2.8 Protection against contact
- Silentboxes SB.. are not delivered with fan protection guards as standard. Depending on the installation
conditions, protection against contact may be necessary on the suction and/or discharge side. Corresponding
protection guards are available as accessories.
- Fans which are protected by their installation method (e.g. installation in ventilation ducts or closed assemblies) do
not require protection guards if the plant provides the necessary level of safety. Please note that the operator is
responsible for complying with the current standard and can be held liable for accidents as a consequence of missing
protection systems.
2.9 Motor protection
All Silentbox fans have thermal contacts (TC) fitted in the motor windings. These protect the motor against overloading.
Triggered thermal contacts indicate incorrect operating conditions, the cause of which must be remedied.
With regard to unit types SB 125 to 250, the TC are connected in series with the winding. In case of thermal overloa-
ding, deactivate the motor. The restart takes place after cooling by switching the power switch on and off.
With regard to unit types SB / SBD 315 to 400, the TC are fed to the terminal block in the terminal box and connected
to a motor protection device (see accessories).
NOTE!
Triggered thermal contacts indicate incorrect operating conditions, the cause of which must be addressed.
If the thermal contacts are triggered frequently (standstill), the fan must be inspected by a specialist according
to chapter 1.4.
2.10 Condensation
If the fan is used intermittently, especially in a humid and warm environment, or if variations in temperature occur, con-
densation may build up in the motor and draining off must be ensured. In case of condensation in the ducting and fan
casing appropriate measures must be taken during installation (water sack, drainage line). Under no circumstances
must the motor come into contact with water.
3.0 SilentBox SB ... type overview (dimensions and weights)
UK
4
Centrifugal Fan Boxes – SilentBox
®
SB ...
Installation and Operating Instructions
SB 250 C Ref. no. 9512
SB 250 E Ref. no. 9565
Dimensions in mm
Dimensions in mm
SBD 315 B Ref. no. 9583
SB 315 Ref. no. 9515
SBD 315 A Ref. no. 9718
SB 125 A Ref. no. 9506
SB 125 C Ref. no. 9562
Dimensions in mm
SB 160 B Ref. no. 9508
SB 160 D Ref. no. 9563
SB 200 C Ref. no. 9510
SB 200 D Ref. no. 9564
Dimensions in mm
Dimensions in mm
Dimensions in mm
CHAPTER 3
TECHINCAL DATA
SB 355 Ref. no. 6158
Dimensions in mm
SBD 355 Ref. no. 9969
Dimensions in mm
Dimensions in mm
SB 400 Ref. no. 6159
NOTE
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