31
BIOCLASS iC 66
7
OPERATION WITH A BT-DUO BUFFER TANK (OPTIONAL)
The
BIOCLASS iC 66
boiler can be accompanied by a
BT-DUO Buffer tank
from the wide range of
tanks offered by
DOMUSA TEKNIK
. This tank accumulates heat energy that improves the performance
of the system when switching the boiler on and off. It also incorporates a DHW cylinder in its interior for
obtaining Domestic Hot Water. For its correct installation, carefully follow the assembly instructions
included with the tank and for its correct integration with the
BioClass iC 66
boiler, read the instructions
in the section
"Installing a BT-DUO Buffer tank"
in this manual.
In this operating mode you must select the desired set point temperature of the boiler
(see "Selecting the
boiler set point temperature")
and, using the adjustment thermostat of the control panel in the BT-DUO
buffer tank, you must also select the desired set point temperature in the buffer tank.
It is essential for
the operation of the installation that the set point temperature selected for the boiler exceeds
the set point selected for the thermostat of the BT-DUO buffer tank and it is recommended
that it be at least 5 to 10 °C higher
. The modulating burner of the
BioClass iC 66
boiler will start
working to heat the water within it. When the boiler temperature exceeds 60 ºC the feed pump for the
buffer tank will start up to heat the BT-DUO tank, provided that its control thermostat is activated
(demanding heating). When the BT-DUO tank thermostat reaches the desired temperature and turns off
the heating demand, the operation of its feed pump will be disabled.
Regarding the central heating service of the boiler, the circulation pump connected to it (
BC
) will be
activated whenever room thermostat No. 1 (
TA
1
), or the remote control
LAGO FB OT+
(if present),
demands heating. In other words, when the room temperature where the thermostat or the remote control
is installed is lower than that which is set. When the atmosphere reaches the desired temperature and
after a time of post-circulation (parameter
P.15
in the "Technician Menu"), the operation of the heating
pump (
BC
) will turn off.
Regarding the operation of the service for providing DHW, provided that a DHW temperature sensor is
installed in the
BT-DUO
tank, you must select the desired DHW set point temperature
(see "Selecting the
DHW set point temperature")
. The burner will ignite and the feed pump for the
BT-DUO
tank will be
activated whenever the water temperature of the boiler exceeds 60 °C. When the tank reaches the DHW
set point temperature selected and after a waiting period (parameter
P.16
in the "Technician Menu"), it
will once again be available to heat the central heating system, activating the central heating service. In
order to provide an optimal production of DHW, while this is active the boiler's central heating service will
remain disabled and it will not be restored until it has finished heating the DHW cylinder of the
BT DUO
tank.
The boiler's central heating service can be totally disabled (
Summer
mode
) by selecting a boiler set point
value of "
OFF
". In this operating mode, only the DHW production function will remain enabled, via the
cylinder integrated inside the
BT-DUO
tank. Also, you may totally disable the domestic hot water
production function by selecting "
OFF
" as the DHW set point temperature.
IMPORTANT: It is essential that the set point temperature of the boiler exceeds the set
point selected for the control thermostat of the buffer tank.
NOTE: For the correct operation of the BT-DUO buffer tank, parameters P.08 and P.09 in the
"Technician" menu must be set to 4 and 0 respectively.