Vitodens 200-W, B2HA 19 to 80 Technical Data
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Installation
Installation Examples
Please note that in the following piping layout examples all pumps are field supplied.
IMPORTANT
IMPORTANT
The examples on the following pages depict possible
piping layouts of the Vitodens 200-W boiler equipped
with Viessmann System Technology.
For boiler and tank combinations, please install only
feasible combinations listed in the Viessmann Price List.
Please note that the following examples are simplified
conceptual drawings only!
Piping and necessary componentry must be field verified.
A low water cut-off (LWCO) must be installed where
required by local codes.
Proper installation and functionality in the field is the
responsibility of the heating contractor.
DHW supply and return piping between boiler DHW
connections and the Viessmann DHW tank connections,
shall be a minimum of 1” nominal pipe diameter (for
models B2HA 19 to 35) or 1¼” (for models B2HA 45 to
80) DHW connection outlet sizes provided on the boiler
and the DHW tank). This will ensure the residual head of
the field supplied pump is fully utilized to overcome the
resistance of the DHW heat exchanger coil and to provide
sufficient water flow to the boiler heat exchanger.
In non-Viessmann DHW tank applications, perform, in
addition to the above, accurate calculations for DHW
tank coil pressure drop versus boiler pump (field supplied)
residual head to ensure sufficient water flow to the boiler
heat exchanger. Failure to heed the above instructions
may cause boiler short-cycling and inadequate DHW
supply.
WARNING
If a DHW storage tank other than a Viessmann
Vitocell 100 or 300 tank is used, the installer must
verify proper operation of the Viessmann DHW tank
temperature sensor with the original manufacturer
of the tank. Viessmann strongly recommends the
installation of a temperature tempering valve in the
DHW supply line.
Hydraulic Connection
System design
Viessmann condensing boilers can generally be installed
in any pumped hot water heating system (closed system).
The circulation pump is an integral part of the appliance.
Minimum system pressure 15 psi (1.0 bar).
The boiler water temperature is limited to 180º F (82º C).
To minimise distribution losses, we recommend that
you size the heat distribution system to a max. flow
temperature of 158º F (70º C).
For apartments with less than 860 ft
2
(80 m
2)
living
space or for low energy houses with low heat demand
we recommend, due to the immediate capturing of the
room-influencing factors, the utilisation of the Vitodens
with a constant temperature control unit in conjunction
with the Vitotrol 100.
To reduce burner cycling in low energy houses with a
correspondingly low heat demand, we recommend the
use of a low loss header.
