Lennox International Inc G50UH-60D-155, G50UH-48C-110, G50UH-60D-135 I I Y, Allairfrom

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

CHIMNEY(All Air Through Ventilated Attic)

OR GAS

VENT_

VENTILATION LOUVERS (Each end of attic)

FURNACE

INLET AIR (Ends 12 in. above bottom)

HEATER

NO TE- The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm 2) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equip- ment in the enclosure.

FIGURE 4

A	_	EQUIPMENT IN
TT'_.	JJ_	CONFINED SPACE
I I "_'Y _		ALLAIRFROM
I 1		OUTLET AIR
		,,
FURNACE
I1"-

I ii I I I I I I I I I I I

NOTE - Each air duct opening shall have a free area of at least

one square inch (645 mm 2J per 2, 000 Btu (.59 kW) per hour of the total input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communicate directly with the outdoors, each open- ing shall have a free area of at least one square inch (645 mm 2) per4,000 Btu (1.17 kW) per hour of the total input rating of all other equipment in the enclosure.

FIGURE 5

-&WARNING

The G50UH(X) gas furnace can be installed as shipped in either the upfiow position or the horizontal position, with right-hand or left-hand air discharge.

Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, and installation and service clearances [24 inches (610

mm)at unit front]. The unit must be level.

NOTE - 1/3 hp blower motors are equipped with four flex- ible mounting legs. 1/2 hp blower motors are equipped with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic wash- er (rather than the rubber mounting grommet used with a flexible mounting leg). The bolt and washer must be re- moved before the furnace is placed into operation. Af- ter the bolt and washer have been removed, the rigid leg will not touch the blower housing.

Upflow Applications

Allow for clearances to combustible materials as indicated

on the unit nameplate. Minimum clearances for closet or al- cove installations are shown in figure 6.

Upflow Application Installation Clearances

Top

Left Side Right Side

Bottom

Type of Vent	Type C	Type		B1
Connector
Top	1 in, (25 ram)	1 in,	(25	ram)
*Front	3 in, (76 ram)	3 in,	(76	ram)
Back	0		0
Sides	Ot		0
Vent	6 in. (152 ram)	1 in.	(25	ram)
Floor	05		0J;

*Front clearance in alcove installation must be 24 in. (610 ram). Maintain a minimum of 24 in. (610 ram) for front service access. SFor installation on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

l-Leftside requires 3 inches ifa single wall vent is used on 14-1/2

inch cabinets, or 2 inches if a single wall vent is used on 17-1/2 inch cabinets.

FIGURE 6

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