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b)
Hold it in the solution for 10-15 minutes and effect cleaning of dirty surfaces with the help of a soft brush, then
wash it with a strong water stream;
c)
If necessary repeat the whole process.
In order to remove scale deposit it is necessary to:
a) Remove the heat exchanger and put it into a tank;
b)
prepare 10% citric acid solution (100 g citric acid powder for 1 litre warm water);
c)
pour the prepared solution into the heat exchanger's pipeline and leave for 10-15 minutes, than pour the solution
out and wash the pipeline thoroughly with water;
d)
If necessary repeat the whole process.
12.3.3. Sealings replacement
At technical service, when disassembling and assembling of water and gas pipelines is effectuated, it is necessary to
install new sealings.
12.3.4. Checking of the appliance's gas and water systems airtightness
After one of the regular technical services, when disassembling of water and gas pipelines was effectuated, it is
necessary to check the appliance for airtightness (see p. 7.3.7 and 7.4.5).
12.3.5.Checking of thermorelay's (draught sensor's) working capacity
In order to check the thermorelay it is necessary to disconnect the gas flue pipe from the appliance, switch the
appliance on and close the appliance's gas hose by a metal sheet at rated operating mode (with the completely opened
gas tap and rated water consumption). The appliance must switch off in 10...60 seconds. In case if the thermorelay is out
of service it is necessary to replace it, removing it from the gas removal device (scheme 12,14). For its replacement only
a thermorelay provided by the manufacturer company may be used. After replacing the thermorelay it is necessary to
repeat the test run.
After checking the gas flue pipe must be connected to the appliance, providing the connection's airtightness.
12.3.6. Unscheduled cleaning of the appliance
It may be required to effect the appliance's cleaning more frequently than once in 1 12 months, in case of intensive
operation of the appliance in a premise where there is much dust in the air. This can be defined visually by the changed
flame color of the ignition and main burners of the appliance. If the flame has become yellow or smoky, this indicates that
the burner has been dirtied by the particles of dust from the air, and it is necessary to effect the cleaning and technical
service of the appliance. At the burner's normal operation the flame must be blue..
Unscheduled cleaning of the appliance must necessarily be effectuated also in case if in the premise where the
appliance is installed, construction or reparation works were effectuated and much construction dust and waste got into
the appliance.
ATTENTION! In case of dust accumulation on the appliance's inner blocks and details its inflammation is
possible.
13. WORKS ORDER AT THE APPLIANCE'S REPAIR AND SPARE PARTS RE-
PLACEMENT
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 water and
gas pipelines by the inlet into the appliance must be closed). When disassembling and assembling of the water
and gas pipelines is effectuated, it is recommended to install new sealings. After replacing the blocks and details
it is necessary to effect the assembling in the inverted sequence.
Schemes of the appliances are represented on scheme 18 page 35
13.1. Casing removal.
13.1.1. Remove the knobs 10, pulling them toward yourself.
13.1.2. Disconnect the wires, connecting the display 12 with the electronic control block and water temperature
sensor.
13.1.4. Screw out two self-threading screws, bonding the casing 11 with the carcass carrier 1, at the bottom part of
the appliance.
13.1.5. Pull the bottom part of the casing 11 towards yourself, move it upwards and remove from the appliance.
13.2. Burner replacement.
13.2.1. Remove the casing, see p. 13.1.
13.2.2. Disconnect the wires from the ignition plug 18 and the flame sensor 19.
13.2.4. Screw out the captive nut of the burner collector 3.
13.2.5. Screw out two fixation screws of the burner 3 connecting it to the carcass carriers 1 and remove the burner.
13.2.6. Install the new burner.
13.2.7. Check for airtightness the joints, subject to disassembling, on the operating appliance by means of soap solu-
tion bubble test (see p. 7.3.7 and 7.4.5).
13.2.8. Check the new burner's operation on the operating appliance.
13.3. Heat exchanger replacement
13.3.1. Effect the works listed in pp. 13.2.1-13.2.5
13.3.2. Screw out two self-threading screws connecting the plank 14 to the gas removal device and remove the
plank.
13.3.3. Screw out two captive nuts from the heat exchanger's taps 2 and remove it.
13.3.4. Install the new heat exchanger.
13.3.5. Check the joints subject to disassembling for airtightness on operating appliance by means of soap solution
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