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TF6746_A_NOT_DXA230_REFERENCE
Aereco S.A.
3.3. DEFROSTING (OPTIONAL)
The defrosting is located in the duct that serves the fresh air inlet, upstream from the DXA Unit. It is
therefore in Ø160 mm and insulated.
A minimum length of 1 m must be respected between the
DXA Unit and the defrosting. The fresh air supply air duct must be manufactured from non-
flammable materials (A1 Class according to EN 13501-1).
The air must travel in the direction shown by the arrows marked on the defrosting device.
325
250
Ø160 mm
View of the defrosting
Positioning of the defrosting compared to the
DXA Unit
L > 1 m
The defrosting must be located at a distance of at least twice the connection diameter from a duct
bend or external grille, and at 1m minimum length from the DXA Unit. We recommend tilting the
duct slightly towards the exterior in order to keep rain water from getting into the defrosting.
The installation must allow access to the defrosting for a manual reset, or for maintenance
(access hatch).
Manual reset of the defrosting:
1. Unscrew the black cap
2. Push the red button and screw back the
black cap on
The defrosting must not be installed with the
electrical device at the bottom.
Note:
·The DXA Unit has been specially designed to work with the defrosting provided by Aereco (defrost
strategy specific to DX System, and adapted diameter). Besides, it has been CEM certified with the
DXA Unit.
·Using another defrosting can lead to serious problems of functioning and degrade the security of
the system.
Anti-frost without pre-heating resistance
·When using the DXA Unit without the additional resistance pre-heating, the anti-frost strategy is
based on the supply airflow regulation. The supply air fan is switched off and the extract air fan
remains active, in order to warm up the heat exchanger.
Be careful, very often, this type of strategy does not comply with an open fireplace.
Make
sure that you comply with the standard in force in the country of installation.
When the optional defrosting device is used, this anti-frost strategy is not active anymore.
A 1200W preheater allows to warm 200 m
3
/h @ -20°C. If T° can fall down bellow -20°C,
2 x 1200W preheaters may be implemented on the same supply duct network. These 2
preheaters can be driven with only one 2I2O module. In this situation, the amount power of
the 2 preheaters is 2400W, so this value has to be entered in the manufacturer access web
page (MAINTENANCE / MANUFACTURER ACCESS / Preheater power).
