6.7 Maintenance operations
Before carrying out any cleaning or part
replacement operations, ALWAYS turn off
the ELECTRICITY, WATER and GAS
supplies to the water heater.
FLOWMAX will not be held responsible for
damage to any of the water heater’s
components caused by non-compliance
with this instruction.
For all maintenance operations requiring removal of
the water heater casing, refer to the procedures
described in paragraph 6.3 “Accessing the
water heater”.
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 recommended
detergent from FLOWMAX Technologies 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 water heater to make sure that all
gas and exhaust joints are tight.
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