Lennox Hearth Products Designer DBV User manual

Report No. 050-S-6c-5
INSTALLATION AND OPERATION MANUAL
WARNINGS
• Hot! Do not touch! The glass and surfaces of this appliance will be hot during operation and will
retain heat for a while after shutting off the appliance. Severe burns may result.
• Carefully supervise children in the same room as appliance.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable
vapors or liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS:
• DO NOT light any appliance.
• DO NOT touch any electrical switches.
• DO NOT use any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow your gas supplier's
instructions.
• If your gas supplier cannot be reached, call
the fire department.
Installationandservicemustbeperformedbyaquali-
fied installer, service agency or the gas supplier.
POURVOTRESÉCURITÉ: Nepasentreposerniutiliserd'essence
ni d'autres vapeurs ou liquides inflammables à proximité de
cet appareil ou de tout autre appareil.
POUR VOTRE SÉCURITÉ: Que faire si vous sentez une odeur
de gaz:
• Ne pas tenter d'allumer d'appareil.
• Ne touchez à aucun interrupteur.
• Ne pas vous servir des téléphones se trouvant dans le bâti-
ment
• Appelez immédiatement votre fournisseur de gaz depuis un
voisin. Suivez les instructions du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de gaz, appelez
le service des incendies.
L'installation et l'entretien doivent être assurés par un
installateur ou un service d'entretien qualifié ou par le
fournisseur de gaz.
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or loss
of life.
AVERTISSEMENT:Assurez-vousdebiensuivrelesinstruc-
tionsdonnées danscettenoticepourréduireauminimum
le risque d’incendie ou d’explosion ou pour éviter tout
dommage matériel, toute blessure ou la mort.
• Suitable for installation into masonry or factory built fireplaces. These appliances may be installed in an after-
market permanently located, manufactured (mobile) home, where not prohibited by local codes. This appliance
is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with
other gases unless a certified kit is used.
• Lennox™ gas-burning appliances are designed for use as a supplemental heater. They are not intended for
continuous use as a primary heat source.
Designer™ (DBV)
In the Commonwealth of Massachusetts:
• Installation must be performed by a licensed plumber or gas tter
• See Table of Contents for location of additional Commonwealth of
Massachusetts requirements
B-Vent Gas
Fireplace Inserts
Retain These Instructions For Future Reference
A French manual is available upon request. Order P/N 775,220CF.
Ce manuel d’installation est disponible en francais, simplement
en faire la demande. Numéro de la pièce 775,220CF.
P/N 775,220M Rev. A, 05/2007

2
Table of Contents
Cautions & safety ..................................................................................... 3
orifiCe size / altitude adjustment .................................................................... 4
fireplaCe requirements ................................................................................ 4
Codes & approvals..................................................................................... 4
requirements for the Commonwealth of massaChusetts ........................................ 4
pre-installation......................................................................................5-7
features............................................................................................ 5
paCkaging list ..................................................................................... 5
ratings ............................................................................................. 5
insert & fireplaCe dimensions .................................................................... 6
ClearanCes to Combustibles ....................................................................... 7
insert leveling ..................................................................................... 7
installation......................................................................................... 8-11
venting installation ............................................................................... 8
flue Collar ConneCtion ........................................................................... 8
extended draft hood .............................................................................. 8
zero ClearanCe fireplaCe installation ................................................................ 9
log set & ember installation ..................................................................... 9
surround panels installation ....................................................................11
faCe installation..................................................................................11
gas line installation..................................................................................12
gas pressure requirements ......................................................................12
gas supply line sizing............................................................................12
lp & natural gas supplies ......................................................................13
air shutter adjustment ..........................................................................13
operating instruCtions............................................................................14-17
pre-lighting CheCklist ...........................................................................14
lighting instruCtions .............................................................................14
flame Color & behavior..........................................................................15
replaCing burner orifiCes........................................................................15
paint Curing ......................................................................................16
quiet operation ...................................................................................16
“on-off” switCh and thermostat ...............................................................16
pilot adjustment .................................................................................16
millivolt Control system ........................................................................17
maintenanCe & serviCing..........................................................................18-20
maintenanCe CheCklist............................................................................18
glass maintenanCe................................................................................18
door removal.....................................................................................19
blower removal ..................................................................................19
fuel Conversion & Cassette installation ........................................................20
troubleshooting.......................................................................................21
replaCement parts ....................................................................................22
insert labels ......................................................................................23-24
produCt referenCe information.......................................................................25

3
FOR YOUR SAFETY do not install or operate your De-
signer™gasinsertwithoutfirstreading&understanding
this manual. Any installation or operation of the appli-
ance deviating from that which is stated in this manual
WILL void the warranty & may be hazardous.
INSTALLATION & REPAIR SHOULD ONLY BE DONE BY
A QUALIFIED SERVICE TECHNICIAN. DO NOT ATTEMPT
TO SERVICE THE APPLIANCE YOURSELF.
The insert should be inspected & cleaned before use
& at least annually by a qualified service technician.
More frequent cleaning may be required due to exces-
sive lint from bedding material, carpeting, etc.
It is imperative that control compartments, burners, &
circulating air passageways of the room heater be kept
clean.
Adequate clearances around the combustion chamber
and accessibility clearances for servicing & proper
operation must be maintained.
Turn off the gas before servicing this appliance. It is
recommended that a qualified service technician per-
form an appliance check-up at the beginning of each
heating season.
All installations must conform with all local, state,
& national codes. In the absence of local codes, the
installation must conform with National Fuel Gas Code
ANSI Z223.1-latest edition, also known as NFPA 54 (In
Canada,thecurrentCAN/CSA B149.1installationcode).
Refer to the National Fuel Gas Code & local zoning &
codeauthoritiesfordetailsoninstallationrequirements.
Your Designer gas insert must be vented to the outside
in accordance with the latest edition of the National
Fuel Gas Code.
This gas insert MUST be vented directly to the outside
& MUST NEVER be attached to a chimney serving a
separate solid fuel burning appliance. Each gas appli-
ance MUST USE a separate vent system. Common vent
systems are PROHIBITED.
This appliance uses room air for combustion. It is im-
perative that provisions for adequate combustion and
ventilationairbemade. ThisapplianceisNOTdesigned
to and will not operate in a negative pressure. Contact
your dealer if you suspect such a situation exists.
MobilehomeinstallationsmustconformwiththeMobile
Home Construction and Safety Standard, Title 24 CFR,
Part3280(inCanadaCAN/CSAZ240MH),or, when such
a standard is not applicable, the Standard for Mobile
Home Installations, ANSI A225.1 - latest edition.
The appliance, when installed, must be electrically
grounded in accordance with local codes or in the ab-
sence of local codes, with the National Electrical Code,
ANSI/NFPA 70 - latest edition. In Canada, the current
CSA C22-1 Canadian Electrical Code - latest edition.
Your Lennox™ gas insert must be equipped for the
proper fuel type & altitude at which it will be operated.
Any operation outside the parameters outlined in this
manual may result in a hazardous condition & will void
thewarranty.Pleasecarefullyreadthesectionspertain-
ing to these subjects and/or be sure your appliance is
properly equipped.
Do not use this insert if any part has been under water.
Immediatelycallaqualifiedservicetechniciantoinspect
theappliance&to replace anypartofthe control system
& any gas control which has been under water.
Due to high temperatures, the insert should be located
out of traffic areas & away from furniture & draper-
ies.
Children & adults should be alerted to the hazards of
high surface temperature & should stay away to avoid
burns or clothing ignition. Young children should be
carefully supervised when they are in the same room as
the Lennox gas insert. Clothing or any other flammable
material should not be placed on or near the insert.
Never use solid fuels such as wood, paper, cardboard,
coal, or any flammable liquids, etc., in this appli-
ance.
Any grill, panel, or glass removed for service MUST be
replaced prior to operating the insert. Do not operate
appliance with the glass front removed, cracked or
broken. Replacement of the glass should be done by a
qualified service technician.
DO NOT USE abrasive cleaner on the glass door assem-
bly. DO NOT ATTEMPT to clean the glass door when it
is hot.
Gold & nickel plated surfaces must be cleaned with
glass cleaner & a clean soft cloth before firing the first
timeorfingerprintswillremainpermanently.NEVERuse
brass polish to clean gold or nickel, this will remove
the plating!!!
When opening the lower door on the face while the
insert is burning, pull at the far left or far right vent
openings, because the door is hot during operation.
Lennox Hearth Products, its employees, or any of its
representatives assume no responsibility for any dam-
ages caused by an inoperable, inadequate, or unsafe
condition as a result of any improper operation, service
or installation procedures, whether direct or indirect.
INSTALLER: THESE INSTRUCTIONS ARE TO REMAIN
WITH THE HOME OWNER!
Cautions & safety

