Lennox Hearth Products MPD35ST-NE User manual

Preliminary
Preliminary
04-01-05
04-01-05
HOMEOWNER'S CARE AND
OPERATION INSTRUCTIONS
DIRECT VENT SEE-THROUGH
MERIT®PLUS SERIES
DIRECT-VENT GAS FIREPLACE HEATERS
OTL Report No. 116-F-28-5
A French manual is available upon request. Order P/N 875,025CF
Ce manuel d’installation est disponible en francais, simplement en
faire la demande. Numéro de la pièce 875,025CF
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Millivolt Models Electronic Models
MPD35ST-NM MPD35ST-NE
MPD35ST-PM
P/N 875,025M REV. NC 04/2005
FOR YOUR SAFETY: Do not store or use gasoline
or other flammables or liquids in the vicinity of
this or any other appliance.
FOR YOUR SAFETY: 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 suppliers
instructions.
• If your gas supplier cannot be reached, call
the fire department.
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
MODELS
WARNING: IFTHEINFORMATION INTHISMANUAL
IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLO-
SIONMAY RESULTCAUSINGPROPERTYDAMAGE,
PERSONAL INJURY OR LOSS OF LIFE.
Listing Agency

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
2
CONGRATULATIONS!
In selecting this LENNOX Direct-Vent Gas Appliance you have chosen the finest and most
dependable fireplace to be found anywhere. Its a beautiful, prestigious alternative
to a wood burning fireplace. Welcome to a Family of tens of thousands of satisfied
LENNOX Fireplace Owners.
Please carefully read and follow all of the instructions found in this manual. Please pay
special attention to the safety instructions provided in this manual. The Homeowner's
Care and Operation Instructions included here will assure that you have many years
of dependable and enjoyable service from your LENNOX product.
INTRODUCTION
The Fireplace models covered in this manual
areDirect-Ventsealedcombustiongasfireplace
heaters designed for residential application.
Direct-Vent appliances operate with the com-
bustion chamber completely isolated from the
indoor environment. All air for combustion is
brought in from the outside and exhaust gases
are vented through thesamedirectvent,co-axial
(intake/exhaust) vent system.
The Millivolt appliances have a millivolt gas
control valve withpiezoignitionsystemprovides
safe, efficient operation. If any optional acces-
sories which require electrical power are being
installed, the electrical power must be provided
at the time of appliance installation.
The Electronic appliances have an electronic
intermittentpilot system provides safe, efficient
operation. External electrical power is required
to operate these appliances.
GENERAL INFORMATION
Note: Installation and repair should be per-
formed by a qualified service person. The
appliance should be inspected annually by a
qualified professional service technician. More
frequent inspections and cleanings may be
required due to excessive lint from carpeting,
bedding material, etc.
These appliances comply with National Safety
Standards and are tested and listed by OMNI-
Test Laboratories, Inc. (Report No.116-F-28-5)
to ANSI Z21.88a-2003 (in Canada, CSA-2.33a-
2003), and CAN/CGA-2.17-M91 inbothUSA and
Canada, as vented gas fireplace heaters.
The Installation must conform to local codes
or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1/NFPA
54-latest edition, or the Natural Gas and
Propane Installation Code, CSA B149.1-latest
edition. The appliance, when installed, must
be electrically grounded in accordance with
local codes or, in the absence of local codes,
the latest edition of the National Electrical Code,
ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.1 - latest editions.
TABLE OF CONTENTS
Introduction ......................................Page 2
General Information ..........................Page 2
Gas Controls Access .........................Page 4
Operation / Care of Your Appliance ...Page 4
Variable Flame Adjustment................Page 5
Maintenance......................................Page 5
Front Glass Enclosure Panel,
Removal and Installation.................Page 6
Install Grate, Vermiculite
Embers & Logs .................................Page 7
Burner Flame Appearance & Sooting Page 9
Burner Flame Adjustments................Page 9
Millivolt Appliance Checkout .............Page 10
Electronic Appliance Checkout..........Page 10
Wiring Diagrams...............................Page 11
Warranty ...........................................Page 11
Product Reference Information.........Page 11
Accessory Components ....................Page 12
Lighting Instructions – Millivolt ........Page 15
Lighting Instructions – Electronic .....Page 16
Maintenance Schedule ......................Page 17
Troubleshooting Guide – Millivolt .....Page 18
Troubleshooting Guide – Electronic ..Page 18
Replacement Parts List .....................Page 20
IMPORTANT
It is imperative that the control
compartment, burners and circu-
lating air passage ways of appli-
ance be kept clean. See Mainte-
nance instructions on Page 5.
Electronic Models -
Electronic models have a fixed rate gas valve.
The BTU Input for electronic models is shown
in Table 2:
Gas Pressure -
Tables 3, 4 and 5 show the appliances' gas
pressure requirements.
Inlet Gas Supply Pressure
(all models)
Fuel # Minimum Maximum
Natural Gas 5.0" WC
(1.24 kPa)
10.5" WC
(2.61 kPa)
Propane 11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 3
Input (BTU) - Fixed Rate
(electronic models)
Models Fuel
Type
Input Rate
(BTU / HR)
MPD35ST-NE Nat. Gas 30,000
MPD35ST-PE
(if field converted)
Pro. Gas 28,000
Table 2
Manifold Gas Supply Pressure
(millivolt models)
Fuel # Low High
Natural
Gas
(Lo) 2.2" WC
(.55 kPa)
(Hi) 3.5" WC
(.87 kPa)
Propane (Lo) 6.3" WC
(1.57 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 4
Input (BTU) Manually-Modulated Gas
Valves (millivolt models)
Models Fuel
Type
Input Rate
(BTU / HR)
MPD35ST-NM Nat. Gas 30,000 high
23,000 low
MPD35ST-PM Propane 28,000 high
22,000 low
Table 1
Provide adequate clearances around air open-
ings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front openings of the appliance.
Due to high temperatures the appliance should
be located out of traffic and away from furniture
and draperies. Locate furniture and window
coverings accordingly.
These fireplaces are designed as supplemen-
tal heaters. Therefore, it is advisable to have
an alternate heat source when installed in a
dwelling.
Theseappliancesaredesignedtooperateonnatural
gas or propane gas only. The use of other fuels or
combination of fuels will degrade the performance
of this system and may be dangerous.
Millivolt Models - BTU Input
Millivolt models come standard with the manu-
ally-modulated gas valve; flame appearance and
heat output can be controlled at the gas valve.
The BTU Input for millivolt models is shown
in Table 1:

