background image

7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS  •  MERIT

® 

 SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES  •  MODEL MLDVTCD-35  •  CARE AND OPERATION

GENERAL INFORMATION

The fireplace models covered in this manual 

are  direct-vent  sealed  combustion  gas  fire-

places  designed  for  residential  application.  

These direct-vent appliances operate with the 

combustion chamber completely isolated from 

the indoor environment.  

All air for combustion is brought in from the 

outside and  exhaust gases are vented through 

the same direct-vent, co-axial (intake/exhaust) 

vent system.

The  Millivolt  appliances  have  a  millivolt  gas 

control valve with piezo ignition system. If any 

optional  accessories  which  require  electrical 

power are being installed, the electrical power 

must  be  provided  at  the  time  of  appliance 

installation.

The  Electronic  appliances  have  a  battery 

backed-up  electronic  intermittent  pilot  sys-

tem.  The    battery  back-up  will  allow  you  to 

continue operation of the appliance during a 

power outage.

These appliances comply with National Safety 

Standards  and  are  tested  and  listed  by  ETL/

Intertek  (Report  No.  100353019PRT-002)  to 

ANSI  ZZ21.50  (in  Canada,  CSA-2.22),  and 

CAN/CGA-2.17-M91 in both USA and Canada, 

as vented gas fireplaces.

The Installation must conform to local codes 

or,  in  the  absence  of  local  codes,  with  the 

National  Fuel  Gas  Code,  ANSI  Z223.1/NFPA 

54-latest edition, or the Natural Gas and Pro-

pane Installation Code, CAN/CSA B149.1-latest 

edition.  The appliance, when installed, must be 

electrically grounded in accordance with local 

codes or, in the absence of local codes, the 

latest edition of the National Electrical Code, 

ANSI/NFPA 70, or the Canadian Electrical Code, 

CSA C22.1 - latest editions.

Inlet Gas Supply Pressure (all models)

Fuel #

Minimum

Maximum

Natural Gas

4.5" WC

(1.12 kPa)

10.5" WC

(2.61 kPa)

Propane

11.0" WC

(2.74 kPa)

13.0" WC

(3.23 kPa)

Table 2

Manifold Gas Supply Pressure (all models)

Fuel #

Low

High

Natural 

Gas

(Lo) 2.2" WC

(0.55 kPa)

(Hi) 3.5" WC

(0.87 kPa)

Propane (Lo) 6.3" WC

(1.57 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 3

Gas Pressure Requirements 

(All Models)

Gas  pressure  requirements  are  listed  in 

Tables 2 and 3. 

Test gauge connections are provided on the 

front of the millivolt gas control valve, identi-

fied IN for the inlet and OUT for the manifold 

side (see Figure 3 on Page 9

)

.  A 1/8" NPT 

Test gauge connection is provided at the inlet 

and outlet (manifold) ports on the electronic 

gas control valve (see Figure 4 on Page 9

)

.

 Input (BTU/HR) Manually Modulated 

Gas Valves (all models)

Model

Input Rate (BTU / HR)

Nat. Gas

Prop. Gas

MLDVTCD-35

  

14,500 high

11,500 low

13,500 high

10,500 low

Table 1

BTU Input

Millivolt and electronic models come standard 

with  a  manually-modulated  gas  valve;  flame 

appearance and heat output can be controlled 

at the gas valve. The BTU inputs for these ap-

pliances are shown in Table 1.

Orifice Sizes 

(Sea Level to High Altitude – All Models)

These appliances are tested and approved for 

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

meters) above sea level using the standard burner 

orifice sizes (marked with an "*" in Table 4

)

.  For 

elevations above 4500 feet, contact your gas 

supplier or qualified service technician. 

Deration

At higher elevations, the amount of BTU fuel 

value delivered must be reduced by either:

•   Using gas that has been derated by the gas 

company. 

•   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.

Install the appliance 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 CAN/CSA-B149.1 - latest edition.

NOTE: 

Flame appearance will diminish 4% per 

thousand feet.

Burner Orifice Sizes 

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

Nat.Gas

drill size (inches)

Propane

drill size (inches)

 

MLDVTCD-35

#49 (0.073") *

21L82 •

0.045" **

75L10

 •

Table 4

* Standard size installed at factory.

** Standard size in LP conversion kit.

•  Part /Cat. Number.

Burn-in Period

During  the  first  few  fires  in  this  appliance, 

there will be some odor due to the curing of 

the 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.  

