PENSOTTI PCH 18 Instruction Manual page 48

Primary heat exchanger
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;
INSTALLATION INSTRUCTIONS
(see fig. 1)
primary heat
exchanger
Fig. 1
44
flue connection
chamber
ceramic fibre
washer
steinless steel
pipe coil