4
Codes & Approvals
CertifiCation
Gas appliances must be tested and certified by a nation-
ally recognized testing and certification laboratory to ANSI
(American National Standard Institute) gas appliance safety
standards.
This insert has been tested and certified by OMNI -Test
Laboratories to ANSIZ21.88-2005/CSA 2.33-2005 Standard
for Vented Gas Fireplace Heater and CGA 2.17-M91 and UL
307B Gas Burning Heating Appliances for Manufactured
(Mobile) Homes.
It has met all necessary ANSI Standards and is fully certified
for installation in any community. If there are any questions
or if you need further substantiation either write to or call
your Lennox Hearth Products dealer. If you have further
questions, please contact Lennox Hearth Products.
Commonwealth ofmassaChusetts requirements
Installation of these fireplaces are approved for installation
in the US state of Massachusetts if the following additional
requirements are met -
• Installation and repair must be done by a plumber or gas
fitter licensed in the Commonwealth of Massachusetts.
• The flexible gas line connector used shall not exceed 36
inches (92 centimeters) in length.
• The individual manual shut-off must be a T-handle type
valve.
Orifice Size/Altitude Adjustment
For altitudes above 2,000 feet (In Canada 4,500 FT/1370
M),the orifice should be de-rated by 4% for every 1,000 feet
to maintain the proper ratio of gas to air. Improper orifice
sizing may result in damage and unsafe conditions. Chang-
ing the orifice should only be done by a qualified service
technician. Contact your Lennox Hearth Products dealer for
proper orifice sizes. (see Page 15 for more information)
The Designer™ Insert
• Must conform with all local, state, and national installation
codes. In the absence of local codes, the installation must
conform with National Fuel Gas Code ANSI Z223.1 - latest
edition, also known as NFPA 54 (In Canada, the current
CAN/CSA B149.1 installation code). Refer to the National
Fuel Gas Code and local zoning and code authorities for
details on installation requirements.
• Must conform with the Manufactured Home Construction
and Safety Standard, Title 24 CFR, Part 3280 (in Canada
CAN/CSA Z240 MH), or when such a standard is not
applicable, the Standard for Manufactured Home Instal-
lations, ANSI A225.1 - latest edition for manufactured
(mobile) home installations.
• Must be vented directly to the outside in accordance with
the latest edition of the National Fuel Gas Code and must
never be attached to a chimney serving a separate solid
fuel burning appliance.
• Uses room air for combustion. It is imperative that
provisions for adequate combustion and ventilation air
be made. This appliance is NOT designed to and will not
operate in a negative pressure. Contact your dealer if you
suspect such a situation exists.
• Has been certified for use with either natural gas or pro-
pane.
• Is not for use with solid fuels.
• Is approved for sitting rooms and/or bedrooms.
Fireplace Requirements
These heaters are designed to be installed into an existing
masonry fireplace (built to UBC 37 or ULC S628 standards)
or factory built solid fuel, wood burning fireplace (listed to
UL 127 or ULC S610) only. All exhaust gases must be vented
outside the structure. Combustion air is drawn from outside
the structure. When installing in a factory built fireplace, the
fireplace grate must be removed and the damper must be
removed or secured open.
If the factory-built fireplace has no gas access hole(s)
provided, an access hole of 1-1/2 inches (38 mm) or less
may be drilled through the lower sides or bottom of the
firebox in a proper workmanship like manner. This access
hole must be plugged with a non-combustible insulation
after the gas supply line has been installed. The installer
must mechanically attach the marking supplied with the gas
fireplace insert to the inside of the firebox of the fireplace
into which the gas fireplace insert is installed.
IMPORTANT: When installing these appliances into a fac-
tory built fireplace or heat-form, the air flow within and
aroundthefireplace shallnot be alteredby the installation
of the insert (i.e. DO NOT BLOCK louvers or cooling air
inlet or outlet ports, circulating air chambers in a steel
fireplace liner or metal heat circulator).
WARNING
THIS FIREPLACE HAS BEEN ALTERED TO
ACCOMMODATE A FIREPLACE INSERT AND
SHOULD BE INSPECTED BY A QUALIFIED
PERSON PRIOR TO RE-USE AS A
CONVENTIONAL FIREPLACE.

