Lennox MPB35ST-NM User Manual

HOMEOWNER'S CARE AND OPERATION INSTRUCTIONS

B-VENT SEE-THROUGH

MERIT® PLUS SERIES

B-VENT GAS FIREPLACES

P/N 875,024M REV. NC 04/2005

MODELS

Millivolt Models Electronic Models

MPB35ST-NM MPB35ST-NE MPB35ST-PM

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 the gas supplier.

A French manual is available upon request. Order P/N 875,024CF

Ce manuel d’installation est disponible en francais, simplement en faire la demande. Numéro de la pièce 875,024CF

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

Listing Agency

OTL Report No. 116-F-27-5

CONGRATULATIONS!

In selecting this LENNOX B-Vent Gas Appliance you have chosen the ﬁ nest and most dependable ﬁ replace to be found anywhere. Its 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 carefully read and follow all of the instructions found in this manual. Please pay special attention to the safety instructions provided in this manual. The Homeowner's Care and Operation Instructions included here will assure that you have many years of dependable and enjoyable service from your LENNOX product.

TABLE OF CONTENTS

Introduction .......................................page 2

General Information ...........................page 2

Gas Controls/Control Compartment,

Access .............................................page 4

Operation/Care of Your Appliance ......page 4

Variable Flame Adjustment .................page 5

Venting Action and (spill switch) .......page 5

Outside Combustion Air Control ........page 6

Maintenance .......................................page 6

Front Glass Enclosure Panel,

Removal and Installation ..................page 7

Logs, Vermiculite & Ember Placement page 8

Burner Adjustments ...........................page 10

Maintenance Schedule .......................page 11

Troubleshooting Guide – Millivolt ......page 12

Troubleshooting Guide – Electronic ...page 12

Millivolt Appliance Checkout ..............page 14

Electronic Appliance Checkout ...........page 14

Wiring Diagrams ................................page 14

Warranty ............................................page 14

Product Reference Information ..........page 14

Accessory Components .....................page 15

Lighting Instructions – Millivolt .........page 18

Lighting Instructions – Electronic ......page 19

Replacement Parts List ......................page 20

INTRODUCTION

The millivolt appliances have a millivolt gas control valve witha piezo ignition system which provides safe, efﬁ cient operation.

The electronic appliances have an electronic intermittent pilot system provides safe, efﬁ cient operation. External electrical power is required to operate these units.

LISTING AS FOLLOWS:

These appliances comply with National Safety Standards and are tested and listed by OmniTest Laboratories (Report No. 116-F-27-5) to ANSI Z21.50 - 2000 (in Canada, CSA 2.22

- 2000), 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.)

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.

IMPORTANT

It is imperative that the control compartment, burners and circulating air passage ways of the appliance be kept clean. See Maintenance instructions on Pagex 6.

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.

These appliances are designed to operate on natural or propane gas only. The use of other fuels or combination of fuels will degrade the performance of this system and may be dangerous.

Millivolt Models - BTU Input

Millivolt models come standard with the manually-modulated gas valve; ﬂ ame appearance and heat output can be controlled at the gas valve. Input of for these models is shown in the following table:

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Input (BTU) Manually-Modulated Gas

Valves (millivolt models)

Models Fuel

Type

MPB35ST-NM Nat. Gas

MPB35ST-PM Propane

Input Rate

(BTU / HR)

30,000 high

23,000 low

28,000 high

22,000 low

Table 1

Electronic Models -

Electronic models have a ﬁ xed rate gas valve. Input of electronic models is shown in the following table:

Input (BTU) - Fixed Rate

(electronic models)

Models Fuel

Type

MPB35ST-NE Nat. Gas 30,000

MPB35ST-PE

(if ﬁ eld converted)

Pro. Gas 28,000

Input Rate (BTU / HR)

Table 2

Gas Pressure -

Tables 3, 4 and 5 show the appliances' gas pressure requirements.

Inlet Gas Supply Pressure

(all models)

Fuel # Minimum Maximum

Natural Gas

Propane

5.0" WC

(1.24 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Table 3

Manifold Gas Supply Pressure

(millivolt models)

Fuel # Low High

Natural

Gas

Propane

(Lo) 2.2" WC

(.55 kPa)

(Lo) 6.3" WC

(1.57 kPa)

(Hi) 3.5" WC

(.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 4

Manifold Gas Supply Pressure

(electronic models)

Fuel # Fixed

Natural Gas

Propane

3.5" WC

(.87 kPa)

10.0" WC

(2.49 kPa)

Table 5

Test gauge connections are provided on the front of the millivolt gas control valve, identiﬁ ed IN for the inlet and OUT for the manifold side (see Fig- urex 2 on Pagex 4 ). A 1/8" NPT Test gauge con- nection is provided at the inlet and outlet side of the electronic gas control valve (see Figurex 3 on Pagex 5).

