Monessen Hearth DFX24C Manuel utilisateur

VENT-FREE FIREPLACE SYSTEMS

INSTALLATION AND OPERATING INSTRUCTIONS

READ AND SAVE THESE INSTRUCTIONS

MODELS

DFX24C

DBX24C*

DFX32C

Natural Gas or

Propane/LPG

Manual or Milli-Volt

*Thermostat Control Only

This is an unvented gas-red heater. It

uses air (oxygen) from the room in which

it is installed. Provisions for adequate

combustion and ventilation air must be

provided. See page 9.

WARNINGS

If the information in this manual is not followed

exactly, a re or explosion may result causing

property damage, personal injury or loss of

life.

– Do not store or use gasoline or other ammable

vapors and liquids in the vicinity of this or any other

appliance.

– 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.

• If you cannot reach your gas supplier, call the re

department.

– Installation and service must be performed by

a qualified installer, service agency or the gas

supplier.

2 33D4047

CONTENTS

Important Safety Information .....................................3

Product Features .......................................................5

Product Features and Specications .........................6

Getting Started ..........................................................7

General Installation Information ................................8

Location of Fireplace ..............................................16

Clearances and Height Requirements ....................17

Fireplace Framing ...................................................18

Connecting the Gas ................................................20

Checking Gas Pressure ..........................................21

Electrical Wiring (Milli-volt) ......................................22

Log Placement ........................................................24

Flame Appearance ................................................. 26

Installing Rock Wool and Checking Burner Flame ..27

Operating Instructions ............................................29

For Your Safety Read Before Lighting ...............29

Manual Control Lighting Instructions ................30

Thermostat Control Lighting Instructions ..........31

Milli-Volt Control Lighting Instructions .............. 32

Match Lighting Instructions ...............................33

Cleaning and Servicing ...........................................34

Blower and Optional Equipment ..............................34

Illustrated Parts

Cabinet Accessories ..........................................35

DFX24C Milli-Volt, DFX24C Manual..................36

DFX32C Milli-volt, DFX32C Manual ..................38

DBX24C T-stat ..................................................40

Troubleshooting ......................................................42

Warranty .................................................. Back Cover

DFX24C and DFX32C gas log appliances described in this manual feature the

TRIPLE PLAY BURNER SYSTEM® technology

with exclusive triple effect technology

producing a full random yellow ame, full depth ember bed and glowing logs.

33D4047 3

9. This unit complies with ANSI Z21.11.2 unvented heaters

standard.

10. Do not install the DFX Model in a bathroom or bedroom.

The DBX Model may be installed in a bedroom, but not

in a bathroom.

11. Correctinstallationoftheceramicberlogs,properloca-

tionoftheheater,andannualcleaningarenecessaryto

avoidpotentialproblemswithsooting.Sooting,resulting

from improper installation or operation, can settle on sur-

facesoutsidethereplace.Seelogplacementinstructions

for proper installation.

12. Avoidanydraftsthatalterburneramepatterns.Donot

allowfanstoblowdirectlyintoreplace.Donotplace

ablowerinsideburnareaofrebox.Ceilingfansmay

createdraftsthatalterburneramepatterns.Sootingand

improperburningwilloccur.

13. CAUTION: Candles, incense, oil lamps, etc. produce

combustionby-productsincludingsoot.Vent-freeappli-

anceswillnotlterorcleansootproducedbythesetypes

of products. In addition, the smoke and/or aromatics

(scents) may be reburnt in the vent-free appliance which

can produce odors. It is recommended to minimize the

use of candles, incense, etc. while the vent-free appliance

is in operation.

14. Anunventedgas-redheaterusesair(oxygen)fromthe

room in which it is installed. Provisions for adequate

combustion and ventilation air must be provided. See

installationguidelines.

IMPORTANT

Read these instructions carefully before installing or trying to operate a vent-free gas heater in this rebox.

IMPORTANT SAFETY INFORMATION

1. Due to high temperatures, the appliance be

locatedoutoftrafcandawayfromfurnitureand

draperies.

2. Children and adults should be alerted to the hazard

ofhighsurfacetemperatureandshouldstayaway

toavoidburnsorclothingignition.

3. Youngchildrenshouldbecarefullysupervisedwhen

they are in the same room with the appliance.

4. Donotplaceclothingorotherammablematerial

on or near the appliance.

5. Anysafetyscreenorguardremovedforservicing

anappliance, mustbe replacedprior tooperating

the heater.

6. Installationandrepairshouldbedonebyaqualied

service person.

7. Topreventmalfunctionand/orsooting,anunvented

gas heater should be cleaned before use at least

annually by a professional service person. More

frequentcleaningmayberequiredduetoexcessive

lint from carpeting, bedding material, etc. It is

imperative that control compartments, burners and

circulatingairpassagewaysbekeptclean.

8. CARBON MONOXIDE POISONING: Earlysignsof

carbonmonoxidepoisoning aresimilarto theuwith

headaches, dizziness and/or nausea. If you have these

signs,obtainfreshairimmediately.Havetheheaterser-

vicedasitmaynotbeoperatingproperly. Continued on page 4

WARNING

• Any change to this heater or its controls can be dangerous.

• Improper installation or use of the heater can cause serious injury or death from

re, burns, explosion or carbon monoxide poisoning.

• Do not allow fans to blow directly into the replace. Avoid any drafts that alter burner

ame patterns.

• Do not use a blower insert, heat exchanger insert or other accessory, not approved

for use with this heater where applicable.

INSTALLER

Please leave these instructions with the appliance.

OWNER

Please retain these instructions for future reference

4 33D4047

IMPORTANT SAFETY INFORMATION

This appliance may be installed in an aftermarket,

permanently located, manufactured (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.

15. Keep room area clear and free from combustible materi-

als,gasolineandotherammablevaporsandliquids.

16. Unvented gas heaters are a supplemental zone heater.

They are not intended to be a primary heating appli-

ance.

17. Unventedgasheatersemitmoistureintothelivingarea.

Inmosthomesofaverageconstruction,thisdoesnotpose

a problem. In houses of extremely tight construction,

additional mechanical ventilation is recommended.

18. Duringmanufacturing,fabricatingandshipping,various

components of this appliance are treated with certain oils,

lmsorbondingagents.Thesechemicalsarenotharmful

butmayproduceannoyingsmokeandsmellsastheyare

burnedoffduringtheinitialoperationoftheappliance;

possiblycausingheadaches,oreyeorlungirritation.This

is a normal and temporary occurrence.

The initial break-in operation should last two to three

hours with the burner at the highest setting. Provide

maximumventilationbyopeningwindowsordoorsto

allowodorstodissipate.Anyodorsremainingafterthis

initialbreak-inperiodwillbeslightandwilldisappear

with continued use.

19. Input ratings are shown in BTU per hour and are for

elevations up to 2,000 feet. For elevations above 2,000

feet,inputratingsshouldbereduced4percentforeach

1,000 feet above sea level. Refer to the National Fuel Gas

Code.

20. Theapplianceanditsappliancemaingasvalvemustbe

disconnectedfromthegassupplypipingsystemduring

anypressure testingofthat systemat testpressuresin

excessof1/2psig(3.5kPa).

21. Theappliancemustbeisolatedfromthegassupplypiping

systembyclosingitsequipmentshutoff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).

22. Do not use this room heater if any part has been under

water.Immediatelycallaqualiedservicetechnicianto

inspect the room heater and to replace any part of the

controlsystemandanygascontrolwhichhasbeenunder

water.

23. Neverburnsolidfuelsinareplacewhereaunvented

room heater is installed.

24. Alwayshaveareplacescreeninplacewhentheappli-

ance is in operation, and unless other provisions for

combustion air are provided, the screen shall have an

opening(s)forinductionofcombustionair.

25. Donotllspacesaroundthereboxwithinsulationor

other materials. These spaces must be maintained to pre-

ventthereboxfromcomingincontactwithcombustible

materials.

33D4047 5

Piezo

Ignition

Fireplace Screen

Control

Knob

PRODUCT FEATURES

Yourvent-freereplacemustbemountedontheoororontheoptionalreplacehearth.

OPERATION

Thisunventedgasheaterrequiresnooutsideventingandburnscleanlywithhighheatingefciency.

Thiszero-clearanceunventedgasheatercanbeinstalledagainst(orrecessedinto)anywallthatisaccessibletoagasline.

Figure 1 - Unvented Gas Heater

(Control Access Door Shown Open)

On/Off

Switch

6 33D4047

NATURAL GAS

Manual and T-Stat Pressure

Regulator Pressure Setting 4 in. w.c.

Gas Inlet Pressure: Max. 10.5 in. w.c.

Min. 5 in. w.c.

PRODUCT FEATURES and SPECIFICATIONS

IGNITION CONTROLS

Piezoignitorallowsignitionofthepilotwithouttheuseofmatchesorbatteries.

Manual control has four (4) positions:

OFF - Allgastothegaslogsisshutoffatthevalve.

IGN - Valvepositiontolight/maintainastandingpilot.

ON - ValvepositiontoturnON/OFFlogsetwithremoteswitch/thermostat.

LOW/HI - Variablepositiontocontrolameheight(heatoutput).Bothfrontandrearburnersareinoperationto

providerealisticglowandyellowame.

Thermostat control has three (3) positions:

OFF - Allgastothegaslogsisshutoffatthevalve.

IGN - Valvepositiontolight/maintainastandingpilot.

LOW/HI - Variablepositioncorrespondingtodesiredtemperature.

Continued

Model Number Type Gas Rate Number of

Burners

Max BTU/Hr Min BTU/Hr

DFX24PMC Manual 22,000 17,000 1

DFX24PVC Milli-Volt 22,000 17,000 1

DFX32PMC Manual 26,000 15,000 1

DFX32PVC Milli-Volt 26,000 20,000 1

DBX24PTC T-Stat 10,000 — 1

Milli-Volt Pressure

Regulator Pressure Setting 3.5 in. w.c.

Pilot Regulator 3.5 in. w.c.

Gas Inlet Pressure: Max. 10.5 in. w.c.

Min. 5 in. w.c.

PROPANE / LPG

Note: An external regulator is required to reduce supply pressure to a maximum of 13" w. c.

T-Stat, Manual and Milli-Volt Pressure

Regulator Pressure Setting 10 in. w.c.

Gas Inlet Pressure: Maximum 13 in." w.c.

Minimum 11 in. w.c.

Model Number Type Gas Rate Number of

Burners

Max BTU/Hr Min BTU/Hr

DFX24NMC Manual 22,000 15,000 1

DFX24NVC Milli-Volt 22,000 17,000 1

DFX32NMC Manual 26,000 15,000 1

DFX32NVC Milli-Volt 26,000 20,000 1

DBX24NTC T-Stat 10,000 — 1

33D4047 7

PILOT

Thegaslogheateristtedwithaspeciallydesignedsafetypilotlightwhichsensestheamountofoxygenavailableinthe

roomandshutsthegaslogheateroffiftheoxygenlevelbeginstodropbelowasatisfactorylevel.Thepilotcanonlyberelit

when adequate fresh air is available.

THERMAL GENERATOR

The milli-volt gas log pilot is tted with a milli-volt generator to provide power for remote activation.

GETTING STARTED

Make sure you have received all parts:

Checkyourpackinglisttoverifythatalllistedpartshavebeenreceived.Youshouldhavethefollowing:

 • Unventedgasheater •Two(2)90°-anglebrackets • Trimkit

 • Installation/operatinginstructions •Canopyandthree(3)screws • Two(2)anchoringscrews

 • Ceramicberlogs •Four(4)blackscrews

MillivoltcontrolledheaterdesignedtobeoperatedwithoptionaldevicesforON/OFFfunctions.

 • HandheldRemotewithreceiver • WallT-statwith20'wire

 • Wallswitchwith20'wire • HandheldThermostatRemotew/receiver

PRODUCT SPECIFICATIONS and GETTING STARTED

Carefullyinspectthecontentsforshippingdamage.Ifanypartsaremissingordamaged,immediatelyinformthedealer

from whom you purchased the appliance. Do not attempt to install any part of the appliance unless you have all parts

in good condition.

Whatyouwillneedforinstallation:

Youmusthavethefollowingitemsavailablebeforeproceedingwithinstallation:

 • Externalregulator(forpropane/LPGonly) • Manualshutoffvalve

 • Pipingwhichcomplieswithlocalcodes • Sedimenttrap

• Phillips head screwdriver • Tee joint.

 • Pipesealantapprovedforusewithpropane/LPG • Pipewrench

(Resistant to sulfur compounds)

CAUTION

• Handle the gas log burner assembly by the grate only. Do not pick the unit up by

the burners.

• Gloves are recommended when handling ceramic ber logs to prevent skin irritation

from loose bers. Logs are fragile — handle with care.

Milli-Volt control has four (4) positions:

OFF - Allgastothegaslogsisshutoffatthevalve.

IGN - Valvepositiontolight/maintainastandingpilot.

ON - ValvepositiontoturnON/OFFlogsetwithremoteswitch/thermostat.

LOW/HI - Variablepositiontocontrolameheight(heatoutput).Bothfrontandrearburnersareinoperationto

providerealisticglowandyellowame.

8 33D4047

Inplanningtheinstallationforthereplaceitisnecessarytodeterminewheretheunitistobeinstalledandwhetheroptional

accessoriesaredesired.Gassupplypipingshouldalsobeplanned.Thefollowingstepsrepresentthenormalsequenceof

installation.Eachinstallationisunique,however,andmightrequireadifferentsequence.

 1.Positionreplacein desiredlocation.SeetheLocation of Fireplace and Clearances and Height Requirements, and

Firebox Framing sections found in this manual.

Note: Be sure all packing material has been removed from underside the unit.

2.Installcanopyandlogsperinstructionsfoundinthismanual.ThecanopyMUSTbeinstalledforsafeoperationofthe

unit.

3. Field wire main power supply to units with fan kit. See the Electrical Section found in this manual. (Electrical connec-

tionsshouldonlybeperformedbyanexperienced,licensedcertiedtradesman).

 4.InstalloptionalON/OFFkitonunitswithmillivoltcontrol.Seeinstallationinstruc-

tions included with the kit and also See the Electrical Wiring section found in this

manual.

 5.Plumbgasline.SeetheConnecting the Gas section found in this

manual.(Gasconnectionsshouldonlybeperformedbyanexperienced,

licensed/certiedtradesman).

 6.Completenishwallmaterialand/orsurround.

Figure 2 - Firebox Dimensions with Screen and Log Sets Removed

GENERAL INSTALLATION INFORMATION

DFX24C/DBX24C DFX32C

A14 213/4

B131/8171/2

C117/8133/8

D9 105/8

E21 27

F47/85

G17 201/4

H1 15/8

I221/2283/4

J1 15/8

K241/232

L45/843/4

M101/212

N261/230

33D4047 9

GENERAL INSTALLATION INFORMATION

ADEQUATE COMBUSTION AND VENTILATION AIR

Thisheater shallnotbeinstalledin aconned spaceor unusuallytight constructionunlessprovisions areprovided for

adequate combustion and ventilation air.

TheNationalFuelGasCodedenesaconnedspaceasaspacewhosevolumeislessthan50cubicfeetper1,000BTUper

hour(4.8m3perkw)oftheaggregateinputratingofallappliancesinstalledinthatspace.Anunconnedspaceisdened

asaspacewhosevolumeisnotlessthan50cubicfeetper1,000BTUperhour(4.8m3perkw)oftheaggregateinputrating

ofallappliancesinstalledinthatspace.Roomscommunicatingdirectlywiththespaceinwhichtheappliancesareinstalled,

throughopeningsnotfurnishedwithdoors,areconsideredapartoftheunconnedspace.

UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…

a) wallsandceilingsexposedtotheoutsideatmospherehaveacontinuouswatervaporretarderwitharatingof1perm(6

x1011kgper-pa-sec-m2)orlesswithopeningsgasketedorsealed,and

b) weatherstripinghasbeenaddedonopenablewindowsanddoors,and

c) caulkingorsealantareappliedtoareassuchasjointsaroundwindowsanddoorframes;betweensoleplatesanddoors;

betweenwall-ceilingjoints;betweenwallpanels;atpenetrationsforplumbing,electrical,andgaslines;andatother

openings.

CODES

Adheretoalllocalcodesor,intheirabsence,thelatesteditionofTHENATIONALFUELGASCODEANSIZ223.1or

NFPA54 which can be obtained from…

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

WARNING

Do not install the heater

• where curtains, furniture, clothing, or other

ammable objects are less than 42" from the front

of the heater.

• in high trafc areas.

• in windy or drafty areas.

10 33D4047

GENERAL INSTALLATION INFORMATION

Figure 3 - Sample Room for Determining the Maximum Heater Rating

WARNING

If the area in which the heater may be operated is smaller than that dened as an

unconned space or if the building is of unusually tight construction, provide adequate

combustion and ventilation air by one of the methods described in the National Fuel

Gas Code, ANSI Z223.1, 1992, Section 5.3 or applicable local codes.

Thefollowingformulacanbeusedtodeterminethemaximumheaterratingperthedenitionofunconnedspace:

BTU/Hr =

(L1 + L2) Ft x (W) Ft x (H) Ft. x1000 BTU/Hr

Considertwoconnectingroomswithanopenareabetween,withthefollowingdimensions:

L1= 151/2Ft.,L2=12Ft.,W=12Ft.,H=8Ft.

BTU/Hr = (151/2 + 12) x (12) x (8) x1000=52800 BTU/Hr

If there were a door between the two rooms the calculation would be based only on the room with the heater.

BTU/Hr = (151/2) x (12) x (8) x1000=29760 BTU/Hr

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