External three-way valve
1
Boiler
2
Independent hot water tank
3
DHW sensor
4
Air vent kit of the hot water tank
5
Safety unit
6
Expansion vessel
7
Heating-Installation
8
3-way valve
9
SCU-X02 control PCB
Control SCU-X02 must be used to install the three-way valve outside
of the boiler (Accessory). The three-way valve 24 V/230 V is
controlled by control SCU-X02. The control must be installed in the
electronics expansion kit (Accessory).
¼
For the installation or mounting of any accessories, refer to the
mounting instructions delivered with the accessories in question.
4
In order to prevent an uncontrolled flow in the heating
circuit, the return channel to the hot water tank must
always be connected directly to the return channel to
the boiler and therefore never directly connected to
the heating installation.
4
A safety unit is installed at the point where cold water
arrives at the hot water tank to prevent backflow or
overpressure.
4.5.4.
Geyser use
1
Boiler
2
Filling/drainage valve
3
Expansion vessel
The combi boiler can also be used solely for DHW operation. The
boiler can then function as a geyser. The central heating function has
to be switched off for this purpose, using parameter
p3
.
The flow and return connections of the unit have to be
connected.
T001537-C
1
2
4
8
6
7
M
3
5
9
T001536-B
1
2
3
4. Installation
Calenta 25s - 28c - 35s - 40c
28
040412 - 7600585-01
