PENSOTTI PCH 18 Instruction Manual page 46

Electric fan
(see fig. 1)
Remove and dismantle the entire burner unit (see
"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 levels;
2
Expansion vessel
(see fig. 2)
Close the shut-off valves and drain the central
heating circuit of the boiler.
Use a 19 mm spanner to unscrew the pipe coupling
to the vessel.
Unscrew the fixing screws and remove the upper
mounting bracket. Remove the expansion vessel
from the front of the boiler.
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;
MAINTENANCE INSTRUCTIONS
venturi
Fig. 1
fixing bracket
expansion vessel
42
electric fan
Fig. 2