Connection On The Heating Side With Return Temperature Limit - Viessmann Vitocell 300-H Technical Manual

Installation — DHW cylinders
Vitocell 100-V and Vitocell 300-V
Control by starting/stopping the circulation pump
A
B E D
F
A Air vent valve
B Heating water flow
C Vitocell 100-V or Vitocell 300-V
D Spring-loaded check valve
E Circulation pump
F Heating water return
G Temperature sensor/temperature controller and high limit safety
cut-out (if required)
Vitocell 100-V and Vitocell 300-V as a cylinder bank
6
A DHW
B Temperature sensor/temperature controller
C Heating water return

Connection on the heating side with return temperature limit

The return temperature limiting facility only needs to be installed if
required by the relevant district heating plant.
To ensure that the heating water return temperature cannot exceed a
specified value, use a return temperature limiter with control valve
e.g. as offered by Samson, type 43-1, control range 25 to 70 °C.
For individual cylinders and cylinder banks, install the sensor as
shown in the relevant diagrams. The customer is responsible for
installing the necessary pipework.
Vitocell 100-V and Vitocell 300-V
Installation of the sensor for limiting the return temperature in the heating water return for individual cylinders.
VIESMANN
42
(cont.)
G
C
Control via a control valve
B
H
G
C
B Heating water flow
C Vitocell 100-V or Vitocell 300-V
G Heating water return
H Sensor for water temperature controller
D Cold water
E Heating water flow
F Air vent valve
G Drain
The control valve is sized according to the required heating water
flow rate and the system pressure drop.
Note
When return temperatures are restricted, a check must be carried
out to determine whether the hygiene requirements in accordance
with TRWI/DVGW are met. A transfer pump may have to be provi-
ded.
DHW heating