Weil-McLain AlumniPEX Radiant Heater - Manual (Page 7)

Above Floor Installation Guide
Part Number 650-000-221/0298 7
B. Obtain Tube Layout Drawing
1. Do not start a radiant heating installation without a
detailed tube layout drawing.
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It provides critical information on:
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tube routing
• tube lengths
• areas to be avoided
• materials needed
2. Figure 3 includes the information and drawing detail
for a typical tube layout drawing.
3. A complete, accurate drawing of the tube layout is the
most important key to a successful job.
Floor Plan/Layout Should . . . . . . . . . .
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Be drawn to scale using a CAD program so tube
lengths can be calculated by the program.
Show complete floor plan, including all
appliances, cabinets, fireplaces and any other
details which could affect the routing of the
tubing.
Show complete layout of all circuits.
Provide length of each circuit, including leader
length.
are the tubing runs connecting
from the room circuits to the manifold(s).
Show tube spacing and flow directions.
State finished flooring assumed for each space.
Leaders
The heating system designer may add an
allowance to the total length to account for
variations in actual installation. This might range
from 3 to 10% depending on the type of
installation. In the example shown at left, the
designer used a length allowance of 10 feet.
Note Tube Routing
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Run leaders (connecting tubing from manifolds to
circuits) through hallways.
Run leaders and tubing under doorways.
Avoid running under walls to reduce chances of
damage from fasteners.
Mark the framing above where tubing runs under
walls so all trades will be aware.
If tubing must penetrate a firewall, follow local
codes regarding sleeving and fire stopping
requirements.
DO NOT Run Tubing:
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Under cabinets, refrigerators, ranges, freezers.
These items "block" the heat and the tubing would
be wasted.
Within 8 inches of toilet flanges. The wax ring
seal may soften and fail from the heat.
Under fireplaces, ovens, appliances or other heat
sources.
Closer than 4" from walls.
Closer than 6" from appliance vents or flues.