Monessen Hearth DFX24, DBX24, DFX32, DFX24NM, DFX24NT Installation And Operating Instructions Manual
...
VENT-FREE FIREPLACE SYSTEMS
INSTALLATION AND OPERATING INSTRUCTIONS
MODELS
DFX24
DBX24*
DFX32
Natural Gas or
Propane/LPG
Manual, Milli-V olt,
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.
WARNINGS
If the information in this manual is not followed e xactl y,
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.
– WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switc h; do not use an y
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 .
READ AND SAVE THESE INSTRUCTIONS
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
FOR YOUR 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 (DBX24 T-STAT) ................................................................................................ 41
TROUBLESHOOTING .......................................................................................................................................42
WARRANTY....................................................................................................................................BACK COVER
2
33D0237
IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the owner.
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
•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.
WARNING
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater.
1. Due to high temperatures, the heater should 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 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 qualified service person.
7. To prevent malfunction and/or sooting, an unv ented
gas heater should be cleaned at least annually by a
professional service person. More frequent cleaning may be required due to excessive lint from car peting, 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 . Ha ve the heater serviced 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.
OWNER
Please retain these instructions for future reference
10. This unit complies with ANSI Z21.11.2b-1998
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 bedroom. The DBX Model may be installed in a bedroom,
but not in a bathroom.
12. 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.
13. A void any drafts tha t alter burner flame patterns. Do not
allow fans to blo w 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.
14. This is an unvented g as-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.
15. Keep appliance 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. Water vapor produced by an unvented heater can
create moisture problems in a home when operated for
extended periods of time.
.
Unvented
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3
IMPORTANT SAFETY INFORMATION
17. 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 oper ation 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.
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).
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.
20. 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).
21. Do not use this room heater if any part has been under
water. Immedia tely 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.
22. This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and severe sooting outside the fireplace.
23. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
24. Always have a f ireplace 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
33D0237
Fireplace Screen
PRODUCT FEATURES
Lighting
Instruction and
Warning Plates
Piezo
Ignition
Control
Knob
Control Access Door
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.
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.
33D0237
5
PRODUCT FEATURES and SPECIFICATIONS
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.
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
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
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
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.
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33D0237
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.
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 lev el be gins to drop belo w a satisfactor y lev el. The pilot can only be r elit
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
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 y ou have all par ts in good
condition.
What you will need for installation:
irritation from loose fibers. Logs are fragile — handle with care.
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)
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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. Refer to the “LOCATION OF FIREPLA CE” 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. Plumb gas line. Refer to 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
C
D
E
F
DFX24/DBX24 DFX32
A 211/2 29
B 18 19
C 111/2 121/2
D 10 11
E 203/4 27
F 55
G 161/2 183/4
H 11
I 221/2 281/2
J 11
K 241/2 32
L 51/2 61/4
M 101/2 12
N 261/2 32
3
/4
3
/4
M
G
H
L
Figure 2 - Firebox Dimensions with Screen and Log Sets Removed
8
N
I
J
K
33D0237
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
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
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.
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 m
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.
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
a) walls and ceilings exposed to the outside a tmosphere ha v e a continuous water va por 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;
3
per kw) of the aggregate input rating of all appliances installed in that space. An unconf ined space is def ined as
11
x 10
kg per-pa-sec-m2) or less with openings gasketed or sealed, and
between wall-ceiling joints; between wall panels; at penetrations for plumbing, electrical, and gas lines; and at other
openings.
33D0237
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 = (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
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.
WARNING
10
33D0237
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 brac ket tabs of the grate. See F igure 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 Firebrack
Panel
Bracket
Tabs
Figure 4 - Installing Back Firebrick Panel
Hole
Retainer
Clip
Screw
Side Firebrick
Panel
33D0237
Figure 5 - Installing Side Firebrick Panel
11
GENERAL INSTALLATION INFORMATION
BRASS TRIM INSTALLATION (DFX24/DBX24)
1. Remove brass trim from protecti v e packaging. Remov e f our (4) brass scre ws and 2 (two) 90°-angle trim brack ets 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 F igur e
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).
90°-angle Trim Brackets
Top T rim
Side T rim
Matched Corners
Figure 6 - Matching and Joining Corners of Brass
Trim with 90°-angle T rim Brackets
90°-angle Trim Bracket
Assembled
Brass Trim
Figure 7 - Removing the 90°-angled T rim Bracket
12
Holes for Brass
Screws
Brass Screw
Figure 8 - Attaching Assembled
Brass Trim to Heater
33D0237
GENERAL INSTALLATION INFORMATION
BRASS TRIM INSTALLATION (DFX32)
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
Top T rim Piece
45°-angled
Corners
Back of Trim
Assembly
Side T rim Pieces
1. Remove trim from protective packaging.
not to scratch the trim.
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.
Remove two (2) 90°-angled
Be careful
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 corners are flush and there are no spaces.
tighten screws.
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 fir eplace as shown
in Figure 12.
7. Align holes in assembled trim with holes in side of fireplace. Using a Phillips screwdriv er, attach trim with four
(4) screws provided — two for each side of fireplace.
Tighten snuggly. Refer to Figure 13.
Refer to Figure 11.
Do not over
No Spaces
where
Corners Join
Figure 11 - Making Sure Corners Are Flush
Assembled T rim
Trim Flushed
with Front of
Fireplace
Figure 12 - Sliding Assembled Trim Over the Top
of the Heater
Screws
Screw
Holes
Screw
Figure 13 - Securing Trim to Heater with Four (4)
Screws Provided
33D0237
13
GENERAL INSTALLATION INFORMATION
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.
Canopy
WARNING
Fireplace
Screen
Figure 14 - Removing Fireplace Screen Frame Panel
NOTE: Fireplace screen must be removed to access log box and to install canopy.
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 o wner’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.
Canopy
Screws
Figure 15 - Canopy Installation
14
33D0237
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