Lennox International Inc ML193UH Installation - Setting Equipment, Shipping Bolt Removal

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

ROOF TERMINATED	VENTILATION LOUVERS
EXHAUST PIPE
	(Each end of attic)

OUTLET

AIR

SIDE WALL	FURNACE	INLET AIR
		(Ends 12” above
TERMINATED
		bottom)
EXHAUST PIPE
(ALTERNATE
LOCATION)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of the total input rating of all equipment in the enclosure.

FIGURE 8

EQUIPMENT IN CONFINED SPACE -

ALL AIR FROM OUTSIDE

leg). See figure 10. 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.

ML193UH090P48C

and ML193UH110P48C with 1/2 HP Blower Motor

RIGID LEG (Remove shipping bolt and washer)

FIGURE 10

Installation - Setting Equipment

WARNING

ROOF TERMINATED EXHAUST PIPE

SIDE WALL

TERMINATED EXHAUST PIPE (ALTERNATE LOCATION)

OUTLET AIR

FURNACE

INLET AIR

Do not connect the return air duct to the back of the furnace. Doing so will adversely affect the operation of the safety control devices, which could result in personal injury or death.

WARNING

Blower access panel must be securely in place when blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.

Upflow Applications

NOTE-Each air duct opening shall have a free area of at least one square inch per 2,000 Btu (645mm2 per .59kW) 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 communi­ cate directly with the outdoors, each opening shall have a free area of at least 1 square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of the total input rating of all other equipment in the enclosure.

FIGURE 9

Shipping Bolt Removal

Units with 1/2 hp blower motor are equipped with three flex­ ible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a flexible mounting

The ML193UH gas furnace can be installed as shipped in the upflow position. Refer to figure 12 for clearances. Se­ lect a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, conden­ sate trap and drain connections, and installation and ser­ vice clearances [24 inches (610 mm) at unit front]. The unit must be level from side to side. Unit may be positioned from level to 1/2” toward the front to aid in draining. See figure 11.

Allow for clearances to combustible materials as indicated on the unit nameplate.

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