Danfoss Outdoor Heating Applications Operating guide

Outdoor Heating Applications

Installation Guide

Outdoor Heating Applications

Mats and cables

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DEVI

VIFTH402

Installation Guide			Outdoor Heating Applications
	Tabel of Contents
1	Introduction			2
	1.1	Safety Instructions		2
	1.2	Installation guidelines		4
	1.3	System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		4. . .
	1.4	Calculating C-C distance for heating cables		5
	1.5	Planning the installation		5
	1.6	Preparing the installation area		6
2	Installing elements			6
	2.1	Installing heating elements		6
	2.2	Sensor installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7. . .
3	Applications			7
	3.1	Frost protection of roof and gutters		7
	3.2	Snow melting on ground areas		8
	3.3	Field/seed bed heating		10
4	Optional settings			12
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.

1.1Safety Instructions

Never cut or shorten the heating element

•Cutting the heating element will void the warranty.

The intended uses of the heating elements covered by this installation manual are shown in the following.

For other applications please contact your local sales office.

•Cold leads can be shortened to suit requirements.

		DEVI					VIFSV402

Installation Guide	Outdoor Heating Applications

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 fixed connection.

•De-energize all power circuits before installation 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.

5

6

2

7

3

4 1

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 element must

•be made evident by affixing caution signs or markings at the power connection fittings 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/m2 or W/m) for the actual application.

DEVI

VIFSV402

Installation Guide	Outdoor Heating Applications

1.2Installation guidelines

Prepare the installation			Regularly measure						Do not lay heating ele-
site properly by remov-			ohmic resistance and						ments under walls and
ing sharp objects, dirt,			insulation resistance						fixed obstacles. Min. 6
etc.			before, during and after						cm space is required.
			installation.

Keep elements clear of insulation material, other heating sources and expansion joints.

Elements may not	The elements and es-	The element should be
touch or cross	pecially the connection	temperature controlled
themselves or other	must be protected from	and not operate at
elements and must be	stress and strain.	ambient temperature
evenly distributed on		higher than 10°C in
areas.		outdoor applications.

•Store in a dry, warm place at temperatures between +5 °C to +30 °C.

1.3System overview

Standards	DEVIsafe™	DEVIsnow™	DEVIasphalt™	DEVIsport™
		(DTCE)	(DTIK)	(DSM3)
60800:2009 (cable)	M2	M2	M2	M2

M2

For use in applications with high risk of mechanical damage.

		Product selection:	DEVIsafe™	DEVIsnow™	DEVIasphalt™	DEVIsport™
				(DTCE)	(DTIK)	(DSM3)
		Frost protection of roof and gutter systems	+	+	-	-
		Snow and ice melting on ground areas	(+)	+	+	+
		Field / seed bed heating	-	+	-	+
		DEVI	VIFSV402

Installation Guide	Outdoor Heating Applications

1.4Calculating C-C distance for heating cables

The C-C distance is the distance in centimetres from the centre of one cable to the centre of the next.

For heating of gutters, please refer to the number of cables per metre, see section 3.1.

	C - C [cm] =	Area [m2]	x 100 cm
		Cable length [m]
	or
	C - C[cm] =	Cable output [W/m]	x 100 cm
		Heat density [W/m2]

1.5Planning 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

Max. C-C distance
Roof and gutter systems	10 cm
Ground areas	20 cm
Field / seed bed heating	25 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 @	W/m² @	W/m² @
		20 W/m	25 W/m	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

Save the sketch

•Knowing the exact location of these components makes subsequent troubleshooting and repair of faulty elements easier.

Please observe the following:

•Observe all guidelines - see section 1.2.

•Observe correct C-C distance (heating cables only) - see section 1.4.

•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.

•For single conductor cables, both cold leads must be connected to the connection box.

DEVI

VIFSV402