8.2 Pellet suction system
The pellet suction system consists of the pellet hose, air hose and a suction turbine. The suction vacuum turbi-
ne in the hopper conveys pellets in the pellet line from the storage room or fabric tank to the hopper.
Key components of pellet suction system
1
Pellet- Suction hose
Line from the storage room auger or fabric tank to the hopper.
2
Pellet- Return air hose
Line from the suction fan to the storage room auger or fabric tank.
3
Suction fan / Vac
turbine
Located beside the hopper behind the Pellet boiler burner housing.
4
T-piece at end of stora-
ge system auger
Located at front end of the storage room auger, outside the storage
room.
5
Suction Metering
Switch
Located underneath the fabric tank.
Pellet boiler
Version A pellet storage room
Version B fabric tank
8.2.1 Assembly of the vacuum system
The pellet hose and the air hose are flexible spiral hoses made out of plastic. A copper braid embedded in the
hose dissapates static charge when properly grounded.
Assembly guidelines
•
Bending radius:
The hose should be as short as possible and with as few curves as possible. Bending radius
may never be smaller than 12 inches.
•
Vertical Lift:
Max difference in height = 10 feet. A difference in height of up to 10 feet can be overcome at
one time.
Larger differences in height must by interrupted with a minimum 4 foot flat section of hose for the pellets.
•
Impact protection / Velocity Control:
The spiral hose can be run no more than 13 feet in a straight line.
Small bends particularly in front of curves reduces the abrasion of the spiral hose by controlling pellet
velocity.
•
Installation in the soil and openings:
When burying hose in the ground, it must be inside a protective pipe
such as electrical conduit that is 4 inch in diameter. This pipe must be sealed and may not make any arc mo-
re than 15°.
•
Hose to be Air Tight:
For trouble free operation, the vacuum system must be 100% air tight at all
connections!
All connection points must be secured with a hose clamp.
•
Grounding:
The hoses are provided with a copper braid which helps the hose dissipate static charge. In or-
der to ensure this function, copper braid must be connected to a known ground point at each end.
PE 608 USA_FA 2.1
22
Pellet suction system
