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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
REQUIREMENTS FOR THE COMMON-
WEALTH OF MASSACHUSETTS
These fireplaces are approved for installation in
the US state of 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 tter licensed in the Com-
monwealth of Massachusetts.
• The exible gas line connector used shall
not exceed 36 inches (92 centimeters) in
length.
• The individual manual shut-off must be a
T-handle type valve.
Massachusetts Horizontal Vent Requirements
In the Commonwealth of Massachusetts, hori-
zontal 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
replace is installed. The carbon monoxide
detector must comply with NFPA 720, be
ANSI/UL 2034 listed and be ISA certied.
• A metal or plastic identication 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.
NEW YORK CITY, NEW YORK (MEA)
Installation of these fireplaces are approved
for installation in New York City in the US state
of New York.
Hi / Lo
Variable Flame
Height
Adjustment
Gas Supply Inlet
Manifold
Pressure
Gauge Port
Inlet Pressure
Gauge Port
Pilot
Adjustment
Screw
Gas Outlet to Burner
HI
LO
Gas Valve Diagrams
See Figure 1 for gas valve diagram.
Figure 1 - SIT Electronic Gas Valve
Test gauge connections are provided on the
front of the gas control valve (identified IN for
the inlet and OUT for the manifold side). Refer
to Figure 1.
Propane tanks are at pressures that will cause
damage to valve components. Verify that the
tanks have step down regulators to reduce the
pressure to safe levels.
Orifice Sizes - Sea Level To High Altitude
(All Models)
These appliances are tested and approved for
installation at elevations of 0-2000 feet (0-610
meters) above sea level, using the standard
burner orice sizes (marked with an "*" in Table
4). For elevations above 2000 feet, 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 orice to a 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.
Install the appliance according to the regulations
of the local authorities having jurisdiction and,
in the USA, the National Fuel Gas Code NFPA
54 / ANSI Z223.1 - latest edition.
NOTE: Flame appearance will diminish 4% per
thousand feet.
Burner Orifice Size
Elevation 0-2000 ft. (0-610m)
Model Natural Gas Propane Gas
LSM40-PV
.125" (1/8") *
H7924
•
.073" (#49)
H7936 •
LSM45-PV
.125" (1/8") *
H7924
•
.073" (#49)
H7936 •
Table 4
* Standard size installed at factory
•Part/Cat.Number
These appliances must not be connected to a
chimney or flue serving a separate solid fuel
burning appliance.
These appliances must be isolated from the
gas supply piping system (by closing their
individual manual shut-off valve) during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than 1/2 psig (3.5 kPa).
These appliances and their individual shut-off
valves must be disconnected from the gas
supply piping system during any pressure
testing of that system at pressures greater
than 1/2 psig (3.5 kPa).
PURGE CYCLE
This is a power vented fireplace that
requires household electrical power
to operate. It will not operate during
a power failure. When the fireplace
is turned off, the exhaust blower will
continue to operate for approximately
one to two minutes after shutdown
to expel the exhaust gases from the
venting system.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS
Gas Pressure - All Models
Tables 2 and 3 show the appliances' inlet and
manifold gas pressure requirements:
Inlet Gas Supply Pressure
(all models)
Fuel # Minimum Maximum
Natural Gas
5.5" WC
(1.37 kPa)
10.5" WC
(2.61 kPa)
Propane
11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 2
Manifold Gas Supply Pressure
(all models)
Fuel # Low High
Natural
Gas
(Lo) 2.2" WC
(.55 kPa)
(Hi) 3.5" WC
(.87 kPa)
Propane
(Lo) 6.3" WC
(1.57 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 3