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7 - CONNECTIONS
7.11 - Heat recovery units
Recommendation: Whether plate or rotary heat exchangers are used, air filtration is recommended to prevent premature fouling.
7.11.1 - Plate heat exchangers
■ Condensate draining connection
- Refer to your dimensional drawing for the diameters of the connections and their positions.
- Outlet on the front frame: threaded gas type steel connector.
- Fitting the siphon (see § 7.1 "Condensate drainage siphons").
■ Electrical connection of the bypass damper servomotors
- See dampers section (see § 7.8 Damper).
To prevent the risk of freezing and ice in the heat exchanger, fit pressure or temperature sensors.
7.11.2 - Rotary heat exchangers
To carry out maintenance on the recovery wheel, it must be possible to remove it completely from the AHU (e.g. to
change a rotor bearing). It is therefore essential to leave sufficient free space for this during installation. For a VDI
6022 certified AHU, heat recovery units with leaks are considered to be recirculation units unless a sufficient, verified
pressure differential is guaranteed in the heat recovery unit compared to the outdoor air. The transfer of harmful
substances caused by rotation or tipping of the components must also be monitored.
If such transfer cannot be avoided, the use of these heat recovery units must only be authorised if air recirculation
inside the system complies with the required hygiene level
- Handling operations must be carried out by qualified personnel.
- For certain sizes, the rotary heat exchanger comprises a self-contained block. This block is supplied resting on its rear surface.
- Stand the module upright using the two installed lifting lugs.
- Lift the module. Only use the lifting lugs affixed to the frame.
- Before affixing the unit's other blocks, remove the lifting lugs.
- During handling, when the heat exchanger is positioned upright, always check that it is properly supported to prevent it from
falling.
- Never leave it standing and unsecured to the ground, as it could be blown over.
■ Condensate draining connection:
- Refer to your dimensional drawing for the diameters of the connections and their positions,
- Outlet on front frame: for Ø 32 mm tube,
- Fitting the siphon (see § 7.1 "Condensate drainage siphons").
■ Electrical connection:
- For machines supplied without a control unit:
- When selecting the cables, take into account the routing, the ambient operating temperature and the current of the connected
motor(s). (see table below)
- The selection, securing and mechanical and electrical protection of cables must conform to the regulations and laws at the
installation site. Follow the recommendations in the regulations section when selecting components and cables.
Feet
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