7
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • CARE AND OPERATION INSTRUCTIONS
Orifice Sizes - Sea Level to High Altitude
(All Models): These appliances are tested and
approved for installations at elevations of 0-2000
feet (0-610 meters) above sea level using the
standard burner orifice sizes (marked with an
asterisk [*] in
Table 4)
.
At the time of installation, it must be determined
if the appliance needs to be derated. Contact
your local gas supplier for deration requirements
for your area.
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
or by changing the burner orifice 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.
Burn-in Period
During the first few fires of this appliance there
will be some odor due to the curing of the
paint and burning off of lubricants used in the
manufacturing process. Depending on your
use, the burn-in period may take a few hours
or a few days.
KEEP YOUR HOUSE WELL VENTILATED
DURING THE CURING PROCESS. THE ODOR
AND HAZE EMITTED DURING THE CURING
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR.
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
NOTICE:
A white film may develop
on the glass enclosure panel during
the first few fires as part of the burn-in
process.
The first few times you use the
fireplace, clean the glass after each use
(
AFTER THE GLASS HAS COMPLETELY
COOLED
); otherwise, the white film
will bake onto the glass and become
difficult to remove.
See glass cleaning instructions on
Page 8
.
Input (BTU/HR) - All Models
Model No.
Input (BTU/Hr)
Natural Gas
LSM40EN-PV
32,500 to 42,000
LSM45EN-PV
32,500 to 42,000
Propane Gas
(if field converted)
LSM40EN-PV field-
converted to propane
30,000 to 40,500
LSM45EN-PV field-
converted to propane
30,000 to 40,500
Table 1
BTU Input
Electronic models come standard with a
manually-modulated gas valve; flame appear-
ance and heat output can be controlled at the
gas valve. The BTU Input for these appliances
is shown in
Table 1.
Gas Pressure Requirements - All Models
Tables 2 and 3
show the appliances' gas pres-
sure requirements.
Test gauge connections are provided on the
front of the gas control valve, identified IN for
the inlet and OUT for the manifold side (see
Figure 3
on
Page 6
)
. The control valve has a
3/8" (10 mm) NPT thread inlet and outlet side
of the valve.
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
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 dur-
ing any pressure testing of that system
at pressures greater than 1/2 psig (3.5
kPa).
GENERAL INFORMATION
The fireplace models covered in this manual are
direct-vent, sealed combustion gas fireplaces
designed for residential application. Direct-
vent appliances operate with the combustion
chamber completely isolated from the indoor
environment.
All air for combustion is brought in from the
outside and exhaust gases are vented through
the same direct-vent, co-axial (intake/exhaust)
vent system.
These electronic appliances are designed to
operate on natural gas or propane and have
an electronic intermittent pilot ignition system.
External 120 Volt AC electrical power is is
required to operate these units.
These appliances comply with National Safety
Standards and are tested and listed by OMNI-
Test Laboratories, Inc. (Report No. 116-F-22-5)
to ANSI Z21.50b in the USA.
The Installation must conform to local codes or,
in the absence of local codes, with the
National
Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest
edition
. The appliance, when installed, must
be electrically grounded in accordance with
local codes or, in the absence of local codes,
with the
National Electrical Code, ANSI/NFPA
70 - latest edition
.
