Electric bare-wire batteries for air heating

GENERAL CHARACTERISTICS

Electric bare-wire heating batteries are made by coupling a series of modules or bare wire heating coils, which are mounted on the air duct by means of galvanized sheet or stainless steel frames.

The (bare wire) resistive coil is composed of one or more resistance wires, either straight or suitably shaped, and fixed to insulating supports made of ceramic material.

The heaters are equipped as standard with protection grids, automatic reset thermoprotectors and connection cables. On request, the related electrical circuit can be supplied as well (i.e. contactor, switch, terminal board, etc.).

The resistive coil of the bare wire resistors can be arranged on one side only or on both sides, with the aid of metal supports whose function is to make the resistor structure more reinforced and compact.

The bare wire batteries are built exclusively with the use of top quality materials, which ensure the resistance wire a high estimated operating life (wire of FeCrAl material, NiCr and special alloys), especially under high thermal stress conditions due to continuous thermal expansions resulting from frequent intermittent ON/OFF cycles at high temperatures. Nevertheless, the materials used to support the resistive coils of these resistors too maintain the highest thermal insulation standards and are free from chemical reactions. Typically, they are coupled to ceramic or refractory supports of cylindrical shape crossed by channel sections suitable to house the resistive coils.

There are mainly two versions of bare wire heating batteries, namely:

• Bare wire batteries “with rectangular channel “
• Bare wire batteries “with circular channel “

They can also be easily equipped with on-board ventilation systems, if expertly coupled to connectors and fixing systems, as well as being connected to efficient temperature regulation devices.

TECHNICAL DATA:

Power supply: 1-phase / 3-phase
Standard supply voltage included in the range 24 – 440V, frequency at 50 – 60Hz.

• Installed power (standard) for standard models (type of execution without flange): range from 2kW up to 40KW (230V/1-Ph. version from 2kW to 4.5kW with standard structure dimensions of width x height x depth: from 300×240/270×45 mm to 600×240/270×45 mm) / (three-phase version 400V/3-Ph. from 3kW to 8kW with external overall dimensions from 300×240/270×45 mm to 600×240/270×45 mm)
• Installed power (standard) for flanged models (type with flange and “drawer” design): range from 2kW up to 20KW (230V/1-Ph. version from 2kW to 4.5kW with standard structure dimensions of width x height x depth: from 300×240/270×45 mm to 600×240/270×45 mm) / (three-phase version 400V/3-Ph. from 3kW to 8kW with standard structure dimensions of width x height x depth: from 300×240/270×45 mm to 600×240/270×45 mm)
• Other non-standard powers: according to customer specifications
• Standard equipment:
• Anti-intrusion protection grid
• Automatic reset thermostats
• connecting cables 500 mm long
• Flange support (complete with housing for electrical connections, terminal board and cable gland) to facilitate the installation of the battery in rectangular air ducts (standard flange dimensions width x height x depth: 400x350x150 mm)
• Optional extras (on specific request):
• Manual reset safety thermostat
• Connecting cables 1000 mm long
• Protection network on both sides
• Electric circuit of the heating battery, including contactor, switch, terminal board, etc…

MAIN ADVANTAGES:

• minimum thermal inertia
• compact dimensions with powers in very reduced overall dimensions
• low weight compared to traditional heating units

MAIN USES:

Electric bare-wire heating batteries are widely used in all major sectors, such as:

• Fan coils with heat pump for air conditioning
• Professional tumble dryers
• Drying ovens
• Heating in the railway sector

SOME EXAMPLES:

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