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 3
Test gauge connections are provided on the
front of the millivolt gas control valve, identified
IN for the inlet and OUT for the manifold side
(see Figure 2 on Page 4 ). A 1/8" NPT Test
gauge connection is provided at the inlet and
outlet (manifold) ports on the electronic gas
control valve (see Figure 3 on Page 5 ).
WARNING
Failure to comply with the instal-
lation and operating instructions
provided in this document will
result in an improperly installed
and operating appliance,voiding
its warranty. Any change to this
appliance and/or its operating
controls is dangerous. Improper
installation or use of this appli-
ance can cause serious injury or
death from fire, burns, explosion
or carbon monoxide poisoning.
WARNING
Do not use these appliances if
any part has been under water.
Immediately call a qualified,
professional service technician
to inspect the appliances and to
replace any parts of the control
system and any gas controls
which have been under water.
Manifold Gas Supply Pressure
(electronic models)
Fuel # Fixed
Natural Gas 3.5" WC
(.87 kPa)
Propane 10.0" WC
(2.49 kPa)
Table 5
Burn-in Period
During the first few fires of this appliance there
will be some odor due to the curing of the
paint and burning off of lubricants used in the
manufacturing process.
Depending on your use, the burn-in period may
take a few hours or a few days.
KEEP YOUR HOUSE WELL VENTILATED
DURING THE CURING PROCESS. THE ODOR
AND HAZE EMITTED DURING THE CURING
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR.
If an optional blower is installed, Do not turn it
on during the Burn-In period.
A white film may develop on the glass front
during the first few fires as part of the curing
process. The glass should be kept clean during
thefirst two weeks of use to prevent the film from
baking on (making it very difficult to remove).
See Cleaning Glass on Page 5.
WARNING
If the information in this
manual is not followed
exactly,a fireorexplosion
may result causing prop-
erty damage, personal
injury or loss of life.
IMPORTANT
These appliances must not be
connected to a chimney or flue
serving a separate solid fuel
burning appliance.
Orifice Sizes - Sea Level to High Altitude
(All Models)
These appliances are tested and approved for
installations at elevations of 0-4500 feet (0-1372
meters)above sealevelusing thestandardburner
orifice sizes (marked with an "*" in Table 6 ). At
the time of installation, it must be determined
if the appliance needs to be derated. Contact
your local gassupplier for deration requirements
for your area.
Deration - At higher elevations, the amount of
BTU fuel value delivered must be reduced by
eitherusing gas that has been derated by thegas
company or by changing the burner orifice to a
smaller size as regulated by the local authorities
having jurisdiction and by the (USA) National
Fuel Gas Code NFPA 54 / ANSI Z223.1 - latest
edition or, in Canada, the CAN1-B149.1 and .2
codes - latest edition.
Burner Orifice Sizes (all models)
Elevation
Feet (meters)
Natural
Gas
drill size (inches)
Propane
Gas
drill size (inches)
0-4500
(0-1372)
#37 (.104") *
24M1001 •
1.55 mm (.061")*
42M7901 •
* Standard size installed at factory
• Part /Cat. Number
Table 6
WARNING
Do not attempt to alter or modify
the construction of the appli-
ance or its components. Any
modification or alteration may
void the warranty, certification
and listings of this unit.
WARNING
Improper installation, adjust-
ment, alteration, service or
maintenance can cause injury
or property damage. Refer to
this manual. For assistance or
additional information consult
a qualified installer, service
agency or the gas supplier.
WARNING
These fireplaces are vented
heaters. Do not burn wood or
other material in these appli-
ances.
WARNING
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.
WARNING
Do not place clothing or other
flammable materials on or near
this appliance.
These appliances and their individual shut-off
valves must be disconnected from the gas
supply piping system during any pressure
testing of that system at pressures greater
than 1/2 psig (3.5 kPa).
These appliances must be isolated from the
gas supply piping system (by closing their
individual manual shut-off valve) during any
pressure testing of the gas supply piping
system at test pressures equal to or less than
1/2 psig (3.5 kPa).

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
4
Control
Compartment Access panel
WARNING
Carbon monoxide poisoning:
early signs of carbon monoxide
poisoning are similar to the flu
withheadaches,dizzinessand/or
nausea. If you have these signs,
obtainfresh airimmediately.Turn
offthegas supply to the appliance
and have it serviced by a quali-
fied professional, as it may not
be operating correctly.
WARNING
Any safety guard or screen
removed for servicing the appli-
ance must be replaced prior to
operating the appliance.
WARNING
Children and adults should be
alerted to the hazards of high
surface temperatures. Use cau-
tion around the appliance to
avoid burns or clothing ignition.
Youngchildrenshouldbecarefully
supervised when they are in the
same room as the appliance.
Note: An Optional Screen Heat
Guard for the glass is available
(see Page 14 for ordering infor-
mation).
Gas Control Compartment Access
The gas controls canbe found behind the control
compartment access panel.
To open the control compartment access panel,
actuate the spring-loaded magnetic catches
securing the panel. First, depress the outer top
right corner of the panel until the catch "pops"
the door free. Then, gently pull the door forward
until the left top corner "pops" free, allowing the
panel to swing out and down to open.
On millivolt systems, the piezo igniter, HI/LO
flame adjustment knob, and pilot and main
gas OFF/ON control knob are located below
the glass panel enclosure. The gas valve for
electronic systems is also located below the
glass enclosure panel. See Figure 1.
To ease door closure, depress the catches to
place them in their retracted position, then
close the door.
TPTH TP TH
Note: The piezo igniter and burner
OFF/ON switch are located below
glass panel (see Figure 1).
H
I
LO
W
H
TPT
HT
P
T
P
I
L
O
T
P
I
L
O
T
O
N
it
O
F
F
IN OUT
Manifold Pressure Tap
Inlet Pressure Tap
SIT Millivolt Gas Valve
Main Gas
Control Knob
OFF/PILOT/ON
HI/LO Variable
Flame Height
Adjustment
Gas
Outlet
Gas
Inlet
Pilot Adjustment
Screw
Terminals
TPTH,TP & TH
HI/LO Variable
Flame Height
Adjustment
Main Gas
Control Knob
OFF/PILOT/ON
Figure 2
OPERATION AND CARE OF YOUR
APPLIANCE
The standard controls for appliance operation
are located behind the hinged drop-down panel
below the appliance front glass enclosure panel
(see Figure 1). Optional control switches are
also available (see Page 12 - Remote Wall
Switch, Remote Control or Wall Thermostat).
Operation of millivolt and electronic gas con-
trol systems are different. Before lighting and
operating your appliance determine if you have
a millivolt or electronic appliance. Familiarize
yourself with the gas control valve that your
appliance uses. Refer to Figure 1 for access
to the gas control valve.
Millivolt Appliances - Appliances with
Millivolt systems will be fitted with the gas
control valve shown in Figure 2.
Electronic Appliances - Appliances with
electronic systems will be fitted with the
electronic valve shown in Figure 3.
Millivolt Appliances -
To light millivolt appliances refer to the detailed
lightinginstructions found on Page 15 . Millivolt
appliance lighting instructions may also be
found on the pull out lightinginstruction labels
attached to the gas control valve.
Millivolt appliances are fitted with an OFF/ON
Rocker Switch located behind the control
compartment access panel, below the appli-
ance front glass enclosure panel (see Figure 1
for location). Once the pilot is lit, the OFF/ON
rocker switch will control the appliance OFF/ON
burner operation. To operate: Toggle the switch
between its ON and OFF positions.
If your millivolt appliance is equipped with an
optional remote switch kit (wall switch, remote
control or wall thermostat) and the pilot is lit,
the appliance main burner may be turned on
and off using the optional switch. When using
an optional remote switch, turn off the standard
OFF/ON switch.
Electronic Appliances -
To light electronic appliancesrefer to the detailed
lighting instructions found on Page 16. Elec-
tronicappliancelightinginstructionsmayalsobe
found on the pull out lighting instruction labels
attached to the gas control valve.
OFF/ON
(burner)
OFF
ON
IGNITER
Figure 1 - Gas Control Compartment Access
HI/LO (flame height
control knob)
OFF/PILOT/ON (gas control knob)
Gas Flex Line
Gas Valve
Piezo Igniter
OFF/ON Switch
Hinge Pin
Note:The gas supply
line must be installed
in accordance with
building codes by a
qualified installer
approved and/or
licensed as requed
by the locality. In
the Commonwealth
of Massachusetts,
installation must
be performed
by a licensed
plumber or gas
fitter.
Note: To prevent excessive resistance in burner
circuit (which can cause burner operation prob-
lems), only one burner control switch should be
wired to valve. Therefore, if an optional control
switch is installed, the standard Off/On switch
and wires should be removed.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 5
Figure 3
Honeywell Electronic Gas Valve
FFO
NI
PSI
NO
L
O
R
T
N
O
C
G
INT
IER
Manifold Pressure
Port
ON / OFF Switch
Inlet
Pressure
Port
Electronic Gas
Control Valve
Variable Flame Height Adjustment
(Millivolt Appliances only)
1. All Millivolt appliances are equipped with a
variable gas control valve. Flame height for
these models may be adjusted through a
range between fixed low and high settings
while the appliance is in operation. Adjust
the flame height as desired after lighting the
appliance by rotating the variableadjustment
control knob (HI/LO) located on the front of
the valve (refer to Figure 2 ).
2. During the first initial burns of these appli-
ances, there will be some odor emitted (see
Burn-In Period on Page 3 ).
3. Keep the lower control compartment clean
by vacuuming or brushing at least twice a
year. More frequent cleaning maybe required
dueto excessive lint from carpeting, bedding
materials, pet hair, etc. It is very important
that the control compartments, burners
and circulating air passageways of the
appliance are kept clean.
4. Always turn off gas to the pilot (millivolt
appliances) and let the appliance cool down
before cleaning. Before re-lighting, refer
to the lighting instructions in this manual.
Lighting instructions may also be found
on the pull out lighting instruction labels
attached to the gas control valve.
5. Always keep the appliance area clear and
free from combustible materials, gasoline
and other flammable liquids.
6. Remember,Millivoltapplianceshaveacontinu-
ousburningpilot flame. Exercisecautionwhen
using products with combustible vapors.
Before re-lighting the fireplace, refer to the
lighting instructions in this manual. Instruc-
tions are also found on pull-out panels
located below the glass door in the control
compartment.
Inspect Venting System
The appliance and venting system should be
thoroughly inspected before initial use and at
least annually by a qualified service technician
(inspection should includeensuring that exhaust
or intake passages are unobstructed and vent
components are properly assembled and not
damaged). If theventing system isdisassembled
for any reason, a qualified service technician
should follow vent installation instructions for
proper reassembly and proper sealing of the
venting system components. However, more
frequent periodic inspections and cleanings
should be performed by the homeowner.
Clean Lower Control Compartment
Keep lower control compartment clean by
vacuuming or brushing it out at least twice a
year (also clean the air venturi with a brush or
wire). More frequent cleaning may be required
due to accumulation of lint from carpeting,
bedding materials, pet hair, spider webs, etc. It
is very important that control compartments,
burners, circulating air passageways and air
venturi on the appliance are NOT obstructed
in any way.
Cleaning Glass
(see Front Glass Enclosure Panel, Removal
and Installation on Page 6)Note: Clean glass
after first two weeks of operation (after Burn-In
period is over) and then only when necessary
and when the fireplace is cool. Wipe surface
with clean, dampened, soft cloth. Follow with
dry, soft towel as desired. Take care not to
scratch the glass surface.
The viewing glass should be cleaned periodi-
cally to remove any build-up caused from the
following:
WARNING
Turn off gas and electrical power
before servicing the appliance.
CAUTION
Wear gloves and safety Glasses
for protection while doing
required maintenance.
IMPORTANT
Always verify proper operation
after servicing.
IMPORTANT
Do not use abrasive cleaners
on glass. Never clean the glass
when it is hot.
• During start-up, it is normal for condensa-
tion to form on the inside of the glass (this
condensation and fog will usually disappear
in a few minutes). The moisture can cause
lint, dust and other airborne particles to cling
to the glass surface.
• Initial curing of the high temperature paint
and burning off of lubricants used in the
manufacturing process may result in a film
on the glass.
• A white coating may form on the glass as a
result of impurities and minerals in the fuel.
It is recommended that the glass be cleaned
two or three times during each heating season,
depending on the circumstances present. The
following cleaning solutions are approved for use
to clean glass:
• Non-ammonia based household cleaner
• 50%-50% mix of white vinegar & water
• gas fireplace/stove glass cleaner
Inspect Glass Gasket - Visually inspect the
gasket on the backside of the glass enclosure
panels. The gasket surface must be clean, free
of irregularities and seated firmly.
Clean Logs And Burner
Carefully remove the logs (use care when han-
dling the fiber logs, as they become quite fragile
after curing). Vacuum out any foreign matter
(lint, carbon, etc.) on the burner. Ensure the
burner ports are “open.” Remove any carbon
deposits from the under side of the logs using
a vacuum cleaner, or a soft bristled brush (i.e.
paint brush). Note: Improper positioning of
logs can create carbon build-up and will alter
the performance of the appliance.
Replacing Logs -
If the logs become damaged by accident or
improper handling and need replacement, use
only the proper replacement logs from manufac-
turer (see Page 20 for ordering information).
Re-Install Embers, Logs and Vermiculite
- Carefully follow placement instructions on
Pages 7 to 9 ). All logs should fit onto cor-
responding pins and/or log stoppers. This will
ensure a proper flame and safe combustion.
Inspect Wiring
Refer to wiring diagrams on Page 11.
MAINTENANCE
(See Maintenance Schedule, Page 17)
Refertothemaintenancescheduleformaintenance
tasks, procedures, periodicity and by whom they
should be performed. Always verify proper opera-
tion of the appliance after servicing.
WARNING
Label all wires prior to discon-
nection when servicing con-
trols. Wiring errors can cause
improper and dangerous opera-
tion. Verify proper operation
after servicing.
Oncethe pilot is lit, if your electronic applianceis
equippedwith an optional burner controlswitch
kit the appliance main burner may be turned on
and off using the optional switch (See optional
accessories on Page 12 - Wall Switch, Wall
Thermostat Or Remote Control Receiver).

