HOMEOWNER'S CARE AND
OPERATION INSTRUCTIONS
DIRECT VENT SEE-THROUGH
MERIT® PLUS SERIES
DIRECT-VENT GAS FIREPLACE HEATERS
P/N 875,025M REV. NC 04/2005
MODELS
Millivolt Models
Electronic Models
MPD35ST-NM
MPD35ST-PM
MPD35ST-NE
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING: IFTHEINFORMATIONINTHISMANUAL
IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLO-
SIONMAYRESULTCAUSINGPROPERTYDAMAGE,
PERSONAL INJURY OR LOSS OF LIFE.
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
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.
Listing Agency
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
OTL Report No. 116-F-28-5
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Burn-in Period
Manifold Gas Supply Pressure
(electronic models)
WARNING
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.
Fuel #
Fixed
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.
3.5" WC
(.87 kPa)
Natural Gas
Depending on your use, the burn-in period may
take a few hours or a few days.
10.0" WC
(2.49 kPa)
Propane
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.
Table 5
Test gauge connections are provided on the
frontofthemillivoltgascontrolvalve,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 ).
If an optional blower is installed, Do not turn it
on during the Burn-In period.
WARNING
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
thefirsttwoweeksofusetopreventthefilmfrom
baking on (making it very difficult to remove).
See Cleaning Glass on Page 5.
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.
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).
WARNING
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).
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.
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.
Orifice Sizes - Sea Level to High Altitude
(All Models)
These appliances are tested and approved for
installationsatelevationsof0-4500feet(0-1372
meters)abovesealevelusingthestandardburner
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
yourlocalgassupplierforderationrequirements
for your area.
WARNING
Failuretocomplywiththeinstal-
lationandoperatinginstructions
provided in this document will
result in an improperly installed
andoperatingappliance,voiding
its warranty. Any change to this
appliance and/or its operating
controlsisdangerous. Improper
installation or use of this appli-
ance can cause serious injury or
deathfromfire,burns,explosion
or carbon monoxide poisoning.
WARNING
These fireplaces are vented
heaters. Do not burn wood or
other material in these appli-
ances.
Deration - At higher elevations, the amount of
BTU fuel value delivered must be reduced by
eitherusinggasthathasbeenderatedbythegas
company or by changing the burner orifice to a
smallersizeasregulatedbythelocalauthorities
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.
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.
Burner Orifice Sizes (all models)
IMPORTANT
Natural
Gas
Propane
Gas
Elevation
These appliances must not be
connected to a chimney or flue
serving a separate solid fuel
burning appliance.
Feet (meters)
drill size (inches) drill size (inches)
0-4500
(0-1372)
#37 (.104")
24M1001 •
1.55 mm (.061")
*
*
42M7901 •
WARNING
Do not place clothing or other
flammable materials on or near
this appliance.
* Standard size installed at factory
• Part /Cat. Number
Table 6
3
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WARNING
Note:The gas supply
line must be installed
in accordance with
building codes by a
qualified installer
approved and/or
Carbon monoxide poisoning:
early signs of carbon monoxide
poisoning are similar to the flu
withheadaches,dizzinessand/or
nausea. If you have these signs,
obtainfreshairimmediately.Turn
offthegassupplytotheappliance
and have it serviced by a quali-
fied professional, as it may not
be operating correctly.
licensed as requed
by the locality. In
the Commonwealth
of Massachusetts,
installation must
be performed
by a licensed
plumber or gas
fitter.
OFF/PILOT/ON (gas control knob)
HI/LO (flame height
control knob)
Gas Flex Line
OFF/ON Switch
Hinge Pin
Gas Valve
Piezo Igniter
Compartment Access panel
Control
WARNING
Figure 1 - Gas Control Compartment Access
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.
OPERATION AND CARE OF YOUR
APPLIANCE
SIT Millivolt Gas Valve
HI/LO Variable
Inlet Pressure Tap
Flame Height
Adjustment
The standard controls for appliance operation
are located behind the hinged drop-down panel
belowtheappliancefrontglassenclosurepanel
(see Figure 1). Optional control switches are
also available (see Page 12 - Remote Wall
Switch, Remote Control or Wall Thermostat).
Manifold Pressure Tap
O U T I N
I
H
O
F
P
I
L
O
L
O
W
T
O
N
Operation of millivolt and electronic gas con-
trol systems are different. Before lighting and
operatingyourappliancedetermineifyouhave
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.
P
I
L
T
Note: An Optional Screen Heat
Guard for the glass is available
(see Page 14 for ordering infor-
mation).
Main Gas
Control Knob
OFF/PILOT/ON
Pilot Adjustment
Screw
Gas
Inlet
Millivolt Appliances - Appliances with
Millivolt systems will be fitted with the gas
control valve shown in Figure 2.
WARNING
Any safety guard or screen
removed for servicing the appli-
ance must be replaced prior to
operating the appliance.