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).

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).

Oriﬁ ce Sizes - Sea Level to High Altitude (All Models)

These appliances are tested and approved for installations at elevations of 0-4500 feet (0-1372 meters) above sea level using the standard burner orifice sizes (marked with an "*" in Table 6 ). For elevations above 4500 feet, these appliances must be properly "derated" by the gas supplier or qualiﬁ ed service technician (usually done at the time of installation).

Note: Derated (deﬁ nition) - Replacing burner oriﬁ ce with a smaller one to reduce BTU input. The installation of this appliance must be according to the regulations of the local authorities having jurisdiction and, in the USA, the National Fuel Gas Code NFPA 54 / ANSI Z223.1 - latest edition or, in Canada, the CAN1-B149.1 and .2 codes - latest edition.

Burner Oriﬁ ce Sizes (all models)

Elevation

Feet (meters)

0-4500

(0-1372)

* Standard size installed at factory

• Part /Cat. Number

Table 6

Burn-in Period

During the ﬁ rst few ﬁ res of this appliance there will be some odor due to the curing of paint and burning off of lubricants used in the manufacturing process.

Depending on your use, the burn-in period may take a few hours or a few days.

Natural

Gas

drill size (inches)

#37 (.104")

24M1001 •

Propane

Gas

drill size (inches)

1.55

(.061")

42M7901 •

KEEP YOUR HOUSE WELL VENTILATED DURING THE CURING PROCESS. THE ODOR AND HAZE EMITTED BY THE CURING PROCESS CAN BE QUITE NOTICEABLE AND MAY SET OFF A SMOKE DETECTOR.

A white ﬁ lm may develop on the glass front during the ﬁ rst few ﬁ res as part of the curing process. The glass should be kept clean during the ﬁ rst two weeks of use to prevent the ﬁ lm from baking on (making it very difﬁ cult to remove). See Glass Cleaning on Page 8.

SAFETY & WARNIING INFORMATION

WARNING

If the information in this manual is not followed exactly, a ﬁ re or explosion may result causing property damage, personal injury or loss of life.

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 from ﬁ re, burns, explosion or carbon monoxide poisoning.

IMPORTANT

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

WARNING

Do not use these appliances if any part has been under water. Immediately call a qualiﬁ ed, 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.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

WARNING

Do not attempt to alter or modify the construction of the appliance or its components. Any modiﬁ cation or alteration may void the warranty, certiﬁ cation 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.

WARNING

These fireplaces are vented heaters. Do not burn wood or other material in these appliances.

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 certiﬁ ed kit is used.

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.

Note: An Optional Screen Heat Guard for the glass is available (see Page 15 for ordering information).

WARNING

OPERATION AND CARE OF YOUR APPLIANCE

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.

B-Vent appliances are not designed to operate in negatively pressured environments (pressure within the home is less than pressures outside). Signiﬁ cant 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

WARNING

injury. Do not operate these appliances in negatively pressured

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

environments. Providing adequate ventilation to the appliance for combustion air will eliminate a negative pressure environment.

WARNING

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

The standard controls for appliance operation are located behind the hinged drop-down panel below the appliance front glass enclosure panel (see Figure 1). Optional control switches are also available (see Page 15 - Remote Wall Switch or Remote Control).

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. Familiarize yourself with the gas control valve that your appliance uses. Refer to Figure 1 for access to the gas control valve.

Millivolt Appliances - Appliances with

Millivolt systems will be ﬁ tted with the gas control valve shown in Figure 2.

Electronic Appliances - Appliances with

electronic systems will be ﬁ tted with the electronic valve shown in Figure 3.

Millivolt Appliances -

To light millivolt appliances refer to the detailed lighting instructions found on Page 18 . Millivolt

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

Gas 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, depress the outer top right corner of the panel until the catch "pops" the door free. Then, gently pull the door forward until the left top corner "pops" free, allowing the panel to swing out and down to open.

On millivolt systems, the piezo igniter, HI/LO ﬂ ame adjustment knob, and pilot and main gas OFF/ON control knob are located below the glass panel enclosure. The gas valve for electronic systems is also located below the glass enclosure panel. See Figure 1.

To ease door closure, depress the catches to place them in their retracted position, then close the door.

