Monessen Hearth NB24 Installation And Operating Instructions Manual
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Monessen Hearth NB24 Installation And Operating Instructions Manual

Monessen Hearth NB24 Installation And Operating Instructions Manual

Vented/unvented gas log set
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Vented/Unvented Gas Log Set
Installation and Operating Instructions
Models: NB18, NB24, NB18SCR, NB24SCR
WARNING
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.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev E • 04/18
This appliance may be installed in
810107
NB18/24 cover
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.
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. Refer to page 4.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.

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  • Page 1 Vented/Unvented Gas Log Set Installation and Operating Instructions Models: NB18, NB24, NB18SCR, NB24SCR WARNING If the information in this manual is not followed exactly, a fire or explosion may result causing This appliance may be installed in 810107 property damage, personal injury or loss of life.

  • Page 2: Table Of Contents

    NB18/NB24 Gas Log Set CONTENTS Thank you and congratulations on your purchase of a Monessen log set IMPORTANT: Please read the installation and operation instructions and all warning before installing or using the appliance! Failure to follow these instructions may result in a possible fire hazard and will void the warranty.

  • Page 3: Important Safety Information

    NB18/NB24 Gas Log Set IMPORTANT SAFETY INFORMATION INSTALLER OWNER Please leave these instructions with the appliance. Please retain these instructions for future reference. IMPORTANT: Read these instructions carefully before installing or trying to operate this vent-free gas heater. WARNING: • Any change to this heater or its controls can be dangerous.

  • Page 4: Codes

    IMPORTANT SAFETY INFORMATION NB18/NB24 Gas Log Set MASSACHUSSETTS RESIDENTS ONLY: 18. Unvented gas heaters are a supplemental zone heater. They are not intended to be the primary heating appli- Refer to page 47 for additional information. ance. 19. Unvented gas heaters emit moisture into the living area.

  • Page 5: Product Features And Specifications

    NB18/NB24 Gas Log Set PRODUCT FEATURES CHECK PARTS: GAS PRESSURES Verify contents to ensure you have received all parts. You Natural Propane (LP) should have the following: Inlet Minimum 5.0" w.c. 11.0" w.c. NB Models Inlet Maximum 10.5" w.c. 13.0" w.c.

  • Page 6: Fireplace And Hearth Dimensions

    NB18/NB24 Gas Log Set FIREPLACE AND HEARTH DIMENSIONS PLACEMENT IN FIREPLACE WITH A WARNING RESTRICTIVE BARRIER This appliance is for installation only in a solid-fuel The following are guidelines for placing a gas log set in a burning masonry or UL127 factory-built fireplace,...

  • Page 7: Clearances And Height Requirements

    NB18/NB24 Gas Log Set CLEARANCES AND HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with WARNING no wooden mantel or other combustible projection: The dimensions shown in Figures 3 through 11 and To install the gas logs into a fireplace with no wooden...
  • Page 8 CLEARANCES AND HEIGHT REQUIREMENTS NB18/NB24 Gas Log Set 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 5, then refer to Table B.
  • Page 9 8" Hood Heater in Fireplace or Hood Firebox Figure 9 - Minimum Mantel Clearance with Hood — NB24 (Example of Unsafe Installation) FP2259 wrong mantel clearance Figure 9 is an example of an unsafe mantel installation. Figure 7 - This mantel projects 4" at 8" above the opening, exceeding Minimum Mantel Clearance with Hood —...

  • Page 10: Floor Clearance

    FLOOR CLEARANCE NB18/NB24 Gas Log Set The gas log heater must be installed at least 1 ⁄ " 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.

  • Page 11: Fireplace Preparation

    FIREPLACE PREPARATION NB18/NB24 Gas Log Set Before installing the appliance: WARNING • Turn off gas supply to fireplace or firebox. Before installing in a solid fuel burning fireplace, • The chimney flue and firebox must be cleaned of Have the fireplace floor and chimney professionally...