Electronic Appliances - Appliances with
electronic systems will be fitted with the
electronic valve shown in Figure 3.
T
P
T
H
T
P
T
H
Gas
Outlet
Millivolt Appliances -
To light millivolt appliances refer to the detailed
lightinginstructionsfoundonPage15.Millivolt
appliance lighting instructions may also be
foundonthepulloutlightinginstructionlabels
attached to the gas control valve.
Main Gas
HI/LO Variable
Flame Height
Adjustment
Gas Control Compartment Access
Terminals
Control Knob
OFF/PILOT/ON
TPTH,TP & TH
Thegascontrolscanbefoundbehindthecontrol
compartment access panel.
IGNITER
OFF/ON
(burner)
Toopenthecontrolcompartmentaccesspanel,
actuate the spring-loaded magnetic catches
securing the panel. First, depress the outer top
right corner of the panel until the catch "pops"
thedoorfree.Then,gentlypullthedoorforward
until the left top corner "pops" free, allowing the
panel to swing out and down to open.
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
rockerswitchwillcontroltheapplianceOFF/ON
burneroperation. Tooperate: Toggletheswitch
between its ON and OFF positions.
Note: The piezo igniter and burner
OFF/ON switch are located below
glass panel (see Figure 1).
Figure 2
Note:Topreventexcessiveresistanceinburner
circuit(whichcancauseburneroperationprob-
lems),onlyoneburnercontrolswitchshouldbe
wired to valve. Therefore, if an optional control
switch is installed, the standard Off/On switch
and wires should be removed.
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.
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
anoptionalremoteswitch,turnoffthestandard
OFF/ON switch.
Electronic Appliances -
Tolightelectronicappliancesrefertothedetailed
lighting instructions found on Page 16. Elec-
tronicappliancelightinginstructionsmayalsobe
found on the pull out lighting instruction labels
attached to the gas control valve.
To ease door closure, depress the catches to
place them in their retracted position, then
close the door.
4
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Oncethepilotislit,ifyourelectronicapplianceis
equippedwithanoptionalburnercontrolswitch
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).
WARNING
Turnoffgasandelectricalpower
before servicing the appliance.
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, dustandotherairborneparticlestocling
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.
CAUTION
Wearglovesandsafety Glasses
for protection while doing
required maintenance.
Honeywell Electronic Gas Valve
Manifold Pressure ON / OFF Switch
Port
Inlet
Pressure
Port
IMPORTANT
• 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
Always verify proper operation
after servicing.
Electronic Gas
Figure 3
Control Valve
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.
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
appliancebyrotatingthevariableadjustment
control knob (HI/LO) located on the front of
the valve (refer to Figure 2 ).
Inspect Venting System
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.
The appliance and venting system should be
thoroughly inspected before initial use and at
least annually by a qualified service technician
(inspectionshouldincludeensuringthatexhaust
or intake passages are unobstructed and vent
components are properly assembled and not
damaged).Iftheventingsystemisdisassembled
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 Logs And Burner
Carefully remove the logs (use care when han-
dlingthefiberlogs,astheybecomequitefragile
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.
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. Morefrequentcleaningmayberequired
duetoexcessivelintfromcarpeting,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-
ousburningpilotflame. Exercisecautionwhen
using products with combustible vapors.
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.
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.
Cleaning Glass
Inspect Wiring
Refer to wiring diagrams on Page 11.
(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.
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.
MAINTENANCE
(See Maintenance Schedule, Page 17)
Refertothemaintenancescheduleformaintenance
tasks, procedures, periodicity and by whom they
shouldbeperformed. Alwaysverifyproperopera-
tion of the appliance after servicing.
The viewing glass should be cleaned periodi-
cally to remove any build-up caused from the
following:
5
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Removing Glass Enclosure Panels
Inspect and clean all wire connections. Ensure
that there is no melting or damage. Inspection
should include:
(see Figure 4)
WARNING
Do not attempt to touch the front
enclosure glass with your hands
while the fireplace is in use.
1. Remove the top louver assembly or radiant
panel by pulling it out and off.
• Terminals at the Valve
• OFF/ON Switch
• (Optional Control Switch) Wall Thermostat,
Remote Control or Remote Wall Switch Kit
2. Openthecontrolcompartmentaccesspanel.
by actuating the spring-loaded magnetic
catchessecuringthepanel(gentlydepressthe
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).
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.
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.
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.
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
availableatyourlocalauthorizedLennoxHearth
Productsdealer(cat.no.90L74). Neverattempt
to paint a hot fireplace.
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.
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.
Do not attempt to repaint the appliance until the
finish is completely cured (see Burn-In Period
onPage3).Ifthesurfacelaterbecomesstained
ormarred, itmaybelightlysandedandtouched
up with spray paint.
Installing Glass Enclosure Panels
(see Figure 4 )
Front Glass Enclosure Panel, Removal
and Installation
1. Visuallyinspectthegasketonthebacksideof
thepanels.Thegasketsurfacemustbeclean,
free of irregularities and seated firmly.
