Monessen Hearth DIS33 Installation And Operating Instructions Manual
VENT-FREE FIREPLACE SYSTEMS
INSTALLATION AND OPERATING INSTRUCTIONS
MODEL: DIS33
Natural Gas or Propane/LPG
Control Type: Milli-Volt, T-Stat, or
Hi/Lo Remote Control
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. See page 9.
WARNINGS
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.
– 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
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
Operation ..............................................................
Natural Gas ..........................................................
Propane/LPG ........................................................
Specifications ...........................................................
Ignition Controls ....................................................
Pilot .......................................................................
Thermal Generator ...................................................6
Getting Started ..........................................................7
General Installation Information .............................8
Removing Screen .................................................
Installing Canopy ..................................................
Codes ...................................................................
Adequate combustion and Ventilation Air .............
Clearances and Height Requirements ..................11
Fireplace Framing ..................................................14
Securing Heater to Floor ........................................15
Connecting the Gas ................................................16
Checking Gas Pressure .........................................18
Electrical Wiring (Milli-Volt) ...................................
Electrical Wiring (Fan) ............................................
5
Log Placement ........................................................22
6
Fame Appearance ...................................................
6
Checking the Burner Flame ...................................24
6
Operating Instructions ...........................................25
6
What to Do if You Smell Gas ..............................
6
Hi/Lo Control Lighting Instructions ......................26
Milli-Volt Control Lighting Instructions .................
Match Lighting Instructions .................................
Cleaning and Servicing ..........................................29
8
Troubleshooting .....................................................
8
Illustrated Parts Breakdown ..................................32
9
Fireplace Assembly ...........................................
9
Gratre and Base Assembly ................................
Logs ...................................................................36
Warranty ..................................................
Back Cover
19
21
23
25
27
28
30
32
34
2 26D3311
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 where applicable.
1. Due to high temperatures, the appliance 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.
OWNER
Please retain these instructions for future reference
9. The installation must conform with local codes or, in the
absence of local codes, with the National Fuel Gas Code,
ANSI Z223.l/NFPA54.
10. This unit complies with ANSI Z21.11.2-2001 Unvented
Heaters.
11. Do not install the heaters in a bathroom or bedroom.
.
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.
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 and at least
annually by a professional service person. More fre
quent cleaning may be required due to excessive lint
from carpeting, bedding materials, 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.
-
12. Correct installation of the ceramic fiber logs, proper loca
tion of the heater, and annual cleaning are necessary to
avoid potential problems with sooting. Sooting, resulting
from improper installation or operation, can settle on surfaces outside the fireplace. See log placement instructions
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
create drafts that alter burner flame patterns. Sooting and
improper burning will occur.
14. Caution: Candles, incense, oil lamps, etc. produce com-
bustion byproducts 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.
15. 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.
See page 9.
-
26D3311 3
16. Keep room area clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
Continued on page 4
IMPORTANT SAFETY INFORMATION
Continued from page 3
17. Unvented gas heaters are a supplemental zone heater. They
are not intended to be the primary heating appliance.
18. 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, addi
tional mechanical ventilation is recommended.
19. 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.
20. 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.
21. 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.
We suggest that our gas hearth
products be installed and
serviced by professionals who
are certified in the U.S. by the
National Fireplace Institute®
(NFI) as Gas Specialists.
www.nficertified.org
Never connect unit to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
WARNING
22. 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).
23. 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.
24. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
25. Always have a fireplace screen in place when the appliance
is in operation and, unless other provisions for combustion
air are provided, the screen must have an opening(s) for
induction of combustion air.
4 26D3311
Optional
Face Plate
Fireplace
Screen
PRODUCT FEATURES
Control Access Door
Control Knobs
On/Off Switch
Piezo Ignitor
Optional T-Stat
Sensor
Optional Blower
Figure 1 - Unvented Gas Heater with Control Access Door Open
Your vent-free fireplace must be mounted to the floor or the fireplace hearth.
