PRESSURE SWITCH TUBING
The LOWER collector box pressure tube (pink label) is factory
connected to the High Pressure Switch for use when furnace is
installed in UPFLOW applications. This tube MUST be discon-
nected, extended, rerouted, and then reconnected to the pressure
switch in HORIZONTAL LEFT applications for 060 and 080
heating input furnaces.
NOTE: See Fig. 11 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
High 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.
4. Determine appropriate length, cut, and reconnect tube to High
Pressure Switch connection labeled COLLECTOR BOX.
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 12.)
The condensate trap MUST be installed below furnace. See
Fig. 6 for dimensions. The drain connection to condensate
trap must also be properly sloped to an open drain. Failure to
follow this caution will result in intermittent unit operation.
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. 12 or 35.)
Step 5—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.
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. Failure to follow this
caution will result in minor property damage.
NOTE: In Canada, installations shall be in accordance with
current NSCNGPIC Installation Codes and/or local codes.
NOTE: The auxiliary junction box (J-box) MUST be relocated to
opposite side of furnace casing. (See Fig. 13.) See Electrical
Connection section for J-box relocation.
Fig. 12—Attic Location and Working Platform
A93031
COMBUSTION – AIR
INTAKE
VENT
MANUAL
SHUTOFF
GAS VALVE
SEDIMENT
TRAP
CONDENSATE
TRAP
DRAIN
ACCESS OPENING
FOR TRAP
30″ MIN
WORK AREA
A 12-IN. MIN HORIZONTAL PIPE
SECTION IS RECOMMENDED WITH
SHORT (5 TO 8 FT) VENT SYSTEMS
TO REDUCE EXCESSIVE
CONDENSATE DROPLETS FROM
EXITING THE VENT PIPE.
5
3
⁄
4
″
NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE
FURNACE AND CONDENSATE TRAP WHEN A CONDENSING
FURNACE IS INSTALLED ABOVE FINISHED CEILINGS.
11
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