Ceiling Heating — Installation — Floor Heating Systems — CBS Radiant Heating Australia

Ceiling Heating - Installation - Floor Heating Systems - CBS Radiant Heating Australia

1. Introduction

Safe-t-FLEX radiant ceiling heating efficiently heats to a comfortable temperature

The principle of Safe-t-FLEX heating elements is based on a continuous resistive sheet providing heat evenly over the black surface areas.

Safe-t-FLEX consists of specially formulated conductive dispersions on either an impregnated glass cloth or coated polyester film substrate. Copper electrodes are fixed parallel to each length edge. Transparent high electrical insulating film, which is wider than the black area to allow subsequent stapling of the element to the ceiling joists, completes the robust laminated product construction characteristics of Safe-t-FLEX heating elements.

For ceiling heating installations elements are normally supplied at an output of 200 W/m 2 over the heated area of element and supplied in standard overall widths of 400 mm, 450 mm and 600 mm (16″, 18″ and 24″) to accommodate standard joist centres. Other widths and outputs are available on request.

Low temperature Safe-t-FLEX ceiling heating elements produce a gentle heat that evenly warms the whole room. Once the surfaces have been warmed, the heat is reflected resulting in comfortable, natural warmth with minimum floor to ceiling temperature variation.

For a more detailed installation guide in pdf format, or an installation guide for the Safe-t-CASSETTE Heating Cassettes, see our Downloads section.

2. Installation Procedure

Safe-t-FLEX radiant ceiling heating carbon film: easy to install

Before commencing work on site, check:

  1. The building is weatherproof, with glazing and doors in place.
  2. Any floor screeds, asphalt etc. above heated ceilings have been laid and allowed to dry out.
  3. All electrical-insitu mechanical services through ceilings are completed, including lagging to any pipe work.
  4. Joists and battens have been positioned at accurate and agreed centres. In certain instances cross noggins may have been fitted to allow additional cross fixing of ceiling boards. Where this has occurred the Safe-t-FLEX element should be cut and reconnected as illustrated by referring to Instruction 7.

Element layout drawings are not normally required for Safe-t-FLEX Installations, thus enabling elements to be cut and fixed on site to accommodate last minute alterations to joist and service layouts.

  1. Firstly, check that the element identification labels and information printed on the selvedge complies with the grade required for the installation and the quantities shown on the installation Test Certificate.
  2. Fixing Wiring harness from the room thermostat to heating elements.

1.5 mm 2 — 2.5 mm 2 standard single double insulated t.p.s. cables are used for making up the wiring harness. The cable size used depends on circuit load and de-rating factors. Olex, Pirelli, C.M.A, Burton, etc or approved equal cables may be used and are available from CBS Radiant Heating Systems or your local supplier.

Safe-t-FLEX heating elements are designed to accommodate a current carrying capacity of 10 amps. Consideration must be given by the Electrical Contractor in respect of the individual ceiling heating circuit ratings relative to thermostat rating, circuit breakers and the need for switching contactors where time clock control is incorporated.

Text Box: Easy to install and wire Safe-t-FLEX element simply staples to ceiling joists.

Normal good wiring practice must be observed and the wiring must comply with local electrical authority requirements. Holes for carrying the cables must be drilled at least 50 mm below the top of the ceiling joists where the cables cross over joists which would support floorboards, the cables must be positioned so that they cannot come into contact with any heated part of the element. Note that all main distribution boards incorporate an E.L.C.B. device or combination R.C.D. for each circuit.

3. Install Thermal Insulation

This will normally be glass fibre, mineral wool quilt and be 75 mm — 150 mm thick. Other insulation types may be used. Do not use insulation containing cellulose or other combustible type material. In all instances, only non-combustible, non-metallic thermal insulation must be used and have the equivalent R-value to glass fibre or mineral wool insulation. Foil faced material should not be used next to the heating element, be it in the form of a vapour check or as part of the insulation. Ensure that no insulation is trapped between the element and ceiling, particularly when using loose fill type insulation. Where vapour checks, are specified by the Architect, these are best provided in the form of a polythene membrane positioned between the Safe-t-FLEX ceiling heating elements and ceiling board depending upon the house type and construction. If in doubt further advice should be sought from your specifying authority.

Fitting the vapour check, following the installation of the Safe-t-FLEX ceiling heating elements, helps prevent damage to the membrane during looping of elements and final connection to the elements. The installing engineer must ensure that the vapour check covers the entire room with joints overlapped and taped.

The insulation quilt should be positioned to lie firmly onto the Safe-t-FLEX element so as to minimise the air space between the element and the insulation.

Safe-t-FLEX radiant ceiling heating carbon film: cross section of installation

In some instances, insulation can be installed after the Safe-t-FLEX elements have been fixed, for example in the roof void of bungalow type construction or pitched roof two storey dwellings.

When positioning insulation in the roof space, care must be taken not to block the eaves opening, thereby restricting ventilation into the roof void.


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