Checking The Temperature Sensors - Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors

Maintenance
Draining heat pump on the secondary side
1. Close the on-site boiler drain and fill valve.

Checking the temperature sensors

For PCB locations in the heat pump: See page 64.
Sensor
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor, top (F6)
■
Cylinder temperature sensor, bottom (F7)
■
Flow temperature sensor, heating circuit with mixer
■
M2/HC2 (F12)
System flow temperature sensor (F13)
■
Flow temperature sensor for cooling circuit: Heating
■
circuit without mixer A1/HC1 or separate cooling cir-
cuit SKK (F14)
Room temperature sensor, cooling circuit (F16)
■
Boiler water temperature sensor, external heat gener-
■
ator (F20)
Room temperature sensors for heating circuits
■
Return temperature sensor, primary circuit (F3)
■
Flow temperature sensor for secondary circuit (T1)
■
Flow temperature sensor for secondary circuit, up-
■
stream of instantaneous heating water heater (T2)
Secondary circuit return temperature sensor (T3)
■
Suction gas temperature sensor (T4)
■
Flow temperature sensor for primary circuit (T5)
■
Hot gas temperature sensor (T6)
■
Liquid gas temperature sensor (T7)
■
66
2. Draining the heating water side
Connect the hose to the secondary circuit drain &
fill valve: See chapter "Internal components" on
page 65.
Open the secondary circuit drain & fill valve.
For sensor locations in the heat pump: See page 65.
Test element
Viessmann NTC 10 k
Ω
(blue marking)
Viessmann Pt500A (green
marking)
NTC 10 k (no marking)
Ω
Connection
Controller and sensor PCB
Controller and sensor PCB
EEV PCB