KEEP  YOUR  HOUSE  WELL  VENTILATED 

DURING THE BURN-IN PROCESS. THE ODOR 

AND HAZE EMITTED DURING THE BURN-IN 

PROCESS CAN BE QUITE NOTICEABLE AND 

MAY SET OFF A SMOKE DETECTOR.

If an optional blower is installed, do NOT turn 

it on during the burn-in period. 

IMPORTANT NOTE!

A white film may develop on the glass 

enclosure panel during the first few 

fires as part of the burn-in process. 

The  first  few  times  you  use  the 

fireplace,  clean  the  glass  after 

each  use  (

AFTER  THE  GLASS  HAS 

COMPLETELY COOLED

); otherwise, 

the  white  film  will  bake  onto  the 

glass  and  become  difficult  to 

remove.  

See “Cleaning Glass” on Page 10.

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 dur-

ing any pressure testing of that system 

at pressures 

greater than

 1/2 psig (3.5 

kPa).

Summary of Contents for MLDVTCD-35NE

Page 1: ... instructions is not followed exactly a fire or explosion may result causing property damage personal injury or death WARNING AVERTISSEMENT AVISO HOT GLASS WILL CAUSE BURNS DO NOT TOUCH GLASS UNTIL COOLED NEVER ALLOW CHILDREN TO TOUCH GLASS UNE SURFACE VITRÉE CHAUDE PEUT CAUSER DES BRÛLURES LAISSER REFROIDIR LA SURFACE VITRÉE AVANT D Y TOUCHER NE PERMETTEZ JAMAIS À UN ENFANT DE TOUCHER LA SURFACE ...

Page 2: ...ty and Your Fireplace 2 Important Safety Information 4 Attaching the Safety in Operation Warnings 5 Appliance Installation Service and Maintenance Notices 6 Appliance Operation Notices 6 Warranty Information 6 General Information 7 Operation Care of Your Appliance 8 Variable Flame Adjustment 9 Maintenance 10 Front Glass Enclosure Panel Removal and Installation 11 Install Contemporary Media 12 Burn...

Page 3: ...levées voir page 5 Lisez la section Informations importantes relatives à la sécurité page 4 Toutes les parties de votre foyer Lennox Hearth Products deviennent EXTRÊMEMENT CHAUDES Instale una malla o barrera física para evitar el contacto directo con el vidrio y prevenir las quemaduras y lesiones graves Ver los detalles a la izquierda para ordenar un Lennox SAFETY GUARD GRATIS para su chimenea Sig...

Page 4: ...its les jeunes enfants ou les adultes peuvent subir des brûlures s ils viennent en contact avec la surface chaude Il est recommandé d installer une barrière physique si des personnes à risques habitent la maison Pour empêcher l accès à un foyer ou à un poêle installez une barrière de sécurité cette mesure empêchera les tout petits les jeunes enfants et toute autre personne à risque d avoir accès à...

Page 5: ...de la siguiente manera 1 Identifique el interruptor o el termostato de pared quecontrolalachimenea verifiquequeelinterruptor opera la chimenea encendiéndola y apagándola Limpiebienlaplacadelinterruptoroeltermostatode paredparaquitarelpolvoyaceite Peguelaetiqueta enlasuperficiedelaplacadelinterruptorquecontrola la chimenea Figura A o en el termostato de pared Figura B Seleccione el idioma que más s...

Page 6: ...py of the warranty accompanying this manual Please read the warranty to be familiar with its coverage Retain this manual File it with your other docu ments for future reference Failure to comply with the installation and operating instructions provided will result in an improperly installed and operating appliance voiding its warranty Do not attempt to alter or modify the construction of the appli...

Page 7: ...00 high 10 500 low Table 1 BTU Input Millivolt and electronic models come standard with a manually modulated gas valve flame appearance and heat output can be controlled at the gas valve The BTU inputs for these ap pliances are shown in Table 1 Orifice Sizes Sea Level to High Altitude All Models These appliances are tested and approved for installation at elevations of 0 4500 feet 0 1372 meters ab...

Page 8: ... with the electronic valve shown in Figure 4 Millivolt Appliances To light millivolt ap pliances refer to Figure 1 Detailed lighting instructions are found on Pages 20 and 21 Millivolt appliance lighting instructions may also be found on the pull out lighting instruc tion labels attached to the gas control valve Once the pilot is lit the main burner may be turnedONandOFFusingawallswitch remote con...

