Checking Sensors - Viessmann Vitocal 350-G Installation And Service Instructions Manual

Troubleshooting
Maintenance
M Drain valve on the secondary side
N Circulation pump for cylinder heat-
ing (accessory for
type BW/WW 351.A07, installation
outside the heat pump) with check
valve
O Secondary pump (accessory for
type BW/WW 351.A07, installation
outside the heat pump) with check
valve
Draining the heat pump on the primary/secondary side
1. Shut off the connection to the heating
network.

Checking sensors

Sensor
■ Outside temperature sensor (F0)
■ Flow temperature sensor, heating
circuit M2 (F12)
■ Cooling circuit flow temperature
sensor (direct heating circuit A1/
HC1 or separate cooling circuit
SKK) (F14)
■ Room temperature sensors
■ Buffer temperature sensor (F4)
■ Cylinder temperature sensor (F6)
■ Flow/return temperature sensor,
secondary circuit (F8/F9)
■ System flow temperature sensor
(F13)
■ All sensors inside the heat pump
■ Boiler water temperature sensor,
external heat source (F20)
128
(cont.)
P Air vent valve, secondary side
Q Low pressure sensor EEV
R Suction gas temperature sensor
S Safety high pressure switch
T High pressure sensor EEV
U Filter dryer
V Primary circuit return temperature
sensor (heat pump brine outlet)
W Drain valve, primary side
X Hot gas temperature sensor
2. Drain heat pump at drain valve on pri-
mary/secondary side (see
page 126).
Captur- Installed lo-
ing ele- cation
ment
Ni500 see page 126
Pt500
Connection to
Controller and
sensor PCB
(see page 91)