Onix Tubing Installation Manual

Watts Radiant: Onix Installation Manual page 21
the Onix off the unwinder and loosely
attach it to the first barb of one of the
manifolds. Take a white paint pen, or
other marker, and mark this end of
Onix with a number 1, indicating the
first circuit installed. Do the same to
the other end of Onix, marking it with
the number 1. This will help later in
the installation process.
Do not push the Onix on more than
the first barb at this point, just in case
the circuit needs to be moved. Pull the
free end of the Onix from the
unwinder and fold the circuit in the
middle to form a loop. Pull the loop
(mid point of the circuit) through the
series of pre-drilled holes to the last
joist bay. Continue to pull the loop
down the bay until the loop is 8" from
the end.
When looking at the Onix in the first
bay, one side will be fixed . This side
is the side that is attached to the mani-
fold. Staple this side of the tubing
first, then staple the free side. This
will allow any excess tubing that may
have been pulled to be pushed back
over to the next bay. Make sure to
staple the Onix every 6"—8" on center.
Staples placed farther apart than 8"
can cause the Onix to pull away from
the subfloor, resulting in a reduction in
heat transfer to the subfloor.
Continue, moving from bay to bay
until all of the Onix is used. Stop
when the free end of Onix that is still
on the unwinder slips off. Take the
free end and attach it to the return
manifold.
It is always a good idea to connect the
circuits to the manifolds in reverse
return pattern, i.e. the first water in,
is the last water out.
Step 6:
Repeat With The Next Circuit
Repeat steps 4 through 6, keeping the
new series of joist holes at least 8"
away from the first to maintain struc-
tural integrity of the joist. Pull the
Onix down to the first open bay, gen-
Attach one end of the Onix to the
supply manifold.
Leave one end of the Onix on the
unwinder and pull from this end.
Use a chalk line to align drill holes.
Loop the Onix and pull the
loop through the drilled
joists.
Pull the Onix down the far joist bay
and space the tubing according to
design.
Repeat until the Onix comes off the
unwinder. Attach the free end to the
return manifold.
Make sure to use all of the Onix tubing
specified for the zone. Do not cut cir-
cuits to make them shorter as an imbal-
ance in flow may occur
Staple-Up
Typical Onix Staple-Up.