OFF/PILOT/ON (gas control knob)

HI/LO (ﬂ ame height

control knob)

OFF/ON Switch

Hinge Pin

Control Compartment Access panel

Note: The gas supply line must be installed in accordance with building codes by a qualiﬁ ed installer approved and/or licensed as required by the locality. In the Commonwealth of Massachusetts, installation must be performed by a licensed plumber or gas ﬁ tter.

Piezo Igniter

Gas Flex Line

Gas Valve

Figure 1 - Gas Control Compartment Access

SIT Millivolt Gas Valve

HI/LO Variable Flame Height Adjustment

T P

TPT H

Pilot Adjustment Screw

Manifold Pressure Tap

Note: The piezo igniter is located below the valve (see Figure 1).

Gas Outlet

Terminals

TPTH,TP & TH

Inlet Pressure Tap

OUT

HI/LO Variable Flame Height Adjustment

Main Gas Control Knob

OFF/PILOT/ON

TPTH TP TH

Gas Inlet

Main Gas

Control Knob

OFF/PILOT/ON

Figure 2

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Millivolt appliances are ﬁ tted with an OFF/ON Rocker Switch located behind the control compartment access panel, below the appliance front glass enclosure panel (see Figure 1 for location). Once the pilot is lit, the OFF/ON rocker switch will control the appliance OFF/ON burner operation. To operate: Toggle the switch between its ON and OFF positions.

If your millivolt appliance is equipped with an optional remote switch kit (wall switch or remote control) and the pilot is lit, the appliance main burner may be turned on and off using the optional switch. When using an optional remote switch, turn off the standard OFF/ON switch.

Note: To prevent excessive resistance in burner circuit (which can cause burner operation problems), only one burner control switch should be wired to valve. Therefore, if an optional control switch is installed, the standard Off/On switch and wires should be removed.

Electronic Appliances -

To light electronic appliances refer to the detailed lighting instructions found on Pagex

19. Electronic appliance lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.

Once the pilot is lit, if your electronic appliance is equipped with an optional burner control switch kit the appliance main burner may be turned on and off using the optional switch (See Optional Accessories on Pagex 15 - wall switch, or remote control Receiver).

Honeywell Electronic Gas Valve

Manifold Pressure Port

Figure 3

I G

N I

T ER

C O N T R

FFO

ON / OFF Switch

Inlet Pressure Port

PSI

Electronic Gas Control Valve

Variable Flame Height Adjustment ( Millivolt Appliances only)

1. All Millivolt appliances are equipped with a

variable gas control valve. Flame height for these models may be adjusted through a range between ﬁ xed low and high settings while the appliance is in operation. Adjust the ﬂ ame height as desired after lighting the appliance by rotating the variable adjustment control knob (HI/LO) located on the front of the valve (refer to Figure 2 ).

2. During the ﬁ rst initial burns of these appli-

ances, there will be some odor emitted (see Burn-In Period on Page 3 ).

3. Keep the lower control compartment clean

by vacuuming or brushing at least twice a year. More frequent cleaning may be required due to excessive lint from carpeting, bedding materials, pet hair, etc. It is very important

that the control compartments, burners and circulating air passageways of the appliance are kept clean.

4. Always turn off gas to the pilot (millivolt

appliances) and let the appliance cool down before cleaning. Before re-lighting, refer to the lighting instructions in this manual. Lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.

5. Always keep the appliance area clear and

free from combustible materials, gasoline and other ﬂ ammable liquids.

6. Remember, Millivolt appliances have a con-

tinuous burning pilot ﬂ ame. Exercise caution when using products with combustible vapors.

VENT OPERATION TEST

A vent operation test is required as part of the installation to verify that proper venting conditions exist and should be done periodically to ensure nothing has changed that would affect proper venting of the appliance.

Procedure:

1. ENSURE APPLIANCE IS OFF (PILOT ONLY) AND COOL.

2. Open both latches on one of the glass enclosure doors and slightly prop it open at the bottom (approx. 1/4” gap). See Figure 6 on Page 9.

3. Turn on all the exhaust fans in the dwelling (and any other appliances which remove air from the dwelling, such as a furnace or clothes dryer, etc.).

4. Ensure that all the doors and windows in the room where the ﬁ replace is located are closed.

5. Light the appliance (see Lighting Instruc- tions, Pages 18 & 19 ). Adjust ﬂ ame height to highest setting and operate for approximately 5-10 minutes. Do not leave appliance unattended.

6. Take a smoke producing device and move it along the bottom edge of the glass door (where it is cracked open). If smoke is drawn into the ﬁ rebox, the vent operation is adequate.

IF THE SMOKE IS NOT DRAWN INTO

THE FIREBOX, TURN THE APPLIANCE OFF AND CALL A QUALIFIED SERVICE TECHNICIAN.

SPILL SWITCH OPERATION

Manual-Reset (safety limit) Spill Switch

This appliance is equipped with a (safety limit) spill switch that is designed to "trip" and discon-

nect the burner circuit if ﬂ ue spillage occurs (because of improper venting of combustion products or vent blockage). If, during appliance operation, the burner ﬂ ame goes out (independently of the burner OFF/ON wall switch), it may be due to the operation of this (safety limit) spill switch. If this switch "trips" it will need to be manually reset by pressing the reset button on switch (see Figure 4 ).

Procedure to Reset (safety limit) Spill Switch

ALLOW APPLIANCE TO COOL COMPLETELY BEFORE ACCESSING AND RESETTING

To access the spill switch:

1. Pull off the top louvered panel.

2. Locate and press the red reset button on the switch (it will click & lock in).

The appliance should then relight and remain lit. If this does not occur, turn off the appliance

and call a qualiﬁ ed service technician.

Press Reset Button on Spill Switch

Remove Top Louvered Panel (or optional radiant panel, if applicable)

Figure 4 - Spill Switch

NOTE: DIAGRAMS & ILLUSTRATIONS 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 outside 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 5. 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 right side of the ﬁ replace 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

and Securing Screw Location

Glass Front

Outside Air Control Lever with Stop Behind

Securing Screw

Inspect Venting System

The appliance and venting system should be thoroughly inspected before initial use and at least annually by a qualiﬁ ed service technician (inspection should include ensuring that exhaust or intake passages are unobstructed and vent components are properly assembled and not damaged). If the venting system is disassembled for any reason, a qualiﬁ ed service technician should follow vent installation instructions for proper reassembly and proper sealing of the venting system components. However, more frequent periodic inspections and cleanings should be

performed by the homeowner.

Clean Lower Control Compartment

Keep lower control compartment clean by vacuuming or brushing it out at least twice a year (also clean the air venturi with a brush or wire). More frequent cleaning may be required due to accumulation of lint from carpeting, bedding materials, pet hair, spider webs, etc. It is very important that

control compartments, burners, circulating air passageways and air venturi on the appliance are NOT obstructed in any way.

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, and pull the outside 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.

The hand operated outside air control lever is located on the right side of the ﬁ replace opening. See Figure 5.

To open the outside air , open the bottom control access panel, reach into the gap between the ﬁ rebox bottom and pull the outside 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.

Operate the actuator through several cycles including the closed position. Ensuring proper operation and freedom of movement. Return the actuator arm to the closed position.

Control Compartment Access Panel

Figure 5

MAINTENANCE

(See Maintenance Schedule, Page 20 )

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.

WARNING

Turn off gas and electrical power before servicing the appliance.

CAUTION

Wear gloves and safety Glasses for protection while doing required maintenance

IMPORTANT

Always verify proper operation after servicing.

Before re-lighting the ﬁ replace, refer to the lighting instructions in this manual. Instructions are also found on pull-out panels located below the glass door in the control compartment.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Cleaning Glass

(see Front Glass Enclosure Panel, Removal and Installation on Page 9 ) Note: Clean glass after

ﬁ rst two weeks of operation (after Burn-In period is over) and then only when necessary and when the ﬁ replace is cool. Wipe surface with clean, dampened, soft cloth. Follow with dry, soft towel as desired. Take care not to scratch the glass surface.

The viewing glass should be cleaned periodically to remove any build-up caused from the following:

IMPORTANT

Do not use abrasive cleaners on glass. Never clean glass when hot.

• During start-up, it is normal for condensation to form on the inside of the glass (this condensation and fog will usually disappear in a few minutes). The moisture can cause lint, dust and other airborne particles to cling to the glass surface.

• Initial curing of the high temperature paint and burning off of lubricants used in the manufacturing process may result in a ﬁ lm on the glass.

• A white coating may form on the glass as a result

of impurities and minerals in the fuel. It is recommended that the glass be cleaned two or three times during each heating season, depending on the circumstances present.

The following cleaning solutions are approved for use to clean glass:

• Non-ammonia based household cleaner

• 50%-50% mix of white vinegar & water

• gas ﬁ replace/stove glass cleaner

Inspect Glass Gasket - Visually inspect the gasket on the backside of the glass enclosure panels. The gasket surface must be clean, free of irregularities and seated ﬁ rmly.

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