  • Page 12: Vented Application Installation

    VENTED APPLICATION INSTALLATION / SECURE APPLIANCE NB18/NB24 Gas Log Set WARNING WARNING You must secure the gas log heater to the fireplace The fireplace and gas logs function as a system. If floor. If not, the entire unit may move when you the fireplace is spilling into the room (check with adjust the controls.

  • Page 13: Gas And Valve Connection

    NB18/NB24 Gas Log Set GAS AND VALVE CONNECTION WARNING WARNING Connecting directly to an unregulated propane/ Use new black iron or steel pipe. Internally tinned LPG tank can cause an explosion. copper or copper tubing can be used per National Fuel Code, section 2.6.3, providing gas meets...

  • Page 14: Electrical Wiring - Millivolt

    ELECTRICAL WIRING - MILLIVOLT NB18/NB24 Gas Log Set ► CONNECT OPTIONAL WALL SWITCH Label all wires prior to disconnection when OR THERMOSTAT (VENT FREE servicing controls. Wiring errors can cause APPLICATIONS ONLY) improper and dangerous operation. Verify proper operation after servicing.

  • Page 15: Connect Remote Receiver

    ELECTRICAL WIRING - MILLIVOLT NB18/NB24 Gas Log Set CONNECT REMOTE RECEIVER A. Complete Millivolt System Check (“A” Reading - Thermostat contacts CLOSED - 1. Set remote receiver. See instructions included in Control Knob “ON” - Main burner should turn receiver kit.

  • Page 16: Grate And Log Installation

    2G-RW rock wool (for NB18), or CAST IRON GRATE INSTALLATION 3G-RW rock wool (for NB24) supplied with the unit. Install the cast iron grate by inserting screw head on back Failure to position the parts in accordance with of right side of grate into the “I”...

  • Page 17: Rock Wool Placement

    GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set ROCK WOOL PLACEMENT Right Front Log #2 Before installing logs, place rockwool in dime size pieces evenly over small burner ports starting in the rear of the burner going towards the front. Avoid placing rock wool on slots on each side of rear burner and on large yellow flame ports on front of burner.

  • Page 18: Place The Decorative Rock

    GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set 5. Place left front log (#5) on left pin located on burner and 8. Place right top log (#8) onto right rear (#3) and right left grate bar. Rest top right portion of log on right front front (#2) logs using locator on bottom of right top log.

  • Page 19: Highland Oak Log Placement

    GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set INSTALL 18", 24" AND 30" (F,R) HIGHLAND 4. Place left rear log (#4) on pin located on rear support bracket on left side and left grate bar. Figure 23 OAK LOGS ON NATURAL BLAZE BURNER 1.

  • Page 20: Stony Creek Log Placement

    GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set 6. Place top left log (#6) on left rear log (#4) and left front PLACE THE DECORATIVE ROCK log (#5) using locating grooves on bottom of #6 and locating blocks on logs #4 and #5. Figure 25 Optional volanic rock may be placed around the unit on the floor of the firebox.
  • Page 21 GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set 8. Place mid left log (#8) on mid rear log (#7) and front 4. Place front bottom right log (#4) on right pin located bottom log (#5) by placing notches on bottom of log on burner and right grate bar.

  • Page 22: Kentucky Wildwood Log Placement

    GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set 12. Place log #12 onto mid left log (#8) and mid rear log 2. Place bottom rear right log #2 on pin on rear of grate (#7) by placing notch on bottom of log onto locating assembly and push towards rear as far as possible.
  • Page 23 GRATE AND LOG INSTALLATION NB18/NB24 Gas Log Set 5. Place center left log #5 on top of log #4 on left side with small end of log #5 under log #3 and on left grate bar. Figure 40 Log #5 Figure 40 6.

  • Page 24: Beachcomber And Riverwood Log Placement

    NB18/NB24 Gas Log Set BEACHCOMBER AND RIVERWOOD LOGS 4. Place the right log (#4) on the bar located on the right INSTALL 18" BEACHCOMBER AND RIVERWOOD side of the burner. (See Figure 46.) LOGS ON NATURAL BLAZE BURNER 1. Place the rear log (#1) on the rear pins located on the log support bar.

