Lennox International Inc Indoor Fireplace MPB3328CNE B User Manual

INSTALLATION INSTRUCTIONS

MPB B-Vent

Gas Fireplaces

MODELS

p/N 850033m Rev. G 01/2011

mILLIVOLT:

ELECTRONIC:

This manual is one of a set of two supporting this product.

Refer to P/N 875031M for Care and Operation Instructions.

mpb3328CNm-b mpb3530Cpm-b

mpb3328Cpm-b mpb4035CNm-b

mpb3530CNm-b mpb4540CNm-b

mpb3328CNE-b mpb4035CNE-b

Ce manuel est disponible en francais, simplement

en faire la demande. Numéro de la pièce 850033CF.

mpb3530CNE-b mpb4540CNE-b

Portland

OTL Report No. 116-F-36-5

INSTALLER: Leave this manual with the appliance.

CONSUmER: Retain this manual for future reference.

INSTALLATEUR : Laissez cette notice avec l'appareil.

CONSOmmATEUR : Conservez cette notice pour

consultation ultérieure.

This appliance may be installed in an aftermarket permanently located, manufactured home (USA only) or mobile

home, where not prohibited by local codes. This appliance is only for use with the type of gas indicated on the rating

plate. This appliance is not convertible for use with other gases unless a certiﬁed kit is used.

WARNING AVERTISSEMENT AVISO

• HOT GLASS WILL CAUSE

BURNS.

• UNE SURFACE VITRÉE CHAUDE

PEUT CAUSER DES BRÛLURES.

• LAISSER REFROIDIR LA SURFACE

VITRÉE AVANT D'Y TOUCHER.

• EL VIDRIO CALIENTE

CAUSARÁ QUEMADURAS.

• USTED DEBE NUNCA

• DO NOT TOUCH GLASS

UNTIL COOLED.

TOCAR EL VIDRIO CALIENTE.

• NEVER ALLOW CHILDREN

TO TOUCH GLASS.

• NE PERMETTEZ JAMAIS À UN ENFANT • LOS NIÑOS DEBEN NUNCA

DE TOUCHER LA SURFACE VITRÉE.

TOCAR EL VIDRIO.

WARNING: If the information in these instructions

is not followed exactly, a ﬁre or explosion may

result, causing property damage, personal injury,

or death.

AVERTISSEMENT : Assurez-vous de bien suivre les

instructions données dans cette notice pour réduire au

minimum le risque d’incindie ou d’explosion ou pour

éviter tout dommage matériel, toute blessure ou la mort.

- Ne pas entreposer ni utilizer d’essence ni d’autres vapeurs

ou liquides inﬂammables dans le voisinage de cet appareil

ou de tout autre appareil.

vapors and liquids in the vicinity of this or any other

appliance.

- QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :

• Ne pas tenter d’allumer d’appareil.

- WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any

phone in your building.

• Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

• Ne touchez à aucan interrupteur. Ne pas vous servir des

téléphones se trouvant dans le bâtiment où vous trouvez.

• Appelez immédiatement votre fournisseur de gaz depuis

un voisin. Suivez les instructions du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz,

appelez le service des incindies.

- L’installation et l’entretien doivent être assurés par un

installateur ou un service d’entretien qualiﬁé ou par le

fournisseur de gaz.

•

department.

- Installation and service must be performed by a

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Note: Installation and repair should be done

by a qualiﬁed service person. The appliance

should be inspected before use and at least

annually by a professional service person.

More frequent cleaning may be required

due to excessive lint from carpeting, bed-

ding material, etcetera. It is imperative

that control compartments, burners and

circulating air passageways of the appliance

be kept clean.

The appliance, when installed, must be electri-

cally grounded and wired in accordance with

local codes or, in the absence of local codes,

with the National Electrical Code, ANSI/NFPA

70 - latest edition, or the Canadian Electrical

Code, CSA C22.1 - latest edition.

WARNING

Improper installation, adjust-

ment, alteration, service or

maintenance can cause injury

or property damage. Refer to

this manual. For assistance or

additional information consult

a qualified installer, service

agency or the gas supplier.

Provide adequate clearances around air open-

ings and adequate accessibility clearance for

service and proper operation. Never obstruct

the front openings of the appliance.

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.

Remarque : L’installation et la réparation

devraitêtreconﬁéesàuntechnicienqualiﬁé.

L’appareil devrait faire l’objet d’une inspec-

tion par un technicien professionnel avant

d’être utilisé et au moins une fois l’an par la

suite. Desnettoyagesplusfréquentspeuvent

être nécessaires si les tapis, la literie, et

ceteraproduisentunequantitéimportantede

pous-sière. Il est essentiel que les comparti-

mentsabritantlescommandes,lesbrûleurset

les conduits de circulation d’air de l’appareil

soient tenus propres.

WARNING

Failure to comply with these

installationinstructionswillresult

in an improperly installed and

operating appliance, voiding its

warranty. Anychangetothisappli-

anceand/oritsoperatingcontrols

is dangerous.

These ﬁreplaces are designed as supplemental

heaters. Therefore, it is advisable to have an

alternate primary heat source when installed

in a dwelling.

Outside Combustion Air Hook Up -

(All manufactured home installations require

the use of an Outside Combustion Air Hook-

Up Kit)

do not use these appliances if any part

has been under water. Immediately call a

qualiﬁed, 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.

These appliances are equipped with an integral

combustion air door and actuator arm. Com-

bustion air kits are optional. Install as shown

in Step 7 on Page 15.

WARNING

Clothing or other flammable

material should not be placed

on or near the appliance.

millivolt models - The millivolt appliances are

manually controlled and feature a spark igniter

(piezo) that allows the appliance's pilot gas to

be lit without the use of matches or batteries.

This system provides continued service in the

event of a power outage.

Nepasutilisercetappareils’ilaétéplongé,

même partiellement, dans l’eau. Ap-

peler un technicien qualiﬁé pour inspecter

l’appareil et remplacer toute partie du

systèmedecommandeettoutecommande

qui a été plongée dans l’eau.

AVERTISSEmENT

On ne devrait pas placer de

vêtements ni d’autres matières

inﬂammables sur l’appareil ni à

proximité.

Millivoltmodelscomestandardwithamanually-

modulated gas valve; ﬂame appearance and

heat output can be controlled at the gas valve.

The BTU Input for these appliances is shown

in Table 1.

Only trim kit(s) supplied by the manufacturer

shall be used in the installation of this ap-

pliance.

WARNING

Seules les trousses de garniture fournies

par le fabricant doivent être utilisées pour

l’installation de cet appareil.

millivolt models with

Any safety screen or guard

removed for servicing the appli-

ance must be replaced prior to

operating the appliance.

manually-modulated Gas Valve

Natural Gas

propane Gas

TheseappliancescomplywithNationalSafetyStan-

dards and are tested and listed by OMNI-Test

Laboratories, Inc. (Report No. 116-F-36-5) to

ANSI Z21.50 (in Canada, CSA 2.22), and CAN/

CGA-2.17-M91 in both USA and Canada, as

vented gas ﬁreplaces.

model

Input Rate

(bTU/HR)

Input Rate

(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

mpb3328

mpb3530

mpb4035

mpb4540

AVERTISSEmENT

Tout écran ou protecteur retiré

pour permettre l’entretien de

l’appareil doit être remis en

place avant de mettre l’appareil

en marche.

bothmillivoltandelectronicversionsofthese

appliances are listed by OmNI-Test Laborato-

ries, Inc. for installation in bedrooms in the

United States (not approved in Canada) and

in manufactured Homes.