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
6
WARNING
Handle this glass with extreme
care! Tempered glassissuscep-
tible to damage – do not scratch
or handle roughly while rein-
stalling the glass door frame.
Inspect and clean all wire connections. Ensure
that there is no melting or damage. Inspection
should include:
• Terminals at the Valve
• OFF/ON Switch
• (Optional Control Switch) Wall Thermostat,
Remote Control or Remote Wall Switch Kit
Inspect Burner Flame Appearance
Ensure that the burner flame appearance
resembles the flame shown in Figure 13 and as
described in Flame Appearance and Sooting on
Page 9.The Homeowner must contact a quali-
fied service technician at once if any abnormal
condition is observed.
Small Area Paint Touch-up
The finish of the appliance is a high qual-
ity powdercoat. Only use factory supplied
powdercoat paint kit for touch-ups. Paint is
available at your local authorized Lennox Hearth
Productsdealer (cat. no. 90L74). Never attempt
to paint a hot fireplace.
Do not attempt to repaint the appliance until the
finish is completely cured (see Burn-In Period
on Page 3 ). If the surface later becomes stained
or marred, it may be lightly sanded and touched
up with spray paint.
Front Glass Enclosure Panel, Removal
and Installation
WARNING
Do not operate appliance withthe
glass front removed, cracked or
broken. Replacementoftheglass
should be done by a licensed or
qualified service technician.
WARNING
Do not attempt to substitute the
materials used on this door, or
replace cracked or broken glass
with any materials other than
those provided by the appliance
manufacturer.
WARNING
The glass door of this appli-
ance must only be replaced as a
complete unit as provided by the
manufacturer. Do not attempt to
replacebroken,crackedorchipped
glass separately.
WARNING
Do not attempt to touch the front
enclosure glass with your hands
while the fireplace is in use.
These are direct-vent appliances. They are
designed to operate only when the front glass
enclosure panel is installed. Generally the front
glass enclosure panel should not be removed
except to gain access to the components within
the firebox, and the appliance may only be oper-
ated without the front glass enclosure panel
in place for very brief periods of time during
appliance checkout and adjustment. Note: The
flame appearance will be diminished while the
front glass enclosure panel is removed.
During this appliance checkout and adjust-
ment period, a potential safety hazard exists
- EXERCISE EXTREME CAUTION to prevent
the occurrence of any burn injuries from the
exposed flames or hot surfaces. Also note, that
while the front glass enclosure panel (or any of
the panels) is removed, the flame appearance
will appear to be smaller than normal.
Figure 4 - INSTALLING GLASS DOOR
Lower Compartment
Door and Hinge
Top Flange on
Glass Door
Bottom Vee-flange
Glass Door
Glass Door Latch
Glass Door
Firebox Floor
Removing Glass Enclosure Panels
(see Figure 4)
1. Remove the top louver assembly or radiant
panel by pulling it out and off.
2. Open the control compartment access panel.
by actuating the spring-loaded magnetic
catchessecuring thepanel(gently depressthe
outer top corners of the louvered or radiant
panel until the catches "pop" the door free,
allowing it to swing out and down to the open
position).
3. Locate the two (2) latches at the top of the
control compartment. To disengage the two
latches from the bottom vee-flange of the
glass enclosure panel, reach for the handles
located towards the back of the latches and
pull the handles down toward the front of
the appliance.
4. Swing the bottom of the door out and raise
it slightly to lift the top flange of the door
frame away from the appliance.
Installing Glass Enclosure Panels
(see Figure 4 )
1. Visually inspect the gasket onthe backside of
the panels. The gasketsurface mustbe clean,
free of irregularities and seated firmly.
2. Position the glass enclosure panel in front of
the firebox opening at a 45 degree angle and
engage the top flange over the lip at the top
of the firebox opening. See Figure 4.
3. Swing the glass enclosure panel down and
back. Ensure the gasket seats evenly as the
panel draws shut. Engage the Vee-flange at
the bottom of the panel with the latches and
close the latches to secure the panel.
4. Close the bottom control compartment
access panel.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 7
WARNING
The size and position of the log
set was engineered to give the
appliance a safe, reliable and
attractive flame pattern. Any
attempt to use a different log
set in the fireplace will void
the warranty and will result in
incomplete combustion, soot-
ing, and poor flame quality.
LOG SET
Catalog Number H3210
* Item Description
A Log, Center
B Log, Left Rear
C Log, Left Front
D Log, Right Rear
E Log, Top Center
F Log, Front Center
* Item "letters" above correspond to photos on right
LOG SET - IDENTIFICATION
REFERENCE
Firebox Accessories / Parts
Cat. No. Model No. Description
88L53 FGE Bag of Glowing Embers
(1 oz. rockwool)
42363 Vermiculite, Bag (2 liters)
F
D
Bottom View of Logs (in packaging)
Top View of Logs
C
E
A
B
Glowing Embers
Bag of Glowing
Embers (rockwool)
Separate into Quarter
Size (separate) Pieces
Top View of Logs - Installed
E
B
C
F
A
D
F
E
A
C
B
D
Figure 5 (Valve Access Side)
INSTALL GRATE, VERMICULITE, GLOWING EMBERS AND LOGS

