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Installer's Guide
BASePAn TAB reMOvAl
2
2. If possible, avoid locations that are likely to accumulate
snow drifts. If not possible, a snow drift barrier should be
installed around the unit to prevent a build-up of snow on
the sides of the unit and should be of sufficient distance
from the unit to prevent restriction of airflow to and from
the unit (see note 3, next section). Also allow for proper
maintenance space. The barrier should be constructed of
materials which will blend in with the building design.
3. Avoid locating the unit where condensation and freezing
of defrost vapor may annoy the customer. For instance,
installing the unit under a bedroom, kitchen, or picture
window may be annoying to the customer since conden-
sate and fog will occur during the defrost cycle.
4. Avoid locating the unit under the eaves or other overhead
structures as sizeable icicles may form and the unit may
be damaged by these falling icicles.
General Considerations
1. When removing unit from the pallet, notice the tabs on
the basepan. Remove tabs by cutting with a sharp tool as
shown in Figure 2.
2. The unit should be set on a level support pad at least as
large as the unit base pan, such as a concrete slab. If this
is not the application used please refer to application bul-
letin SSC-APG002-EN.
3. The support pad must NOT be in direct contact with
any structure. Unit must be positioned a minimum of
12" from any wall or surrounding shrubbery to ensure
adequate airflow. Clearance must be provided in front
of control box (access panels) & any other side requiring
service access to meet National Electrical Code. Also, the
unit location must be far enough away from any structure
to prevent excess roof run-off water from pouring directly
on the unit. Do not locate unit(s) close to bedroom(s).
4. The top discharge area must be unrestricted for at least
five (5) feet above the unit.
5. When the outdoor unit is mounted on a roof, be sure the
roof will support the unit's weight. Properly selected
isolation is recommended to prevent sound or vibration
transmission to the building structure.
6. The maximum length of refrigerant lines from outdoor to
indoor unit should NOT exceed sixty (60) feet.
7. If outdoor unit is mounted above the air handler, maximum
lift should not exceed sixty (60) feet (suction line). If air
handler is mounted above condensing unit, maximum lift
should not exceed sixty (60) feet (liquid line).
NOTE:
Refer to "Refrigerant Piping Software" Pub. No. 32-3312-0*
(the position of the * denotes the latest revision number).
8. Locate and install indoor coil or air handler in accordance
with instruction included with that unit.
© 2009 Trane
C. InSTAllInG reFrIGerAnT lIneS
CAUTIOn
!
If using existing refrigerant lines make certain that all joints
are brazed, not soldered.
Condensing units have provisions for braze connections.
Pressure taps are provided on the service valves of outdoor
unit for compressor suction and liquid pressures.
The indoor end of the recommended refrigerant line sets may
be straight or with a 90 degree bend, depending upon situation
requirements. This should be thoroughly checked out before
ordering refrigerant line sets.
The gas line must always be insulated.
CAUTIOn
!
In scroll compressor applications, dome temperatures may
be hot. Touching the top of the compressor may cause minor
to severe burning.
The units are factory charged with the system charge required
when using fifteen (15) feet of rated connecting line with the
smallest rated indoor combination.
Final refrigerant charge adjustment is necessary. Use
the Subcooling Charging procedure on page 6 or in the outdoor
unit Service Facts.
1. Determine the most practical way to run the lines.
2. Consider types of bends to be made and space limitations.
NOTE:
Large diameter tubing will be very difficult to rebend once it
has been shaped.
3. Determine the best starting point for routing the refriger-
ant tubing — INSIDE OR OUTSIDE THE STRUCTURE.
4. Provide a pull-thru hole of sufficient size to allow both
liquid and gas lines.
5. Be sure the tubing is of sufficient length.
6. Uncoil the tubing — do not kink or dent.
7. Route the tubing making all required bends and properly
secure the tubing before making connections.
8. To prevent a noise within the building structure due to
vibration transmission from the refrigerant lines, the fol-
lowing precautions should be taken:
a. When the refrigerant lines have to be fastened to floor
joists or other framing in a structure, use isolation type
hangers.
b. Isolation hangers should also be used when refrigerant
lines are run in stud spaces or enclosed ceilings.
c. Where the refrigerant lines run through a wall or sill,
they should be insulated and isolated.
d. Isolate the lines from all ductwork.
d. ServICe vAlve OPerATIOn
BrASS lIqUId And GAS lIne ServICe vAlveS
The Brass Liquid and Gas Line Service Valves are factory
shipped in the seated position to hold factory charge. The
pressure tap service port (when depressed) opens only to the
field brazing side of the valve when the valve is in the seated
position. The liquid line valve is not a back seating valve (see
WARNING below).
18-BC76D1-2
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