Alarko SERADENS SRD 20, Инструкция по установке, эксплуатации и обслуживанию

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53
Cleaning the D.H.W heat exchanger
(see fi g. 24)
● 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 four 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 compo-
nents 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 fl ame detection electrodes
(see fi g. 25)
● Un-Plug the electrode wires;
● Slacken the fi xing screws;
● Remove the electrodes. When fi tting the new
ones, check that the seals are not damaged.
Replace if necessary;
● Reconnect the wires and re-assemble the com-
ponents following the above procedure in re-
verse order;
● Switch on the power supply and restart the ap-
pliance;
Fig. 2
ionisation
electrode
ignition
electrode
Fig. 1
d.h.w heat
exchanger
fixing
screws
If the boiler does not restart, check the posi-
tions 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 mal-
function).
24
25