11
3.9
Installation with a BT Buffer Tank (Optional)
The
BioClass TR
boiler can be accompanied by a
BT Buffer Tank
during the installation from the
wide range offered by DOMUSA TEKNIK, which may increase the benefits provided by the boiler in
the heating service.
For this reason, the electronic control of the boiler is equipped with an input for a temperature
sensor or a temperature thermostat (
Sbt
; terminals 18-19 on connection strip
J7
) and a circulation
pump output (
Bbt
; terminals N-7 on the connection strip
J2
) dedicated exclusively to managing the
heating of the buffer tank. Using these control elements of the boiler you will be able to manage 4
different modes of buffer tank hydraulic installation. The installation type will be selected using
parameter
P.08
in the "Technician" menu on the control panel.
The boiler is supplied with this installation option disabled. To enable it, the electrical resistance
(
Rbt
) connected between terminals
18
and
19
of connection strip
J7
(see "Connection Diagram")
must be disconnected and replaced with a temperature sensor (supplied as an option by DOMUSA
TEKNIK) or a control thermostat installed in the BT buffer tank. After disconnecting the resistance in
the "Technician" menu of the control panel, parameter
P.08
must be enabled, via which you can
select the installation mode desired.
The following sections describe in detail the hydraulic and electrical connection characteristics for
each installation mode.
3.9.1
Installation with Sanit DHW tank after BT tank and control by temperature sensor (P.08 = 1)
In this installation mode, all heating circuits, as well as the circuit for producing DHW by
accumulation, if present, must be hydraulically connected to the BT buffer tank. In other words, as
shown in the following hydraulic diagram, the BT buffer tank is connected to the boiler, interposing
a circulation pump (
Bbt
), and all the heating circuits of the system are connected to the BT tank.
The temperature of the BT tank is controlled and managed by a temperature sensor (
Sbt
) immersed
in the buffer tank and electrically connected to the boiler. The temperature sensor is optionally
supplied by DOMUSA TEKNIK.
Heating
Instal
DHW
After the hydraulic installation of all the system components, proceed as follows to carry out the
correct electrical connection of the BT buffer tank to the
BioClass TR
boiler:
-
Unplug the boiler from the mains power.
- Disconnect the electrical resistance (
Rbt
) connected between terminals
18
and
19
of
connection strip
J7
(see "Connection Diagram")
.
- Connect the BT tank temperature sensor (supplied optionally) to the sensor connection strip
J7
(
Sbt
; terminals
18
and
19
)
(see "Connection Diagram")
.
- Insert the temperature sensor bulb in the bulb-holder sheath provided in the buffer tank.
