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Installation and Operating Instructions
CHAPTER 4
FUNCTION
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NOTE
CHAPTER 5
USER MAINTENANCE
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CAUTION
SilentBox® SB EC . . . EC Centrifugal Fan Boxes
3 .2
Accessories
The use of accessories not offered or recommended by Helios is not permitted. Any potential damage is not covered
by warranty.
Flexible mounting clamp
Outside wall cover flap
Outside wall cover grille
Backdraught shutter
Differential pressure/temperature controller
Flexible sound attenuator
Air filter cassette G4
Air filter cassette F7
Speed potentiometer
Three-step switch
Universal control system
Electric heater battery
– with integrated temp . control
Temp . control system for electric heating battery EHR-R EHS
Warm water heater battery
Temp . control system for warm water heater battery
Duct system:
All Helios components fit standard duct Ø. For example, rigid spiral ducts, flexible aluminium or plastic ducts can be
used. The relevant fire-protection regulations must be observed if more than two stories of a building are connected.
4 .0
Functional description SilentBox SB EC..
The scope of delivery includes an internal potentiometer in the terminal box with which any fan speed between min. and
max. speed can be set. For speed control, the internal potentiometer can be set to the desired speed setpoint. For an
external speed setting with a 0-10 V control signal, the internal potentiometer must be removed. The SilentBox SB EC..
fans are variable speed controllable by means of a 0-10 V control voltage. Suitable potentio-
meters (Type PU/A 10; SS-980), three-step switches (Type SU/A) are available in the Helios accessory
range. Variable speed control is possible with a universal control system (Type EUR EC; SS-981). Alternatively,
the electronic differential pressure/temperature controller EDR / ETR can be used.
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Activation / deactivation:
Frequent switching on and off of EC fans can be carried out via the 0-10 V control input by switching off
the control signal to 0 V . This applies to operation with an external potentiometer or external 0-10 V signal
from the building management system . Switching off is alternatively also possible via a release input,
depending on the type . This is gentle on the electronics and ensures a long service life . If this is not easy to
realise, e .g . when operating with an internal potentiometer, it can also be done by switching off the mains
supply . In general, a time interval of at least 120 seconds must be observed when switching the mains off/
on .
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In case of strong vibrations and/or odours, maintenance must be carried out by a specialist according to
chapter 1 .4 .
5 .0
Opening the casing
CAUTION!
Risk of injury when opening the casing due to the hinged/removeable motor impeller unit!
Do not stand in swing-out/opening area!
SB EC 125 . . - SB EC 160 . .
1 . Disconnect the unit from the power supply and secure it against switching on again!
2. Loosen snap locks and remove cover (Fig. 2).
3. Then loosen the fixing screws on the motor bedplate and swing out motor impeller (type-dependent) (Fig.4).
Fig .2
FM . .
VK . .
G . ./RAG
RSKK . .
EDR/ETR
FSD . .
LFBR . .G4
LFBR . .F7
PU/A 10
SU/A
EUR EC
EHR-R . .
EHR-R . .TR
WHR
WHST . ./WHS . .HE
Fig .3
Fig .4
Hinged
motor impeller unit
5
EN
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