Combustion Air - Lennox Hearth Products Merit CPF-38 Homeowner's Care And Operation Instructions Manual

CAUTION: GLASS AND METAL FRAMES GET
HOT — ALWAYS USE HANDLES TO OPEN AND
CLOSE THE DOORS.
WARNING: CERTAIN MODEL FIRE-
PLACES REQUIRE THAT THE GLASS
DOORS BE CLOSED DURING OPERA-
TION. BE AWARE THAT SAFETY GLASS
IS UNPREDICTABLE WHEN HOT AND
MAY BREAK, EXPELLING HOT GLASS
INTO THE ROOM. ADVISE ALL FAMILY
MEMBERS TO REMAIN WELL AWAY
FROM THE FIREPLACE WHEN OPERAT-
ING WITH DOORS CLOSED TO AVOID
ANY POSSIBLE PERSONAL INJURY.

COMBUSTION AIR

A proper amount of combustion air is impor-
tant for your fireplace. Fireplaces consume
large amounts of oxygen. It is important to
allow an adequate supply of air. If the fireplace
is not equipped with an outside air kit, it may
not obtain sufficient amounts of combustion
air from inside the house or structure in which
it is installed. Therefore, the fire may draw
from an outside air source and pull air in
through the chimney. This may cause smoke
spillage into the room.
Smoke spillage often occurs when a fire is first
started, until the fireplace and the chimney has
had the opportunity to "come up to tempera-
ture" and to begin to function normally. If
smoke spillage problems persist, a window
may be opened just a crack to allow the proper
flow of combustion air to the fireplace.
If your fireplace is equipped with an outside
combustion air kit, keep open at all times when
fire is burning and close when fire is out to
prevent cold air intrusion.
Combustion Air Control
The operation and location of the outside air
control lever varies to some extent on different
fireplace models.
On the CR Series fireplaces, the control lever
that operates the outside combustion air valve
has been pre-installed on your fireplace. A
coverplate has been mounted over this control
lever only if the outside air kit has not been
attached. The control lever is located on the
closed end of the fireplace opening behind the
screen. To open the air damper, turn the lever
handle 1/2 turn counter clockwise (or until
lever can be moved upward), then re-tighten at
desired open position. To close damper, re-
verse procedure ( Figure 5 ).
Control
Lever
Figure 5
On the Merit Series fireplaces, the control
lever that operates the outside combustion air
valve is located on one lower side behind the
screen panel. Push the lever all the way in to
open the air valve and pull the lever all the way
out to close the air valve ( Figure 6 ).
Open
Closed
Figure 6
The outside air damper should be kept closed
on all fireplaces except when the fireplace is in
operation. If there is no heat present in the
firebox, the air damper should be closed at
night before retiring to prevent intrusion of
outside air into the home.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE
LINTEL EXTENSION
These Merit Multi-Open Factory-Built
Fireplaces were designed, tested and listed
with an 18" (457 mm) high viewing area, floor
to lintel. However, varying conditions such as
altitude, climate, wood type, moisture content
of fuel, dwelling design peculiarities, average
ambient air pressure and humidity may effect
the performance of this fireplace. If an unac-
ceptable amount of smoking occurs while the
doors are open, the adjustable lintel can be
moved to correct the smoking condition.
The lintel extension can be lowered a maxi-
mum of 2" (51 mm) using a predrilled hole
located at the top of the lintel extension. To
lower the lintel extension 1" (25 mm), drill a
1/8" (3 mm) hole where the dimple is located.
(See Figure 7 .)
To lower the lintel extension on Model CST-38,
remove the two screws from both ends of the
lintel extension (located behind the screen
assembly). Slide the lintel extension down and
align the desired holes in the lintel extension
with the holes in the lintel frame. Reattach
using the screws previously removed. Repeat
this procedure for the lintel extension on the
opposite side of the fireplace. ( Figure 7 )
Original Position
Dimple
Lintel
Extension
Figure 7
On Model CPF-38 the two (2) side lintel exten-
sions are welded to the end lintel extension. The
lintel extension lowers similarly to the CST-38
lintel extension. However, to prevent the end
lintel extension from being misshaped, follow
the following steps while referring to Figure 7 .
Front
Frame
Lintel
Frame
Lowest
Position
2" (51 mm)
5