Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual page 27

Connection of the DHW tank temperature sensor
The sensor measures the domestic hot
water tank temperature.
5
sensor and tank
temperature sensor
720
700
680
660
640
620
600
580
560
540
0 20
32 68
DHW tank temperature in ºC / ºF
Heating systems with domestic hot
water heating (single-boiler systems
only)
1. Install the DHW tank temperature
sensor.
See Installation
Instructions for domestic
hot water tank.
Please note:
When installing the sensor in DHW
tanks of other makes, make sure
that the sensor is pressed against
the sensor well of the DHW tank
by means of a suitable device.
2. Ensure that the maximum
permissible domestic hot water
temperature is not exceeded. If
necessary, install a suitable safety
device for this purpose.
Heating systems without domestic
hot water heating
Do not connect the DHW tank
temperature sensor.
40 60 80 100
104 140 176 212
Installation
Check the sensor
1. Disconnect plug % in the
terminal compartment of the
boiler control.
2. Measure resistance of sensor
at terminals "1" and "2" of the
plug.
DHW tank Resistance
in 
temperature
in °C / °F
40 / 104 578
50 / 122 597
60 / 140 616
3. Compare the value measured
with the current temperature.
If the value differs significantly,
check installation and, if
necessary, replace sensor.
Technical data
Degree of protection: IP 32
Ambient temperature
During operation:
0 to + 90 °C
32 to + 194 °F
During storage and transport:
-20 to + 70 °C
-4 to + 158 °F
Electrical connection
The sensors are ready to plug in.
Insert the DHW temperature
sensor in socket "5" of the boiler
control.
27