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In order
to find where to drill the holes for the Branch-lines into the plates,
establish a reference point for the Inlet Valve by measuring from the
center of the intended Inlet Valve location to the nearest corner of
the room in which the inlet is to be located. Find this corner from
the attic by peeling back the insulation to expose the top plate.
Measure
the same distance you measured below from where the top plates form
that corner (Illustration 1)
You should now be in a straight vertical line directly above the Inlet
Valve location.
Remember whether you measured your reference point from the inside or
outside corner.
Drill
a 2 1/2" hole into the center of the top plate. After you have
completed this, you can visually re-check, with the use of a flashlight,
that the space between the studs is free of obstruction.
As our
illustration shows, you will be working in a confined space with very
little head room. Use any number of extension drill bits to enable you
to get to the intended location of the Inlet Valves. (See illustration
2).
Measure
and cut pipe from the plate to Inlet Valve hole below and feed pipe
through hole into space between wallboard.
It is important
that you have all the necessary tools with you in the attic to save
you avoidable trips through the small access openings, through which
attics are commonly accessible. (see illustration 2)
If, due
to lack of adequate vertical space, the entire length of pipe can't
be inserted in one piece, then shorter sections can be cut and glued
together with the use of couplings and fed into the hole in the top
plate section by section until it reaches the inlet valve opening. (see
illustration 3)
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Illustration
1
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Illustration
2
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Illustration
3
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Note:
IT IS EXTREMELY IMPORTANT TO VERIFY THAT THE WALL DOES NOT CONTAIN ANY
ELECTRICAL CONDUCTORS WHICH MAY INTERFERE WITH THE DRILL BIT
Follow
steps 5 through 9 of the Mounting Plate Installation Diagram for the
installation of Mounting Plates and Inlet Valves.
YOU
ARE NOW READY FOR THE INSTALLATION OF THE MAIN-LINE.
The Main-line connects the entire System from the Inlet Valves
to the Power Unit. It carries the Low-Voltage Wire along its entire
run. During the layout-process you checked carefully for possible obstructions
along the intended run, such as double joists, ducts, electrical wiring
or water lines. Bypass these obstructions as per our illustrations.
Glue Main-line
fittings to the exposed Branch pipes above the plates. Make sure each
fitting points in the direction of the Power Unit. Measure and cut the
pipe-lengths for the Main-line and glue into hubs of fittings leading
from Branch to Branch. Apply glue to both the end of the pipe and to
the inside of the hub then twist pipe into hub until firmly seated.
Glue will set instantly.
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Illustration
4
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Fasten
Low-Voltage Wire to Pipe-run with Cable Ties approximately every 6'
and at each Ell. This will prevent drooping, possible damage to wire
insulation or ripping. Electrical tape may be used if double-wrapped
around wire and pipe. For the proper way of Splicing revert back to
our section on Wiring.
The finished
installation shown in the illustration shows an air vent obstructing
an intended Branch-line ( Illustration 4, dotted line).
A 45"
wye can be advantageously utilized to by-pass this and similar obstructions
by installing the wye into the Main-line further downstream.
The use
of a 45" wye will save you the additional installation time of
two extra fittings.
The 180"
"Loop" shown is further explained in illustration 11.
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