Danfoss RX-C Installation guide
Installation Instruction
Danfoss RX-C Roof and
Gutter De-Icing System
Installation Instruction
Danfoss RX-C Roof and Gutter De-Icing System
Table of contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Certifications / Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5 Personnel requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 System design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 Power connection components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8 End-termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
9 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
10 Trace heater installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Determination of the trace heater length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Number of heating circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Required tools / equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Unrolling the trace heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Trace heater fixation on roofs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Placement of connection / splice kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Application of warning labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
11 Tests and putting into operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Measurement of the insulation resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Acceptance test and acceptance test report. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Putting into operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
12 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
13 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Visual and functional inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electrical inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Inspection intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Personnel training courses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Repairwork on roofs and gutters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
14 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
15 Acceptance report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
16 Limited product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
How to claim the warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Applicability of implied warranties, state or provincial laws . . . . . . . . . . . . . . . . . . 20
17 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
18 Sécurité et avertissements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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Installation Instruction
Danfoss RX-C Roof and Gutter De-Icing System
1 Overview
This manual introduces the installation and operation of trace heating circuits using the following
self-regulating trace heaters:
• Danfoss RX-C Roof and Gutter De-Icing System
The self-regulating trace heater features a temperature-dependent resistive element between two
parallel copper conductors, that regulates and limits the heat output of the trace heater according to
the ambient temperature. If the ambient temperature rises, the power output of the trace heater is
reduced. This self-regulating property prevents overheating which would cause damage to the trace
heater. Even crossing or overlapping with other trace heaters (or other portions of the same trace heater) are possible as given from table on page 13.
The heating system is set up as a fixed equipment heating system for roof and gutter de-icing in ordinary locations. Thanks to the parallel design the trace heater can be cut and installed to any required
length.
Multiple options for connection, splicing and end-termination of the heating circuit are available to
meet the individual requirements on site. A large variety of accessories allows for easy customization
and extensibility.
2 Safety
For safe installation and operation of the RX-C trace heater the technical requirements and instructions
given in this manual must be followed.
WARNING:
Risk of fire or electrical shock. Follow these guidelines to avoid personal injury or material damage.
• All electrical systems and installations must comply with Danfoss requirements and be installed in
accordance with the relevant electrical codes and any other applicable national and local codes.
• The US and Canadian electrical codes require ground fault protection to be provided for all trace
heating circuits.
• Install the connection system and trace heaters carefully.
• Use the trace heater and connection system in accordance with the intended purpose and strictly
comply with the operational data specified in section Technical Data.
• The bending radius of the trace heater must be at least 1” (25 mm). Do not bend on the narrow axis.
• Any defective component of the kit must be replaced before installation.
• To avoid short circuits, do not connect the trace heater bus wires together.
• Keep all components and the trace heaters dry before and during installation.
• Beware of hot surfaces when using the heat gun.
• Keep these instructions for future reference. If applicable, leave them with the end user.
• De-energize before installation or servicing.
• Use only original Danfoss accessories.
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3 Certifications / Approvals
Danfoss RX-C self-regulating trace heater for roof and gutter de-icing.
4 Technical data
Ambient temperature range -67 °F to 185 °F / -55 °C to +85 °C
Operation temperatures -40 °F to 149 °F / -40 °C to +65 °C
Voltage 110 to 120 VAC / 208 to 254 VAC
Heat output 5 W/ft @ 50 °F / 15 W/m @ 10 °C
Resistance Grounding braid: < 18.2 Ω/km
Dimensions
polyolefin outer jacket
Minimum bending radius 1” (25 mm)
0.46” x 0.23” (11.6 x 5.8 mm)
Do not bend on the narrow axis.
5 Personnel requirements
The personnel executing installation and maintenance tasks must have acquired the skills and specialized knowledge relating to the types of protection and types of devices concerned. At least, the
personnel must have:
• a general understanding of the relevant electrical engineering (Qualified Electrician)
• a working knowledge and understanding of the relevant standards for electrical installations in
general and trace heating in particular
• a basic knowledge of quality assurance, including the principles of auditing documentation, traceability of measurements and calibration of measurement instruments.
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Installation Instruction
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6 System design
A heating circuit with self-regulating trace heaters usually consists of:
• Power supply cable connection;
• End-termination;
• Control and monitoring units (optional).
The following figure shows a sample trace heating system including typical components:
junction box trace heater roof clip
end-termination
The following pages list all compatible components for the RX-C heating system for roof and gutter
applications. The respective installation instructions are included in the scope of delivery.
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7 Power connection components
The following components can be used for power connection with the RX-C trace heater:
Power connection kit
Catalog No.: 088L0023
Cable to Junction Box with
½” NPT cable gland
For connection of selfregulating trace heaters in
a junction box. Electrical
insulation is ensured by heat
shrink tubes.
Junction is not included.
Includes end-temination.
8 End-termination
The following components can be used for trace heater splices / junctions with the RX-C trace heater:
End-termination –
Connecto NA B-E Silicone end
seal for insulation of the end
of the trace heater.
Includes 5 x endcap and 2 x
Silicone adhesive.
End-termination
Catalog No.: 088L0767
Catalog No.: 088L1457
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Heat shrinkable end cap for
insulation of the end of the
trace heater.
Includes 5 kits.
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Installation Instruction
Danfoss RX-C Roof and Gutter De-Icing System
9 Accessories
The following original Danfoss accessories are available for the Danfoss RX-C Roof and Gutter De-Icing
System applications:
NOTICE: To ensure compliance with the existing technical regulations, use only original accessories
from Danfoss. The use of original accessories from Danfoss is a precondition for the consideration of
any warranty claims.
Downspout Edge Protection
Plate
Spaceclip for self-limiting
cables. One per kit.
RX-C Roof Clips
The clips are designed to
secure the cables to asphalt
shingles, metal seam roofs,
and gutters. 50 per bag.
Catalog No.: 088L3002
Catalog No.: 088L3001
10 Trace heater installation
Preparation
Before installing any electric trace heating, the person installing must check if the trace heating has
been designed and planned correctly. It is particularly essential to verify the following points:
• complete project planning documentation, operating instructions and installation instructions.
• correct selection of the trace heater and accessories with respect to:
· calculation of heat losses;
· min. permissible start-up temperature;
· max. permissible operating temperature;
· max. permissible ambient temperature.
Before installing, make sure that the roof covering, gutters and downspouts are properly installed.
Determination of the trace heater length
The total required trace heater length is determined by the length of the roof, the number of valleys
and dimensions of gutters and downspouts.
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Step 1
Determine the required trace heater length for the roof.
Standard sloped roofs Standing seam roofs
Roof overhang Roof multiplier Roof overhang Loop height
12 in (30 cm) 2 12 in (30 cm) 18 in (45 cm)
24 in (60 cm) 3 24 in (60 cm) 30 in (75 cm)
36 in (90 cm) 4 36 in (90 cm) 42 in (105 cm)
length for roofs = roof edge length * roof
multiplier
length for roofs = roof edge length + loop height
* number of seams
Step 2
Determine the required trace heater length for valleys.
Snow and ice often accumulate in valleys. The trace heater should be routed up and down the valley to
maintain a clear path of melted snow. Add approximately 6 ft. (180 cm) of heating cable for each valley.
length for valleys = number of valleys * 6 ft. (180 cm)
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