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
8
Position The Groove At The Bottom Of
Log (A) Over The Grate And Slide It
Forward Against The Grate Here
Figure 7
READ LOG WARNINGS ON PAGE 9 BEFORE PROCEEDING
1. Remove front glass enclosure panel from appliance.
a. Open Control Compartment Access Panel (see Control Compart-
ment Access Instructions on Page 4.).
b. Removethe glass panel enclosure (see Removing Glass Enclosure
Panel instructions on Page 6.
2. Remove the following from firebox; log set, embers (rockwool) and
vermiculite. Handle logs carefully to prevent breakage.
3. Ensure the Grate is properly installed in the firebox with the 4 legs
of the grate fitting into the 4 dimples on the firebox floor.
4. Install Vermiculite -Place some vermiculite on the firebox floor around
the grate (the entire bag of vermiculite will NOT be used). See Figure 13
on Page 9. DO NOT PLACE ANY VERMICULITE ON THE BURNER.
6. Placement of Glowing Embers -
Separate the Embers (rockwool) into pieces about the size of a quarter
(see Figure 5 on Page 7 ). Keep the pieces fluffed up, not matted.
Distribute these pieces over the surface of the burner, as shown in
Figure 6. Do not use more than is necessary. Ensure that the main
burner ports remain uncovered by the ember material.
Note: This appliance is provided with enough Glowing Embers for
several applications, do not use all that is in a new bag at one time. For
best glowing effect, replace the ember material annually. Replacement
Glowing Embers are available (order Catalog Number 88L53).
B
C
D
A
(Valve Access Side)
(Valve Access Side)
(Valve Access Side)
(Valve Access Side)
Position Groove At The Bottom Of
Log (A) Over The Log Support Here
8. Place Log (B) as shown in Figure 8.
Position Log (B) Against The Back Of
The Grate Here
Position Groove at The Bottom Of Log (B) Over The Grate
Here And Slide It Against The Back Of The Grate
Figure 8
Log (C) Lays Over Logs (A) and (B)
A
B
Position And Slide Log (D) Against The
Back Of The Grate
Place Log (D) Over The
Flat Spot On Log (A) Here
A
Position The Groove in The Back of Log (C)
Against The Grate
Figure 9
9. Place Log (C) as shown in Figure 9.
Figure 10
10. Place Log (D) as shown in Figure 10.
Figure 6
Place Embers on burner as shown.
DO NOT PLACE EMBERS OVER
GAS PORTS / AREAS CIRCLED
7. Place Log (A) on the grate as shown in Figure 7.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 9
Position round end of log (E) against the notch of
log (D) here. Two charred spots face the front
Figure 11
10. Place Log (E) as shown in Figure 11.
WARNING
DO NOT attempt to install the logs
untiltheapplianceinstallationhas
beencompleted,the gas line con-
nectedandtestedforleaksandthe
initial burner operation has been
checked out.
D
E
C
Position Small End of
Log (E) on The Notch of
Log (C) Here
(Valve Access Side)
11. Place Log (F) as shown in Figure 12.
(Valve Access Side)
F
Figure 12
Log (F) sits in front of the grate
WARNING
This appliance is not designed
to burn wood. Any attempt to
do so could cause irreparable
damage to appliance and prove
hazardous to your safety.
WARNING
If logs are not installed according
totheloginstallationinstructions,
flameimpingement andimproper
combustioncouldoccurandresult
in soot and/or excessive produc-
tion of carbon monoxide (CO), a
colorless, odorless, toxic gas.
WARNING
Logs get very hot and will remain hot up to one hour after gas supply is
turned off. Handle only when logs are cool. Turn off all electricity to the
appliance before you install grate and logs.
BURNER ADJUSTMENTS (QUALIFIED TECHNICIANS ONLY)
If the air shutter openings closed too far, sooting may develop. Sooting is indicated by black puffs
developing at the tips of very long orange flames. Sooting results in black deposits forming on the
logs, appliance inside surfaces and on exterior surfaces adjacent to the vent termination. Sooting is
caused by incomplete combustion in the flames and lack of combustion air entering the air shutter
opening. To achieve a warm yellowish-orange flame with an orange body that does not soot, the
shutter opening must be adjusted between these two extremes.
Air Shutter Adjustment Guidelines
• If there is smoke or soot present, first check the log set positioning to ensure that the flames are
not impinging on any of the logs. If the log set is properly positioned and a sooting condition
still exists, then the air shutter opening should be increased.
• The more offsets in the vent system, the larger the air shutter opening will need to be.
• An appliance operated with the air shutter opened too far, may have flames that appear blue
and transparent. These weak, blue and transparent flames are termed anemic.
• Propane models may exhibit flames which candle or appear stringy. If this is present and per-
sists, adjust the air shutter to a more closed position, then operate the appliance for a few more
minutes to ensure that the flame normalizes and the flames do not appear sooty.
Air Shutter Adjustment Guidelines:
Amount of
Primary Air
Flame
Color
Air Shutter
Adjustment
If air shutter is
closed too far
Flame will
be orange
Air shutter
gap should be
increased
If air shutter is
open too far
Flame will
be blue
Air shutter
gap should be
decreased
The following chart is provided to aid you in
achieving the correct air shutter adjustment
for your installation.
WARNING
Air shutter adjustment should
only be performed by a qualified
professional service technician.
WARNING
Ensure front glass panels are in
place and sealed during adjust-
ment.
CAUTION
The air shutter door and nearby
appliance surfaces are hot. Exer-
cise caution to avoid injury while
adjusting flame appearance.
CAUTION
Carbon will beproduced if the air
shutter is closed too much. Any
damagedue to carboning result-
ing from improperly setting the
air shutter is not covered under
the warranty.
Vermiculite
Figure 13 *- Burner Flame Appearance
Flame Appearance & Sooting
Proper flame appearance is a
flame which is blue at the base
andbecomesyellowish-orange in
the body of the flame. When the
applianceisfirstlit,theentireflame
maybeblueandwillgraduallyturn
yellowish-orange during the first
15 minutes of operation. If after
period the flame stays lowered
blue, or if the flame is orange with
evidenceofsooting(blacktip),the
air shutter opening may need to
be adjusted.
Burner Air Shutter Adjustment Procedure
1. Locate adjustment rod and adjust air shutter
to the standard setting as shown in Figure
14 (adjustment rod is located in the lower
control compartment). Note: Rotating the
adjustment rod counterclockwise decreases
air and clockwise increases air.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
10
2. Light appliance (follow lighting procedure on
lighting label in control compartment or see
homeowners manual).
3. Allowthe burner tooperatefor at least 15min-
utes while observing the flame continuously
to ensure that the proper flame appearance
has been achieved (see Figure 13 ). If the
following conditions are present, adjust
accordingly.
• If flame appears weak or sooty, adjust
the air shutter, incrementally, to a more
open position until the proper flame
appearance is achieved.
• If flame stays lowered blue, adjust the
air shutter, incrementally, to a more
closed position until the proper flame
appearance is achieved.
4. Leave the control knob (off/pilot/on) in the
ON position and the burner OFF/ON switch
OFF (& remote switches, if applicable).
5. When satisfied that the burner flame appear-
ance is normal, close the lower control
compartment door.
Adjustment Rod Positions
(when viewed from above)
Figure 14
Main Burner Factory Air Shutter
Opening Setting - All Models
Model Natural
Gas
Propane
Gas
MPD35ST
1/8”
3.2mm
1/4”
6.4mm
Increase Shutter Opening
In This Direction
Decrease Shutter Opening
In This Direction Note - Burners are
omitted in this
view for clarity.
Orifice
Air Shutter
Adjusting
Rod
Electronic Appliance Checkout
To light the burner, refer to the lighting instruc-
tions on Page 16. Ensure the igniter lights the
pilot. The pilot flame should engulf the flame
sensor as shown in Figure 16.
Figure 16
3/8" to 1/2"
(9 -13 mm)
Ground
Electrode
Flame Rod
Hot Surface
Igniter
Proper Flame
Adjustment
Pilot
Nozzels
Millivolt Appliance Checkout
The pilot flame should be steady, not lifting
or floating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (10 mm) at the pilot generator
(thermopile) and the top 1/8" minimum (tip)
of the quick drop out thermocouple should be
engulfed in the pilot flame. The flame should
project 1" (25 mm) beyond the hood at all three
ports. See Figure 15.
To light the burner, refer to the lighting instruc-
tions on Page 15.
ELECTRONIC PILOT ASSEMBLY
Proper Pilot Flame Appearance
Figure 15
Thermocouple
Thermopile
Pilot
Nozzels
MILLIVOLT PILOT ASSEMBLY
3/8" Min.
(9 mm)
Igniter Rod
Hood
Proper Pilot Flame Appearance
With proper care and maintenance, your appli-
ance will provide many years of enjoyment. If
you should experience any problem, first refer
to the troubleshooting guide in this manual.
If problem persists, contact your Lennox
distributor.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 11
WARRANTY
Your gas appliance is covered by a limited
twenty year warranty. You will find a copy
of the warranty accompanying this manual.
Please read the warranty to be familiar with
its coverage.
Retain this manual. File it with your other
documents for future reference.
REPLACEMENT PARTS
A complete parts list is found at the end of
this manual. Use only parts supplied from the
manufacturer.
Normally, all parts should be ordered through
your Lennox distributor or dealer. Parts will be
shipped at prevailing prices at time of order.
Ifyouencounteranyproblems or have any ques-
tions concerning the installation or application
of this system, please contact your distributor,
or Lennox directly:
LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, CA 92865
PRODUCT REFERENCE INFORMATION
We recommend that you record the following
important information about your fireplace.
Please contact your Lennox dealer for any
questions or concerns. For the number of
your nearest Lennox dealer, please call 800-
731-8101
Your Fireplace's Model Number ________________________________________
Your Fireplace's Serial Number ________________________________________
The Date On Which Your Fireplace Was Installed___________________________
The Type of Gas Your Fireplace Uses ____________________________________
Your Dealer's Name ________________________________________________
When ordering repair parts, always give the
following information:
1. The model number of the appliance.
2. The serial number of the appliance.
3. The part number.
4. The description of the part.
5. The quantity required.
6. The installation date of the appliance.
WIRING DIAGRAMS
Wiring diagrams are provided here for refer-
ence purposes only. This information is also
provided on schematics attached directly to the
appliance on a pullout panel located within the
control compartment.
TH
TP TH
TP
Thermopile
If any of the original wire as supplied must
be replaced, it must be replaced with Type
AWM105 C - 18 gage wire.
*OptionalKitsInstalled-OFF/ONwallswitch,
wall thermostat or remote control receiver.
Note: Turn the appliance-mounted OFF/ON
burner control switch to the OFF position if
any of these kits are installed.
Millivolt Wiring Diagram
Schematic Representation Only
Field Wired
Factory
Wired
*Opt.
Switch
Standard OFF/ON Switch
CAUTION
Label all wires prior to discon-
nection when servicing con-
trols. Wiring errors can cause
improper and dangerous appli-
ance operation.
Figure 17
Electronic Wiring Diagram (Honeywell) Showing Blower Wiring for Optional FBK-100, FBK-200 & FBK-250 Kits
Schematic Representation Only
G
BK
120
VAC
Relay Module C/W FBK-250 only. Plug blower
into J-Box receptacle for FBK-100 or FBK-200
application. View A for J-Box wiring.
Optional Blower
*OFF/ON Switch
(Integral with
Gas Valve)
Honeywell
Electronic
Gas
Valve
120 VAC
Primary
Secondary
Optional Control Switch
Junction
Box
Junction Box
Pilot Burner
Assembly
BL
BL
Wall Mounted Blower Speed Control Switch or
ON/OFF Switch for Blower Kit (optional)
Field Wired
Factory
Wired
BK = BLACK BL = BLUE
R = RED W = WHITE
G = GREEN
BK
W
BK
BK BL
R
GROUND
24 V
Transformer
Auxiliary View A
J-Box Wiring when
using unit mounted
relay module.
BK
W
G
C
AV
02
1
Igniter
Connector
W
GBK
R
* Leave the OFF/ON switch, which is
integral with the gas valve, in the ON
position.
** Optional Control Switches: Wall
Switch, Wall Thermostat or Remote
Control Receiver.
Notes:
1. If any of the original wire as supplied
must be replaced, use Type AWM 105°C
- 18 gage wire ONLY.
2. 120 VAC, 60 Hz - Less than 3 Amps.
Caution: label all wires prior to
disconnection when servicing controls.
Wiring errors can cause improper and
dangerous operation.
White Wire
to Opposite
Side (neutral)
Outlet Box Green
Ground Screw
Break off Tab
Hot side
of Outlet
Figure 18

