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Within mechanical rooms, manifold stations are often
mounted on the surface of the walls and are fully accessible
to service personnel. The preferred orientation of a manifold
station is usually horizontal with tubing routed downward,
and the return manifold at the top, as shown in figure 6-23.
This arrangement allows any air bubbles within the circuits
to migrate with the flow and eventually reach the return
manifold with its attached air vent.
Other orientations are possible. One is mounting the
manifold station to the underside of a floor, as shown in
figure 6-24. This location is sometimes chosen to eliminate
the need for manifold enclosures above the floor. In some
cases, it allows all system piping (other than continuous
lengths of tubing in floor panels) to remain within a
basement or crawlspace. When small diameter PEX or
PEX-AL-PEX tubing is used for the branch circuits, they
can usually be bent by hand such that they can penetrate
the floor at a shallow angle and become part of a radiant
floor panel assembly.
Figure 6-24
Manifolds can also be inverted, provided the system is
properly purged and equipped with a high-performance
air separator. However, manifolds with valve actuators
should never be mounted with the actuators upside
down. This is a precaution against the possibility of fluid
leaking from a manifold connection and subsequently
dripping onto the electrically operated actuator, causing
damage.