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VENT-FREE HEARTH HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
Shown with Optional Mantel
Which Features a Built-In Base
Warning: 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 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.
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.
–
–
–
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
DHHP/NT
Natural Gas or Propane/LPG
15,000 to 30,000 Btu/Hr
with Thermostat
WARNINGS
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.
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Table of Contents
Related Manuals for Monessen Hearth BTU/Hr
Summary of Contents for Monessen Hearth BTU/Hr
- Page 1 READ AND SAVE THESE INSTRUCTIONS DHHP/NT Natural Gas or Propane/LPG 15,000 to 30,000 Btu/Hr with Thermostat 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.
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Page 2: Table Of Contents
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 ... -
Page 3: Important Safety Information
INSTALLER Please leave these instructions with the owner. 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. - Page 4 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 struc- ture.
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Page 5: Specifications
Model Number Control DHHNT THERMOSTAT Model Number Control DHHPT THERMOSTAT National Fire Protection Association, Inc. LOCAL CODES " W.C. on Gas Rate Max BTU/Hr Min BTU/Hr 30,000 15,000 Gas Rate Max BTU/Hr Min BTU/Hr 30,000 15,000 Batterymarch Park Quincy, MA 0226... -
Page 6: Product Identification
PRODUCT IDENTIFICATION 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. -
Page 7: Installing Logs
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 packag- ing. 3. Gently slide log on log retaining pin on base assembly (see Figure 3). -
Page 8: Fresh Air For Combustion And Ventilation
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 fuel- burning appliances in your home. -
Page 9: Determining Fresh-Air Flow For Heater Location
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined. If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation. -
Page 10: Ventilation Air
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 unconfined space, you must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 6). -
Page 11: Installation Items
This heater is intended for use as supplemental heat. Use this heater along with your primary heating system. Do not install this heater as your primary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. -
Page 12: Installation
INSTALLATION LOCATING HEATER You can locate heater on floor with optional heart base. The heater can also be installed into an optional decorative mantel (some mantels require the hearth base). IMPORTANT: Only use optional mantels and hearth base specified in this manual. Purchase the optional mantel and hearth base from your dealer. -
Page 13: Installation Options
Never install the heater • in a bedroom or a bathroom • in a recreational vehicle • where curtains, furniture, clothing, or other flammable objects are less than 36 inches from the front, top, or sides of the heater • as a fireplace insert •... - Page 14 Continued A. MOUNTING HEATER TO WALL Mounting Bracket The mounting bracket is located in the package tray (see Figure 9). Remove mounting bracket from tray. Only use last hole on each end of mounting bracket to attach bracket to wall. These two holes are 16 inches apart from their centers (see Figure 9).
- Page 15 INSTALLATION Placing Heater on Mounting Bracket 1. Install wall spacers. 2. Attach two (2) rubber bumpers to back of heater as shown in Figure 10. 3. Locate two (2) horizontal slots on back panel of heater. 4. Place heater onto mounting bracket. Slide horizontal slots onto stand-out tabs on mount- ing bracket.
- Page 16 INSTALLATION Continued Mounting Heater to Optional Hearth Base 1. Lay heater on its back on a table with the bottom of heater overhanging the edge of the table. 2. Remove 2 shipping screws in bottom of heater. Discard shipping screws. 3.
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Page 17: Connecting To Gas Supply
CONNECTING TO GAS SUPPLY This appliance requires a 3/8” NPT (National Pipe Thread) inlet connection to the pressure regulator. Never connect heater to private (non- utility) gas wells. This gas is commonly known as wellhead gas. The installer must supply an external regulator. The external regulator will reduce incoming gas pressure.You must reduce incoming gas pressure to between 11 and 14 inches of water column. -
Page 18: Checking Gas Connections
INSTALLATION CHECKING GAS CONNECTIONS Pressure Testing Gas Supply Piping System Test Pressures In Excess Of 1. Disconnect appliance with its appliance main gas valve (control valve) and equipment shutoff valve from gas supply piping system. Pressures in excess of damage heater regulator. 2. -
Page 19: Operating Instructions
FOR YOUR SAFETY READ BEFORE LIGHTING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. WHAT TO DO IF YOU SMELL GAS: • Do not attempt to light any appliance. •... -
Page 20: Lighting Instructions
OPERATING INSTRUCTIONS 1. STOP! Read the safety information label. 2. Make sure the manual shutoff valve is fully open. 3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo ignitor does not light the pilot, refer to instructions for 4. -
Page 21: To Turn Off Gas To Heater
TO TURN OFF GAS TO HEATER SHUTTING OFF HEATER 1. Turn control knob clockwise 2. If applicable: Turn off all electric power to the heater. SHUTTING OFF BURNER ONLY (PILOT STAYS LIT) Turn control knob clockwise THERMOSTAT CONTROL OPERATION The thermostatic control used on this heater differs from standard thermostats. Standard thermostats simply turn on and off the burner. -
Page 22: Inspecting Heater
INSPECTING HEATER Check pilot flame pattern and burner flame pattern often. PILOT FLAME PATTERN Figure 20 shows a correct pilot flame pattern. Figure 21 shows an incorrect pilot flame pattern. The incorrect pilot flame is not touching the thermocouple. This will cause the thermocouple to cool. -
Page 23: Troubleshooting
turn off and unplug heater and let cool before servicing. Only a qualified service person should service and repair heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE When ignitor button 1. Ignitor electrode positioned wrong is pressed, there is no 2. - Page 24 TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE Burner does not light 1. Burner orifice is clogged after ODS/pilot is lit 2. Burner orifice diameter is too small 3. Inlet gas pressure is too low Delayed ignition of 1. Manifold pressure is too low burner 2.
- Page 25 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.
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Page 26: Cleaning And Maintenance
CLEANING AND MAINTENANCE You must keep control areas, burner, and circulating air passageways of heater clean. Inspect these areas of heater before each use. Have heater inspected yearly by a qualified service person. Heater may need more frequent cleaning due to excessive lint from carpeting, pet hair, bedding material, etc. -
Page 27: Illustrated Parts List
ILLUSTRATED PARTS LIST �� �� � � � � � � � � � � � Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury. -
Page 28: Accessories
ACCESSORIES Hearth Base CORNER SURROUNDS WITH HEARTH CSHHF-O - Oak wood with honey oak finish CSHHF-DC - Birch wood with dark cherry finish Complete assembly instructions included. Brass Louvers LBHH BRASS LOUVERS - LBHH Polished brass louvers — two (2) top and three (3) bottom HEARTH BASE - HHB For locating heater on the floor. - Page 29 ACCESSORIES THERMOSTAT FORCED AIR BLOWER - BLOHH Provides better heat distribution. Makes heater more efficient. Compete installation and operating instructions included. 49D0090 WALL SURROUNDS WITH HEARTH WSHHF-O - Oak wood with honey oak finish WSHHF-DC - Birch wood with dark cherry finish Complete assembly instructions included.
- Page 30 NOTES 49D0090...
- Page 31 NOTES 49D0090...
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Page 32: Warranty
This warranty is expressly in lieu of other warranties, express or implied, including the warranty of mechantability of fitness for purpose and of all other obligations or liabilities. Monessen Hearth Systems, Inc. does not assume for it any other obligations or liability in connection with the sale or use of the appliance. In states that do not allow limitations on how long an implied warranty lasts, or do not allow exclusion of indirect damages, those limitations of exclusions may not apply to you.
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