Product Reference Information
Cat. No. Model Ship.
Weight
Ship.
Volumn
H3201 MPD35ST-NM 220 lbs 46W x 26D x
43H (30 cu.ft.)
H3202 MPD35ST-PM 220 lbs 46W x 26D x
43H (30 cu.ft.)
H3203 MPD35ST-NE 220 lbs 46W x 26D x
43H (30 cu.ft.)
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
12
Deluxe Remote Control System
The Model RCL-T (Deluxe) Remote Control System
has all of the features of the standard system along
withan added easyto read LCD screen which presents
access to many enhancements, including; battery
power level indicator, timer, mode of operation,
thermostatic display including room temperature in
either metric of English units, flame indicator and
clock. Fully programmable, the Model RCL-T allows
for virtual command over nearly all operational and
temperature variables, using the hand held remote
control transmitter.
The Model RCL-T (Deluxe) remote control system
is installed in the same manner as the standard
system, may be operated with electronic and mil-
livolt systems with either natural gas or propane gas.
The RCL-T comes complete with detailed operating
instructions.
ACCESSORY COMPONENTS
Standard Remote Control System
The Model RCL (Standard) Remote Control System,
features a simplistic OFF/ON control function for the
fireplace. This model includes ahand-held transmitter,
a remote receiver with wall-mount cover plate and
all hardware required to install the unit. The remote
receiver can be wall or hearth mounted.
The transmitter has ON and OFF functions that are
activated by pressing either button on the face of
the transmitter. When a button on the transmitter
is pressed, a signal light illuminates briefly to verify
that a signal has been sent.
The Model RCL is designed to operate with all mil-
livolt ignition systems, as well as electronic ignition
systems. It may be installed with use for either
natural gas or propane gas appliances. The RCL
offers ease of installation and allows you to execute
on-off commands to the fireplace effortlessly with
one simple motion.
The Model RCL comes complete with detailed operat-
ing instructions.
Remote Control Kit, Standard
Cat. No. Model No. Description
H0249 RCL Remote Control System
(Standard)
Remote Control Kit, Deluxe
Cat. No. Model No. Description
H0251 RCL-STAT Remote Control System
(Deluxe)
Wall Thermostat
The wall thermostat kit provides temperature control
for optimum comfort.
Wall Thermostat, Millivolt
Cat. No. Model No. Description
89L36 WTK Wall Thermostat Kit,
White
OFF/ON Wall Switch Kit
The OFF/ON wall switch kit may be used to control
the operation of the fireplace burner. Install the
OFF/ON wall switch in a convenient location near
the fireplace.
White Wall Switch Kit
Cat. No. Model No. Description
85L87 FWSK OFF/ON Wall Switch Kit
Bag of Glowing Embers
Bag of Volcanic Stone
Replacement ember materials or volcanic stone are
available for use with these appliances. Order kits as
part of the periodic maintenance of the appliance.
Decorative Firebox Accessories
Cat. No. Model No. Description
88L53 FGE Bag of Glowing Embers
(1 oz. rockwool)
80L42 FDVS Bag of Decorative
Volcanic Stone
(ref. Form # 750,127M) (ref. Form # 750,129M)
(FDVS ref. Form #750,010M)
    

