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The Millivolt appliances have a millivolt gas
control valve with piezo ignition system provides
safe, efficient 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 a battery backed
up electronic intermittent pilot system that
provides safe, efficient operation. No external
electrical power is required to operate these
appliances.
These appliances comply with National Safety
Standards and are tested and listed by Omni-
Test Laboratories (Report No. 116-F-50-5)
to ANSI ZZ21.88 (in Canada, CSA-2.33), and
CAN/CGA-2.17-M91 in both USA and Canada,
as vented gas fireplace 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 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
appliance be kept clean. See Maintenance
instructions on Page 5.
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.
TABLE OF CONTENTS
Introduction ......................................Page 2
General Information ..........................Page 2
Gas Controls Access .........................Page 3
Operation/Care of Your Appliance .....Page 3
Variable Flame Adjustment ................Page 4
Maintenance ......................................Page 5
Front Glass Enclosure Panel,
Removal and Installation .................Page 6
Install Volcanic Stone,
Embers & Logs ..............................Page 7
Burner Flame Appearance & Sooting Page 10
Burner Flame Adjustments ................Page 10
Millivolt Appliance Checkout .............Page 11
Electronic Appliance Checkout ..........Page 11
Product Reference Information .........Page 11
Warranty ...........................................Page 11
Wiring Diagrams ...............................Page 12
Accessory Components ....................Page 13
Lighting Instructions – Millivolt ........Page 16
Lighting Instructions – Electronic .....Page 18
Maintenance Schedule ......................Page 20
Troubleshooting Guide – Millivolt......Page 21
Troubleshooting Guide – Electronic ..Page 22
Replacement Parts List .....................Page 23
CONGRATULATIONS!
In selecting this LENNOX Direct-Vent Gas Appliance you have chosen the finest and most
dependable fireplace to be found anywhere. Its a beautiful, prestigious alternative to a
wood burning fireplace. Welcome to a Family of tens of thousands of satisfied 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 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 fireplace
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.
Due to high temperatures the appliance should
be located out of traffic and away from furniture
and draperies. Locate furniture and window
coverings accordingly.
These fireplaces are designed as supplemen-
tal heaters. Therefore, it is advisable to have
an alternate heat source when installed in a
dwelling.
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 manu
-
ally-modulated gas valve; flame appearance and
heat output can be controlled at the gas valve.
The BTU Input for millivolt models is shown
in
Tables 1 & 2.
Gas Pressure -
Tables 3, 4 and 5 show the appliances' gas
pressure requirements.
This manual is part of a set of two supporting
this product. Refer to manual 506009-01 for
Installation Instructions.
Inlet Gas Supply Pressure
(all models)
Fuel # Minimum Maximum
Natural Gas
4.5" WC
(1.24 kPa)
10.5" WC
(2.61 kPa)
Propane
11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 3
Input (BTU) Manually-Modulated
Gas Valves (millivolt models)
NATURAL GAS
Models Input Rate (BTU / HR)
SLDVT-35NM
*16,000 high
12,750 low
SLDVT-40NM
*20,000 high
15,500 low
Table 1
Input (BTU) Manually-Modulated
Gas Valves (millivolt models)
PROPANE GAS
Models Input Rate (BTU / HR)
SLDVT-35PM
*15,000 high
11,400 low
SLDVT-40PM
*18,000 high
14,000 low
Table 2
* Electronic Models Fixed
* Electronic Models Fixed