Viessmann VIESMANN VITOLIGNO 300-H Technical Manual page 50

Fuel storage
(cont.)
Pellet silo type 17/29 and 21/29
2900
A Max. load on the central support plate: 4000 kg
B Max. load per support plate: 1500 kg
Discharge unit
Subject to the fuel supply system, a discharge unit is required for each
pellet silo (see Vitoset pricelist).
Discharge unit for vacuum system with suction wand
Part no. 7164 633
Fire protection
No special requirements are specified for walls, ceilings, doors or the
utilisation of the room for storage capacities of less than 6.5 t of pellets.
The pellet silo can be installed in the same room as the boiler subject
to the heating system being rated up to 50 kW. In such cases, maintain
a minimum clearance of 1 m. This distance can be reduced if a non-
combustible heat protector is installed between the boiler and the pellet
silo.
Design information
7.1 Sizing the system
7
Selecting the rated heating output
Select the solid fuel boiler according to the required heat load. The
boiler should always be operated in conjunction with a buffer cylinder
(management). The correct system design point therefore does not
depend on the nominal load specification (i.e. the building heat load),
but rather on the required duration of use (length of the heating season,
heat demand).
Flow temperatures
To minimise distribution losses we recommend sizing the heat distri-
bution system and the DHW heating in line with a maximum flow tem-
perature of 70 °C.
VIESMANN
50
1450
Pellet silo Type 17/29
a in mm 850
b in mm 1700
Filling
The space requirement for the fill and return air connectors is at least
600 mm to enable easy connection of the tanker fill hose. The pellets
should be filled through a window or door. If that is impossible, the
connectors can also be extended to the external wall.
Requirements of the fuel storage room are subject to national or
regional regulations and must be complied with.
a TRVB H118 specifies that the pellet silo is separated from the
boiler by a wall and is installed in a separate room. The ceiling and
walls of the fuel storage room must have a fire rating of F90. Doors
between boiler room and flue store, as well as doors and windows to
the outside must meet standards T30 or G30.
In legal terms, fire safety in Austria is regulated by the various national
building regulations of the individual states; the foundation for these
regulations is TRVB H118. Requirements specified in national building
regulations must be observed.
Note
For locations higher than 1800 metres above sea level, the project
enquiry must include details about the precise geographical location
(altitude and address of the location).
On solid fuel boilers supplied with a boiler control unit, the maximum
boiler water temperature is limited to 85 °C. The flow temperature may
be increased by adjusting the temperature controller.
Type 21/29
1050
2100
VITOLIGNO 300-H