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Vitotrans 300 Installation, Operating and Service
Single Solar Direct with DHW Storage Tank
Vitotrans 300 with ....
DHW storage tank, for system applications where low
or fluctuating DHW flow rates may occur, to prevent
short-cycling of the system and to provide added
comfort through DHW recirculation.
Solar system for DHW preheat with solar DHW storage
tank.
Legend
A Vitotrans 300
B Water softening equipment
C Back flow preventer
Note: for the type of backflow preventor consult
the local plumbing code requirements.
D Expansion tank - domestic water
E Point of source domestic water tempering valve
F Domestic cold water (DCW)
G Domestic hot water (DHW)
H Tempered DHW building supply
I DHW storage tank
J DHW storage tank circulation pump
K DHW recirculation pump
L Solar DHW storage tank
M Solar tank loading pump
N Heat exchanger
O Solar control unit
P Solar Divicon
Q Solar expansion tank
R Solar panels
S DHW recirculation line from building
Single Vitotrans 300, with DHW storage tank and
integrated solar DHW preheat. The integrated solar
includes using a solar divicon with an external heat
exchanger and solar DHW storage tank with a circulation
pump.
Note: A DHW storage tank is highly recommended for
applications where fluctuating DHW system flow
rates, particularly those flow rates below 30 GPM
(114 L/min) for all Vitotrans 300 models sizes.
The DHW storage tank loading pump should be sized
according to DHW storage tank's size and desired
recovery time, but must not exceed the maximum
flow for the associated Vitotrans 300 model size. It is
recommended that the DHW storage tank loading pump
should provide at least 30 GPM (114 L/m) of flow and be
able to overcome the head losses of the Vitotrans 300
and the piping connecting it to the DHW storage tank.
The minimum flow activation setting for the Vitotrans
300 can be set between 5 and 30 GPM (19 and 114 L/m)
when used with a DHW storage tank. When determining
the activation setpoint, consider the size of the DHW
storage tank and the anticipated minimum constant DHW
draw rate (based on usage patterns). It is also important
to identify the minimum output of the heating system and
use this as a factor when choosing a sufficient activation
setting. This will help reduce short cycling of the heating
equipment.
Note: It is the responsibility of the system designer
to ensure the sizing of the tank loading pump
and corresponding DHW storage tank are sized
for the required demand.
Installation
15
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