7. Fuse
8. Junction box
VIAMZ102
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