OWNER'S OPERATION AND INSTALLATION MANUAL VENT-FREE HEARTH HEATER BTU/Hr

ManualsBrandsMonessen Hearth ManualsWater HeaterBTU/Hr

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.

READ AND SAVE THESE INSTRUCTIONS

DHHP/NT

Natural Gas or Propane/LPG

15,000 to 30,000 Btu/Hr

with Thermostat

VENT-FREE HEARTH HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

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.

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.

Shown with Optional Mantel

Which Features a Built-In Base

Summary of content (32 pages)

PAGE 1
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 WARNINGS 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.
PAGE 2
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 ....................................................
PAGE 3
IMPORTANT SAFETY INFORMATION INSTALLER Please leave these instructions with the owner. OWNER Please retain these instructions for future reference. IMPORTANT WARNING 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.
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 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.
PAGE 5
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. Model Number DHHNT Control THERMOSTAT Gas Rate Max BTU/Hr Min BTU/Hr 30,000 15,000 PROPANE/LPG Note: An external regulator is required to reduce supply pressure to a maximum of 13" W.C.
PAGE 6
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. Hood PIEZO IGNITION SYSTEM This heater has a piezo ignitor. This system requires no matches, batteries, or other sources to light heater. Screen THERMOSTAT HEAT CONTROL This heater has a thermostat sensing bulb and a control valve.
PAGE 7
ASSEMBLY INSTALLING LOGS Back Log 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. Front Log 3. Gently slide log on log retaining pin on base assembly (see Figure 3). The log should fit firmly against bottom of log retaining pin. 4. Place front log in front of burner and behind burner shield. WARNING 5. Reattach screen. WARNING: Always have burner shield and screen in place before operating heater.
PAGE 8
WARNING 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. Today’s homes are built more energy efficient than ever. New materials, increased insulation, and new construction methods help reduce heat loss in homes.
PAGE 9
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 confined or unconfined 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.
PAGE 10
FRESH AIR FOR COMBUSTION AND VENTILATION VENTILATION AIR �� FROM INSIDE BUILDING WARNING 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). You can also remove door into adjoining room (see option 3, Figure 6). Follow the National Fuel Gas Code, NFPA 54/ ANSI Z223.
PAGE 11
CHECK GAS TYPE: 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. A qualified service person must install heater. Follow all local codes. CAUTION NOTICE 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.
PAGE 12
INSTALLATION WARNING LOCATING HEATER Maintain the minimum clearances shown in Figure 8. If you can, provide greater clearances from floor, ceiling, and joining wall. 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. See “Accessories,” pages 28 and 29.
PAGE 13
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 • in high traffic areas • in windy or drafty areas CAUTION WARNING INSTALLATION This heater creates warm air currents. These currents move heat to wall surfaces next to heater.
PAGE 14
INSTALLATION 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). Attach mounting bracket to wall studs. This method provides the strongest hold. Insert mounting screws through mounting bracket and into wall studs. Mounting Bracket WARNING 1.
PAGE 15
INSTALLATION Horizontal Slots Placing Heater on Mounting Bracket 1. Install wall spacers. 2. Attach two (2) rubber bumpers to back of heater as shown in Figure 10. Stand-Out Tabs Mounting Bracket (already attached to wall) 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 mounting bracket. B.
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. Bottom of Heater Shipping Screw 3. Line up mounting holes on top of hearth base with holes in bottom of heater (see Figure 11). 4. Using a Phillips screwdriver, secure hearth base to heater with four sheet metal screws (see Figure 11). 5. Stand heater up on base. 6.
PAGE 17