5
Pre-Installation
features
Installation Options
Residential - Vented Vertical Only
Manufactured (Mobile) Home
Natural Gas Or Propane (LP)
Bedrooms
Optional Wall-mounted Or Remote Thermostat
Electrical
The fan motor requires 120 Volts AC for operation. The
fireplace is not dependent on the fan or an outside electrical
supply to operate.
Millivolt Valve
This insert is operated with a millivolt valve and therefore
burns even during a power outage.
Fuel
This insert comes from the factory equipped to burn natural
gas at a specified elevation. The insert can be converted
to burn LP (liquid propane) by installing a conversion kit.
Only Lennox Hearth Products conversion kits can be used
to convert from NG to LP or LP to NG. Contact your Lennox
Hearth Products dealer for details.
paCkaging list
To install a Designer insert, an insert body, face, surround
(flange) kit, and brick panel are required.
Insert Body Packaging List
1 Insert Body with Burner Cassette
1 Set of Refractory Brick Panels - Left and Right Sides
1 Log Set
1 Bag of Embers
1 Fasteners: 6 slotted 1/4" truss screws
6 speed nuts
9 spring clips
3 plastic adhesive wire restraints
1 Installation and Operation Manual
Decorative Faces - One Required
Arch Inset
Classic
Screen
Foundry
Cast Pillar
Surround Kits - One Required
Traditional 1-pc. (41"W x 29"H)
Traditional 3-pc (29"W x 41"H, 29"W x 48"H, 33"W x
41"H, or 33"W x 48"H)
Cast Iron (45-1/2"W x 30"H-Cast Pillar face only)
Surround Kit Contents
1 Top Surround
2 Side Surrounds
3 Gold Colored Trim Pieces
2 Elbowed Trim Fasteners
RATINGS Designer™ (DBV)
NATURAL GAS LP GAS
MAX/MIN INPUT BTUH 0-2,000 FT (0-610 M) u
30,000/20,500 28,500/17,100
MANIFOLD PRESSURE (IN. WC)
3.5 10.0
MIN. INLET PRESSURE (IN. WC)
5.0 10.5
MAXIMUM HEAT OUTPUT BTUS/ HOUR “STEADY STATE” 25,600 24,800
P4 Efficiency v
55.63% 57.89%
ORIFICE (DMS) 0-2,000 FT (0-610 M) u
#37 #52
uUnit factory equipped for 0-2000 FT/0-610 M, In Canada 0-4500 FT/0-1370 M
vTested to CSA P.4.1-02 “Testing Method for Measuring Annual Fireplace Efficiency.
Electrical Rating: 120 VAC, 60 HZ, Less Than 2 Amps

6NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 2
minimum fireplaCe opening required
A = 29-3/4” (756mm) Front Opening
B = 19-1/2” (495mm) Height
C = 19” (483mm) Rear Width
D = 15-5” (394mm) Fireplace Depth
* Top air duct will need to be removed for short ZC applica-
tions. Replace tap tights when removed.
minimum fireplaCe Cavity
Insert Dimensions
Width of insert behind Surround Panels 28" (711mm)
Rear height 18-1/2" (470mm)
Insert depth into fireplace 15-3/8" (391mm)
Flue center line from back of surround with
standard draft hood
12" (305mm)
Flue center line from back of surround with
extended draft hood
16"(406mm)
Flue collar diameter (OD) 3-15/16"
(100mm)
A
B
C
D
CAUTIONS
•The fireplace in which this gas insert is to be
installed must be thoroughly cleaned if it has
been used to burn wood or synthetic logs. Have
the chimney and all inside surfaces of the fire-
place brushed and vacuumed so that no soot,
embers, or loose combustion deposits can be
drawnintotheheatcirculation blowerandblown
into the living area.
•Ifanyportionofthechimneysystemshowssigns
of structural or mechanical weaknesses, such
as: cracks, leaky joints, corroded or warped
surfaces, the faulty portion must be repaired
or replaced prior to installing this appliance.
•The factory built firebox must accept the insert
withoutmodificationotherthanremovingbolted
or screwed together pieces such as baffles /
smoke shelf / deflectors, ash lips, glass door,
screen or door tracks, log grates, refractory or
masonry lining and damper assemblies. Any
fireplacecomponent,which isremoved,mustbe
retainedsothey canbereinstalled torestorethe
fireplace to its original operating condition. The
removal of any part must not alter the integrity
oftheoutershellofthepre-engineered fireplace
cabinet in any way. Any parts removed must be
replaceable. If any components are removed
from (or altered) from the existing fireplace,
a Warning Label (see Page 4) must be affixed
inside the fireplace firebox, so that it shall be
visibleuponremovalofthefireplaceinsert. Note:
RTV high temperature silicone is an approved
adhesive to affix the label.
insert dimensions
Figure 1
Figure 3
Top View
4"
(102mm)
15-3/8"
(391mm)
Side View
20-1/8" (511mm)
16-1/4" (413mm)
4-1/2" (114mm)
10" (254mm)
28" (711mm)
12" (305mm)
20-1/8"
(511mm)
18-1/2"
(470mm)
19-1/2"
(495mm)

7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Note: Hearth protection to be min. 3/8” (10mm) thick non-
combustible or equivalent, with a k factor of .84.
insert leveling
At each front and rear corner of the insert is an adjustable leg
provided to level the insert should the hearth of the fireplace
be uneven. To adjust the legs, loosen the two 5/32" allen head
screws, move the leg to the desired height, and then tighten
the screws. Repeat these steps for each adjusting leg.
E
H
F
G
J
C
L
MANTEL
TRIM
Mantel
Trim
Hearth / Floor Protection
E & J = 32.0” (813mm) from Top Facing or Mantel to Bot-
tom of Insert
F 52. = 10.5” (267mm) from Edge of Glass to Side Facing
or Side Wall
hearth proteCtion
G = Minimum Hearth Protection from Front of Insert*
H = Vertical Distance from Insert Bottom to Combustible
Material.
Clearances to Combustibles
minimum ClearanCes to Combustibles
ClearanCes
G 13”(330mm) 10”(254mm) 0”(0mm)
H 0”(0mm) 2”(21mm) 4”(102mm)
Figure 4

8NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Installation
insert venting
WARNING: This appliance is equipped with a safety control sys-
tem designed to protect against improper venting of combustion
products. Operation of this heater when not connected to a prop-
erly installed and maintained venting system or tampering with
the blocked vent shut-off system can result in carbon monoxide
(CO) poisoning and possible death.
Insert must be vented to the outside in accordance with the current
edition of the National Fuel Gas Code ANSI-Z223.1-latest edition,
also known as NFPA 54 (In Canada, the current CAN/CSA
B149.1 installation code). The insert must not be connected to
a chimney flue serving a separate solid fuel burning appliance.
This gas insert requires a 4” diameter B-vent or listed flex alumi-
num or stainless chimney liner extending the entire length of the
chimney to ensure proper operation. The vent should terminate
with a chimney cap or rain cap.
Chimney should be sealed around
cap to prevent air and rain from
entering chimney. Adhere to vent
manufacturer's instructions for
installation and vent termination.
The insert must be installed so
the draft hood is in the same
atmospheric pressure zone as
the combustion air inlet to the
appliance.
flue Collar ConneCtion
This insert has a detachable flue
collar to ease installation. To de-
tach flue collar, unscrew the draft
tube retaining screw and slide draft
tube and flue collar to the rear. At-
tach flue collar (with 3 sheet metal
screws or a B-vent connector) to
vent pipe previously installed in chimney. As the insert is pushed
into fireplace, guide draft tube and flue collar into the guide
brackets until draft tube retaining screw can be reinstalled in its
original hole.
extended draft hood
To aid in installing the Designer™ gas insert, an optional extended
draft hood is available. When installed, the extended draft hood
moves the flue collar four inches farther to the rear.
Figure 5
Draft Tube
Retaining
Screw
Chimney Cap
Storm Collar
Opened Flue
Damper
Figure 6
Chimney - Use With
B-vent Chimney Or
Single Wall Gas Vent
Flex Chimney Liner
Listed To UL 1777 Or
ULC S635.
WARNING
Do not substitute the heat-rated flex liner (UL1777 or ULC
S635) for the exhaust with any other type liner or a fire
may result causing property damage, personal injury or
loss of life.
VENT KITS
Cat. # Model Description
H0906 VKBVI25 BVI, 4" Dia. x 25’ Length
H0907 VKBVI35 BVI, 4" Dia. x 35’ Length
Figure 7

