8
12. Fault Finding
For other symptoms not listed, please refer to BSB Technical Sales Office
Symptom
Fault
Corrective Action
Damper does not travel
fully open / close smoothly
or has become stuck
Internal foreign object
fouling blade
Inspect / remove items
Clean and lubricate. (Refer to 11.3/11.4)
Casing dented/damaged or
not round
Minor damage may be corrected carefully with a soft mallet. (
BSB
always recommend replacement of damaged dampers)
Damper internals have
been exposed to moisture
Gently apply pressure to blade by hand to move open. Use
Scotch Bright pad RED 07447 grade, wet with duck oil and clean the
damper internally at the point where the blade closes. Wipe dry and leave
clean. ‘Massage’ exposed peripheral blade seal until pliable.
Damper not in expected
‘normal’ state
Fusible link (FL) missing
Fit Fusible Link (FL)
– Part No: 201448.
Fusible link (FL) not
tightened properly
Tighten Fusible Link (FL)
Fusible Link (FL) has
activated
Measure Fusible Link (FL) overall length, which is normally 29.5mm. If
less than 28mm, replace with new link
– Part No: 201448.
Fusible Link
Mechanism too sensitive
Fusible Link Mechanism
too sensitive
Fusible Link (FL) has
activated
Measure Fusible Link overall length, which is normally 29.5mm. If less
than 28mm, replace with new link
– Part No: 201448.
Damper case damaged/not
round
Check roundness. Reshape if minor adjustment needed.
(BSB always recommend replacement of damaged dampers).
Circlip on the handle
lost/damaged
Contact BSB Tech Sales.
Releases prematurely
Refer to 3.3.
Not possible to set
damper to open position.
Fusible Link (FL) has
activated
Measure FL overall length, which is normally 29.5mm. If less than
28mm, replace with new link.
