Supporting frame made of special aluminium profiles, connected with aluminium corners. Construction sides are closed with thermo and acoustic insulated panels. In thus structure (UU universal section) are incorporated all necessary elements for air treatment.
Panels made of galvanized sheet steel with powder coating at their external side (RAL7035) and heat and acoustic insulated middle layer.
Two versions of side panels are possible:
- Standard thickness of 25mm for model sizes from AHU 06 to AHU 20
- Standard thickness of 50mm for model sizes from AHU 2 to AHU 45H
- On request - for outdoor installation with thickness 50mm (AHU06 – AHU20)
Insulation panels made of extruded polystyrene XPS type with density 32 kg/m³, thermal conductivity λ=0.039 W/m K and combustibility class M1. Upon request panels could be made of compressed mineral wool with density 60-100 kg/m³, thermal conductivity λ=0.037 W/m K and combustibility class M0.
The panels are fixed with self-tapping screws or metric bolts. Sides which should be opened for inspection and maintenance are performed as doors, equipped with knuckles and special locks. Revision covers could be fixed to the supporting frame with reamers – upon request. Visual inspection is made through manhole incorporated in the panel.
Sealing of the panels to the constructions is ensured by strips of self-adhesive cellular rubber.
ВU - Fan section
The section consists of centrifugal fan with forward or backward curved impeller. The type of fan is selected depending to the specific requirements, according to the air flow and resistance of the installation:
- BDB - Belt-driven double inlet centrifugal fan with backward curved impeller, standard version (section 03.07)
- CBP - Belt-driven double inlet centrifugal fan with forward curved impeller (section 03.08) only for models AHU 06, AHU 09, AHU 12
- BPF - Direct-driven single inlet centrifugal fan with backward curved impeller. The impellers made by “Soler&Palau” are statically and dynamically balanced.
Mounted to the frame on anti-vibration mounts, equipped with flexible connection. This avoids the transmission of vibration to the casing.
Fans are driven by electrical motor, using belt drive or directly incorporated to the fan. The belts which are used are type B or SPB. Belt pulleys are with fixing bush (hub). For easier belt tension motors are installed on a slider.
All motors are three phase 400V/50Hz, protection class IP54, class F insulation and working mode S1 (continuous). Ambient temperature: - 30°C ÷ +40°C.
Maximum working temperature +60°C and maximum altitude 1000m.
ТU - Thermal section
Include heating and/or cooling section (heat exchanger), drop separator and drain tray.
Types of sections (heat exchanger) that could be incorporated (section 02.05):
- Two-rows (2R) – basically used in heating mode.
- Four-rows (4R) – basically used in cooling mode.
- Six-rows (6R) and eight-rows (8R) could be produced upon request.
Heat exchangers “Water-air” (heating and cooling) are tubular-plate type, made of copper pipes with strung on them aluminium fins with step 2.3mm. Good contact between pipes and fins is achieved by mechanical distension. Incorporated in the section by guides (rails), ensuring the sealing by air.
Drop eliminator is a cassette of profiled blades, designed to retain the condensation after the cooling section. Made of special polymer profiles. Drain tray with ½’’ connection, is mounted at the bottom of the cooling section.
Siphon must be ensured. He should be placed before condensation line is connected to the building installation.
AFU - Air filter section
Air filter section contains one or two consequently mounted air filters with different efficiency from lower to higher class from G2 to F9, according BDS EN 779 (section 02.03).
For rough dust several air filter cassettes type AFC-V (class G3) or AFC-Z (class G4) are mounted together. The cassettes slide into the section through glides (rails) and are fixed with profiles and bolt connection.
For fine purification filter wall made of several bad filters type AFC-B (class F6 – F8). The cassettes are fixed to the filter wall through reamers.
Air filter cassettes are disposable, they are consumables for the air handling units.
In more specific the section could be completed with other type air filters: reusable metal filters, carbon or absolute filters, class H10 – H13.
СМU - Mixing section
Build of one or two universal sections, horizontally or vertically adjoined. Equipped with three dampers (PRJ – multiple leaf damper, section 02.09):
- Outlet (exhaust air)
- Inlet (fresh air)
- Mixing – mounted between both streams
For smooth control is recommended damper with electric motor (actuator) and device for uniform signal control.