Connection On The Heating Side; Connection On The Heating Side Without Return Temperature Limit - Viessmann Vitocell 300-H Technical Manual

Installation — DHW cylinders

6.4 Connection on the heating side

Connection on the heating side without return temperature limit

According to DIN 4753, the water in the DHW cylinder may be
heated to approx. 95 °C.
To ensure that the DHW temperature never exceeds 95 °C, install a
control unit to regulate the heat supply in accordance with the follow-
ing circuit diagrams.
With the installation according to the diagrams on page 40
and 42, the circulation pump for the DHW cylinder is switched by
the temperature 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 42).
When heating water flow temperatures exceed 110 °C, also fit a
type-tested high limit safety cut-out. For this, the TR/HLSC combina-
tion device with 2 separate thermostatic systems (temperature limiter
and high limit safety cut-out) is used (see diagrams on page 42).
Systems that already incorporate a high limit safety cut-out for limit-
ing the temperature of the heating medium to 110 °C, (e.g. in the
boiler), require no additional high limit safety cut-out in the DHW cyl-
inder.
Vitocell 100-H and Vitocell 300-H
A
G
130, 160 and 200 l capacity
A Temperature sensor/temperature controller and high limit safety
cut-out (if required)
B Air vent valve
6
C Heating water return
D Heating water flow
E Circulation pump
F Spring-loaded check valve
G Vitocell 100-H or Vitocell 300-H
VIESMANN
40
(cont.)
B
D
F E
C
Cylinder banks
For cylinder banks, it is sufficient to install a temperature controller in
only one of the cylinders.
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.
■ 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 41.
■ Vitocell 100-V and Vitocell 300-V:
The cylinder bank is controlled by one temperature controller. The
individual cylinders in a cylinder bank therefore cannot be control-
led separately. Install the temperature controller in the last cylinder
as seen from the heating water flow (see diagrams on page 42).
A
B
G
350 and 500 l capacity
A Temperature sensor/temperature controller and high limit safety
cut-out (if required)
B Air vent valve
C Heating water return
D Heating water flow
E Circulation pump
F Spring-loaded check valve
G Vitocell 100-H or Vitocell 300-H
F E D
C
DHW heating