Connection On The Heating Side With Return Temperature Limit - Viessmann Vitocell 100-H Technical Manual

Installation — DHW cylinders
Vitocell 100-V and 300-V as a cylinder bank
Connections on the heating water side
A DHW
B Temperature sensor/temperature controller
C Heating water return
D Cold water

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 ºC).
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 (type EVI)
Installation of the sensor for limiting the return temperature in the heating water return for individual cylinders.
6
A Water temperature controller
B Gland fitting
C Tee
D Fitting
E Thermal insulation
F Sensor for the return temperature limiter
Vitocell 100-V and 300-V as a cylinder bank
Installation of the sensor for limiting the return temperature in the heating water return.
VIESMANN
38
(cont.)
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 provided.
G Indirect coil
H Heating water return
K Sensor for return temperature limiter
L Sensor for water temperature controller
M Heating water flow
DHW heating