Table 1

misc. Codes / Standards -

WARNING

TheInstallationmustconformtolocalcodesor,

in the absence of local codes, with the National

Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest

edition(InCanada,thecurrentCAN/CSA-B149.1

installation code).

Improper installation or use of

thisappliancecancauseserious

injury or death from ﬁre, burns,

explosion or carbon monoxide

poisoning.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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Gas Valve diagrams

See Figure 1 for Millivolt models and Figure 2

For Electronic Models.

Electronicmodels-Theseelectronicappliances

have a ﬁxed rate gas valve and an electronic

intermittent pilot ignition system. External

electrical power is required to operate these

units. The BTU Input for these appliances is

shown in Table 2.

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).

HI/LO Variable

Flame Height

Adjustment

Inlet pressure Tap

manifold pressure Tap

Theseappliancesandtheirindividualshut-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).

Electronic models with

Fixed-Rate Gas Valve

O U T I N

Natural Gas

propane Gas

model

Input Rate

(bTU/HR)

Input Rate

(bTU/HR)

17,500

20,000

30,000

31,000

17,500

20,000

28,000

29,000

mpb3328

mpb3530

mpb4035

mpb4540

Table 2

These appliances must not be connected to a

chimney or ﬂue serving a separate solid fuel

burning appliance.

main Gas

pilot Adjustment

Control Knob

Oriﬁce Sizes - Sea Level to High Altitude

(All models)

Screw

OFF/pILOT/ON

Figure 1 - SIT Millivolt Gas Valve

These appliances are tested and approved for

installation at elevations of 0-4500 feet (0-1372

meters) above sea level using the standard

burneroriﬁcesizes(marked with an "*" in Table

5). Forelevationsabove4500feet,contactyour

gas supplier or qualiﬁed service technician.

Gas pressure - All models

manifold pressure ON / OFF Switch

Tables 3 and 4 show the appliances' inlet and

manifold gas pressure requirements:

port

Inlet

pressure

deration - At higher elevations, the amount

of BTU fuel value delivered must be reduced

by either:

port

Inlet Gas Supply pressure

(all models)

•

Using gas that has been derated by the gas

company.

Fuel #

minimum

maximum

5.0" WC

(1.24 kpa)

10.5" WC

(2.61 kpa)

•

Changing the burner oriﬁce to a smaller size

as regulated by the local authorities having

jurisdiction and by the (USA) National Fuel

Gas Code NFPA 54/ANSI Z223.1 - latest

edition or, in Canada, the CAN/CSA-B149.1

codes - latest edition.

Natural Gas

11.0" WC

(2.74 kpa)

13.0" WC

(3.23 kpa)

Electronic Gas

Control Valve

propane

Table 3

Figure 2 - Honeywell Electronic Gas Valve

Installtheapplianceaccordingtotheregulations

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 CAN/CSA-B149.1 - latest edition.

manifold Gas Supply pressure

(all models)

REQUIREmENTS FOR THE COmmON-

WEALTH OF mASSACHUSETTS

Fuel #

Low

(millivolt only)

High

NOTE: Flame appearance will diminish 4% per

thousand feet.

Installation of these ﬁreplaces are approved

for installation in the US state of Massachu-

setts if the following additional requirements

are met:

• Install this appliance in accordance with

Massachusetts Rules and Regulations 248

C.M.R. Sec. 5.08 2(a) through 2(e).

• Installation and repair must be done by a

plumber or gas ﬁtter licensed in the Com-

monwealth of Massachusetts.

• The ﬂexible gas line connector used shall

not exceed 36 inches (92 centimeters) in

length.

• The individual manual shut-off must be a

T-handle type valve.

Natural (Lo) 2.2" WC

(Hi) 3.5" WC

(0.87 kpa)

Gas

(0.55 kpa)

(Lo) 6.3" WC (Hi) 10.0" WC

(1.57 kpa) (2.49 kpa)

propane

burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Table 4

model

Nat.Gas

propane

Series

drill size (inches)

MPB-3328

MPB-3530

#47 (.0785") *

39L66 •

#1.2m (.048")*

99K78 •

Test gauge connections are provided on

the front of the millivolt gas control valve,

identiﬁed IN for the inlet and OUT for the

manifold side. A 1/8" NPT Test gauge connec-

tion is provided at the inlet and outlet side of

the electronic gas control valve adjacent to the

outlet to the main burner.

#44 (.086") *

60J80 •

#55 (.052") *

19L52 •

MPB-4035

MPB-4540

#37 (.104") *

24m10 •

1/16" (.0625") *

21L01 •

NEW YORK CITY, NEW YORK (mEA)

#36 (.1065") *

18L40 •

#52 (.0635") *

Propane tanks are at pressures that will cause

damage to valve components. Verify that the

tanks have step down regulators to reduce the

pressure to safe levels.

37G00 •

Installation of these ﬁreplaces are approved for

installation in New York City in the US state of

New York (approval no. MEA 417-05-E), if the

following additional requirements are met -

• An outside air kit (FOAK-4 or FOAK-4LD)

must be installed. See Figure 22 on Page

16.

* Standard size installed at factory

• Part /Cat. Number

Table 5

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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COLd CLImATE INSULATION

For cold climate installations, seal all cracks

around your appliance with noncombustible

material and wherever cold air could enter

the room. It is especially important to insulate

outside chase cavity between studs and under

ﬂoor on which appliance rests, if ﬂoor is above

ground level. Gas line holes and other open-

ings should be caulked or stuffed with unfaced

ﬁberglass insulation.

Vertical

Venting

Shown with Outside Air Kit

installed (model FOAK-4 or

FOAK-4Ld)

If the ﬁreplace is being installed on a cement

slab in cold climates, a sheet of plywood or

otherraisedplatformcanbeplacedunderneath

to prevent cold transfer to the ﬁreplace and into

the room. It also helps to sheetrock inside

surfaces and tape for maximum air tightness

and caulk ﬁrestops.

Offset

Venting

mANUFACTUREd HOmE

REQUIREmENTS

Note: When the unit is installed with one side ﬂush

with a wall, the wall on the other side of the unit must

not extend beyond the front edge of the unit.

Thisappliancemaybeinstalledinanaftermarket

permanently located, manufactured home and

must be installed in accordance with the manu-

facturer's instructions and the Manufactured

Home Construction and Safety Standard, Title

24 CFR, Part 3280, in the United States, or the

StandardforInstallationinMobileHomes,CAN/

CSA Z240 MH Series, in Canada.

Figure 3 - Typical Installations

Be aware that this is a heat producing ap-

pliance. Objects placed above the unit are

exposed to elevated temperatures.

LOCATION

Cetappareilpeutêtreinstallécómmedumatéri-

eld'originedansunemaisonpréfabriquée(É.U.

seulement) ou mobile et doit être installé selon

les instructions du fabricant et conformément

à la norme Manufactured Home Constructions

and Safety, Title 24 CFR, Part 3200 aux Unis ou

à la norme Can/CSA-Z240 Série MM, Maisons

mobiles au Canada.

