Simply effective Comfort Air Curtains Model CITY

Comfort Air Curtains Inviting and comfortable An open door to a shop or public building breaks down barriers and is inviting. But without proper separation of the indoor and outdoor air, the climate in the building will be affected. Customers and staff will be faced with draughts caused by cold outside air entering the building, while costly hot indoor air can freely escape to the outside. In winter a Biddle comfort air curtain warms the cold outside air before it enters the shop, while at the same preventing the warm inside air from escaping, through the open door. This is pleasant, both for...

Features model CITY High comfort and efficiency Low sound level Easy to use and maintain Suitable, as standard, for low water temperature (60ºC/40ºC) Ready for operation because of plug & play Clever suspension system for fast mounting Heating coil: hot water, electrical and no heating (ambient) Optional: constant outlet temperature control (2- or 3- way valve) In buildings with open doors, the Biddle air curtain provides a comfortable inner climate. Fits in any interior The neutral design ensures that the CITY will fit in any interior. The cassette and recessed models are discreetly integrated...

Technology What happens when a door is open? When a door is open, the difference between the indoor and outdoor temperatures means that air is exchanged, whereby heat is lost to the outside while, at the same time, cold outside air flows in. In most situations, there is also some underpressure in the building, which results in even more cold air entering through the open door. 20°C Air curtain with rectifier Source: TNO-research, 1995 (Dutch National Research Centre) outside door opening Open door without air curtain door opening Open door with air curtain and rectifier What does the air curtain...

Selection Type code CITY M-150-W-F Capacity S = Small (up to 2.4 m) M = Medium (up to 2.8 m) L = Large (up to 3.3 m) Unit width (cm) 100 - 150 - 200 - 250 Coil type W = hot-water heating E = electric heating A = ambient Model type F = free-hanging model R = recessed model C = cassette model An air curtain is selected properly if it is able to screen off the entire width and height of the door opening. The air curtain must be at least as wide as the doorway, to prevent cold air bypassing the air stream. In addition, the unit must have sufficient capacity to heat the entering cold outside air to...

Electric control The CITY model is equipped with electronic speed control. The standard controller, which features three keys, allows the user to set the desired fan speed easily. The controller of an electrical unit offers two additional keys to operate the electrical elements. The touch controller can be mounted to the wall in any desired location The upper side of the unit houses a connector plate with three connectors. The controller can be simply connected with the unit's connector plate using a low-voltage cable that has RJ11 plugs. One single controller allows the user to operate a maximum...

Technical data Technical data capacity is based on an outlet temperature of 35°C. For good functioning, Biddle recommends the accessory ‘constant outlet temperature control’. 2 To be used only for deviating water range, see page 8. 3 Speed 2 of the heating capacity is only possible with speed 2 and 3 of the unit. Outlet temperature is limited at 40°C.

Heating capacity The maximum heating capacity stated in the tables on page 6 and 7 are based on a water range of 90/70°C. If different water temperatures are concerned, the max. heating capacity may be multiplied by the factors from the table alongside. The air displacement and the heating capacities for each speed from the table on page 6-7 are lower, by 10% at the most, for electrically heated units. Boiler capacity For selecting the CH boiler one may depart from the heating capacity at an air outlet temperature of 35°C. Water volume Explanation formula: mw = water volume [l/h] Q = heating...

Dimensional sketches free-hanging model (F) Connector connection Connection G1” female thread Air vent Air inlet grille with filter Air outlet grille with rectifier Type CITY S/M CITY L Notes • All dimensions in mm. • The 2500 mm wide units have 3 suspension brackets, the third one is at the mid-point.

Dimensional sketches recessed model (R) Connector connection Connection G1” female thread Air vent Finishing sections are supplied separately Air inlet grille with filter Air outlet grille with rectifier E F Number of ducts per unit Type Number of inlet grilles per unit number length of inlet grille * 1 outlet grille per unit. Type L H D S CITY  S/M 1000-1500- 270 561 80-125 CITY  L 2000-2500 370 745 Notes • All dimensions in mm. • The 2500 mm wide units have 3 suspension brackets, the third one is at the mid-point. • Daylight openings (if cover moldings are used): - for air discharge 100 x (L+8)...

Dimensional sketches cassette model (C) Connector connection 250 Connection G1” female thread Air vent Finishing section, width 4 mm Air inlet grille with filter Finishing sections are supplied seperately Air outlet grille with rectifier Number of inlet grilles per unit number length of inlet grille * 1 outlet grille per unit Type L H D U A B E F G CITY S/M 1000-1500- 270 821 93 171 119 150 411 260 CITY L 2000-2500 370 1105 124.5 245.5 200 181.5 563.5 360 Notes • All dimensions in mm. • The 2500 mm wide units have 3 suspension brackets, the third one is at the mid-point. • Daylight openings if...

Specifications Casing The casing is made of zinc-plated sheet steel, extra strengthened to minimise vibration, and it has an inspection panel in the bottom. The plastic air inlet grilles have a perforated zinc-plated steel insert. The unit is as standard available in the following colours: a combination of white (RAL 9016) and greyish white (RAL 9002), and in aluminium colour (RAL 9006). Other RAL colours are available on request. Motor / fan assembly Two or more (depending on type) dual-inlet, vibration-free centrifugal fans. Each fan is driven by a suspended rotor motor on ball bearings. The...