Air Ducts; Filter Arrangement; Ductwork Acoustical Treatment; Supply Air Connections - Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual

UNIT MAY NOT OPERATE
Failure to follow this caution may result in intemxittent unit
operation or performance satisfaction
The entire length of furnace MUST be supported when
fiu'nace is used in a horizontal position to ensure proper
draining. When suspended, bottom brace supporq_s sides and
center blower shelf When unit is supported from the ground,
blocks or pad should support sides and center blower shelf
area.
Step 4--Ak Duets
GENERAL REQUIREMENTS
The duct system should be designed and sized according to
accepted national standards such as ff*ose published by: Air
Conditioning Cormactors Association (ACCA), Sheet Metal and
Air Conditioning (ontractors National Association (SMACNA) or
American Society of Heating, Refl'igerating and Air (onditioning
Engineers (ASHRAE) or consult The .4it 5) stems Design G_ide-
lines reference tables available from your local distributor. The
duct system should be sized to handle the required system design
(FM at the design static pressure.
When a f\lrnace is installed so that tl_e supply ducts car D- air
circulated by the furnace to areas outside the space containing the
fhrnace, the return air must also be handled by a duct(s) sealed to
the furnace casing and terminating outside the space containing the
fhrnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- and return-duct connections to fhrnace with code
approved tape or duct sealer.
Flexible connections should be used between ductwmk and
fhrnace to prevent transmission 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 l-in. clearance fi'om combustible materials to supply air
ductwork fbr a distance of 36 in. horizontally fiom the furnace. See
NFPA 90B or local code fbr fhrther requirements.
For a fhmace 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.
DU( TWORK A( OUSTICAL TREATMENT
Metal duct systems that do not have a 90 degree elbow and 10 ft
of main duct to the first branch take-off may require internal
acoustical lining As an ahernafive, 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 fbr Class 1 Rigid air ducts.
SUPPLY AIR (ONNECTIONS
Epflow Furnaces
Connect supply-air duct to 3/4-in flange on fhmace supply-air
outlet. The supply-air duct attachment must ONLY be connected
to furnace supply-/outlet-air duct flanges or air conditioning coil
casing (when used) DO NOT cut main fhmace casing to attach
supply side air duct, humidifier, or other accessories. All accesso-
ries MUST be connected external to ft_rnace main casing
18
Downflow Furnaces
(onnect supply-air duct to supply-air opening on fhrnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used), when
installed on non-combustible material. When installed on combus-
tible material, supply-air duct attachment must ONLY be con-
nected to an accessow subbase or Factory approved air condition-
ing coil casing. DO NOT cut main fk/rnace casing to attach supply
side air ducL humidifier, or other accessories All accessories
MUST be connected external to fhrnace main casing. Supply air
opening duct flanges must be modified per Fig. 22.
Horizontal Furnaces
Connect supply-air duct to supply air opening on filrnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used) D() NOT
cut main furnace casing to attach supply side air duct, humidifier,
or other accessories. All accessories MUST be connected external
to fhrnace main casing.
RETURN AIR CONNECTIONS
FIRE HAZARD
Failure to %11ow this warning could result in fire, personal
injury, or death
Never connect return-air ducts to the back of the furnace
Return-air duct connections on fire, ace side(s) permitted in
upflow applications only
Upflow Furnaces
The return-air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing Bypass humidifier may be attached into unused side return
air portion of the ftmaace casing. DO NOT connect any portion of
return-air duct to back of fhmace casing.
Downflow and Horizontal Furnaces
The return-air duct must be connected to return-air opening
provided. DO NOT cut into casing sides or back to attach any
portion of return-air duct. Bypass humidifier connections should
be made at dtlctwork or coil casing sides exterior to furnace.
Step 5--FHter Arrangement
FIRE, CARBON MONOXIDE AND POISONING
HAZARD
Failure to follow this warning could result in fire, personal
injury or death.
Never operate unit without a filter or with filter access door
removed.
The air filter arrangement will vary due to application, furnace
orientation., and filter type. The filter may be installed in an
external Filter/Media cabinet (if provided) or the furnace blower
compartment Factory supplied washable filters are shipped in the
blower compartment
If a factory-supplied external Filter/Media cabinet is provided,
instructions for its application, assernbly, and installation are
packaged with the cabinet. The Filter Media cabinet can be used
with the Factory-supplied washable filter or a fhctow-specified
high-efficiency disposable filter (see cabinet instructions).