Lennox Hearth Products Medina Merit Series User manual

Report No. 050-S-18b-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.
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 switch; 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 (USA only), 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.
Medina™ (MED)
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
™
US
Direct-Vent Gas
Fireplace Inserts
Retain These Instructions For Future Reference
A French manual is available upon request. Order P/N 775,221CF.
Ce manuel d’installation est disponible en francais, simplement
en faire la demande. Numéro de la pièce 775,221CF.
P/N 775,221M Rev. B, 03/2008
DRAFT
3/11/08(2)

2
Cautions and Safety
FOR YOUR SAFETY do not install or operate your
Medina™ gas insert without first reading and under-
standing this manual. Any installation or operation of
the appliance deviating from that which is stated in this
manual WILL void the warranty and may be hazard-
ous.
INSTALLATIONANDREPAIRSHOULDONLYBEDONEBY
A QUALIFIED SERVICE TECHNICIAN. DO NOT ATTEMPT
TO SERVICE THE APPLIANCE YOURSELF.
The insert should be inspected and cleaned before use
and at least annually by a qualified service technician.
More frequent cleaning may be required due to exces-
sive lint from bedding material, carpeting, etc.
Itisimperativethatcontrolcompartments,burnersand
circulating air passageways of the room heater be kept
clean.
Adequate clearances around the combustion chamber
and accessibility clearances for servicing and 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
and 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, 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. Your Medina 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
and 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.
MobilehomeinstallationsmustconformwiththeMobile
Home Construction and Safety Standard, Title 24 CFR,
Part3280(inCanadaCAN/CSAZ240MH),or, whensuch
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
absence 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.
Do not make any make-shift compromises during
installation. Any modification or alteration may result
in damage to the appliance or dwelling and will void
the warranty, certification and listings of this unit.
Failure to use manufacturer provided parts, variations
in techniques and construction materials or practices
other than those described in this manual may create
a fire hazard and void the limited warranty.
Your Lennox™ gas insert must be equipped for the
proper fuel type and altitude at which it will be oper-
ated. Any operation outside the parameters outlined in
this manual may result in a hazardous condition and
will void the warranty. Please carefully read the sec-
tions pertaining to these subjects and/or be sure your
appliance is properly equipped.
Do not use this insert if any part has been under water.
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.
Due to high temperatures, the insert should be located
out of traffic areas and away from furniture and draper-
ies.
Children and adults should be alerted to the hazards of
highsurfacetemperatureandshouldstayawaytoavoid
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 and nickel plated surfaces must be cleaned with
glasscleanerandacleansoftclothbeforefiring 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!

3
Table of Contents
Cautions and Safety ..................................................................................2
Orifice Size / Altitude Adjustment ..................................................................4
Fireplace Requirements .............................................................................4
Codes and Approvals.................................................................................4
New York City, New York (MEA) .............................................................5
Requirements For The Commonwealth of Massachusetts ..............................5
Pre-Installation........................................................................................6-8
Features.........................................................................................6
Packaging List .................................................................................6
Ratings..........................................................................................6
Insert and Fireplace Dimensions ...........................................................7
Clearances to Combustibles .................................................................8
Insert Leveling .................................................................................8
Installation.............................................................................................9-11
Venting Installation ...........................................................................9
Zero Clearance Fireplace Installation......................................................10
Log Set Installation ...........................................................................10
Surround Panels Installation ................................................................11
Face Installation...............................................................................11
Gas Line Installation .................................................................................12
Gas Pressure Requirements .................................................................12
LP and Natural Gas Supplies ................................................................12
Air Shutter Adjustment...............................................................................12-13
Operating Instructions ...............................................................................13-16
Pre-Lighting Checklist ........................................................................13
Lighting Instructions ..........................................................................13
Flame Color and Behavior ...................................................................15
Paint Curing ....................................................................................15
Quiet Operation ................................................................................15
Blower Operation ..............................................................................15
Optional Wall Thermostat....................................................................15
Operating Options .............................................................................16
Millivolt Control System......................................................................16
Maintenance and Servicing .........................................................................17-18
Maintenance Checklist .......................................................................17
Glass Maintenance............................................................................17
Door Removal..................................................................................18
Fuel Conversion ...............................................................................18
Blower Removal ...............................................................................18
Troubleshooting.......................................................................................19
Replacement Parts ...................................................................................20
Accessories............................................................................................21
Insert Labels...........................................................................................22-23
Product Reference Information .....................................................................24

4NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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.
The Medina™ 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.
• Mobile home installations must conform with the Mobile
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 Mobile Home
Installations, ANSI A225.1 - latest edition.
• 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.
• 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.
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.
IMPORTANT: When installing these appliances into a fac-
tory built fireplace or heat-form, the air flow within and
aroundthefireplaceshall notbealteredby theinstallation
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).
Smoke Detectors
Since there are always several potential sources of fire in
any home, we recommend installing smoke detectors. If
possible, install the smoke detector in a hallway adjacent
to the room (to reduce the possibility of occasional false
activation from the heat produced by the appliance). If your
local code requires a smoke detector be installed within
the same room, you must follow the requirements of your
local code. Check with your local building department for
requirements in your area.
Codes and 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 ANSI Z21.88/CSA 2.33 Standard for Vented
Gas Fireplace Heater and CGA 2.17-M91 and UL 307B Gas
Burning Heating Appliances for Manufactured (Mobile)
Homes in both USA and Canada.
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.
Check all local building and safety codes before installation.
The installation instructions and appropriate code require-
ments must be followed exactly and without compromise.
In the absence of local codes the following standards and
codes must be followed.

5
Inspection
The state or local gas inspector of the side wall horizontally vented gas
fueledequipmentshallnotapprovetheinstallationunless,uponinspection,
the inspector observes carbon monoxide detectors and signage installed
in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.
Exemptions
The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
• The equipment listed in Chapter 10 entitled “Equipment Not Required
To Be Vented” in the most current edition of ANSI Z233.1 / NFPA 54
(In Canada CAN/CSA B149.1 - current edition) as adopted by the
Board; and
• Product Approved side wall horizontally vented gas fueled equipment
installed in a room or structure separate from the dwelling, building
or structure used in whole or in part for residential purposes.
MANUFACTURER REQUIREMENTS
Gas Equipment Venting System Provided
When the manufacturer of Product Approved side wall horizontally vented
gas equipment provides a venting system design or venting system com-
ponentswiththeequipment,the instructionsprovidedbythemanufacturer
for installation of the equipment and the venting system shall include:
• Detailed instructions for the installation of the venting system design
or the venting system components; and
• A complete parts list for the venting system design or venting
system.
Gas Equipment Venting System NOT Provided
When the manufacturer of a Product Approved side wall horizontally
vented gas fueled equipment does not provide the parts for venting the
flue gases, but identifies “special venting systems”, the following require-
ments shall be satisfied by the manufacturer:
• The referenced “special venting system” instructions shall be included
with the appliance or equipment installation instructions; and
• The “special venting systems” shall be Product Approved by the
Board and the instructions for that system shall include a parts list
and detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall
horizontally vented gas fueled equipment, all venting instructions, all
parts lists for venting instructions and/or all venting design instructions
shall remain with the appliance or equipment at the completion of the
installation.
• 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.
New York City, New York (MEA)
Installation of these fireplaces are approved for installation in New York
City in the US state of New York (MEA#: 138-07-E).
Commonwealth Of Massachusetts Require-
ments
(Massachusetts Approval #G3-0806-6)
Note: The following requirements reference various Massachusetts
and national codes not contained in this document.
For all side wall horizontally vented gas fueled equipment installed in every
dwelling, building or structure used in whole or in part for residential
purposes, including those owned or operated by the Commonwealth and
where the side wall exhaust vent termination is less than seven (7) feet
above finished grade in the area of the venting, including but not limited
to decks and porches, the following requirements shall be satisfied:
Installation Of Carbon Monoxide Detectors
At the time of installation of the side wall horizontal vented gas fueled
equipment, the installing plumber or gas-fitter shall observe that a hard
wired carbon monoxide detector with an alarm and battery back-up is
installed on the floor level where the gas equipment is to be installed.
In addition, the installing plumber or gas-fitter shall observe that a bat-
tery operated or hard wired carbon monoxide detector with an alarm is
installed on each additional level of the dwelling, building or structure
served by the side wall horizontal vented gas fueled equipment. It shall
be the responsibility of the property owner to secure the services of
qualified licensed professionals for the installation of hard wired carbon
monoxide detectors.
In the event that the side wall horizontally vented gas fueled equipment
is installed in a crawl space or an attic, the hard wired carbon monoxide
detector with alarm and battery back-up may be installed on the next
adjacent floor level.
In the event that the requirements of this subdivision can not be met
at the time of completion of installation, the owner shall have a period
of thirty (30) days to comply with the above requirements; provided,
however, that during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be installed.
Approved Carbon Monoxide Detectors
Each carbon monoxide detector as required in accordance with the
above provisions shall comply with NFPA 720 and be ANSI/UL 2034
listed and IAS certified.
Signage
A metal or plastic identification plate shall be permanently mounted to
the exterior of the building at a minimum height of eight (8) feet above
grade directly in line with the exhaust vent terminal for the horizontally
vented gas fueled heating appliance or equipment. The sign shall read, in
print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”

6
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 blower motor requires 120 Volts AC for operation.
The fireplace is not dependent on the blower 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 Medina insert, an insert body, face, surround
(flange) kit are required.
Insert Body Packaging List
1 Insert Body with Burner Cassette
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 Face Kits - One Required
(kit is shipped in 2 boxes)
• Black Traditional Face, Surround, 27" x 39",
and Black Trim
• Arched Black Face, Surround, 27" x 39",
and Black Trim
Surround Components Include:
1 Top Surround
2 Side Surrounds
3 Black Extruded Trim Pieces
2 Elbowed Trim Fasteners
Inset Kits (Arch Face Kits Only)
Sold Separately
• Aspen
• Napa
• Pacific
• Tuscan
WARNING: Failure to position the parts in accordance
with these diagrams or failure to use only parts specifi-
cally approved with this appliance may result in prop-
erty damage or personal injury.
Medina™ (MED)
RATINGS NATURAL GAS LP GAS
Max/Min Input BTUh 0-2,000 Feet
(0-610 M)u
25,000/17,500 25,000/18,500
Manifold Pressure (IN. WC)
3.5 10.0
Min. Inlet Pressure (IN. WC)
5.0 10.5
P4 Efficiency v
63.95% 67.20%
Orifice (DMS) 0-2,000 Feet (0-610 M)u
#41 (.096") #53 (.0595")
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

7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Insert Dimensions Minimum Fireplace Cavity
Top View
Side View
A
B
C
D
Figure 1
Figure 2
Figure 3
31-1/4”(794mm)
7-1/4”
(184mm)
2-1/2”
(64mm)
15-3/4”
(400mm)
Air Intake
Flue
13”
(330mm)
14-1/2”
(368mm)
16”(406mm)
17-1/4”
(438mm)
7-1/2”
(191mm)
15-1/4”
(387mm)
CAUTIONS
•Trim panels or surrounds must not seal ventila-
tion openings in the existing fireplace that the
appliance is installed in.
•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
drawnintotheheatcirculationblowerandblown
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,whichis removed,mustbe
retainedsotheycanbereinstalledtorestorethe
fireplace to its original operating condition. The
removal of any part must not alter the integrity
oftheoutershellofthepre-engineeredfireplace
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.
Minimum Fireplace Opening Required
A = 31-1/4” (794mm) Front Opening
B = 17-1/4” (438mm) Height
C = 19” (483mm) Rear Width**
D = 16” (406mm) Fireplace Depth
* Top air duct will need to be removed for short ZC applica-
tions. Replace tap tights when removed.
**This dimension is with the air duct hood removed (see
Page 10).
Insert Dimensions
Width of insert behind Surround Panels 31-1/4" (794mm)
Rear height 17-1/4" (438mm)
Insert depth into fireplace 15-3/4" (400mm)
Flue center line from back of surround with 45º
collar
13-3/4" (349mm)
Flue collar diameter (OD) 2-15/16" (75mm)

8NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Facing and
Mantel -
Side View
Facing and Mantel clearances
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.
G 13”(330mm) 10”(254mm) 0”(0mm)
H 0”(0mm) 2”(21mm) 4”(102mm)
E
H
F
G
J
C
L
MANTEL
TRIM
Mantel
Trim
Hearth / Floor Protection
Minimum Clearances to Combustibles
Minimum clearances include any projections such as
shelves, window sills, mantels, spacers/standoffs or
surfaces to combustible construction etc. above the ap-
pliance. Paint or lacquer used to finish the mantel must
be heat resistant in order to avoid discoloration.
The letters below, E through J, correspond to Figure 4
showing minimum clearances required from the appliance
to combustibles and the minimum projection of the hearth
extension.
E = 31-1/2" (800 mm) from Top Facing to Bottom of
Insert
F = 25-1/2” (648 mm) from Center of Glass to Side Facing
or Side Wall
J = 39” (991 mm) from 10.5” (267 mm) Mantel to Bottom
of Insert
Hearth Protection
G = Minimum Hearth Protection from Front of Insert*
H = Vertical Distance from Insert Bottom to Combustible
Material.
3"/76mm
3"/76mm
3"/76mm
1-1/2”
38mm
31-1/2”
800mm
33-1/2”
851mm
36-1/2”
927mm
39-1/2”
1003mm
clearances
Figure 4
Figure 5

9
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Vertical Venting
The vent pipes must be connected to the proper collars on
the unit and the exhaust vent pipe must be connected to the
termination cap or the unit will not operate. The combustion
air vent pipe can be connected to the termination cap or it
can terminate inside the chimney.
The bottom opening of the chimney must be sealed around
the vent pipes if the combustion air vent is not connected
to the termination cap. Use unfaced fiberglass insulation to
seal around the vent pipes. The insulation may give off an
odor during the first hour of operation.
Note: The minimum vertical rise (exhaust vent) is 10 feet
(3.1 M) and the maximum vertical rise is 35 feet (10.7 M).
These dimensions are measured from the starting collars
of the unit to the end of the vent pipe.
Thefireplaceandfireplacechimneymustbecleanandingood
workingorderandconstructedofnon-combustiblematerials.
Inspect chimney cleanouts for proper fit and seal.
* Otherapproved ventcomponents include; StandardSimpson Dura-ventCo-linear
Chimney Liner Kit, Direct Vent Termination #991, Liner Termination Kit (includes
termination connector and flashing) #923GK and 3" x 35' Alum Flex #2280
Installation
Venting Installation
Your Lennox™ gas insert must be vented to the outside
in accordance with the current edition of the National Fuel
Gas Code ANSI-Z223.1 (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 ap-
pliance.
This gas insert requires a 3” diameter listed flex liner. The
vent should terminate with a listed direct vent termination
cap. The chimney should be sealed around the cap to pre-
vent air and rain from entering the chimney. Adhere to the
vent manufacturer's instructions for installation and vent
termination. These appliances are approved for use with
the following vent kits.
Vertical Cap
Termination
Connector
Exhaust
Intake
Combustion Air Intake
The existing fireplace chimneys may take
various contours which the flexible liners will
accommodate.However,keeptheflexibleliner
as STRAIGHT as possible, avoid unnecessary
bending.
Liner Requirements:
Vertical Height Min. = 10 ft. (3.1 M)
Vertical height Max. = 35 ft. (10.7 M)
Note: Measured from flue collar on
unit to the end of the vent pipe or liner
Use 3" (76 mm) diameter listed gas
vent liner (UL1777 ONLY) for the
EXHAUST
Use 3" (76 mm) diameter listed
liner (UL 181 or UL1777) for the
AIR INTAKE.
The flexible vent pipe
must NOT be allowed to
sag behind insert or in
fireplace flue.
The standard cap in Ter-
mination Kit TKDVI, and in
Vent Kit DV3FK35 is a high
wind cap
Makesurethatbothlinerswillpassthroughexistingdamperarea.Remove
or lock damper to allow the passage of the flexible liners. If the damper
will not allow the passage of both liners, DO NOT PROCEED FURTHER.
(If fireplace is masonry) Consult a local mason for removal of the damper
without risk of structural damage or leakage (if the fireplace is factory
built) The appliance may NOT be installed into the fireplace.
Figure 6
WARNING
Direct-VentFireplaceInsertVentRequirements-Useliner
listed to UL181 (Factory-made Air Ducts And Air Connec-
tors)orUL1777(ChimneyLiners)fortheAIRINTAKE. Use
liner listed to UL1777 ONLY for the EXHAUST.
Donotsubstitutetheheat-ratedflexliner(UL1777)forthe
exhaustwithanyothertypelinerorafiremayresultcaus-
ing property damage, personal injury or loss of life.
Vent Kits
Cat. No. Model Description
H0909 FKDVI Flex Liner Kit, DVI 3” X 35’ (requires 2,
one for exhaust and one for intake)
TKDVI TKDVI Termination Kit, DVI (termination cap and
flashing)
DV3FK35 DV3FK35 Flex Liner and Termination Kit, 3" X 35'
(includes 2 flex liners, termination and
gear clamps)

