Viessmann VITOLIGNO 300-P Service Instructions Manual page 111

Repairs
(cont.)
Checking the room temperature sensor
Curve
100
10
1
0.1
0 20 25
Temperature in °C
Measure the resistance between termi-
nals 9 and 13c.
Specification
Safety category
IP rating
Sensor type
Permissible ambient temperature
■ During operation
■ During storage and transport
40 60 80 100
Enabling the room temperature sen-
sor
Installation and service instruc-
tions for Vitotrol 300A
Ill
IP 53
NTC 10 kΩ, at 25 °C
–20 to+90 °C
–20 to +70 °C
Troubleshooting
111