Requirements For The Commonwealth Of Massachusetts; Cold Climate Insulation - Lennox Merit MLDVTCD-35NM Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS
Gas Pressure
Table 2 and Table 3 show the appliance
inlet and manifold gas pressure
requirements.
Table 2: Inlet Gas Supply Pressure
Fuel Minimum
4.5 in. WC
Natural Gas
(1.12 kPa)
11.0 in. WC
Propane
(2.74 kPa)
Table 3: Manifold Gas Supply Pressure
Fuel Low
2.2 in. WC
Natural Gas
(0.55 kPa)
6.3 in. WC
Propane
(1.57 kPa)
Test gauge connections are provided on
the front of the electronic gas control valve
(identified IN for the inlet and OUT for the
manifold side). The control valves have a
3/8 in. (10 mm) NPT thread inlet and outlet
side of the valve (Figure 1 and Figure 2 ).
Figure 1: SIT Millivolt Gas Valve
Main Gas Control Knob
OFF/PILOT/ON
IN OUT
Manifold Pressure Tap
Inlet Pressure Tap
Figure 2: SIT Electronic Gas Valve
Green Wire
(from DFC Wire
Inlet (IN) Test Port
Manifold (OUT)
Test Port
Orange Wire
(from DFC
Wire
Harness)
Main
Gas Inlet
3/8 in. NPT
Propane tanks are at pressures that will
cause damage to valve components. Verify
that the tanks have step down regulators to
4
reduce the pressure to safe levels.
The appliance and its appliance main gas
valve must be disconnected from the gas
supply piping system during any pressure
testing of that system at test pressures in
excess of 1/2 psi (3.5 kPa).
The appliance must be isolated from
the gas supply piping system by closing
Maximum
its equipment shutoff valve during any
pressure testing of the gas supply piping
10.5 in. WC
(2.61 kPa)
system at test pressures equal to or less
than 1/2 psi (3.5 kPa).
13.0 in. WC
(3.23 kPa)
Orifice Sizes—Sea Level to
High Altitude
These appliances are tested and approved
High
for installation at elevations of 0–4500 ft
3.5 in. WC
(0–1372 m) above sea level using the
(0.87 kPa)
standard burner orifice sizes (marked with
10.0 in. WC
an "*" in Table 4).
(2.49 kPa)
For elevations above 4500 ft, contact your
gas supplier or qualified service technician.
Deration
At higher elevations, the amount of BTU fuel
value delivered must be reduced by either:
• Using gas that has been derated by the
gas company.
• Changing the burner orifice to a
Pilot Adjustment
Screw
smaller size as regulated by the local
authorities having jurisdiction and by
the (USA) National Fuel Gas Code NFPA
54/ANSI Z223.1—latest edition or, in
Canada, the CAN/CSA-B149.1 codes—
latest edition.
NOTE: Flame breadth, height and width will
diminish 4% for every 1,000 feet of altitude.
Table 4: Burner Orifice Sizes,
HI/LO Variable
Elevation 0–4500 ft ( 0–1372 m)
Flame Height
Adjustment
Model
MLDVTCD-35
* Standard size installed at factory
Hi/Lo
• Catalog number
Flame
Control
In Canada—CAN/CGA-2.17-M91
Harness)
Knob
(high altitude):
THE CONVERSION SHALL BE CARRIED
OUT BY A MANUFACTURER'S
AUTHORIZED REPRESENTATIVE, IN
ACCORDANCE WITH THE REQUIREMENTS
OF THE MANUFACTURER, PROVINCIAL
OR TERRITORIAL AUTHORITIES HAVING
JURISDICTION AND IN ACCORDANCE
WITH THE REQUIREMENTS OF THE
CAN/CGA-B149.1 OR CAN/CGA-B149.2
INSTALLATION CODES.
Yellow Ground Wire
(from DFC
Wire Harness) REQUIREMENTS FOR THE
COMMONWEALTH OF
MASSACHUSETTS
These fireplaces are approved for
installation in the U.S. state of
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Natural Gas Propane
drill size drill size
(inches) (inches)
#49 (0.073 in.)* (0.045 in.)*
21L82• 75L10•
Massachusetts if the following additional
requirements are met:
• Install this appliance in accordance with
Massachusetts Rules and Regulations
248 C.M.R..
• Installation and repair must be done by
a plumber or gas fitter licensed in the
Commonwealth of Massachusetts.
• The flexible gas line connector used
shall not exceed 36 in. (92 cm)
in length.
• The individual manual shut-off must be
a T-handle type valve.
Massachusetts Horizontal Vent
Requirements
In the Commonwealth of Massachusetts,
horizontal terminations installed less than
seven (7) feet above the finished grade
must comply with the following additional
requirements:
• A hard wired carbon monoxide detector
with an alarm and battery back-up must
be installed on the floor level where the
gas fireplace is installed. The carbon
monoxide detector must comply with
NFPA 720, be ANSI/UL 2034 listed and
be ISA certified.
• A metal or plastic identification plate
must be permanently mounted to the
exterior of the building at a minimum
height of eight (8) feet above grade and
be directly in line with the horizontal
termination. The sign must read, in
print size no less than one-half (1/2)
inch in size, GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS.

COLD CLIMATE INSULATION

For cold climate installations, seal all cracks
around your appliance with noncombustible
material and wherever cold air could enter
the room. It is especially important to
insulate outside chase cavity between studs
and under floor on which appliance rests, if
floor is above ground level. Gas line holes
and other openings should be caulked or
stuffed with unfaced fiberglass insulation.
If the fireplace is being installed on a
cement slab in cold climates, a sheet of
plywood or other raised platform can be
placed underneath to prevent conduction
of cold transferring to the fireplace and
into the room. It also helps to sheetrock
inside surfaces and tape for maximum air
tightness and caulk firestops.