MAINTENANCE INSTRUCTIONS
50
Electric fan
(see fig. 1)
•
Remove and dismantle the entire burner unit
(see
6.6.1 “Cleaning the burner unit”)
.
•
Use an 8 mm spanner to unscrew the four nuts
securing the electric fan to the gas manifold and then
remove the electric fan, noting the positions of the
washer and diaphragm.
•
Remove the air intake duct, unscrew the two fixing
screws from the venturi and remove the electric fan,
paying particular attention not to damage the cork
gasket.
•
Replace the electric fan and re-assemble the
components following the above procedure in
reverse order.
•
Switch on the electricity, water and gas supplies and
check the soundness of the joint by measuring the
CO
2
levels;
Expansion vessel
(see fig. 2)
•
Close the shut-off valves and drain the central
heating circuit of the boiler;
•
Use a 19 mm key to unscrew the pipe coupling to
the expansion vessel (pos. A);
•
Lift the expansion vessel shifting it anticlock-wise in
order to remove it (pos. B);
•
Replace the expansion vessel 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.
A
B
expansion vessel
Fig. 2
expansion vessel pipe
venturi
electric fan
Fig. 1
Summary of Contents for RK 25 /B
Page 2: ......
