Location; General; Low-Heat Only Installation; Upflow - Bryant 355MAV Installation, Start-Up, And Operating Instructions Manual
Series h deluxe 4-way multipoise variable-capacity direct vent condensing gas furnace
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Also See for 355MAV:
- Installation, start-up, and operating instructions manual (60 pages) ,
- Troubleshooting manual (48 pages) ,
- Service and maintenance procedures manual (16 pages)
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LOCATION
I. GENERAL
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This furnace must
• be installed so the electrical components are protected from
water.
• not be installed directly on any combustible material other than
wood flooring (refer to SAFETY CONSIDERATIONS).
• be located so combustion-air and vent pipe maximum lengths
are not exceeded. Refer to Table 7.
• be located where available electric power and gas supplies meet
specifications on the furnace rating plate.
• be attached to an air distribution system and be located as close
to the center of the distribution system as possible. Refer to Air
Ducts section.
• be provided with ample space for servicing and cleaning.
Always comply with minimum fire protection clearances
shown on the furnace clearance-to-combustibles label. (See
Fig. 3.)
This furnace may be located in a confined space without special
provisions for dilution or ventilation air.
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NOTE: For upflow/downflow applications install furnace so that
it is level or pitched forward within 1/2-in. for proper furnace
operation. For horizontal applications pitch 1/4-in. minimum to
1/2-in. maximum forward to ensure proper condensate drainage
from secondary heat exchangers. (See Fig. 14.)
LEVEL (0″)
FRONT
FRONT
TO
⁄
″
1
MIN
4
⁄
″ MAX
1
2
TO
⁄
″ MAX
1
2
UPFLOW OR DOWNFLOW
HORIZONTAL
A02146
Fig. 14—Proper Condensate Drainage
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When a furnace is installed so that supply ducts carry air circulated
by the furnace to areas outside the space containing the furnace,
the return air shall also be handled by ducts sealed to furnace
casing. The ducts terminate outside the space containing the
furnace to ensure there will not be a negative pressure condition
within equipment room or space.
CAUTION: Do not operate this furnace during con-
struction. If the furnace is required for temporary heating
of buildings or structures under construction, use clean
outside air free of chlorine and fluorine compounds for
combustion and ventilation. These compounds form acids
that corrode the heat exchangers. These compounds are
found in paneling and dry wall adhesives, paints, thin-
ners, masonry cleaning materials, and many other sol-
vents.
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The furnace and its return air system shall be designed and
installed so that negative pressure created by the air circulating fan
cannot affect another appliance’s combustion air supply or act to
mix products of combustion with circulating air, and that the air
circulating fan of the furnace, if installed in an enclosure commu-
nicating with another fuel-burning appliance not of the direct-vent
type, shall be operable only when any door or panel covering an
opening in the furnace fan compartment or in a return air plenum
on ducts is in the closed position.
WARNING: Do not install furnace on its back. Safety
control operation will be adversely affected. Never con-
nect return-air ducts to back of furnace. Failure to follow
this warning could result in fire, personal injury, or death.
(See Fig. 15.)
FRONT
B
A
C
K
BACK
FRONT
A93043
Fig. 15—Prohibit Installation on Back
CAUTION: If these furnaces are installed in an uncon-
ditioned space where ambient temperatures may be 32°F
or lower, freeze protection measures must be taken. (See
Fig. 16.)
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
A93058
Fig. 16—Freeze Protection
II. LOW-HEAT ONLY INSTALLATION
This 355MAV furnace can be installed to operate in the low-heat
only heating mode when sized using the low-heat heating capacity.
This is accomplished by placing setup switch SW1-2 in the ON
position to provide only low-heat operation. See Fig. 32 and Table
9. With this setup, high-heat operation will not occur.
When the model no. on the furnace rating plate is followed by an
asterisk (*), the furnace has an alternate low-heat only efficiency
rating as listed in the GAMA and CEC directories. This alternate
rating will be listed as the furnace model number followed by an
(-L) suffix.
Page 13
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