10 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 must be clearly marked with the
metal label that states: "This fireplace has been altered and
is no longer safe to operate." The insert is designed to fit
into a ZC fireplace with a minimum firebox height of 17-1/4"
(438mm). To facilitate this the hood will need to be removed
and discarded (Note: The screws should be replaced in the
insert body). Installation of the flue collar is removable (see
Flue Collar Connection).
If the factory-built fireplace has no gas access hole(s) pro-
vided, an access hole of 1-1/2" (37.5 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.
Log Set Installation
If logs are not installed according to the log installation
instructions,flameimpingementandimpropercombustion
could occur and result in soot and/or excessive produc-
tion of carbon monoxide (CO), a colorless, odorless,
toxic gas.
The size and position of the log set is critical to achieve
a safe, reliable and attractive flame pattern. Any attempt
to use a different log set in the fireplace will void the war-
ranty and will result in incomplete combustion, sooting
and poor flame quality.
*Brick Panels are not offered for the Medina™ Gas Insert.
1. Removelograck (2screws)and installrear logon retainer.
See Figures 7 and 8).
2. Reinstall log rack with rear log. IMPORTANT!!! SCREWS
PASS THROUGH LOG RACK AND BURNER PAN.
Figure 7
Figure 8
Figure 9
Retainer
Rear log
2 Screws
3. Install light layer of mineral wool directly over ports. See
Figure 9.
- A light layer will give a more constant rear flame.
- A heavy layer will give more glow, but will need to be
adjusted after light up.
4. Install front logs on retainer slots. See Figure 10.
5. Place top log on pin. See Figure 11.
6. Place black embers around perimeter of mineral wool.
Important!!! Do not cover ports with black embers. See
Figure 11.

11
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Top Log
Ports
Install front logs on retainer slots.
Place top log on pin.
Figure 10
Figure 11
Surround Panels Installation
The Medina 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.
1. Remove the speed nuts (A in Figure 12)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 (B in Figure 12). A flat bladed screwdriver
may help in installing the nuts.
2. Install all surround panels and trim with the insert po-
sitioned in the fireplace but a few inches in front of its
final location.
3. 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 slot-
ted 1/4" truss screws for each side surround panel and
secure loosely.
Face Installation
The faces come with hooked brackets. To install the face,
hang the hooked brackets on the surround brackets per
instructions provided in decorative face kit (C in Figure
12).
Figure 12
A
B
C
Spring Handle Latches
Door Mounting Plates
Front Logs
4. 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.
5. 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.
6. 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.
7. Install three spring clips (found in parts bag in firebox)
in each piece of trim by inserting them between the
rear of the surround panel and the channel of the trim.
The spring clips will push the trim tight to the surround
panel.

12 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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 Clear-
ances to Combustibles).
The Medina™ gas insert must be connected to the gas line
in accordance with local codes and/or the National Fuel
Gas Code, ANSI Z223.1 (In Canada, the current CAN/CSA
B149.1 installation code). The insert comes with an 8" nipple
attached to the supply side of the gas valve. After connect-
ing the gas line, all joints in the line and connections at the
valve should be checked for leaks before final positioning of
the unit. Conduct a gas leakage test of the appliance piping
and control system downstream of the shutoff valve in the
supply line to the appliance.
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 screwdriver 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 screwdriver 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.
LP and Natural Gas Supplies
Your Medina™ 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 Medina gas insert has an air shutter control lever lo-
cated behind the lower door on the insert's face and to the
left of the gas valve (see Figures 14 and 15). 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 techni-
cian. The insert should burn for about 15 minutes with the
logs installed before adjusting the air shutter. More air will
result in shorter flames and less color, less air will result
in bigger flames and more color. To adjust the air shutter,
insert a regular screwdriver into the slide adjustment and
slide it side to side (see Figures 14 and 15). 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 burn-
ing, 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.
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" WC 5.4” WC
Robertshaw Millivolt Gas Valve
TP/TH
TH
TP
Inlet (Supply)
Pressure Tap
Figure 13
The Manifold
(Outlet) Tap

13
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Operating Instructions
Pre-lighting checklist
Be sure to check these items before the initial lighting of
the insert:
cThe insert gas label corresponds to the gas supply avail-
able - that is "natural gas" for natural gas or "LP gas" for
LP gas.
cGas pressure has been checked carefully - see Page 12.
cAll gas fittings have been checked for leaks.
cAll clearances to combustibles have been met-see Page 8.
cAll combustible materials have been removed from the
area in front of the insert.
cAll vented areas of the insert face are unobstructed.
cHouse is ventilated to clear initial paint curing odors - see
Page 15.
cAll packaging materials have been removed from the
firebox.
cWhile insert is cool, fingerprints or other marks have been
cleaned 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.
cLog set have been installed.
cThe glass door is in place and is properly sealed.
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 PROP-
ERTY DAMAGE, INJURY, OR LOSS OF LIFE.
CAUTION: HOT WHILE IN OPERATION. DO NOT TOUCH. KEEP
CHILDREN, FURNITURE, GASOLINE AND OTHER LIQUIDS WITH
FLAMMABLEVAPORSAWAY.NEVEROPERATEUNITWITHGLASS
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.Ifyoucannotreachyourgas 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.
Moving shutter
bracket to the right
will open shutter,
to the left will close
shutter.
Figure 14
Figure 15
SHUTTER ADJUSTMENT DETAIL
See Detail Shutter
Adjustment
Shutter Adjustment Detail

