Monessen Hearth BTU-Hr User Manual
VENT-FREE HEARTH HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
DHHP/NT
Natural Gas or Propane/LPG
15,000 to 30,000 Btu/Hr
with Thermostat
Shown with Optional Mantel
Which Features a Built-In Base
Warning: This is an unvented gasfired 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 8.
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.
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 su p p l i e r 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.
Improper installation, adjustment, alteration, service, or
maintenance can cause injury or property damage. Refer
to this manual for correct installation and operational
procedures. For assistance or additional information
consult a qualified installer, service agency, or the gas
supplier.
READ AND SAVE THESE INSTRUCTIONS
49D0090 3
CONTENTS
Important Safety Information ..........................3
Specifications ................................................... 5
Local Codes ...................................................... 5
Product Identification ...................................... 6
Safety Device................................................ 6
Piezo Ignition System ................................... 6
Thermostat Heat Control............................... 6
Assembly ......................................................... 6
Installing Hood .............................................. 6
Installing Logs ............................................... 7
Attaching Brass Front Trim ........................... 8
Fresh Air for Combustion and Ventilation ..... 8
Providing Adequate Ventilation ..................... 8
Determining Fresh-Air Flow for Heater
Location ........................................................ 9
Ventilation Air .............................................. 10
Installation ...................................................... 12
Locating Heater........................................... 12
Installation Options ..................................... 13
Connecting to Gas Supply .......................... 17
Operating Instructions................................... 19
For Your Safety Read Before Lighting ........ 19
Lighting Instructions .................................... 20
To Turn Off Gas to Heater........................... 21
Thermostat Control Operation .................... 21
Match Lighting Instructions ......................... 21
Inspecting Heater ........................................... 22
Pilot Flame Pattern ..................................... 22
Burner Flame Pattern.................................. 22
Troubleshooting ............................................. 23
Cleaning and Maintenance ............................ 26
Illustrated Parts List....................................... 27
Accessories .................................................... 28
Warranty.......................................... Back Cover
2 49D0090
IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the owner.
OWNER
Please retain these instructions for future reference
.
IMPORTANT
Read this owner’s manual carefully and completely before trying to assemble, operate, or service this heater.
Improper use of this heater can cause serious injury or death from burns, fire, explosion, electrical shock, and
carbon monoxide poisoning.
• 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 heater. Avoid any drafts that alter burner
flame patterns. Ceiling fans can create drafts that alter burner flame patterns. Altered
WARNING
burner patterns can cause sooting.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved for
use with this heater where applicable.
CARBON MONOXIDE POISONING: Early signs of carbon monoxide poisoning are similar to the u 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. Get fresh air at once! Have heater serviced. Some people are more affected by carbon monoxide than
others. These include pregnant women, people with heart or lung disease or anemia, those under the inuence of alcohol,
and those at high altitudes.
Propane/LP Gas and Natural Gas: Propane/LP gas and natural gas is odorless. An odor-making agent is added to gas.
The odor helps you detect a gas leak. However, the odor added to gas can fade. Gas may be present even though no odor
exists.
Make certain you read and understand all warnings. Keep this manual for reference. It is your guide to safe and proper
operation of this heater.
1. Due to high temperatures, the appliance should be
located out of trafc and away from furniture and draperies.
2. Surface of heater becomes very hot when running heater.
Keep children and adults away from hot surfaces to avoid
burns or clothing ignition. Heater will remain hot for
a time after shutdown. Allow surfaces to cool before
touching.
3. Carefully supervise young children when they are in the
same room with the apliance.
4. Do not place clothing or other ammable material on
or near the appliance. Never place any objects on the
heater.
5. Make sure screen is in place before running heater.
6. Installation and repair should be done by a qualied
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. Keep the appliance area clear and free from combustible
materials, gasoline, and other ammable vapors and
liquids.
Continued on page 4
49D0090 3
49D0090 5
IMPORTANT SAFETY INFORMATION
Continued from page 3
10. 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.
11. Do not place propane/LP supply tank(s) inside any structure. Locate propane/ LP supply tank(s) outdoors.
12. If you smell gas
• shut off gas supply
• 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 reachyour gas supplier, call the re depart-
ment
13. This heater shall not be installed in a bedroom or bath-
room.
14. This heater needs fresh, outside air ventilation to run
properly. This heater has an Oxygen Depletion Sensing
(ODS) safety shutoff system. The ODS shuts down the
heater if not enough fresh air is available. See “Air For
Combustion and Ventilation,” pages 8 through 10.
15. Before using furniture polish, wax, carpet cleaner, or
similar products, turn heater off. If heated, the vapors
from these products may create a white powder residue
within burner box or on adjacent walls or furniture.
16. If heater shuts off, do not relight until you provide fresh,
outside air. If heater keeps shutting off, have it serviced.
17. Do not run heater
• where ammable liquids or vapors are used or stored.
• under dusty conditions.
18. Do no t use heater if any part has been under water. Immediately call a qualied 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.
19. To prevent the creation of soot, follow the instructions in
“Cleaning and Maintenance,” page 26.
