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Install the new insulation:
1. put two dots of temperature-resistant silicone glue, (Loctite 5366
or Otto
2. seal S17), according to the location indicated.
3. make sure that the burner is in proper condition, remove any
possible
4. insulation residues on the burner
5. engage the insulation carefully and place it in contact with the
two dots of
6. silicone glue
7. check the condition of the electrode, if necessary replace it
8. reinstall the electrode and mount the burner door correctly back
onto the
9. heat exchanger, taking in account the correct torque values, see
§ 19.3.1
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 fail-
ures. 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 the burner door is removed). This
water will exit the heat exchanger by the condensate trap. Notice: do not 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 re-
moved with a vacuum cleaner and by flushing the water heater combustion chamber with water. Never expose
the refractory insulation in the back of the combustion chamber to water or get it wet. Do not 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 O
percentage (flue gas) at the maximum and minimum load of the water heater. If necessary, adjust these
2
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 suffi-
cient 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.
124
The condensate trap must al-
ways be filled to the edge with
water, before replacing to the
E93.1804.014
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