UNVENTED GAS LOG HEATER or VENTED DECORATIVE APPLIANCE INSTALLATION AND OPERATING INSTRUCTIONS MODEL: NB18, NB24 Natural Gas or Liquid Propane Control Type: Millivolt WARNINGS This appliance may be installed in an aftermarket, permanently located, manufactured (mobile) home, where not prohibited by local codes. 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.
CONTENTS Getting Started.......................................................... 5 Electrical Wiring (Millivolt)..................................... 21 Connecting Remote Receiver ............................ 22 Checking System Operation .............................. 22 Product Features and Specifications .................... 6 Natural Gas ......................................................... 6 Propane/LPG ....................................................... 6 Ignition Controls ................
IMPORTANT SAFETY INFORMATION INSTALLER Please leave these instructions with the appliance. OWNER Please retain these instructions for future reference. WARNING 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.
IMPORTANT SAFETY INFORMATION Continued from page 3 25. Never burn solid fuels in a fireplace where a unvented room heater is installed. 17. Unvented gas heaters are a supplemental zone heater. They are not intended to be the primary heating appliance. 26. 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. 18.
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 Log Burner Assembly • Two (2) Plastic Bags Containing Crushed Volcanic Rock • Installation/Operating Instructions • Two (2) Anchoring Screws • Ceramic Fiber Logs / Refractory Logs • Rock wool • Grate Assembly • On/Off Log Switch Assembly CAUTION The following options may be used with the Millivolt controlled heater.
PRODUCT FEATURES AND SPECIFICATIONS NATURAL GAS NOTE: An external regulator is required to reduce supply pressure to a maximum of 10 1/2" W.C. on natural gas systems operating at higher pressure. Gas Rate MILLIVOLT Regulator Pressure Setting: 3.5" w.c. Pilot Regulator: 3.5" w.c. Gas Inlet Pressure: Max 101/2" w.c. Model Number Control Max BTU/Hr Min BTU/Hr NB18NV Millivolt 28,000 19,000 NB24NV Millivolt 37,000 25,000 Min. 5" w.c.
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.
GENERAL INSTALLATION INFORMATION Counter Fireplace H W Figure 1 - Example of a Large Room with 1/2 Wall Divider 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. BTU Hr 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.
WARNING FIREPLACE AND HEARTH DIMENSIONS This appliance is for installation only in a solid-fuel burning masonry or UL127 factorybuilt fireplace, vent free appliance, or in listed ventless firebox enclosure. It has been design certified for these installations. Exception: DO NOT install this appliance in a factory-built fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs.
PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER IMPORTANT INFORMATION FOR THE INSTALLATION OF THIS GAS LOG SET The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front opening of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.
WARNING CLEARANCES AND HEIGHT REQUIREMENTS The dimensions shown in Figures 4 through 12 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. When heater is installed into a ventless firebox, minimum clearances, as specified by the ventless firebox manufacturer, must be met. Follow these instructions carefully to ensure safe installation.
CLEARANCES and HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection: To install the gas logs into a fireplace with no wooden mantel, shelf or other combustible projection above the fireplace opening, measure the heat resistant material height, per Figure 5, then see TABLE A. Heat resistant materials such as slate and marble must be at least 1/2” thick. Sheet metal should not be installed onto combustible material.
CLEARANCES and HEIGHT REQUIREMENTS 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 6, then refer to Table B.
CLEARANCES AND HEIGHT REQUIREMENTS 10" 8" 6" 21/2" Heat Resistant Material 8" Heater in Fireplace or Firebox 14" 201/2" 245/8" 28" Example: A mantel may project from the wall a maximum of 21/2" at a minimum of 14" above the opening, and a maximum of 6" at a minimum of 201/2" above the opening.
CLEARANCES AND HEIGHT REQUIREMENTS 10" or less Heat Resistant Material 12" min. 28" Heater in Fireplace or Firebox Example: The bottom of the mantel may project from the wall a maximum of 10" at a minimum of 28" above the opening. Figure 9 - Minimum Mantel Clearance with No Hood — NB24 7" 6" Figure 10 is an example of an unsafe mantel installation.
FLOOR CLEARANCE The gas log heater must be installed at least 13/8" above any combustible flooring material, such as carpeting or tile, which is closer than 14" to the base of the fireplace. The minimum distance must be maintained from the top surface of carpeting, tile, etc. See Figure 11. OR The gas log heater may be installed nearer to the floor if a minimum of 14" of noncombustible material such as slate or marble is installed between the base of the fireplace and the combustible flooring.
FIREPLACE PREPARATION BEFORE FULLY INSTALLING THE UNIT: • Turn OFF the gas supply to the fireplace or firebox. WARNING • Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper.
INSTALLING VENTED APPLICATIONS WARNING PLACING AND SECURING APPLIANCE You must secure the gas log heater to the fireplace floor. If not, the entire unit may move when you adjust the controls. Movement of unit may cause shifting of the gas logs which leads to sooting and improper burning. Grate movement could cause a gas leak. Special care is required if you are installing the unit into a sunken fireplace. You must raise the fireplace floor to allow access to gas log controls.
