Monessen Hearth DFX24 User manual

MODELS
DFX24
DBX24*
DFX32
Natural Gas or
Propane/LPG
Manual,Milli-Volt,
or
Thermostat Control
*Thermostat Control Only
This is an unvented gas-fired
heater.It uses air (oxygen) from the
room in which it is installed.
Provisions for adequate combustion
and ventilation air must be provided.
Refer to page 9.
VENT-FREE FIREPLACE SYSTEMS
INSTALLATION AND OPERATING INSTRUCTIONS
READ AND SAVETHESE INSTRUCTIONS
WARNINGS
If the information in this manual is not followed exactly,
a fire or explosion may result causing property damage,
personal injury or loss of life.
–Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
–WHATTO DO IFYOU 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 fire
department.
–Installation and service must be performed by a
qualified installer,service agency or the gas supplier.

2 33D0237
CONTENTS
IMPORTANT SAFETY INFORMATION................................................................................................................3
PRODUCT FEATURES........................................................................................................................................5
PRODUCT FEATURES and SPECIFICATIONS ..................................................................................................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
CHECKING THE BURNER FLAME ...................................................................................................................27
OPERATING INSTRUCTIONS...........................................................................................................................29
FORYOUR SAFETY READ BEFORE LIGHTING .......................................................................................29
MANUAL CONTROL LIGHTING INSTRUCTIONS ......................................................................................30
THERMOSTATIC CONTROL LIGHTING INSTRUCTIONS .........................................................................31
MILLI-VOLT CONTROL LIGHTING INSTRUCTIONS..................................................................................32
MATCH LIGHTING INSTRUCTIONS ...........................................................................................................33
CLEANING and SERVICING .............................................................................................................................33
BLOWER AND OTHER OPTIONAL EQUIPMENT ............................................................................................34
ILLUSTRATED PARTS BREAKDOWN AND CABINET ACCESSORIES ..........................................................35
ILLUSTRATED PARTS BREAKDOWN (DFX24 MILLI-VOLT, DFX24 MANUAL, DFX24 T-STAT)......................36
REPLACEMENT PARTS LIST (DFX24 MILLI-VOLT, DFX24 MANUAL, DFX24 T-STAT)...................................37
ILLUSTRATED PARTS BREAKDOWN (DFX32 MILLI-VOLT, DFX32 MANUAL, DFX32 T-STAT)......................38
REPLACEMENT PARTS LIST (DFX32 MILLI-VOLT, DFX32 MANUAL, DFX32 T-STAT)...................................39
ILLUSTRATED PARTS BREAKDOWN (DBX24 T-STAT) ...................................................................................40
REPLACEMENT PARTS LIST (DBX24T-STAT) ................................................................................................41
TROUBLESHOOTING .......................................................................................................................................42
WARRANTY....................................................................................................................................BACK COVER

33D0237 3
INSTALLER
Please leave these instructions with the owner. OWNER
Please retain these instructions for future reference .
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
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
fire, burns, explosion or carbon monoxide poisoning.
•Do not allow fans to blow directly into the fireplace. Avoid drafts that alter burner
flame patterns.
•Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater.
IMPORTANT SAFETY INFORMATION
1. Due to high temperatures, the heater should be lo-
cated 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 heater
4. Do not place clothing or other flammable material
near the fireplace when the heater is in use.
5. Any safety screen or guard removed for servicing
must be replaced prior to operating the heater.
6. Installation and repair should be done by a quali-
fied service person.
7. To prevent malfunctionand/or sooting, an unvented
gas heater should be cleaned at least annually by a
professional service person. More frequent clean-
ing may be required due to excessive lint from car-
peting, etc. It is imperative that control compart-
ments, 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 ser-
viced as it may not be operating properly.
9. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.l.
10. Thisunit complieswithANSIZ21.11.2b-1998Unvented
Heaters. State and local codes may only allow operation
of this appliance in a vented configuration. Check your
state or local codes.
11. Do not install the DFX Model in a bathroom or bed-
room. The DBX Model may be installed in a bedroom,
but not in a bathroom.
12. Correct installation of the ceramic fiber logs, proper lo-
cation of the heater, and annual cleaning are necessary
to avoid potential problems with sooting. Sooting, re-
sultingfrom improper installationor operation, cansettle
on surfaces outside the fireplace. See log placement in-
structions for proper installation.
13. 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 cre-
ate drafts that alter burner flame patterns. Sooting and
improper burning will occur.
14. This is an unvented gas-fired heater. It uses air (oxygen)
from the room in which it is installed. Provisions for
adequate combustion and ventilation air must be pro-
vided. Refer to Page 9.
15. Keep appliance area clear and free from combustible
materials, gasoline and other flammable vapors and liq-
uids.
16. Unvented gas heaters are a supplemental zone heater.
They are not intended to be a primary heating appli-
ance. Water vapor produced by an unvented heater can
create moisture problems in a home when operated for
extended periods of time.

