Marine heating system Installation Instructions
© Webasto Global Comfort Solutions
®
23
• Free flow into the cabins enables the best cabin heating and air circulation.
• Only use one or two outlets per cabin.
• Position of the outlet: close to the floor (best air circulation).
• Choose an outlet color that matches the interior, see the parts catalog.
When using air distributors, the principle applies that air always takes the route of least
resistance. The type and orientation of the distributor has exactly the same effect as the diameter
and flow resistance of the connected air line.
Rough orientation for distributor selection:
Principles of air distribution with branches
9.4.4 Interpretation using resistance points
Optima heat output of an air heating system. Air flows if possible unrestrictedly into the interior.
Air distribution at the intake and outlet sides present a flow resistance so: keep this resistance
as small as possible.
As a reference point for a maximum permissible air flow, air supply components are given so-called
“resistance points” that represent a value of flow resistance. The greater the number of resistance
points an air supply component has, the worse the air flows through it.
The table of resistance points lists common components and their resistance points.
For the complete parts spectrum, see the Webasto
®
parts catalog.
For in-built air supply systems, ensure that the total sum of the resistance points in the main
branch are not exceeded (otherwise there is a risk of the heater overheating or premature
reduction of the heating capacity while the interior has not yet been warmed up.
Air Top 2000 / S / ST
®
max. 325 points.
Air Top 3500 / ST
®
max. 550 points.
Air Top 5000 / ST
®
max. 375 points.
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