90
60T - 280T
COSMOGAS
18.10 - Emptying the boiler
1.- generate a request for heat by increasing the domestic hot
water and central heating temperature (in the MYDENS
version, if necessary also close the room thermostat link;
2.- wait for the burner to come on (in multi-burner versions wait
for all the burners to come on (see corresponding icons “L”
in figure 17-1 which all come on when all burners are on);
3.- switch the appliance off. In this way any motorised valves
present stay on);
4.- close the system fill cock provided by the installer;
5.- connect a flexible rubber hose to the drain valves “38” in
Figures 3-3, 3-5 and 3-7 and use it for draining into a sink
drain or similar;
6.- wait for the water inside the boiler to cool to below approx.
40°C;
7.- slowly open the drain valves;
8.- Open the air vent valves of the heating elements. Start
from the highest central heating elements and continue
with the lowest.
9.- Once all of the water has been evacuated, close all of the
heating element vent valves and drain cocks.
WARNING! Do not salvage and/or reuse the
water evacuated from the central heating circuit for any
purpose as it could be polluted.
18.11 - Minimum and maximum power
Operation can be forced at minimum maximum or ignition
power, proceed as follows:
1.- make sure that the heat generated by the boiler can be
dispersed by the system;
WARNING! When forcing the delivery
temperature, it automatically sets itself at 93°C to
dispose of as much of the heat generated by the boiler
as possible. Check whether the system can support
this temperature.
2.- access parameter
2010
(
2200
for multi-burner
models) located in the “installer menu” (see section 17.15);
3.- set the parameter at the following value:
a)
Lo
. to force the burner, or all the burners, at minimum
power;
b)
Ign
to force the burner, or all the burners, at ignition
power;
c)
High
to force the burner, or all the burners, at
maximum power;
4.- To end forcing, return parameter
2010
(
2200
for
multi-burner models) to the
0FF
value and press the
RESET button.
WARNING! If during forcing, the power supplied
by the boiler is much higher than the power absorbed by
the system, the boiler switches off continuously to reach
the maximum temperature allowed (93°C).
The same procedure as above can also be applied to multi-
burner boilers models from 100T to 280T but it must be
borne in mind that only one burner can be forced at a time,
moving the display from one burner to another, as described
in section 18.8.
18.12 - Checking the ionisation current
In any state of operation, even during minimum and maximum
power checks as described in section 18.11, it is possible
to consult the value of the ionisation current on parameter
1008
that appears in the “user menu” (section 17.14). This
value must be between 4 and 7 uA (microampere).
Since parameter
1008
, on multi-burner boilers (models from
100T to 280T) relates to Burner 1 (Master), you must refer to
section 18.8 to do the check on the other burners.
18.13 - Checking combustion efficiency
According to national laws on gas appliances, it is necessary
to periodically check the combustion efficiency;
To do this, operate exactly as stated in section 16.8 and check,
along with the power, the combustion efficiency, which must
be over the regulatory requirements.
18 - MAINTENANCE
