46
4.3 - Burner flame
Periodically check the appearance
of the burner flame. It should be
uniformly distributed over the entire
surface of the burner, it should be
light blue in color, and the surface
where combustion takes place
should be black with incandescent
red spots.
4.4 - Safety relief
valves
If the safety relief valves discharge
periodically, this may be due to
thermal expansion in a closed
water supply system.
Contact the water supplier or local
plumbing inspector on how to
correct this situation. Do not plug
the safety relief valves.
4.5 - Flue gas
discharge
Periodically check the state of the
flue gas discharge and air intake
system
Check and clean any filters
installed on the air intake terminal.
Inspect the entire flue gas
discharge line for any foreign matter
(bees’ nests, birds’ nest, etc.) To
determine any blockage in the
venting check the pressure at the
burner (see chapter 3.32) if the
pressure is low there may be an
obstruction in either the flue gas
discharge or air intake pipe.
4.6 - Combustible
material
Check that the room where the
water heater is installed is free from
combustible materials, gasoline or
other flammable vapors and liquids
4.7 - Draining the
heating side of
the heater
To drain the heating side of the
heater proceed as follows:
turn off the heater;
turn on the domestic hot water to
cool the heater until the
temperature indicated by the
thermometer is less than 104°F
4 - MAINTENANCE
(40°C);
close the main cold water supply
valve;
remove the cover panels (see
chapter 3.28);
connect a rubber hose to the
heating drain valve “12” (see
figure 26) and place the opposite
end in a drain.
open the drain valve “12”;
open the radiator air vents. Start
from the radiators positioned
highest and then continue with
the lower ones.
After draining all the water, close
the radiator air vents and the
drain valve “12”;
CAUTION !!!
Do not recover
and/or reuse the water drained from
the heating circuit for any purpose
whatsoever, as it may be
contaminated.
4.8 - Draining the
domestic side of
the heater
To drain the domestic side of the
heater, proceed as follows:
close the main domestic cold
water supply valve of the home;
open all the hot and cold water
faucets in the house;
make sure that at least one of
these valves is at a lower level than
the heater.
CAUTION !!!
before the
system can be reused, it must be
filled by following the procedure
described in chapter 3.25, being
sure, after having filled the system,
to run the domestic hot and cold
water for approximately 1 minute
from every valves in the home. This
is necessary to flush the system of
any water contaminated by the
heating circuit.
