LG MPB3328CNE User Manual

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

OTL Report No. 116-F-36-5

HOMEOWNER'S CARE AND OPERATION INSTRUCTIONS

B-VENT

MPB-33/35/40/45 SERIES

B-VENT GAS FIREPLACES

P/N 875,031M REV. A 02/2006

MODELS

WARNINGS

• Hot! Do not touch! The glass and surfaces of this appliance will be hot during operation and will retain heat for a while after shutting off the appliance. Severe burns may result.

• Carefully supervise children in the same room as appliance.

•

If small children are present in the home, it is recommended that this appliance be ﬁ tted with a screen door or screen panel kit. See Page 17 for ordering information.

WARNING: IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.

FOR YOUR SAFETY: Do not store or use gasoline or other ﬂ ammables 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 ﬁ re department.

Installation and service must be performed by a qualiﬁ ed installer, service agency or gas supplier.

Millivolt Models

MPB3328CNM MPB3328CPM MPB3530CNM

A French manual is available upon request. Order P/N 875,031CF

Ce manuel d’installation est disponible en francais, simplement en faire la demande. Numéro de la pièce 875,031CF.

MPB3530CPM MPB4035CNM MPB4540CNM

Electronic Models

MPB3328CNE MPB3530CNE

MPB4035CNE MPB4540CNE

AVERTISSEMENT: ASSUREZ-VOUS DE BIEN SUIVRE LES INSTRUCTIONS DONNÉ DANS CETTE NOTICE POUR RÉDUIRE AU MINIMUM LE RISQUE D'INCENDIE OU POUR ÉVITER TOUT DOMMAGE MATÉRIEL, TOUTE BLESSURE OU LA MORT.

POUR VOTRE SÉCURITÉ: Ne pas entreposer ni utiliser d'essence ni d'autre vapeurs ou liquides inﬂ ammables dans le voisinage de cet appareil ou de tout autre appareil.

POUR VOTRE SÉCURITÉ: Que faire si vous sentez une odeur de gaz:

• Ne pas tenter d'allumer d'appareil.

• Ne touchez à aucun interrupteur. Ne pas vous servir des téléphones se trouvant dans le batiment où vous vous trouvez.

• Evacuez la piéce, le bâtiment ou la zone.

• Appelez immédiatement votre fournisseur de gaz depuis un voisin. Suivez les instructions du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz, appelez le service dos incendies.

L'installation et service doit être exécuté par un qualiﬁ é installeur, agence de service ou le fournisseur de gaz.

CONGRATULATIONS!

In selecting this Lennox B-Vent Gas Appliance you have chosen the ﬁ nest and most dependable ﬁ replace to be found anywhere. A beautiful, prestigious, alternative to a wood burning ﬁ replace. Welcome to a Family of tens of thousands of satisﬁ ed Lennox Fireplace Owners.

Please read and carefully 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.

TABLE OF CONTENTS

Introduction ......................................Page 2

General Information ..........................Page 2

Operation/Care of Your Appliance .....Page 3

Variable Flame Adjustment ................Page 4

Outside Combustion Air Control .......Page 5

Manual Limit Switch .........................Page 5

Maintenance Schedule ......................Page 6

Maintenance ......................................Page 7

Front Glass Enclosure Panel,

Removal and Installation ...............Page 7

Burner Adjustments ..........................Page 8

Millivolt Appliance Checkout .............Page 8

Electronic Appliance Checkout ..........Page 8

Logs, Rockwool, Vermiculite &

Volcanic Stone Placement .............Page 9

Wiring Diagrams ...............................Page 14

Warranty ...........................................Page 14

Replacement Parts ............................Page 14

Product Reference Information .........Page 14

Accessory Components ....................Page 15

Lighting Instructions – Millivolt ........Page 18

Lighting Instructions – Electronic .....Page 20

Troubleshooting Guide – Millivolt .....Page 22

Troubleshooting Guide – Electronic ..Page 22

Replacement Parts List .....................Page 24

INTRODUCTION

The millivolt appliances are designed to operate on either natural or propane gas. A millivolt gas control valve with piezo ignition system provides safe, efﬁ cient operation. External electrical power is required to operate the optional electrically powered components, if installed. Electrical power must be wired during appliance installation.

