Geyser Use - REMEHA Calenta 25s Installation And Service Manual

4. Installation
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9
6
2
28
External three-way valve
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2
2
3
4
3
5
4
6
7
5
8
9
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
8
electronics expansion kit (Accessory).
M
¼ For the installation or mounting of any accessories, refer to the
mounting instructions delivered with the accessories in question.
7
T001537-C
4.5.4.
1
2
3
1
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.
3
T001536-B
Boiler
Independent hot water tank
DHW sensor
Air vent kit of the hot water tank
Safety unit
Expansion vessel
Heating-Installation
3-way valve
SCU-X02 control PCB
In order to prevent an uncontrolled flow in the heating
4
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.
A safety unit is installed at the point where cold water
4
arrives at the hot water tank to prevent backflow or
overpressure.

Geyser use

Boiler
Filling/drainage valve
Expansion vessel
The flow and return connections of the unit have to be
connected.
Calenta 25s - 28c - 35s - 40c
040412 - 7600585-01