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SERVICING INSTRUCTIONS
IMPORTANT:
Only appropriately qualified persons may carry out
servicing and fault finding on this gas fired equipment.
Before commencing service ensure that both the gas and
the electricity are turned and switched "OFF" and that the
air heater has cooled down. Inadvertent substitution or
replacement of components similar to those specified or
replacement in a manner contrary to the method herein
described could constitute a hazard and lead to
prosecution.
When cleaning air heaters, wearing of eye
protection and a dust face mask is
recommended.
LCSA-4 air heaters will operate with a minimum of
maintenance. To ensure long life and satisfactory
and safe performance, an air heater that is operated
under normal conditions should be inspected and
cleaned at the start of each heating season. If the
air heater is operated in an area where unusual
amounts of dust, etc are present in the air, more
frequent servicing is recommended.
When any service is completed, be sure that
components are reassembled correctly to ensure
that no unsafe condition exists.
Upon completion of the service carry out the
commissioning instructions outlined in section 6 of
this document.
WARNING: Excessive dirt build-up on the
inside of the burner ports could cause
unburnt gas to spill out of the back of the
burner tube causing a fire or explosion.
To prevent this occurring,
clean all of the
burner ports at least annually.
Service procedure
The following procedures should be carried out at
least annually:
1. Remove the burner assembly as in section 8.1.
Clean thoroughly, (cleaning the burners requires
an emery cloth, wire brush and a cleaning cloth -
stubborn deposits on burners are best cleaned
using
"acetone"
as a solvent).
* Check the condition of the ignitor and clean to
remove all deposits. Check the spark gap (3,0
mm).
* Check the sensor - clean as necessary.
* Remove any soot deposits from the burner with
a wire brush. Clean the ports with a degreaser
or acetone. A vacuum cleaner or compressed
air may assist in this cleaning operation. Wipe
the
inside of the burner tube clean (cleaning
thoroughly with a degreaser as recommended
will retard future build-up of dirt). Inspect the
burner for any damage or deterioration. If the
burner is damaged or corroded, replace it.
2. The heat exchanger should remain clean unless
a problem has developed due to poor
combustion. Examine the heat exchanger tubes
internally and externally for any sign of
deterioration. The outside of the tubular heat
exchanger can be cleaned from the front of the
heater with an air jet and/or a flexible brush.
Remove any dust and grease deposits.
The inner surfaces of the heat exchanger can be
reached for cleaning with the burner and
combustion air fan (venter) assemblies removed.
Clean with a flue brush or a heavy wire to which
wire wool has been attached.
Brush inside each heat exchanger tube until all
foreign material has been removed. The use of a
flashlight is necessary to carry out this
operation.
3. Clean the axial fan blades, fan guard, and fan
motor to remove all external dirt . Check the
security of the fan on the motor.
Note:
Fan motors are lubricated for life
and do not require lubricating.
4. Remove any dirt and/or grease that may have
accumulated on the venter fan motor and its
housing.
NOTE:
The combustion air fan motors
are lubricated for life and do not require oiling or
greasing.
5. The gas multi-functional control valve requires
no field maintenance except cleaning of its
exterior and checking the condition of the wire
connections. Instructions for testing pressure are
given in section 6.6.
6. Check the flue/combustion air system for
soundness. Reseal/replace any parts that are
not sound.
7. Check all wiring connections. Check wiring for
any signs of damage. Replace any suspect
wiring with an equivalent specification.
8. Check operation of thermal fan control and
control relay.
9. When service is complete carry out full
commissioning procedure as per section 6 of this
document
.
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