Viessmann Vitoligno 300-P Service Instructions For Contractors page 86

Troubleshooting
Repairs
(cont.)
Check sensor
760
740
720
700
680
660
640
620
600
580
560
540
0 20 40 60 80 100 120 140
Temperature in °C
Specification
Sensor type
Protection
Permiss. ambient
temperature
■ during operation
■ during storage
and transport
Outside temperature sensor
Connection
See chapter "Connection and wiring dia-
gram" from page 121.
86
Boiler water tem-
perature sensor
Pt500
IP 32
0 to + 130 °C
−20 to + 70 °C
1. Pull corresponding plug.
2. Check the sensor resistance at the
plug.
3. Compare the measurement with the
actual temperature displayed (for
scanning, see chapter "Tempera-
tures, boiler coding card and brief
scans").
Check the installation and, in the
case of severe deviation, replace the
sensor.
Cylinder, buffer
cylinder tempera-
ture sensor
Pt500
IP 32
0 to + 90 °C
−20 to + 70 °C
Collector tempera-
ture sensor
Pt500
IP 53
0 to + 200 °C
−20 to + 70 °C