In selecting the location, the aesthetic and

functional use of the appliance are primary

concerns. However, vent system routing to

the exterior and access to the fuel supply are

also important.

do not insulate the space between the appli-

ance and the area above it.

The appliance should be mounted on a fully

supported base extending the full width and

depth of the unit. The appliance may be located

onornearconventionalconstructionmaterials.

However, if installed on combustible materials,

such as carpeting, vinyl tile, etc., a metal or

woodbarriercoveringtheentirebottomsurface

must be used.

Due to high temperatures, the appliance

should be located out of trafﬁc and away from

furniture and draperies (Figure 3).

Thisapplianceisonlyforusewiththetypeofgas

indicated on the rating plate. This appliance is

notconvertibleforusewithothergases, unless

a certiﬁed kit is used.

Enraisondestempératuresélevées,l’appareil

devrait être installé dans un endroit où il y a

peu de circulation et loin du mobilier et des

tentures (Figure 3).

Cet appareil doit être utilisé uniquement avec le

type de gaz indiqué sur la plaque signalétique.

Cetappareilnepeutêtreconvertiàd'autresgaz,

sauf si une trousse de conversion est utilisée.

The location should also be free of electrical,

plumbing or other heating/air conditioning

ducting.

CAUTION: Ensure that the cross mem-

bers are not cut or weakened during

installation. The structural integrity of

the manufactured home ﬂoor, wall, and

ceiling / roof must be maintained.

CAUTION: This appliance must be ground-

ed to the chassis of the manufactured

home in accordance with local codes or

in the absence of local codes, with the

National Electrical Code ANSI / NFpA 70

- latest edition or the Canadian Electrical

Code CSA C22.1 - latest edition.

Notes:

• An Outside Combustion Air Hook-Up Kit

must be installed (see Step 7, Page 15).

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VENT TERmINATION CLEARANCES

Termination Heights For Vents

Above Flat Or Sloped Roofs

Ref. NFpA 54 / ANSI Z223.1, 7.6

Gas Vent Rule - Gas vent caps are not per-

mitted within 8 feet (2.4 mm) of a vertical wall

or similar obstruction. Gas vent caps that are

located 8' or more from a portion of a building

which extends at an angle greater than 45°

upward from the horizontal may terminate in

accordancewith(Figure4), providedthatinno

case shall any discharge opening on the cap be

lessthan2'(610mm)horizontallyfromtheroof

surface (National Fuel Gas Code ANSI Z223.1

(NFPA 54) 7.6.2) (CAN/CGA B149).

Roof pitch

Feet

1.0

meters

0.3

Flat to 6/12

6/12 to 7/12

1.25

1.5

2.0

2.5

3.25

4.0

5.0

6.0

7.0

7.5

8.0

0.38

0.46

0.61

0.76

0.99

1.22

1.52

1.83

2.13

2.29

2.44

Roof pitch is X/12

7/12 to 8/12

8/12 to 9/12

minimum Height from Roof to

Lowest discharge Opening

9/12 to 10/12

10/12 to 11/12

11/12 to 12/12

12/12 to 14/12

14/12 to 16/12

16/12 to 18/12

18/12 to 20/12

20/12 to 21/12

1“ (25 mm)

minimum

multiple Terminations

These appliances may vent adjacent to and at

the same level with any other gas appliances

(includingdirect-ventappliances)providedthat

thereisatleast2ft.(0.6m)betweentheproximal

edges of the vent caps. These appliances may

be vented adjacent to a chimney vent servicing

a solid fuel ﬁreplace provided the B-vent cap

is at least 2 ft. (0.6m) away from the nearest

point of the chimney opening.

Figure 4 - Vertical Vent Termination Clearances

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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mINImUm CLEARANCES TO COmbUSTIbLES

MANTEL CLEARANCES

Inches (mm)

Appliance And Vent Clearances

12 (305) MANTEL

Maintain clearances from appliance to combustible materials as detailed

in Table 6 with the following exception: When the unit is installed with

one side ﬂush with a wall, the wall on the other side of the unit must

not extend beyond the front edge of the unit. In addition, when the unit

is recessed, the side walls surrounding the unit must not extend beyond

the front edge of the unit (see Figure 3).

10 (254) MANTEL

8 (203) MANTEL

6 (152) MANTEL

4 (102) MANTEL

(356)

(305)

(254)

TOP OF

APPLIANCE

2 (51) MANTEL

(203)

(152)

mINImUm CLEARANCES

(102)

Inches (millimeters)

back

Sides

1/2 (13)

0 (0)

NOTE - Hood shown as positioned

in louvered front model. The hood

position in the flush faced front model

is lower than shown.

Top Spacers

Floor

*Note - The side walls of mantels may protrude

beyond the front face of the fireplace a maximum

of 5 inches (127mm) at 0 inch clearance to the

sides of the fireplace.

0 (0)

bottom of Appliance

64 (1626)

To Ceiling

Vent

1 (25.4)

Figure 5 - Minimum Mantel Clearances

SERVICE CLEARANCES Feet (meters)

Front

3 ft. (0.9 m)

Table 6

0” Clearance

to Combustible

Side Wall

Ceiling

Hearth Extension - A hearth extension is not required with this appliance.

Ifahearthextensionisused,donotblockthecontrolcompartmentaccess

panel.Anyhearthextensionusedisforappearanceonlyanddoesnothave

to conform to standard hearth extension installation requirements.

Wall Finishes / Surrounds / mantels

Note: Combustible wall ﬁnish materials and/or surround materials must

not be allowed to encroach the area deﬁned by the appliance top spacers.

Never allow combustible materials to be positioned in front of or overlap-

ping the appliance front face and top spacers. See Figure 38.

64 in.

(1626 mm)

Non-combustible materials, such as surrounds and other appliance trim,

may be installed on the appliance front face with these exceptions: The

material must NOT cover any portion of the glass or louvers.

Vertical installation clearances to combustible mantels vary according to

the depth of the mantel (refer to Figure 5). Mantels constructed of non-

combustible materials may be installed at any height above the appliance

opening; however, do not allow anything to hang below the hood.

bottom of Fireplace

These instructions should be used as a guideline and do not supersede

local codes in any way.

Figure 6

*Note: See Figures 7 and 8 on Page 8 for clearance requirements to

the nailing ﬂange located at each side of the unit and any screw heads

adjacent to it.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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Step 7. (Page 15) Outside Air Kit Installa-

tion.

Side Nailing Flanges

WARNING

Step 8. (Page 16) Verify appliance opera-

tion.

The ﬁreplace should be secured to the side

framing members using the unit's nailing

ﬂanges - two at the top and bottom on each

side of the ﬁreplace front. See Figure 7. Use

8d nails or their equivalent.

Failure to position the parts in

accordance with these diagrams

orfailuretouseonlypartsspeciﬁ-

callyapprovedwiththisappliance

may result in property damage or

personal injury.

Step 9. (Page 16) Install grate, vermiculite,

embers and logs.

Step 10. (Page 21) Installation/Removal of

glass enclosure panels.

Step 11. (Page 22) Adjust burner primary

air shutter to achieve proper ﬂame

appearance.

Floor Nailing Tabs

Step 12. (Page 23) Vent operation test and

(safety limit) switch operation.

