Trane ADH1B040A9241A, Руководство по установке

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18-CD29D1-11 9
Installer’s Guide
DUCT CONNECTIONS
Air duct systems should be installed in accordance with
standards for air conditioning systems, National Fire Pro-
tection Association Pamphlet No. 90. They should be sized
in accordance with ACCA Manual D or whichever is appli-
cable.
Central furnaces, when used in connection with cooling
units, shall be installed in parallel or on the upstream side
of the cooling coil to avoid condensation in the heat ex-
changer. 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 manu-
ally operated, must be equipped with means to prevent op-
eration of either unit unless the damper is in full heat or
cool position.
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On any job, flexible connections of nonflammable materi-
al may be used for return air and discharge connections to
pre vent 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 in-
stalled, amplify the slightest vibration to the annoyance lev-
el.
When the furnace is located in a utility room adjacent to
the living area, the system should be carefully designed
with returns to minimize noise transmission through the
return air grille. Although these furnaces are designed
with large blowers operating at moderate speeds, any blow-
er 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 re-
turn air ducts under the floor or through the attic. Such de-
sign permits the installation 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 con-
taining the furnace, the return air shall also be handled by
a duct(s) sealed to the furnace and terminating outside the
space containing the furnace.
RETURN AIR DUCT CONNECTION
NOTE:
On upflow 5 or 6 ton airflow models where the airflow re-
quirement exceeds 1800 CFM - Models will require return
air openings and filters on: (1) both sides; or (2) one side
and the bottom; or (3) just the bottom.
All return air duct systems should provide for installation
of return air filters.
1. Determine the appropriate position to set the furnace
in order to connect to the existing supply and return
ductwork.
2. For side return installations on upflow models, remove
the insulation around the opening in the blower com-
partment.
NOTE:
Minimum return air temperature is 55° F.
3. The side panels on upflow furnaces include locating
notches which may be used as guides for cutting an
opening for return air. Refer to Figure 11 and the out-
line drawing on pages 5-6 for duct connection dimen-
sions for various furnaces.
4. If a 3/4" flange is to be used for attaching the air inlet
duct, add to cut where indicated by dashed lines in
Figure 11. Cut corners diagonally and bend outward to
form flange.
5. If flanges are not required, and a filter frame is in-
stalled, cut along knockout guidelines.
6. Upflow Furnaces: Use the optional filter rack on
either side or on the bottom if the filter is to be used
within the furnace cabinet.
When the upflow furnace is installed in the horizontal
application and a return duct is attached to the top side
as shown in Figure 10, install the filter in a remote
location.
Do not install the filter in the return duct directly
above the furnace in horizontal applications.