The electronic appliances are designed to operate on either natural or propane gas. An electronic intermittent pilot system provides safe, efﬁ cient operation. External electrical power is required to operate these units.

These appliances comply with National Safety Standards and are tested and listed by OMNITest Laboratories, Inc. (Report No. 116-F-__-__) to ANSI Z21.50 (in Canada, CSA 2.22), and CAN/CGA-2.17-M91 in both USA and Canada, as vented gas ﬁ replaces.

Installation must conform to local codes. In the absence of local codes, installation must comply with the current National Fuel Gas Code, ANSI Z223.1 (NFPA 54). (In Canada, the current CAN/CGA B149 installation code). Electrical wiring must comply with local codes. In the absence of local codes, installation must be in accordance with the National Electrical Code, NFPA 70 - (latest edition). (In Canada, the current CSA C22.1 Canadian Electric Code).

DO NOT ATTEMPT TO ALTER OR MODIFY THE CONSTRUCTION OF THE APPLIANCE OR ITS COMPONENTS. ANY MODIFICATION OR ALTERATION MAY VOID THE WARRANTY, CERTIFICATION AND LISTINGS OF THIS UNIT.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualiﬁ ed installer, service agency or the gas supplier.

GENERAL INFORMATION

Note: Installation and repair should be performed by a qualiﬁ ed service person. The appliance should be inspected annually by a qualiﬁ ed professional service technician. More frequent inspections and cleanings may be required due to excessive lint from carpeting, bedding material, etc. It is imperative that the control compartment, burners and circulating air passage ways of the appliance be kept clean.

S'assurer que le brùleur et le compartiment des commandes sont propres. Voir les instructions d'installation et d'utilisation qui accompagnent l'appareil.

Provide adequate clearances around air openings 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 trafﬁ c and away from furniture and draperies. Locate furniture and window coverings accordingly.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

WARNING

These ﬁ replaces are vented decorative gas appliances. Do not burn wood or other material in these appliances.

These appliances are designed to operate on natural or propane gas only.

Input of millivolt models is variable. These rates are shown in Table 1:

Millivolt Models with

Manually-Modulated Gas Valve

Natural Gas Propane Gas

Model Input Rate

MPB3328 MPB3530 MPB4035 MPB4540

Table 1

Electronic Models -

Electronic models have a ﬁ xed rate gas valve. Input of electronic models is shown in Table 2:

Model Input Rate

MPB3328 MPB3530 MPB4035 MPB4540

Table 2

Table 3 shows the units' oriﬁ ce size for the

elevations indicated.

Elevation 0-4500 feet ( 0-1372 meters)

Models

MPB-3328 #47 (.0785") 1.2mm (.048")

MPB-3530 #44 (.086") #55 (.052")

MPB-4035 #37 (.104") 1/16"

MPB-4540 #36 (.1065") #52

Table 3

Maximum manifold pressure is 3.5 in. w.c. (0.87 kPa) for natural gas and 10 in. w.c. (2.49 kPa) for LP/Propane gas.

Do not use these appliances if any part has been under water. Immediately call a qualiﬁ ed, professional service technician to inspect the appliance and to replace any parts of the control system and any gas control which have been under water.

(BTU/HR) 13,500 to 17,500 13,500 to 17,500 16,000 to 20,000 16,500 to 20,000 24,000 to 30,000 22,300 to 28,000 24,750 to 31,000 23,000 to 29,000

Electronic Models with

Fixed-Rate Gas Valve

Natural Gas Propane Gas

(BTU/HR)

17,500 17,500 20,000 20,000 30,000 28,000 31,000 29,000

Burner Oriﬁ ce Sizes

NaturalGas

drill size (inches)

Input Rate

(BTU/HR)

Input Rate

(BTU/HR)

Propane Gas

drill size (inches)

(.0625")

(.0635")

Ne pas se servir de cet appareil s'il a été plongé dans l'eau, complètement ou en partie. Appeler un technicien qualiﬁ é pour inspecter l'appareil et remplacer toute partie du système de contrôle et toute commande qui ont été plongés dans l'leau.

Test gauge connections are provided on the front of the millivolt gas control valve (identiﬁ ed OUT for the manifold side and IN for inlet pressure. A 1/8" NPT test gauge connection is provided on the electronic gas control valve adjacent to the outlet to the main burner.

Minimum inlet gas pressure to these appliances is

5.0 inches water column (1.24 kPa) for natural gas and 11 inches water column (2.74 kPa) for propane for the purpose of input adjustment.

Maximum inlet gas supply pressure to these appliances is 10.5 inches water column (2.61 kPa) for natural gas and 13.0 inches water column (3.23 kPa) for propane.

The appliance must be isolated from the gas supply piping system (by closing its individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

The appliance and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system at pressures in excess of 1/2 psig (3.5 kPa).

These appliances must not be connected to a chimney or ﬂ ue serving a separate solid fuel burning appliance.

Any safety guard or screen removed for servicing the appliance must be replaced prior to operating the appliance.

WARNING

B-Vent appliances are not designed to operate in negatively pressured environments (pressure within the home is less than pressures outside). Significant negatively pressured environments caused by weather, home design, or other devices may impact the operation of these appliances. Negative pressures may result in poor ﬂ ame appearance, sooting, damage to property and/or severe personal injury. Do not operate these appliances in negatively pressured environments.

Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning are similar to the ﬂ u with headaches, dizziness and/or nausea. If you have these signs, obtain fresh air immediately. Turn off the gas supply to the appliance and have it serviced by a qualiﬁ ed professional, as it may not be operating correctly.

WARNING

Failure to comply with the installation 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 appliance can cause serious injury or death form ﬁ re, burns, explosion or carbon monoxide poisoning.

WARNING

Children and adults should be alerted to the hazards of high surface temperatures. Use caution around the appliance to avoid burns or clothing ignition. Young children should be carefully supervised when they are in the same room as the appliance.

WARNING

Do not place clothing or other ﬂ ammable materials on or near this appliance.

AVERTISSEMENT

Surveiller les enfants. Garder les vêtements, les meubles, l'essence ou autres liquides à vapeur inﬂ ammables lin de l'appareil.

OPERATION AND CARE OF YOUR APPLIANCE

Appliance operation may be controlled through a remotely located optional wall switch. Separate switches may provide independent control for the remote controlled ﬁ replace operation (optional equipment).

In lieu of remote or remote wall switch operation, the appliance must be operated directly through the controls located on the front of the valve located within the control compartment which is located behind the control compartment access panel below the appliance front glass enclosure panel. See Figure 1.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Control Compartment Access Panel

Piezo Igniter

Figure 1

Millivolt

Gas Valve

Gas Controls/Control Compartment Access

The gas controls can be found behind the control compartment access panel. To open the control compartment access panel, actuate the spring loaded magnetic catches securing the panel. First, gently depress the upper right top corner of the panel until the magnet catch "pops" the door free. Then, gently pulling the panel forward, disengage the left magnet catch and allow the panel to swing down to open.

Operation of millivolt and electronic gas control systems are different. Before lighting and operating your appliance determine if you have a millivolt or electronic appliance. See Figure 1 for access to the control compartment.

Millivolt appliances will be ﬁ tted with the gas control valve shown in Figure 3 on Page 4.

Appliances with electronic systems will be ﬁ tted with the electronic valve shown in Figure 2 on Page 4.

Familiarize yourself with the gas control valve that your appliance uses.

Millivolt Appliances -

To light millivolt appliances refer to the detailed lighting instructions found on Page 18 (English)

and Page 19 (French). Millivolt appliance lighting instructions may also be found on the pull-out lighting instruction labels attached to the gas control valve. Refer to Figure 3 on Page

4 for the location of the piezo Igniter.

Millivolt appliances may be ﬁ tted with an optional burner ON/OFF Rocker Switch. The optional ON/ OFF Rocker switch will be installed in the bracket just beneath the gas control valve. Once the pilot is lit, the ON/OFF rocker switch will control the appliance ON/OFF operation. To operate: Toggle the switch between its ON and OFF positions.

If your millivolt appliance is equipped with an optional remote wall switch or remote control kit and the pilot is lit, the appliance main burner may be turned on and off with the wall switch or remote control.

Electronic Appliances -

To light electronic appliances refer to the detailed lighting instructions found in both English and French on Pages 20 and 21 of these instructions respectively. Electronic appliance lighting

instructions may also be found on the pull out lighting instruction labels attached to the gas control valve. If your electronic appliance is

equipped with an optional remote wall switch or remote control kit the appliance main burner may be turned on and off with the wall switch or remote control.

If your electronic appliance is not equipped with a wall switch or remote control, the main burner must be turned off and on with the gas control switch. Toggle the switch from ON to OFF to operate the main burner .

ON/OFF Switch

I S P

Inlet Pressure Port

Electronic Gas Control Valve

Manifold Pressure Port

C O

TN OR

GI N I

T ER

Honeywell Electronic Gas Valve

Figure 2

Variable Flame Height Adjustment

Inlet Pressure Port

Manifold Pressure Port

T P

HTPT

Piezo Igniter

OUT

Optional Burner ON/OFF Rocker Switch Location

Figure 3

3. Keep lower control compartment clean by vacuuming or brushing at least twice a year. More frequent cleaning may be required due to excessive lint from carpeting, bedding materials, etc. It is important that control compartments, burners and circulating air passageways of the appliance be kept clean.

4. Always turn off gas to the pilot (millivolt appliances) before cleaning. Before re-lighting, refer to the lighting instructions in this manual. Instructions are also found on a pull-out panel located on the ﬂ oor of the appliance.

5. Always keep the appliance area clear and free from combustible materials, gasoline and other ﬂ ammable liquids.

Piezo Igniter

Main Gas

Control Knob

(One of Two Places)

SIT Millivolt Gas Valve

6. Remember, Millivolt appliances have a continuous burning pilot ﬂ ame. Exercise caution when using products with combustible vapors.

7. Clean the front glass enclosure only when necessary. Wipe surface with clean, dampened, soft cloth. Follow with dry, soft towel as desired. Take care not to scratch the glass surface.

WARNING

Do not use abrasive cleaners. Never clean the glass when it is hot.

CAUTION

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 ﬁ xed low and high settings, alternately, while the appliance is in operation. Adjust the ﬂ ame height as desired after lighting the appliance by rotating the variable adjustment control knob located on the front of the valve

(refer to Figure 3).

2. When lit for the ﬁ rst time, this appliance will

emit a slight odor for an hour or two. This is due to the “burn-in” of internal paints and lubricants used in the manufacturing process.

Do not attempt to touch the front enclosure glass with your hands while the ﬁ replace is in use.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Outside Combustion Air Controls

Many appliances are equipped, when installed, with an outside (make-up air) vent system that is designed to provide the appliance with outside make-up air for combustion when in operation. The combustion air control lever for the outside air system is standard on all appliances but should not be operated if the complete system is not installed. Refer to Figure 4. When the complete outside air vent system is installed, the installer will remove the securing screw from the combustion air control lever located on the left side of the ﬁ replace bottom opening.

If the securing screw has not been removed and you have reason to believe that you have a complete outside air system, contact your distributor to have your appliance inspected for the presence of the complete system. DO NOT assume that you have this system in place.

Outside Air Control Lever

Securing Screw

Air Shutter in Closed Position

Outside Air Control Lever

Securing Screw Removed

Air Shutter in Open Position

Combustion Air Control Lever and Securing Screw Location

Figure 4

WARNING

Do not operate the shutoff lever unless a complete outside combustion air system has been installed with your appliance.

To open the outside air shutter, open the bottom control access panel, reach into control compartment and pull the combustion air control lever all the way out. The outside air shutter should be fully open when the ﬁ replace is in use and completely closed when the ﬁ replace is not being used. Closing it when not in use will prevent outside cold air from entering the dwelling.

Step 13. Spillage Test and Safety Limit Switch Operation

Spillage Test

After appliance installation, perform this spillage test to verify that proper venting conditions exist:

1 - Place unit in its normally-operated condi-

tion, that is, with the glass enclosure panel in place.

2 - Close all doors and windows in the room.

Turn on all exhaust fans in the house.

3 - Light the appliance. 4 - Wait 15 minutes. 5 - To check for venting action, start by holding

a smoke producing device within an inch of one edge (side edge, not top or bottom edge) of the glass enclosure panel. The smoke should be drawn toward the edge of the glass enclosure panel. Continue the test by moving the smoke producing device along the entire length of both side-edges of the glass door.

6 - If the smoke is not drawn towards the

edges of the glass door turn off the appliance and call a qualiﬁ ed service

technican.

Manually-Reset Safety Limit Switch

This appliance is equipped with a manually-reset blocked ﬂ ue safety limit switch. Refer to Figure 5 on Page 7 for its location. If, during appliance operation, the ﬂ ame goes out (independently of the burner on/off wall switch), it may be due to the operation of this safety limit switch. First allow the appliance to cool. Remove top louver panel. Then reset the safety limit switch by pushing the red reset button, located between the wire terminals, on the back of the switch. See Detail A of Figure 5 for location.

The appliance should then relight and remain lit. Reinstall top louver panel. If the appliance does not relight, turn off the appliance and call

for a qualiﬁ ed service technician.

To replace the blocked ﬂ ue safety limit switch refer to Figure 5 on Page 7 (Details

B and C):

NOTE - This procedure should only be performed

by a qualiﬁ ed service technician.

Important - Turn electrical power off before beginning this procedure.

1 - Lower the bottom control compartment

access panel. Remove the glass enclosure panel: open the latch (located in the center of the unit front opening, under the ﬁ rebox ﬂ oor) securing the glass enclosure panel. Remove the panel by tilting it outward at the bottom and lifting it up. Set the door aside protecting it from inadvertent damage. See Figure 6 on Page 7.

2 - Remove the lintel securing screws (3) and

then remove the lintel. One of the lintel cabinet top holes is shown in Figure 5 (Detail B).

3 - Remove the scoop securing screws (3)

and then remove the scoop. See Figure 5 (Detail B).

4 - Remove the safety switch bracket securing

screws (2), and pull the switch/bracket assembly, with low voltage wires attached, through the side panel slot into the ﬁ rebox. See Figure 5 (Detail C).

5 - Replace the switch. 6 - Reinstall the switch/bracket assembly. 7 - Reinstall the scoop and lintel. 8 - Reinstall the glass enclosure panel. 9 - Raise the bottom control compartment

access panel.

10 - The appliance should then relight and

remain lit. If this does not occur, check unit for a blocked ﬂ ue condition.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

MAINTENANCE SCHEDULE - Annually (Before the onset of the Burning Season)

MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE

Inspecting/Cleaning Burner, Logs and Controls

Check Flame Patterns and Flame Height

Inspecting/Cleaning Pilot and Burner Qualiﬁ ed Service Technician

Checking Vent System Qualiﬁ ed Service Technician Inspect the vent system at the top and at the base (within the

Appliance Checkout Qualiﬁ ed Service Technician Perform the appropriate appliance checkout procedure detailed

Replacing Rockwool Ember Materials Homeowner/Qualiﬁ ed Service

Qualiﬁ ed Service Technician Inspect valve and ensure it is properly operating. Check piping

for leaks. Vacuum the control compartment, ﬁ replace logs and burner area.

Qualiﬁ ed Service Technician

Technician

Refer to Figure 10 (MPB-3328), Figure 11 (MPB-3530) or Figure 12 (MPB-4035 & MPB-4540) on Page 9 and verify the ﬂ ame pattern and height displayed by the appliance conforms to the picture. Flames must not impinge on the logs.

Refer to Figures8 or 9 on Page 8. Remove any surface build-up on pilot and burner assembly. Wipe the pilot nozzles, igniter/ ﬂ ame rod and hood. Ensure the pilot ﬂ ame engulfs the ﬂ ame sensor as shown.

ﬁ rebox) for signs of blockage or obstruction. Look for any signs of dislocation or deterioration of the vent components.

in this manual.

Remove old ember materials (rockwool) and vacuum the ember placement area. Place new embers as described on

Pages 9-13.

MAINTENANCE SCHEDULE - Periodically (After the Burning Season)

MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE

Cleaning Firebox Interior Homeowner Carefully remove logs, embers (rockwool), and volcanic stone.

Vacuum out interior of the ﬁ rebox. Clean ﬁ rebox walls. Replace logs, embers (rockwool) and volcanic stone as detailed in this manual (see Pages 9-13 ).

Check Flame Patterns and Flame Height

Checking Vent System Homeowner Inspect the vent system at the top and at the base (within the

Cleaning Front Glass Enclosure Panel Homeowner Clean as necessary following the directions provided in this

Homeowner

Refer to Figure 10 (MPB-3328), Figure 11 (MPB-3530) or Figure 12 (MPB-4035 & MPB-4540) on Page 9 and verify the ﬂ ame

pattern and height displayed by the appliance conforms to the picture. Flames must not impinge on the logs.

ﬁ rebox) for signs of blockage or obstruction. Look for any signs of dislocation of the vent components.

manual. DO NOT TOUCH OR ATTEMPT TO CLEAN GLASS

WHILE HOT.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Detail A

Fire Box Top

Detail B

Fire Box Top

Detail C

Wire Termianls

Cabinet Corner

Back Of Limit Switch

Door Frame

Lintel Securing Screw Hole in Cabinet Top

Scoop

Scoop Securing Screws

Lintel Securing-Scre

Hole in Cabinet Top

Limit/Bracket

Securing Screws

Limit

Refer to the maintenance schedule for maintenance tasks, procedures, periodicity and by whom they should be performed. Always verify proper operation of the appliance after servicing.

IMPORTANT: TURN OFF GAS AND ANY ELECTRICAL POWER BEFORE SERVICING THE APPLIANCE.

Front Glass Enclosure Panel, Removal and Installation.

WARNING

Never operate the appliance without the glass enclosure panel in place and secure. Do not operate appliance with the FRONT glass panel cracked, broken or missing. Replacement panels are available through your local LENNOX Dealer and must be installed by a licensed or qualiﬁ ed service technician.

These appliances are designed to operate only with the front glass enclosure panel properly installed. Generally, the glass enclosure panel should not be removed except to gain access to the components within the ﬁ rebox, and the appliance may only be operated without the front glass enclosure panel in place for very brief periods of time during initial appliance checkout and adjustment.

IMPORTANT

The glass door of this appliance must only be replaced as a complete unit as provided by the manufacturer. Do not attempt to replace broken, cracked or chipped glass separately.

Refer to Figure 6 and remove the front glass enclosure panel as follows:

1. Remove the top louver assembly or radiant

panel.

2. Open the hinged drop-down control compartment access panel.

3. Locate the latch at the top of the control compartment and disengage it from the door frame bottom Vee-ﬂ ange, pulling down on its handle to open it.

4. Swing the bottom of the door out and raise it slightly to lift the top ﬂ ange of the door frame away from the appliance.

Top Flange Door Frame

Latch

Glass Door

Blocked Flue Safety Limit Location

Inside View of Firebox -

Top/Right Side Intersection

Figure 5

Maintenance

The appliance and venting system should be thoroughly inspected before initial use and at least annually by a qualiﬁ ed service technician. However, more frequent periodic inspections and cleanings should be performed by the homeowner. Homeowner must contact a qualiﬁ ed

service technician at once if any abnormal condition is observed.

WARNING

Turn off gas and electrical power before servicing the appliance.

During this appliance checkout and adjustment period, a potential safety hazard exists

- EXERCISE EXTREME CAUTION to prevent the occurrence of any burn injuries from the exposed ﬂ ames or hot surfaces. Also note,

that while the front glass enclosure panel is removed, the ﬂ ame appearance will appear to be smaller than normal.

WARNING

Handle the glass with extreme care! Tempered glass is susceptible to damage (scratches, for example) – Handle glass door (glass enclosure panel) gently while reinstalling it.

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.

Bottom Vee-flange Door Frame

Figure 6

To install the front glass enclosure panel, proceed as follows:

1. Retrieve the glass door frame. Visually

inspect the gasket on the backside of the panel. The gasket surface must be clean, free of irregularities and seated ﬁ rmly.

2. Position the door frame in front of the ﬁ rebox

opening and engage the top ﬂ ange over the lip at the top of the ﬁ rebox opening.

3. Swing the door down and back. Ensure the

gasket seats evenly as the door draws shut. Engage the Vee-ﬂ ange at the bottom of the door with the latch and close the latch to secure the door.

4. Reinstall the top louver assembly or radiant

panel.

Firebox Floor

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Burner Adjustments

SIT Millivolt Appliance Checkout

Electronic Appliance Checkout

Note - The air shutter for the burner primary

air opening is factory-set. Do not adjust the factory-set position. The factory-set position is shown in Figure 7.

Burner Air Shutter Adjustment

Setscrew - Factory Located in the Natural Gas Position; Relocate Set Screw for LP/Propane Gas in the Alternate Position. See Table for Air Shutter Openings for these Setscrew Locations.

Venturi

Air Shutter

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model Natural

Gas

MPB-3328 Fully Closed

MPB-3530 Fully Closed

MPB-4035 Fully Closed

MPB-4540 Fully Closed

Propane

Gas

3/16"

(4.76 mm)

3/16"

(4.76 mm)

3/16"

(4.76 mm)

3/16"

(4.76 mm)

The pilot ﬂ ame should be steady, not lifting or ﬂ oating. 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" min (tip) of the quick drop out thermocouple should be engulfed in the pilot ﬂ ame. The ﬂ ame should project 1" (25 mm) beyond the hood at all three ports (Figure 8).

To light the burner, refer to the lighting instructions on Pages 18 and 19.

SIT MILLIVOLT PILOT ASSEMBLY

Proper Pilot Flame Appearance

Igniter Rod

3/8" Min.

(9 mm)

Thermocouple

Pilot Nozzels

Figure 8

Hood

Thermopile

To light the burner, refer to the lighting instructions on Pages20 and 21. Ensure the igniter lights the pilot. The pilot ﬂ ame should engulf the ﬂ ame sensor as shown in Figure 9.

ELECTRONIC PILOT ASSEMBLY

Proper Pilot Flame Appearance

Proper Flame

Adjustment

Pilot Nozzels

3/8" to 1/2" (9 -13 mm)

Ground

Electrode

Flame Rod

Hot Surface

Igniter

Figure 9

With proper care and maintenance, your appliance will provide many years of enjoyment. If you should experience any problem, ﬁ rst refer to the trouble shooting guide in this manual. If problem persists, contact your Lennox distributor.

Figure 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Log Placement

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.

WARNING

This appliance is not meant to burn wood. Any attempt to do so could cause irreparable damage to your appliance and prove hazardous to your safety.

WARNING

The size and position on the log set IS Critical to give your appliance a safe, reliable and attractive ﬂ ame pattern. Any attempt to use a different log set in the ﬁ replace will void the Warranty and will result in incomplete combustion, sooting, and poor ﬂ ame quality.

Figure 10

Burner Flame Appearance - Model MPB-3328

Initial Installation Considerations

The packaged logs are located within the ﬁ rebox. The decorative volcanic stone and glowing embers are packaged separately in plastic bags located in the control area of the ﬁ replace.

If the logs are being installed for the ﬁ rst time, the following paragraphs apply:

DO NOT attempt to install the logs until the appliance installation has been completed, the gas line connected and tested for leaks and the initial burner operation has been checked out.

Proper twig placement is critical to prevent sooting. Twigs should be placed in the gaps between the ﬂ ame peaks and should be positioned so that at no time they impinge the ﬂ ames.

Step 1. Remove the appliance front door. Step 2. Remove the log set from the interior

of the ﬁ replace.

Step 3. Remove the logs from their packaging. Handle logs carefully to prevent breakage. Step 4. MPB-4035 & MPB-4540 Models

- Remove the restraining strap from the grate

tines. Ensure the grate is fully inserted into the holes on the ﬁ rebox rear panel and over the indents on the ﬁ rebox ﬂ oor.

Figure 11

Figure 12

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Burner Flame Appearance - Model MPB-3530

Burner Flame Appearance - Model MPB-4035 & MPB-4540

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