Shipping Bolt Removal; Installation - Setting Equipment - Lennox ML193UH Installation Instructions Manual

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE
(All Air Through Ventilated Attic)
ROOF TERMINATED
EXHAUST PIPE
OUTLET
AIR
SIDE WALL
FURNACE
TERMINATED
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 (645mm
of the total input rating of all equipment in the enclosure.
FIGURE 8
EQUIPMENT IN CONFINED SPACE -
ALL AIR FROM OUTSIDE
ROOF TERMINATED
EXHAUST PIPE
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
NOTE-Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645mm
input rating of all equipment in the enclosure. If the equipment room
cate directly with the outdoors, each opening shall have a free area
of at least 1 square inch per 4,000 Btu (645mm
hour of the total input rating of all other equipment in the enclosure.
FIGURE 9

Shipping Bolt Removal

Units with 1/3HP and 1/2HP blower motors are equipped
with three flexible legs and one shipping leg. See figure
10. In some units with 1/3HP blower motor, the shipping
leg is flexible with rubber mounting grommets similar to
the other three mounting legs and require no modification.
VENTILATION LOUVERS
(Each end of attic)
INLET AIR
(Ends 12" above
bottom)
2
per 1.17kW) per hour
OUTLET AIR
FURNACE
INLET AIR
2
per .59kW) per hour of the total
2
per 1.17kW) per
The rest of the units with 1/3HP and 1/2HP blower motors
(these blower motor housings will be tagged) have a rigid
shipping leg equipped with a shipping bolt and flat white
plastic washer. The bolt and washer must be removed
before the furnace is placed into operation. After the
bolt and washer have been removed, the rigid leg will not
touch the blower housing.

Installation - Setting Equipment

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.
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
The ML193UH gas furnace can be installed as shipped
in the upflow position. Refer FIGURE 12 for clearances.
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,
condensate trap and drain connections, and installation
and service clearances [24 inches (610 mm) at unit front].
The unit must be level from side to side. Unit may be posi-
tioned from level to 1/2" toward the front to aid in draining.
See FIGURE 11.
Allow for clearances to combustible materials as indicated
in the unit nameplate.
Page 8
Blower motor with three exible legs and one
rigid shipping leg. Blower motor housings
will be tagged for shipping bolt removal
RIGID LEG
(Remove shipping bolt
and washer)
FIGURE 10
WARNING
WARNING