Wall Mounted AirMaster Heat Recovery Ventilation UnitsGreat care has been taken with the casings of AirMaster units. Any exposed panels are of streamlined design so as to fit in discreetly with ceiling lines.Wall mounted units are available in 4 sizes, with ratings and usage as follows:AirMaster AM 100 100 m³/hr with 35 dB(A) @ 1m, or 75 m³/hr with 30 dB(A) @ 1m.The AM 100 is the smallest unit of the AirMaster decentralized heat recovery ventilation range. This heat recovery ventilation unit is well suited to individual offices. It can be be partly recessed in the ceiling void (as shown on right), reducing visual impact to the minimum.AirMaster AM 300300 m³/hr with 35 dB(A) @ 1m, or 240 m³/hr with 30 dB(A) @ 1m.This decentralised heat recovery ventilation unit is a useful choice when designing for partitioned spaces with higher ACH (air changes per hour), such as medical treatment and consulting rooms, offices and smaller meeting rooms. With normal office conditions, it would be good for up to 10 people.

For those applications involving internal offices away from external walls, all units larger than AM 100 in the AM range can provide ventilation using duct runs of up to 10m. AirMaster AM 500550 m³/hr with 35 dB(A) @ 1m, or 450 m³/hr with 30 dB(A) @ 1m.Catering for up to 20 people, this heat recovery unit is an efficient ventilation solution for medium sized rooms, such as offices, conference rooms and smaller classrooms. AirMaster AM 800725 m³/hr with 35 dB(A) @ 1m, or 650 m³/hr with 30 dB(A) @ 1m.A great application for this air handling unit is for offices, meeting rooms, classrooms of 30 (pupils & staff) and 60 m² floor area. Modulating control of  CO2 concentration to a desired value of say, 1,000 ppm means that the learning environment can be optimised.For rooms with suspended ceilings, AirMaster units can be embedded 1/3 or 2/3 in the void space. With each of the variants, the unit internals are reconfigured so as to always keep the supply air grille next to the ceiling surface.

This allows the Coanda air distribution effect to be maximised.Duct connections – further optionsFurther options are available in terms of duct connections, which can be made at the back (for passing through the wall) or at the top (for passing through the ceiling). Details are shown below:INTEGRATED MODELConceals up to 2/3 of the unit in the ceiling. It can be supplied complete with air intake and exhaust through the wall or the roof. The integrated model can be mounted on a wall or ceiling.This option is not available for AM 100[ML1] .WALL MODELThe air intake and air exhaust are run directly outside through the wall on which the unit is mounted. The outside wall is finished off with louvered gratings.ROOF MODELMounted like the wall model on a wall in the room, but the air intake and air exhaust are run upwards through the roof. It is finished off on the outside with roof caps and flashings. Successful operation of wall mounted unitsSuccessful operation of wall mounted direct ventilation air handling units is dependent on keeping a smooth, even ceiling surface over the air throw area.

Throw distance varies between 5m for the AM 100 and 7m for the AM 800.As the diagram below shows, the AirMaster heat recovery ventilation units distribute the supply air to different degrees, depending on the given airflow. car ac repair in azThe blue tones on the illustration show the airflow at different throws.central ac unit freezes upIt is important to avoid obstructions to air flow from structural beams or light fittings. how to tell the age of a carrier ac unitWhere lighting provision exists, the use of recessed or pendant fittings would prevent any restriction to the Coanda effect.For rooms with sloping ceilings, wall mounted air handling units must be placed as high as possible. The Coanda effect still holds good even though the throw area is inclined.

Advice on the sizing and positioning of direct ventilation units is part of SAV Systems’ effort to ensure that every AirMaster air handling unit delivers outstanding performance. We are used to dealing with project layout drawings at all stages, and are happy to become involved whether at project feasibility, initial design, tender or construction. Airmaster Norge AS - Subsidiary NO - 2380 Brumunddal +47 99 08 04 44 NO - 5035 Bergen +47 55 32 37 50 Airmaster AB - Subsidiary S - 518 21 Sandared +46 (0) 706 536 536 Airmaster Applied Solutions Ltd. - Subsidiary Innovation Centre, Gallows Hill UK - Warwick CV34 9PF +44 (0) 8448 099 993 UK - Surrey GU21 5BX +44 (0) 1483 771 910 D - 53359 Rheinbach +49 (0) 2226 92050 AT - 9163 Unterbergen/Rosental CH - 5430 Wettingen +41 (0) 56 438 12 12 Adm. de Ruyterstraat 2 NL - 3115 HB Schiedam +31 (0) 10 427 85 00 +32 (0) 9 2105 715 157, av. Charles Floquet

