Maintenance Operations - PENSOTTI PCH 18 Instruction Manual

6.6 Maintenance operations

Before carrying out any cleaning or part
replacement operations, ALWAYS turn off
the ELECTRICITY,
supplies to the boiler.
Pensotti North America will not be held
responsible for damage to any of the
boiler's components
compliance with this instruction.
For all maintenance operations requiring removal of
the boiler casing, refer to the procedures described in
paragraph 6.3 "Accessing the boiler".
Cleaning the main exchanger module and
combustion unit (see fig. 1)
Disconnect the electrical connections of the electric
fan.
Disconnect the joint and remove the pipe linking
the gas valve to the injector unit (venturi).
Disconnect the joint and remove the gas feed pipe
from the gas valve.
Un-plug the ignition electrode and flame detection
wires from the ignition control unit.
Unscrew the ring-nut at the bottom of the room-
sealed chamber and remove the gas valve.
Unscrew the nuts securing the burner unit
(consisting of a fan, manifold and burner) to the
primary heat exchanger.
Remove the burner unit, paying particular attention
not to remove the ceramic fibre protection from the
bottom of the heat exchanger.
Check that the burner is not affected by deposits,
scaling or excessive oxidation. Check that all the
holes in the burner are free;
Clean the electrodes carefully without altering their
positions with respect to the burner;
Clean the burner cylinder using a non-metal brush
and without damaging the ceramic fibre;
Check the integrity of the washer on the cover of
the burner;
Clean the heat exchanger (see fig. 2) using a
household detergent for stainless steel, distributing
the product on the spirals of the exchanger using a
brush. Do not wet the ceramic fibre coating. Wait a
few minutes then remove the deposits using a non-
metal brush. Then remove the residues under
running water;
Remove the pipe clip, remove the condensate
drainpipe and clean under running water.
Unscrew the joint to the condensate trap, remove
the trap and wash under running water.
With the cleaning completed, re-assemble the
components following the above procedure in
reverse order.
Finally, check the boiler to make sure that all gas
MAINTENANCE INSTRUCTIONS
WATER and GAS
caused by non-
burner
Fig. 1
primary heat
exchanger
Fig. 2
39
primary heat
exchanger
premix burner unit
B
A
ionisation
electrode
ignition
electrode
flue connection
chamber
ceramic fibre
washer
stainless steel
pipe coil