CONNECTING THE GAS CAUTION NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local codes. Use new black iron or steel pipe. Internally tinned copper or copper tubing can be used per National Fuel Code, section 2.6.3, providing gas meets hydrogen sulfide limits, and where permitted by local codes. Gas piping system must be sized to provide minimum inlet pressure (Listed on Data Plate) at the maximum flow rate (BTU/Hr).
WARNING CHECKING GAS PRESSURE Connecting directly to an unregulated propane/LPG tank can cause an explosion. The heater gas inlet connection is a 3/8" NPT at the valve. On all control type units, the inlet connection is on the right side of unit. To connect from the opposite side, route the pipe around the back portion of the unit. When tightening up the joint to the valve, hold the valve securely to prevent movement.
ELECTRICAL WIRING (MILLIVOLT) CAUTION The Millivolt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
ELECTRICAL WIRING (MILLIVOLT) CONNECTING REMOTE RECEIVER 1. Set remote receiver. See instructions included in receiver kit. 2. Connect the two (2) 1/4" female connectors to the TP/TH and TH terminals on the control valve. NOTICE Remote Wire Connectors Do not let wires touch grate or burner. Remote Receiver Remote Wire Connectors Valve Figure 18 - Installing Remote Receiver Note: Heat reduces battery life.
LOG PLACEMENT WARNING Before you begin — This unit is supplied with seven (7) ceramic fiber logs. Do not handle these logs with your bare hands. Always wear gloves to prevent skin irritation from ceramic fibers. After handling the logs, wash your hands gently with soap and water to remove any traces of fibers. The positioning of the logs is critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance.
LOG PLACEMENT 4. Place left rear log (#4) on pin located on rear support bracket on left side. See Figure 23. 5. Place left front log (#5) on left pin located on burner and left grate bar. Rest top right portion of log on right front log. See Figure 24 6. Place log #6 on unit by placing grooved portion of log onto left grate bar with bark facing outward. Rest front part of log in groove on left front log. See Figure 25 7.
EMBER, GRATE, AND ROCK INSTALLATION PLACING FLICKERING EMBERS Place flickering bright embers (FBE-.1G) after placing logs on burner. Pull apart into small strands and place on top of existing rock wool in front of and between front logs where they can be seen. Try to avoid stacking these embers on top of each other. Use smaller, stringier strands for maximum effect. Use as much as needed until desired effect is achieved.
FLAME APPEARANCE Flames from the pilot and burner should be visually checked as soon as the heater is installed. In addition, periodically check the flames visually during operation. CHECKING THE PILOT FLAME The pilot flame must always be present when the heater is in operation. It should just touch the top of the thermocouple tip for natural. See Figure 30 for correct pilot flame. If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
CHECKING THE BURNER FLAME In normal operation at full rate after 15 minutes, the following flame appearances should be observed: Figure 32 - Correct Appearance of Rear Flames of Berkley Oak Burner will have a random pattern of yellow flames as shown in Figure 32. There should be glowing embers on the front burner. Note: The front flames and embers will be an opaque orange color during the burn off time. OPERATING INSTRUCTIONS Avoid any drafts that alter burner flame patterns.
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 a piezo ignition device which lights the pilot. If piezo is not working properly see Match Lighting Instructions, page 30. B. BEFORE OPERATING smell all around the appliance area for gas.
OPERATING INSTRUCTIONS Millivolt CONTROL 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 30. 4. Turn gas control knob clockwise to the OFF position and turn ON/OFF switch to OFF position. 5. Wait (5) minutes to clear out any gas.
OPERATING INSTRUCTIONS AND CLEANING AND SERVICING MATCH LIGHTING INSTRUCTIONS 1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo button, light a match and hold the flame to the end of the pilot and ignite the pilot. 3. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access. 4.
WARNING WARNING TROUBLESHOOTING Turn appliance OFF and allow to cool before servicing. Only a qualified service person should service and repair the heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignitor button is pressed, there is no spark at ODS/pilot. 1. Ignitor electrode positioned wrong. 1 Replace ignitor. 2. Ignitor electrode is broken. 2. Replace ignitor. 3. Ignitor electrode not connected to ignitor cable. 3.
WARNING TROUBLESHOOTING If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfire when lit. If the gas quality or pressure is low, contact your local gas supplier immediately. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY ODS/pilot lights, but flame 1. Control knob not fully pressed in. goes out when control knob 2. Control knob not pressed in long enough. is released. 1. Press in control knob fully. 2.
REPLACEMENT PARTS WARNING BURNER ASSEMBLY 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.
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
MASSACHUSETTS RESIDENTS ONLY: PLEASE READ AND FOLLOW THESE SPECIAL REQUIREMENTS NOTE REGARDING VENTED PRODUCTS This product must be installed by a licensed plumber or gas fitter when installed within the Commonwealth of Massachusetts. Any residence with a direct vent product must have a CO detector installed in the residence. Installation of the fireplace or vented gas log in the State of Massachusetts requires the damper to be permanently removed or welded in the fully open position.
SPECIAL REQUIREMENTS CONTINUED 2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified. 3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment.
NOTES 38 81D0107
NOTES 81D0107 39
MONESSEN HEARTH SYSTEMS LIMITED LIFETIME WARRANTY POLICY LIFETIME WARRANTY The following components are warranted for life to the original owner, subject of 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: Vent Free Ceramic Fiber Logs and Aluminized Burners.
