PENSOTTI PCH 34B-H Instruction Manual page 61

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.
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
electronic combustion analyzer.
Circulating pump (motor body) (see fig. 2)
Close the shut-off valves and drain the central
heating circuit of the boiler;
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 or cartridge only
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 all air
from the circuit. Restart the boiler.
INSTALLATION INSTRUCTIONS
levels; using an
2
venturi
electric fan
Fig. 1
Fig. 2
circulating
pump
58