14 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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.
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
combustion and ventilation air.
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.
PILOT ASSEMBLY
Thermopile
Veilleuse à gaz Igniter (electrode)
Allumeur
Thermocouple
Gas Pilot Hood
Robertshaw Millivolt Gas Valve
TP/TH
TH
TP
GasControlKnob
(Pilot/On/Off)
OFF
ON
PiezoIgniter
Allumeur ON/OFF Switch
Interrupteur
FlameHeightControl
Knob(HI/LO)
Figure 16
WARNINGS
• Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. For assistance or additional
information,consultaqualifiedinstaller,service
agency or your gas supplier.
• Operation of this appliance when not connected
to a properly installed and maintained venting
system can result in carbon monoxide (CO)
poisoning and possible death.
• Carbon monoxide poisoning – early signs of
carbon monoxide poisoning resemble the flu
with headaches, dizziness, or nausea. If you
have these signs, get fresh air at once! Have
the heater inspected by a qualified service
technician. Some people are more affected by
carbon monoxide than others. These include
pregnant women, people with heart or lung
disease or anemia, those under the influence
of alcohol and those at high altitudes.

15
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Flame Color and Behavior
Your Medina™ gas insert is designed for maximum heating
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 flamesto turnorangesooner
may result in poor combustion, sooting and a hazardous
situation. See the drawing to the right showing proper flame
appearance.
When testing for proper operation - If an optional thermo-
stat is installed adjust it to its highest temperature setting.
Visually determine that main burner gas is burning properly:
i.e., no floating, lifting or flashback. Adjust the primary air
shutter(s) as required. Check for proper main burner opera-
tion at both high and low flame.
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
Figure 17
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 an
unpleasant odor. It is recommended that persons sensitive
to an imbalance in the indoor air quality avoid the insert
during the curing process.
Quiet Operation
As the Medina™ gas insert is burning, a number of normal
operationalsoundsmaybeheard.Theflowofgasthroughthe
gas valve and orifice may make a rushing or whistling noise.
If this noise is objectionable, it can be reduced by turning
down the flame. Turning down the flame can reduce total
heat output by more than 30%. When the blower turns on,
the sound of rushing air may be heard. The blower sounds
may be reduced by adjusting the speed control located on
the blower assembly. Also, a slight clicking sound may be
heard as the gas valve or blower switch turn on and off.
Blower Operation
Your Medina 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)plugfor yourprotectionagainstshockhazard
and should be plugged directly into a properly grounded
three-prong receptacle. Do not cut or remove the ground-
ing prong from this plug.
2. After the insert warms up, the blower will turn on if the
speed control (located at the right below the firebox) is
left in the "ON" position. The blower will not operate until
the insert is warm.
3. Once the blower turns on, turn the knob to the desired
speed. No further adjustment is necessary.
4. If you do not wish to have the blower on, turn the knob
until it clicks into the "OFF" position.
Optional Wall Thermostat
If an optional wall thermostat is to be installed, install the
thermostatperthemanufacturersinstructions(providedwith
thethermostat). Failuretofollowmanufacturersinstructions
could result in a malfunction. Pay special attention to the
thermostat location requirements. If the location require-
ments are not adhered to the appliance, erratic operation
or failure may occur.
Do not mount the thermostat where it may be affected by:
• Radiant heat from this appliance, fireplaces, sun or other
heat sources.
• Drafts or dead spots behind doors or in corners.
• Hot or cold air from ducts.

