Viessmann VITODENS 200-W Technical Manual page 26

Vitodens 300-W
Vitodens 300-W, 5.2 to 35 kW
168
KAS
3
380
A Compulsory in conjunction with DHW cylinders, below. Other-
wise, recommendation only.
B Installation on finished walls
C Installation on unfinished walls
ADG Expansion vessel connection G ¾
ATR Drain outlet connection
E Drain
GA Gas connection
Note
For connection dimensions for installation on finished walls with instal-
lation aid, see page 53.
For connection dimensions for installation on unfinished walls with
installation aid, see page 56.
For connection dimensions for installation with a mounting frame, see
page 57.
Note
Prepare all connections on site before commencing the boiler instal-
lation.
Route all required supply cables on site and lead them into the boiler
at the point indicated (see page 51).
Variable speed heating circuit pump in the Vitodens 300-W
The integral circulation pump is a highly efficient DC pump with more
than 50 % less power consumption than conventional pumps.
The pump speed and consequently the pump rate is regulated subject
to the outside temperature and the switching times for heating or
reduced mode. The control unit transmits the current default speed via
an internal data BUS to the circulation pump.
VIESMANN
26
(cont.)
240
ADG
B
SVL
SRL
SIV
HV GA HR
177
240
302
370
480
OKFF
ADG
C
E
110
HR Heating return
HV Heating flow
KAS Boiler flue connection
OKFF Top edge finished floor
SIV Safety valve
SRL Cylinder return
SVL Cylinder flow
Finished wall
HV SVL/ GA SRL/
WW KW
Individually match the minimum and maximum speed plus the speed
for reduced mode to the existing heating system using the control unit
codes.
In the delivered condition, the minimum pump rate (coding address
"E7") is set to 30 %. The maximum pump rate (coding address "E6")
is set to the following values:
240
SVL
SRL
SIV
HV GA HR
ATR
E
65
110
177
240
302
370
480
OKFF
HR
VITODENS