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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
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