-- 16 --
UPFLOW OR DOWNFLOW
HORIZONTAL
FRONT
FRONT
LEVEL (0”)
TO 1/2” (13mm)
MAX
MIN 1/4” (7mm)
TO 1/2” (13mm)
MAX
A02146
Fig. 14 -- Furnace Location for Proper Condensate Drainage
PRESSURE SWITCH TUBING
One collector box pressure tube (pink label) is factory connected
to the pressure switch for use when furnace is installed in
UPFLOW applications. This tube MUST be disconnected and
used for the condensate trap relief port tube. The other collector
box pressure tube (green label) which was factory connected to
the condensate trap relief port connection MUST be connected to
the pressure switch in DOWNFLOW or HORIZONTAL
RIGHT applications.
NOTE
: See Fig. 13 or tube routing label on main furnace door to
check for proper connections.
Relocate tubes as described below:
1. Disconnect collector box pressure tube (pink label)
attached to pressure switch.
2. Extend collector box pressure tube (green label) which
was previously connected to condensate trap relief port
connection
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
pressure 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.
CONDENSATE TRAP FREEZE PROTECTION
Refer
to
Condensate
Drain
Protection
section
for
recommendations and procedures.
CONSTRUCT A WORKING PLATFORM
Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 11 or 12.)
FRONT
BACK
FRONT
B
A
C
K
A93043
Fig. 15 -- Installation on Back is Prohibited
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent
unit operation.
The condensate trap MUST be installed below furnace. See
Fig. 5 for dimensions. The drain connection to condensate
trap must also be properly sloped to an open drain.
CAUTION
!
NOTE
: Vent pipe(s) and combustion-air pipe (when applicable)
are restricted to a minimum length of 5 ft. (See Table 11.)
NOTE
: A 12-in. (305 mm) minimum offset pipe section is
recommended with short (5 to 8 ft) vent systems. This
recommendation is to reduce excessive condensate droplets from
existing vent pipe. (See Fig. 11, 12 or 41.)
NOTE
: The 140 size unit may NOT be installed in non-direct
vent (1-pipe) application.
LOCATION
Step 1 -- General
This furnace must
S
be installed so the electrical components are protected
from water.
S
not be installed directly on any combustible material other than
wood flooring (refer to SAFETY CONSIDERATIONS).
S
be located so combustion-air and vent pipe maximum lengths
are not exceeded. Refer to Table 11.
S
be located where available electric power and gas supplies
meet specifications on the furnace rating plate.
S
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.
S
be provided with ample space for servicing and cleaning.
Always comply with minimum fire protection clearances
shown on the furnace clearance to combustibles label.
NOTE
: For upflow/downflow applications install furnace so that
it is level or pitched forward within 1/2-in. (13 mm) for proper
furnace operation. For horizontal applications pitch 1/4-in. (6
mm) minimum to 1/2-in. (13 mm)maximum forward to ensure
proper condensate drainage from secondary heat exchangers.
(See Fig. 14.)
58MCB