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9 - SYSTEM START-UP
9.8 - Damper and mixing
9.8.1 - Condensate drain
■ In the mixing box:
- Check the cleanliness of the drain pan
- Fill the drain trap.
- Check that the condensate is draining correctly
9.8.2 - System start-up
Warning!
Follow the safety instructions (see § 2 - SAFETY INSTRUCTIONS).
■ Damper:
- Make sure the dampers are in the open position before starting up the fans.
- Make sure the damper casing is clean and free from foreign objects. If necessary, remove any impurities using a vacuum cleaner
and/or cleaning product.
The sharp increase in the air pressure when the fire damper is closed may cause irreversible damage to the blades.
For double flow units with fans on each side of a rotary wheel exchanger, and with optional mixing damper : installer
shall take care about differential pressure on each side of the mixing damper, to ensure that the airflows comply with
the product selection. A too high pressure difference could generates an inappropriate control, and / or issue in
controlling the unit, and / or could lead to an impossibility to get the airflows indicated in the product selection
datasheet, and / or to have an air recycling in the wrong direction (from fresh air to exhaust air)
■ Servomotors:
- Actuate the servomotors in the fully closed position. Make sure the dampers are fully closed and that the blades are perfectly
joined.
- Check the damper's direction of rotation (servomotor uncoupled) and correct if necessary.
- Retighten the servomotor coupling.
- If necessary, set the blades to fully closed and adjust the end of travel.
- Actuate the servomotors in the fully open position. Make sure that the blades are parallel to the air flow direction.
- If necessary, set the blades to fully open and adjust the end of travel.
- If the blades are not visible, a groove on the shaft of the dampers and extensions can be used to locate the open and closed
positions of the dampers.
AHUs for ATEX zones must only be equipped with suitable servomotors. Electrical equipment must be grounded + alu. blades
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