Monessen Hearth DBX24C' User Manual

VENT-FREE FIREPLACE SYSTEMS

INSTALLATION AND OPERATING INSTRUCTIONS

MODELS

DFX24C

DBX24C*

DFX32C

Natural Gas or

Propane/LPG

Manual or Milli-Volt

*Thermostat Control Only

This is an unvented gas-ﬁ 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 ﬁ re or explosion may result causing property damage, personal injury or loss of life.

– Do not store or use gasoline or other ﬂ 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 ﬁ re department.

– Installation and service must be performed by

a qualified installer, service agency or the gas supplier.

READ AND SAVE THESE INSTRUCTIONS

CONTENTS

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

TRIPLE PLAY BURNER SYSTEM

with exclusive triple effect technology

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

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

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

Product Features and Speciﬁ 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

technology

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

Installing Rock Wool and Checking Burner Flame ..27

2 33D4047

IMPORTANT SAFETY INFORMATION

INSTALLER

Please leave these instructions with the appliance.

OWNER

Please retain these instructions for future reference

IMPORTANT

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

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

• Do not allow fans to blow directly into the ﬁ replace. A void any drafts that alter burner ﬂ ame patterns.

WARNING

• Do not use a blower insert, heat exchanger insert or other accessory, not approved for use with this heater where applicable.

1. Due to high temperatures, the appliance be located out of traffic 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 flammable material on or near the appliance.

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 fiber logs, proper location of the heater, and annual cleaning are necessary to avoid potential problems with sooting. Sooting, resulting from improper installation or operation, can settle on surfaces outside the fireplace. See log placement instructions for proper installation.

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 qualified 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 flu with headaches, dizziness and/or nausea. If you have these signs, obtain fresh air immediately. Have the heater serviced as it may not be operating properly.

33D4047 3

12. Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into fireplace. Do not place a blower inside burn area of firebox. Ceiling fans may create drafts that alter burner flame patterns. Sooting and improper burning will occur.

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

combustion by-products including soot. Vent-free appliances will not filter 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-fired 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.

Continued on page 4

IMPORTANT SAFETY INFORMATION

15. Keep room area clear and free from combustible materials, gasoline and other flammable vapors and liquids.

16. Unvented gas heaters are a supplemental zone heater. They are not intended to be a primary heating appliance.

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, films 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.

25. Do not fill spaces around the firebox with insulation or other materials. These spaces must be maintained to prevent the firebox from coming in contact with combustible materials.

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.

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 qualified 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 fireplace where a unvented room heater is installed.

24. Always have a fireplace screen in place when the appliance is in operation, and unless other provisions for combustion air are provided, the screen shall have an opening(s) for induction of combustion air.

4 33D4047

Fireplace Screen

PRODUCT FEATURES

Control

Knob

Piezo

Ignition

Figure 1 - Unvented Gas Heater

(Control Access Door Shown Open)

Your vent-free fireplace must be mounted on the floor or on the optional fireplace hearth.

On/Off Switch

OPERATION

This unvented gas heater requires no outside venting and burns cleanly with high heating efficiency.

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

33D4047 5

PRODUCT FEATURES and SPECIFICATIONS

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.

Model Number Type

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

Regulator Pressure Setting 3.5 in. w.c. Pilot Regulator 3.5 in. w.c. Gas Inlet Pressure: Max. 10.5 in. w.c.

Gas Rate

Max BTU/Hr Min BTU/Hr

Milli-Volt Pressure

Min. 5 in. w.c.

Number of

Burners

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 Gas Inlet Pressure:

10 in. w.c. Maximum 13 in." w.c.

Minimum 11 in. w.c.

Model Number Type

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

Gas Rate

Number of

Burners

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 flame height (heat output). Both front and rear burners are in operation to

provide realistic glow and yellow flame.

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

6 33D4047

PRODUCT SPECIFICATIONS and GETTING STARTED

Milli-Volt control has four (4) positions:

provide realistic glow and yellow flame.

PILOT

The gas log heater is fitted 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 ﬁ 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 fiber 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

• 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 ﬁ ber logs to prevent skin irritation

CAUTION

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)

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

33D4047 7

GENERAL INSTALLATION INFORMATION

In planning the installation for the fireplace 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 fireplace 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 connections should only be performed by an experienced, licensed certified tradesman).

4. Install optional ON/OFF kit on units with millivolt control. See installation instructions 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/certified tradesman).

6. Complete finish wall material and/or surround.

A B

DFX24C/DBX24C DFX32C

A 14 213/4 B 131/8 171/2 C 117/8 133/8 D 910 E 21 27 F 47/8 5 G 17 201/4 H 11

I 221/2 283/4

J 11 K 241/2 32 L 45/8 43/4

M 101/2 12 N 261/2 30

Figure 2 - Firebox Dimensions with Screen and Log Sets Removed

8 33D4047

GENERAL INSTALLATION INFORMATION

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

Do not install the heater

• where curtains, furniture, clothing, or other ﬂ ammable objects are less than 42" from the front of the heater.

• in high trafﬁ c areas.

WARNING

• in windy or drafty areas.

ADEQUATE COMBUSTION AND VENTILATION AIR

This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air.

The National Fuel Gas Code defines a confined 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 unconfined space is defined 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 unconfined 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

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;

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

x 10

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

33D4047 9

GENERAL INSTALLATION INFORMATION

Figure 3 - Sample Room for Determining the Maximum Heater Rating

The following formula can be used to determine the maximum heater rating per the definition of unconfined space:

BTU

/Hr =

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

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 =

If the area in which the heater may be operated is smaller than that deﬁ ned as an unconﬁ 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.

