Viessmann Vitocal 242-S Installation And Service Instructions Manual page 103

Repairs
(cont.)
Sensor
■ Collector temperature sensor
(F21)
■ Compressor head temperature
sensor (hot gas) (CTT)
Temperature sensors in the internal unit (with marking)
Viessmann NTC 10 KΩ (blue marking)
Outside temperature sensor
200
100
80
60
40
20
10
8
6
-20 -10 0
Temperature in °C
Captur-
ing ele-
ment
NTC
20 kΩ
NTC
50 kΩ
10 20 30
Installed loca-
tion
Internal unit (see
page 96)
External unit
(see page 98)
Further sensors
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Troubleshooting
Connection
Controller and
sensor PCB (see
page 49)
Refrigerant circuit
control (observe
label on the exter-
nal unit)
103