Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 64

Installation – Vitotronic 300-K, MW1S
Sensor connection
(continued)
DHW tank temperature sensor
The sensor measures the domestic hot
water tank temperature.
5
720
700
680
660
640
620
600
580
560
540
0 20
32 68
DHW tank temperature in °C / °F
64
Heating systems with domestic hot
water heating (single-boiler systems
only)
1. Install the DHW tank temperature
sensor.
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.
40 60 80
104 140 176
See installation instructions
for domestic hot water tank
100
212
Check the sensor
1. Disconnect the sensor from the
terminals.
2. Measure resistance of sensor at
terminals "1" and "2" of the plug.
DHW tank Resistance
temperature in Ω Ω Ω Ω
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 + 170 °C
- 4 to + 158 °F
Electrical connection
Connect in accordance with the
overview on page 58 and 59 and
the control panel wiring diagram.
Remove the plug from the sensor cable.
Heating systems without domestic
hot water heating
Do not connect the DHW tank
temperature sensor.