Lennox MLDVT-30NM Installation Instructions Manual page 10

FIREPLACE FRAMING SPECIFICATIONS
M d o l e N . o
in. 30 1/4
MLDVT-30
mm
in.
35 1/4
MLDVT-35
mm
895
in.
40 1/4
MLDVT-40
mm
1022
45 1/4
in.
MLDVT-45
mm 1149
Figure 13 - Corner Framing with Horizontal Termination
Proper Sizing of Gas Line
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 7 for proper sizing of the gas sup-
ply 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.
0
A B C D
53 3/16
37 29/32 26 13/16
1350
768 963 681
57 1/2 40 5/8 28 3/4
1461
1032 730
61 13/16 43 11/32
30 11/16
1554 1101 779
32 5/8
66 1/8 46 1/16
829
1680
1170
Schedule 40 Pipe
Table 7
Notes:
• All appliances are factory-equipped with a
flexible gas line connector and 1/2 inch shutoff
valve (see Figure 37 on Page 24 ).
• See Massachusetts Requirements on Page 4
for additional requirements for installations in
the state of Massachusetts in the USA.
• The gas supply line should Not be connected
to the appliance until Step 6 (Page 24 ).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
E
12 1/4
311
13 3/4
349
15 1/8
384
16 1/2
419
Back wall of chase/enclosure
(including any finishing materials)
Schedule 40
Black Iron Pipe
Inside Diameter (Inches)
Natural
Length (feet) Gas
0-10 1/2
10-40 1/2
40-100 1/2
100-150 3/4
150-200 3/4
E
C
A
B
• A pipe joint compound rated for gas should be
used on the threaded joints. Ensure propane
resistant compounds are used in propane
applications. Be very careful that the pipe
Propane
compound does not get inside the pipe.
Gas
• It is recommended to install a sediment trap
in the supply line as close as possible to the
3/8
appliance. Appliances using Propane should
1/2
have a sediment trap at the base of the tank.
1/2
• Check with local building official for local code
requirements ( i.e. a re b elow g rade p enetrations
1/2
of the gas line allowed?, etc).
1/2
IMPORTANT: If propane is used, be aware that
if tank size is too small (i.e. under 100-lbs, if
this is the only gas appliance in the dwelling.
Ref. NPFA 58), there may be loss of pressure,
resulting in insufficient fuel delivery (which
can result in sooting, severe delayed ignition
or other malfunctions). Any damage resulting
from an improper installation, such as this, is
not covered under the limited warranty.
7 (78)
D
Inches
(millimeters)