en
│ 3. Product information
14
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Speed controllable.
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High pressure capacity and air volumes.
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The unit is switched on or off with a switch
to be provided by the customer.
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Centrifugal impeller with backwards
curved blades.
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Single-phase AC model, with a capacitor
motor (operating capacitor ready for
connection in the terminal box).
Thermal overload protection
EHD 10, EHD 12, EHD 15, EHD 16, EHD 20,
EHD 25, EHD 31 (AC-variant)
Not for EC-variants.
The fan motor has thermal protection
(temperature sensor in the motor winding).
The overload protection automatically
switches the fan off in the event of
overheating.
The fan must remain switched off long
enough for the motor and temperature limiter
to cool down, before starting the fan back up.
Depending on size and temperature
conditions, it may take
up to 30 minutes
to
cool down. Only switch unit on after this.
3.3 Intended use
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EHD .. are duct fans for domestic and
light-duty commercial use.
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These fans are designed for air extraction
of greenhouses, garages, portacabins,
forman's offices, hothouses etc.
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They may be used on roofs (flat, inclined,
corrugated or trapezoidal roofs), ceilings
or brackets with sufficient load-bearing
capacity.
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A permanent installation with permanent
electrical supply cable is compulsory.
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With roof socket [10] only on suitable
base.
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Without roof socket [10] directly on the
air extraction pipe.
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Installation positions of up to an angle of
maximum 90° are permissible.
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If connecting to piping, folded spiral-seams
ducts with flexible couplings are specified.
These prevent the transmission of vibra-
tions to the duct system.
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With a free inlet, operation is only per-
mitted with protection against accidental
contact according to EN ISO 13857, for
example with a Maico protective
grille SGR.
3.4 Foreseeable misuse
Maico is not liable for damages caused by
use contrary to the intended purpose.
Under no circumstances should the unit
be used:
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for conveying steam-saturated air or
greasy air.
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in conjunction with an range hood.
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for conveying solid particles which may
stick to the fan.
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close to flammable materials, liquids or
gases.
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to convey chemicals, aggressive gases
or vapours.
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in explosive atmospheres.
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with a free inlet, if there is no protection
against accidental contact with the
impeller in accordance with EN ISO
13857.
4. Environmental conditions and
operating limits
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Permissible maximum air temperature
+ 40 to + 70 °C, according to unit type.
EHD .. EC - 20°C bis + 60°C, according to
unit type.
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Sufficient supply air intake must be
ensured during operation with air-
ventilated fireplaces. The maximum
permitted pressure difference per living
unit is 4 Pa.
