Installation Guide

33
Manifold Stations
can be run into the lower control area without removal of the polyethylene jacket. If the re-
place is vented, it is suggested to remove the yellow jacketing inside the re box to prevent
direct ame contact with the jacket.
If installing HOME-FLEX® through sheet metal enclosures (as commonly used for deco-
rative replaces), it is recommended to leave the protective yellow jacketing in place
through the penetration. HOME-FLEX® should be secured to the building structure outside
the replace to limit motion after installation. Installations that may lead to abrasion of
HOME-FLEX®, such as vibration from a fan in the replace assembly, require a short piece
of Flexible Protective Conduit or PVC pipe to insulate the HOME-FLEX® from the enclosure.
4.7 Manifold Stations
In elevated pressure systems (typically installed in a parallel arrange-
ment), it is recommended to use a central manifold and regulator
station to take best advantage of regulator capacity (Figure 4.24). Stain-
less steel manifolds are available from Valencia Pipe Company or can
be assembled through the use of rigid black steel pipe and fabricated
tee manifolds. It is recommended that the station be located near the
appliance(s) with the highest load in the system to allow for shorter
runs to those appliances.
The manifold and regulator station MUST be located in an accessible
location to maintain access to the shut-o valves and regulator. The
station may be housed in a gas load center enclosure (Figure 4.23). Optional shut-o valves
can be mounted on the manifold to control each appliance run in addition to the main line
shut-o valve.
Subject to local code approval, manifolds may be concealed when used in low pressure
systems, or when the manifold is installed in a location removed from the regulator. However,
accessible locations are strongly recommended.
Figure 4.24 Example of Manifold Station Layout
Elevated pressure from gas meter
Line shut-off approved
valve
Dirt trap pocked (per
code)
Vent Limiter
House line
regulator
Union
Manifold
Low pressure to appliances
HOME-FLEX®
Fittings
4.8 Pressure Regulators
Installation Requirements
A HOME-FLEX® gas piping system used with inlet gas pressures in excess of ½ PSI, but servic-
ing appliances rated for a maximum of ½ PSI, must contain a pounds-to-inches regulator to
limit the downstream pressure to no more than ½ PSI. Gas pressure regulators must comply
with a nationally recognized standard for pressure regulators such as ANSI Z21.80/CSA 6.22.
Regulators must also conform to the following:
Figure 4.23 Gas Load Center