Location; General - Carrier 58MCB Installation, Start-Up, And Operating Instructions Manual

LEVEL (0")
FRONT
TO
⁄ " MAX
1
2
UPFLOW OR DOWNFLOW
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 recommenda-
tions and procedures.
CONSTRUCT A WORKING PLATFORM
Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 11 or 12.)
FRONT
⁄ "
1
MIN
4
TO
⁄ " MAX
1
2
HORIZONTAL
A02146
FRONT
BACK
FRONT
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.
→
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. 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 39.)
→
NOTE: The 140 size unit may NOT be installed in non-direct
vent (1-pipe) application.
Step 1—General
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 11.
• 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.
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.)
14
B
A
C
K

LOCATION

A93043