Installation and Maintenance Manual

36 UNT-SVX07D-EN
Installation—Mechanical
Duct Connections
Install all air ducts according to National Fire Protection
Association standards for the Installation of Air
Conditioning and Ventilating Systems (NFPA 90A and
90B).
Install all air ducts according to the National Fire Protection
Association standards for the “Installation of Air
Conditioning and Ventilation Systems other than
Residence Type (NFPA 90A) and Residence Type Warm Air
Heating and Air Conditioning Systems (NFPA 90B).
The unit’s airflow configuration varies dependent on the
model and options ordered. A one-inch duct collar is
provided on units with a ducted return and/or discharge to
attach ductwork to the unit.
Trane recommends using galvanized sheet metal
ductwork with fan-coil and cabinet heater units. Slide the
sheetmetal duct over the duct collar flange of the unit, seal
the joint and fasten with sheetmetal screws.
Note: Do not run screws through the removable front
panel on concealed units.
Ductwork Recommendations
Follow the general recommendations listed below when
installing ductwork for the unit.
1. Discharge ductwork should run in a straight line,
unchanged in size or direction, for a minimum
equivalent distance of three fan diameters from the
unit (approximately 20 inches).
2. When making duct turns and transitions avoid sharp
turns and use proportional splits, turning vanes, and
air scoops when necessary.
3. When possible, construct, an
d orient supply ductwork
turns in the same direction as the fan rotation.
Piping Considerations
Hydronic Coil Piping
Before installing field piping to the coil, consider the
following:
• All coil connections are 5/8-inc
h O.D. (or 1/2-inch
nominal) female copper connections.
• The supply and return piping should not interfere with
the aux
iliary 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 is
sue (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: Wh
en 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
pro
vided) onto the coil headers.
Note: F
or 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.
3. Solder the joint using bridgit le
ad-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: Ma
intain a minimum distance of one foot
between the reduction fitting for the
1
/
2
-inch
diameter line and the fan-coil unit piping
connections.
5. Install the optional auxiliary drain pan, which ships in
the accessory pac
ket.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer’s
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect
power and discharge capacitors before servicing could
result in death or serious injury.
For additional information regarding the safe discharge of
capacitors, see PROD-SVB06A-EN
UNT-SVX07_-EN.book Page 36 Friday, April 27, 2012 9:40 AM