3.8 Ductinstallation
3.8.1 Generalrecommendations
The connections for process and reactivation air are designed in accordance with the recommendations in
ISO 13351. The rectangular duct connections contain tapped inserts for M8 screws.
NOTE!
Thedehumidifierhasbeendesignedto operate atspecific processairflows(correspondingto thefan
sizes installed) andmustnotbedirectlyconnected toair-conditioningsystems.
When installing ductwork between the dehumidifier and the inlet and outlet connections, the following
recommendations should be observed:
■
The length of ductwork should be kept as short as possible to minimise static air pressure losses.
■
To maintain performance, all rigid process or reactivation air ductwork joints must be air and vapour
tight.
■
The process air ductwork must be insulated to prevent condensation developing on the outside of the
duct, whenever the temperature of the air within the duct falls below the dewpoint temperature of the
ambient air through which the ductwork is routed.
■
T he ducts must always be insulated when there is a risk of freezing.
■
The wet air leaving the dehumidifier will, because of high moisture content, condense on the inside duct
walls. By insulating the ducts, the amount of condensate is reduced.
■
Horizontal wet air ducts must be installed w ith a s light decline ( away from the dehumidifier) to drain
away possible condensation. Suitable condensation drains should be installed at low points in the wet air
outlet duct, see Figure 3.25 .
■
Ensure that access for operation and servicing is not restricted when des igning a nd installing ducting.
For more information, see section 7.3, Dimensions and service space.
■
To reduce noise and/or vibration being transmitted along rigid ducts, good quality, airtight flexible
connections can be fitted.
■
Ducts mounted directly onto the dehumidifier should be adequat ely supported to m inimise the load and
stress due to the weight and movement of the ducting.
■
Dampers for adjusting the airflows must be installed in the dry air outlet and reactivation air inlet ducts.
Correct airflows are essential for maintaining the operating efficiency of the unit. For airflow adjustment
details, see section 4.2, Airflow adjustment.
■
If the d ehumidifier is equipped with a frequency converter for the process air, see section
4.2, Airflow adjustment, the proces s air pressure and flow are adjusted using the process air fan's frequency
converter. In this case, there is no need for a damper in the dry air duct.
■
The total pressure drop in the process and reactivation ductwork must not exceed the available pressure
of the fans fitted to the dehumidifier. For details of minimum available static pressure, see section
7.4, Technic al data.
190TEN–106 5–J1408
Installation
19
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