Step 13. (Page24)Installthedecorativetrims

and hoods.

Fireplacemaybeanchoredtoﬂoor. Benddown

two anchor tabs (one on each side) located

at the base of the ﬁreplace and secure to the

ﬂoor by nailing with 8d nails or equivalent

(Figure 8).

AVERTISSEmENT

Risque de dommages ou de

blessures si les pièces ne sont

pas installées conformément à

ces schémas et ou si des pièces

autres que celles spéciﬁquement

approuvéesaveccetappareilsont

utilisées.

Step 14. (Page25)AttachSafetyinOperation

Warnings.

Step 1. FRAmING

Frame these appliances as illustrated in Figure

9. Allframingdetailsmustallowforaminimum

clearance to combustible framing members as

shown in Table 6 on Page 7.

Unit Nailing Flange

Side

(No clearance to

combustible

Framing

framing is required)

dETAILEd INSTALLATION STEpS

If the appliance is to be elevated above ﬂoor

level, a solid continuous platform must be

constructed below the appliance.

The appliance is shipped with all gas controls

and components installed and pre-wired.

Left Side Front Corner of Fireplace Shown

(Right Side Requirements the Same)

Note: The framed depth, 16 in. (406 mm) from

a framed wall, must always be measured from

a ﬁnished surface. If a wall covering such as

drywall is to be attached to the rear wall, then

the 16 in. (406 mm) must be measured from

the drywall surface. It is important that this

dimension be exact.

Unit being Secured by Its Nailing Flanges

1.Remove the shipping carton. Remove the

shipping pad, exposing the front glass

door.

2.Open the two latches (located under the ﬁre-

box ﬂoor) securing the glass door. Remove

the door by tilting it outward at the bottom

andliftingitup. Setthedoor asideprotecting

it from inadvertent damage. See Removing

Glass Enclosure Panel on Page 21.

To The Framing

Note: The nailing flanges, combustible members

and screw heads located in areas directly adjacent

to the nailing flanges, are EXEmpT from the 1/2”

clearance to combustible requirements for the

firebox outer wrapper. Combustible framing may be

in direct contact with the nailing flanges and may

be located closer than 1/2” from screw heads and

the firebox wrapper in areas adjacent to the nailing

flanges. Frame the opening to the exact dimensions

specified in the framing details of this manual.

Headers may be in direct contact with the

appliance top spacers but must not be sup-

ported by them or notched to ﬁt around them.

All construction above the appliance must be

self-supporting, dO NOT use the appliance for

structural support.

Figure 7

TYpICAL INSTALLATION SEQUENCE

The typical sequence of installation is outlined

below. However, each installation is unique

and may result in variations to the steps

described.

pre-installation Notes

The ﬁreplace may be positioned and then the

framing built around it, or the framing may be

constructed and the ﬁreplace positioned into

the opening.

Anchor

Tab

See the Page numbers references in the follow-

ing steps for detailed procedures.

Usually, no special ﬂoor support is needed for

the ﬁreplace, however, to be certain:

Step 1. (Page 8) - Construct the appliance

framing. Position the appliance

within the framing and secure with

nailing ﬂanges.

1. Estimate the total weight of the ﬁreplace

system and surround materials such as

brick, stone, etc., to be installed.

2. Measurethesquarefootageoftheﬂoorspace

tobeoccupiedbythesystem,surroundsand

hearth extensions.

Step 2. (Page 11) Route gas supply line to

appliance location.

Note:

Step 3. ( Page12)Installtheventsystemand

exterior termination.

Some units only have one anchor tab on each side.

3. Note the ﬂoor construction, i.e. 2 x 6’s, 2 x

8’s or 2 x 10’s, single or double joists, type

and thickness of ﬂoor boards.

Figure 8

Step 4. (Page 13) Field Wiring

a. Millivolt Appliances – Install the

OFF/ON burner control switch.

b. Electronic Appliances – Connect

120VACelectricalpowertotheappli-

ance receptacle.

4. Use this information and consult your local

building code to determine if you need ad-

ditional support.

Step 5. (Page 14) Install the optional

blower.

Step 6. (Page 14) Make connection to gas

supply.

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FRAmING SpECIFICATIONS

Back Wall of Chase/Enclosure

Including Finishing Materials

if any

*Optional FOAK

Outside

Air Kit

Header

Rough Framing Face

(Unfinished Shown)

Outside Chase

back Wall of Chase/Enclosure

Including Finishing materials

if any

Fireplace Framing

back Wall of Chase/Enclosure

Including Finishing materials

if any

Rough

Framing Face

(Unfinished Shown)

Inside Chase

Rough

Framing Face

(Unfinished Shown)

Corner Installation

Note: All framing dimensions calculated for 1/2" dry wall at the appliance face. If sheathing the chase or ﬁnishing with other thickness

materials, calculations will need to be made.

* Outside air kit - FOAK (without adapter). See Figure 22 on Page 16.

Unit

Size

Model No.

Framing

Size

33-1/8

842

11-1/4

286

48-1/2

1232

24-1/4

616

34-5/16

872

in.

33-1/4

845

4-1/16

103

21-1/2

546

33-1/4

845

MPB3328

330

102

12-3/4

19-5/8

498

324

7-1/16

6-9/16

167

179

6-9/16 43-11/32

7-1/16

24-7/8

in.

35-1/8

892

40-1/8

1019

40-1/8

45-1/8

1146

35-1/4

895

40-1/4

1022

45-1/4

1149

35-1/4

895

57-1/2

1460

28-3/4

730

30-11/16

779

33-3/16

843

406

102

40-5/8

1032

MPB3530

MPB4035

MPB4540

40-1/4 29

7/8 1

-1-5

16 61-13/16 30-1/16

1022

40-1/4

1022

610

625

1570

66-3/8

1686

1101

6-9/16 46-15/16

167 1192

759

373

7-1/16

179

29-5/8

34-7/8 17-3/16

610 752

886

437

406

102

Figure 9

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FRAMING

SPACERS

(Top and Sides

and Rear)

FIREpLACE SpECIFICATIONS

Flue Outlet For B-Vent Connection

NOTE - Hood shown

ELECTRICAL INLET

2-3/4 x 2 (70 x 51) COVER

PLATE with KNOCKOUT)

Top View

as positioned

in louvered

front model.

ELECTRICAL INLET

3 (76)

(See Also

Right Side View)

1/2(13)

GAS INLET

(Either Side

and bottom)

5-1/2

(140)

OUTSIDE AIR

SHUTTER

5-1/2

(140)

OPTIONAL ELECTRICAL

INLET KNOCKOUT

REQUIRING A FIELD

PROVIDED JUNCTION

BOX (Either Side)

9-3/8

(238)

9-3/8

(238)

GAS INLET

(See Also

Right Side View)

8-15/16

(227)

(53)

(76)

1-3/8

(35)

3 (76)

ELECTRICAL

INLET

(Optional)

1³⁄₈

(35)

7-3/8

(187)

Left Side View

Front View

Right Side View

Model No.

33-1/8

841

21-1/2

in.

30-1/8

765

432

33-1/8

841

10-3/4

273

6-1/2

27-1/2

699

MPB3328

546

24-7/8

- /8 12

102

165

8-3/4

222

8-3/4

222

330

406

in.