9
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
zero ClearanCe fireplaCe installation
This insert may be installed in a masonry or factory built /
zero clearance (ZC) fireplace.When installing in a ZC fireplace
the ZC grate must be removed and the ZC damper must be
removed or secured open. The ZC doors, screen, refractory
or masonry lining, baffles, and smoke shelf may be removed
if necessary to install the gas insert. However, do not cut
or alter the fireplace components. The removal of any
parts to facilitate installation must not alter the integrity of
the inner or outer shells of the fireplace cabinet. Any parts
removed must be replaceable if the insert is taken out of
the fireplace or the fireplace clearly marked with a paint
stick that "This fireplace has been altered and is no longer
safe to operate."
The insert is designed to fit into a ZC fireplace with a mini-
mum firebox height of 19-1/2 inches (495mm). To facilitate
this installation the flue collar is removable (See "Flue Collar
Connection").
glass door removal
See page 19 for Glass Door Removal Instructions.
briCk liner installation
The brick panels are extremely fragile so handle them with
care.
1. Remove the panels from their packing material.
2. The long rectangular panel goes in the rear of the firebox
- the thin layer of bricks should be down. The brick panel
rests on the air control panel. The rear brick panel is held
in place by the side panels.
3. The rounded edge of the side panels goes to the front.
Install the side panels by sliding them along the side of the
firebox. They are held in place by two screws protruding
from the top of the firebox.
log set & ember installation
Caution: If the logs are not properly installed, your insert
will not function properly.
Parts list: rear log, left front log, right front log, left top
log, right top log, and small straight twig
1) Remove the logs from the box and carefully unwrap them.
The logs are fragile so handle them with care.
2) At the rear of the firebox is a log retainer (the circled
area in Figure 10). This retainer can be rotated forward
to increase the size of the flames in front of the rear log.
Rotate the retainer by loosening screw A. For inserts
burning propane the retainer may be rotated half the way
forward. For inserts burning natural gas, the retainer may
be rotated all the way forward. It may be necessary to try
various setting to find the optimum one. Never rotate the
retainer to such an extent as to cause sooting.
3) Align the holes in the bottom of the rear log (the longest
log in the set) with the two pegs just to the rear of the
rear burner tube and slide the log down onto the pegs.
See Figure 10. The charred black surface of the log should
face the front. (Continued on the following page).
A
Figure 9 Figure 10

10 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Right Top Log
Left Top
Log
Hole to
Cover
Hole to
Cover
Flat Area
Embers
4) Rotate the right front log (3018 is cast into its bottom
surface) so the black charred surface is toward the front.
Place this log so the two holes in its bottom surface slide
onto the two pegs on the right side of the air control
panel. See Figure 11.
5) Rotate the left front log (3017 is cast into its bottom
surface) so the black charred surface is toward the front
and place it on the pegs protruding from the left side of
the air control panel as shown in Figure 11.
6) The small straight top twig (3021) should be turned so
the black flat end is turned to the rear. Slide the holes in
the bottom of this twig over the right peg on the left front
log and the hole on the right front log. See Figure 12.
7) The left top log (3019) should be positioned as shown
in Figure 12. Slide the holes in the bottom of this log
over the hole in the left end of the rear log and the peg in
the left end of the left front log. The right top log (3020)
should be positioned as shown in Figure 12. Slide the
holes in the bottom of this log over the peg in the right
end of the right front log and rest it on the flat spot on
the rear log.
8) Figure 13 shows the entire log set assembled. The embers
provided may be placed one high in front of the front
burner tube using care not to cover all the burner ports.
Any extra embers may be placed at the ends of the front
log, off the burner. Place small pinches of rockwool on
top of the embers.
Note: The pilot flame can be viewed
through this hole in the front log.
Figure 11
Figure 12
Figure 13

11
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
surround panels installation
The Designer™ insert surround panels are made of heavy gage
steel for durability and, if desired, for the ease of making an inside
fit in the fireplace. See "Packaging List" for sizes available.
1. Remove the speed nuts from the parts bag and install (with the
flat surface forward) on the six holes in the surround brackets,
three on each side of the insert (See A in Figure 14). A flat
bladed screwdriver may help in installing the nuts.
2. Install all surround panels and trim with the insert positioned
in the fireplace but a few inches in front of its final location.
3. If the insert face is to be installed on the insert, the sight
obstructor that comes with the face must be installed prior
to installing the surround panels. With the curved edge down
and the bent top edge positioned toward the insert, slide the
tabs at the ends of the obstructor in the slots on the surround
brackets (see C in Figure 14).
4. Install the side surround panels by lining up the holes in the
tabs on the side surround panels in front of the holes on the
surround brackets. Next insert two slotted 1/4" truss screws
for each side surround panel and secure loosely.
5. Fasten top surround panel with the remaining two truss screws.
Tighten all six truss screws after adjusting the surround panels
to eliminate space between side and top surround panels.
6. Assemble the surround trim by inserting the elbowed retainer in
the rectangular slot in the ends of the longest piece of trim and
secure by tightening the screw in the retainer. Slide the mitred
ends of the two side trim pieces onto the elbowed retainer and
secure by tightening the retainer screw.
7. The fastened trim pieces should now be horseshoe shaped.
Slide the trim down over the surround panels so the edge of
the surround panel fits just behind the rounded edge of the
trim.
8. Install three spring clips (found in parts bag in firebox) in each
piece of trim by inserting them between the rear of the surround
and the channel of the trim. The spring clips will push the trim
tight to the surround.
faCe installation and Cleaning
A number of different face finishes and shapes are avail-
able for your Designer™ Flush Gas Insert. The insert Face
comes with a sight obstructor that must be installed prior
to installing the surround panels (see step 3 on Page 11)
and face. The faces come with hooked brackets. To install
the face, hang the hooked bracket on the surround brackets
(D in Figure 14).
NOTE: GOLD PLATED SURFACE MUST BE CLEANED
WITH GLASS CLEANER AND SOFT RAG BEFORE FIRING
THE FIRST TIME OR FINGER PRINTS AND STAINS WILL
REMAIN PERMANENTLY. NEVER USE BRASS POLISH TO
CLEAN GOLD, THIS WILL REMOVE GOLD PLATING!
ORIFICE SIZE/ALTITUDE ADJUSTMENT
See instructions on page 4
A
B
C
Figure 14

