MAINTENANCE INSTRUCTIONS
47
Cleaning the D.H.W heat exchanger
(see fig. 1)
•
Close the shut-off valve and drain the domestic hot
water circuit and central heating circuit of the boiler;
•
Use a 4 mm Allen key to unscrew the two screws
securing the heat exchanger to the multiplex unit;
•
Remove the heat exchanger from the left side of the
boiler, note its orientation;
•
De-scale the heat exchanger by chemically washing
the plates
•
Fit new rubber washer, inserting them in their
housings on the multiplex unit;
•
Re-assemble the heat exchanger and components
following the above procedure in reverse order;
•
Fill the system with water and check for any leaks
from the joints.
Part replacement
:
Ignition and/or flame detection electrodes
(see fig. 2)
•
Un-Plug the electrode wires;
•
Slacken the fixing screws;
•
Remove the electrodes. When fitting the new ones,
check that the seals are not damaged. Replace if
necessary;
•
Reconnect
the
wires
and
re-assemble
the
components following the above procedure in reverse
order;
•
Switch on the power supply and restart the appliance;
If the boiler does not restart, check the positions of
the electrodes (especially the ignition electrode).
Make sure that original position and distances
between the electrodes and the burner are
respected to avoid a boiler malfunction).
Fig. 2
ionisation
electrode
ignition
electrode
Fig. 1
d.h.w heat
exchanger
fixing
screws
Summary of Contents for RKA 34
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