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Installer's Guide
6. If field installed electric heaters are applied, minimum air flow
settings, unit and duct clearances to combustibles must be
maintained as stated on the air handler rating nameplate.
7. If the unit is installed without a return air duct, applicable local
codes may limit this air handler to installation only in a single story
residence & within conditioned space.
8. If the outdoor unit is to be installed later, or by others, then
installation of the air handler must be made to allow access for
refrigerant lines, or attach refrigerant lines to air handler when
installing.
9. Make sure there are provisions for installing condensate drain
lines.
10. Route refrigerant & condensate drain lines away from air handler
so they do not interfere with access panels and filters.
11. When external accessories are used, the additional height and
width requirements must be considered in the overall space
needed.
12. These units are not approved for outdoor installation.
13. These units are approved for draw-through application only.
NOTE: Condensation may occur on the surface of the air
handler when installed in an unconditioned location.When units
are installed in unconditioned spaces, verify that all electrical
and refrigerant line penetrations on the air handler are sealed
completely.
B. UNIT INSTALLATION
UPFLOW
1. For maximum efficiency, the horizontal drip tray should be
removed. Tray removal requires that the coil be removed.
The tray is detached by removing the two screws at the drain
pan and the two screws holding the two brackets at the top of
the coil.
2. Openings where field wiring enters the cabinet must be
completely sealed. Location of power entry is shown on the
Outline Drawing.
3. TWG037A140, TWG042A140, TWG048A140 & TWG060A150
Only: Remove the factory installed baffle assembly from the
apex of the coil by removing the 5/16" hex head screws.
Replace this baffle with the factory supplied narrow coil baffle
using the screws removed previously (See Figure 1).
3. Position unit on Pedestal or other suitable foundation. If
Pedestal is not used, a frame strong enough to support the
total weight must be provided. Provide a minimum height of 14
inches for proper unrestricted airflow.
4. If a return air duct is connected to the air handler, it must be
the same dimensions as shown in the outline drawing.
5. Pedestal and unit should be isolated from the foundation using
a suitable isolating material.
Remove
and
Discard
Figure 1. For Maximum Efficiency on Upflow
TWG037A140, TWG042A140, TWG048A140 & TWG060A150
HORIZONTAL LEFT
1. For maximum efficiency and Customer ease of filter
maintenance, it is recommended that a properly sized remote
filter and grille be installed for horizontal applications. Airflow
© 2009 Trane
Replace
with
Narrow
Baffle
Only
should not exceed the face velocity of the filter being used.
2. The unit is shipped from the factory in the horizontal left airflow
position.
3. Openings where field wiring enters the cabinet must be
completely sealed . Location of power entry is shown on the
Outline Drawing.
4. The unit may be suspended as long as the unit is supported
from both ends as well as the middle to prevent sagging and
service access is not obstructed.
5. If the unit is not suspended it must be isolated carefully to
prevent sound transmission. Vibration isolators (field fabri-
cated) must be placed under the unit.
6. It is always recommended that an auxiliary drain pan be
installed under a horizontal air handler (See Condensate Drain
Piping) to prevent possible damage to ceilings.
7. Isolate the auxiliary drain pan from the unit or from the
structure.
8. Connect the auxiliary drain line to a separate drain line (no
trap is needed in this line) and terminate according to local
codes.
9. If a return duct is connected to the Air Handler, it must be the
same dimensions as the return opening shown in the outline
drawings.
C.DUCT CONNECTIONS
The supply and return air ducts should be connected to the unit with
flame retardant duct connectors.
Convertible duct flanges can be field fabricated to make a "flush fit" for
3/4" or 1-1/2" duct board applications, see the Outline drawing for
sizes of the duct connections. After the duct is secured, seal around
the supply duct to prevent air leakage.
D.
ACCUTRON™ FLOW CONTROL VALVE
If the indoor unit System Refrigerant Flow control is an Accutron™
orifice and check valve assembly, an orifice change may be
necessary.
The outdoor unit determines the required orifice size. Check the
orifice size stamped on nameplate of selected outdoor model. If the
indoor unit is shipped with a different orifice size, the orifice must be
changed to obtain system rated performance.
IMPORTANT: The outdoor unit will be shipped with the proper
size orifice and a stick-on orifice size label in an envelope
attached to the outdoor unit. Outdoor unit nameplate will have
correct orifice size specified as BAYFCCV---A for rated perfor-
mance.
FIELD CHANGING OF ORIFICE
NOTE: Do NOT connect refrigerant line set yet!
1. Disassemble Accutron™ assembly by turning adapter hex nut
counterclockwise. (See Figure 2).
2. Existing orifice should be removed, using a pin, wire or paper clip if
necessary.
3. Insert properly sized orifice into the Accutron™ body with
rounded "bullet" nose toward the indoor unit. (See Figure 2). Ensure
the orifice remains inserted in body when reconnecting mating
adapter removed in item 1.
4. Reconnect adapter by hand to ensure proper mating of threads
and tighten until bodies "bottom" or a definite resistance is felt.
5. Mark a line lengthwise from the union nut to the bulkhead. Then
tighten an additional 1/6 turn (or 1 hex flat). The misalignment of the
line will show the amount the assembly has been tightened. This final
1/6 turn is necessary to ensure the formation of a leakproof joint.
IMPORTANT: Correct tightening of the coupling is very impor-
tant. Under tightening or over tightening may result in a
coupling leak.
18-GJ03D1-2
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