12 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 16
Gas Line Installation
After leveling, position the insert in the fireplace, holding it about
six inches out from its final location.
Caution: Specific Hearth Requirements apply (see Clearances
and Specifications). The Designer™ gas insert must be con-
nected to the gas line in accordance with local codes and / or
the National Fuel Gas Code--- Z223.1-latest edition, also known
as NFPA 54 (In Canada, the current CAN/CSA B149.1 installa-
tion code). Included in the manual package is a 8" gas nipple.
Locate the threaded gas inlet on the lower left of the insert.
Thread the 8" gas nipple into the inlet with a teflon sealer or
equiv. Attach the gas supply line to this hard pipe. The hard
pipe can receive a 3/8” inch female iron pipe coupling, or a shut
off valve. After connecting the gas line, all joints in the line and
connections at the valve should be checked for leaks.
gas pressure requirements
A MAJOR CAUSE OF OPERATING PROBLEMS WITH GAS
APPLIANCES IS IMPROPER GAS PRESSURE!
The most important item to check during the initial
installation and the first thing to check when operating
problems occur is gas pressure! This appliance will
not function properly unless the required gas pressure
is supplied. See the table on this page for gas pressure
requirements.
Two pressure taps are provided on the insert's valve to check gas
pressures. The taps are located to the right of the on/off/pilot knob
(see Figure 15). The bottom tap is the inlet (supply) pressure side.
To check inlet pressure (with the insert burning), insert a small
phillips screw driver into the tap and turn a half turn counter-
clockwise. Cover the tap with the line from a manometer and check
the pressure. Close tap gently but securely after completing the
check. The manifold (outlet) tap is above the inlet tap. To check
manifold pressure (with the insert burning at the high burn setting)
insert a small phillips screw driver into the tap and turn a half turn
counter-clockwise. Cover the tap with the line from the manometer
and check the pressure. Again close the tap gently but securely
after completing the check. Check the taps for gas leaks with a
gas leak test solution (retighten if necessary).
If the pressure is not sufficient, make sure the gas supply line
is large enough, the supply regulator is properly adjusted, and
the total gas load for the residence does not exceed the amount
supplied.
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 test pressures in excess of
1/2 psig.
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. Check with your gas
supplier or plumber.
Gas Supply Line Sizing
The proper gas line diameter must be selected to run from the
supply regulator to the insert. Refer to the following table for
proper gas pipe diameters.
NOTE: Some areas allow copper tubing - check with local approval
agencies and codes.
COPPER TUBING NOT ALLOWED IN MASSACHUSETTS IN
NATURAL GAS INSTALLATIONS, NEVER USE GALVANIZED OR
PLASTIC PIPES.
Fuel
Type
Inlet Pressure Manifold Pressure
Desired Minimum Maximum On Hi
Fire
On Lo
Fire
Natural
Gas
7" WC 5" WC 10.5" WC 3.5" WC 1.7" WC
LP Gas 11" WC 10.5" WC 13" WC 10.0" WC 5.4” WC
12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
1
/ 2 "
(1.3 cm)
7
/ 8 "
(2.3 cm)
3
/ 4 "
(2.0 cm)
3
/ 4 "
(2.0 cm)
150-200
3
/ 4 "
(2.0 cm)
100-150
1
/ 2 "
(1.3 cm)
7
/ 8 "
(2.3 cm)
3
/ 4 "
(2.0 cm)
1
/ 2 "
(1.3 cm)
3
/ 4 "
(2.0 cm)
1
/ 2 "
(1.3 cm)
1
/ 2 "
(1.3 cm)
40-100
1
/ 2 "
(1.3 cm)
5
/ 8 "
(1.6 cm)
1
/ 2 "
(1.3 cm)
10-40
3
/ 8 "
(1.0 cm)
1
/ 2 "
(1.3 cm)
3
/ 8 "
(1.0 cm)
1
/ 2 "
(1.3 cm)
0-10
Natural Gas Natural Gas L.P.L.P.
Pipe Length
(Feet from Supply
Regulator)
(Do Not Use Copper in Massachusetts
with Natural Gas)
Tubing, Type L Outside Diam-
eter (Copper)
Schedule 40 Pipe
Inside Diameter
(Black Pipe)
1
/ 2 "
(1.3 cm)
Gas Line Installation
After leveling, position the insert in the fireplace --- holding it
about six inches out from its final location.
Caution: Specific Hearth Requirements apply (see Clearances
and Specifications). The Designer™ must be connected to the
gas line in accordance with local codes and / or the National Fuel
Gas Code--- Z223.1-latest edition, also known as NFPA 54
(In Canada, the current CAN/CSA B149.1 installation code).
Included in the manual package is a 8" gas nipple. Locate the
threaded gas inlet on the lower left of the insert. Thread the
8" gas nipple into the inlet with a teflon sealer or equiv. Attach
the gas supply line to this hard pipe. The hard pipe can receive
a 3/8” inch female iron pipe coupling, or a shut off valve. After
connecting the gas line, all joints in the line and connections
at the valve should be checked for leaks.
G as s upply l ine s izinG
The proper gas line diameter must be selected to run from the
supply regulator to the stove. Refer to the following table for
proper gas pipe diameters.
NOTE: Some areas allow copper tubing - check with local approval
agencies and codes.
COPPER TUBING NOT ALLOWED IN MASSACHUSETTS IN
NATURAL GAS INSTALLATIONS, NEVER USE GALVANIZED OR
PLASTIC PIPES.
Robertshaw Millivolt Gas Valve
TP/TH
TH
TP
Inlet (Supply)
Pressure Tap
Figure 15
The Manifold
(Outlet) Tap

13
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 17
propane (lp) and natural gas supplies
Your Designer™ gas insert is equipped from the factory for
use with natural gas only as specified on the Safety / Listing
label attached to the appliance. This appliance can only be
operated using propane gas (LP) if a certified fuel conver-
sion kit provided by Lennox Hearth Products is installed by
a qualified service technician.
Also check the orifice size on the label on the igniter bracket.
It must be the correct size for the fuel and altitude.
Do not run propane tank dry. Running the tank dry may
cause a hazardous condition due to pressure drop in
empty tank.
Solid fuel is NOT to be used with this unit.
air shutter adjustment
The Designer gas insert has an air shutter control lever
located behind the lower door on the insert's face and to
the left of the gas valve. See Figure 17. The lever is linked to
the primary air shutter on the main burner. The air shutter
regulates the amount of primary air the burner receives and
therefore how clean the insert burns. The air shutter should
only be adjusted by a qualified gas technician. The insert
should burn for about 15 minutes with the logs installed
before adjusting the air shutter. Pulling the lever out will
open the shutter and turn the flames more transparent and
blue. Pushing the lever in will close the shutter and turn the
flames more orange.
Caution: The air shutter should never be set so as to
make the tips of the flames sooty or create sooting on
the viewing glass, logs, or heat exchanger. If soot begins
to form after burning, the air shutter should be opened
gradually until the sooting condition stops. Gas quality
and gas pressure may vary, which can affect the burning
characteristics of the insert.
Air Shutter
Adjuster

14
Operating Instructions
pre-lighting CheCklist
Be sure to check these items before the initial lighting of
the insert:
- All packaging materials are removed from the firebox;
brick panels and logs are installed.
- The insert gas label must correspond to the gas supply
available---that is “natural gas” for natural gas; "LP gas"
for LP gas.
- Be sure the gas pressure has been carefully checked (see
Gas Pressure Requirements).
- Fingerprints or other marks are cleaned (while the insert
is cool) from any gold or nickel surfaces with denatured
alcohol and a soft cloth. Marks left on these surfaces
may become etched into the finish if not removed prior
to burning the unit.
- Check all gas fittings for leaks.
- Remove all combustible materials from the area in front
of the insert and ensure the vented areas of the insert face
are unobstructed.
- Check to ensure all clearances to combustibles are met-
see page 7.
- Make sure the glass door is in place and properly sealed
before burning the appliance
- Ventilate the house to clear initial paint curing odors---see
page 16.
Lighting Instructions
The following is a copy of the operating and lighting instruc-
tions found with each insert:
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS
EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING
PROPERTY DAMAGE, INJURY, OR LOSS OF LIFE.
CAUTION: HOT WHILE IN OPERATION. DO NOT TOUCH. KEEP
CHILDREN, FURNITURE, GASOLINE, AND OTHER LIQUIDS
WITH FLAMMABLE VAPORS AWAY. NEVER OPERATE UNIT
WITH GLASS OFF OR ATTEMPT TO REMOVE THE GLASS
WHILE HOT.
A. This appliance is equipped with a piezo ignition device
to light the pilot. When lighting the pilot, follow these
instructions exactly.
B. BEFORE LIGHTING, smell around the appliance area for
gas. Be sure to smell next to the floor, because some gas
is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
DO NOT try to light the appliance.
DO NOT touch any electric switch,
DO NOT use any phone in the building. Immediately call
your gas supplier from a neighbor's phone. Follow the gas
supplier'sinstructions.Ifyou cannotreach yourgas supplier,
call the fire department.
C. Use only your hand to push in or turn the gas control
knob. Never use any tool. If the knob will not push in or
turn by hand, don't try to repair it, call a qualified service
technician. Force or attempted repair may result in a fire
or explosion.
D.
DONOTusethisapplianceifanyparthasbeenunderwater.
Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system
and any gas control which has been under water.
OPERATING INSTRUCTIONS
CAUTION: Your Lennox™ gas INSERT MUST ALWAYS BE
OPERATED WITH GLASS IN PLACE.
STOP!! Read the safety information above before pro-
ceeding.
1. Open the lower door. Make sure gas supply shut-off cocks
are open and ON/OFF rocker switch is "OFF." If equipped
with a thermostat, set it to the lowest setting.
2. Turn off all electrical power to the appliance.
3. Push in gas cock dial slightly and turn clockwise to
"OFF."
NOTE: Dial cannot be turned from "PILOT" to "OFF" unless
dial is pushed in slightly. Do not force.
4. Wait five minutes to clear out any gas. Then smell for gas,
including near the floor. If you smell gas, STOP! Follow
"B" above. If you don't smell gas continue.
5. Locate the pilot by looking over the top of the left front
log. A blue flame will be seen when the pilot is lit.
6. Turn the gas control knob counter-clockwise to
the "PILOT" position.
7. Push the knob all the way in and hold in that position.
Immediately light the pilot by pressing the igniter button
several times until pilot is lit. Continue to hold the knob
in for about 30 seconds after the pilot is lit. Realease
knob and it will pop back out. Pilot should remain lit. If it
goes out, repeat steps 4-8 holding knob in an additional
15 seconds after pilot is lit. If knob does not pop out
when released, stop and immediately call your service
technician or gas supplier. If the pilot will not stay lit after
several tries, turn the gas control knob to "OFF" and call
your service technician or your gas supplier.
8. After pilot is lit, turn gas control knob counter-clockwise
to "ON." Knob can only be turned to "ON" if the
knob has popped out.
9. To turn burner on, turn "ON/OFF" rocker switch to "ON"
or set the thermostat to the desired temperature above
room temperature.
10. Adjust the flame height (and heat output) by turning the
flame height knob clockwise for full flame and
counter-clockwise for reduced flame.
11. Turn on the electric power to the appliance and set the
blower to the desired air flow after it turns on when the
appliance reaches operating temperature.

15
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Thermopile Igniter
Gas Pilot Hood
Millivolt Pilot
TO TURN OFF GAS TO APPLIANCE
1. Turn off the "ON/OFF" rocker switch and/or thermostat (if
installed) to its lowest setting.
2. Turn off electric power to the appliance if service is to
be performed.
3. Push in gas control knob slightly and turn clockwise
to "OFF." Do not force.
This appliance needs fresh air for safe operation and must
be installed so there are provisions for adequate combus-
tion and ventilation air.
WARNING: Improper installation, adjustment, alteration,
service, ormaintenancecan cause injury orpropertydam-
age. For assistance or additional information, consult a
qualified installer, service agency, or your gas supplier.
Operation of this appliance when not connected to a prop-
erly installed and maintained venting system can result in
carbon monoxide (CO) poisoning and possible death.
SHUTDOWN PROCEDURE
To turn off the burner, turn the rocker switch to "OFF" or
adjust the thermostat (if installed) to a setting below room
temperature. The pilot will remain lit for future burner igni-
tion. For complete shutdown, see "TO TURN OFF GAS TO
APPLIANCE" above.
Flame Color & Behavior
Your Designer™ gas insert is designed for maximum heat-
ing efficiency. Therefore, upon lighting of the main burner
the flames will be semi-transparent or “bluish.” After 10-20
minutes of operation the logs will heat up and the flames
will become a yellow/orange color.
Adjustingthe inserttocausethe flamestoturn orangesooner
may result in poor combustion, sooting, and a hazardous
situation. See the drawing to the right showing proper flame
appearance.
Robertshaw Millivolt Gas Valve
TP/TH
TH
TP
GasControlKnob
(Pilot/On/Off)
OFF
ON
PiezoIgniter
Allumeur ON/OFF Switch
Interrupteur
FlameHeightControl
Knob(HI/LO)
No Blue Flame
Center
Soot at
Flame Tip
Dark Orange
Flame
IMPROPERLY
BURNING FLAME
Soot above
Flame Tip No Soot at
Flame Tip
PROPERLY
BURNING FLAME
Semi-Transparent
Yellow Flame
Blue Flame
Center
Ports on Pan
Burner Assembly
Burner Flame Appearance
Control Panel
Figure 18
Figure 19
OFF / PILOT / ON
Gas Control
HI / LO
Flame Height Control
replaCing burner orifiCes
This insert has two separate burner tubes and therefore an
orifice for each. The front and rear orifices have different
thread types so that a front orifice cannot be installed in the
rear orifice location and visa-versa. Installing them in the
wrong location will destroy the orifice threads.
To change orifices, first remove the cassette (see Fuel Con-
version and Cassette Installation). Then remove the burner
retaining plate by removing the allen head screw C (see
Figure 9). This allows the front and rear burner tubes to be
removed providing access to the two orifices.
The rear orifice has 9/16-24 threads and can be removed by
unscrewing the 5/8 compression nut and then unscrewing
the 3/4" jam nut from the orifice. The front orifice is a 3/8"
NPT and can be unscrewed with a 3/4" wrench.
REDUCING THE ORIFICE SIZE FOR HIGHER ALTITUDES
MAINTAINS THE PROPER BTU INPUT TO AIR RATIO. TOO
LARGE AN ORIFICE WILL RESULT IN HIGHER BTU INPUTS
THAN THE DESIGN ALLOWS, MAY RESULT IN AN UNSAFE
CONDITION AND MAY VOID YOUR WARRANTY.
For altitudes above 2,000 ft. (610M) (In Canada 4,500
FT/1370 M) the appliance should be derated by four (4%)
percent every 1,000 ft. (305M).
To operate safely, your Designer™ gas insert must have
the proper burner orifice size determined by the altitude at
which it will be operated and other variables such as pres-
sure and valve tolerances. If you have reason to believe
your insert’s orifice size may be incorrect for your altitude,
have it checked and remedied (if necessary) by a qualified
service technician.

