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Installation
General Installation Information
WARNING
If a DHW storage tank is used, the installer must verify
proper operation of the tank temperature sensor with
the original manufacturer of the tank.
Viessmann strongly recommends the installation of a
thermostatic tempering valve in the DHW supply line.
IMPORTANT
The examples on the following pages depict possible
piping layouts of the Vitotrans 300, equipped with
Viessmann System Technology.
For system 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.
Proper installation and functionality in the field is the
responsibility of the heating contractor.
Connecting to the Heating System - Supply and Return
Branch off from main heating
system supply and return.
Legend
A Vitotrans 300
B Vitotrans supply
C Vitotrans return
D Heating system supply
E Heating system return
8
Vitotrans 300 Installation, Operating and Service
The schematics on the following pages are to be used
as guidelines only. They do not display all system
varieties, safety devices, or concepts possible. Specific
system layouts may be further discussed with the local
Viessmann sales representative office.
Clearances
A minimum of 2 in. (51 mm) circumferential clearance
from non-insulated hot water pipes to combustible
construction must be maintained. In cases where the
pipes are insulated with pipe insulation of sufficient
thickness and insulation values, the above clearance
may be reduced to 0 in. (refer to local codes).
Note: In the following piping layout examples all pumps
are field supplied.
Install isolation valves in all heating, domestic piping
and recirculation piping as necessary to service all
equipment properly (e.g. pumps).
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.
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