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(b) Clean and check positions of
ionisation and ignition probes.
(c) Check airways for any obstructions.
(d) Check ionisation and ignition probes
for wear or burning. Replace if
necessary.
(e) Clean the blades of the burner fan
impeller with a stiff brush to remove
any dust.
(f)
Check settings of pressure switches.
(g) Inspect condition of sequence
controller and ensure the blade
terminals are clean and tight.
(h) Fit new gasket to burner and replace
to combustion chamber.
Refer to burner manual for any other
specific instruction.
Main fan and motor
Remove the access panels to the fan
section and clean by removing any foreign
matter and dust with a vacuum cleaner or
compressed air. The blades of the fan
impeller should also be cleaned free of
dust and dirt by means of a stiff brush and
a vacuum cleaner.
The following inspection routine should be
carried out:-
(a) Check the fan bearing resilient
mounts for signs of distortion or
excessive wear.
Change for new rubber mountings if
required.
(b) Check bearings for any signs of
excessive play in the housing.
Replace if required.
(c) Check the shaft for alignment,
straightness and rusting. Realign,
replace or oil where necessary.
(d) Check the bearings locking collars for
correct fitting and tightness.
(e) Check all screws and nuts holding
the fan and motor for tightness.
(f)
For indirect drive systems check that
the locking nut on the adjustment bolt
is securely fastened.
Pulleys and Belts
Using a straight edge check that the fan
and motor pulleys are in line and are as
close to the bearings as possible. If
necessary adjust the position of the pulleys
to achieve this.
Check the condition of the belts for splits
or fraying; if one belt in any set appears to
have worn excessively then change the
whole set immediately.
DO NOT MIX
BELTS OF DIFFERENT AGES OR
BATCHES
. As the belts stretch at a
different rate according the batch curing
number and age, premature failure could
occur if they are mixed.
Ensure that the belts are correctly
tensioned.
This can be confirmed when the mid point of
the belt is displaced to a maximum of a6mm
when a force of 3kg is applied in a plane
perpendicular to the belt.
Check the pulleys for signs of wear in the
grooves and replace where required, also
ensure the keys.
Flue connection
Remove the flue elbow or T-piece with drip
pan. Inspect for signs of wear or leakage.
Repair or replace where necessary.
Using a vacuum cleaner clean out any
deposits remaining when the heat exchanger
tubes were cleaned.
Replace elbow (or T-piece with drip pan)
guard & nuts and ensure of the correct
installation.
Inspect the flue and terminal for water ingress,
if any found reseal where necessary.
Control Panel and Electrical Connections
Check all electrical connections to ensure they
are tight and free from corrosion. Any
connections that have signs of loose strands
that may come into contact with adjacent
terminals should be removed and a new
connection made.
Check the operation and correct functioning of
the control panel. Ensure the settings are in
accordance with the end users requirement.
Gas Supply Connections
Inspect the supply pipes and joints for any
signs of wear and corrosion. Ensure any
support brackets are secure and correctly
adjusted. Any suspect joints should be
checked for soundness in accordance with the
appropriate standard.
6.3
Re-Commissioning
On completion of the service work the heater
and burner are to be re-commissioned in
accordance with the manual section 6.2.
A record of the service work carried out, any
recommendations and commissioning details
are to be completed as a report and issued to
the end user.
