System Design Considerations; Burner Calibration; 2-Stage Burner; Fully Modulating Burner - Viessmann Vitorond 200 VD2 Series Technical Data Manual

Vitorond 200, VD2 Series 320 to 1080 Technical Data

System Design Considerations

Burner calibration

With 2-stage and fully modulating burners, ensure
that the chimney is compatible with the lower flue gas
temperatures associated with partial load conditions set
on the burner.

2-Stage burner

When used with the or Vitotronic control, the following
minimum heating outputs are applicable to protect the
boiler:
- 60% of outputs stated in the Technical
Data table on page 5.

Fully modulating burner

The minimum boiler water temperature is:
- 140°F (60°C) with oil,
- 149°F (65°C) with natural gas.
Set the return temperature elevation system to maintain
a minimum value of 127°F (53°C).

Venting

The Vitorond 200, VD2 boiler is approved as a Category I
appliance and must be vented accordingly.
CAUTION
The Vitorond 200, VD2 boiler is not approved for side
wall venting.

Chimney

For proper operation of the Vitorond 200, VD2 boiler,
all products of combustion must be safely vented to
the outdoors, while ensuring that flue gases do not cool
prematurely.
It is critical that the chimney system be properly designed
to handle the relatively cool flue gas temperatures
produced by the Vitorond 200, VD2 boiler.
If the chimney system lacks sufficient insulation and/or
the chimney diameter is too large, corrosive and damaging
condensation will result due to flue gases cooling too
quickly. If a calculated chimney diameter lies between two
values, the larger diameter should be selected.
The chimney connection length between the boiler vent
pipe collar and the chimney must be installed with
insulation.
Vent pipe collar diameter does not automatically
indicate vent/chimney size.
We recommend consulting a reputable chimney installer
for advice in project-specific circumstances.
When installing the Vitorond 200, VD2 boiler,
it is necessary to install a barometric draft regulator
in the chimney/vent for proper operation of the boiler.
Install the barometric draft regulator within 5 to 7 ft.
(1½ to 2 m) from the breeching outlet located at the
rear of the boiler.
Standard Equipment
15