PENSOTTI PCI 18, Instruction Manual

Page: 59 / 70

INSTALLATION INSTRUCTIONS
55
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 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 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 water heater.
Cleaning the D.H.W heat exchanger (see fig. 1)
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
Fig. 1
d.h.w heat
exchanger
fixing
screws