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b)
Keep it in soap solution for 10-15 minutes and clean its surfaces by means of a soft brush, then wash
it under a strong stream of water;
c)
Repeat all the process if necessary.
In order to remove scale deposit it is necessary to:
a) Remove the heat exchanger and put it into a tank;
b) Prepare a 10% solution of citric acid(100 g of powder citric acid for 1 l of warm water);
c) Fill in the heat exchanger's pipeline with the prepared solution. Leave the solution there for 10-15
minutes, then drain the solution and wash the pipeline thoroughly with water;
d) Repeat all the process if necessary.
12.3. Cleaning and connection of the contacts
During the technical service clean up the contacts of the thermo relay (draught sensor), the battery section,
the micro switch and electromagnetic valves if necessary. All contacts must not have oxidations and be
securely connected.
12.4 Sealings replacement
During technical service when disassembling of gas or water pipelines was effectuated, it is necessary to
obligatory install new sealings.
12.5 Checking the appliance's gas and water systems on air-tightness
After a regular technical service when disassembling of water and gas pipes was performed it is
necessary to check the appliance on air-tightness (see pp. 7.3.7 and 7.4.6 page 12).
12.6 Checking the thermo relay's (draught sensor's) working capacity
In order to check the thermo relay (draught sensor) it is necessary to remove the flue pipe from the
appliance, switch the appliance on and close the appliance's gas removal device's pipe with a metal sheet at
rated operating mode (with completely opened gas valve and rated water consumption). The appliance
should switch off within 10...60 seconds.
After testing, connect the flue pipe to the appliance, ensuring the joint's air-tightness.
12.7 Checking of the water temperature sensor's working capacity
In order to check the water temperature sensor it is necessary to measure hot water temperature with a
thermometer and compare it with the temperature indicated on the appliance's digital display.
12.8 Unscheduled cleaning of the appliance
Cleaning of the appliance might be required more often than once a year because of the intensive
appliance's operation in a premise with much dust in the air. You can notice it visually by the burner's
changed flame color. If the flame becomes yellow or smoky, it means that the burner is contaminated with
dust particles from the air and it is necessary to perform cleaning and technical service of the appliance. At
the burner's normal operation the flame must have blue color.
It is necessary to perform an unscheduled cleaning of the appliance also in case if in the premise where
appliance is installed, some constructional or repairing works were made and lots of dust and construction
waste got into the appliance.
ATTENTION! In case of dust accumulation in the inner units and details of the
appliance there is a risk of its inflammation
WORKS ORDER AT THE APPLIANCE'S REPAIR AND COMPONENTS REPLACEMENT
ATTENTION! The appliance's repair operations, connected with disassembling of its gas or water
pipelines, must necessarily be effectuated only after the appliance is completely switched off (the taps on the
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