Setting Equipment - Lennox MERIT Series 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
NOTE - 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 ship-
ping leg is flexible with rubber mounting grommets similar
to the other three mounting legs and require no modifi-
cation. The rest of the units with 1/3HP and 1/2HP blow-
er 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.
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
Installation - Setting Equipment
Do not install the furnace on its front, back or in the
horizontal position. See figure 12. Do not connect the
return air ducts 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.
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
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. Minimum clearances for closet or
alcove installations are shown in figure 13.
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.

SETTING EQUIPMENT

AIR FLOW
FRONT VIEW
Unit must be level side-to-side. Unit may be positioned
from level to 1/2" toward the front to aid in draining.
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
AIR FLOW
AIR FLOW
SIDE VIEW SIDE VIEW
FIGURE 11
1/2"
max.