E93.1803.901 HW
124
The condensate trap must always
be filled to the edge with water, be-
fore replacing to the unit.
Install the new insulation:
- put two dots of glue silicone, temperature-resistant (Loctite 5366 or Otto
seal S17), according to the location indicated.
- make sure that the burner is in proper condition, remove any possible in-
sulation residues on the burner
- put a plastic protection skirt around the burner to protect the insulation from
the burner.
- engage the insulation carefully and place it in contact with the two dots of
silicone glue
- remove the plastic protection skirt
- check the condition of the electrode, if necessary replace it
- reinstall electrodes- mount the burner door correctly back onto the heat
exchanger, taking in account the correct torque values, see § 20.2.2
Fan
When the fan blades are polluted and dirty, carefully clean the blades with a soft brush. Notice: do not use too
much force on the blades or else the fan might be out of balance and run irregularly, causing noises and fan
failures. Check the fan also for any water damages. In doubt always replace the fan of the water heater.
Condensate trap
Disassemble the condensate trap and clean every part of it. Check the condensate trap connection of the heat
exchanger for any blocking or pollution and clean it (if necessary). Check the functioning of the condensate trap
by pouring clean tap water in the water heater combustion chamber (when burner door is removed). This water
will exit the heat exchanger by the condensate trap. Notice: d
on’t wet the rear wall insulation.
When mounting the bottom part of the condensate trap, before commissioning the water
heater and/or after maintenance, the condensate trap must
ALWAYS
be completely
filled with water.
This is a safety measure: the water in the condensate trap keeps the flue gases
from leaking out of the heat exchanger via the condensate drain.
Heat exchanger and water heater combustion chamber
After the removal of the complete burner unit check if there is any debris and dirt in the heat exchanger. The coils
of the heat exchanger can be cleaned by using a
non-metallic
brush. After this the dirt and dust can be removed
with a vacuum cleaner and by flushing the water heater combustion chamber with water. Never expose the refrac-
tory insulation in the back of the combustion chamber to water or get it wet.
Don’t forget afterwards to clean the
condensate trap once again.
Gas/air ratio
With every service check and/or maintenance of the water heater always check the gas/air ratio by measuring the
CO
2
percentage (flue gas) at the maximum and minimum load of the water heater. If necessary, adjust these
values. See for information chapter “Adjusting and setting the water heater” chapter 19.
Pump (supplied separated from the water heater)
Check the electrical parts and the motor of the pump for a correct functioning. The pump must generate a sufficient
water flow over the (heat exchanger of) the water heater. When the pump produces noise, is operational for more
than five years or has signs of water leakage it is recommended to replace the pump as a precaution.
WARNING
WARNING
Содержание CB 105 HW
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