Step 2. Routing Gas Line; Step 3. Install The Vent System - Lennox MPD35ST-NM-B Installation Instructions Manual

Merit plus series direct vent gas fireplace heaters
Hide thumbs Also See for MPD35ST-NM-B:
Table of Contents

Advertisement

Step 2. ROUTING GAS LINE

Route a gas line along the inside of the right side
framing as shown in Figure 14. Gas lines must
be routed, constructed and made of materials
that are in strict accordance with local codes
and regulations.
5 5/8"
(43 mm)
Figure 14 -
ROUTE GAS LINE
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 B149 - latest edition
(Canada). Never use galvanized or plastic pipe.
Refer to Table 8 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 / Black Iron Pipe
Inside Diameter (Inches)
Schedule 40 Pipe
Natural
Length (feet)
Gas
0-10
1/2
10-40
1/2
40-100
1/2
100-150
3/4
150-200
3/4
Table 8
Notes:
• All appliances are factory-equipped with a
flexible gas line connector and 1/2 inch shutoff
valve (see Figure 48 on Page 27 ).
• 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 27).
• A pipe joint compound rated for gas should be
used on the threaded joints. Ensure propane
resistant compounds are used in propane
3-/8"
applications. Be very careful that the pipe
(79 mm)
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 48 ). Appliances using
Propane should have a sediment trap at the
base of the tank.
• Check with local building official for local code
requirements (i.e. are below grade penetrations
of the gas line allowed?, etc.).
IMPORTANT: If propane is used,
be aware that if tank size is too
small (i.e. under 00-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.
Propane
Gas
3/8
1/2
1/2
1/2
1/2
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Step 3. INSTALL THE VENT SYSTEM

GENERAL INFORMATION
These instructions should be used as a guideline
and do not supersede local codes in any way.
Install vent according to local codes, these
instructions, the current National Fuel Gas
Code (ANSI-Z223.1) in the USA or the current
standards of CAN/CGA-B149.1 and -B149.2
in Canada.
Use only approved venting components.
See Approved Vent Components, Page 2.
WARNING: DO NOT use any other
manufacturer's vent components
with appliance.
The vent system must NOT service multiple
appliances, and must never be connected to a
flue serving a solid fuel burning appliance. The
vent pipe is tested to be run inside an enclosure
(such as a chase). There is no requirement for
inspection openings in the enclosure at any of
the joints in the vent pipe.
WARNING: Under no circum-
stances, may separate sections
of concentric flexible vent pipe be
joined together.
WARNING: These fireplaces must
be vented directly to outside atmo-
sphere.


Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents