Servicing Procedure - Major Component Parts - BENSON 30 Installation And Operating Manual

Quarterly Inspection
(a) Visual inspection of the burner
(b) Clean and check ionisation probes
(c) Check overheat safety is operational
Bi-Annual Inspection
(a) As per quarterly inspection, plus...
(b) Combustion check
Annual Inspection
(a) As per half year inspection, plus...
(b) Heat exchanger and cleaning
(c) Electrical connections
(d) Main fan motor
(e) Main fan assembly
(f) Pulleys
(g) Fan belts
(h) Gas supply
(i) Burner
(j) Air delivery system
(k) Flue
(l) Report
4.2 Servicing Procedure - Major Component
Parts
4.2.1 Flue
A visual inspection should be carried out to ensure that the
flue remains adequately supported, both internally as well as
externally, and that the various joints are effectively sealed.
Inspection covers, where fitted, should be removed and the
flue checked to see whether cleaning is require If inspection
covers are not fitted the flue gas exit duct and flue spigot will
provide not only an indication of the cleanliness of the flue,
but will also enable access for cleaning.
The presence of the flue terminal should be checked. If a
condensate trap and drain facility is fitted this should be
checked to ensure that it continues to function correctly, and
the drainage of condensates is not impaired.
4.2.2 Main Fan Motor
Remove access panel. Dust and other foreign matter should
be cleaned by blowing over with compressed air and through
the use of a soft bristle brush and cloth. Solvent wipes may be
used to remove heavy soiling from the motor casing.
Traces of surplus lubricants spreading from the bearings
should also be cleaned away.
Where motors are fitted with grease nipples bearings should
be lubricated with the correct grade of lubricant. Motors
Doc No. 20-45-159 Page 48 of 60
which do not have grease nipples feature sealed bearings
which are lubricated during manufacture for their life.
The electrical connections should be checked as follows.
(a) The cover to the terminal box should be removed by
undoing the screws which secure it.
(b) Check connections for signs of corrosion, tightness, and
ensure that there are no stray strands which could form a
short circuit.
(c Clean, tighten, and replace as necessary. Replace cover and
secure.
4.2.3 Main Fan
Remove dust and other foreign matter by blowing off with
compressed air or through the use of a soft bristle brush.
Check that the bearings do not show signs of excessive wear.
It should be noted that these bearings do not require
lubricating.
If the bearings require replacing the following procedure
should be followed.
(a) Remove belt(s).
(b) Loosen set screw on eccentric collar and tap collar in the
opposite direction to fan rotation.
(c) Remove collar and bearing.
(d) Check shaft for alignment and straightness.
(e) Locate the bearing in its seat and place on the shaft with
the cam facing outwards.
(f) Fit the eccentric collar and engage the cams.
(g) Tighten initially by rotating, and then by tapping in the
direction of the fan rotation.
(h) Replace fasteners and secure.
(i) Turn by hand to ensure free fan rotation.
4.2.4 Pulleys
Check pulleys for alignment using a straight edge, if necessary
reposition either or both of the pulleys and the fan motor.
Check for excessive wear within the root and sides of the
grooves, and check for any other signs of wear or damage, if
necessary replace the pulley as follows.
(a) Release tension on belts and remove.
(b) Release the taper locks by slackening the securing screws
by several complete turns.
(c) Fully remove one screw from the taper lock, and having
oiled it, insert into the threaded jacking point.
(d) Tighten screw until the taperlock is free.
(e) Remove taperlock and pulley.
(f) Fit taperlock in new pulley, and provisionally position on
the shaft.
(g) Remove the screw from the jacking point, and tighten both
screws in their clamping points until the pulley can just be
moved on the shaft by hand.