4 33D0237
17. During manufacturing, fabricating and shipping, vari-
ous components of this appliance are treated with cer-
tain oils, films or bonding agents. These chemicals are
notharmfulbutmayproduce annoyingsmokeand 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
hourswith theburneratthehighestsetting.Provide maxi-
mum 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.
18. 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.
19. 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).
20. The appliance must be isolated from the gas supply pip-
ing system by closing its equipment shutoff valve dur-
ing any pressure testing of the gas supply piping system
at test pressures equal to or less than 1/2 psig (3.5 kPa).
21. 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 un-
der water.
22. This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and se-
vere sooting outside the fireplace.
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 appli-
anceis in operationand, unless otherprovisionsforcom-
bustion air are provided, the screen shall have an
opening(s) for induction of combustion air.
IMPORTANT SAFETY INFORMATION
This appliance may be installed in an aftermar-
ket,permanentlylocated,manufactured(mobile)
home, where not prohibited by local codes.
This appliance is only for use with the type of gas
indicatedon theratingplate.Thisapplianceis not
convertible for use with other gases.

33D0237 5
Control Access Door
Piezo
Ignition
Lighting
Instruction and
Warning Plates
Fireplace Screen
Control
Knob
PRODUCT FEATURES
Your vent-free fireplace must be mounted on the floor or on the optional fireplace hearth.
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.
Figure 1 - Unvented Gas Heater
(Control Access Door Shown Open)

6 33D0237
NATURAL GAS
Manual Pressure/T-Stat Milli-Volt Pressure
Regulator Pressure Setting: 3 in. w.c. Regulator Pressure Setting: 3.5 in. w.c.
Gas Inlet Pressure: Max. 10.5 in. w.c. Pilot Regulator: 3.5 in. w.c.
Min. 5 in. w.c. Gas Inlet Pressure: Max. 10.5 in. w. c.
Min. 5 in. w.c.
PRODUCT FEATURES and SPECIFICATIONS
Propane / LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w. c.
Manual Pressure Milli-Volt Pressure
Regulator Pressure Setting: 10 in. w.c. Regulator Pressure Setting: 10 in. w.c.
Gas Inlet Pressure: Maximum 13 in. w.c. Gas Inlet Pressure: Maximum 13 in." w.c.
Minimum 11 in. w.c. Minimum 11 in. w.c.
Gas Rate Number
Model Number Type Max BTU/Hr Min BTU/Hr of Burners
DFX24NM Manual 22,000 11,000 2
DFX24NT T-stat 22,000 17,000 2
DFX24NV Milli-Volt 22,000 17,000 2
DBX24NT T-stat 10,000 N/A 1
DFX32NM Manual 26,000 15,000 2
DFX32NT T-stat 26,000 20,000 2
DFX32NV Milli-Volt 26,000 20,000 2
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.
LOW -Minimum gas rate — front burner provides a realistic glow on the center log.
HI -Maximum gas rate — front burner provides a realistic glow on the center log, plus the rear burner
provides a pleasing yellow flame.
Gas Rate Number
Model Number Type Max BTU/Hr Min BTU/Hr of Burners
DFX24PM Manual 22,000 11,000 2
DFX24PT T-stat 22,000 17,000 2
DFX24PV Milli-Volt 22,000 17,000 2
DBX24PT T-stat 10,000 N/A 1
DFX32PM Manual 26,000 15,000 2
DFX32PT T-stat 26,000 20,000 2
DFX32PV Milli-Volt 26,000 20,000 2

33D0237 7
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 fitted 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 • One (1) plastic grommet • Four (4) brass 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 fiber logs to prevent skin
irritation from loose fibers. Logs are fragile — handle with care.
CAUTION
PRODUCT SPECIFICATIONS and GETTING STARTED
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.
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 flame height (heat output). Both front and rear burners are in operation to
provide realistic glow and yellow flame.
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)