  

Brickaded Wall Liner Kits
Cat. No. Model No. Description
H3207 MBLK-35ST Interior Brick Liner Kit
Brickaded Panel Liner Kit
The brickaded liner kits include ceramic panels as
shown here. The panels have brick-like features
in relief.
(ref. Form # 750,160M)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Arch Design Kits
Cat. No. Model Description
H0858 AD35C 35” Arch Doors, Charcoal
H0859 AD35TI 35” Arch Doors, Textured Iron
H0860 AD35SP 35” Arch Doors, Satin Pewter
H0861 AD35AB 35” Arch Doors, Antique Brass
Arch Pane Design Kits
H0930 APD35C 35” Arch Pane Doors, Char.
H0931 APD35TI 35” Arch Pane Doors, Text. Iron
H0932 APD35SP 35” Arch Pane Doors, Satin Pew.
H0933 APD35AB 35” Arch Pane Doors, Ant. Brass
Square Design Kits
Cat. No. Model Description
H0946 SD35C 35” Sq. Doors, Charcoal
H0947 SD35TI 35” Sq. Doors, Textured Iron
H0948 SD35SP 35” Sq. Doors, Satin Pewter
H0949 SD35AB 35” Sq. Doors, Antique Brass
Square Pane Design Kits
H0962 SPD35C 35” Sq. Pane Doors, Char.
H0963 SPD35TI 35” Sq. Pane Doors, Text. Iron
H0964 SPD35SP 35” Sq. Pane Doors, Satin Pew.
H0965 SPD35AB 35” Sq. Pane Doors, Ant. Brass
Style View Doors -
Style View Doors come in 4 beautiful styles. They
are easy to install and will not require hardware to
attach them to the standard glass door frame. The
door includes heavy duty magnet door latches and
functional twin-pane doors.
13
Arch
Design
Arch Pane
Design
Square
Pane
Design
Square
Design 2-Piece Polished Brass and Brushed Stainless
Louvers Kits
These louvers are designedto replace eitherthe middle
charcoal louver of each set or the charcoal louver in
each set closest to the glass door. These kits include
two narrow louvers. They provide a touch of elegance
to these appliances. These kits can be retrofitted to
previously installed appliances.
2-Piece Louver Kits
Cat. No. Model No. Description
96L05 2LVR35PB 2 Pc. Louver Kit,
Polished Brass
96L09 2LVR35BS 2 Pc. Louver Kit,
Brushed Stainless
Clean Face Charcoal Radiant Panel Kits
Cat. No. Model No. Description
88L36 RAD35C-2 Clean Face Panel Kit
Clean Face Panel Kits
Cleanfaced panel kitsare available to convert the stan-
dard louvered fireplaces to radiant models which are
more suited for finishing around the firebox opening
with non-combustible materials, such as tile.
ACCESSORY COMPONENTS
(ref. Form # 775,169M)
(ref. Form # 504,224M)
(ref. Form # 504,223M)
Polished Brass & Brushed Stainless Louvers Kits
Decorative louvers are available for use with all
Multi-Open Series appliances.These kits include a
top 3-piece assembly and a bottom 3-piece assembly.
They provide a touch of elegance to any Multi-Open
Series appliance. These kits can be retrofitted to
previously installed appliances.
35" Assembled Louver Kits
Cat. No. Model No. Description
88L28 LVR35PB-2 Louver Kit, Polished
Brass
88L32 LVR35BS-2 Louver Kit, Brushed
Stainless
These kits are designed
to attach directly to
the front face of the
appliance at the glass
enclosure panel’s top
and bottom edges.
3 Piece Trim Kit
Cat. No. Model No. Description
96K21 TK35PB3 35” 3 Piece Finish Trim Kit,
Polished Brass
2 Piece Trim Kit
Cat. No. Model No. Description
26M88 2DFK35PB 35” Door Trim Kit, Polished
Brass (2 Piece, Top and
Bottom)
26M91 2DFK35BS 35” Door Trim Kit, Brushed
Stainless (2 Piece, Top and
Bottom)
(ref. Form # 750,119M)
(ref. Form # 750,098M)
(ref. Form # 750,147M)
4 Piece Trim Kit
Cat. No. Model No. Description
96K17 TK35PB4 35” 4 Piece Finish Trim Kit,
Polished Brass
Polished Brass 3-Piece Trim Kit
This kit contains brass trim pieces used to finish the
gaps between the wall board and the fireplace, provid-
ing the appliance a brass perimeter highlight. This kit
contains the trim pieces and these instructions.
(ref. Form # ii-9299)
2-Piece Door Frame Kits
Note: Door & Trim Kits are for 1 side only. If set is desired, order 2 kits.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
14
Polished Brass & Brushed Stainless Hood Kits
Attractive hoods are available in two styles to be used
on the Multi-Open Series appliances. These hoods
are designed to be fitted to the glass viewing sides of
the appliance. In addition to providing an aesthetically
pleasing appearance to your appliance installation,
the hood reduces heat effects to decorative mantles
and finish materials located above the fireplace
opening. The hood kit replaces the standard hood
that comes with these appliances and snaps into
place. These kits can be retrofitted to previously
installed appliances.
ACCESSORY COMPONENTS
* 35" Eyebrow Hood Kits
Cat. No. Model No. Description
96K67 EB35PB Hood Kit, Polished
Brass
88L49 EB35BS Hood Kit, Brushed
Stainless
* These hood kits replace the standard hood that
comes with these fireplaces.
Door Frame Kits
A decorative door frame kit is available for use with
these appliances. It is designed to attach directly to
the front face of the appliance at the four edges of
the glass enclosure panel resulting in the appearance
of a picture frame.
4 Piece Door Trim Kits
Cat. No. Model No. Description
26M82 4DFK35PB Door Trim, Polished Brass
26M85 4DFK35BS Door Trim, Brushed Stainless
(ref. Form # 750,098M)
(ref. Form #504,142M)
Forced Air Kit
The FBK-100 blower provides constant velocityforced
air circulation. The FBK-200 assembly with variable
speed, wall-mountable switch provides variablespeed
forced air circulation. The FBK-250 assembly with
variable speed unit-mountable switch, also provides
variable speed forced air circulation.
Forced Air Blower Kits
Cat.
No.
Model No. Description
80L84 FBK-100 Blower, Standard
(single speed)
80L85 FBK-200 Blower, Variable Speed
(w/wall-mounted switch)
80L86 FBK-250 Blower, Variable Speed
(w/unit-mounted switch)
94L89 FBK-100-36 Blower, Standard, 36 Pack
94L90 FBK-200-36 Blower Kit - Variable Speed
with Wall Switch 36 Pack
H0543 FBK-250-36 Blower Kit - Variable Speed
with Thermo Snap Switch
36 Pack
Screen Heat Guard Kit
This easy to install optional screen heat guard installs
over the standard glass enclosure panel to provide
protection from the hot glass surface. These screen
heat guard panels cannot be used in conjunction
with the arch door kits or door frame kits. Order 2
if a set is desired (for front face and rear face glass
surfaces).
* 35" Screen Heat Guard Kit
Cat. No. Model No. Description
26M48 HG35M 35" Screen Heat Guard Kit
* Order 2 for set if desired.
(ref. Form # 750,028M & 750,029M)
(ref. Form # 750,101M)
Arch Door Kits
Two types of arch door kits are available for the Multi-
Open Series. Both types of kits are easy to install
and do not require hardware to attach them to the
standard door frame. These kits can be retrofitted to
previously installed Multi-Open Seriesappliances. The
decorative arch kits can not be used in conjunction
with the screen panel kit.
* 35" Arch Door Kits
Cat. No. Model No. Description
26M43 ADK35CMPB Arch Door, Polished Brass
26M44 ADK35CMBS Arch Door, Brushed Stainless
* Order 2 for set if desired.
(ref. Form # 750,021M)
Touch-Up Paint Kit
Repair of minor scratches and discoloration of the
appliance charcoal painted surfaces may be accom-
plished with the touch-up paint kit.
Touch-Up Paint Kits
Cat. No. Model No. Description
90L74 TPK-C Touch-Up Paint (Charcoal)
98K67 TPK-T Touch-Up Paint (Tan)
(TPK-C ref. Form # 504,216M)
P
A
I
N
T