16 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
paint Curing
This insert has been painted with Stovebright high tem-
perature metallic stove paint. It leaves the factory dry to
the touch, but finishes curing as the insert is used. Fire the
insert four successive times for ten minutes each time with
a five minute cool down between each firing. Ventilate the
house during these first firings as the paint gives off car-
bon dioxide and unpleasant odors. It is recommended that
persons sensitive to an imbalance in the indoor air quality
avoid the insert during the curing process.
Quiet Operation
GAS NOISE: The sound of gas flowing through the insert
may be detectable while the unit is in operation. This is a
normal operating sound, however if it is objectionable, it
can be reduced by turning down the flame. Turning down
the flame will reduce heat output.
BLOWER NOISE: As the insert heats up, the blower will come
on to move hot air through the heat exchanger and into the
room. Adjust the fan speed with the fan control knob to the
sound level and air flow desired.
blower
Your Designer gas insert comes equipped with a 150 CFM
blower with a variable speed control and an automatic
temperature activated On / Off snap switch.
Operation:
1. Plug the blower power cord into a grounded (three
prong) outlet. This appliance is equipped with a three
prong (grounding) plug for your protection against
shock hazard and should be plugged directly into a
properly grounded three - prong receptacle. Do not cut
or remove the grounding prong from this plug.
2. After the insert warms up, the fan will come on if the
speed control (located at the far right below the firebox)
is left in the on position. The fan will not operate until
the insert is warm.
3. Once the fan comes on, turn the knob to the desired
speed. No further adjustment is necessary, the fan will
come on automatically whenever the insert is warm.
4. If you do not wish to have the fan on, turn the knob until
it clicks into the OFF position.
“On-Off” Switch And Thermostat
Your gas insert comes with an “ON/OFF” rocker switch
used to turn the burner on and off while the pilot is on. The
rocker switch can be installed in the hole in the right side
of the top surround panel or in the hole in the panel to the
left of the igniter button. The hole in the panel is covered by
a label which must be carefully cut out before installing the
rocker switch. The switch must be disconnected from the
coil of wire to which it is attached, the plastic nut unscrewed
from the back side of the switch, and then the switch can
be inserted into the hole at either location. If the switch is
to be located in the surround, route the wire behind the
igniter bracket and through the hole in the lower right side
of the insert. Attach the three plastic adhesive wire restraints
(found in the bag in the firebox) to the side surround panel.
Feed the wire through these restraints and up to the switch.
Care should be taken to ensure the wire does not come in
contact with the hot surfaces of the firebox. Reconnect the
wires to the switch.
A wall thermostat or remote thermostat can be used to
supplement the rocker switch. The thermostat and rocker
switch will turn the burner on and off independently. Be
sure to set the rocker switch to the “Off” position when
using the thermostat and set the thermostat to the lowest
temperature when you wish to use the rocker switch only,
otherwise one may override the other. If a remote thermo-
stat is to be used with the insert, do not place the receiver
under the firebox.
pilot adjustment
All pilots are burned and checked at the factory prior to
shipment. (NOTE: If upon initial insert installation the pilot
flame flickers or will not remain lit, most likely the pilot is
fine but there is air in the gas line or the gas pressure is too
low). Pilot adjustment is not normally required, but should
it be necessary, it should be done only by a qualified service
technician. The pilot adjustment screw is located below the
ON/OFF/PILOT control knob. With a flat bladed screw driver,
remove the pilot adjusting cover to access the pilot adjust-
ing screw. Adjust pilot screw to the properly sized flame.
The flames should completely surround the thermopile and
extend across the main burner tube ports. Be careful not
to back the adjusting screw out of its threads. Replace the
cover and check for gas leaks.
Figure 20

17
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
millivolt Control system
This insert operates on a millivolt control system. As such, no
addition power supply is needed for the insert to operate. The
pilot assembly contains a Thermopile, that when heated by the
pilot flame, generates electricity (millivolts, mV=1/1000 of a volt)
that travels to terminal #1. From this terminal it travels through
a black wire to the Vent Safety Snap Switch. If this switch over-
heats through a flue blockage or vent pipe disconnection it will
open, stop the flow of mV and shut the insert off. This switch will
automatically reset (close), when it is cooled down to normal
operating temperature. During normal operation, it is closed
allowing the mV to flow back to the valve, which opens so gas
can flow through.
Thermostat Wire
Wire Size Maximum Length
12 Gage 100 Feet
14 Gage 64 Feet
16 Gage 40 Feet
18 Gage 25 Feet
20 Gage 16 Feet
Do not splice any millivolt wires. Consult the table on this
Page to determine the proper gage of wire for the thermostat
orwallswitchconnections.Thistablereferstothe totallength
of the wire (out to the switch and back). The thermostat
must be a millivolt type. A 24-volt furnace thermostat will
not work. Never hook up household current - 120 Volts - to
the millivolt system. It is not recommended to hook up any
more than two switches to the insert (for example a rocker
switch and a wall thermostat). Additional switches may af-
fect the system resistance and increase the chance of the
burner not igniting. Follow the instructions included with
the thermostat or remote control for wiring.
The thermostat, remote control, and rocker switch will turn
the burner on and off independently. Be sure to set the rocker
switch to the “OFF” position when using the thermostat or
remote control and set the thermostat or remote control to
the lowest temperature when you wish to use the rocker
switch only, otherwise one may override the other. If a re-
mote thermostat is to be used with the insert, do not place
the receiver under the firebox.
PILOT
THERMOPILE
SPARKER
PIEZO IGNITER
VENTSAFETY
SNAP SWITCH
ON/OFF ROCKER SWITCH,
THERMOSTAT, or REMOTE
THERMOSTAT
MANIFOLD PRESSURE TAP
PILOTTUBE
Fig. 15
GAS
INLET
INLETPRESSURETAP
1
3
2
Millivolt Control Schematic
Terminal 3
Valve Terminals
Millivolt and System Checks
Check
Test
To
Test
Connect
Meter
Leads to
Terminals
Thermostat
Connects
Meter
Reading
Should Be
A Complete
System
2 & 3 Closed 100 MV
or More
B Thermopile
Output
1 & 2 Open Greater
Than
325 MV
C System
Resistance
2 & 3 Closed 2.5 Ohms
Figure 21

