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7.1 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 buildup 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 greasing.
4. Remove any dirt and/or grease that may have accumulated
on the venter fan motor and its housing.
NOTE:
Venter fan
motors are lubricated for life and do not require greasing.
5. The gas multi-functional control valve requires no field
maintenance except cleaning of it's 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.
8.0 Removal & replacement of parts
SCA air heaters must only be fitted with AmbiRad authorized
replacement parts. These heaters must use certificated spare
parts to comply with legislation.
8.1 Main burner removal
Instructions for burner removal (see figure 8):
1. Turn OFF the gas supply to the air heater.
2. Switch OFF the electricity supply to the air heater.
3. Open the access door.
4. Disconnect the union in the gas supply outside of the
appliance.
5. Remove gas supply pipe from multi-functional gas control
valve.
6. At the burner rack assembly, remove the nuts that secure
the burner manifold to the burner rack. Lift the burner
rack/manifold assembly upward and pull the assembly out
of the air heater.