8 33D0237
J
K
I
E
CD
A
B
H
L
GN
M
F
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. Refer to 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. Refer to 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. Refer to installation instructions included with the kit and
also refer to the “ELECTRICAL WIRING” section found in this manual.
5. Plumbgasline.Refer tothe “CONNECTINGTHE GAS”sectionfound in thismanual.
(Gas connections should only be performed by an experienced, licensed / certified
tradesman).
6. Complete finish wall material and/or surround.
Figure 2 - Firebox Dimensions with Screen and Log Sets Removed
GENERAL INSTALLATION INFORMATION
DFX24/DBX24 DFX32
A211/229
B18 19
C111/2121/2
D10 11
E203/427
F55
G161/2183/4
H11
3/4
I221/2281/2
J11
3/4
K241/232
L51/261/4
M101/212
N261/232

33D0237 9
WARNING
Do not install the heater
•where curtains, furniture,clothing,or other
flammable objects are less than 42" from
the front of the heater.
•in high traffic areas.
•in windy or drafty areas.
GENERAL INSTALLATION INFORMATION
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 m3per 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 m3per 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.
UNUSUALLYTIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTIONWHERE…
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
NewYork, NY 10018
or
National Fire ProtectionAssociation, Inc.
Batterymarch Park
Quincy, MA 02269

10 33D0237
WARNING
If the area in which the heater may be operated is smaller than that defined as an
unconfined 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 definition of unconfined space:
BTU/HR = (L1 + L2) Ft x (W) Ft x (H) Ft x 1000
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1 = 15 1/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/HR = (15 1/2 + 12) x (12) x (8) x 1000
50
= 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 = (15 1/2) x (12) x (8) x 1000
50
= 29760 BTU/HR
GENERAL INSTALLATION INFORMATION
Figure 3 - Sample Room for Determining the Maximum Heater Rating

33D0237 11
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 fireplace 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.
Figure 4 - Installing Back Firebrick Panel
Figure 5 - Installing Side Firebrick Panel
Bracket
Tabs
Rear Firebrack
Panel
Retainer
Clip
Side Firebrick
Panel
Screw
Hole

12 33D0237
GENERAL INSTALLATION INFORMATION
BRASSTRIM INSTALLATION (DFX24/DBX24)
1. Remove brass trim from protective packaging. Remove four (4) brass screws and 2 (two) 90°-angle trim brackets from
owner’s manual packaging.
2. Lay trim on floor 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 brass trim on front of heater. Using four (4) brass screws, secure brass trim to sides of heater (See
Figure 8).
Figure 6 - Matching and Joining Corners of Brass
Trim with 90 ° -angleTrim Brackets
Figure 7 - Removing the 90 ° -angledTrim Bracket Figure 8 - Attaching Assembled
BrassTrim to Heater
Matched Corners
90°-angle Trim Brackets
Assembled
Brass Trim
Brass Screw
Holes for Brass
Screws
Side Trim
Top Trim
90°-angle Trim Bracket

33D0237 13
GENERAL INSTALLATION INFORMATION
45°-angled
Corners
Back of Trim
Assembly
Top Trim Piece
Side Trim Pieces
90°-angled
Shim
90°-angled
Bracket
Outside Corner Slot
Outside
Corner Slot
Bracket
Screws
BRASSTRIM INSTALLATION (DFX32)
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.
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 cor-
ners are flush and there are no spaces.
Do not over
tighten screws. Refer to 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 fire-
place. Using a Phillips screwdriver, attach trim with four
(4) screws provided — two for each side of fireplace.
Tighten snuggly. Refer to Figure 13.
Figure 10 - Securing CornersTogether
Figure 11 - Making Sure Corners Are Flush
Assembled Trim
No Spaces
where
Corners Join
Figure 13 - SecuringTrim to Heater with Four (4)
Screws Provided
Screws
Screw
Screw
Figure 12 - Sliding Assembled Trim Over theTop
of the Heater
Figure 9 - Lining Up Corners ofTrim Kit
Trim Flushed
with Front of
Fireplace
Holes

14 33D0237
REMOVING SCREEN
Removing fireplace screen frame panel by pushing screen frame panel up and out. Refer Figure 14.
Do not operate the unit without the
screen frame panel and canopy
installed.
GENERAL INSTALLATION INFORMATION
Figure 15 - Canopy Installation
INSTALLING CANOPY
1. Remove the fireplace screen as described in the previous section.
2. Align the black canopy with the holes in the top frame assembly. Refer to Figure 15.
3. Install the three (3) screws (in owner’s manual packaging) which attach the canopy to the top frame assembly. Refer to
Figure 15.
4. Tighten all screws. Make sure the canopy is level and secure. Install the fireplace screen.
Figure 14 - Removing Fireplace Screen Frame Panel
NOTE: Fireplace screen must be removed to access log box and to install canopy.
WARNING
Canopy
Fireplace
Screen
Canopy
Screws

33D0237 15
GENERAL INSTALLATION INFORMATION
SECURING HEATERTO FLOOR OR HEARTH
Note: Clearance requirements as detailed in “CLEARANCES and HEIGHT REQUIREMENTS”section on
page 17 of this manual, must be met before securing the heater in place.
To prevent movement, the heater must be secured to the floor or hearth.
1. Open the control access door and remove the screen.
2. Remove carton containing the four-log set.
3. To remove the grate and base assembly, take out two (2) screws as shown in Figure 16.
4. Lift grate and base assembly out of the firebox.
CAUTION: Lift grate and base assembly using the grate only.
5. Secure the firebox with two anchoring screws (3/16" x 11/4" length) supplied with the fireplace system. Refer to Fig-
ure 17.
Note: If the unit is mounted on carpeting, tile or combustible material without the hearth, a metal or
wooden base covering the entire width and depth of the base must be installed.
Figure 16 - Removing Grate
Figure 17 - Securing Heater to Floor or
Hearth
Grate
Screws
3/16" x 1 1/4"
Anchor Screws

16 33D0237
LOCATION OF FIREPLACE
Carefully select the best location for installation of your unvented fireplace. The following factors should be taken into
consideration.
•Clearance to side wall, ceiling, woodwork and window or other combustibles. Refer to “CLEARANCES and HEIGHT
REQUIREMENTS” section on page 17. Minimum clearances to combustibles must be maintained.
•Location must not be affected by drafts caused by kitchen exhaust fans, ceiling fans, return air registers for forced air
furnaces / air conditioners, windows or doors.
•Installation must provide adequate ventilation and combustion air.
•DO NOT INSTALL THE DFX MODEL IN A BEDROOM OR BATHROOM.
THE DBX MODEL MAY BE INSTALLED IN A BEDROOM, BUT NOT IN A BATHROOM.
•Location should be out of high traffic areas and away from furniture and draperies due to heat from firebox.
•Never obstruct the front opening of the unvented fireplace or restrict the flow of combustion and ventilation air.
•Minimize modifications to existing construction. Refer to Figure 18 below for location suggestions.
•Do not install in the vicinity where gasoline or other flammable liquids may be stored. The unvented firebox must be
kept clear and free from the combustible materials.
Figure 18 - Suggested Locations

33D0237 17
9"
Minimum
42"
Minimum
9"
Minimum
12"
2 1/2"
10"
19"
15"
Minimum
42"
Minimum
15"
Minimum
The dimensions shown in Figures 19 through 21 are minimum clearances to maintain
in installing this heater. Left and right clearances are determined when facing the
front of the heater.
Follow these instructions carefully to ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
CLEARANCES and HEIGHT REQUIREMENTS
WARNING
Figure 21 - Minimum Mantel
Clearances
Canopy
Ensure that minimum clearances shown in Figures 14 and 15
aremaintained. Left andright clearances aredetermined when
facing the front of the firebox.
Follow these instructions carefully to ensure safe installation.
Failure to follow these requirements may create a fire hazard.
1. Sidewall Clearances — The clearance from the in-
side of the appliance to any combustible adjacent wall
should not be less than 9" for the DBX24/DFX24 or
less than 15" for the DFX32. Refer to Figures 19 and
20.
2. Ceiling Clearance —The ceiling must be at least 42"
from the top of the firebox opening. Refer to Figures 19
and 20.
3. BackWall Clearance —The appliance maybeplaced
against a combustible back wall.
4. Floor Clearance —The fireplace may not be installed
onto any combustible flooring material, such as carpet-
ing, vinyl or tile without the hearth or a min. 22 Ga
(0.030") metal or a minimum 1/2" wooden base covering
the entire width and depth of the base.
5. Mantel clearances — The canopy supplied with the
unit must be installed. If a combustible mantel is in-
stalled. It must meet the clearance requirements detailed
in Figure 21.
Figure 19 - Clearances and Height Requirements
for DFX24/DBX24 Figure 20 - Clearances and Height Requirements for DFX32

