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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX MERIT
®
SERIES B-VENT GAS FIREPLACES • 36" LMBV MODELS • CARE AND OPERATION INSTRUCTIONS
TABLE OF CONTENTS
Introduction ......................................page 2
General Information ..........................page 2
Operation/Care of Your Appliance .....page 3
Damper & Outside Air Controls .........page 4
Manual Limit Switch .........................page 5
Maintenance ......................................page 6
Millivolt Appliance Checkout .............page 6
Attaching "Safety-in-Operation"
Warnings ............................ page 6
Electronic Appliance Checkout ..........page 7
Maintenance Schedule ......................page 8
Log and Rockwool Placement ...........page 9
Wiring Diagrams ...............................page 10
Lighting Instructions – Millivolt ........page 11
Lighting Instructions – Electronic .....page 13
Troubleshooting Guide – Millivolt......page 15
Troubleshooting Guide – Electronic ..page 16
Warranty ...........................................page 17
Product Reference Information .........page 17
Replacement Parts ............................page 17
Accessory Components ....................page 18
Replacement Parts List .....................page 19
These appliances are designed to operate on
natural or propane gas only. The use of other
fuels or combination of fuels will degrade the
performance of this system and may be dan-
gerous.
CONGRATULATIONS!
In selecting this LENNOX B-vented gas appliance, you have chosen one of the finest
and most dependable fireplaces available. This gas fireplaces is a beautiful, prestigious
alternative to a wood burning fireplace. Welcome to a family of tens of thousands of
satisfied LENNOX fireplace owners.
Please read and carefully follow all of the instructions found in this manual. Please
pay special attention to the safety instructions provided in this manual. The Care and
Operation Instructions included herein will help to ensure many years of dependable and
enjoyable service from your LENNOX product.
INTRODUCTION
The millivolt appliances are designed to operate
on either natural or propane gas. A millivolt gas
control valve with piezo ignition system provides
safe, efficient operation.
The electronic appliances are designed to
operate on either natural or propane gas. An
electronic intermittent ignition system provides
safe, efficient operation. External electrical
power is required to operate these units.
These appliances comply with National Safety
Standards and are tested and listed by Warnock
Hersey (Report No. 3106807) to ANSI Z21.50
- latest edition (in Canada, CSA 2.22 - latest
edition), and CAN/CGA-2.17-M91 in both USA
and Canada, as vented gas fireplaces.
Installation must conform to local codes. In
the absence of local codes, installation must
comply with the current National Fuel Gas Code,
ANSI Z223.1 (NFPA 54). (In Canada, the current
CAN/CGA B149 installation code.) Electrical
wiring must comply with local codes. In the
absence of local codes, installation must be in
accordance with the National Electrical Code,
NFPA 70 - (latest edition). (In Canada, the current
CSA C22.1 Canadian Electric Code.)
GENERAL INFORMATION
Note: Installation and repair should be per-
formed by a qualified service person. The
appliance should be inspected annually by a
qualified professional service technician. More
frequent inspections and cleanings may be
required due to excessive lint from carpeting,
bedding material, etc. It is imperative that the
control compartment, burners and circulating
air passage ways of the appliance be kept clean.
S'assurer que le brùleur et le compartiment des
commandes sont propres. Voir les instructions
d'installation et d'utilisation qui accompagnent
l'apareil.
Provide adequate clearances around air open-
ings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front openings of the appliance.
Due to high temperatures the appliance should
be located out of traffic and away from furniture
and draperies. Locate furniture and window
coverings accordingly.
Gas Orifice
Type Size Elevation
0 - 4500'
(0 - 1370 m)
0 - 4500'
(0 - 1370 m)
Natural
Propane
(.058)
#42
(.0935)
WARNING: THESE FIREPLACES ARE
VENTED DECORATIVE GAS APPLIANCES.
DO NOT BURN WOOD OR OTHER MATE-
RIAL IN THESE APPLIANCES.
Nominal operating pressures for the manifold
side of the gas control system are; 3.5 inches
water column (0.87 kPa) for natural gas models
and 10 inches water column (2.49 kPa) for
propane gas models.
Test gage connections are provided on the front
of the millivolt gas control valve (identified E
for the inlet and A for the manifold side, see
Figure 2 ). A 1/8" NPT test gage connection
is provided at the inlet and manifold side of
the electronic gas control valve (Figure 3 ).
Minimum inlet gas pressure to the appliance is
4.5 inches water column (1.24 kPa) for natural
gas and 11 inches water column (2.74 kPa) for
propane for the purpose of input adjustment.
Maximum inlet gas supply pressure to the ap-
pliance is 10.5 inches water column (2.62 kPa)
for natural gas and 13.0 inches water column
(3.23 kPa) for propane.
The appliance must be isolated from the gas
supply piping system (by closing its 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).
The appliance and its individual shut-off valve
must be disconnected from the gas supply
piping system during any pressure testing of
that system at pressures in excess of 1/2 psig
(3.5 kPa).
These appliances must not be connected to a
chimney or flue serving a separate solid fuel
burning appliance.
Input of appliance is 24,000 BTU/HR.
WARNING
B-Vent appliances are not designed
to operate in negatively pressured
environments (pressure within
the home is less than pressures
outside). Signicant negatively
pressured environments caused
by weather, home design, or
other devices may impact the
operation of these appliances.
Negative pressures may result in
poor ame appearance, sooting,
damage to property and/or severe
personal injury. Do not operate
these appliances in negatively
pressured environments.
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 qualied installer,
service agency or the gas supplier.
DO NOT ATTEMPT TO ALTER OR MODIFY
THE CONSTRUCTION OF THE APPLIANCE OR
ITS COMPONENTS. ANY MODIFICATION OR
ALTERATION MAY VOID THE WARRANTY,
CERTIFICATION AND LISTINGS OF THIS UNIT.