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General Data
UNT-PRC001-EN
14
Factory-Installed Piping
Packages
UniTrane
®
fan-coils have standard piping
packages available as a factory built and
installed option, for the main coil. Piping
package options are also available for the
hot water reheat coil on two-pipe units
equipped with either a fan speed switch
or Tracer
®
ZN.520 controller. Factory built
assures all piping packages are fully
tested under water for leaks and are built
within strict tolerances. Factory-installed
means that chilled and hot water pipes
are the only field connections required.
The installer doesn’t have to sweat
connect piping packages onto coil
connections in a tight end pocket. Field
connections are brought to a point near
the exterior of the unit for easy access.
All piping and components are located to
allow condensate to drain into the
auxiliary drain pan. Insulation of the
factory piping package is not required.
However, all field connections should be
insulated to prevent condensation from
missing the auxiliary drain pan.
Piping Package Components
UniTrane piping packages consist of a
variety of components for each applica-
tion. The following section provides a
detailed description of each of the piping
components. Following this section are
additional illustrations and specifications.
Piping System/Placement
Factory piping systems are available for
either two or four-pipe systems with right
or left hand connections. Four-pipe
systems have both the heating and
cooling connections on the same side of
the unit. A simple coil connection (a unit
without a piping package) is also avail-
able in either a right or left hand configu-
ration for those applications requiring
field piping.
Interconnecting Piping
Interconnecting piping refers to the
copper piping which is attached to the coil
connections and to which all other
components (control valves, end valves,
etc.) are attached. Piping is
1
/
2
” nominal
OD copper. Two-pipe piping extends near
the unit exterior to one inlet and one
outlet connection.Four-pipe units have
two sets of piping that extend near the
unit’s exterior—one inlet and one outlet
each for both chilled and hot water. A label
identifying connection points clearly
marks both chilled and hot water on
every unit.
Deluxe or Basic Piping Package
The basic piping package includes only
the main components of the piping
package: interconnecting piping, control
valves, and end valves.
The deluxe piping package also includes
a strainer on the entering water pipe and
unions at the coil connections along with
the basic components. The strainer body
is cast brass construction, with a stain-
less steel mesh strainer that is easily
removed for cleaning. The unions are
forged brass construction and close with
a minimum amount of effort.
End Valves
Each piping package includes a ball valve
for the entering water pipe and one of the
following end valves on the leaving water
pipe: ball valve, manual circuit setter, or
an auto circuit setter. These valves serve
as the field connection points on all
UniTrane piping packages.
• Ball Valves
Ball valves, also known as stop or end
valves, allow the unit to be cut off for
service purposes. These valves have a
two-inch handle that rotates 90 degrees
to a fully open position. The valve body is
cast brass, and the ball is polished brass
with a Teflon seat. Ball valves are
available as end valves on both the
entering and leaving water pipes.
Factory-installed and tested piping package. Two-pipe deluxe package with manual circuit
setter is shown on a horizontal concealed unit.
Piping Packages