Maintenance Operations - PENSOTTI PCI 34 Instruction Manual

6.7 Maintenance operations

Before carrying
replacement operations, ALWAYS turn off the
ELECTRICITY, WATER and GAS supplies to the
boiler.
Pensotti LLC will not be held responsible for
damage to any of the boiler's components caused
by non-compliance with this instruction.
For all maintenance operations requiring removal of the
boiler casing, refer to the procedures described in
paragraph 6.4 "Accessing the boiler".
Cleaning the main exchanger module and combustion unit
(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 gasket on the cover of the
burner.
Clean the heat exchanger 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 and exhaust joints are tight.
MAINTENANCE INSTRUCTIONS
out any cleaning or part
Fig.
1
primary
heat
exchanger
Fig. 2
Fig.
2
primary heat
exchanger
premix burner unit
B
burner
ionisation
electrode
Fig. 1
ignition
electrode
stainless
steel pipe
coil
A
flue
connection
chamber
ceramic fibre
washer
56