Operation & Installation Manual 09/2002

COMBUSTION - AIR

INTAKE

VENT

A 12-IN. (305 mm) MIN HORIZONTAL PIPE

SECTION IS RECOMMENDED WITH

SHORT (5 TO 8 FT / 1.5 TO 2.4 M) VENT

SYSTEMS TO REDUCE EXCESSIVE

CONDENSATE DROPLETS FROM

EXITING THE VENT PIPE.

30

″

(762 mm)MIN

WORK AREA

5

3

/

4

″

(146 mm)

MANUAL

SHUTOFF

GAS VALVE

ACCESS OPENING

FOR TRAP

SEDIMENT

TRAP

DRAIN

CONDENSATE

TRAP

NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE

FURNACE AND CONDENSATE TRAP WHEN A CONDENSING

FURNACE IS INSTALLED ABOVE FINISHED CEILINGS.

Fig. 11—Attic Location and Working Platform

c. Route extended tube (blue label) to condensate trap and cut to appropriate length.

d. Clamp tube to prevent any condensate leakage.

2. Inducer Housing Drain Tube a. Remove and discard LOWER (molded) inducer housing drain tube which was previously connected to condensate trap.

b. Use inducer housing drain extension tube (violet label and factory-supplied in loose parts bag) to connect LOWER inducer housing drain connection to the condensate trap.

c. Determine appropriate length, cut, and connect tube.

d. Clamp tube to prevent any condensate leakage.

3. Relief Port Tube a. Extend collector box tube (green label) which was previously connected to the condensate trap by splicing to small diameter tube (factory-supplied in loose parts bag).

b. Route extended collector box pressure tube to relief port connection on the condensate trap.

c. Determine appropriate length, cut, and connect tube.

d. Clamp tube to prevent any condensate leakage.

CONDENSATE TRAP FIELD DRAIN ATTACHMENTS

Refer to Condensate Drain section for recommendations and procedures.

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-

A93031 nected, extended, rerouted, and then reconnected to the pressure switch in HORIZONTAL LEFT applications for 060 and 080 heating input furnaces.

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

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 recommendations and procedures.

CONSTRUCT A WORKING PLATFORM

Construct working platform where all required furnace clearances are met. (See Fig. 3 and 11.)

11