OPERATION
This unvented gas heater requires no outside venting and burns cleanly with high heating efficiency.
26D3311 5
PRODUCT FEATURES AND SPECIFICATIONS
NATURAL GAS
Milli-Volt and T-Stat Pressure Hi/Lo Pressure
Regulator Pressure Setting: 3.5" w.c. Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c. Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Max. 10 1/2" w. c. Gas Inlet Pressure: Max. 11" w.c.
Min. 5" w.c. Min. 6" w.c.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DIS33NTD MILLI-VOLT 28,000 18,000
DIS33NVD T-STAT 28,000 18,000
DIS33NHD HI/LO REMOTE 28,000 18,000
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
Milli-Volt and T-Stat Pressure Hi/Lo Pressure
Regulator Pressure Setting: 10" w.c. Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Max. 13" w.c. Gas Inlet Pressure: Max. 13: w.c.
Min. 11" w.c. Min. 12" w.c.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DIS33PTD MILLI-VOLT 28,000 20,000
DIS33PVD T-STAT 28,000 20,000
DIS33PHD HI/LO REMOTE 28,000 21,000
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Hi/Lo valve control has four (4) positions:
OFF - All gas to the gas logs is shut off at the valve.
PILOT - Valve position to light/maintain a standing pilot.
ON - Valve position to turn ON.
HI/LOW - Variable position corresponding to desired flame height back to pilot.
Milli-Volt and T-Stat 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 (ODS assembly) 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.
6 26D3311
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:
• Installation/Operating instructions • Black Louvers
• 33" unvented gas heater with simulated brick panels. • Canopy
• Plastic bag containing crushed volcanic rock • Two (2) anchoring screws
• Mounting screws for canopy • Remote Control (Hi/Lo Model Only)
• Log box contains a four (4) piece log set, refer to installation instructions
Accessory face plates available to finish the insert.
• DIFACESM Black small face 33"H x 43"W • DIFACELG Black large face 36"H x 50"W
Accessories include brass trim and mounting hardware
The milli-volt controlled version of this heater is the only style designed to be operated with optional devices for ON/OFF
functions. The following options may be used with the milli-volt controlled heater. These options are
log set.
• Hand held Remote with Receiver • Wall switch with 15' wire. • Wall T-stat with 15' wire.
• Hand held Thermostat Remote with Receiver • Thermostat Sensor
not packaged with the
• 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.
WARNING
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 / L.P.G. and 1/2 lb. Natural Gas Systems only)
• Piping which complies with local codes • Sediment trap
• Tee joint • Pipe wrench or appropriate size crescent wrench set
• Phillips head screwdriver • Drill with 5/32" bit
• Optional face plate kit. • Manual shutoff valve
• Optional trim kit for installation into wall or free standing Mantle without three piece faceplate
• Pipe sealant approved for use with propane / LP.G (Resistant to sulfur compounds)
26D3311 7
GENERAL INSTALLATION INFORMATION
REMOVING SCREEN
Remove fireplace screen by pushing screen frame panel up
and out. See Figure 2.
Do not operate the unit without
the screen frame panel and canopy
installed.
WARNING
NOTE: Fireplace screen must
be removed to access log box
and to install canopy.
Figure 2 - Removing Fireplace Screen
INSTALLING CANOPY
1. Remove the fireplace screen as described in the previous section.
2. Align canopy with the holes in the top frame assembly. See Figure 3.
3. Install the five (5) screws (in ownerʼs manual packaging) which attach the canopy to the top frame assembly. See
Figure 3.
4. Tighten all screws. Make sure the canopy is level and secure. Install the fireplace screen.
Figure 3 - Installing Canopy
8 26D3311
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, (ANSI Z223.1/NFPA54), defines a confined space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8 m
an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m
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 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 sealants are applied to areas such as joints around window and door frames, between sole plates and floors,
between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other
openings.
