Viessmann VITOCAL 111-S - Page 87

87
A BC D E
H
G
F
L
K
M
N
O
P
R
S
T
U
W
X
V
Fig. 71
A
Condenser
B
Safety valve
C
Secondary circuit air vent valve
D
Type AWBT(-M)-E/AWBT(-M)-E-AC only:
Instantaneous heating water heater
E
Quick-action air vent valve G ⅜
F
Flow temperature sensor for secondary circuit (F8)
G
Flow switch
H
3-way diverter valve "central heating/DHW heat-
ing"
K
Secondary circuit return temperature sensor (F9)
L
Secondary pump
M
DHW cylinder air vent valve
N
Secondary circuit drain & fill valve
Additionally, in conjunction with solar indirect coil
set: Cylinder temperature sensor
O
Drain and fill valve, DHW side
P
Pressure gauge
R
Type AWBT(-M)-E/AWBT(-M)-E-AC only:
High limit safety cut-out (STB), instantaneous
heating water heater
S
Indoor unit service valve: Schrader valve; can be
used in place of the outdoor unit service valve for
checking the pressure and evacuating the refriger-
ant circuit.
T
Liquid gas temperature sensor (F25)
U
Expansion vessel 10 l
V
Secondary circuit flow temperature sensor
upstream of instantaneous heating water heater
(F3)
W
Reversible suction gas temperature sensor (F24)
X
Indoor unit service valve: Schrader valve; can be
used in place of the outdoor unit service valve for
checking the pressure and evacuating the refriger-
ant circuit.
Maintenance
Indoor unit: Overview of internal components
6199592
Maintenance