35-1/8 32-1/8

892 816

40-1/8 37-1/8

1019 943

40-1/8 37-1/8

1146 943

483

610

29-1/2 35-1/8

749 892

34-1/2 40-1/8 29-7/8 14-15/16

876 1019 759 379

39-1/2 45-1/8 34-7/8 17-7/16

1003 1146 886 443

127

MPB3530

316

in.

MPB4035

in.

8-3/4

222

MPB4540

Figure 10

610

152

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Never use galvanized or plastic pipe. Refer

to Table 7 for proper sizing of the gas supply

line, if black iron pipe is being used. Gas lines

must be routed, constructed and made of

materials that are in strict accordance with

local codes and regulations. We recommend

that a qualiﬁed individual such as a plumber

or gas ﬁtter be hired to correctly size and route

the gas supply line to the appliance. Installing

a gas supply line from the fuel supply to the

applianceinvolvesnumerousconsiderationsof

materials,protection,sizing,locations,controls,

pressure,sediment,andmore.Certainlynoone

unfamiliarandunqualiﬁedshouldattemptsizing

or installing gas piping.

Notes:

Step 2. ROUTE GAS SUppLY LINE

• All appliances are factory-equipped with a

ﬂexiblegaslineconnectorand1/2inchshutoff

valve (see Figure 20 on Page 15).

Route a 1/2" (13 mm) gas line as shown in

Figure 11. Gas lines must be routed, con-

structed and made of materials that are in strict

accordance with local codes and regulations.

The appliance, as set up at the factory, is best

suited for use with a gas line routed from the

right side. The gas line may however be alter-

nately routed from the left side. All appliances

are factory-equipped with a ﬂexible gas line

connector and 1/2 inch shutoff valve. (See

Step 6 on Page 14).

• SeeMassachusettsRequirementsonPage4

for additional requirements for installations in

the state of Massachusetts in the USA.

• The gas supply line should Not be connected

to the appliance until Step 6 (Page 14).

• A pipe joint compound rated for gas should be

used on the threaded joints. Ensure propane

resistant compounds are used in propane

applications. Be very careful that the pipe

compound does not get inside the pipe.

• It is recommended to install a sediment trap

in the supply line as close as possible to the

appliance(seeFigure20,Page15). Appliances

using propane should have a sediment trap at

the base of the tank.

Right Side Front

CornerofFireplace

Framing

Schedule 40 (black iron) pipe

Inside diameter (Inches)

Also see

Figure 10

• Checkwithlocalbuildingofﬁcialforlocalcode

requirements(i.e.arebelowgradepenetrations

of the gas line allowed?, etc).

Schedule 40 pipe

Length (feet)

Natural

Gas

propane

Gas

0-10

10-40

1/2

3/4

3/8

1/2

IMPORTANT:Ifpropaneisused, beawarethat

if tank size is too small (i.e. under 100-lbs, if

this is the only gas appliance in the dwelling.

Ref. NPFA 58), there may be loss of pressure,

resulting in insufﬁcient fuel delivery (which

can result in sooting, severe delayed ignition

or other malfunctions). Any damage resulting

from an improper installation, such as this, is

not covered under the limited warranty.

(76 mm)

6 1/2"

(152 mm)

40-100

100-150

150-200

Table 7

Figure 11 - Route Gas Line

proper Sizing of Gas Line

Properly size and route the gas supply line

from the supply regulator to the area where

the appliance is to be installed per require-

ments outlined in the National Fuel Gas Code,

NFPA 54 - latest edition (USA) or B149 - latest

edition (Canada).

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Step 3. INSTALL THE VENT SYSTEm &

EXTERIOR TERmINATION:

General Information

Offset

Installations

These instructions should be used as a

guideline and do not supersede local codes

in any way. Install venting according to local

codes,theseinstructions,thecurrentNational

Fuel Gas Code (ANSI-Z223.1) in the USA or

the current standards of CAN/CSA-b149.1

in Canada.

Vertical

Installations

*12 ft. min.

10 ft.

**15 ft. min.

minimum

Ensure clearances are in accordance with

local installation codes and the requirements

of the gas supplier.

back View

Of Appliance

back View

Of Appliance

dégagementconformeauxcodesd'installation

locaux et aux exigences du foumisseunde

gaz.

*with an offset up to 45 degrees

** with an offset greater than 45

degrees and up to 60 degrees

The maximum overall height of the vent system

and appliance should not exceed 40 feet.

Use only approved venting components.

See Approved Vent Components on

Page 2.

Figure 13

These ﬁreplaces must be vented directly

to the outside.

USE ONLY AppROVEd b-VENT dIAmETER

CAUTION

Thisappliancecannotbevented

horizontally.

SliptheﬁrstsectionofB-Ventover theﬁreplace

ﬂue outlet and secure with four sheetmetal

screws(#8orlarger),andinstalltheremainder

of the B-Vent to the outside. Minimum overall

height of the vent system and appliance must

be 10' (2.54 m) vertical - no offset (see Figure

13); or 12' (3.7 m) when an offset up to 45

degrees from the vertical is used: or 15' (4.6

m) when an offset is greater than 45 degrees

and up to 60 degrees.

mpb-3328, mpb-3530, mpb-4035 and mpb-

4540 series ﬁreplaces must be vertically

vented using listed type-b, double-walled

vent pipe with the proper diameter as listed

below and a listed vent termination.

Note: Refer to the vent manufacturers instal-

lation instructions for variations of venting

techniques. If common venting of several units

is contemplated, it should be discussedwith an

architect and the local Building Department.

Required pipe diameter:

mpb-3328 series: Requires 4 in. (102 mm)

mpb-3530 series: Requires 5 in. (127 mm)

mpb-4035 series: Requires 5 in. (127 mm)

mpb-4540 series: Requires 6 in. (152 mm)

The offset may start at the ﬁreplace ﬂue collar

(see Figure 13). The maximum overall height

of the vent system and appliance should not

exceed 40 feet.

do not place insulation materials within 1 in.

of the gas vent system.

Install the B-vent system in accordance with

the vent manufacturer's instructions.

Type b-Vent - 4 in. (102 mm) for mpb 3328 models,

5 in. (127 mm) for mpb 3530 / 4035 models or 6 in.

(153 mm) for mpb 4540 models

Securing

Screws

Flue Outlet

Collar

Figure 12

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b. Electronic Wiring (See Figures 17 or 18) –

Step 4. FIELd WIRING

A. SIT millivolt Wiring

(See Figure 14) –

Note: The electronic appliance must be con-

1. Select anyofthefollowingoptionalcontrols:

appliance-mounted (rocker switch) or wall-

mounted switch, thermostat, or one of the

optional remote control kits. If appliance-

mounted ON/OFF control is selected mount

it in the gas valve mounting bracket.

nected to the main power supply.

CAUTION

A junction box is located at the rear of the con-

trol compartment on either side of the cabinet.

The junction box on the right side contains a

factory installed and wired outlet box (duplex

receptacle). Also, an optional ﬁeld-provided

junction box with receptacle may be installed at

the front of the control compartment on either

side of the cabinet. See Figure 15. It will be

held in place by a conduit ﬁtting and locknut

(ﬁeld-provided).