16 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Millivolt Control Schematic
Sparker Pilot Hood
ON/OFF Rocker Switch,
Thermostat, or Remote
Thermostat
Pilot Assembly
Thermocouple
Piezo Igniter
White
Gas Inlet
Pilot Gas Line
Thermopile
Brown
Wiring Terminals
Operating Options
The rocker switch on your Medina™ gas insert is 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-mounted switch, a millivolt wall thermostat, or a
remote control, can be used to supplement the rocker
switch. The gas valve is powered by millivolts generated by
the pilot assembly. This millivolt system is very sensitive to
electrical resistance, therefore, make sure all connections
are tight, clean and free from corrosion. Do not splice any
millivolt wires. Consult the table on this Page to determine
the proper gage of wire for the thermostat or wall switch
connections. This table refers to the total length 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 mil-
livolt 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 affect the
system resistance and increase the chance of the burner not
igniting.Follow theinstructionsincludedwith thethermostat
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.
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
Millivolt Control System
This fireplace operates on a millivolt control system. As
such, no additional power supply is needed for the fireplace
to heat. The pilot assembly contains a thermocouple, that
when heated by the pilot flame, generates electricity (mil-
livolts- mV=1/1000 of a volt) which opens a valve allowing
gas to flow to the pilot assembly. The pilot assembly also
contains a thermopile, that when heated by the pilot flame,
generates electricity that flows to terminal #1 (labeled
THTP) on the gas valve. When the electricity is conducted
from terminal #1 through the on/off switch, thermostat, or
receiver of the remote control to terminal #3 (labeled TH)
on the gas valve, the main burner will ignite.
TH
TP
TH/TP
Figure 18

17
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Maintenance and Servicing
Maintenance Checklist
The following should only be performed by a qualified
service technician.
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:
oWhen unit is 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 service technician adjust the burner for proper
combustion.
oClean inside of glass with gas fireplace glass cleaner.
NEVER attempt to remove or clean the glass when the
unit is hot.
oCheck the hot air outlet vents for lint or other accumula-
tions. Never block or restrict vent openings, obstruct flow
of ventilation air, or use vents other than those approved
for use with the Medina gas insert.
oCheck that the chimney and its outlet are open and free
of soot, blockage, or debris.
oCheck gaskets once a year. Gaskets must be tight. Replace
if necessary.
oInspect the pilot system for proper flame. NEVER ADJUST
THE PILOT until after the gas pressure has been checked
and the supply lines have been completely bled (this may
take an hour or more when bleeding through the pilot).
All pilots are checked and burned at the factory prior to
shipment.Thepilot adjustment screwis locatedbelow the
ON/OFF/PILOT control knob. Remove the pilot adjusting
cover with a flat-bladed screwdriver to access the pilot
adjusting screw. Adjust the pilot screw to properly size the
flames. The flames should directly contact the thermopile
and extend across the main burner ports. Be careful not
to back the screw out of its threads. Replace the cover
and check for gas leaks using a gas leak test solution.
oCheck that the area around the insert is kept clear and is
free of combustible materials, gasoline and other flam-
mable vapors and liquids.
oCheck the millivolt system as per the table on this
page.
2.The viewing glass should be cleaned periodically (see
Glass Maintenance).
Glass Door Cleaning and 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.
Glass Replacement: The glass in the insert door cannot be
replaced 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
yourLennoxHearthProductsdealer.The
glassisneo-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.
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
ProPer Pilot FlaMe aPPearance
Figure 19

18 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Blower Snap Switch
Blower Speed Control
White
Ground (Green)
Black
Blower
Black (Hot)
White (Neutral)
Power Source
Blower Wiring Schematic
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.
Fuel Conversion
Converting your Medina™ gas insert between natural gas
and LP can be accomplished by installing a conversion kit
(valve regulator and burner orifice). Only a qualified service
technician should perform the conversion.
Conversion Kit: Please see instructions provided with
conversion kit.
Blower Removal
Unplug the power supply cord from the electrical outlet
prior to removing the blower. The blower 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 blower wiring diagram below for ref-
erence).
Remove the insert face, glass door and log set. All of these
items are fragile so handle them with care. 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 blower and then lift the panel with the blower attached
out of the firebox. To reinstall the blower, repeat these steps
in the reverse order.
Electrical Requirements:
This gas insert operates without an outside power source,
however the blower requires a 120 Volt electrical service
outlet. This appliance, when installed, must be electrically
grounded in accordance with local codes, or in the absence
of local codes, the National Electrical Code ANSI/NFPA 70
- latest edition. (See Operating Options for thermostat and
ON/OFF switch information).
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.
Figure 20
Figure 21
(B) Door Mounting Plates
(A) Spring Handle Latches
and

