Condensate Trap Freeze Protection; Construct A Working Platform; Location; General - Bryant 350MAV Installation, Start-Up, And Operating Instructions Manual

2. Extend collector box pressure tube (green label) which was
previously connected to condensate trap relief port connec-
tion by splicing to small diameter tube (factory-supplied in
loose parts bag).
3. Route extended collector box pressure tube behind inducer
motor bracket then between inducer motor and pressure
switch.
4. Connect collector box pressure tube (green label) to pres-
sure switch connection labeled COLLECTOR BOX.
5. Use remaining smaller diameter tube (factory-supplied in
loose parts bag) to extend collector box pressure tube (pink
label) which was previously connected to pressure switch.
6. Route this extended tube (pink label) to condensate trap
relief port connection.
7. Determine appropriate length, cut, and connect tube.
8. Clamp tube to relief port connection.
E. Condensate Trap Freeze Protection
Refer to Condensate Drain Protection section for recommenda-
tions and procedures.
F. Construct a Working Platform
Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 10.)
CAUTION: The condensate trap MUST be installed
below furnace. See Fig. 4 for dimensions. The drain
connection to condensate trap must also be properly
sloped to an open drain.
NOTE: Combustion-air and vent pipes are restricted to a mini-
mum length of 5 ft. (See Table 7.)
NOTE: A 12-in. minimum offset pipe section is recommended
with short (5 to 8 ft) vent systems. This recommendation is to
reduce excessive condensate droplets from exiting the vent pipe.
(See Fig. 10 or 34.)

LOCATION

I. GENERAL
When a furnace is installed so that supply ducts carry air to areas
outside the space containing the furnace, return air must 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.
Furnace may be located in a confined space without special
provisions for dilution or ventilation air. This furnace must be
installed so electrical components are protected from water.
Locate furnace as close to center of air distribution system as
possible.
NOTE: For proper furnace operation, install furnace so that it is
level or pitched forward within 1/2 in. to ensure proper condensate
drainage from secondary heat exchangers. (See Fig. 12.)
NOTE: These furnaces are designed for a minimum continuous
return-air temperature of 60°F or intermittent operation down to
55°F such as when used with a night setback thermostat. Return-air
temperature must not exceed a maximum of 85°F. Failure to
follow these return-air temperature limits may affect reliability of
heat exchangers, motors, and controls. (See Fig. 13.)
Locate furnace so combustion-air pipe maximum lengths are not
exceeded. Refer to Table 7.
LEVEL (0")
FRONT
TO
" MAX
1
⁄
2
UPFLOW OR DOWNFLOW
Fig. 12—Furnace Location for Proper Condensate
Fig. 13—Return-Air Temperature
FRONT
BACK
Fig. 14—Prohibit Installation on Back
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. 14.)
—12—
FRONT
LEVEL (0")
TO
" MAX
1 ⁄
2
HORIZONTAL
Drainage
FRONT
A93025
A93042
B
A
C
K
A93043