Ground supply lead must be con-

nected to the wire attached to the

green ground screw located on

the outlet box. See Figures 17 or

18. Failure to do so will result in a

potential safetyhazard. Theappli-

ancemustbeelectricallygrounded

in accordance with local codes or,

in the absence of local codes, the

National Electrical Code, ANSI/

NFpA 70-latest edition. (In Canada,

the current CSA C22-1 Canadian Elec-

trical Code).

2. If wall-mounted ON/OFF control switch or

thermostat is selected mount it in a conve-

nient location on a wall near the ﬁreplace.

3. Wire the control switch within the millivolt

control circuit using the 15 feet of 2 conduc-

tor wire supplied with the unit . Caution: do

not connect the optional wall switch to a

120V power supply.

1. Route a 3-wire 120Vac 60Hz 1ph power

supply to the appliance junction box.

4. Alternatively, theappliancemaybeoperated

without the use of the controls indicated

in Instruction #1, solely by manipulating

the gas valve control knob. In order to use

this method, twist the free ends of the two

conductor wire (located in the lower com-

partment of the unit) together as shown in

Figure 14.

See Figure 10 on Page 10

for Optional Electrical Inlet

Knockout Location.

CAUTION: Label all wires prior to disconnec-

tionwhenservicingcontrols.Wiringerrorscan

cause improper and dangerous operation.

* Field-provided

Junction box and

duplex Receptacle

* Narrow (2-1/8 Inch Wide)

J-box Required

ATTENTION: Au moment de l'entretien des

commandes, étiquetez tous les fils avant de

les débrancher. des erreurs de cáblage peu-

vent entraîner un fonctionnement inadéquat

et dangereux.

Optional J-box/Outlet box

Note: The supplied 15 feet of 2 conductor wire

has one end of each conductor connected to

the gas valve circuit and the other end of each

conductor placed inside the control compart-

ment.

(Left Side Shown)

Figure 15

Verify proper operation after servicing.

120V, 60HZ, 1PH

* Wall-mounted

S'assurer que l'appareil fonctionne adé-

quatement une fois l'entretien terminé.

ON/ OFF Blower

SIT Millivolt Wiring Diagram

If any of the original wire as supplied must be replaced,

it must be replaced with Type AWM105°C – 18 GA. wire.

Switch or Variable

Speed Control Switch.

CAUTION: dO NOT CONNECT OpTIONAL CON-

TROL SWITCH TO 120 V pOWER SUppLY.

CAUTION: REmOVE THE CARTON SUppORT

FROmTHECONTROLCOmpARTmENTbEFORE

OpERATING THE AppLIANCE.

Junction Box

CAUTION: ENSURE THAT WIRES ARE pOSI-

TIONEd AWAY FROm HOT SURFACES ANd

SHARp EdGES.

Thermopile

Tab

Broken

Hot

Refer to Section A for millivolt appliances and

Section B for electronic appliances. The gas

valve is set in place and pre-wired at the factory

on both models.

Side of

*OPTIONAL ON/OFF SWITCH,

WALL SWITCH, THERMOSTAT

OR REMOTE CONTROL RECEIVER

Red

Black

Receptacle

*TWIST WIRES “A” AND “B” TOGETHER TO OPERATE UNIT

SOLELY BY MANIPULATING THE GAS VALVE CONTROL KNOB;

OR CONNECT WIRES TO OPTIONAL ON/OFF SWITCH OR WALL

SWITCH OR THERMOSTAT OR REMOTE CONTROL RECEIVER

TO OPERATE UNIT.

Neutral

Side of

Receptacle

Schematic Representation Only

Figure 14

Plug blower

Tab Intact

into this

Green

Ground

Screw

receptacle

Blower

Field Wired

Factory Wired

Ground

Figure 16: Junction Box Wiring

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2. Ifthefactory-providedoutlet/junctionboxat

the right rear of the ﬁreplace is being used,

remove the outlet box from the junction box

by removing two screws.

Step 6. CONNECTING GAS LINE

Electronic Wiring Diagram (Honeywell)

Showing the Blower Wiring for the Optional

FBK-100 and FBK-200 Kits

1. If any of the original wire as supplied must be replaced,

1. it must be replaced with Type AWM 105°C – 18 GA. wire.

2. 120V, 60Hz – Less than 3 amps.

All codes require a shut-off valve mounted

in the supply line. The orientation of the

shut-off valve should face the front. Figure

20 illustrates two methods for connecting the

gas supply. A Sediment Trap is recommended

to prevent moisture and debris in gas line from

damaging the valve.

3. Connect the power supply wires (includ-

ing the ground supply wire) as shown in

Figures 17 and 18. (If the ﬁeld-provided

J-box/outlet box is being used, all of the

outlet box wiring must be ﬁeld-provided).

4. Locate and install a low voltage (24V)

wall-mounted switch or thermostat (both

ﬁeld-provided) in the desired location.

5. Connect the low voltage wire, located in

the lower control compartment, to the wall-

mounted switch or thermostat.

Note:Thesupplied15feetof2conductorwire

has one end of each conductor connected

to the gas valve circuit and the other end of

each conductor placed inside the control

compartment.

6. Insert the control circuit plug into the un-

switched receptacle of the outlet box.

7. After wiring is complete, mount the outlet

box to the J-Box.

Note: Thegasvalve-mountedON/OFFswitch

is shown in Figures 17 and 18. It is integral

with the gas valve and should be set to the

ON position.

**Leave the ON/OFF switch, which is integral

with the gas valve, in the ON position.

**ON/OFF Switch (Integral

with Gas Valve)

*OPTIONAL

ACCESSORY

SWITCH

Gas Valve

PILOT

ASSEMBLY

The ﬂex-line method is acceptable in the U.S.A.

where local codes permit, however, Canadian

requirementsvarydependingonlocality.Instal-

lation must be in compliance with local codes.

These appliances are equipped with a gas ﬂex-

lineforuseinconnectingtheunittothegasline.

See Figure 20 for ﬂex-line description. The

ﬂex-line is rated for both natural and propane

gas. A manual shut off valve is also provided

with the ﬂex-line.

120

VAC.

Outlet Box

Green Ground

Screw

OPT

BLOWER

Red

pigtail

Break Off

Tab

Black

pigtail

White Wire

to Opposite

Side

Junction Box

Transf.

120 V.

Hot side of Outlet

The gas control valve is located in the lower

control compartment.

24 V

To access the valve open the lower control

compartment door (see Figure 19).

The millivolt control valve has a 3/8" (10mm)

NPT thread inlet port. The electronic control

valve has a 1/2" (13 mm) NPT thread inlet

port and is ﬁtted with a 1/2" x 3/8" (13 mm x

10mm) NPT ﬁtting.

OPTIONAL WALL SWITCH

OR OPTIONAL THERMOSTAT OR

OPTIONAL REMOTE RECEIVER

LIMIT SWITCH

*Blower speed control switch is provided in FBK200 blower kit.

Factory Wired

Field Wired

Schematic Representation Only

Figure 17

Step. 5 WIRING - OpTIONAL FORCEd

AIR bLOWER KIT

Open the lower panel or louver assembly by

pushing in the right side of the panel or louver

assembly and then lowering it forward and

down.

FbK-100, FbK-200 and FbK250 Kits

(See Figure 17 for FBK-100, FBK-200 and

Figure 18 for FBK-250 wiring) -

Electronic Wiring diagram (Honeywell)

Showing the blower Wiring for the Optional

FbK-250 Kits

1. If any of the original wire as supplied must be replaced,

1. it must be replaced with Type AWm 105°C – 18 GA. wire.