(L1 + L2) Ft x (W) Ft x (H) Ft.

1 = 15

(151/2 + 12) x (12) x (8)

/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.

(151/2) x (12) x (8)

x 1000 = 29760

x 1000

x 1000 = 52800

BTU

/Hr

BTU

/Hr

WARNING

10 33D4047

GENERAL INSTALLATION INFORMATION

INSTALLING OPTIONAL FIREBRICK PANELS

1. Remove optional firebrick panels from packaging. Check to See that you have the following:

• 3 firebrick panels • two (2) retainer brackets • two (2) black screws

If any part or parts are missing, contact dealer where you bought fireplace.

2. Turn off fireplace and allow to cool.

3. Remove ﬁ replace screen (See Figure 14, page 14) and logs.

4. Place rear firebrick panel on back wall of firebox. Set bottom of panel behind the bracket tabs of the grate. See

Figure 4.

5. Place one of the side firebrick panels in cabinet. Line up the hole in the retainer clip with the hole inside the firebox. Using Phillips screwdriver, attach the retainer bracket to inside of firebox. See Figure 5.

6. Repeat step five for the other firebrick side panel.

Rear

Firebrick

Panel

Bracket

Tabs

Figure 4 - Installing Back Firebrick Panel

Retainer

Clip

Side Firebrick

Panel

Hole

Screw

Figure 5 - Installing Side Firebrick Panel

33D4047 11

GENERAL INSTALLATION INFORMATION

BLACK TRIM INSTALLATION (DFX24C/DBX24C)

1. Remove black trim from protective packaging. Remove four (4) black screws and 2 (two) 90°-angle trim brackets from owner’s manual packaging.

2. Lay trim on ﬂ oor and match corners of side trims to top trim (See Figure 6).

3. Use one 90°-angle trim bracket to join the corner of one piece of side trim to the corner of the top trim piece (See Figure

6). A rubber hammer or handle of a claw hammer will help secure the corners.

4. Repeat for other side.

NOTE: If you do not attach the trim at the correct corners, use a hammer and screwdriver to tap on

the one end of the 90°-angle bracket. This will separate the two pieces of trim (See Figure 8).

5. Place assembled black trim on front of heater. Using four (4) black screws, secure black trim to sides of heater (See Figure 8).

90°-angle Trim Brackets

Top Trim

Side Trim

Matched Corners

Figure 6 - Matching and Joining Corners of Black

Trim with 90°-angle Trim Brackets

90°-angle Trim Bracket

Assembled

Black Trim

Holes for Black

Screws

Black Screw

Figure 8 - Attaching Assembled Black

Figure 7 - Removing the 90°-angled Trim Bracket

12 33D4047

Trim to Heater

Top Trim Piece

45°-angled

Corners

Back of Trim

Assembly

GENERAL INSTALLATION INFORMATION

BLACK TRIM INSTALLATION (DFX32C)

1. Remove trim from protective packaging. Be careful not to scratch the trim. Remove two (2) 90°-angled mounting brackets and two (2) 90°-angled shims.

2. Lay trim face down on the floor. Line up the 45°-angled corners of the top trim with the 45°-angled corners of the side trims.

Note: Both ends of the top piece of trim are

mitered. See Figure 9.

Side Trim Pieces

Figure 9 - Lining Up Corners of Trim Kit

Outside Corner Slot

90°-angled

Bracket

90°-angled

Shim

Outside

Corner Slot

Figure 10 - Securing Corners Together

Bracket

Screws

No Spaces

where

Corners Join

Figure 11 - Making Sure Corners Are Flush

Assembled Trim

3. Slide one (1) 90°-angled bracket (with attached screws) and one (1) 90°-angled shim in the outside corner slot where the top and side trims meet. See Figure 10.

4. Hold the corners together securely. Tighten screws on bracket with flat head screwdriver. Make sure the corners

are flush and there are no spaces. Do not over tighten screws. See Figure 11.

5. Repeat for other side trim.

6. Slide assembled trim over the top and down the sides of the fireplace. Flush trim with front of fireplace as shown in Figure 12.

7. Align holes in assembled trim with holes in side of fireplace. Using a Phillips screwdriver, attach trim with four (4) screws provided — two for each side of fireplace. Tighten snuggly. See Figure 13.

Screws

Screw

Holes

Trim Flushed

with Front of

Fireplace

Figure 12 - Sliding Assembled Trim Over the Top

of the Heater

33D4047 13

Figure 13 - Securing Trim to Heater with Four (4)

Screws Provided

Screw

GENERAL INSTALLATION INFORMATION

REMOVING SCREEN

1. Remove bottom louver. See Figure 14.

2. Removing fireplace screen frame panel by pushing screen frame panel up and out. See Figure 14.

Do not operate the unit without the screen frame panel and canopy installed.

Canopy

WARNING

Fireplace

Screen

Louver

Figure 14 - Removing Fireplace Screen Frame Panel

NOTE: Fireplace screen must be removed to access log box and to install canopy.

INSTALLING CANOPY

1. Push louvers up and out to remove top louver assembly.

2. Align the black canopy with the holes in the top frame assembly. See Figure 15.

3. Install the three (3) screws (in owner’s manual packaging) which attach the canopy to the top frame assembly. See

Figure 15.

4. Tighten all screws. Make sure the canopy is level and secure. Install top louver assembly.

Screws

Canopy

Figure 15 - Canopy Installation

14 33D4047

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