88
Sensor
Captur-
ing ele-
ment
Installed loca-
tion
Connection
■ Temperature sensor, refrigerant
inlet, evaporator (OCT)
■ Temperature sensor, evaporator
(OMT)
■ Temperature sensor, air intake,
evaporator (OAT)
NTC
10 kΩ
External unit
(see page 83)
Refrigerant circuit
control (observe
label in the exter-
nal unit)
■ Temperature sensor, compres-
sor head (hot gas) (CTT)
NTC
50 kΩ
External unit
(see page 83)
Refrigerant circuit
control (observe
label in the exter-
nal unit)
Temperature sensors in the internal unit (with identification label)
Viessmann NTC 10 kΩ (blue identifi-
cation label)
Outside temperature sensor
100
10
-20 -10 0 10 20 30
Temperature in °C
6
8
20
40
60
80
200
Resistance in k
Ω
Further sensors
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance in k
Ω
Troubleshooting
Repairs
(cont.)
5782 176 GB