23. This unit complies with ANSI Z21.11.2-2001 Unvented
Heaters.
24. Caution: Candles, incense, oil lamps, etc. produce combustion byproducts including soot. Vent-free appliances
will not lter 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.
25. 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.
26. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, lms 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.
27. 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).
28. 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).
29. This appliance is not a zero clearance replace. Do not
frame this replace into a wall.
20. Turn off and unplug heater and let cool before servicing.
Only a qualied service person should service and repair
heater.
21. Operating heater above elevations of 4,500 feet could
cause pilot outage.
22. To prevent performance problems, do not use a propane/
LP fuel tank of less than 100 lbs. capacity.
4 49D0090
SPECIFICATIONS AND LOCAL CODES
NATURAL GAS
NOTE: An external regulator is required to reduce supply pressure to a maximum of 101/2" W.C. on
natural gas systems operating at higher pressure.
Thermostat Pressure
Regulator Pressure Setting: 4" w.c.
Gas Inlet Pressure: 101/2" w.c.
Min. 5" w.c.
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" W.C.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DHHNT THERMOSTAT 30,000 15,000
Thermostat Pressure
Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Max. 13" w.c.
Min. 11" w.c.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DHHPT THERMOSTAT 30,000 15,000
LOCAL CODES
Follow all local codes. In the absence of local codes, use the latest edition of The National Fuel Gas Code, ANS Z223.1, also
known as NFPA 54. Available from:
American National Standards Institute, Inc. National Fire Protection Association, Inc.
1430 Broadway Batterymarch Park
New York, NY 10018 Quincy, MA 0226
49D0090 5
49D0090 7
PRODUCT IDENTIFICATION AND ASSEMBLY
SAFETY DEVICE
This heater has a pilot with an Oxygen Depletion Sensing
(ODS) safety shutoff system. The ODS/pilot is a required
feature for vent-free room heaters. The ODS/pilot shuts
off the heater if there is not enough fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system requires no
matches, batteries, or other sources to light heater.
THERMOSTAT HEAT CONTROL
This heater has a thermostat sensing bulb and a control
valve. This results in the greatest heater comfort. This
can also result in lower gas bills.
NOTE: Do not remove Lighting and Warning
Plates from heater.
Hood
Screen
Control
Knob
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging applied to heater
for shipment.
3. Make sure your heater includes the following:
trim
hood
mounting bracket
hardware package which includes:
two (2) 90° angled brackets and shims
four (4) trim screws
three (3) hood screws
two (2) wall mounting screws
two (2) wall spacers
4. Check heater for any shipping damage. If heater is
damaged, promptly inform dealer where you bought
heater.
ASSEMBLY
INSTALLING HOOD
Piezo
Ignitor
Door
Optional Blower
On/Off Switch
Figure 1 - Vent-Free Gas Log Space Heater
Screws
Deflector
1. Remove hood from protective package.
2. Locate three (3) black sheet metal screws inside homeowner’s manual pack.
3. Place hood on deector and line up holes (see Figure 2).
4. Secure hood to deector with three (3) black sheet metal
screws.
NOTE: Side of hood should be on the outside flange
of deflector.
6 49D0090
Figure 2 - Installing Hood
Hood
ASSEMBLY
INSTALLING LOGS
NOTE: For easier installation, lay heater on its back.
1. Slide screen up to remove.
2. Remove log from inside of base. Discard protective packaging.
3. Gently slide log on log retaining pin on base assembly (see
Figure 3). The log should t rmly against bottom of log
retaining pin.
4. Place front log in front of burner and behind burner shield.
5. Reattach screen.
WARNING: Always have burner shield
and screen in place before operating
heater. This prev ents excessi ve
temperatures on heater.
Failure t o position t he parts in
accordance with these diagrams or
WARNING
failure to use only parts specifically
approved with this heater may result in
property damage or personal injury.
ATTACHING BRASS FRONT TRIM TO
FRONT PANEL
If any part or parts are missing, contact dealer where you bought
the heater.
Burner
Shield
Side
Brass Trim
Figure 4 - Assembling Bras Trim
Back
Log
Pins
Figure 3 - Installing Logs
Adjusting
Plate
Set
Screws
Shim
Slot
Mitered
Edges
Top Brass
Slot
Front
Log
Trim
1. Remove brass trim from protective packaging. Remove two
(2) 90°-angled mounting brackets and two (2) 90°-angled
shims.
2. Lay trim on the oor face down. Line up the corners with the
top trim at the top and the side trims on the sides.
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. Next, slide another bracket and shim
to the inside corner slot. See Figure 4.
4. Hold the corners together securely. Tighten screws on both
brackets with at head screwdriver. Make sure the corners
are ush and there are no spaces.
5. Repeat steps 2 through 4 for other side trim.
7. Place the assembled trim on front of heater cabinet. Attach
on top and sides with four brass screws included in hardware
package. See Figure 5.
