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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
These appliances comply with National Safety
Standards and are tested and listed by Omni-
Test Laboratories (Report No. 116-F-31-5) to
ANSI ZZ21.88b-2003 (in Canada, CSA-2.33b-
2003), and CAN/CGA-2.17-M91 in both USA and
Canada, as vented gas fi replace heaters.
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, or the Natural Gas and
Propane Installation Code, CSA B149.1-latest
edition. The appliance, when installed, must
be electrically grounded in accordance with
local codes or, in the absence of local codes,
the latest edition of the National Electrical Code,
ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.1 - latest editions.
GENERAL INFORMATION
Note: Installation and repair should be per-
formed by a qualifi ed service person. The
appliance should be inspected annually by a
qualifi ed 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
appliance be kept clean. See Maintenance
instructions on Page 6.
S'assurer que le brùleur et le compartiment des
commandes sont propres. Voir les instructions
d'installation et d'utilisation qui accompagnent
l'appareil.
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 traffi c and away from furniture
and draperies. Locate furniture and window
coverings accordingly.
These fi replaces are designed as supplemen-
tal heaters. Therefore, it is advisable to have
an alternate heat source when installed in a
dwelling.
Input (BTU) MAnnually-Modulated Gas
Valves (millivolt models)
NATURAL GAS
Models Input Rate
(BTU/HR)
LMDVT-3328CNM
LMDVR-3328CNM
17,500 high
11,700 low
LMDV-3530CNM
20,000 high
12,800 low
LMDV-4035CNM
27,000 high
18,500 low
Table 1
Input (BTU) MAnnually-Modulated Gas
Valves (millivolt models)
PROPANE GAS
Models Input Rate
(BTU/HR)
LMDVT-3328CPM
LMDVR-3328CPM
17,500 high
14,000 low
LMDV-3530CPM
20,000 high
15,200 low
LMDV-4035CPM
27,000 high
21,500 low
Table 2
Input (BTU) - Fixed Rate
(electronic models)
NATURAL GAS & PROPANE GAS
Models Input Rate
(BTU/HR)
LMDVT-3328CNE
LMDVR-3328CNE
17,500
LMDV-3530CNE 20,000
LMDV-4035CNM
LMDV-4035CPM
28,000
Table 3
TABLE OF CONTENTS
Safety & Warning Information ..........Page 2
Introduction ......................................Page 3
General Information ..........................Page 3
Gas Controls Access .........................Page 4
Operation/Care of Your Appliance .....Page 4
Variable Flame Adjustment ................Page 5
Maintenance ......................................Page 6
Front Glass Enclosure Panel,
Removal and Installation .................Page 6
Install Vermiculite, Volcanic Stone,
Embers & Logs .................................Page 8
Burner Flame Appearance & Sooting Page 11
Burner Flame Adjustments ................Page 12
Millivolt Appliance Checkout .............Page 12
Electronic Appliance Checkout ..........Page 12
Wiring Diagrams ...............................Page 13
Warranty ...........................................Page 13
Product Reference Information .........Page 13
Accessory Components ....................Page 14
Lighting Instructions – Millivolt ........Page 18
Lighting Instructions – Electronic .....Page 20
Maintenance Schedule ......................Page 22
Troubleshooting Guide – Millivolt .....Page 23
Troubleshooting Guide – Electronic ..Page 23
Replacement Parts List .....................Page 25
CONGRATULATIONS!
In selecting this LENNOX Direct-Vent Gas Appliance you have chosen the fi nest and most
dependable fi replace to be found anywhere. Its a beautiful, prestigious alternative to a
wood burning fi replace. Welcome to a Family of tens of thousands of satisfi ed LENNOX
Fireplace Owners.
Please carefully read and follow all of the instructions found in this manual. Please pay
special attention to the safety instructions provided in this manual. The Homeowner's
Care and Operation Instructions included here will assure that you have many years of
dependable and enjoyable service from your LENNOX product.
INTRODUCTION
The Fireplace models covered in this manual
are Direct-Vent sealed combustion gas fi replace
heaters designed for residential application.
Direct-Vent appliances operate with the com-
bustion 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.
The Millivolt appliances have a millivolt gas
control valve with piezo ignition system provides
safe, effi cient operation. If any optional acces-
sories which require electrical power are being
installed, the electrical power must be provided
at the time of appliance installation.
The Electronic appliances have an electronic
intermittent pilot system provides safe, effi cient
operation. External electrical power is required
to operate these appliances.
These appliances are designed to operate on natural
gas or propane gas only. The use of other fuels or
combination of fuels will degrade the performance
of this system and may be dangerous.
Millivolt Models - BTU Input
Millivolt models come standard with the mAnnu-
ally-modulated gas valve; fl ame appearance and
heat output can be controlled at the gas valve.
The BTU Input for millivolt models is shown in
Tables 1 & 2:
Electronic Models -
Electronic models have a fi xed rate gas valve.
The BTU Input for electronic models is shown
in Table 3: