LG MAGNA-FIRE LS43ST - Manual (Page 17)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 17
CAUTION: NEVER LOCATE THE AIR INLET
WHERE IT COULD BE BLOCKED BY SHRUBS,
SNOW DRIFTS, ETC. NEVER LOCATE THE
AIR INLET IN GARAGE OR ANY AREA WHERE
THERE IS ANOTHER FUEL BURNING APPLI-
ANCE OR PRODUCTS EMITTING COMBUS-
TIBLE GASES SUCH AS PAINT, GASOLINE,
ETC. IN COLD CLIMATES, IT IS RECOM-
MENDED THAT THE COMBUSTION AIR DUCT
BE INSULATED.
Note: Do not terminate combustion air kit in
attic space under any circumstances.
CAUTION: IN NO EVENT MAY THE TOTAL DUCT
FOR BRINGING IN OUTSIDE AIR EXCEED 50'
(15.2 M).
GAS LINE INSTALLATION
The LS43ST fireplace has been approved to
accept a
¹⁄₂" (13 mm) gas line for an approved
gas appliance. Always have the appliance in-
stalled by a qualified, licensed plumber in ac-
cordance with all local building codes. The gas
line may enter either end of the fireplace.
CAUTION: PLUMBING CONNECTIONS SHOULD
ONLY BE PERFORMED BY A QUALIFIED, LI-
CENSED PLUMBER. MAIN GAS SUPPLY MUST
BE OFF WHEN PLUMBING GAS LINE TO FIRE-
PLACE OR PERFORMING SERVICE.
If you’re installing a gas line, connect it before
the fireplace is framed and enclosed in the
finished wall. The gas knockout is determined
by a 1
¹⁄₈" (29 mm) round indentation located
at the bottom and slightly off center in the side
refractories. THE KNOCKOUT IS ALWAYS RE-
MOVED FROM INSIDE THE FIREPLACE. DO
NOT REMOVE THE KNOCKOUT UNLESS YOU
ARE INSTALLING A GAS LINE. If removal is
attempted from the outer wrapper, side-re-
fractory damage may occur. With a medium-
sized hammer, lightly tap the surface of the
indentation. The refractory material is very
thin in this area and is easily removed. Once a
small hole has been made, continue tapping
until you have reached sufficient diameter for
the gas line to fit through. The entire knockout
does not have to be removed. Remove insula-
tion in the gas line channel.
Install a ¹⁄₂" (13 mm) gas supply line through
fireplace wall for connection to a decorative
gas appliance inside the firebox. Outside, the
gas supply line must connect to a gas shut-off
valve usually recessed flush into the wall or
floor. The valve should be controlled by a
removable valve key for safety.
Always plumb gas line installation per local
codes. Check all connections with soap suds;
leaks will bubble. Never test any gas line con-
nection with a match or open flame.
IMPORTANT: REPACK INSULATION MATERIAL
IN SQUARE HOLE AROUND GAS LINE, INTE-
RIOR AND EXTERIOR, TO SEAL.
This provision is intended for connection to a
decorative gas appliance incorporating an au-
tomatic shut-off device and complying with the
Standard for Decorative Gas Appliances for
installation in vented fireplaces, ANSI Z21.60
(1991) or American Gas Association draft re-
quirements for Gas-Fired Log Lighters for Wood
Burning Fireplaces, Draft No. 4 dated August,
1993. Install in accordance with the National
Fuel Gas Code, ANSI Z223.1. This complies
with the revised U.L. 127 standard.
CAUTION: WHEN USING THE DECORATIVE
GAS APPLIANCE, THE FIREPLACE DAMPER
MUST BE SET IN THE FULLY OPEN POSITION.
Vent Free Appliances
These units have been tested and approved to
ANSI/IAS/AGA Z21.11.2 for use with unvented
gas appliances and complies with the stan-
dard for Factory-Built fireplaces, UL 127.
The unit has been tested for use with any
unvented gas log sets having a maximum rating
of 40,000 BTU. The minimum mantle configu-
rations are outlined in
Figure 47.
These fireplaces have been marked with a
maximum rating of 40,000 BTU to assure that
homeowners do not exceed the allowable lim-
its for all allowed installations of mantles.
NEVER INSTALL AN UNVENTED GAS LOG
SET WITH A BTU GREATER THAN 40,000.
COLD CLIMATE INSULATION
If you live in a cold climate, it is especially
important to seal all cracks around the fire-
place and wherever cold air could enter the
room with noncombustible material. Surround
material must be caulked where it meets the
black metal facing of the fireplace to avoid
cold air intrusion. Use noncombustible caulk-
ing material only on fireplace facing to seal.
Also, the outside air inlet duct should be
wrapped with noncombustible insulation to
minimize the formation of condensation. Do
not place insulation materials directly against
the chimney sections.
Note: 2" (51 mm) air space must be preserved
for all materials extending for any continuous
length adjacent to the chimney.
It is especially important to insulate between
the studs of an outside chase cavity and under
the floor if the floor is above ground level. Do
not place insulation directly against the fire-
place or chimney system.
FIREPLACE FINISHES
Mantels and Trim
It is sometimes best to frame your fireplace
after it is positioned and the chimney is in-
stalled. Frame enclosure for chimney and
fireplace with 2 x 4’s (or heavier) lumber.
Note: The header may rest on the two (2) metal
top spacers on top of the unit but the header
must not be notched to fit around the spacers.
In installations, combustible mantels and trim
may be installed 12" (305mm) above the open-
ing as per NFPA 211, Section 7-3.3.3. and
Figure 47. If a mantel is of a noncombustible
material, it is exempt from the requirements as
long as it does not interfere with the operation
of glass doors.
12"
(305 mm)
Min.
11 ¹⁄₂"
(292 mm)
Finished Wall
Spacer
Combustible
Mantel
and Trim
8"
(203 mm)
Max.
False
Header
Typical Installation
1 ¹⁄₂"
(38 mm)
Fireplace Opening
Hearth Extensions and Wall Shields
A hearth extension must be installed with
all fireplaces. It is to protect the combustible
floor in front of the fireplace from both radiant
heat and sparks. The hearth extension must
extend 12" beyond both sides of the fireplace
opening and 20" beyond the front (
see Figure
48 ). Use a hearth extension constructed of a
durable noncombustible material having an
equal or better (lower k value) insulating value
of k = .84 BTU IN/FT
2 HR
°
F or a thermal
resistance that equals or exceeds r = 1.19 HR
° F FT 2 /BTU IN. With these values, determine
the minimum thickness/material required us-
ing the formula and
Page 18.
Note: Any noncombustible material whose k
value is less than .84 or whose r value is more
than 1.19 is acceptable.
If the fireplace is installed on a combustible
floor, use the metal safety strips (provided)
on the floor extending half under the fire-
place and half under the hearth extension
(refer to
Figures 6 & 7).
Figure 47