49D0090 7
Screws
Assembled
Brass Trim
Screws
Figure 5 - Attaching Brass Trim to Heater
49D0090 9
FRESH AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall not be installed in a confined space or unusually tight
construction unless provisions are provided for adequate combustion and ventilation
air. Read the following instructions to insure proper fresh air for this and other fuelburning appliances in your home.
WARNING
Today’s homes are built more energy efcient than ever. New materials, increased insulation, and new construction methods
help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out
and the warm air in. During heating months, home owners want their homes as airtight as possible.
While it is good to make your home energy efcient, your home needs to breathe. Fresh air must enter your home. All fuelburning appliances need fresh air for proper combustion and ventilation.
Exhaust fans, replaces, clothes dryers, and fuel burning appliances draw air from the house to operate. You must provide
adequate fresh air for these appliances. This will insure proper venting of vented fuelburning appliances.
PROVIDING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas Code, NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion and
Ventilation. All spaces in homes fall into one of the three following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 9 and 10 will help you classify your space and provide adequate ventilation.
UNUSUALLY TIGHT CONSTRUCTION
The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in
buildings of unusually tight construction, you must provide additional fresh air. Unusually tight construction is dened as
construction where:
a. walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating
of one perm (6x10-11 kg per pa-sec-m2) or less with openings gasketed or sealed and
b. weather stripping 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.
If your home meets all of the three criteria above, you must provide additional fresh air. See “Ventilation Air From Outdoors,” page 10.
If your home does not meet all of the three criteria above, proceed to “Determining Fresh- Air Flow For Heater Location,”
page 9.
CONFINED AND UNCONFINED SPACE
The National Fuel Gas Code, ANSI Z223.1 denes a conned 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 and an unconned
space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m 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 unconned space. This heater shall not
be installed in a conned space or unusually tight construction unless provisions are provided for adequate combustion and
ventilation air.
* Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.
8 49D0090
FRESH AIR FOR COMBUSTION AND VENTILATION
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
DETERMINING IF YOU HAVE A CONFINED OR UNCONFINED SPACE
Use this worksheet to determine if you have a conned or unconned space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ____________________ cu. ft. (volume of space)
Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total
volume of the space.
2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_____________________(volume of space) ¸ 50 cu. ft. = (Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space)¸ 50 cu. ft. = 51.2 x 1000 = 51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater _______________ Btu/Hr
Gas water heater* _______________ Btu/Hr
Gas furnace _______________ Btu/Hr
Vented gas heater _______________ Btu/Hr
Gas replace logs _______________ Btu/Hr
Other gas appliances* + _______________ Btu/Hr
Total = _______________ Btu/Hr
Example:
Gas water heater 30,000 Btu/Hr
Vent-free heater + 30,000 Btu/Hr
Total = 60,000 Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to
the out-doors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
_________________ Btu/Hr (maximum the space can support)
_________________ Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space can support)
60,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the above example is a conned space because the actual Btu/Hr used is more than the maximum Btu/Hr the
space can support. You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconned space, remove
door to adjoining room or add ventilation grills between rooms. See “Ventilation Air From Outdoors,” page 10.
B. Vent room directly to the outdoors. See “Ventilation Air From Outdoors,” page 10.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconned.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconned space. You will
need no additional fresh air ventilation.
If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if 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/NFPA 54, Section 5.3 or applicable local codes.
WARNING
49D0090 9
49D0090 11
FRESH AIR FOR COMBUSTION AND VENTILATION
VENTILATION AIR
FROM INSIDE BUILDING
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor on the
wall connecting the two spaces (see options 1
and 2, Figure 6). You can also remove door
into adjoining room (see option 3, Figure 6).
Follow the National Fuel Gas Code, NFPA 54/
ANSI Z223.1, Section 5.3, Air for Combustion
and Ventilation for required size of ventilation
grills or ducts.
Option 1:
Ventilation
Grills into
Adjoining
Room
Option
3:
Remove
Door into
Adjoining
Room
Option 2:
Ventilation Grills into
Adjoining Rooms
Rework worksheet, adding
the space of the adjoining
unconfin ed spa ce. Th e
combine d spaces m ust
have enough fresh air to
supply all appliances in
WARNING
both spaces.
VENTILATION AIR FROM OUTDOORS
Provide extra fresh air by using ventilation
grills or ducts. You must provide two permanent openings: one within 12" of the ceiling
and one within 12" of the oor. Connect these
items directly to the outdoors or spaces open to
the outdoors. These spaces include attics and
crawl spaces. Follow the National Fuel Gas
Code, NFPA 54/ANSI Z223.1, Section 5.3, Air
for Combustion and Ventilation for required
size of ventilation grills or ducts.
IMPORTANT: Do not provide openings
for inlet or outlet air into attic if attic has a
thermostat-controlled power vent. Heated
air entering the attic will activate the power
vent.
Outlet
Air
Outlet
Air
Figure 6 - Ventilation Air from Inside Building
Outlet
Inlet Air
Figure 7 - Ventilation Air from Outdoors
Ventilated
Attic
Air
To Attic
To
Crawl
Space
Ventilated
Crawl Space
10 49D0090
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