MAINTENANCE INSTRUCTIONS
51
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 four
screws securing the heat exchanger to the
multiplex unit.
•
Remove the heat exchanger from the left side
of the boiler, note its orientation.
•
Fit new rubber washer, inserting them in their
housings on the multiplex unit.
•
Replace the heat exchanger and re-assemble
the components following the above procedure
in reverse order.
•
Switch on the electricity, water and gas
supplies, fill the system with water and check
for any leaks from the joints.
Storage Cylinder
(see fig. 2)
•
Close the shut-off valves and drain the central
heating circuit of the boiler;
•
Use a 30 mm key to unscrew the heating flow
and return pipes (fig. 2 – pos. A);
•
Use a 24 mm key to unscrew the D.H.W flow
and return pipes (fig. 2 - pos.B);
•
Lift the storage cylinder by releasing it from the
boiler frame (fig. 2 - pos.C);
•
Remove the storage cylinder by shifting it on
the right side (fig. 2 - pos.C);
•
Replace the storage cylinder and re-assemble
the components following the above procedure
in reverse order;
•
Switch on the electricity, water and gas supplies
and fill the system with water. Check for any
leaks from the joints and bleed off any air from
the circuit.
Fig. 2
D.H.W heat
exchanger
fixing screws
Fig. 1
B
C
A
cylinder
heating flow pipe
return flow pipe
D.H.W. return pipe
D.H.W. flow pipe
Summary of Contents for RK 25 /B
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