As-new Kampmann WZA decentralised ventilation unit for schools, offices, laboratories, etc.
The unit was installed in 2023 and taken out of service in mid-2024 because the operating company had to close down.
Probably the biggest advantage of the new Kampmann product is that it is a ‘plug-and-play’ solution. No electrician is required to install the compact WZA school ventilation unit; it is ready for use immediately after installation. All air deflectors with shut-off dampers are also pre-wired at the factory. This is a significant difference to many other models on the market. The external dimensions of the unit are small at 150 (W) x 66 (D) x 210 (H) cm. The range also includes various colour options, allowing it to be individually adapted to the respective interior design. A CO2 sensor and corresponding air volume design guarantee compliance with current standards and comfortable operation.
Safety is a top priority here: the school ventilation unit can be connected to an existing fire alarm system.
The unit weighs a total of approx. 400 kg and consists of two parts: a lower heat recovery unit and an upper functional part with all electrical components and an external air filter. The two-part design makes delivery and installation easy, including the additional cladding supplied.
Operation and ongoing use
The decentralised WZA ventilation unit has four settings plus standby, which can be switched through using a single button with colour signals:
Standby
- Unit is off
- If the CO2 content in the classroom exceeds 600 ppm, the unit automatically switches to automatic ventilation
White – Automatic ventilation
- For everyday operation
- Automatic and continuous regulation of the air volume depending on the CO2 content in the classroom
- The unit automatically switches to standby when the CO2 content is below 500 ppm for at least 2 hours and good air quality is thus restored
Blue – Intensive ventilation
- The device delivers full air output (over 1,000 m³/h) for 10 minutes, after which it automatically switches to automatic ventilation
- Corresponds to the function of shock ventilation and can be used, for example, during breaks or in the event of a pandemic or flu epidemic
- No other product on the market offers this high air output
Magenta – Level 1
- The device continuously delivers an air volume of 800 m³/h for 8 hours, regardless of the ventilation requirement based on the CO2 content in the classroom.
- This function serves to protect against infection, as is necessary during pandemics or flu seasons, ensuring that there is always sufficient air exchange.
- After 8 hours, the device automatically switches back to automatic ventilation.
Turquoise – Level 2
- Reduced operation at a low level
- Suitable for exam situations, for example
The one-button operation allows the user to operate the device intuitively and easily. If individual adjustment to the respective usage situation is desired, all running times and values can be parameterised retrospectively via the web interface. A key feature of the school ventilation unit is its low noise level, thanks to the sophisticated insulation panels in the base unit and housing. These ensure quiet operation.
The air flow rate of the decentralised ventilation unit WZA meets the requirements for BAFA funding
As part of the subsidy for the new installation of a stationary air handling unit, a nominal volume flow of at least 25 m³ per person per hour is prescribed, with a minimum of 30 m³ recommended. The WZA exceeds these requirements.
The continuous ventilation mode delivers 800 m³/h.
With 30 pupils in nominal air mode, 750 m³/h would be necessary: 30 x 25 m³/h = 750 m³/h
In intermittent ventilation mode, the unit achieves an air flow rate of 1,000 m³/h, which exceeds the required air volume: 30 x 30 m³/h = 900 m³/h.
Of course, these values would also be achieved in automatic mode with self-regulating CO2 sensor control if required.
Easy maintenance
The design of the WZA decentralised ventilation unit is functional and therefore easy to maintain. In most cases, maintenance can be carried out by trained in-house staff, who can easily read any error messages. This means that there is no need to call in specialist tradesmen.
The design of the upper part of the unit is well thought out, allowing the fan to be easily pulled out via a ‘drawer’ for inspection purposes. The outside air filter is also easily accessible and can be replaced without any effort.
Under normal conditions and at operating temperatures down to -10 °C outside, flawless operation is guaranteed, thanks in part to the installation of a frost-proof enthalpy exchanger. As no condensate accumulates in the unit, no connection to a sewage system is required. There is also no condensate pump.
Another important aspect for use in schools has been taken into account: the housing. It is accident-proof, robust and therefore hardly susceptible to vandalism.
No drying out of the mucous membranes thanks to enthalpy exchanger
The enthalpy exchanger installed in the school ventilation unit ensures that a large part of the room humidity and heat or cold can be recovered from the exhaust air. This prevents energy losses and reduces humidity. This has ecological and economic advantages. However, the health aspect for the people in the room is also very important. Especially in winter, rooms are not sufficiently humid due to dry heating air. This leads to dry mucous membranes, which have been proven to promote infection. These quality features clearly distinguish the Kampmann unit from other decentralised ventilation units on the market.
