Lennox International Inc G61MP NON−DIRECT Vent Application Using Existing Chimney

3.If exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, pip- ing must be supported every 3 feet (.9m) as shown in figure 12. Refer to figure 31 for proper piping method. When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.

CONDENSATE TRAP LOCATIONS

(Unit shown in upflow position)

Horizontal	Horizontal
left and	right and
optional	optional
downflow	downflow

Inches(mm)

UNCONDITIONED

SPACE

OUTSIDE WALL

PROVIDE SUPPORT

FOR EXHAUST LINES

EVERY 36" (914)

FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE TO

TERMINATION

1/2" (13) FOAM INSULATION IN UNCONDITIONED SPACE

12" (305) Max. for 2" (51) Unless Supported

SIZE TER-

MINATION

PIPE PER

TABLE 14.

12" (305) ABOVE AVERAGE SNOW ACCUMULATION

1/2" (13) FOAM INSULATION

Optional	Optional
upflow	upflow

FIGURE 33

1 − Determine which side condensate piping will exit the unit. Remove plugs from the condensate collar at the

SIDE VIEW

NON−DIRECT VENT WALL RING TERMINATION

(15F74)

FIGURE 31

G61MP NON−DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

SIZE TERMINATION							STRAIGHT−CUT OR
PIPE PER TABLE 14.						ANGLE−CUT IN DIRECTION
							OF ROOF SLOPE
			3" − 8"
						EXHAUST VENT
			(76mm−			1/2" (13mm)
			203mm)
						WEATHERPROOF
MINIMUM12"						INSULATION
(305mm)12" (304mm)ABOVE
ABOVE AVERAGE
AVERAGE SNOW
SNOW ACCUMULATION
ACCUMULATION				SHOULDER OF FITTINGS
					PROVIDE SUPPORT
				OF PIPE ON TOP PLATE
		SHEET
		METAL TOP
		PLATE
					3" − 8"
					(76mm−
					203mm)
	INSULATE
	TO FORM						EXTERIOR
	SEAL						PORTION OF
							CHIMNEY

NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If ver- tical discharge through an existing unused chimney or stack is required, insert piping inside chimney until the pipe open end is above top of chimney and terminate as illus- trated. In any exterior portion of chimney, the exhaust vent must be insulated.

FIGURE 32

Condensate Piping

This unit is designed for either right- or left-side exit of con- densate piping in either upflow or downflow applications; however, it must be installed on the same side of the unit as the exhaust piping. In horizontal applications, the conden- sate trap should extend below the unit. A 5−1/2" service clearance is required for the condensate trap. Refer to fig- ure for condensate trap locations.

appropriate location on the side of the unit.

NOTE − The condensate trap is factory−shipped with two rubber O−rings and two rubber clean−out caps installed. Check to make sure that these items are in place before installing the trap assembly.

2 − Install condensate trap onto the condensate collar. Use provided HI/LO screws to secure two upper flanges of the trap to the collar. Use provided sheet metal screw to secure bottom trap flange to side of unit. See figure 34.

NOTE − In upflow and downflow applications, con- densate trap must be installed on the same side as exhaust piping.

CAUTION

DO NOT use a power driver to tighten screws which secure condensate trap to cabinet. Screws should be hand−tightened using a screw driver to avoid the possibility of damage to the trap assembly.

3 − Glue the field−provided coupling or pipe to the trap. Install a tee and vent pipe near the trap.

NOTE − The condensate trap drain stubs (both sides) have an outer diameter which will accept a standard 3/4" PVC coupling. The inner diameter of each stub will accept standard 1/2" diameter PVC pipe.

NOTE − Vinyl tubing may be used for condensate drain. Tubing must be 1−1/4" OD X 1" ID and should be attached to the drain stubs on the trap using a hose clamp.

4 − Glue the field−provided drain line to the tee. Route the drain line to an open drain. As an alternate, clear vinyl tubing may be used to drain condensate away from the trap. Secure the vinyl tubing to the drain stubs on the trap using a hose clamp. Do not overtighten the

Page 28