VEX330H Compact unit

VEX330H Compact unit

One of the most compact air handling units with counter flow heat exchanger on the market. Optimised design in terms of temperature efficiency, airflow and energy consumption. Despite being very compact in size, ease of servicing is a key feature.

The VEX330H is ideal for residential ventilation, where the air is separated via the ventilation system, removing the risk of odours and humidly being transferred.

The side panels on both sides of VEX330H models can be removed (easy access). This allows the unit to function as both a LEFT and RIGHT version.

The unit can also be ordered as an outdoor model. The outdoor unit has a fitted cover that protects it against wind and weather.

In principle, EXHAUSTO VEX units are designed for use in comfort ventilation - i.e. under ordinary operating conditions.

Where ventilation solutions are required for rooms with high air humidity - e.g. due to humidification, we recommend you make a test calculation with one of our calculation programs. If the calculation shows a risk of condensation after the heat exchanger, an assessment must be made whether the operating conditions can be changed, or whether the unit must be modified to allow condensate to drain off. This is particularly relevant for VEX100CF.

Contact EXHAUSTO for advice on this.

VEX330H Bypass de-icing

The VEX330H is designed with de-icing bypass. If there is a risk of icing, then a certain amount of outdoor air will bypass the heat exchanger and go directly to the after heating coil. This increases the demands on the after heating coil’s output. However, it avoids a costly preheating coil. The drawing below is an example of a de-icing situation, where 20% of outdoor air is directed through the bypass damper.

Heating coil and de-icing function:
The de-icing situation is shown above, a heating coil is included here. A coil is absolutely necessary, in order for the de-icing function to work correctly. Without the heating coil, the de-icing process will cause the temperature of the supply air to fall and sooner or later the VEX unit will stop because of icing.

The heat exchanger has two forms of frost protection: temperature-controlled or pressure-controlled. The actual de-icing can take place in several ways, depending on whether an after heating coil has been fitted.

Which method is used when?

Temperature-controlled frost protection T_ice

The control system has temperature-controlled frost protection as standard. It is an inexpensive solution and provides sufficient frost-protection in some situations.

A temperature sensor is fitted inside the heat exchanger and if the temperature falls to a pre-set value, de-icing begins. This temperature level is factory set to 0 °C but it can also be changed to a new value via the control system.

Temperature-controlled frost protection triggers the de-icing process even if there is no ice in the heat exchanger.

Pressure-controlled frost protection (requires accessories AFC and DEP)

The control system monitors the actual airflow and also the pressure drop across the heat exchanger. If ice forms in the heat exchanger, the pressure drop across the heat exchanger will increase and when it exceeds a pre-set value, de-icing begins.

Pressure-controlled frost protection only starts de-icing when ice has actually formed, regardless of whether there are sub-zero temperatures.

Capacity, VEX330H

Below illustrates which capacity ranges individual VEX sizes cover. To calculate the actual capacity data, use our product selection programs.

VEX330H

Cabinets
	Cabinets are made from Aluzinc® AZ185 class C4 in accordance with EN/ISO12944-2 and insulated with 50 mm mineral wool. This results in low noise emissions to the surrounding environment/installation room. The panel design minimises the formation of thermal bridges in the unit.

VEX300H Energy-efficient ventilation

The design of the unit has placed particular focus on smooth airflow through the unit in order to achieve the lowest possible pressure loss.

Counter flow heat exchanger
	The VEX330 counter flow heat exchanger is made of aluminium. It is designed to ensure the ratio of heat recovery and pressure loss is at an optimum, i.e. extremely high temperature efficiency is achieved at low levels of energy consumption. - Efficiency level without condensation: 80–85 % - Efficiency with condensation: Up to 94 % - Heat transfer area: 30.3 m2 - Weight: qty. 1 à 14.5 kg

EC motors
	The combination of modern EC motors  and an  optimised centrifugal impeller delivers extremely low energy consumption and greater output at the same time.

Energy labelling
	An energy label that states the energy class of the unit in relation to defined operating conditions is available via our product calculation programs.

VEX100/VEX100CF/VEX200/VEX300

Eurovent certification

All data provided with the VEX100/VEX100CF/VEX200/VEX300 model has been measured.