FR - 93150 Le Blanc-Mesnil +33 (0) 1 48 65 75 61 FI - 48100 Kotka +358 45 185 0690 Which unit to choose? Do not miss out on important news within indoor climate, products and much more from Airmaster. Each AirMaster Demand Controlled Ventilation air handling unit with heat recovery has 2 dampers (main and bypass), both of which are placed on the air supply side leading to the contraflow heat exchanger.The main damper opens fully as long as the AirMaster air handling unit is in operation, and is closed at all other times. By having the air inlet pathway sealed off during out of service periods, the risk of draughts arising from head-on wind is eliminated.The bypass damper has a modulating actuator and is used for temperature control. It is actuated when room temperature rises above set point. The bypass air pathway has inherently lower resistance than the main path through the exchanger, which enables a proportion of air to make its way directly through to the room without gaining heat from the exchanger.

This contributes to the cooling effect.Bypass actuation is the first step taken by the AirMaster air handling unit control system to reduce room temperature. It is completely automatic and gradual enough to be imperceptible to the room occupant. There is no manual setting required of the bypass damper.Bypass operation of the heat recovery ventilation unit is sometimes called ‘free cooling’. AirMaster control systems bring on cooling functions in sequence, with priority given to the lowest running cost method. Thus, after bypass possibilities are maximised, supply air is then ramped up. Only after the bypass is fully open and supply air is at full throughput would the cooling module be brought into service (if there is one).If room temperature rises above desired setting, during day time operation AirMaster heat recovery ventilation units will act to reduce this temperature in 3 stages: (1) The bypass damper opens automatically. This diverts a portion of the incoming air around the counterflow heat exchanger, decreasing the temperature of the inlet supply air.

No manual intervention or unit stoppage is required to adjust the bypass damper position.(2) Supply air flow is increased to 100% of design throughput, regardless of extract air flow remaining at less than this. This also reduces supply air temperature.(3) The cooling module is activated (if there is one). The automatic bypass function and night time cooling ensure that the inlet and room temperature are kept down. If this is insufficient, effective temperature reduction can be achieved using a cooling module. Cooling modules are designed to match the shape of the AirMaster heat recovery ventilation units that they are paired with. They fit between the unit back surface and the mounting wall, and have side panels which conceal the join to the heat recovery ventilation unit. Cooling modules have a compressor and work on the refrigeration principle.Sequential operation of (1) bypass damper, (2) fan, (3) cooling module, ensures that the most energy efficient methods are given priority. Put another way, the sequence is designed to hold off action by the cooling module as long as possible, as energy is required to power the compressor.

In addition, there is a further cooling mechanism termed night cooling.If room temperature during summer day time hours exceeds the maximum set level, AirMaster ventilation units can automatically cool down the room by night time operation. Night air passing over internal room surfaces has a cooling effect, so that air coming into contact with the same surfaces early the following day would be itself cooled.With night cooling, fan motors are run at the cheapest electricity tariff, helping to reduce the cost of day-time operation by cooling modules.Temperature control by air management provides sufficient protection against frost at direct ventilation unit installations in the UK. No specific provision (such as an electric coil upstream of the air inlet filter) needs to be made.If a shortfall in room temperature is detected, AirMaster heat recovery ventilation air handling units respond automatically by both (a) reducing inlet air flow and (b) leaving the extract air flow unchanged. This produces a rise in temperature of the inlet air.

A side-effect to this is a slight air imbalance with under-pressurisation of the room relative to the outside. Whilst operating in this mode, air ingress can be expected through the building structure. If this is considered undesirable, additional temperature control can be provided by comfort heating surfaces placed next to the air supply grille.‘Comfort heating’ electric elements are designed for winter operation, to take any chill off incoming air. Element ratings start at 500 W (for the AM 100) and go up to 1,670 W (for the AM 1200). fort heating can also be made available by a finned water tube heating surface. Heating control is maintained by a motorised valve, programmed via the control panel. To protect against frost damage even when the water surface is not operational, a self-controlled valve admits sufficient flow to keep water temperature above freezing. Ratings for water tube surfaces are given in the same sources as in the paragraph above.Although AirMaster AHUs with heat recovery ventilation units can raise air temperature in several ways, it is important to remember that they are not designed to be the sole heating system in any room.