Viessmann Vitocal 300-G Series Installation And Service Instructions Manual page 65

Checking the sensors
Sensor
Outside temperature sensor (F0)
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Buffer temperature sensor (F4)
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Cylinder temperature sensor, top (F6)
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Cylinder temperature sensor, bottom (F7)
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Flow temperature sensor, heating circuit with mixer M2/HC2 (F12)
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System flow temperature sensor (F13)
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Cooling circuit flow temperature sensor (direct heating circuit A1/HC1 or separate cool-
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ing circuit SKK) (F14)
Room temperature sensor, cooling circuit (F16)
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Boiler water temperature sensor, external heat generator (F20)
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Room temperature sensors for heating circuits
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Flow temperature sensor, primary circuit (F2)
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Return temperature sensor, primary circuit (F3)
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Flow temperature sensor, secondary circuit, in a 2-stage heat pump for heat pump
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stage 1 (F8)
Return temperature sensor, secondary circuit, in a 2-stage heat pump for heat pump
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stage 1 (F9)
Secondary circuit return temperature sensor for heat pump stage 2 (F18)
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Secondary circuit flow temperature sensor for heat pump stage 2 (F27)
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Sensors in the refrigerant circuit
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(cont.)
Maintenance
Test element
NTC 10 k
Ω
Pt500A
(PTC)
65