Multi Boiler Systems - Viessmann VITODENS 200-W Type B2HA Technical Manual

Design information

Multi boiler systems

We recommend the installation of a low loss header in multi boiler
systems. For this, order the low loss header that is available as an
accessory. See page 57 and the Viessmann pricelist.
Losses resulting from the use of third party low loss headers are
excluded from our liability.
On-site safety equipment should comply with EN 12828.
As an alternative to the low loss header, a suitably sized plate heat
exchanger may be used to provide system separation. In this case,
the flow temperature sensor should be arranged on the secondary
side of the plate heat exchanger. See the following system example.
4
A Flow temperature sensor
Max./min. flow rates Vitodens 200-W
Note the provided flow rates when using the heating circuit connec-
tion set without integral low loss header. Take measures on the sys-
tem if these values are exceeded or not met.
Boiler
Vitodens 200-W, 49 and 60 kW
Vitodens 200-W, 69, 80 and 99 kW
Vitodens 200-W, 120 kW
Vitodens 200-W, 150 kW
Boiler
Vitodens 200-W, 49 and 60 kW
Vitodens 200-W, 69, 80 and 99 kW
Vitodens 200-W, 120 and 150 kW
For installation designs in conjunction with connection sets with inte-
gral low loss header: See www.viessmann-schemes.com.
4.4 Intended use
The appliance is intended solely for installation and operation in
sealed unvented heating systems that comply with EN 12828, with
due attention paid to the associated installation, service and operat-
ing instructions. It is only designed for heating up heating water that
is of potable water quality.
Intended use presupposes that a fixed installation in conjunction with
permissible, system-specific components has been carried out.
VIESMANN
76
(cont.)
M M
A
Max. flow rate
l/h
3500
5700
7165
8600
Min. flow rate
l/h
450
1300
3600
Information on the plate heat exchanger
■ Provide air vent valves (e.g. quick-action air vent valves) on the
primary side (boiler side) and the secondary side (heating circuit
side) of the plate heat exchanger.
■ Flush existing heating systems thoroughly before fitting the plate
heat exchanger. The use of a sludge separator is recommended.
■ Fit the flow temperature sensor into the flow connection on the
secondary side, as shown in the diagram. Connection elbows with
integral sensor well are available as accessories.
■ Set the circulation pumps in the boiler connection sets to
ΔP constant and max. pump rate.
■ The connection of several plate heat exchangers is not recommen-
ded.
Sizing the plate heat exchanger:
■ The pressure drop in the plate heat exchanger must be lower than
the lowest pressure drop of connected heating circuits.
■ Fit a dirt trap on the secondary side of the plate heat exchanger.
■ When sizing, take the temperature differential of the plate heat
exchanger into account.
Heat generator circuit
The circulation pump in the Vitodens must be able to supply the
required water volume against the (mostly low) pressure drop of the
heat generator circuit; the pressure drop of the low loss header is
negligible. Subject to the water volume circulating in the heat gener-
ator circuit, the respective residual head may be determined for siz-
ing the internal pipe diameters using the pump diagram; alternatively
the high efficiency circulation pumps can be adjusted accordingly.
Heating circuit
The heating water pumps to be installed on site must be able to
deliver the water volume in the heating circuits against their pressure
drop, and must be sized accordingly.
Low loss header with distributor/manifold for multi boiler sys-
tems with Vitodens 200-W
For description and specification, see page 57.
Commercial or industrial usage for a purpose other than heating the
building or DHW shall be deemed inappropriate.
Any usage beyond this must be approved by the manufacturer in
each individual case.
VITODENS 200-W