3
per kw) of the aggregate input rating of all appliances installed in that space and
3
per kw) of the
26D3311 9
W
H
GENERAL INSTALLATION INFORMATION
Figure 4 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
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 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/Hr = (151/2 + 12) x (12) x (8)
x 1000 = 52800 BTU/Hr
50
If there were a door between the two rooms the calculation would be based only on the room with the heater.
BTU/Hr = (151/2) x (12) x (8)
x 1000 = 29760 BTU/Hr
50
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/NFPA54, Section 5.3 or applicable local codes.
WARNING
WARNING
10 26D3311
3
3"
17
"
23
5
/
8
"
2
4"
B
A
1
5
"
Minim
u
m
1
5
"
Mini
mu
m
42
"
Min
imu
m
3
"
Mi
n
i
m
u
m
CLEARANCES AND HEIGHT REQUIREMENTS
The dimensions shown in Figures 5 and 8 and defined in the fireplace manufacturer's
instructions are minimum clearances to maintain when 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
WARNING
instructions exactly can create a fire hazard.
NOTE: Clearances are necessary to combustible
surfaces only. No clearance is necessary for
noncombustible surface.
Sidewall and ceiling clearances: The clearance from
the inside of the appliance to any combustible adjacent wall
should no be less than 15". See Figure 5.
Ceiling clearance: The ceiling must be at least 42" from
the top of the firebox opening. See Figure 5.
Back wall clearance: The appliance must be placed at
least 3" away from a combustible back wall.
Floor clearance: The fireplace may not be installed onto
any combustible flooring material, such as carpeting, vinyl or
tile without the hearth or a minimum 22 GA (0.030") metal
or a minimum 1/2" wooden base covering the entire width
and depth of the base.
Mantel clearances: The canopy supplied with the unit
must be installed. If a combustible mantel is installed. It must
meet the clearance requirements shown in Figure 8.
Figure 5 - Sidewall and Ceiling Minimum
Clearances
Accessory Face Plates
A B
Small 33" 43"
Large 36" 50"
Figure 6 - Dimensions for Installing in
Masonry Fireplace in a UL Listed Box
26D3311 11
BEFORE INSTALLING THE FIREPLACE INSERT
Have fireplace floor and chimney professionally cleaned to
remove ashes, soot, creosote or other obstructions. Close and
seal any fresh air vents or ash clean-out doors located on
floor or wall
10"
12"
14"
26"
8"
12"
10"
8"
6"
2
1
/2"
8" or More
of Heat
Resistant
Material
Heater in
Fireplace or
Firebox
Hood
Minimum
of 8" Heat
Resistance
Material
Hood
8"
4"
21/2"
10"
6"
8"
CLEARANCES and HEIGHT REQUIREMENTS
HEAT RESISTANT MATERIAL (MINIMUM REQUIREMENTS) WITH NO WOODEN MANTEL OR OTHER COM
BUSTIBLE PROJECTION
Heat resistant material (minimum requirements) with wooden mantel
or other combustible projection:
To install the heater with a wooden mantel shelf or other combustible
projection above, first measure the heat resistant material shown in
Figure 7.
-
Example: A mantel may
project from the wall
1
a maximum of 2
/2" at
minimum of 8" above
the opening, and a maximum of 12" at a minimum of 26" above the
opening.
Figure 7 - Measuring Heat Resistant
Material for Mantel
Figure 9 - Unsafe Mantel Clearance
Figure 8 - Minimum Mantel Clearance
Figure 9 is an example of an unsafe mantel installation. The
mantel projects 4" at 8" above the opening, exceeding the maximum acceptable distance of 21/2". The mantel also projects 8"
at 10" above the opening, exceeding the maximum acceptable
distance of 6".
If your mantel profile is unsafe, you may either:
• Raise the mantel to an acceptable height or,
• Remove the mantel.
12 26D3311
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