PENSOTTI PCI 20-H, Instruction Manual

Page: 65 / 75

INSTALLATION INSTRUCTIONS
61
Primary heat exchanger (see fig. 1)
Close the shut-off valves and drain the central
heating circuit of the boiler;
Switch off the power and gas supply to the
boiler;
Remove and dismantle the entire burner unit (see
“Cleaning the condensation module and burner
unit”);
Remove the gas valve;
Remove the spring and then the condensate
drainpipe;
Remove the fixing springs and then the delivery and
return pipes;
Remove the support brackets and pull out the heat
exchanger;
Remove the regulation sensor from the old heat
exchanger and refit it together with the two
condensate drainpipes to the new one;
Replace the heat exchanger 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.
Restart the boiler, making sure that there are no gas
leaks;
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 left side 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;
primary
heat
exchanger
flue
connection
chamber
stainless steel
pipe
coil
ceramic fibre
washer
Fig. 1
A
B
expansion vessel
Fig. 2
expansion vessel pipe