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Vitodens 200-W B2HA 88-150, 311- 530 Technical Data
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 14 psi (1.0 bar).
The boiler water temperature is limited to 185ºF (85ºC)
for models 88 to 530.
To minimise distribution losses, we recommend that
you size the heat distribution system to a max. supply
temperature of 158ºF (70ºC).
Installation Examples
Please note that in the following piping layout examples, all pumps are field supplied.
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.
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.
To reduce burner cycling in low energy houses with a
correspondingly low heat demand, we recommend the
use of a low loss header.
IMPORTANT
DHW supply and return piping between boiler DHW
connections and the Viessmann DHW tank connections,
shall be a minimum of 1b in. (for models B2HA 88-100,
311-352) and 2 in. (for models B2HA 112-150, 399-
530) 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.
Installation
35
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