D.
Pressure Switch Tubing
The LOWER 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,
extended, rerouted, and then reconnected to the pressure switch in
HORIZONTAL LEFT applications.
NOTE:
See Fig. 10 or tube routing label on main furnace door to
check for proper connections.
Modify tube as described below.
1. Disconnect collector box pressure tube (pink label) attached
to pressure switch.
2. Use smaller diameter tube (factory-supplied in loose parts
bag) to extend tube disconnected in item 1.
3. Route extended tube:
a. Behind inducer housing.
b. Between blower shelf and inducer housing.
c. Behind inducer motor bracket.
d. Between inducer motor and pressure switch.
4. Determine appropriate length, cut, and reconnect tube to
pressure switch connection labeled COLLECTOR BOX.
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 11 or 12.)
CAUTION:
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:
Combustion-air and vent pipes are restricted to a mini-
mum 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 exiting the vent pipe.
(See Fig. 11, 12 or 38.)
V.
HORIZONTAL RIGHT (SUPPLY-AIR DISCHARGE)
APPLICATIONS
A horizontal right furnace application is where furnace blower is
located to the left of combustion and controls section of furnace,
and conditioned air is discharged to the right.
CAUTION:
PROPERTY DAMAGE
Failure to follow this caution may result in minor
property damage.
Local codes may require a drain pan under entire furnace
and condensate trap when a condensing furnace is used in
attic application or over a finished ceiling.
NOTE:
In Canada, installations shall be in accordance with
current NSCNGPIC Installation Codes and/or local codes.
Fig. 10—Horizontal Left Tube Configuration
A00215
CONDENSATE
TRAP
AUXILIARY
"
J
"
BOX
PLUG
CAP
INDUCER HOUSING
DRAIN TUBE (VIOLET)
COLLECTOR BOX
DRAIN TUBE (BLUE)
COLLECTOR BOX TUBE (PINK)
RELOCATE TUBE BETWEEN BLOWER SHELF AND INDUCER HOUSING FOR
040, 060, AND 080 HEATING INPUT FURNACES
COLLECTOR BOX
EXTENSION TUBE
COLLECTOR BOX
DRAIN TUBE
(BLUE AND WHITE STRIPED)
DRAIN TUBE COUPLING
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR
BOX EXTENSION
DRAIN TUBE
—11—
