Carrier 140/E Series Installation, Start--Up, Operating, And Service And Maintenance page 15

LINE CONTACT ONLY P ERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES O F THE FURNACE
JACKET AND BUILDING JOISTS,
STUDS, OR FRAMING.
17
3/4"
(451 mm)OVERALL
4
3/4"
(121mm) UNDER DOOR
1" (25mm) UNDER FURNACE
ENTRY
VENT
EXTEND OUT 12" (305mm)
FROM FACE OF DOOR
_0-1N. (762mm)
MIN WORK AREA *WHEN USED WITH
SINGLE WALL VENT
CONNECTIONS
EQUIPMENT MANUAL
SHUT-OFF GAS VALVE
SEDIMENT
TRAP
UNION
A10164
Fig. 17 - Typical Attic Installation
Not all horizontal furnaces are approved for side return air
connections. (See Fig. 20.)
FILTER ARRANGEMENT
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
iniury, or death.
Never operate a furnace without a filter or with filter access
door removed.
There are no provisions for an internal filter rack in these
furnaces. A field-supplied, accessory external filter rack is
required.
Refer to the instructions supplied with the external filter rack for
assembly and installation options.
AIR DUCTS
General Requirements
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
or American Society of Heating, Refrigerating and Air
Conditioning Engineers (ASHRAE) or consult The Air Systems
Design Guidelines reference tables available from your local
distributor. The duct system should be sized to handle the
required system design CFM at the design external static pressure.
The furnace airflow rates are provided in Table 5-Air Delivery
CFM (With Filter).
When a 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 duct(s) sealed to
the furnace casing and ternfinating outside the space containing
the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- and return-duct connections to furnace with code
approved tape or duct sealer.
NOTE: Flexible connections should be used between ductwork
and furnace to prevent transnfission of vibration.
Ductwork passing through unconditioned space should be
insulated to enhance system performance. When air conditioning
is used, a vapor barrier is recommended.
Maintain a 1-in. (25 ram) clearance from combustible materials
to supply air ductwork for a distance of 36 in. (914 ram)
horizontally from the furnace. See NFPA 90B or local code for
further requirements.
Ductwork Acoustical Treatment
NOTE: Metal duct systems that do not have a 90 ° elbow and 10
ft. (3 M) of main duct to the first branch take-off may require
internal acoustical lining. As an alternative, fibrous ductwork may
be used if constructed and installed in accordance with the latest
edition of SMACNA construction standard on fibrous glass
ducts. Both acoustical lining and fibrous ductwork shall comply
with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid
air ducts.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent leaks.
Upflow and Horizontal Furnaces
Connect supply-air duct to flanges on furnace supply-air outlet.
Bend flange upward to 90 ° with wide duct pliers. (See Fig. 14.)
The supply-air duct must be connected to ONLY the furnace
supply-outlet-air duct flanges or air conditioning coil casing
(when used). DO NOT cut main furnace casing side to attach
supply air duct, hunfidifier, or other accessories. All accessories
MUST be connected to duct external to furnace main casing.
NOTE: For horizontal applications, the top-most flange may be
bent past 90 ° to allow the evaporator coil to hang on the flange
temporarily while the remaining attachment and sealing of the
coil are performed.
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