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
exposedflamesorhotsurfaces. Alsonote, that
while the front glass enclosure panel (or any of
the panels) is removed, the flame appearance
will appear to be smaller than normal.
WARNING
2.Positiontheglassenclosurepanelinfrontof
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.
Donotoperateappliancewiththe
glass front removed, cracked or
broken. Replacementoftheglass
should be done by a licensed or
qualified service technician.
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.
Lower Compartment
Top Flange on
Door and Hinge
Glass Door
WARNING
Glass Door
4. Close the bottom control compartment
access panel.
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
Handle this glass with extreme
care! Temperedglassissuscep-
tible to damage – do not scratch
or handle roughly while rein-
stalling the glass door frame.
Bottom Vee-flange
Glass Door
Firebox Floor
Glass Door Latch
Figure 4 - INSTALLING GLASS DOOR
6
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INSTALL GRATE, VERMICULITE, GLOWING EMBERS AND LOGS
LOG SET - IDENTIFICATION
Bottom View of Logs (in packaging)
LOG SET
Catalog Number H3210
* Item
Description
A
B
C
D
E
Log, Center
Log, Left Rear
Log, Left Front
Log, Right Rear
Log, Top Center
Log, Front Center
C
A
B
F
F
* Item "letters" above correspond to photos on right
D
E
REFERENCE
Firebox Accessories / Parts
Cat. No.
88L53
Model No.
Description
FGE
Bag of Glowing Embers
(1 oz. rockwool)
Top View of Logs
Vermiculite, Bag (2 liters)
42363
B
E
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.
D
A
C
F
Top View of Logs - Installed
B
Glowing Embers
Separate into Quarter
Size (separate) Pieces
D
E
Bag of Glowing
Embers (rockwool)
C
(Valve Access Side)
A
Figure 5
F
7
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READ LOG WARNINGS ON PAGE 9 BEFORE PROCEEDING
8. Place Log (B) as shown in Figure 8.
Position Log (B) Against The Back Of
The Grate Here
1. Remove front glass enclosure panel from appliance.
a. Open Control Compartment Access Panel (see Control Compart-
ment Access Instructions on Page 4.).
B
b. Removetheglasspanelenclosure(seeRemovingGlassEnclosure
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. InstallVermiculite-Placesomevermiculiteonthefireboxflooraround
thegrate(theentirebagofvermiculitewillNOTbeused).SeeFigure13
on Page 9. DO NOT PLACE ANY VERMICULITE ON THE BURNER.
6. Placement of Glowing Embers -
Separatethe Embers(rockwool)intopiecesabout thesizeofaquarter
(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.
Position Groove at The Bottom Of Log (B) Over The Grate
Here And Slide It Against The Back Of The Grate
(Valve Access Side)
Figure 8
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).
9. Place Log (C) as shown in Figure 9.
Log (C) Lays Over Logs (A) and (B)
Place Embers on burner as shown.
B
A
C
(Valve Access Side)
DO NOT PLACE EMBERS OVER
GAS PORTS / AREAS CIRCLED
Position The Groove in The Back of Log (C)
Against The Grate
Figure 6
Figure 9
7. Place Log (A) on the grate as shown in Figure 7.
10. Place Log (D) as shown in Figure 10.
Position And Slide Log (D) Against The
The Grate
Back Of
A
A
Position The Groove At The Bottom Of
Position Groove At The Bottom Of
Log (A) Over The Grate And Slide It
Log (A) Over The Log Support Here
Forward Against The Grate Here
D
(Valve Access Side)
Figure 7
(Valve Access Side)
Place Log (D) Over The
Here
Flat Spot On Log (A)
Figure 10
8
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10. Place Log (E) as shown in Figure 11.
WARNING
Position round end of log (E) against the notch of
log (D) here. Two charred spots face the front
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.
E
D
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.
C
Position Small End of
Log (E) on The Notch of
Log (C) Here
(Valve Access Side)
Air Shutter Adjustment Guidelines
Figure 11
• 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.
11. Place Log (F) as shown in Figure 12.
• 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.
Log (F) sits in front of the grate
Flame Appearance & Sooting
Figure 13 *- Burner Flame Appearance
Proper flame appearance is a
flame which is blue at the base
andbecomesyellowish-orangein
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.
(Valve Access Side)
Figure 12
F
WARNING
Vermiculite
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.
The following chart is provided to aid you in
achieving the correct air shutter adjustment
for your installation.
CAUTION
The air shutter door and nearby
appliance surfaces are hot. Exer-
cise caution to avoid injury while
adjusting flame appearance.
Air Shutter Adjustment Guidelines:
Amount of
Primary Air
Flame
Color
Air Shutter
Adjustment
WARNING
Iflogsarenotinstalledaccording
totheloginstallationinstructions,
flameimpingementandimproper
combustioncouldoccurandresult
in soot and/or excessive produc-
tion of carbon monoxide (CO), a
colorless, odorless, toxic gas.
