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WARNING
Improper installation, adjustment,
alteration, service or maintenance
can cause injury or property
damage. Refer to this manual. For
assistance or additional informa-
tion consult a qualified installer,
service agency or the gas supplier.
WARNING
Failure to comply with these
installation instructions will
result in an improperly installed
and operating appliance, voiding
its warranty. Any change to this
appliance and/or its operating
controls is dangerous.
WARNING
Improper installation or use of
this appliance can cause serious
injury or death from fire, burns,
explosion or carbon monoxide
poisoning.
Note: Installation and repair should be done
by a qualified service person. The appliance
should be inspected before use and at least
annually by a professional service person.
More frequent cleaning may be required due
to excessive lint from carpeting, bedding
material, etcetera. It is imperative that control
compartments, burners and circulating air
passageways of the appliance be kept clean.
Remarque : L’installation et la répara-
tion devrait être confiées à un technicien
qualifié. L’appareil devrait faire l’objet
d’une inspection par un technicien profes-
sionnel avant d’être utilisé et au moins
une fois l’an par la suite. Des nettoyages
plus fréquents peuvent être nécessaires si
les tapis, la literie, et cetera produisent
une quantité importante de pous-sière.
Il est essentiel que les compartiments
abritant les commandes, les brûleurs
et les conduits de circulation d’air de
l’appareil soient tenus propres.
Do not use these appliances if any part
has been under water. Immediately call a
qualified, professional service technician to
inspect the appliance and to replace any parts
of the control system and any gas control
which have been under water.
Ne pas utiliser cet appareil s’il a été
plongé, même partiellement, dans
l’eau. Appeler un technicien qualifié pour
inspecter l’appareil et remplacer toute
partie du système de commande et toute
commande qui a été plongée dans l’eau.
Only trim kit(s) supplied by the manufacturer
shall be used in the installation of this ap-
pliance.
Seules les trousses de garniture fournies
par le fabricant doivent être utilisées pour
l’installation de cet appareil.
These appliances comply with National Safety
Standards and are tested and listed by Intertek
(Report No. 100326523PRT-001) to ANSI
Z21.88 (in Canada, CSA-2.33), and CAN/CGA-
2.17-M91 (CSA P4.1) in both USA and Canada,
as vented gas fireplace.
These appliances are listed by Intertek for
installation in bedrooms, aftermarket mobile
homes, and manufactured homes.
Misc. Codes/Standards
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 (in Canada, the current CAN/CSA-B149.1
installation code).
The appliance, when installed, must be electri-
cally grounded and wired in accordance with
local codes or, in the absence of local codes,
with the National Electrical Code, ANSI/NFPA
70 - latest edition, or the Canadian Electrical
Code, CSA C22.1 - latest edition.
WARNING
Clothing or other flammable
material should not be placed on
or near the appliance.
AVERTISSEMENT
On ne devrait pas placer de vête-
ments ni d’autres matières inflam-
mables sur l’appareil ni à proximité.
WARNING
Any safety screen or guard
removed for servicing the appli-
ance must be replaced prior to
operating the appliance.
AVERTISSEMENT
Tout écran ou protecteur retiré pour
permettre l’entretien de l’appareil
doit être remis en place avant de
mettre l’appareil en marche.
Provide adequate clearances around air open-
ings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front or back openings of the appliance.
These appliances are designed to operate on
natural or propane gas only. The use of other
fuels or combination of fuels will degrade the per-
formance of this system and may be dangerous.
The system is switchable between standing
and intermittent pilot modes. External electri-
cal power is required to operate these units.
If the system operates on line voltage, four “AA”
batteries (in receiver) can be used as a backup
in case of a power outage.
These models come standard with a remotely
modulated gas valve. The included transmitter
remotely controls flame appearance and heat
output (manual gas valve adjustment is not
possible).
Inputs and Efficiencies
Appliance BTU inputs are listed in Table 1A.
Appliance efficiencies are listed in Table 1B.
Gas Fireplace Energy Efciency Rating
Based on CSA P.4.1-02
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS
Inlet Gas Supply Pressure (all models)
Fuel # Minimum Maximum
Natural Gas
5.0" WC
(1.24 kPa)
10.5" WC
(2.61 kPa)
Propane
11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 2
Gas Supply Pressure Requirements
Inlet and manifold gas supply pressure require-
ments for these appliances are listed in Tables
2 and 3.
Manifold Gas Supply Pressure (all models)
Fuel # Low High
Natural
Gas
(Lo) 1.6" WC
(0.4 kPa)
(Hi) 3.5" WC
(0.87 kPa)
Propane
(Lo) 6.3" WC
(1.57 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 3
(Continued on next page)
INPUTS
Gas Type (Fireplace Model) Inputs (BTU/hr)
Natural Gas (LSM40ST-N) 40,000 to 60,000
Liquid Propane (LSM40ST-P) 43,500 to 56,000
Table 1A
EFFICIENCIES
Gas Type (Fireplace Model)
AFUE EnerGuide
Natural Gas (LSM40ST-N) 68% 67%
Liquid Propane (LSM40ST-P) 70% 67%
Table 1B