INSTALLATION WARNING This appliance requires a 3/8” NPT (National Pipe Thread) inlet connection to the pressure regulator. Never connect heater to private (nonutility) gas wells. This gas is commonly known as wellhead gas. CAUTION CAUTION 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
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa) 1. Disconnect appliance with its appliance main gas valve (control valve) and equipment shutoff valve from gas supply piping system. Pressures in excess of 1/2 psig will damage heater regulator. 2. Cap off open end of gas pipe where equipment shutoff valve was connected. 3. Pressurize supply piping system by either using compressed air or opening propane/LP supply tank valve.
PAGE 19
OPERATING INSTRUCTIONS WARNING 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. A. This appliance is equipped with an ignition device which automatically lights the pilot. If the piezo is not working properly, see “Match Lighting Instructions,” page 21. B. BEFORE OPERATING smell all around the appliance area for gas.
PAGE 20
OPERATING INSTRUCTIONS LIGHTING 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 “Match Lighting Instructions”, page 21. 4. Turn gas control knob clockwise to the OFF position. 5. Wait (5) minutes to clear out any gas. Then smell for gas, including near the floor.
PAGE 21
OPERATING INSTRUCTIONS TO TURN OFF GAS TO HEATER SHUTTING OFF HEATER 1. Turn control knob clockwise to OFF position to completely shut off the heater. 2. If applicable: Turn off all electric power to the heater. SHUTTING OFF BURNER ONLY (PILOT STAYS LIT) Turn control knob clockwise to the PILOT position. 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 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. When the thermocouple cools, the heater will shut down.
PAGE 23
turn off and unplug heater and let cool before servicing. Only a qualified service person should service and repair heater. CAUTION WARNING TROUBLESHOOTING Never use a wire, needle, or similar object to clean ODS/pilot. This can damage ODS/ pilot unit. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM When ignitor button is pressed, there is no spark at ODS/pilot POSSIBLE CAUSE REMEDY 1. Ignitor electrode positioned wrong 2. Ignitor electrode broken 3.
PAGE 24
TROUBLESHOOTING Continued OBSERVED PROBLEM Burner does not light after ODS/pilot is lit POSSIBLE CAUSE REMEDY 1. Burner orifice is clogged 1. Clean burner (see “Cleaning and Maintenance,” page 26) or replace burner orifice 2. Replace burner orifice 3. Contact local gas company 2. Burner orifice diameter is too small 3. Inlet gas pressure is too low Delayed ignition of burner 1. Manifold pressure is too low 2. Burner orifice is clogged 1. Contact local gas company 2.
PAGE 25
WARNING TROUBLESHOOTING 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 reach your gas supplier, call the fire department. IMPORTANT: Operating heater where impurities in air exist may create odors.
PAGE 26
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 ITEM DESCRIPTION 1 2 3 4 5 6 7 8 9 Burner Injector ODS Pilot Valve Tube, 3/16 ODS Pilot Assembly T-stat Control Valve Pressure Valve Regulator Piezo Wire Burner Valve Tube, 5/16 Piezo Ignitor 10 11 Front Log Rear Log QTY 1 1 1 1 1 1 1 1 1 DHHNT DHHPT 49D0200 49D0200 49D0080 49D0081 49D0050 49D0050 26D2529 14D0476 11V0701 11V0701 24D0305 24D0306 00K0632 00K0632 49D0071K 49D0071K 14D0503 14D0503 �� LOG SET 1 1 49D0053 49D0052 49D0053 49D0052 ��
PAGE 28
ACCESSORIES 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. Includes brass trim. Complete installation instructions included. Hearth Base HHB CORNER SURROUNDS WITH HEARTH CSHHF-O - Oak wood with honey oak finish CSHHF-DC - Birch wood with dark cherry finish Complete assembly instructions included.
PAGE 29
ACCESSORIES THERMOSTAT FORCED AIR BLOWER - BLOHH Provides better heat distribution. Makes heater more efficient. Compete installation and operating instructions included. 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 30 49D0090
PAGE 31
NOTES 49D0090 31
PAGE 32
MONESSEN HEARTH SYSTEMS LIMITED LIFETIME WARRANTY POLICY LIFETIME WARRANTY The following components are warranted for life to the original owner, subject to proof of purchase: Firebox, Combustion Chamber, Heat Exchanger, Grate and Stainless Steel Burners. FIVE YEAR WARRANTY The following components are warranted for 5 years to the original owner, subject of proof of purchase: Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners.