Step 2. Routing Gas Line; Proper Sizing Of Gas Line - Lennox Montebello DLX Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO
Model
No.
in. 50-5/8
MDLX40
mm 1286
in. 56-3/4
MDLX45
mm 1441
Figure 12: Corner Framing with Square Termination (SV8HTS)

Step 2. ROUTING GAS LINE

Route a 1/2 in. (13 mm) gas line along the
inside of the right side framing as shown
in Figure 13. Gas lines must be routed,
constructed and made of materials that are
in strict accordance with local codes and
regulations.
All appliances are factory-equipped with
a flexible gas line connector and 1/2 inch
shutoff valve. (See Step 6 on Page 22).
The incoming gas line should be piped into
the valve compartment and connected in one
of the two methods as shown in Figure 36
on Page 23.
Figure 13

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).
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
A B C
83-5/8 59-1/8 41-7/8
2124 1502 1064
89-7/8 63-1/2 44-7/8
2283 1613 1140
Never use galvanized or plastic pipe. Refer to
Table 6 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.
Schedule 40 Pipe
Length (feet)
0–10
10–40
40–100
100–150
150–200
Table 6: Schedule 40 Black Iron
Pipe—Inside Diameter
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
D
C
Back wall of chase/enclosure
(including any finishing materials)
Natural Propane
Gas Gas
1/2 in. 3/8 in.
1/2 in. 1/2 in.
1/2 in. 1/2 in.
3/4 in. 1/2 in.
3/4 in. 1/2 in.
A
B
Notes:
• All appliances are factory-equipped with
a flexible gas line connector and 1/2 inch
shutoff valve (see Figure 36 on Page 23).
• 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 23).
• 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 compound does not
get inside the pipe.
• It is recommended to install a sediment
trap in the supply line as close as possible
to the appliance (see Figure 36 on
Page 23).
• Check with local building official for local
code requirements.
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.
D
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