Danfoss SLPG-10, SLPG-26, SLPG-33, SLPG-15, SLIG-18 Operating guide

Installation Instruction

Danfoss Self-limiting Heating Cables

ECpipeguard 10/25/33 (SLPG-10/26/33)
ECiceguard 18 (SLPG-15, SLIG-18)
EChotwatt 45/55/70 (SLHW-45/55/70)
ECpipeheat 10 (SLPH-10)

© Danfoss | FEC | 2019.02

Installation Instruction Danfoss Self-limiting Heating Cables

Installation Instruction

GB

© Danfoss | FEC | 2019.02 | 3088L8008 / VIAMQ502

Installation Instruction Danfoss Self-limiting Heating Cables

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2. Installation in General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3. Installing Heating Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5. Finalizing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1.1 Self-limiting Heating Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Fastening Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 Calculating C-C Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Calculating Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4 Max. Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.5 Planning the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.6 Preparing the Installation Area . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Installing Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1 Installation on Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2 Installation in pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.3 Installation Inside the Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.4 Installing on Roof and Gutters . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1 Connecting a Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1 Introduction

In this installation manual, the word “element” refers
to heating cables.

For other applications please contact your local
sales office.

Frost protection of roof and gutter systems

- see section 4.4

Frost protection of pipe systems

- see section 4.1, 4.2, 4.3

088L8008 / VIAMQ5024 | © Danfoss | FEC | 2019.02

Installation Instruction Danfoss Self-limiting Heating Cables

1.1 Self-limiting Heating Cables

Introduction

The heating cables are used mainly for ice and snow
melting on roofs and in gutters, down pipes, for
frost protection of pipes and for temperature main­tenance of the hot-water supply.

There are 4 types of Danfoss self-limiting heating
cables with various effects depending on the ap­plication.

Cable Construction

Self-limiting heating cables are designed with a
temperature dependant resistant element between
two parallel copper bus wires.

When the bus wires are connected to the mains, a
current goes through the temperature dependant
resistant element which will then heat. As the ele­ment is heated the resistance value rises causing
the current to decline and heating is reduced. This
explains the self-limiting effect.

1

2

3

5

4

The regulation of the output takes place indepen­dently on the entire length of the cable according
to the actual ambient temperature.

If the ambient temperature rises the heating effect
of the cable is reduced. Due to this self-limiting
capability, overheating of the cable can be avoided,
also if two heating cables are touching or crossing.

As self-limiting heating cables always gives off a
certain amount of effect, it is recommended to
connect the heating cable to a thermostat to be
able to disconnect the current when heating is not
required.

Due to the parallel power supply the heating cable
can be shortened anywhere. This simplifies the
planning and installation.

1. Outer sheath

2. Screen

3. Insulation

4. Self-limiting heating element

5. Bus wires

GB

1.2 Safety Instructions

This appliance can be used by children aged from 8
years and above and persons with reduced physical,
sensory or mental capabilities or lack of experience
and knowledge if they have been given supervision
or instruction concerning use of the appliance in a
safe way and understand the hazards involved.

Children shall not play with the appliance. Cleaning
and user maintenance shall not be made by chil­dren without supervision.

© Danfoss | FEC | 2019.02 | 5088L8008 / VIAMQ502

Installation Instruction Danfoss Self-limiting Heating Cables

Elements must always be connected by an au­thorised electrician using a fixed connection.

• De-energize all power circuits before installa­tion and service.

• The connection to the power source must not
be directly accessible to the end user.

• Each heating cable screen must be earthed in
accordance with local electricity regulations and

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.

• Make sure that elements, cold leads, connec­tion boxes, and other electrical components do
not come into contact with chemicals or flam­mable materials during or after installation.

Pipe Tracing

connected to a residual current device (RCD).

• Recommended RCD trip rating is 30 mA, but
may be up to 300 mA where capacitive leak­age may lead to nuisance tripping.

• 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, e.g. 10/13 A
for a 1.5 mm2 cold lead and 16/20 A for a

2.5 mm2 cold lead.

• Sensor

• Heating Cable

• Insulation

• Fitting

• Valve

1.3 Handling

• If the heating cable is delivered on a cable
drum you should use a reliable holder for the
drum when unrolling the cable.

• Pull the heating cable straight of the drum.

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 installation.

Never exceed the maximum heat density (W/m)
for the actual application.

• Avoid pulling violently, breaking or squeezing
the heating cable.

• Do not place the heating cable over sharp
objects or edges.

088L8008 / VIAMQ5026 | © Danfoss | FEC | 2019.02