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 15
6. Wait five (5) minutes to clear out any gas. If you then smell gas,
STOP! Follow “B” in the safety information above on this page. If you
do not smell gas, go to the next step.
7. Push in gas control knob slightly and turn counterclockwise
to “PILOT.”
8. Push in control knob all the way and hold in. Immediately light the
pilot by triggering the spark igniter (pushing the button) until pilot
lights. Continue to hold the control knob in for about 1 1/2 minutes
after the pilot is lit. Release knob and it will pop back up. Pilot should
remain lit. If it goes out, repeat steps 5 through 8.
•If knob does not pop up when released, stop
and immediately call your service technician
or gas supplier.
•If pilot will not stay lit after several tries,
turn the control knob to “OFF” and call
your service technician or gas supplier.
9. Turn gas control knob counterclockwise
to “ON.”
10. Close lower control compartment.
LIGHTING INSTRUCTIONS – MILLIVOLT GAS VALVE
WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION
MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
FOR YOUR SAFETY READ BEFORE LIGHTING
A. This appliance has a pilot which must be lit with a piezo
igniter. When lighting the pilot, follow these instructions
exactly.
B. BEFORE OPERATING smell all around the appliance area for
gas. Ensure 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
•Extinguish any open flame.
•Open windows.
•Do not light any appliance.
•Do not touch any electrical switches.
TO TURN OFF GAS TO APPLIANCE
1. Turn remote wall switch “OFF.” The pilot will remain lit for
normal service.
2. For complete shutdown, turn remote wall switch to “OFF.”
3. Access the lower control compartment.
4. Depress gas control knob slightly and turn clockwise
to “OFF.” Do not force.
5. Close lower control compartment.
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above on this page.
2. Access the lower control compartment.
3. Turn OFF/ON switch to “OFF” (and remote wall switch, if appli-
cable).
4. Verify main line shut-off valve is open.
5. Push in gas control knob slightly and turn clockwise
to “OFF.”
•Do not use any phone in your building.
•Immediately call your gas supplier from a neighbor’s
phone.
•If your gas supplier cannot be reached, call the fire depart-
ment.
C. Use only your hand to push in or turn the gas control knob.
Never use tools. If the knob will not push in or turn by hand,
do not try to repair it, call a qualified service technician. Force
or attempted repair may result in a fire or an explosion.
D. Do not use this appliance 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.
Note: Knob cannot be turned from “PILOT” to “OFF”
unless the knob is pushed in slightly. Do not force.
Millivolt Pilot
H
I
L
O
W
TPTH TP TH
P
I
L
O
T
P
I
L
O
T
O
N
it
it
O
F
F
OUT
OUT
IN
IN
SIT Millivolt Gas Valve
- LO / HI + GAS CONTROL
KNOB
TP/TH
TH
TP
PIEZO
IGNITER
BURNER
OFF/ON SWITCH
OFF
ON

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
16
WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION
MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
A. When lighting the appliance, follow these instructions
exactly.
B. BEFORE OPERATING smell all 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
•Extinguish any open flame.
•Open windows.
•Do not light any appliance.
•Do not touch any electrical switches.
•Do not use any phone in your building.
FOR YOUR SAFETY READ BEFORE LIGHTING
•Immediately call your gas supplier from a neighbor’s
phone.
•If your gas supplier cannot be reached, call the fire
department.
C. Use only your hand to turn the gas control lever. Never
use tools. If the lever will not turn by hand, do not try
to repair it, call a qualified service technician. Force or
attempted repair may result in a fire or an explosion.
D. Do not use this appliance 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.
LIGHTING INSTRUCTIONS — ELECTRONIC
1. For complete shut-down, turn remote wall switch to
“OFF.”
2. Open lower control compartment door.
3. Turn the OFF/ON switch to “OFF”. Do not force.
4. Close the main line shut-off valve.
5. Close lower control compartment door.
TO TURN OFF GAS TO APPLIANCE
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above on this page.
2. Turn remote wall switch to “OFF.”
3. Open lower control compartment door.
4. Verify main line shut-off valve is open.
5. Turn the OFF/ON switch to “OFF”. Do not force.
6. Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Follow “B” in the safety information
above on this page. If you do not smell gas, go to the
next step.
7. Turn the OFF/ON switch to “ON”. Do not force.
8. Turn “ON” all electrical power to appliance (remote wall
or appliance switch).
9. Close lower control compartment door.
TO SHUT OFF
1. Turn off all electrical power to the appliance (remote wall
switch).
FFO
NI
PSI
NO
L
O
R
T
N
O
C
G
INT
IER
Honeywell Electronic Gas Control Valve
ON / OFF Switch
Front View

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 17
MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE
Inspecting/Cleaning Burner, Logs
and Controls
Qualified Service Technician Inspect valve and ensure it is properly operating. Check piping
for leaks. Vacuum the control compartment, fireplace logs and
burner area.
Check Flame Patterns and Flame
Height
Qualified Service Technician Refer to Figure 13 on Page 9 and verify the flame pattern and
height displayed by the applianceconforms to the picture. Flames
must not impinge on the logs. Ensure flames are steady (not
lifting or floating).
Inspecting/Cleaning Pilot and Burner Qualified Service Technician Refer to Figure 15 and Figure 16 on Page 10. Remove any
surface build-up on pilot and burner assembly. Wipe the pilot
nozzles, igniter/flame rod and hood. Ensure the pilot flame
engulfs the flame sensor as shown.
Checking Vent System Qualified Service Technician Inspect the vent system at the top and at the base (within the
firebox) for signs of blockage or obstruction. Look for any signs
of dislocation or deterioration of the vent components. Note:
Excessive condensation can cause corrosion of caps, pipe &
fittings (excessive condensation can be caused by long lateral
runs, too many elbows and/or exterior portions of the system
being exposed to cold weather). Also inspect wall straps or
plumbers's tape to ensure it is secure and in place.
Appliance Checkout Qualified Service Technician Perform the appropriate appliance checkout procedure detailed
in this manual.
Replacing Rockwool Ember Materials Homeowner/Qualified Service
Technician
Remove old ember materials (rockwool) and vacuum the ember
placement area. Place new embers as described in Step 6 on
Page 8.
Periodically (After the Burning Season)
MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE
Cleaning Firebox Interior Homeowner Carefully remove logs, rockwool, volcanic stone and vermiculite.
Vacuum out interior of the firebox. Clean firebox walls and log
grate. Replace logs, Rockwool and volcanic stone as detailed
in this manual.
Check Flame Patterns and Flame
Height
Homeowner Refer to Figure 13 on Page 9 and verify the flame pattern and
heightdisplayed by the appliance conforms to thepicture. Flames
must not impinge on the logs.
Checking Vent System Homeowner Inspect the vent system at the top and at the base (within the
firebox) for signs of blockage or obstruction. Look for any signs
of dislocation of the vent components.
Cleaning Front Glass Enclosure Panel Homeowner Clean as necessary following the directions provided in this
manual. DO NOT TOUCH OR ATTEMPT TO CLEAN GLASS
WHILE HOT.
Annually (Before the onset of the Burning Season)
MAINTENANCE SCHEDULE

