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Installation Examples
Installation of heating circuits:
- radiator heating circuit (high
temperature circuit)
- underfloor heating circuit with 3-way
mixing valve (low temperature circuit)
- DHW production with the following
flow conditions:
The flow rate of the heating circuits is
greater than the maximum possible
water flow rate of the Vitodens 100
boiler.
The use of a low-loss header is
therefore recommended.
A low-loss header is available as an
accessory part.
The radiator heating circuit is supplied
by a circulation pump (field supplied).
The underfloor heating circuit is
supplied by a circulation pump installed
on site which is controlled by the
extension kit. The DHW pump is field
supplied.
Please note!
The use of a low-loss header is
recommended if the water flow rate is
less than 1.7 GPM / 400 ltr/h or more
than 6.2 GPM / 1400 ltr/h.
The low-loss header is available as
accessory part. See page 36 in this
manual for details on the low-loss
header.
IMPORTANT
DHW supply and return piping between boiler DHW connections and the Viessmann DHW tank connections, shall be a
minimum of 1" nominal pipe diameter (irrespective of the ¾" DHW connection outlet sizes provided on the boiler and the
DHW tank). This will ensure pump head 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 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.
(continued)
Note 1
Optional high limit safety control of
heating circuit E.
(During DHW production with ST
terminal activated, the boiler supply
temperature will be set automatically
to 78ºC / 172ºF.
The heating system must be protected
from excessive temperature if no
automatic mixing valves are used or no
DHW priority is required.
After the DHW call for heat is satisfied,
there is a 80 seconds pump post purge
time.
Model No.
Vitodens 100-W,
WB1A 8-24
WB1A 8-30
Note 2
The heating circuit pump logic output
of the Vitotronic 050 is used to
energize the T.T. output of PPM.
Therefore, using a room thermostat in
series with RT input of the boiler will
reduce unnecessary calls initiated by
pump logic output of the Vitotronic to
the Vitodens 100 boiler (mixing valve
heating circuit only).
Note 3
During DHW call for heat, there is no
priority on mixing valve heating circuit.
Max. flow rate
(GPM/ltr/h)
6.2/1400
6.2/1400
Boiler Connections
33
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