Trane UHMB060ACV3VA Installer's Manual page 10

Installer's Guide
With a parallel flow arrangement, the dampers or other
means used to control flow of air shall be adequate to
prevent chilled air from entering the Furnace, and if
manually operated, must be equipped with means to
prevent operation of either unit unless the damper is in
full heat or cool position.
On any job, flexible connections of nonflammable mate-
rial may be used for return air and discharge connections
to prevent transmission of vibration. Though these units
have been specifically designed for quiet, vibration free
operation, air ducts can act as sounding boards and could,
if poorly installed, amplify the slightest vibration to the
annoyance level.
When the furnace is located in a utility room adjacent
to the living area, the system should be carefully de-
signed with returns to minimize noise transmission
through the return air grille. Although these furnaces
are designed with large blowers operating at moderate
speeds, any blower moving a high volume of air will
produce audible noise which could be objectionable
when the unit is located very close to a living area. It is
often advisable to route the return air ducts under the
floor or through the attic. Such design permits the in-
stallation of air return remote from the living area
(i.e. central hall).
When the furnace is installed so that the supply ducts
carry air circulated by the furnace to areas outside the
space containing the furnace, the return air shall also
be handled by a duct(s) sealed to the furnace and termi-
nating outside the space containing the furnace.
RETURN AIR DUCT SYSTEMS
▲
CAUTION
!
Safety Hazard
Sharp Edge Hazard
Be careful of sharp edges on equipment or any cuts
made on sheet metal while installing or servicing.
Personal injury may result.
Where there is no complete return duct system,
the return connection must be run full size from
the furnace to a location outside the utility room,
basement, attic, or crawl space.
Do NOT install return air through the back of the
furnace cabinet.
Do NOT install return air through the side of the
furnace cabinet on horizontal applications.
NOTE:
Minimum return air temperature is 55°F.
10
PREPARATION FOR UPFLOW BOTTOM AND SIDE
RETURN AIR FILTER INSTALLATION
All return air duct systems should provide for installa-
tion of return air filters.
1. Determine the appropriate position to set the
furnace in order to connect to existing supply and
return ductwork.
2. The return air filter is shipped in either the bottom
or side location. Remove the filter by first turning
the two latches on the blower door and tilting the
door forward to remove. Remove the filter by
sliding it out.
3. For upflow side return installations, remove the
insulation around the opening in the blower compart-
ment.
4. The side panels of the upflow furnace include
locating notches that are used as guides for cutting
an opening for return air, refer to Figure 10 and the
outline drawing on page 4 for duct connection
dimensions for various furnaces.
0
UPFLOW FURNACE ONLY
LOCATING
NOTCHES PRO-
VIDED FOR SIDE
RETURN CUTOUT
SEE OUTLINE DRAWING
*
5. If a 3/4" flange is to be used for attaching the air
inlet duct, add to cut where indicated by dotted
lines in Figure 10. Cut corners diagonally and bend
outward to form flange.
6. If flanges are not required, and a filter frame is
installed, cut between locating notches (See Figure
10).
7. The bottom panel of the upflow furnace must be
removed for bottom return air. After removing the
filter, lay the furnace on its back. Remove the two
5/16" hex screws securing the front of the bottom
channel to the cabinet.
CUT OUT FOR
SIDE FILTER
FRONT
of Furnace
18-CD30D1-9