Routing Gas Line - Lennox Merit MLDVT-35NM-FB Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT
Table 11: Fireplace Specifications
K
L
*CONCENTRIC FLUE
1/2
(13)
Top View
Model
in.
MLDVT-30
mm
in.
MLDVT-35
mm
in.
MLDVT-40
mm
in.
MLDVT-45
mm
Table 12: Thermal Efficiency (%)
Natural Gas
Model
AFUE P4
MLDVT-30 62 51
MLDVT-35 63 59
MLDVT-40 65.8 61
MLDVT-45 68.1 59
Figure 10: Unit Secured to Framing by
Nailing Flange
NOTE: Bend up the appropriate
header spacing top standoffs
Header Spacing Top Standoffs
before installing the fireplace.
(two pairs on front edge of firebox top)
Lift up outer pair for
1/2 in. finish materials Lift up inner pair for
5/8 in. finish materials
Unit Nailing
Side (No clearance to
Framing
combustible framing
is required)
SERIES DIRECT-VENT GAS FIREPLACES • MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS
®
J
E
FLUE: 4 1/2 (114)
COMBUSTION AIR:
7 1/2 (190)
H
9 1/4 (235)
M
Front View
E F
32 1/4 28 1/8
819 714
32 1/4 28 1/8
819 714
37 1/4 33 1/8
946 841
37 1/4 33 1/8
946 841
NOTE: The nailing flanges, combustible
members, and screw heads in areas directly
adjacent to the nailing flanges are EXEMPT
Propane
from the 1/2 in. (13 mm) clearance to
AFUE P4
combustible requirements for the firebox
outer wrapper.
62.8 54
Combustible framing may be in direct
63.2 61
contact with the nailing flanges and may be
66.6 61
located closer than 1/2 in. (13 mm) from
screw heads and the firebox wrapper in
68.9 61
areas adjacent to the nailing flanges.
Frame the opening to the exact dimensions
specified in the framing details in
this manual.
Vertical Venting through the Ceiling
Use a plumb line from the ceiling above
the appliance to locate center of the
vertical run. Cut and/or frame an opening,
10 1/2 x 10 1/2 in. (267 x 267 mm) inside
dimensions, about this center mark
(Figure 14).
Route the Gas Line
Route a 1/2 in. (13 mm) gas line to the
left side of the appliance as shown in
Figure 11. Gas lines must be routed,
constructed, and made of materials that
Flange are in strict accordance with local codes
and regulations. All appliances are factory-
equipped with a flexible gas line connector
and 1/2 in. shutoff valve. (see Connect the
Gas Line on Page 24).
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: It is recommended that the gas be stubbed in from the left
side only.
ELECTRICAL INLET
KNOCKOUT - 2-3/4 X 2
(70 X 51) COVER PLATE
(With KNOCKOUT -
Right Side Only)
GAS INLET
KNOCKOUT
(Either Side)
G
OPTIONAL
F
ELECTRICAL
INLET KNOCKOUT,
REQUIRING A FIELD
PROVIDED
JUNCTION BOX
(Either Side)
3 (76)
G H
23 1/4 27 30 1/4
590 686
23 1/4 32 35 1/4
590 813
28 1/4 37 40 1/4
718 940 1022
28 1/4 42 45 1/4
718 1067 1149
EYEBROW
HOOD
16 (406)
5 7/8
(149)
9 1/2
(241)
1 5/8 (42)
5.125
3 (76) (130.2)
0.5 (12.7)
Right Side View
J K
20 10
768 508 254
25 12 1/2
895 635 317
30 15
762 381
35 17 1/2
889 445
Figure 11: Route the Gas Line
Also see Table 11.
Properly size and route the gas supply
line from the supply regulator to the area
where the appliance is to be installed per
requirements outlined in the National Fuel
Gas Code, NFPA 54—latest edition (USA) or
CAN/CSA-B149.1—latest edition (Canada).
Never use galvanized or plastic pipe.
Refer to Table 13 for proper sizing of
the gas supply line, if black iron pipe is
being used. Gas lines must be routed,
constructed and made of materials that
are in strict accordance with local codes
and regulations. We recommend that a
qualified individual such as a plumber or
gas fitter be hired to correctly size and
route the gas supply line to the appliance.
Installing a gas supply line from the fuel
supply to the appliance involves numerous
considerations of materials, protection,
sizing, locations, controls, pressure,
sediment, and more. Certainly no one
unfamiliar and unqualified should attempt
sizing or installing gas piping.
BLOWER
ACCESS PANEL
0.525 (13.3)
Left Side View
L M
28
711
33
838
38
965
43
1092
11