Viessmann VITODENS 300-W Technical Manual page 17

Vitodens 222-W
(cont.)
497
HV HR GA KW WW
E
A
SIV
172
300
420
520
600
A Condensate drain
E Drain
GA Gas connection
HR Heating return
Rated heating output
kW
3.2 - 19.0
5.2 - 35.0
Note
For connection dimensions for installation on finished walls with pre-
plumbing jig, see page 59.
For connection dimensions for installation on unfinished walls with pre-
plumbing jig, see page 60.
Note
Lay all required supply cables on site and route them into the boiler at
the point indicated (see page 52).
Variable speed heating circuit pump in the Vitodens 222-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
via an internal data BUS to the circulation pump.
VITODENS
a
A
35
92
480
Dim. a
mm
143
168
HV Heating flow
KW Cold water
SIV Safety valve on the DHW side
WW DHW
Finished wall
HV HV HR GA KW WW
Individually match the minimum and maximum speeds 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") and the maximum pump rate (coding address "E6") are set to
the following values:
2
VIESMANN
17