INSTALLATION INSTRUCTIONS
TA05A140.A0307
41
6.6.1 Cleaning the main exchanger
module and combustion unit
(see fig. 1)
•
Disconnect the electrical connections of the
electric fan.
•
Disconnect the joint and remove the pipe
linking the gas valve to the injector unit
(venturi).
•
Disconnect the joint and remove the gas
feed pipe from the gas valve.
•
Un-plug the ignition electrode and flame
detection wires from the ignition control unit.
•
Unscrew the ring-nut at the bottom of the
room-sealed chamber and remove the gas
valve.
•
Unscrew the nuts securing the burner unit
(consisting of a fan, manifold and burner) to
the primary heat exchanger.
•
Remove the burner unit, paying particular
attention not to remove the ceramic fibre
protection from the bottom of the heat
exchanger.
•
Check that the burner is not affected by
deposits, scaling or excessive oxidation.
Check that all the holes in the burner are
free;
•
Clean the electrodes carefully without
altering their positions with respect to the
burner;
•
Clean the burner cylinder using a non-metal
brush and without damaging the ceramic
fibre;
•
Check the integrity of the washer on the
cover of the burner;
•
Clean the heat exchanger (see fig. 2) using
a household detergent for stainless steel,
distributing the product on the spirals of the
exchanger using a brush. Do not wet the
ceramic fibre coating. Wait a few minutes
then remove the deposits using a non-metal
brush. Then remove the residues under
running water;
•
Remove the pipe clip, remove the
condensate drainpipe and clean under
running water.
•
Unscrew the joint to the condensate trap,
remove the trap and wash under running
water.
•
With the cleaning completed, re-assemble
the components following the above
procedure in reverse order.
•
Finally, check the boiler to make sure that all
gas and exhaust joints are tight.
primary heat
exchanger
flue connection
chamber
stainless steel
pipe coil
ceramic fibre
washer
Fig. 2
Fig. 1
premix burner unit
burner
ionisation
electrode
ignition
electrode
primary heat exchanger
Summary of Contents for RK 25
Page 2: ......