Page 9: ...our appliance in a power outage do the following Install batteries in battery pack Turn unit mounted switch or wall switch to the ON Position Unit should spark at pilot and light Operate Normally Replace batteries if needed After power is restored remove batteries Figure 3 SIT Millivolt Gas Valve Variable Flame Height Adjustment Manifold Pressure Port Inlet Pressure Port Main Gas Control Knob H I ...

Page 10: ...ssages are unobstructed and vent components are properly assembled and not damaged Homeowner must contact a qualified service technician at once if any abnormal condition is observed If the venting system is disassembled for any reason a qualified service technician should follow vent installation instructions for proper reassembly and proper sealing of the venting system components However more f...

Page 11: ... door frame swing gentlyintowardsthefireplaceensuringthat the gasket seats evenly as the door frame draws shut Fasten the two latches located underneath the firebox floor to the door s vee flange Closeboththelatchessecurely 8 If desired install the optional hood Note the location of the three clips inside the top air channel above the door The clips are equally spaced on the top surface of the air...

Page 12: ...IMPORTANT Be sure stones do not im pinge on the burner outlet Install Crushed Glass And Sand MCCG and MBSK IMPORTANT Refractorypanelsshouldbe installed before any of the contemporary media are installed 1 Pour out glass or sand on firebox sub floor completely covering the sub floor See Figure 6 Detail D on Page 13 for an example IMPORTANT Avoid letting glass or sand fall into the burner outlet Mak...

Page 13: ...nd Contemporary Media Placement Detail A Rear Zen Garden Panel Burner Outlet Detail B Burner Outlet Left Zen Garden Panel Right Zen Garden Panel Black Obsidian Contemporary Glass Detail C Detail D Diamond White Contemporary Glass Burner Outlet Tumbled River Stone Burner Outlet Contemporary Beach Sand Note River Stone And Beach Sand May Be Used Together Note Beach Sand And River Stone May Be Used T...

Page 14: ...closed too far sooting may develop Sooting is indicated by black puffs developing at the tips of very long orange flames Sooting results in black deposits forming on the appliance inside sur faces and on exterior surfaces adjacent to the vent termination Sooting is caused by incomplete combustion in the flames and lack of combustion air enter ing the air shutter opening To achieve a warm yellowish...

Page 15: ...RONIC Pilot Hood Sensor Igniter WARNINGS Air shutter adjustment should only be performed by a quali fiedprofessionalservicetech nician Ensure front glass panel are in place and sealed during adjustment CAUTIONS Soot will be produced if the airshutterisclosedtoomuch Any damage due to carboning resulting from improperly setting the air shutter is not covered under the warranty Theairshutterdoorandne...

Page 16: ...uestions or address your concerns LENNOX hEARTH pRODUCTS 1508 Elm Hill Pike Suite 108 Nashville TN 37210 Visit us at www Lennox com 1 800 9 LENNOX If you encounter any problems or have any questions concerning the installation or ap plication of this system please contact your dealer or distributor PRODUCT REFERENCE INFORMATION We recommend that you record the important reference information about...

Page 17: ... signal has been sent The Model RCL is designed to operate with all mil livolt ignition systems as well as electronic ignition systems It may be installed with use for either natural gas or propane gas appliances The RCL offers ease of installation and allows you to execute on off commands to the fireplace effortlessly with one simple motion TheModelRCLcomescompletewithdetailedoperat ing instructi...

Page 18: ...ch Pane Door Charcoal 35 Arch Pane Door Satin Pewter MLDVTCD 35 H6106 APDML35C H6107 APDML35SP SQUARE PANE DESIGN KITS Cat No Model Description Model Series 35 Square Pane Door Charcoal 35 Square Pane Door Satin Pewter MLDVTCD 35 H6098 SPDML35C H6099 SPDML35SP Contemporary Facade Kits Cat No Model No Description H7732 CDFBBK 35 Facade Base Black H7733 CDFBSS 35 Facade Base Stainless H7730 CDFFBK 3...

Page 19: ...e applianceblackpaintedsurfacesmaybeaccomplished with the touch up paint kit Touch Up Paint Kits all models Cat No ModelNo Description 90L73 TPK B Touch Up Paint Black PA I N T Termination Guard Kits all models Cat No ModelNo Description H5820 4 5HTSK Termination Shroud 87L02 SV4 5HGS Termination Guard Deluxe 17M52 SV4 5HGS 1 Termination Guard Square Termination Guard Kits Theventterminationguards...