The units have completed a major test programme in our development department and all of the capacity, efficiency and sound data is collected via testing and in real operating situations.

	In accordance with EN1886 and EN13053, Eurovent has tested and certified that EXHAUSTO VEX units meet the following requirements and classes:
	Unit’s stiffness: Air tightness class at -400 Pa: Air tightness class at +700 Pa: Filter bypass leakage: Insulation class: Thermal bridge class:	D1(M) L1 (M) L1 (M) F9 T2 (M), U1≤1,0 TB3 (M)

This means that a third party has checked that the data that our product calculation program produces complies with the real performance of the unit. Eurovent checks the data by selecting a unit at random and testing that unit at their own facility. If our stated data complies with the Eurovent's test results, we retain our certification. This guarantees the customer that our data is valid.

VDI 6022 - German hygiene standard

EXHAUSTO has designed its units in accordance with the German hygiene standard VDI 6022.

VDI 6022 requirements
The unit's design must make cleaning easy. There may not be areas that cannot physically be cleaned and voids that are inaccessible must be sealed. Plates must be deburred to ensure edges are smooth and corners must be rounded to avoid the risk of injury when cleaning.

In addition,the condensation tray must decline to the outlet, so that water cannot remain in the unit. It is important that the condensation outlet is connected to the drainage system on a horizontal surface. All non-metallic materials (e.g. seals, filters), are tested to show that they do not promote growth of mould spores and bacteria.

Because the unit is designed in accordance with VDI 6022, it is both more hygienic and easier to clean.

Ecodesign - EU requirements for documentation, energy consumption and labelling of ventilation units.

General information We have made a compilation of extracts from the Ecodesign guidelines, read more about Ecodesigne here.

Ecodesign data

You will find links to Ecodesign data for the individual VEX sizes under the product name and in the Download section, where we have located Ecodesign data under EU/ECO declarations.

NB:

We would point out that the values stated in the declarations have been calculated for a specific operating point.

If a different operating point is desired, we refer to our calculation programs - here you can see whether the desired unit meets the requirements for your operating point and you will find the associated Ecodesign data.

VEX330H

The following cooling and heating coils are available with the VEX300H:

Water heating coils - HW

Uninsulated external water heating coils. Three sizes available. The selection is dependent on after heating requirements and allows the option for the low temperature operation of the heating coil.

More information about HW heating coils is found under Cooling and heating coils.

Electric heating coils - HE

Uninsulated external electric heating coil. Two sizes available. The selection is dependent on after heating requirements.

More information about the HE heating coils is found under Cooling and heating coils. 

Cooling coil/heating coil - DX

Uninsulated external coil that can be used both as an evaporator (cooling coil) and condenser (heating coil). Two sizes available.

More information about the DX coils is found under Cooling and heating coils 

VEX330H is available as a split version.

With some projects, limited space means that internal transport of the air handling unit is difficult or impossible. This is why the VEX330H is available as a split version. It means that the air handling unit can be assembled and tested at the factory as normal – just without sealant. The air handling unit can therefore be easily taken apart at the installation site, transported as single sections, assembled, sealed and commissioned.

The table below shows the dimensions of the largest section (counterflow heat exchanger) and largest cabinet section, so that it can easily be determined whether there is sufficient space to allow internal transport.

VEX330H

A wide range of accessories are available with the VEX300H

Closing damper - LS 

Closing damper with spring-return for indoor or outdoor fitting.

Base

A base with feet can be ordered.

Outdoor installation

The cabinet is insulated with 50 mm mineral wool. For outdoor installations, the unit is supplied with a cover that allows cables to be run under the cover on both sides, and at the back of the unit. We recommend the outdoor unit is fitted with additional support as described in the instructions.

 Water trap

EXHAUSTO also offers a water trap for the unit's condensation drain in dimension DN32. SIPHONUP (negative pressure) for connection to condensation outlet from the unit. SIPHONOP (overpressure) for connection to any cooling coil in the supply air duct. SIPHONHE02 (accessory) hot-wire is used to keep the water trap and water pipe free of ice. A thermostat is fitted to the hot wire to ensure low energy consumption.