DHAD

DHAE... / DHAD... - Centrifugal fans double inlet with backward curved centrifugal impellers


·    Casing made of galvanized sheet steel
·    outgoing connection cable
·    motor protection by termal contacts
·    speed is variable using auto transformers

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Description:

The high efficiency centrifugal fans with backward curved impellers have been developed especially for modern  ventilation and air conditioning applications and are ideal for the movement of air and slightly aggressive gas and vapours. The sizes comply with standard R20 according to DIN 323. The designation of sizes corresponds to the outside diameter of the impeller.


Application areas:
Railway  / Wind power /  Ex-protection /   Datacenters /   Inflatables /   Compressors /  Ships /  Offshore /  Laboratories / Retail stores / Industrial buildings / Basement rooms / Workshops

Reference to Directives:
 Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE identification in accordance to EMC-Directive 2014/30/EU, Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/125/EC.

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Casing:

The casing of the high efficiency centrifugal fans is made of galvanized sheet steel.  The  side parts of the scroll are assembled with the spirally shaped guide plate through a standing seam. The side parts are produced with holes to fix the mounting brackets, which can be fixed in steps of 90°.

Note:
From size 450 the units are supplied in rectangular sheet metal construction.

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Impellers:

The impellers are balanced together with the external rotor motors at two levels according to quality level G2.5 to DIN 1940.

Backward curved centrifugal impellers in double inlet variant made of aluminium.

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Motor and motor protection:

All Rosenberg fans are equipped with direct driven external rotor motors. All our fans have motor protection through thermal contacts in the motor windings as standard. The motors apply to protection class IP44/IP54.


The drive has due to an external rotor motor a space saving, compact and attractive design. The motor is  fitted within the impeller,  which  enables the best possible cooling. For this reason a 100% variable speed  control can be guaranteed. V-belts, additional tension bars and motor mounting devices are not necessary.  Only  well-dimensions  ball-bearings,  fitted  on  both sides and life time greased are used.
Both  ball-bearing  seats  are  ground to high precision in one work process to eliminate any vibrations.
External rotor motors have extremely low starting current. The windings comply to isolation class F.
In addition the windings have a standard moisture impregnation.

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Electrical connection:

The motors are fitted with an outgoing cable. The electrical connection can be made via an IP44 terminal box, which is supplied loose.

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Installation:

Direction of rotation:
Direction of rotation for the fan types DHAE and DHAD is clockwise viewed from the inlet side.

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Air volume control:
For more information see accessories!

5-speed control:
230V   à  RTE
400V   à  RTD

Stepless control:
230V   à  not possible
400V   à  RED

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Scope of delivery:

  Centrifugal fan (DHAE / DHAD)
  Terminal box (loose)
  Documentation

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Important notes:

Air performance curves:
The performance curves for these fan types have been measured in mounting position B (installed on the pressure side and open on the suction side) and show the total pressure increase ∆pt as a function of the air flow.  The dynamic pressure ∆pd2 refers to the flange cross section at the outlet side of the fan.

Noise levels:
The  bordered  values  printed  in the performance curve diagrams show the "A" weigthed LWA6 sound power level (fan outlet). Determination of "A" weigthed LWA5 sound power level at fan inlet:
LWA5 [dB(A)] = LWA6 [dB(A)] - 6 dB
The "A" weighted sound pressure level LPA at a distance of 1 metre is calculated approximately by  deducting 7 db(A) from the "A" weighted sound power level. It is importmant to note that the reflection and room characteristic as well as natural  frequencies  influence  the sound pressure levels a different way.  The octave sound power level LWA at octave medium frequency you can find on the table on each fan type page.

Technical data presentation:
The performance data shown represent the accuracy class 3 according to DIN 24166.

Classification of the fan series:
NRVU    = Non Residential Ventilation Units
UVU    = Unidirectional Ventilation Units

Erp-Information:
Rosenberg fans have a spezfic (pressure-) ratio < 1,05 (pressure < 5000 Pa).

Service life:
For maximum service life of Rosenberg products please beware of the maintenance hints on the manual for each
product type.

Recycling and disposal:
For recycling and disposal of Rosenberg products comply with applicable locally requirements and regulations.

Centrifugal fans double inlet with backward curved impellers

Double inlet casings, made from galvanized steel, rectangular form. Impellers with backward curved blades made from seawater-resistant aluminium, mounted onto the rotor of a speed controllable external rotor motor. The fan is balanced on two levels according to quality level G 2.5, DIN/ISO 1940.

Closed motor, protection class IP 44/54 with protection against humidity and thermal contacts wired in motor windings for motor protection. Maintenance free ball bear­ings, closed on both sides, sealed for life. Electrical connection through external ter­minal box in IP 44.

Reference to Directives:
Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE identification in accordance to EMC-Directive 2014/30/EU, Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/125/EC.

For further information, please click the model below for detail.

DHAD 355-4.5FA
DHAD 400-4.5LA
DHAD 450-4.6IA
DHAD 500-4.6SA
DHAD 560-4.7ZA

Picture of Centrifugal fans DHAD