2. 120V, 60Hz – Less than 3 amps.

An electrical outlet box (receptacle) is factory

-provided for the installation of the FbK-100,

FbK-200 and FbK-250 forced air blower kits.

(An optional ﬁeld-provided outletbox/J-Box

may also be used. Electrical power must be

connectedtoeitherofthesereceptaclesinorder

to operate these blowers. Install the blower

kits according to the installation instructions

provided with the kits.

Control

Valve

*Leave the ON/OFF switch, which is integral

with the gas valve, in the ON position.

*ON/OFF Switch (Integral

with Gas Valve)

Outlet box Green

Lower Control

Compartment

door

Ground Screw

Gas Valve

pILOT

ASSEmbLY

120

VAC.

Optional FbK-250

OpENING CONTROL

COmpARTmENT dOOR

module

OpT

bLOWER

White Wire

To Opposite

Side

Figure 19

Note: The tab connecting the receptacles of

theoutletboxmustbe brokeninFBK-100and

FBK-200 blower kit applications. See Figure

16 on page 13.

Junction box

Secure all joints tightly using appropriate

toolsandsealingcompounds(ensurepropane

resistant compounds are used in propane ap-

plications). Itisrecommendedtosealaround

the gas line to prevent cold air leakage.

Transf.

120 V.

Hot side of Outlet

24 V

Acquire the shut-off valve and gas lex line and

pull the assembly forward out of the compart-

ment. Separate the shut-off valve from the gas

ﬂex-line. Determine the length of pipe needed

to route the gas line from the last ﬁtting (shown

in Figure 20 on Page 15) to a point within the

control compartment that will allow the shut-

off valve to be easily attached by hand to the

gas ﬂex-line.

LImIT SWITCH

OpTIONAL ON/OFF SWITCH,

WALL SWITCH, THERmOSTAT

OR REmOTE CONTROL RECEIVER

Factory Wired

Field Wired

Schematic Representation Only

Figure 18

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After completing the installation of the optional

outside air vent system the outside air control

lever must be put in service and tested to en-

sure proper operation before completing any

enclosure around the ﬁrebox. Failure to do

so may result in extensive and costly rework.

Before the operation of the vent system can

be tested, the lever securing screw must be

removed. See Figure 21.

Gas Flex Line Connector

3/8" NPT x

Flare Fitting

Gas

1/2" x 3/8" Flare

Shut-off Valve

Valve

Note: The gas supply line

must be installed in accor-

dance with building codes

by a qualiﬁed installer

approved and/or licensed

as required by the locality.

In the Commonwealth of

Massachusetts, installa-

tion must be performed

by a licensed plumber or

gas ﬁtter.

3/8" Flex Tubing

Gas

1/2" x 3/8"

Stub

The hand operated outside air control lever is

located on the left side of the ﬁreplace opening.

See Figure 21.

Reducer

3/8" Nipple

3/8" Union

To open the outside air shutter, open the bot-

tom control access panel, reach into the control

compartment, and pull the outside air control

lever all the way out. The outside air shutter

should be fully open when the ﬁreplace is in use

and completely closed when the ﬁreplace is not

beingused. Closingitwhennotinusewillprevent

outside cold air from entering the dwelling.

3/8" Close

Nipple

3/8" Shut-off Valve

Gas Solid Line Connector

Figure 20 - GAS CONNECTION

Using pipe-dressing materials appropriate for

the gas type, securely afﬁx the shut-off valve

to this determined pipe length at a convenient

location outside of the appliance lower control

compartment.

Outside air drawn into the ﬁreplace supplies

air to the ﬁre for combustion. Only one outside

air duct is necessary, if installed. See Figure

3 on Page 5 and Figure 22 on Page 16 for the

location of the unit's outside air inlet.

Outside Air Control Lever

TEST ALL CONNECTIONS FOR GAS LEAKS

(FACTORY ANd FIELd):

If additional length of duct is necessary, pur-

chase locally available U.L. Class 0 or Class 1

metallic ducting. The duct may extend up to 50'

(15.24 m) in any direction.

WARNING

Note: When installing the air duct vertically, DO

NOT terminate the duct closer than 3' below

the chimney top.

Never use an open ﬂame to

check for leaks.

Outside Air Control Lever

Securing screw

Turn on gas supply and test for gas leaks us-

ing Turn on gas supply and test for gas leaks,

using a gas leak test solution (also referred to

as bubble leak solution).

Outside combustion air ducting may be run

upwards or vertically through framing and ceil-

ing joists, with the hood installed through an

outsidewalland3'(1m)belowthetermination.

Ducting may also be run downward through

ﬂoor joists and under the home to a ventilated

crawlspace not considered part of the living

area of the home.

Air Shutter in Closed position

Note: Using a soapy water solution is an effec-

tive leak test solution but it is not recommended,

because the soap residue that is left on the pipes/

ﬁttings can result in corrosion over time.

Outside Air Control Lever

A. Light the appliance (refer to the lighting

instructionslabelinthecontrolcompartment

or in the Care and Operation Instructions

manual).

Note: Do not terminate outside air kit in attic

space under any circumstances.

b. Brush all joints and connections with the gas

leak test solution to check for leaks. If bubbles

are formed, or gas odor is detected, turn the

gas control knob (off/pilot/on) to the “OFF”

position. Either tighten or refasten the leaking

connection, then retest as described above.

C. Whenthegaslinesaretestedandleakfree,be

sure to rinse off the leak testing solution.

CAUTION

Never locate inlet where it can be

blocked by shrubs, snow drifts,

etc. Never locate inlet in garage

or any area where there is another

fuel burning appliance or products

emitting combustible gases such

as paint, gasoline, etc. In cold

climates, it is recommended the

outside air duct be insulated.

Outside Air Control Lever

Securing Screw Removed

Air Shutter in Open position

Outside Air Control Lever

and Securing Screw Location

on Left Side of Cabinet in Lower Control

Compartment Area

Step 7. OUTSIdE AIR KITS

Optionaloutsidemake-upairkits,ModelFOAK-

4 or FAOK-4LD (see Figure 22 on Page 16),

may be used with these appliances. Refer to

the installation instructions packaged with the

air kits for speciﬁc installation information.

If used, the outside air kit must be installed

before the ﬁreplace is framed and enclosed in

the ﬁnished wall.

Figure 21

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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SIT millivolt Appliance Checkout

Step 9. INSTALLING LOGS, dECORA-

TIVE VOLCANIC STONE ANd GLOW-

ING EmbERS

The pilot ﬂame should be steady, not lifting

or ﬂoating. Flame should be blue in color with

traces of orange at the outer edge.

The top 3/8" (10 mm) at the pilot generator

(thermopile) and the top 1/8" minimum (tip)

of the quick drop out thermocouple should be

engulfed in the pilot ﬂame. The ﬂame should

project 1" (25 mm) beyond the hood at all three

ports (Figure 24).

WARNING

• dO NOT attempt to install the

logsuntiltheapplianceinstal-

lationhasbeencompleted,the

gas line connected and tested

forleaksandtheinitialburner

operation has been checked

out.

