Viessmann Vitocal 222-A - Overview of internal components: Indoor unit

81
A
B
M
H
L
N
D
G
E
C
K
O
F
Fig. 65
A
Instantaneous heating water heater
B
Quick-action air vent valve G ⅜
C
Secondary circuit flow temperature sensor (F8)
D
Air vent valve, secondary circuit
E
3-way diverter valve "Central heating/DHW heat-
ing"
F
Safety valve
G
Flow switch
H
Secondary pump
K
DHW cylinder air vent valve
L
Secondary circuit drain and fill valve
Additionally, in conjunction with solar indirect coil
set: Cylinder temperature sensor
M
Drain and fill valve, DHW side
N
High limit safety cut-out (STB), instantaneous
heating water heater
O
Secondary circuit return temperature sensor (F9)
Maintenance
Overview of internal components: Indoor unit
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Maintenance