18 33D0237
DFX24 DBX24 DFX32
A243/4243/4321/2
B263/4263/4301/4
C211/2211/2291/4
D111/8111/8141/2
E421/2421/2533/4
F21 21 263/4
G101/2101/2121/4
H297/8297/8377/8
FIREPLACE FRAMING
If unit is to be “built in”, fireplace framing can be built before or after the appliance is set in place. BE SURE THAT ALL
PACKING MATERIAL HAS BEEN REMOVED FROMTHE UNDERSIDE OF THE UNIT PRIOR TO SETTING
THE FIREBOX IN PLACE. Construct fireplace framing following Figures 22 through 25. Refer to Figure 2 on page 8 for
fireplace dimensions. The framing headers may rest directly on top of the firebox.
The fireplace may be installed directly on a combustible floor or a raised platform of an appropriate height. Do not place
fireplace on carpeting, vinyl, tile or other soft floor coverings. It may, however, be placed on flat wood, plywood, particle
board or other hard surfaces. Be sure fireplace rests on a solid continuous floor or platform with appropriate framing for
support and so that no cold air can enter from under the firebox.
Anchor fireplace to the side framing members using nailing flanges.
H
G
D
F
E
A
C
C
G
A
B
A
C
A
G
Figure 22 - Corner Installation
Figure 23 - Inside Chase Installation
Figure 25 - Recessed Installation
Figure 24 - Stud Location
Unfinished/rough
framing surface
Unfinished/rough
framing surface
Unfinished/rough
framing surface
5/8" or
equivalent
clearance
for drywall/
finishing
materials
5/8" or equivalent
clearance for
drywall/finishing
materials

33D0237 19
H
J
Nail Sides
Through Nailing
Flanges
1. Bend out the nailing flanges located on each side of the firebox.
2. Slide the firebox into prepared framing or position firebox in its final position and frame later.
3. Level the firebox by checking the top edge of the firebox. Shim if necessary.
4. Anchor firebox to the side framing members using 8d nails or other suitable fasteners. Refer to Figure 27.
5. The canopy must be installed for safe operation of the heater. Refer to page 14 for canopy installation details.
When finishing a custom cabinet, mantel, or other built-in enclosure,
the opening size to accommodate the fireplace with trim installed is
as follows:
FIREPLACE FRAMING
DFX24 w/ trim DBX24 w/ trim DFX32 w/trim
H243/4243/43213/16
J263/4263/4311/4
The fireplace must be installed giving
full consideration to the clearance and
height requirements identified in this
manual.
WARNING
Figure 26 - Custom Cabinet
Figure 27 - Location of Nailing Flanges

20 33D0237
Pipe Coupling
To Heater
Valve
3"
Minimum
CAUTION
Use new black iron pipe,steel pipe,copper tubing or internally tinned copper tubing.
Internally tinned copper tubing can only be used per National Fuel Code, section
2.6.3, providing gas meets sulfide limits, and where permitted by local codes. Gas
piping system must be sized to provide minimum inlet pressure (listed on Data
Plate) at the maximum flow rate (BTU/Hr).Undue pressure loss will occur if the pipe
is too small.
A manual shutoff valve must be installed upstream of the appliance. Union tee and
plugged 1/8" NPT pressure tapping point should be installed upstream of the
appliance.
Refer to Figure 28.
A sediment trap should be installed upstream to prevent moisture and contaminants
from passing through the pipe to appliance controls and burners. Failure to do so
could prevent the appliance from operating reliably. Refer to Figure 28.
CONNECTINGTHE GAS
NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local
codes.
IMPORTANT:
Loosen the pipe adapter on the flex tube before installing to the system piping.
CHECK GASTYPE: The gas supply must be the same as stated on the heater’s rating plate. If the gas supply is different,
DO NOT INSTALL THE HEATER. Contact your dealer for the correct model.
Always use an external regulator for all propane/LPG heaters only, to reduce the supply tank pressure to a maximum of
13" w.c. This is in addition to the internal regulator in the heater valve.
Manual Shutoff
Valve
Pipe
Tee Joint
Sediment Trap Pipe Nipple
Cap
Stainless
Flexible Tube
Figure 28 - Gas Connection