Piping Package Components; Hydronic Coil Piping; Water Piping Connections - Trane UniTrane Installation, Operation And Maintenance Manual

Coil Piping and Connections

Piping Package Components

Control valves are mounted in all factory piping packages.
All piping packages are factory installed and come in a
variety of options:
• Basic: Shut-off ball valve on the supply line, control
valve and shut-off ball valve on the return line.
• Basic with manual circuit setter: Shut-off ball valve on
the supply line, control valve and manual circuit setter
on the return line.
• Deluxe with manual circuit setter: Union, strainer, P/T
port, and shut-off ball valve on the supply line. Union,
control valve, and manual circuit setter on the return
line.
• Deluxe with auto flow: Union, strainer, P/T port, and
shut-off ball valve on the supply line. Union, control
valve, auto flow valve, P/T port, and shut-off ball valve
on the return line.

Hydronic Coil Piping

Before installing field piping to the coil, consider the
following:
• All coil connections are 5/8-inch O.D. (or 1/2-inch
nominal) female copper connections.
• The supply and return piping should not interfere with
the auxiliary drain pan or condensate line. See
"Connecting the Condensate Drain" section for more
detailed information.
• The installer must provide adequate piping system
filtration and water treatment.
• Exterior condensate may be an issue (fan-coils only) if
field piping does not have a control valve. Refer to the
supply and return header locations in the "Dimensions
and Weights" section.
Note: When using a field supplied piping package in a
fan-coil unit, allow sufficient room to install the
auxiliary drain pan. In addition, piping package
must not extend over edges of auxiliary drain pan.
Connecting Field Piping to Coil
1. Remove the auxiliary drain pan, if it is in place, to
prevent exposure to dripping solder or excessive
temperatures.
2. Slide a 1/2-inch sweat connection coupling (installer
provided) onto the coil headers.
Note: For vertical fan-coil units, push the main
condensate drain hose and overflow
condensate drain hose through the inside of the
chassis end panel to prevent them from getting
burned when making sweat connections. Be
sure to pull the hoses back through and route to
the auxiliary drain pan when the end panel has
cooled.
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3. Solder the joint using bridgit lead-free solder (ASTM
B32-89) to provide a watertight connection. Avoid
overheating factory soldered joints when soldering
field connections to the coil to prevent leakage from
occurring.
4. Insulate all piping to coil connections as necessary
after connections are complete.
Note: Maintain a minimum distance of one foot
between the reduction fitting for the
diameter line and the fan-coil unit piping
connections.
5. Install the optional auxiliary drain pan, which ships in
the accessory packet.

Water Piping Connections

Before installing water piping supply and return lines to
factory piping package, note the following items.
• All piping connections are 5/8-inch O.D. (1/2-inch
nominal) female copper connections.
• The fan-coil supply and return piping should not
interfere with the auxiliary drain pan or condensate
line. See the Condensate Drain Connections section
below for more information.
• The installer must provide adequate piping system
filtration and water treatment.
• If the unit has a factory deluxe piping package, the
piping includes a strainer with a 20-mesh size screen,
which allows minimal protection from debris.
Therefore, clean the strainer regularly.
Note: Maintain a minimum distance of one foot between
the reduction fitting for the
and the fan-coil piping connections.
Connecting to Factory Piping
1. The factory installed piping package ships with
brackets to adequately support the piping during
shipment. Remove these brackets before connecting
water piping to the unit.
2. Turn the piping end valves to the fully open position to
prevent damage to the valve seat during brazing.
3. Remove the auxiliary drain pan, if it is in place, to
prevent exposure to dripping solder or excessive
temperatures.
4. Solder water piping connections to supply and return
end connections. Avoid overheating factory soldered
joints to prevent the possibility of leakage.
5. Insulate fan-coil piping to auxiliary drain pan
connections and any piping that is not above the
auxiliary drain pan.
1
/ -inch
2
1
/ -inch diameter line
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