Doc No. 20-45-159 Page 49 of 60
(h) Align pulleys using a straight edge, and by gradual alter-
nate tightening of the screws clamp in position.
(i) Ret belts and check for the correct amount of tension.
4.2.5 Fan Belts
Check belts for signs of wear.
Frayed or split belts must be replaced using belts with a
common batch code.
Belt tension must be checked, and if on multi-belt units it is
found that one belt contains more slack than its
accompanying belts, then all the belts on the unit must be
replaced, again using a common batch code.
Replacement and tensioning is carried out as follows.
Note:
The maximum displacement at the mid point of the top edge
of the belt must not be greater than 16mm per metre of span,
when a force of 3kg is applied in a plane perpendicular to the
belt.
(a) Loosen fan motor securing bolts on chassis.
(b) Loosen fan motor slide adjustment bolt.
(c) Slide fan motor towards fan to slacken belts.
(d) Replace belts, pull fan motor away from fan until belts are
tight.
(e) Tighten adjustment bolt to hold motor.
(f) Tighten fan securing bolts ensuring that the fan is square
and the pulleys aligned.
(g) Check belt tension, making nal adjustments as necessary.
(h) Tighten and clamp fasteners to hold fan motor in position.
4.2.6 Heat Exchanger
The heat exchanger requires a visual inspection at least once
per year, this should be accompanied by cleaning.
It is recommended that a ue brush and vacuum cleaner be
used to facilitate this.
Access to the heat exchanger is gained through the removal of
the rear upper panel and heat shield.
Servicing and cleaning should be performed as follows:
(a) Remove brass nuts and cover from heat exchanger end
assembly to expose heat exchanger tubes.
(b) Remove any accumulated deposits from the tubes.
(c) Particular attention should be paid to the upper internal
surfaces of the tubes, where through convection heavier
deposition is likely to occur.
(d) Any deposits which may have accumulated within the
combustion chamber can be removed with a vacuum cleaner
once the burner is removed.
Note:
It is most important that a build up of deposits is not allowed
to occur as this can have an adverse eect upon the eciency
of the heater and reduce the life of the heat exchanger.
(e) The heat exchanger and combustion chamber should be
visually inspected for signs of splits, cracks, and distortion.
(f) All gaskets should be checked to ensure that they continue
to provide a gas tight seal, if there is an element of doubt then
they should be replaced.
If the condition of the heat exchanger gives cause for concern
the suppliers Service Department should be advised pending
a more detailed examination. Details on rear page
4.2.7 Electrical Supply
All connections must be checked to ensure that they are
secure, and free from corrosion.
Terminals and connections should also be checked to ensure
that no stray strands are bridging terminals.
Electrical continuity should also be checked.
4.2.8 Gas Supply
The gas supply pipework, and ttings should all be inspected
to ensure that they are free from corrosion, and to ensure that
where brackets have been tted these remain secure and oer
adequate support.
The system should be soundness tested in accordance with
Institute of Gas Engineers recommendations detailed in UP-1
& UP-2.
Warning
Any waste oil or sludge must be disposed of correctly. Never
dispose of it by dumping or tipping it down drains or into
watercourses where ground water can become polluted and
environmental damage caused.
4.2.9 Burner
Service requirements for the burner tted to the cabinet
heater are covered in the separate manual prepared by the
burner manufacturer.
Note:
It is most important that the burner is serviced regularly and
in accordance with the manufacturers instructions.
4.2.10 Air Delivery System
A visual inspection should be undertaken to ensure that the
air delivery system is in good order, that it remains adequately
supported and that the various joints are eectively sealed.
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