Air conditioning unit with cross-counterflow heat exchanger for private swimming pool halls

Devices of the series 19 and 29 dehumidify and heat the swimming pool hall and they reduce a possible concentration of harmful substances in the air. The devices are multifunctional compact systems with integrated control and regulation. ThermoCond 19 is suitable for swimming halls with lower heating requirements. ThermoCond 29 is equipped with an integrated heat pump. This increases the overall efficiency of the system and enables the dehumidification of the pool hall air in recirculation mode. The design ensures the cleanability according to VDI 6022.

Further performance parameters and options:

  • Filtering the air in any operating mode
  • pumped hot water air heater
  • sound-optimised plastic impellers for even quieter operation (from 19 20 01)
  • Individually controllable performance parameters
  • Complete unit, ready to connect, contains all structural elements for air conditioning swimming pool hall air, including all control and regulation fittings
  • Intensive quality inspection with factory test run


  • bypass damper
  • water/air temperature interconnection
  • design complies with VDI 6022
  • Pool water condenser (ThermoCond 29)
  • Domestic heat pump coupling (ThermoCond 29)
  • remote maintenance
  • and many more

At a glance:

  • Dehumidifies, ventilates and heats
  • Corrosion-free heat exchanger made from polypropylene
  • Two-stage recuperative heat recovery
  • Energy-saving EC fans
  • Integrated heat pump (ThermoCond 29)
  • Constantly regulated recirculation air heating damper
  • Variable air duct connections
  • Compact design for minimal space requirements
  • Integrated control and regulation system, compatible with all conventional building management systems
  • Optional: operation via smartphone or tablet

Functional description

Recirculating Air Operation (heating)

If no requirements are placed on temperature regulation or dehumidification when the device is in standby mode, the system operates only in recirculation mode with reduced air volume flow. The air circulation in the swimming pool hall is guaranteed. If heating is required, the return air is heated up using the heating coil to achieve the supply air temperature set-point.

Dehumidification using outside air in winter

A large proportion of the sensitive and latent heat is recovered from the return air, and is transferred to the supply air in the cross-counterflow heat exchanger and evaporator. If the heat output of the heat pump is not sufficient, the supply air will be reheated using the heating coil. Excess heat can be transferred to the optionally available pool water condenser for heating the pool water.

Recirculating air dehumidification

The air is dehumidified in the evaporator of the heat pump, this process is boosted by the pre-cooling effect in the heat exchanger. The air that has already cooled down and been dried is preheated in the heat exchanger by the return air from the swimming pool hall. On the other side of the heat exchanger, the transmission of heat produces a precooling effect, lowering the temperature of the drawn-in humid and warm air from the swimming pool hall near to its dew point. The preheated, dehumidified air is then mixed with a proportion of untreated recirculation air, is reheated at the condenser of the heat pump using the heat extracted during the dehumidification process, and is returned to the swimming pool hall as supply air. The heat pump is optimally designed, with a dehumidification energy requirement < 0.25 kWh/kg. If required, the supply air will be reheated using the heating coil.

Dehumidification using outside air in summer

In case of rising outside air humidity, the recirculation air damper is continuously closing as required. When the outside air humidity is high, the damper closes completely. The system works at 100% outside air / exhaust air operation through the heat exchanger.

Domestic heat pump operation

An existing domestic heat pump can be used for energy-efficient heating of the swimming pool hall air. The domestic heat pump is connected to the heating coil. Typically, the low flow temperatures of the domestic heat pump are not sufficient for heating the swimming pool hall air – the heating coil is therefore installed upstream of the air condenser of the integrated heat pump. The domestic heat pump can so be operated with an optimal COP without a change in the low flow temperatures. In combination, the two systems heat the supply air to the desired temperature level.


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