Connection On The Heating Side - Viessmann Vitocell 100-H Technical Manual

Installation — DHW cylinders

6.4 Connection on the heating side

Connection on the heating side
According to DIN 4753, the water in the DHW cylinder may be heated
to approx. 95 ºC.
To ensure that the DHW temperature never exceeds 95 ºC, install a
control unit to regulate the heat supply in accordance with the following
circuit diagrams.
With the installation according to the diagrams on page 34 or 37,
the circulation pump for the DHW cylinder is switched by the temper-
ature controller. The spring-loaded check valve prevents continued
heating of the DHW cylinder due to natural circulation.
A water temperature controller may also be used instead of the tem-
perature controller (see diagrams on page 37).
Where heating water flow temperatures exceed 110 ºC, also fit a type-
tested high limit safety cut-out. For this, the combi boiler TR/HLSC with
2 separate thermostatic systems (temperature limiter and high limit
safety cut-out) is used (see diagrams on page 37).
Systems that already incorporate a high limit safety cut-out for limiting
the temperature of the heating medium to 110 ºC, (e.g. in the boiler),
require no additional high limit safety cut-out in the DHW cylinder.
Cylinder banks
For cylinder banks, it is sufficient to install a temperature controller in
only one of the cylinders.
Vitocell 100-H and 300-H
Control by starting/stopping the circulation pump.
130, 160 and 200 l capacity: Connection on the heating water side with one boiler
6
A Temperature sensor/temperature controller and high limit safety
cut-out (if required)
B Air vent valve
C Heating water return
D Boiler
VIESMANN
34
(cont.)
Vitocell 300-H:
With cylinder banks, make the connections on the heating water side
and arrange the temperature controller and high limit safety cut-out (if
required) as shown in the diagrams from page 36.
Vitocell 100-V and 300-V:
The cylinder bank is controlled by one temperature controller. There-
fore, the individual cylinders in a bank cannot be controlled separately.
Install the temperature controller in the last cylinder as seen from the
heating water flow (see diagrams on page 38).
Note
If, contrary to the diagram on page 38, the "heating water flow" is
connected from the right, install the sensor well for the temperature
controller in the last cylinder as seen from the heating water flow before
the manifold is installed.
If individual cylinders in a cylinder bank need to be controlled sepa-
rately, group the cylinders into several cylinder banks or install them
as individual cylinders.
E Heating water flow
F Circulation pump
G Spring-loaded check valve
H Vitocell 100-H or 300-H
DHW heating