Lennox International Inc EL296UHE NON-DIRECT Vent Application Using Existing Chimney

EL296UHE NON-DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

	SIZE TERMINATION						STRAIGHT-CUT OR
	PIPE PER TABLE 8.					ANGLE-CUT IN DIRECTION
							OF ROOF SLOPE
						EXHAUST VENT
						1/2” (13MM)
Minimum 12” (305MM)						WEATHERPROOF
						INSULATION
above chimney top
plate or average snow
				SHOULDER OF FITTINGS
accumulation
					PROVIDE SUPPORT
				OF PIPE ON TOP PLATE
			SHEET
			METAL TOP
			PLATE
		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 50

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con­ densate piping in upflow applications. In horizontal applica­ tions, the condensate trap must extend below the unit. An 8” service clearance is required for the condensate trap. Refer to figures 51 and 53 for condensate trap locations. Figure 59 shows trap assembly using 1/2” PVC or 3/4” PVC.

NOTE - If necessary the condensate trap may be installed up to 5’ away from the furnace. Use PVC pipe to connect trap to furnace condensate outlet. Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.

1 - Determine which side condensate piping will exit the unit, location of trap, field-provided fittings and length of PVC pipe required to reach available drain.

2 - Use a large flat head screw driver or a 1/2” drive socket extension and remove plug (figure 51) from the cold end header box at the appropriate location on the side of the unit. Install provided 3/4 NPT street elbow fitting into cold end header box. Use Teflon tape or appropri­ ate pipe dope.

3 - Install the cap over the clean out opening at the base of the trap. Secure with clamp. See figure 59.

4 - Install drain trap using appropriate PVC fittings, glue all joints. Glue the provided drain trap as shown in fig­ ure 59. Route the condensate line to an open drain. Condensate line must maintain a 1/4” downward slope from the furnace to the drain.

CONDENSATE TRAP AND PLUG LOCATIONS

(Unit shown in upflow position)

Trap

(same on right side)

1-1/2 in.

Plug (same on left side)

NOTE - In upflow applications where side return air filter is installed on same side as the conden­ sate trap, filter rack must be installed beyond condensate trap or trap must be re-located to avoid interference.

FIGURE 51

5 - Figures 54 and 56 show the furnace and evaporator coil using a separate drain. If necessary the conden­ sate line from the furnace and evaporator coil can drain together. See figures 55, 57 and 58.

Upflow furnace (figure 57) - In upflow furnace applica­ tions the field provided vent must be a minimum 1” to a maximum 2” length above the condensate drain outlet connection. Any length above 2” may result in a flooded heat exchanger if the combined primary drain line were to become restricted.

Horizontal furnace (figure 58) - In horizontal furnace applications the field provided vent must be a mini­ mum 4” to a maximum 5” length above the condensate drain outlet connection. Any length above 5” may re­ sult in a flooded heat exchanger if the combined pri­ mary drain line were to become restricted.

NOTE - In horizontal applications it is recommended to install a secondary drain pan underneath the unit and trap assembly.

NOTE - Appropriately sized tubing and barbed fitting may be used for condensate drain. Attach to the drain on the trap using a hose clamp. See figure 52.

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