PENSOTTI Solenne PCH50B-H Instruction Manual page 68

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
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;
MAINTENANCE INSTRUCTIONS
primary heat
exchanger
and then the
Fig. 1
flue connection
chamber
ceramic fiber
washer
stainless steel
pipe coil
66