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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
External Tank –
When the external tank
is switched to ‘Yes’, this allows the
Vitotrans 300 to be set up for operation
with an external DHW storage tank
(See the recommended system layouts -
starting on page 8).
When the ‘external tank’ function is set in
the ‘yes’ position, the tank loading pump
output is activated. The tank loading
pump is connected to the control as
shown on page 25.
The option for a building DHW
recirculation pump and sanitation function
will also become available and display on
the
Settings
+
screen.
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.
Installation
Instantaneous
DHW DHW Storage Tank
Units
– The Units switch can be toggled to
change between Imperial units (ºF / GPM)
and Metric units (ºC / L/min.).
DHW Setpoint
– This is the DHW setpoint
adjustable from 100ºF to 190ºF (38ºC to
88ºC). Drag the slider to adjust the DHW
setpoint.
DHW Min Activation Flow
– This is the
minimum flow rate of domestic water that
is required to activate the Vitotrans 300.
This is adjustable from 5 GPM to 30 GPM
(19 L/min to 114 L/min). Drag the slider to
adjust the DHW min. activation flow.
Comfort mode
When the Vitotrans 300 is in standby,
this function will run the internal system
pump at a constant minimum speed.
This function can be used with a heating
system or boiler that is set up to maintain
a certain minimum system temperature.
This is to ensure that hot water is always
available at the Vitotrans 300 and that
DHW can be produced without delay.