• Thesizeandpositionofthelog

setwasengineeredtogivethe

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

incompletecombustion,soot-

ing, and poor ﬂame quality.

• 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

installvolcanicstone,embers

and logs.

• Thisapplianceisnotdesigned

to burn wood. Any attempt

to do so could cause irrepa-

rabledamagetotheappliance

and prove hazardous to your

safety.

• If logs are not installed

according to the log instal-

lation instructions, flame

impingement and improper

combustion could occur and

resultinsootand/orexcessive

productionofcarbonmonoxide

(CO), a colorless, odorless,

toxic gas.

(ref. Form # 750,008M)

Outside Combustion Air Kits

Cat. No. Model No.

Description

Replace logs if removed for pilot inspection.

81L87

81L88

FOAK-4

Combustion Air Kit (w/duct)

To light the burner; turn “ON” the remote wall

switch and rotate the gas valve control knob

counterclockwise to the “ON” position.

FOAK-4Ld Combustion Air Kit (w/o duct)

Figure 22

SIT mILLIVOLT pILOT ASSEmbLY

proper pilot Flame Appearance

Igniter Rod

Hood

Step 8. VERIFYING AppLIANCE OpERA-

TION

With gas line installed run initial system check-

outbeforeclosingupthefrontoftheunit. Follow

the pilot lighting instructions provided in the

Care and Operation Instructions manual. For

piezo igniter location see Figure 23

Thermocouple

3/8"

(9 mm)

Note: Instructions are also found on the litera-

ture tag attached to the gas valve train.

pilot

Nozzels

When ﬁrst lighting the appliance, it will take

a few minutes for the line to purge itself of

air. Once purging is complete, the pilot and

burner will light and operate as indicated in

the instruction manual. Subsequent lightings

of the appliance will not require such purging.

Inspect the pilot ﬂame (remove logs, if neces-

sary, handling carefully).

Thermopile

Figure 24

Electronic Appliance Checkout

Tolighttheburner,turn‘ON’theoptionalremote

wall switch and turn the gas control switch to

the “ON” position. Ensure the igniter lights the

pilot. The pilot ﬂame should engulf the ﬂame

rod as shown in Figure 25.

SIT millivolt

Gas Valve

ELECTRONIC pILOT ASSEmbLY

Control

Compartment

proper pilot Flame Appearance

Shown with control

compartment door

removed

3/8" to 1/2"

(9 to 13 mm)

proper Flame

Adjustment

piezo Igniter

SIT millivolt Gas Valve

Showing piezo Igniter Location

pilot

Nozzels

Locatethepackagedcartonoflogs(whichwere

located in the ﬁrebox). The decorative volcanic

stone and glowing embers were packaged

separately in plastic bags located in the control

area of the ﬁreplace.

Ground

Figure 23

Electrode

Flame Rod

Install the logs per the instructions in the Care

and Operation Manual.

Hot Surface

Igniter

dO NOT attempt to install the logs until the ap-

plianceinstallationhasbeencompleted,thegas

lineconnectedandtestedforleaksandtheinitial

burner operation has been checked out.

Figure 25

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Proper twig placement is critical to prevent sooting. Twigs should be

placed in the gaps between the ﬂame peaks and should be positioned

so that at no time they impinge the ﬂames.

Glowing Embers

1. Remove the appliance front door.

Separate into Quarter

Size (separate) Pieces

2. Remove the log set from the interior of the ﬁreplace.

3. Removethelogsfromtheirpackaging. Handlelogscarefullytoprevent

breakage.

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

ﬁrebox rear panel and over the indents on the ﬁrebox ﬂoor.

Bag of Glowing

Embers (rockwool)

Glowing Embers, Vermiculite, decorative Volcanic Stone And Log

placement Instructions:

Figure 26

Step 1. Separate the Glowing Embers (Rockwool) into pieces about

the size of a quarter (see Figure 26). Keep the pieces ﬂuffed up, not

matted.

mpb-3328 & mpb-3530 models -

decorative Volcanic stone

(dark colored material)

Vermiculite

(light colored material)

Glowing Embers

DistributethesepiecesovertheburnerasshowninFigure27. Donotuse

more than is shown. The glowing embers should not be placed directly

over the large burner slots as shown in Figure 27.

mpb-4035 & mpb-4540 models -

Place the center log (Log No. 1) on the burner as shown on Page 20.

Distribute the glowing ember pieces at the front of the burner as shown

in Figure 28. Do not use more than is shown. The glowing embers

should not be placed directly over the large burner slots as shown in

Figure 28.

Note: This appliance is provided with enough Glowing Embers for

several applications; do not feel compelled to use all that is in a new

bag. For best glowing effect, replace the ember material annually. Re-

placement Glowing Embers are available (Catalog Number 88L53).

do Not place Glowing Embers Over Large burner ports

Step 2. Mound up a portion of the vermiculite (light colored material) in

frontoftheburnerandgrate.Sprinklethedarkcoloreddecorativevolcanic

stone on top of the vermiculite in a pleasing pattern. For best results,

spread in a non-uniform manner while ensuring complete coverage of

the black sheetmetal surface.

See Figure 27 - MPB-3328 or MPB-3530, or Figure 28 - MPB-4035 or

MPB-4540 models.

mpb-3328 and mpb-3530

Figure 27

Vermiculite

(light colored material)

Glowing Embers decorative Volcanic stone

(dark colored material)

Note: Do Not place vermiculite or decorative volcanic stone on top of

the gas burner where it will block the burner ports.

Step3. PositiontheindividuallogsasdescribedonPage18(MPB-3328),

Page 19 (MPB-3530) or Page 20 (MPB-4035 and MPB-4540).

Note: Your application may not require the use of all of the provided

vermiculite, or decorative volcanic stone. Replacement vermiculite,

volcanic stone and glowing embers is available (see below for ordering

information).

do Not place Glowing Embers Over Large burner ports

REFERENCE

Firebox Accessories / Parts

mpb-4035 and mpb-4540

Cat. No.

88L53

H6319

80L42

Model No.

Description

bag of Glowing Embers

Vermiculite, bag

Figure 28

FGE

FdVS

bag of decorative Volcanic Stone

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mpb-3328 LOG pLACEmENT

LOG SET

Catalog Number 24m1501

* Item

description (stamped #)

Log, Rear (39-12)

Log, Left (39-1)

Log, Right (39-2)

Log, Top Center (39-13)

Log, Top/Left (39-3)

Log, Top/Right (39-4)

* Item numbers above correspond to photos

Position the individual logs as shown below. Logs should be placed

in the order shown. Position the rear log on the brackets at the

rear of the ﬁrebox with the log's notches directly over the brackets.

Position the right log (log no. 3) by inserting the pin from the rear

log into the hole on its upper end. Place the left log and then the

smaller left and right top logs. All logs that have notches to ﬁt over

the grate tines should be positioned with these notches directly

against the grate. All top logs that rest on lower logs, do so over

ﬂattened mounting faces in the bottom logs.

Proper log and twig placement is critical to encourage outstanding

ﬂame appearance and prevent sooting.

Figure 29

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mpb-3530 LOG pLACEmENT

LOG SET

Catalog Number 24m2201

* Item

description (stamped #)

Log, Rear (39-5)

Log, Left (39-1)

Log, Right (39-2)

Log, Top Center (39-6)