If air shutter is
closed too far
Flame will Air shutter
be orange gap should be
increased
CAUTION
If air shutter is
open too far
Flame will Air shutter
be blue gap should be
decreased
Carbonwillbeproducediftheair
shutter is closed too much. Any
damageduetocarboningresult-
ing from improperly setting the
air shutter is not covered under
the warranty.
WARNING
Air shutter adjustment should
only be performed by a qualified
professional service technician.
WARNING
DONOTattempttoinstallthelogs
untiltheapplianceinstallationhas
beencompleted,thegaslinecon-
nectedandtestedforleaksandthe
initial burner operation has been
checked out.
Burner Air Shutter Adjustment Procedure
1. Locateadjustmentrodandadjustairshutter
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.
WARNING
Ensure front glass panels are in
place and sealed during adjust-
9
me
n
t
.
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2. Lightappliance(followlightingprocedureon
lighting label in control compartment or see
homeowners manual).
3. Allowtheburnertooperateforatleast15min-
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.
Millivolt Appliance Checkout
Electronic 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.
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.
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.
ELECTRONIC PILOT ASSEMBLY
Proper Pilot Flame Appearance
• If flame appears weak or sooty, adjust
theairshutter,incrementally, toamore
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.
3/8" to 1/2"
Proper Flame
Adjustment
(9 -13 mm)
To light the burner, refer to the lighting instruc-
tions on Page 15.
Pilot
Nozzels
4. Leave the control knob (off/pilot/on) in the
ON position and the burner OFF/ON switch
OFF (& remote switches, if applicable).
5. Whensatisfiedthattheburnerflameappear-
ance is normal, close the lower control
compartment door.
Ground
Electrode
MILLIVOLT PILOT ASSEMBLY
Proper Pilot Flame Appearance
Flame Rod
Igniter Rod
Hood
Hot Surface
Igniter
Decrease Shutter Opening
In This Direction
Note - Burners are
omitted in this
view for clarity.
Thermocouple
Figure 16
3/8" Min.
(9 mm)
Withpropercareandmaintenance, yourappli-
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.
Orifice
Pilot
Nozzels
Thermopile
Air Shutter
Adjusting
Rod
Increase Shutter Opening
In This Direction
Figure 15
Main Burner Factory Air Shutter
Opening Setting - All Models
Model
Natural
Gas
Propane
Gas
1/8”
3.2mm
1/4”
6.4mm
MPD35ST
Adjustment Rod Positions
(when viewed from above)
Figure 14
10
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WIRING DIAGRAMS
Electronic Wiring Diagram (Honeywell) Showing Blower Wiring for Optional FBK-100, FBK-200 & FBK-250 Kits
Schematic Representation Only
Wiring diagrams are provided here for refer-
ence purposes only. This information is also
providedonschematicsattacheddirectlytothe
appliance on a pullout panel located within the
control compartment.
Wall Mounted Blower Speed Control Switch or
ON/OFF Switch for Blower Kit (optional)
Auxiliary View A
J-Box Wiring when
using unit mounted
relay module.
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.
Outlet Box Green
Ground Screw
BK
BK
W
G
120
VAC
W
G
Optional Blower
CAUTION
Junction Box
Label all wires prior to discon-
nection when servicing con-
trols. Wiring errors can cause
improper and dangerous appli-
ance operation.
*OFF/ON Switch
(Integral with
Gas Valve)
G
Pilot Burner
Assembly
BK
Break off Tab
R
Honeywell
Electronic
Gas
Junction
Box
White Wire
to Opposite
Side (neutral)
Hot side
of Outlet
Valve
Igniter
*
Leave the OFF/ON switch, which is
Connector
integral with the gas valve, in the ON
position.
Millivolt Wiring Diagram
GROUND
Transformer
** Optional Control Switches: Wall
Switch, Wall Thermostat or Remote
Control Receiver.
BL
BL
Schematic Representation Only
BL
BK
R
24 V
120 VAC
Primary
Secondary
Notes:
BK
If any of the original wire as supplied must
be replaced, it must be replaced with Type
AWM105 C - 18 gage wire.
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.
BK = BLACK BL = BLUE
BK
Optional Control Switch
R = RED
G = GREEN
W = WHITE
W
Field Wired
Factory
Wired
Figure 18
WARRANTY
REPLACEMENT PARTS
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.
A complete parts list is found at the end of
this manual. Use only parts supplied from the
manufacturer.
Thermopile
*Opt.
Switch
Normally, all parts should be ordered through
your Lennox distributor or dealer. Parts will be
shipped at prevailing prices at time of order.
Field Wired
Standard OFF/ON Switch
Factory
Retain this manual. File it with your other
documents for future reference.
Wired
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.
PRODUCT REFERENCE INFORMATION
*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.
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
Figure 17
Ifyouencounteranyproblemsorhaveanyques-
tions concerning the installation or application
of this system, please contact your distributor,
or Lennox directly:
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 ________________________________________________
LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, CA 92865
11
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ACCESSORY COMPONENTS
Product Reference Information
Cat. No.
Model
Ship.
Weight
Ship.
Volumn
H3201
H3202
H3203
MPD35ST-NM
MPD35ST-PM
MPD35ST-NE
220 lbs 46W x 26D x
43H (30 cu.ft.)
220 lbs 46W x 26D x
43H (30 cu.ft.)
220 lbs 46W x 26D x
43H (30 cu.ft.)
Remote Control Kit, Standard
Remote Control Kit, Deluxe
Cat. No.
H0249
Model No.
RCL
Description
Cat. No.
H0251
Model No.
RCL-STAT
Description
Remote Control System
(Standard)
Remote Control System
(Deluxe)
ꢃꢁ
ꢂꢁ
ꢄꢁ
ꢅꢁ
ꢀꢁ
(ref. Form # 750,127M)
(ref. Form # 750,129M)
Standard Remote Control System
Deluxe Remote Control System
The Model RCL (Standard) Remote Control System,
features a simplistic OFF/ON control function for the
fireplace. Thismodelincludesahand-heldtransmitter,
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 Model RCL-T (Deluxe) Remote Control System
has all of the features of the standard system along
withanaddedeasytoreadLCDscreenwhichpresents
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.
ꢀꢁ ꢂꢁ
ꢃꢁ ꢄꢁ ꢅꢁ
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.
Wall Thermostat, Millivolt
Cat. No.
89L36
Model No.
WTK
Description
Wall Thermostat Kit,
White
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.
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.
Wall Thermostat
The wall thermostat kit provides temperature control
for optimum comfort.
TheModelRCLcomescompletewithdetailedoperat-
ing instructions.
Decorative Firebox Accessories
Cat. No.
88L53
Model No.
FGE
Description
White Wall Switch Kit
Bag of Glowing Embers
(1 oz. rockwool)
Cat. No.
85L87
Model No.
FWSK
Description
Bag of Decorative
Volcanic Stone
Brickaded Wall Liner Kits
OFF/ON Wall Switch Kit
80L42
FDVS
Cat. No.
H3207
Model No.
Description
(FDVS ref. Form #750,010M)
OFF/ON Wall Switch Kit
MBLK-35ST Interior Brick Liner Kit
Bag of Glowing Embers
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.
Bag of Volcanic Stone
(ref. Form # 750,160M)
Replacement ember materials or volcanic stone are
available for use with these appliances. Order kits as
part of the periodic maintenance of the appliance.
Brickaded Panel Liner Kit
The brickaded liner kits include ceramic panels as
shown here. The panels have brick-like features
in relief.
12
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Note: Door & Trim Kits are for 1 side only. If set is desired, order 2 kits.
ACCESSORY COMPONENTS
Arch
Design
2-Piece Louver Kits
3 Piece Trim Kit
Arch Pane
Design
Cat. No.
96L05
Model No.
2LVR35PB
Description
Cat. No.
96K21
Model No.
TK35PB3
Description
2 Pc. Louver Kit,
Polished Brass
35” 3 Piece Finish Trim Kit,
Polished Brass
2 Pc. Louver Kit,
Brushed Stainless
96L09
2LVR35BS
(ref. Form # 750,147M)
(ref. Form # 504,224M)
Polished Brass 3-Piece Trim Kit
This kit contains brass trim pieces used to finish the
gapsbetweenthewallboardandthefireplace,provid-
ing the appliance a brass perimeter highlight. This kit
contains the trim pieces and these instructions.
Square
Design
2-PiecePolishedBrassandBrushedStainless
Louvers Kits
Theselouversaredesignedtoreplaceeitherthemiddle
charcoal louver of each set or the charcoal louver in
each set closest to the glass door. These kits include
twonarrowlouvers. Theyprovideatouchofelegance
to these appliances. These kits can be retrofitted to
previously installed appliances.
Square
Pane
Design
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.
35" Assembled Louver Kits
Cat. No.
88L28
Model No.
Description
Louver Kit, Polished
Brass
LVR35PB-2
Arch Pane Design Kits
Louver Kit, Brushed
Stainless
88L32
LVR35BS-2
H0930
H0931
H0932
H0933
APD35C 35” Arch Pane Doors, Char.
APD35TI 35” Arch Pane Doors, Text. Iron
APD35SP 35” Arch Pane Doors, Satin Pew.
APD35AB 35” Arch Pane Doors, Ant. Brass
(ref. Form # 750,119M)
Clean Face Charcoal Radiant Panel Kits
Cat. No.
88L36
Model No.
RAD35C-2
Description
Polished Brass & Brushed Stainless Louvers Kits
Decorative louvers are available for use with all
Multi-Open Series appliances.These kits include a
top3-pieceassemblyandabottom3-pieceassembly.
They provide a touch of elegance to any Multi-Open
Series appliance. These kits can be retrofitted to
previously installed appliances.
Clean Face Panel Kit
(ref. Form # 504,223M)
Arch Design Kits
Clean Face Panel Kits
Cat. No.
H0858
H0859
H0860
H0861
Model
Description
Cleanfacedpanelkitsareavailabletoconvertthestan-
dard louvered fireplaces to radiant models which are
more suited for finishing around the firebox opening
with non-combustible materials, such as tile.
AD35C 35” Arch Doors, Charcoal
AD35TI 35” Arch Doors, Textured Iron
AD35SP 35” Arch Doors, Satin Pewter
AD35AB 35” Arch Doors, Antique Brass
2-Piece Door Frame Kits
These kits are designed
to attach directly to
the front face of the
appliance at the glass
enclosure panel’s top
and bottom edges.
Square Design Kits
Cat. No.
H0946
H0947
H0948
H0949
Model
SD35C
Description
35” Sq. Doors, Charcoal
SD35TI 35” Sq. Doors, Textured Iron
SD35SP 35” Sq. Doors, Satin Pewter
SD35AB 35” Sq. Doors, Antique Brass
2 Piece Trim Kit
Cat. No.
Model No.
Description
Square Pane Design Kits
26M88 2DFK35PB
35” Door Trim Kit, Polished
Brass (2 Piece, Top and
Bottom)
4 Piece Trim Kit
H0962
H0963
H0964
H0965
SPD35C
35” Sq. Pane Doors, Char.
Cat. No.
96K17
Model No.
TK35PB4
Description
SPD35TI 35” Sq. Pane Doors, Text. Iron
SPD35SP 35” Sq. Pane Doors, Satin Pew.
SPD35AB 35” Sq. Pane Doors, Ant. Brass
26M91 2DFK35BS
35” Door Trim Kit, Brushed
Stainless (2 Piece, Top and
Bottom)
35” 4 Piece Finish Trim Kit,
Polished Brass
(ref. Form # ii-9299)
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
(ref. Form # 750,098M)
(ref. Form # 775,169M)
13
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ACCESSORY COMPONENTS
* 35" Eyebrow Hood Kits
Cat. No.
96K67
Model No.
EB35PB
Description
Hood Kit, Polished
Brass
* 35" Screen Heat Guard Kit
* 35" Arch Door Kits
Model No. Description
Hood Kit, Brushed
Stainless
Cat. No.
26M48
Model No.
HG35M
Description
35" Screen Heat Guard Kit
Cat. No.
88L49
EB35BS
26M43 ADK35CMPB Arch Door, Polished Brass
26M44 ADK35CMBS Arch Door, Brushed Stainless
* These hood kits replace the standard hood that
comes with these fireplaces.
* Order 2 for set if desired.
(ref. Form # 750,101M)
* Order 2 for set if desired.
(ref. Form #504,142M)
(ref. Form # 750,021M)
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
theappliance.Inadditiontoprovidinganaesthetically
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.
Arch Door Kits
Screen Heat Guard Kit
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
previouslyinstalledMulti-OpenSeriesappliances.The
decorative arch kits can not be used in conjunction
with the screen panel kit.
Thiseasytoinstalloptionalscreenheatguardinstalls
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).
Forced Air Blower Kits
Cat.
No.
Model No.
FBK-100
FBK-200
FBK-250
Description
80L84
80L85
80L86
Blower, Standard
(single speed)
Blower, Variable Speed
(w/wall-mounted switch)
Blower, Variable Speed
(w/unit-mounted switch)
Forced Air Kit
94L89
94L90
FBK-100-36
FBK-200-36
Blower, Standard, 36 Pack
TheFBK-100blowerprovidesconstantvelocityforced
air circulation. The FBK-200 assembly with variable
speed,wall-mountableswitchprovidesvariablespeed
forced air circulation. The FBK-250 assembly with
variable speed unit-mountable switch, also provides
variable speed forced air circulation.
Blower Kit - Variable Speed
with Wall Switch 36 Pack
H0543
FBK-250-36
Blower Kit - Variable Speed
with Thermo Snap Switch
36 Pack
4 Piece Door Trim Kits
Cat. No.
26M82
26M85
Model No.
4DFK35PB
4DFK35BS
Description
(ref. Form # 750,028M & 750,029M)
Door Trim, Polished Brass
Door Trim, Brushed Stainless
(ref. Form # 750,098M)
Touch-Up Paint Kits
Cat. No.
90L74
Model No.
Description
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.
TPK-C
TPK-T
Touch-Up Paint (Charcoal)
Touch-Up Paint (Tan)
98K67
(TPK-C ref. Form # 504,216M)
I
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.
14
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LIGHTING INSTRUCTIONS – MILLIVOLT GAS VALVE
FOR YOUR SAFETY READ BEFORE LIGHTING
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. This appliance has a pilot which must be lit with a piezo
igniter. When lighting the pilot, follow these instructions
exactly.
•
•
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.
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.
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.
WHAT TO DO IF YOU SMELL GAS
•
•
•
•
Extinguish any open flame.
Open windows.
Do not light any appliance.
Do not touch any electrical switches.
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
1. STOP! Read the safety information above on this page.
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.
2. Access the lower control compartment.
3. Turn OFF/ON switch to “OFF” (and remote wall switch, if appli-
7. Push in gas control knob slightly and turn counterclockwise
cable).
to “PILOT.”
4. Verify main line shut-off valve is open.
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.
5. Push in gas control knob slightly and turn clockwise
to “OFF.”
SIT Millivolt Gas Valve
•
If knob does not pop up when released, stop
and immediately call your service technician
or gas supplier.
N I N
T U O U T
TP/TH
TP
H
F
O
P
I
L
O
W
T
TH
•
If pilot will not stay lit after several tries,
turn the control knob to “OFF” and call
your service technician or gas supplier.
O
N
I
T O
Millivolt Pilot
- LO / HI +
GAS CONTROL
KNOB
9. Turn gas control knob counterclockwise
BURNER
OFF/ON SWITCH
PIEZO
IGNITER
to “ON.”
10. Close lower control compartment.
Note: Knob cannot be turned from “PILOT” to “OFF”
unless the knob is pushed in slightly. Do not force.
TO TURN OFF GAS TO APPLIANCE
1. Turn remote wall switch “OFF.” The pilot will remain lit for
4. Depress gas control knob slightly and turn clockwise
normal service.
to “OFF.” Do not force.
2. For complete shutdown, turn remote wall switch to “OFF.”
5. Close lower control compartment.
3. Access the lower control compartment.
15
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LIGHTING INSTRUCTIONS — ELECTRONIC
FOR YOUR SAFETY READ BEFORE LIGHTING
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
• Immediately call your gas supplier from a neighbor’s
exactly.
phone.
• If your gas supplier cannot be reached, call the fire
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.
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.
WHAT TO DO IF YOU SMELL GAS
• Extinguish any open flame.
• Open windows.
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.
• Do not light any appliance.
• Do not touch any electrical switches.
• Do not use any phone in your building.
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above on this page.
2. Turn remote wall switch to “OFF.”
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.
3. Open lower control compartment door.
4. Verify main line shut-off valve is open.
7. Turn the OFF/ON switch to “ON”. Do not force.
Honeywell Electronic Gas Control Valve
ON / OFF Switch
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).
Front View
TO TURN OFF GAS TO APPLIANCE
1. For complete shut-down, turn remote wall switch to
3. Turn the OFF/ON switch to “OFF”. Do not force.
4. Close the main line shut-off valve.
“OFF.”
2. Open lower control compartment door.
5. Close lower control compartment door.
16
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MAINTENANCE SCHEDULE
Annually (Before the onset of the Burning Season)
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 Qualified Service Technician
Height
Refer to Figure 13 on Page 9 and verify the flame pattern and
heightdisplayedbytheapplianceconformstothepicture. Flames
must not impinge on the logs. Ensure flames are steady (not
lifting or floating).
Inspecting/Cleaning Pilot and Burner
Checking Vent System
Qualified Service Technician
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.
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
Carefullyremovelogs,rockwool,volcanicstoneandvermiculite.
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 Homeowner
Height
Refer to Figure 13 on Page 9 and verify the flame pattern and
heightdisplayedbytheapplianceconformstothepicture.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.
17
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TROUBLESHOOTING
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.
TROUBLESHOOTING GUIDE - MILLIVOLT GAS CONTROL SYSTEM
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
1. Spark igniter will not light pilot after
A. Defective igniter
Check for spark at electrode and pilot; if no spark and
electrode wire is properly connected, replace igniter.
repeated triggering of igniter button.
(no spark at electrode).
B. Defective or misaligned electrode at pilot
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).
(spark at electrode).
C. Gas supply pressure errant.
Checkinletgaspressure. Itshouldbewithinthelimits
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 A. Wall switch or wires defective.
knob “ON,” and the (standard) burner
Check wall switch and wires for proper connections.
Jumper wire across terminals at wall switch, if burner
comeson,replacedefectivewallswitch.Ifokay,jumper
wiresacrosswallswitchwiresatvalve,ifburnercomes
on, wires are faulty or connections are bad.
OFF/ON switch is “ON." Read impor-
tant note below.
B. Thermopile may not be generating suf-
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.
IMPORTANT NOTE: If an optional
ficient millivolts.
*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.
C. Plugged burner orifice.
Check burner orifice for blockage and remove.
*Optional remote switch kits - wall
switch, wall thermostat or remote
control.
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-
A. Pilot flame may be too low or blowing (high)
Clean and/or adjust pilot flame for maximum flame
impingement on thermocouple (see Figure 15 on
Page 10).
lem.
causing the pilot/valve safety to drop out.
TROUBLESHOOTING GUIDE - ELECTRONIC IGNITION SYSTEM
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.
18
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TROUBLESHOOTING PROCEDURE - ELECTRONIC IGNITION SYSTEM
START
CHECK
• Line voltage power
• Low voltage transformer
• Limit controller
• Thermostat
• Turn Off Gas Supply.
• Check for proper volt-
age at control harness
(see insert A). Voltage
shouldbe24V between
thermostat or pressure
switchand24Vcommon
and 24V hot.
• Ensure Valve Switch Is In ON Position.
• Disconnect Control Harness.
• Set Thermostat To Call For Heat.
NO
2
• Wiring
YES
• Plug control harness into
valve. Wait for internal check
delay.
Insert A
End View of Control Harness Connector
24 Volt
Common
24 Volt Hot
• With pilot burner cable con-
nected, measure voltage at
valveHSIelementoutput. 24V
nominal. (See insert B)
1
NO
NO
• Igniter warms up and glows
red.
• Replace valve.
2
YES
YES
• Replace igniter/flame rod
assembly.
1
24 Volt
Switched
YES
Check For Damaged or Missing
Terminals in Connector
• Check that pilot gas is flowing. Wait
to ensure pilot gas tubing is purged.
Recycle call for heat if necessary.
NO
NO
NO
• Turn on gas supply.
• Pilot burner lights.
• Replace valve.
Insert B
YES
• Measurevoltagebetween24Vhotand
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.
Igniter Terminals
• Check transformer and
line volt supply.
YES
YES
•
Replace Pilot Assembly.
•
Check that pilot flame makes good
contact with pilot burner flame rod.
• Check for good electrical connection
through the pilot tubing.
•
Main valve opens and main
burner lights.
NO
• 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
Whenmeasuringvoltage
atconnections,usecare
2
1
NO
second ignition trial. All
voltage measurements must
be taken while the igniter is
powered.
to ensure terminals are
not damaged.
•
Main burner lights.
• Replace valve.
19
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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REPLACEMENT PARTS - MPD35ST
Item
Part/Cat.
Qty
Description
Misc. Replacement Parts
Log Set
Where Used
Item Part/Cat.No. Qty
Description
Where Used
SIT Millivolt Only
1
1
H3357
H3355
1
1
Gas Train Assembly, NG, MV
Gas Train Assembly, LP, MV
Honeywell Electronic Only
Gas Train Assembly, NG, Elecrtr.
MPD35ST-NM
MPD35ST-PM
14
15
H3210
1
2
All
All
Louver Assembly, Upper
Charcoal
LB-92449B
Louver Assembly, Lower,
Charcoal (valve access side)
2
3
H3356
42J32
1
1
MPD35ST-NE
16
LB-92652B
1
All
MPD35ST-NE &
MPD35ST-PE
Transformer
17
18
19
20
21
22
H3359
69L3101
94326
1
2
2
8
2
1
Louver Assembly, Lower, Char.
Magnet, Latch, Spring-Loaded
Magnet
All
All
All
All
All
Misc. Replacement Parts
Brickaded Side Panels
Burner, Pan
4
5
6
H3351
H3352
H3353
2
1
1
All
All
All
LB-95668
12L15
Nailing Flange
Nameplate, Lennox
* Electrical kit
24M1001
Orifice, Burner, NG, #37 (.104")
MPD35ST-NM &
MPD35ST-NE
7
8
LB-91941BY
93L32
2
1
2
Eyebrow Panel
All
All
All
All
All
All
All
Flex Line Gas Connector, FFGC
Glass Enclosure Assembly
Vermiculite, Bag of
22
23
42M79
111061
1
Orifice, Burner, LP, 1.55mm
(.061")
MPD35ST-PM &
MPD35ST-PE
9
LB-92398B
42363
MPD35ST-NM &
MPD35ST-PM
1
1
Piezo Igniter
10
11
12
13
H3358
1
4
1
Grate Assembly
24
25
10
27K30
H3363
42363
OFF/ON Switch, Rocker
Vent Restrictor
All
All
All
69L2101
H3354
Latch, Glass Enclosure Panel
Firebox Sub-Floor
1
Vermiculite, 1 Bag
*ElectricalOutletKitconsistsofajunctionbox, 2screws, anreceptacleoutlet, anOFF/ONrockerswitch
and a snap bushing. Note: All the components in the electrical kit will Not be used by every model.
Note: Ordering information for Volcanic Stone, Glowing Embers and Touch-up Paint can be found on
Page 12
4
3
7
15
8
9
15
10
22
17
2
25
20
6
8
22
9
1
11
16
13
21
Complete Log Set Available Only
14
8
5
19
18
12
24
23
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.
Printed in U.S.A. © 2005 by LENNOX HEARTH PRODUCTS
P/N 875,025M REV. NC 04/2005
1110 West Taft Avenue • Orange, CA 92865
20
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