Technical Manual

Technical Data
Legend
IO Inspection and clean-out opening
D Drain
BWR Boiler water return (upper coil)
SCR Solar collector return (lower coil) or
boiler return
BWS Boiler water supply (upper coil)
SCS Solar collector supply (lower coil) or
boiler supply
DCW Domestic cold water
SW1 Sensor well opening for DHW
tank temperature sensor or boiler
controler aquastat (located at the
same height as BWS (79 USG /
300 ltr only), rotated 20º)
SW2 Sensor well for lower thermometer
at SCS level
DHW Domestic hot water
RT Recirculation tapping
TPV Temperature and pressure relief
valve
*1
For solar heating systems Viessmann
recommends placement of the DHW tank
temperature sensor in the solar collector
return (SCR). This requires a brass elbow
with sensor well (accessory - Part No.
7175 213).
The DHW tank temperature sensor of the
boiler control is placed in SW1.
BWS
k
IO
b
a
c
d
e
f
g
Overall height
h
DHW
RT
BWR
SCS
SCR
DCW/D
*1
Y
TPV
79 USG / 300 ltr Tank
Overall width
Overall depth
m
n
SW1
SW2
*
1
Technical Data
VITOCELL 300-B 5
DHW tank temperature sensor
in solar heating applications
79 USG / 300 ltr
DHW tank temperature sensor for solar
application (included with solar
control unit)
Brass elbow with sensor well
Solar collector return connection
Dimensions
Storage
capacity
USG /
ltr
79 /
300
a
b
c
d
e
f
g
h
k
m
n
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
3½
87
11¾
301
29
2
/
3
751
37½
951
43
1
/
3
1101
54
1369
64
2
/
3
1640
14
357
4
100
29½
751
54
1369
5
1
6
7
4
1
5
-
0
1
5
1
6
7
4
1
5
-
0
1