Page 20: ...ilot should remain lit If it goes out repeat steps 5 through 8 If knob does not pop up when released stop and immediately call your service technician or gas supplier If pilot will not stay lit after several tries turn the control knob to OFF and call your service technician or gas supplier 9 Turn gas control knob counterclockwise to ON 10 Close lower control compartment 11 If the appliance will n...

Page 21: ...ement la veilleuse en déclenchant l allume gaz à étincelle en poussant le bouton jusqu à ce que la veilleuse s enflamme Continuez de tenir le bouton de réglage enfoncé pen dant environ 90 secondes après l allumage de la veilleuse Relâ chez le bouton et il sortira subitement La veilleuse devrait rester allumée Si elle s éteint répétez les étapes 5 à 8 inclusivement Si le bouton ne sort pas automati...

Page 22: ... OFF GAS TO APPLIANCE OPERATING INSTRUCTIONS 1 STOP Read the safety information above on this page 2 Turn remote wall switch to OFF or set wall thermostat to lowest setting If used remove the batteries from the battery holder 3 This appliance is equipped with an ignition device which automatically lights the pilot Do not try to light the pilot by hand 4 Push the unit mounted ON OFF switch to the O...

Page 23: ...il leuse manuellement 4 Tournez la manette de réglage du gaz à la position d arrêt OFF 6 Poussez le commutateur de l unité à la position marche ON Le commutateur de l unité peut aussi être complémenté d un interrupteur mural si le brûleur ne s allume pas ou ne reste pas allumeé après plusieurs essais tournez le commutateur de l unité à la position arrêt OFF et appelez votre fournisseur de gaz ou v...

Page 24: ...ion of caps pipe and fittings excessive condensation can be caused by long lateral runs too many elbows and or exterior portions of the system being exposed to cold weather Also inspect wall straps or plumbers s tape to ensure it is secure and in place Appliance Checkout Qualified Service Technician Perform the appropriate appliance checkout procedure detailed in this manual Periodically After the...

Page 25: ...F ON switch is ON Read impor tant note below IMPORTANT NOTE If an optional remote switch is used for burner operation the unit mounted burner OFF ON switch if installed must be in the OFF position Optional remote switch kits wall switch wall thermostat or remote control A Wall switch or wires defective Check wall switch and wires for proper connections Jumper wire across terminals at wall switch i...

Page 26: ...s of module and or batteries It should be around 2 7 to 3 2 VAC Turned gas supply to ON Check wire connection Check location of sensor Check vent system for obstructions Check for proper air shutter openings A Low voltage or bad lead wires B Damaged igniter wire C Damaged pilot assembly D Batteries Low A No fuel supply B Loose sensor wire C Lose wires to valve D Loose wires to ignition module E Ai...

Page 27: ...Description Natural Gas Propane Gas Part No Qty Part No Qty 15 Gas Valve SIT H6209 1 88J53 1 16 Piezo Igniter 10K86 1 10K86 1 17 Pilot Assembly 69L17 1 69L18 1 18 Pilot Generator 60J79 1 60J79 1 19 Thermocouple 74L57 1 74L57 1 20 Pilot Tube 74L56 1 74L56 1 21 Electrode and Cable H6212 1 H6212 1 Gas Controls Dexen Electronic Item No Description Natural Gas Part No Qty 28 Gas Valve Dexen H4681 1 29 ...

Page 28: ...NOX HEARTH PRODUCTS MERIT SERIES DIRECT VENT CONTEMPORARY DESIGN GAS FIREPLACES MODEL MLDVTCD 35 CARE AND OPERATION Replacement Parts Dexen Valve Assembly SIT Valve Assembly Ref 12A 5 16 29 9 28 8 6 17 18 19 15 6 9 11 12B 31 7 4 10 12C 2 1 30 32 33 3 12 ...

Page 29: ...29 NOTE DIAGRAMS ILLUSTRATIONS ARE NOT TO SCALE LENNOX HEARTH PRODUCTS MERIT SERIES DIRECT VENT CONTEMPORARY DESIGN GAS FIREPLACES MODEL MLDVTCD 35 CARE AND OPERATION NOTES ...

Page 30: ...ny time without notice in design materials specifications prices and also to discontinue colors styles and products Consult your local distributor for fireplace code information 1508 Elm Hill Pike Suite 108 Nashville TN 37210 LENNOX HEARTH PRODUCTS MERIT SERIES DIRECT VENT CONTEMPORARY DESIGN GAS FIREPLACES MODEL MLDVTCD 35 CARE AND OPERATION ...

Reviews: