PEX Installation Manual

37
IM-PF 724596 0416
14 Installing Manifold Distribution Lines
Self-adhesive labels are supplied with the ManaBloc.
Mark tubes pulled as a bundle or those not connected
immediately at both ends with a permanent marker to
designate the fixture supplied.
14.1 Installing manifold distribution lines
Run distribution lines continuously in the most direct
route from the ManaBloc to the xtures.
A distribution line may contain a coupling or other
tting for purposes such as repairing a damaged section
of tubing, handling a change of direction that cannot
be made within the minimum bend radius guidelines,
accommodating a xture location change that requires a
longer line or supplying a low-demand accessory (i.e., ice
maker). However, several pieces of shorter tubing should
not be connected with ttings for the purpose of using
up leftover lengths of tubing.
NOTE: It is the responsibility of the installer to
ensure that further construction, nishing and other
mechanical system installations do not compromise
the ManaBloc plumbing system as installed according
to these instructions.
1. Tubing coils are usually placed at the ManaBloc
location and tubing is pulled to the xture through
stud cavities, holes drilled overhead in oor joists,
etc. Several tubes may be pulled at one time. Viega’s
color-coded ViegaPEX Ultra tubing helps prevent
cross-connections.
2. Do not pull tubing tightly. Some slack (7" per 50
feet) is necessary to accommodate expansion and
contraction. Leave enough excess tubing at the
beginning and end of runs to make connections
without putting strain on the tubing.
3. Exercise care when pulling PEX tubing to prevent
cutting or abrading. Take care to prevent kinking of
the coiled tubing. If kinking or cutting occurs, cut
out the damaged section and install a coupling.
4. For the best results, connect the distribution
lines to xtures and the ManaBloc immediately
upon installation. Label the end-use xture on the
ManaBloc cover plate next to the port.
5. Since plumbing xtures are generally located in
groups, and there may be several ViegaPEX Ultra
distribution lines running to approximately the same
location, it is easiest to run these distribution lines
bundled together.
For a neat appearance, tie bundles with nylon ties
(part number 43714 or 43701 or plastic strapping at
regular intervals).
NOTE: Bundles shall be sufficiently tied for tubing
support but shall NOT restrict tubing expansion
and contraction caused by temperature variations.
CAUTION: DO NOT USE DUCT TAPE
FOR BUNDLING. Duct tape will not permit
tubing movement.
6. Bundles can be supported with hangers
designed for larger tubing sizes.
7. The nylon ties can be used
to support PEX lines directly
from wooden framing
members.
Any plastic cable ties capable
of supporting the weight of
the tube or bundle when lled
with water can be used.
8. Holes drilled through studs,
joists, plates, headers, etc.,
must be large enough to
accommodate tubing bundles
without binding to allow free
movement. Several smaller
holes (accommodating a few
lines each) may be preferable
to drilling a bundle-size hole.
In no case should the hole size
exceed building code guidelines,
as this could weaken the structural
support members.
For more detailed instructions, refer to Section 15 of
this guide.