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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Installation
Connecting to the Heating System – Direct Boiler Connection
Legend
A
High Mass Boiler (example: CM2)
B
Vitotrans 300
C
DHW Storage Tank
D
Expansion tank
E
System Fill
F
Back Flow Preventor
G
Pressure Guage
H
Safety Relief Valve
I
Domestic Cold Water (DCW)
J
Pressure Reducing Valve
K
Water Softener
The Vitotrans 300 may be connected directly to a hot
water heating boiler when following the system design
considerations below;
- DHW load type (constant load with minimal
fluctuations) – Vitotrans directly connected to the
hot water heating boiler operates optimally with
steady DHW flow or gradual fluctuations to DHW flow
- Thermal mass/water content of the hot water heating
boiler - High mass boilers are typically better suited
for direct connection to the Vitotrans
- Modulation range of the hot water heating boiler
– the boiler should be sized and selected based on
matching the anticipated minimum and maximum
DHW load
- Use with or without a DHW Storage Tank, a DHW
storage tank will absorb small fluctuations in DHW
temperature generated by rapid changes in DHW load
Taking into consideration the points above, the system
designer will be able to optimize the system to ensure
system performance, occupant comfort and longevity of
the system.
The system heat source (boiler) should be set to supply
water to the Vitotrans 300 at least 20ºF (11ºC) higher
than the desired DHW setpoint. It is recommended that
the Vitotrans 300 is connected close to the heat source.
