e. Determine appropriate length, cut, and connect tube to condensate trap.
f. Clamp tube to prevent any condensate leakage.
3. Relief Port Tube
Refer to Pressure Switch Tubing section for connection procedure.
C.
Condensate Trap Field Drain Attachment
Refer to Condensate Drain section for recommendations and procedures.
D.
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.
E.
Condensate Trap Freeze Protection
Refer to Condensate Drain Protection section for recommendations and procedures.
F.
Construct a Working Platform
Construct working platform where all required furnace clearances are met. (See Fig. 2 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 minimum length of 5 ft. (See Table 9 or 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, 38, or 54.)
NOTE:
The 140 Size unit may not be installed in non-direct vent applications.
LOCATION
PROCEDURE 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 9 or 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.)
When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return
air shall also be handled by duct(s) sealed to furnace casing and terminating outside the space containing the furnace to ensure there will not be
a negative pressure condition within equipment room or space.
WARNING: FIRE, INJURY OR DEATH HAZARD
Failure to follow this warning could result in fire, property damage, personal injury, or death.
Do not install furnace on its back. Safety control operation will be adversely affected. Never connect return-air ducts to back of furnace.
(See Fig. 15.)
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