18 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Maintenance & Servicing
maintenanCe CheCklist
Should Only Be Performed by a Qualified Service Techni-
cian.
Caution: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
1.Annual inspection should be made and the following
checks performed:
a) With unit cool, remove glass and inspect burner for dirt,
soot, and lint accumulations and remove if necessary.
If excessive soot accumulation is present on burner,
have a qualified serviceman adjust burner for proper
combustion.
b) Clean any deposits from inside glass with gas fireplace
glass cleaner. NEVER attempt to remove or clean glass
when the unit is hot.
c) Check the hot air outlet vents to make sure they are
free from lint or other accumulations. Never block or
restrict vent openings or use vents other than Lennox™
products.
d) Check that chimney and its outlet are open and free from
soot, blockage, or debris.
e) Inspect the pilot system for proper flame. See instruc-
tions on page 16.
f) Check the Millivolt system as per the table on page 17.
g) The appliance area must be kept clear and free of com-
bustible materials, gasoline, and other flammable vapors
and liquids.
h) Check glass gaskets once a year. Gaskets must be tight.
Replace if necessary.
2.The viewing glass should be cleaned periodically (see
Glass Maintenance).
Glass Maintenance
Cleaning: When cool, the glass may be cleaned with a clean,
soft cloth and Windex. For cleaning white condensation from
the interior glass, use KEL KEM gas fireplace glass cleaner
available from your insert dealer. Use of caustic or abrasive
cleaners may damage the glass. DO NOT operate the insert
with broken glass. DO NOT clean door or glass when hot. DO
NOT abuse the glass door by striking or slamming it shut.
DO NOT use substitute materials if replacing the glass. DO
NOT spray commercial glass cleaner with ammonia on the
door and glass gasket as it may dissolve the gasket glue.
Replacement: Theglassintheinsertdoorcannotbereplaced
separately. Should the glass be damaged, the entire glass,
gasket, and metal frame assembly must be replaced as a
unit. This replacement glass assembly is available from your
Lennox Hearth Products dealer. The glass is neo-ceramic
and alternative types must not be used.
WARNING: Do not operate appliance with the glass panel
removed, cracked, or broken. Do not remove glass door
while the insert is hot. Replacement of the glass door
should be done by a qualified service technician.

19
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
A
glass door removal
Caution: Do not slam or strike glass door or damage
may occur.
Do not remove the glass door while the insert is hot. To re-
move the glass door, pull forward and up on the top latches.
Lift the glass door up and off the lower spring latch. Be
careful not to damage or scratch the glass while handling.
To reinstall the glass, reverse the removal steps. Do not
operate the insert with the glass removed.
glass door Cleaning and repair
Cleaning: Do not remove or clean the glass door when hot.
A gas door glass cleaner (available from your Lennox Hearth
Products dealer) or windex should be used with a soft cloth
to clean the glass. Do not use an abrasive cleaner.
Repair: If the glass is broken in the glass door, the entire
door (metal frame, gasket, and glass) should be replaced
as a unit. This replacement unit is available from your Len-
nox Hearth Products dealer. Do not use substitute parts or
materials.
Caution: Do not operate this insert with broken glass.
blower removal
Unplug the power supply cord from the electrical outlet prior
to removing the blower. The fan can be accessed through
the back wall of the firebox. Caution: Label all wires prior
to disconnection when servicing controls. Wiring errors
can cause improper and dangerous operation. Verify proper
operation after servicing. See the fan-wiring diagram below
for reference. Remove the insert face, glass door, log set,
and brick panels. All of these items are fragile so handle
them with care. Remove the two allen head screws at the
left and right front of the air control panel and lift the panel
out. Next, remove the nine allen head screws around the
outside of the panel fastened to the back wall of the firebox.
Rotate the top of this panel toward the front, remove the two
wires connected to the fan, and then lift the panel with the
fan attached out of the firebox. To reinstall the fan, repeat
these steps in the reverse order.
eleCtriCal requirements
This gas insert operates without an outside power source,
however the fan/blower requires a 120 Volt electrical service
outlet. The blower must be electrically grounded in accor-
dance with local codes. In the absence of local grounding
codes, the National Electrical Code ANSI/ NFPA 70 - latest
edition. In Canada, the current CSA C22-1 Canadian Elec-
trical Code - latest edition. The blower is equipped with a
three pronged (grounding) plug for your protection against
electrical shock hazard and should only be plugged into a
properly grounded three prong receptacle. DO NOT CUT
OR REMOVE THE GROUNDING PRONG FROM THE PLUG
FOR ANY REASON!
(See Millivolt Control Schematic section for information on
thermostat and On/ Off switch).
Figure 22
Figure 23
Fan Snap Switch
Fan Speed Control
White
Ground (Green)
Black
Blower
Black (Hot)
White (Neutral)
Power Source
Blower Wiring Schematic

20 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
fuel Conversion & Cassette installation
Converting your Designer™ gas insert between natural gas and
LP can be accomplished by either changing the cassette (valve
and pilot assembly) or installing a conversion kit (valve regulator,
burner orifice, and pilot orifice).Only a qualified service technician
should perform the conversion, as it requires disconnecting the
gassupplylineandotherproceduresthatshouldonlybeperformed
by a qualified technician.
Cassette Removal:
1. Be sure the gas supply is off and fan power cord is discon-
nected before beginning the conversion. Disconnect the gas
supply from the insert being careful not to apply pressure to
the valve in the process.
2. Remove the face, glass door, log set, and brick panels (see
related topics).
3. Remove the two allen head screws at the center front of the
firebox securing the air control panel. Lift out the air control
panel.
4. Label and disconnect the black wires from terminals 1 and
3 from the ON/OFF switch and thermostat (if installed) and
the black wire at terminal 1 to the vent safety snap switch.
5. Remove the one allen head screw which holds the burner in
place. Grasp the burner air shutter with your left hand and
the burner with your right hand, then pull the right end of the
burner up and to the right (releasing the air shutter from the
air shutter linkage wire).
6. Disconnect the wire from the back of the piezo igniter (push
button igniter).
7. Remove all six allen head screws (around the perimeter of
the cassette panel) fastening the cassette to the firebox.
8. Grasp the air shutter linkage wire in your left hand and pull
it up as you lift and rotate the rear of the cassette panel up
and through the firebox.
9. Install new, converted, or serviced cassette in the reverse
order of removal. All parts and wires must be correctly rein-
stalled to ensure safe and proper operation of the unit. Check
for gas leaks prior to burning the insert.
Conversion Kit:
Please see instructions provided with conversion kit.