19
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
Thin black coating (soot)
forms on the viewing
glass, logs, or firebox
Improper log or ember
placement
Improper air shutter
setting
Not enough combus-
tion air
See Log Set Installation on Page 10. If there is soot in one specific location, the
rockwool below this location needs to be adjusted. This can be done by pulling embers
forward slightly. If the flames have soot tails, the shutter will need to be opened.
If sooting continues open air shutter (see Air Shutter Adjustment on Pages 12 and 13).
Check for debris obstructing air flow in valve compartment under insert or in front of
lower venting.
Humming or whistling
coming from insert.
Normal operating noise
Obstructed orifice
opening
See Quiet Operation on Page 15. The noise may be reduced by slightly turning down the
flame. Turning the flame down will reduce the heat output of the insert.
If noise is excessive or is “whistling” have your gas supplier check the regulator and
orifices and replace if necessary.
A change in flame appear-
ance or burner operation.
A change in gas pres-
sure
Improper ember place-
ment
Have your gas supplier check for correct gas pressure (7" W.C. / po. C.E. [1.74 kPa] natu-
ral gas; 11" W.C. / po. C.E. [2.74 kPa] LP gas). NOTE: NEVER BLOCK OR OBSTRUCT AIR
INTAKE OR OUTLET VENTS.
See Log Set Installation on Page 10.
Spark igniter will not light
pilot after repeated tries.
No gas supplied to unit
or air in line
Defective igniter (no
spark at electrode)
Defective or misaligned
electrode at pilot (spark
at electrode)
Check gas supply. To purge, hold in gas cock on valve for 1-2 minutes and try again.
Check for spark at electrode and pilot, if no spark and electrode wire is properly con-
nected, replace igniter and igniter wire.
Using a match, light pilot. If pilot lights, turn off pilot and trigger the igniter again. If pilot
lights, an intermittent gas/air supply may be the problem, if longer purge will not light
- check gap between electrode and pilot - should be 1/8 inch (3 mm) to have a strong
spark. If OK, replace pilot.
Pilot will not stay lit after
carefully following lighting
instructions.
Low gas inlet pressure
Defective thermopile
Defective automatic
valve operator
Check inlet pressure and adjust pilot if necessary.
Be sure wire connections from thermopile are tight at gas valve terminals.
Either rocker switch or thermostat wires may be grounded. Remove wires from valve
terminals. If pilot stays lit, trace switch wiring for a ground. May be grounded to insert or
gas supply.
Check open circuit millivolt output of thermopile. Reading should be greater than 325mV.
Also check thermopile wire for kinks that can cause loss of mV. Replace faulty thermopile
if wire is okay and reading is less than 325mV.
Turn valve knob to “ON” and thermostat (if installed) to 90º. Millivolt meter should read
greater than 100 mV. If reading is OK and burner does not turn on, replace gas valve
(qualified service technician only).
Main burner will not burn. Pilot has gone out
Rocker switch, thermo-
stat, or wires defective
Thermopile may not be
generating sufficient
millivolts
See Lighting Instructions.
Disconnect rocker switch and thermostat wires at terminals 1 and 3 on valve. Jumper
across from 1 to 3 with pilot lit. If burner comes on either rocker switch, thermostat, or
wiring is not functioning.
Check thermopile with millivolt meter (see Maintenance and Servicing), recheck symp-
tom #2.
Troubleshooting
NOTE: When troubleshooting the gas control system, be sure the external gas shut off valve, located at the gas sup-
ply inlet is in the “ON” position.
IMPORTANT: Call your gas supplier or plumber for additional help with any gas control problem. Valve system
troubleshooting should only be accomplished by a qualified service technician.

20
Replacement Parts
Medina™ (MED)
Part Number Description
H6033 Cassette Assembly, NG
(if LP, also requires H5464 conversion kit)
H6010 Main Burner Assembly
H5922 Pilot Assembly, Convertible NG or LP
H5938 Gas Control Valve, NG
(if LP, also requires H5941 regulator kit)
H5939 Regulator, NG
H5941 Regulator, LP
H5965 Orifice, Main Burner, NG #41
H5953 Orifice, High Altitude, Main Burner, NG #42
H5964 Orifice, Main Burner, LP #53
H5951 Orifice, High Altitude, Main Burner, LP #54
H5464 Conversion Kit, NG to LP
H5465 Conversion Kit, LP to NG
H6013 Blower w/Mounting Bracket
H5875 Blower Snap Switch
H5655 Blower Speed Control (rheostat)
H5744 On/Off Switch
H6007 On/Off Switch Wires
H5745 Piezo Igniter
H4635 Wall Thermostat, Digital
70005 AC Remote Control Thermostat
H0251 DC Remote Control, Deluxe, Thermostat
H5975 Power Cord
H5977 Blower Wire
H5730 Speed Control Wire (for rheostat)
H5869 Log Set
H5863 Bag of Embers (volcanic stone)
H5864 Bag of Rockwool
H5990 Firebox Door w/Glass
H5989 Hardware Package
H5839 Log Set Support