INSTALLATION INSTRUCTIONS
60
Electric fan (see fig. 1)
• Remove and dismantle the entire burner unit (see
“Cleaning the burner unit”).
• Use an 8 mm wrench 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 tank (see fig. 2)
• Close the shut-off valves and drain the central
heating circuit of the water heater.
• Use a 19 mm wrench to unscrew the pipe coupling
to the tank.
• Unscrew the fixing screws and remove the upper
mounting bracket. Remove the expansion tank from
the front of the water heater.
• Replace the expansion tank 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;
Circulating pump (motor body) (see fig. 1)
• Close the shut-off valves and drain the central
heating circuit of the water heater;
• Use a 5 mm Allen key to unscrew the four screws
securing the motor body to the impeller body;
• Remove the motor body and check the condition of
the washer. If necessary, replace the washer;
• Replace the circulation pump 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.
Restart the water heater.
pump
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