Viessmann Vitodens 300-W Technical Manual page 26

Vitodens 300-W
Vitodens 300-W, 4.0 to 35 kW
168
KAS
D
3
380
Compulsory in conjunction with DHW cylinders below the boiler;
A
otherwise recommended.
Installation on finished walls
B
Installation on unfinished walls
C
Height in combination with balanced flue bend 60/100. In
D
combination with balanced flue inspection bend 60/100, the
height is reduced by 10 mm.
ADG Expansion vessel connection G ¾
Note
For connection dimensions for installation on finished walls with pre-
plumbing jig, see page 60.
For connection dimensions for installation on unfinished walls with
pre-plumbing jig, see page 66.
For connection dimensions for installation with a mounting frame,
see page.
Note
Prepare all connections on site before commencing the boiler instal-
lation.
Lay all required supply cables on site and route them into the boiler
at the point indicated (see page).
Variable speed heating circuit pump in the Vitodens 300-W
The integral circulation pump is a highly efficient pump with substan-
tially lower power consumption than conventional pumps.
The pump speed and consequently the pump rate are regulated sub-
ject to the outside temperature and the switching times for heating or
reduced mode. The control unit transmits the current default settings
to the circulation pump via an internal data bus.
VIESMANN
26
(cont.)
ADG
B
SVL
SRL
HV GA HR
302
370
480
OKFF
240
C
E
110
177
240
ATR Drain outlet connection
E Drain
GA Gas connection
HR Heating return
HV Heating flow
KAS Boiler flue connection
OKFF Top edge, finished floor
SRL Cylinder return
SVL Cylinder flow
Finished wall
HV SVL/ GA SRL/
WW
The control unit parameters can be used to match the minimum and
maximum speeds and the speed for reduced mode to the existing
heating system.
In the delivered condition, the minimum pump rate (coding address
"E7") and the maximum pump rate (coding address "E6") are set to
the following values:
240
ADG
SVL
SRL E
HV GA HR ATR
65
110
177
240
302
370
480
OKFF
HR
KW
VITODENS