Danfoss SRIG Pre Operating guide

Instructions

Danfoss SRIG Pre-Terminated Cable

Câble SRIG Danfoss avec fiche électrique

EN

FR

Instruction

Danfoss SRIG Cable

1 Introduction

Danfoss Self-Regulating Iceguard pre-terminated cable is a self-regulating cable, which is mainly used for ice and snow melting on roofs, in gutters, in down pipes and on water pipes to prevent them from freezing.

Self-regulating heating cables are designed with a temperature dependant resistant element between two parallel copper conductors.

When the conductors 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-regulating effect.

This limiting 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-regulating capability, overheating of the cable can be avoided, also if two heating cables are touching or crossing.

As self-regulating heating cables always give off a small amount of effect, it is recommended to connect the heating cable via a thermostat to disconnect the mains when heating is not required.

Danfoss SRIG cables secure against ice formations in roof gutters.

•No water damages on/in the house

•No falling icicles or icebound roof gutters

•No risks for pedestrians

•No repair costs after winter

•No frozen water pipes

	 Outer sheath
	 Screen
	 Insulation
	 Bonded jacket
	 Self-regulating heating element
	 Connecting conductor
	
	
	
	
	

2 | © Danfoss | FEC | 2020.02

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Instruction	Danfoss SRIG Cable
2 Cable specifications
Application		Roof / gutters / downpipes / water pipes
Colour		Black
Dimensions		0.52 x 0.24 inch
Sheath		Polyolefin UV
Voltage		120 V
Output		5 W/ft at 50°F
Min. installation temperature		-23°F
				EN
Min. start-up temperature		-40°F
Max. temperature ON / OFF		150°F / 185°F
Length of cold-lead		6 ft
Intended use as per IEEE 515.1		A + B
Intended use as per CSA Std. 130-03		WS + G
Approvals

•The effect stated is measured with the Iceguard heating cable installed on an insulated metal pipe, according to DIN E VDE 0254 similar to CSA C22-2, NO.130-03, 6.2.4.3.

•When self-regulating cables are installed in the open, the effect may be reduced by approx. 50%.

•When planning the installation it must be considered that self-regulating cables may reduce the operational effect over several years.

Cable heating power

W/ft
6
5
4
3
2
1
0	50	68	86	104	122	140
32

Temperature °F

The recommended test method is:

1.Power up the cable.

2.Wait 5 minutes.

3.Measure the ambient temperature.

4.Measure the amperage draw of the cable.

5.Convert the Amperage that the cable draws into Watt.

6.Dived the wattage with the feet length of the cable.

7.Compare the result with the table on page 3.

8.The result may vary up to +/- 10% due to the uncertainties of the temperature along the entire cable.

3 | © Danfoss | FEC | 2020.02

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Instruction

Danfoss SRIG Cable

3 Caution

1.Danfoss SRIG cables are only for safe (non hazardous) areas.

2.Finished or painted pipes or containers must be completely dry when installing. The heating cable must only be used in the manners recommended by Danfoss and should be properly connected to the main electrical source.

3.Connection of the heating cable must be done by an authorised electrician in compliance with all national, state, provincial and local electrical codes.

4.The heating cable must be protected against excess strain and tension.

5.Do not use SRIG for vinyl garden hose applications.

6.Do not install SRIG behind walls, in ceilings, through flooring or underneath roof covering.

7.Do not install the cable inside any pipes.

4 General installation instructions

1.Measure the insulating resistance of the heating cable immediately before the installation is begun.

2.Make sure that the necessary materials are present at the building site.

3.Remove any sharp objects and irregularities on the pipe system, so the heating cable are not damaged.

4.The surface onto which the heating cable is to be installed must be non-combustable, clean and free from sharp objects.

5.The heating cables bending diameter must not be less than 2 inches. The cable must only be bent on the flat side.

6.The heating cables screen must be grounded in accordance with local electrical regulations.

7.The power circuit must be equipped with an isolation switch or a similar overload protection device.

8.Residual current device (RCD) protection is required (max. 30 mA).

9.To reduce energy consumption we strongly recommend to switch off the heating cable, i.e. by using a thermostat.

10.At low temperatures the heating cable can become stiff and difficult to work with. This problem can be solved by connecting the cable to the mains for a short period of time.

11.The cable insulation resistance must be measured before and after installation.

12.The presence of a heating cable must be made evident by caution signs or markings at the power connection fittings and/or frequently along the circuit line, as well as being stated in any electrical documentation following the installation.

4 | © Danfoss | FEC | 2020.02

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Instruction

Danfoss SRIG Cable

5Storage of self-regulating cables

•Heating cables and connecting leads must be kept in a clean and dry place.

•Avoid contact with chemicals and petrochemical products during storage of the cables.

•Do not expose the heating cables to mechanical strain.

6Frost protection of roofs

•The storage temperature may not drop below -40°F and may not exceed +140°F.

•Are the heating cables and connecting leads kept in moist rooms or at building sites, they must be protected against moisture - also during storage for a short period (e.g. when installing the cable terminal).

EN

During periods with cold and precipitation dangerous and damaging ice formations are often formed on the roof, in roof gutters and down pipes, especially when the temperature is around freezing point.

Concerning roof constructions with low slope it is often sufficient to install Danfoss SRIG cables in roof gutter and down pipe to ensure an efficient draining off of the melt water.

Concerning roof constructions with high slope it is often necessary also to install the heating cable on the lowest section of the roof. If the roof is supplied with snow fence the cable can be installed from this to the roof edge with advantage.

Concerning valleys, the cable must be mounted in the valley. To achieve efficient protection the C-C distance should not exceed 6 inches.

Installation:

In many ordinary roof gutters it is sufficient to install one cable length in roof gutter and down pipe.

Typically, the cables should be installed with a C-C distance of approx. 6 inches. To ensure the distance spacing clips can be used.

With the above mentioned installation the system will typically ensure ice and snow melting down to a temperature of approx. 14°F.

If you want to frost protect the roof down to 4°F, a general rule will be to double the effect, and for -22°F to triple the effect.

If the cable lies across an edge etc. the spacing clips can be used to relieve strain on the cables, e.g. where the cable enters the down pipe.

Relief of a cable hanging in the down pipe is necessary when the cable length in the pipe exceeds approx. 9.8 inches.

The cable in the down pipe should continue to frost-proof depth under the surface of the ground (approx. 3.2 ft).

Cables installed on the roof must always be positioned upwards/downwards and not along the roof. The installation can be made with a zigzag pattern as shown on the illustration on the next page.

5 | © Danfoss | FEC | 2020.02

AQ004786449874en-US0201 / 088L8018