PENSOTTI PCI 20-H, Instruction Manual

Page: 63 / 75

INSTALLATION INSTRUCTIONS
59
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
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.
Cleaning the D.H.W heat exchanger (see fig. 3)
Close the shut-off valve and drain the domestic hot
water circuit and central heating circuit of the boiler;
Use a 4 mm Allen key to unscrew the four screws
securing the heat exchanger to the multiplex unit;
Remove the heat exchanger from the left side of
the boiler, note its orientation;
De-scale the heat exchanger by chemically
washing the plates
Fit new rubber washer, inserting them in their
housings on the multiplex unit;
Re-assemble the heat exchanger and components
following the above procedure in reverse order;
Fill the system with water and check for any leaks
from the joints.
Fig. 2
circulating
pump
venturi
electric fan
Fig. 1
fixing
screws
Fig. 3
d.h.w heat
exchanger