PENSOTTI PCH 50B-H, Instruction Manual

Page: 66 / 80

MAINTENANCE INSTRUCTIONS
64
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.
•
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; using an
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.
Fig. 1 electric fan
venturi
Fig. 2
circulating
pump