Viessmann VITOCROSSAL 300 Installation Instructions Manual page 23

Vitocrossal 300 CU3A 26 to 57 Installation
Condensate Connection
Legend
A Condensate drain (must be able to be inspected)
B Open or vented field supplied drainage system
Note: If the boiler is installed even with the ground,
install a condensing drain above the ground max.
2 in. (50 mm).
Boiler water return temperature
Note: The 'amount of condensate" and the "flue gas
temperature gross" graphs are independent of
each other.
(continued)
1. Install the condensate drain pipe with a suitable
2. Discharge condensate from the boiler into the drain
Do not connect the drain pipe from any other appliance,
such as a water softener backwash pipe, to the
Vitocrossal 300 CU3A condensate drain pipe.
Pipe ventilation must take place between the siphon trap
and the neutralization unit (if applicable).
Always connect the siphon to prevent flue gas from
escaping into the space.
Connection (external):
The amount of condensate to be expected during the
operation of the boiler and can be read from the chart.
If the condensate outlet of the Vitocrossal 300 CU3A
boiler is lower than the drain, a condensate pump must
be installed. Select a pump which is approved for
condensing boiler applications. To avoid condensate
spillage, select a pump with an overflow switch.
The drain connection must terminate into an open or
vented drain as close to the boiler as possible to prevent
siphoning of the boiler drain.
gradient.
system, either directly or (if required) via a neutralization
unit (accessory).
IMPORTANT
IMPORTANT
IMPORTANT
c in. (19 mm) barb fitting
7
Boiler Connections
23