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
18
TROUBLESHOOTING GUIDE - MILLIVOLT GAS CONTROL SYSTEM
Note: Before troubleshooting the gas control system, Ensure external gas shut off valve, located at gas supply inlet, (and wall switch, iff applicable), is
in the “ON” position.
Important: Valve system troubleshooting should only be accomplished by a qualified service technician.
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
1. Spark igniter will not light pilot after
repeated triggering of igniter button.
A. Defective igniter
(no spark at electrode).
Check for spark at electrode and pilot; if no spark and
electrode wire is properly connected, replace igniter.
B. Defective or misaligned electrode at pilot
(spark at electrode).
Using a match, light pilot. If pilot lights, turn off pilot
and trigger the igniter button again. If pilot lights, an
improper gas mixture caused the bad lighting and
a longer purge period is recommended. If pilot will
not light – check gap at electrode and pilot – should
be 1/8" to have a strong spark. If gap measures 1/8",
replace pilot (see Figure 15 on Page 10).
C. Gas supply pressure errant. Check inlet gas pressure. It should be within the limits
as marked on the rating plate.
D. Pilot orifice plugged. Clean or replace pilot orifice.
2. Pilot will not stay lit after
carefully following the lighting
instructions.
A. Defective pilot generator
(thermocouple).
Check pilot flame, it must impinge on thermocouple
(see Figure 15 on Page 10). Clean and/or adjust pilot
for maximum flame impingement on thermocouple.
Ensure that the connection between the valve and
thermocouple are tight and secure.
3. Pilot burning, no gas to burner, Valve
knob “ON,” and the (standard) burner
OFF/ON switch is “ON." Read impor-
tant note below.
IMPORTANT NOTE: If an optional
*remote switch is used for burner
operation, if the standard burner
OFF/ON switch is still installed on
appliance it must be in the "OFF"
position.
*Optional remote switch kits - wall
switch, wall thermostat or remote
control.
A. Wall switch or wires defective. Check wall switch and wires for proper connections.
Jumper wire across terminals at wall switch, if burner
comes on, replace defectivewall switch. If okay, jumper
wires across wall switch wiresat valve, if burner comes
on, wires are faulty or connections are bad.
B. Thermopile may not be generating suf-
ficient millivolts.
Check thermopile with millivolt meter. Take reading
at thermopile terminals of gas valve. Should read
325 millivolts minimum with optional wall switch
“OFF.” Replace faulty thermopile if reading is below
specified minimum.
C. Plugged burner orifice. Check burner orifice for blockage and remove.
D. OFF/ON Switch & *Remote Switch are in
the "ON" position resulting in excessive
resistance.
When turning on the burner using a *remote switch,
ensure that the standard OFF/ON switch is in the "OFF"
position. If both switches are in the ON position, it
may result in excessive resistance (& millivolt drain-
age) and the burner may not come on.
4. Frequent pilot/burner outage prob-
lem.
A. Pilot flame may be too low or blowing (high)
causing the pilot/valve safety to drop out.
Clean and/or adjust pilot flame for maximum flame
impingement on thermocouple (see Figure 15 on
Page 10).
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
1. Burner will not light. A. Faulty Valve System. See Below.
B. “OFF/ON” or wall switch defective. Disconnect the two black wires from the wire nuts.
Test switch(s) for continuity with a multimeter. If
continuity is not indicated, switch(s) is defective and
must be replaced.
Note: Before replacing “OFF/ON” switch, Ensure to
check wiring for loose connections or broken wires
and repair as needed.
2. Burners come “ON,” then turns “OFF.” A. Burner orifice plugged. Check main burner orifice(s) for blockage. Clean
or replace.
B. Obstructed vent system. Check vent system for obstructions.
TROUBLESHOOTING
TROUBLESHOOTING GUIDE - ELECTRONIC IGNITION SYSTEM

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 19
START CHECK
• Turn Off Gas Supply.
• Ensure Valve Switch Is In ON Position.
• Disconnect Control Harness.
• Set Thermostat To Call For Heat.
• Check for proper volt-
age at control harness
(see insert A). Voltage
should be 24V between
thermostat or pressure
switch and 24V common
and 24V hot.
NO
• Line voltage power
• Low voltage transformer
• Limit controller
• Thermostat
• Wiring
YES
• Plug control harness into
valve. Wait for internal check
delay.
• Igniter warms up and glows
red.
NO
• With pilot burner cable con-
nected, measure voltage at
valve HSI element output. 24V
nominal. (See insert B)
NO • Replace valve.
YES
YES • Replace igniter/flame rod
assembly.
YES
• Turn on gas supply.
• Pilot burner lights.
NO
• Check that pilot gas is flowing. Wait
to ensure pilot gas tubing is purged.
Recycle call for heat if necessary.
NO • Replace valve.
YES
YES
• Measure voltage between 24V hot and
24V common leads to valve control.
Must measure at least 19.5 VAC with
igniter powered (see insert A). To
identify proper lead, this check must
be done with the valve control con-
nected and igniter powered.
NO
• Check transformer and
line volt supply.
YES
• Replace Pilot Assembly.
• Main valve opens and main
burner lights.
NO
• Check that pilot flame makes good
contact with pilot burner flame rod.
• Check for good electrical connection
through the pilot tubing.
• If both of the above are good, replace
igniter/flame rod assembly.
YES YES
• System Is okay. • Cycle thermostat off and back on.
Igniter will cycle off and
back on once during the 90
second ignition trial. All
voltage measurements must
be taken while the igniter is
powered.
When measuring voltage
at connections, use care
to ensure terminals are
not damaged.
• Main burner lights.
NO
• Replace valve.
Insert A
End View of Control Harness Connector
24 Volt
Common
24 Volt Hot
24 Volt
Switched
Check For Damaged or Missing
Terminals in Connector
Insert B
Igniter Terminals
1
2
2
1
2
1
TROUBLESHOOTING PROCEDURE - ELECTRONIC IGNITION SYSTEM

Printed in U.S.A. © 2005 by LENNOX HEARTH PRODUCTS
P/N 875,025M REV. NC 04/2005
LENNOX reserves the right to make changes at any time, without notice, in design,
materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
1110 West Taft Avenue • Orange, CA 92865
Item Part/Cat.No. Qty Description Where Used
SIT Millivolt Only
1 H3357 1 Gas Train Assembly, NG, MV MPD35ST-NM
1 H3355 1 Gas Train Assembly, LP, MV MPD35ST-PM
Honeywell Electronic Only
2 H3356 1 Gas Train Assembly, NG, Elecrtr. MPD35ST-NE
3 42J32 1 Transformer MPD35ST-NE &
MPD35ST-PE
Misc. Replacement Parts
4
H3351
2
Brickaded Side Panels All
5
H3352
1
Burner, Pan All
6
H3353
1
* Electrical kit All
7
LB-91941BY
2
Eyebrow Panel All
8 93L32 1 Flex Line Gas Connector, FFGC All
9
LB-92398B
2 Glass Enclosure Assembly All
10 42363 Vermiculite, Bag of All
11 H3358 1 Grate Assembly All
12 69L2101 4 Latch, Glass Enclosure Panel All
13
H3354
1
Firebox Sub-Floor All
Item Part/Cat. Qty Description Where Used
Misc. Replacement Parts
14
H3210 1 Log Set All
15 LB-92449B 2 Louver Assembly, Upper
Charcoal All
16 LB-92652B 1 Louver Assembly, Lower,
Charcoal (valve access side) All
17 H3359 1 Louver Assembly, Lower, Char. All
18 69L3101 2 Magnet, Latch, Spring-Loaded All
19 94326 2 Magnet All
20 LB-95668 8 Nailing Flange
All
21 12L15 2 Nameplate, Lennox All
22
24M1001
1 Orifice, Burner, NG, #37 (.104") MPD35ST-NM &
MPD35ST-NE
22
42M79
1 Orifice, Burner, LP, 1.55mm
(.061")
MPD35ST-PM &
MPD35ST-PE
23 111061 1 Piezo Igniter MPD35ST-NM &
MPD35ST-PM
24 27K30 1 OFF/ON Switch, Rocker All
25 H3363 Vent Restrictor All
10 42363 1 Vermiculite, 1 Bag All
14
REPLACEMENT PARTS - MPD35ST
Note: Ordering information for Volcanic Stone, Glowing Embers and Touch-up Paint can be found on
Page 12
11
5
3
4
25
6
20
16
21
9
15
8
17
9
15
7
10
12 18 19
13
8
2
22
24
1
8
23
22
20
* Electrical Outlet Kit consists of a junction box, 2 screws, an receptacle outlet, an OFF/ON rocker switch
and a snap bushing. Note: All the components in the electrical kit will Not be used by every model.
Complete Log Set Available Only