  • Page 25: Flame Appearance

    FLAME APPEARANCE NB18/NB24 Gas Log Set 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. CHECK THE PILOT FLAME The pilot flame must always be present when the heater is in operation.

  • Page 26: Operating Instructions - Millivolt

    OPERATING INSTRUCTIONS — MILLIVOLT NB18/NB24 Gas Log Set FOR YOUR SAFETY READ BEFORE LIGHTING WARNING 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 27: Millivolt Control Lighting Instructions

    OPERATING INSTRUCTIONS — MILLIVOLT NB18/NB24 Gas Log Set 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 28: Match Lighting Instructions

    OPERATING INSTRUCTIONS — MILLIVOLT NB18/NB24 Gas Log Set 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.

  • Page 29: Check Gas Pressure

    ELECTRICAL INSTALLATION — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set CHECK GAS PRESSURE Pressure Inlet 1. Check gas type. The gas supply must be the same as stated on the appliance’s rating decal. If the gas supply is different from the fireplace, STOP! Do not install the appliance.

  • Page 30: Wiring Diagram - Signature Command System

    ELECTRICAL INSTALLATION — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set Thermocouple Thermocouple Module Pilot Orange RF Receiver ON/OFF Button Control Board Black / Thermopile Red / Thermopile Sensor Ignitor / Sparker Plug-in Connector Control Board to Command Center OFF/LO NOTE: Wall switch wires must...

  • Page 31: Operating Instructions - Signature Command System

    OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set FOR YOUR SAFETY READ BEFORE LIGHTING WARNING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

  • Page 32: Operating Instructions

    OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set OPERATING INSTRUCTIONS 1. STOP! Read the safety information above. 2. This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.

  • Page 33: Features

    OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set FEATURES Command Center To Thermopile Command Center RF Receiver • ON/OFF Easy access function operation and system configu- To Sensor ration To Sparker • Operation confirmation/fault diagnostic indications (LED/Buzzer) NG/LP •...

  • Page 34: Remote Transmitter Learn Function

    OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set Either mode benefits from the instantaneous battery back- REMOTE TRANSMITTER LEARN FUNCTION up, so you never have to worry about a power outage. (Default OFF unless packed with remote default will...

  • Page 35: Functions/Operations From The Command Center

    OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM NB18/NB24 Gas Log Set FUNCTIONS/OPERATION FROM THE COM- two presses will decrease the flame height to medium MAND CENTER and low. 3. The third press on OFF will turn off the main burner. In Turning on the fireplace standing pilot configuration, the pilot will stay;...

  • Page 36: Touch Screen Remote Control Operation

    TOUCH SCREEN REMOTE CONTROL OPERATION - SCR MODELS NB18/NB24 Gas Log Set WARNING Turn appliance OFF (at the master switch) if you are away from your house for an extended period of time. Never leave anything on top of the surface of the transmitter.

  • Page 37: Functions And Operations

    TOUCH SCREEN REMOTE CONTROL OPERATION — SCR MODELS NB18/NB24 Gas Log Set Setting Privacy Code on Transmitter Command Center Figure 56 The remote transmitter privacy code is preset in factory. In the event of activation or interference from other nearby transmissions, change the...
  • Page 38 TOUCH SCREEN REMOTE CONTROL OPERATION — SCR MODELS NB18/NB24 Gas Log Set 1. Press the ON/up button to turn on Thermostat Mode the fireplace. The flame icon on Figure 61 the LCD displays High. Press the THERMO button to set the 2.

  • Page 39: Safety Features

    TOUCH SCREEN REMOTE CONTROL OPERATION—SCR MODELS NB18/NB24 Gas Log Set 3. When Set Temp. is 1° F higher than Room Temp., n Safety Features flame height will be on Low. 1. Low Battery Detection 4. When Set Temp. is equal to Room Temp., flame height When low battery condition occurs, the trans- does not change (stays on low).

  • Page 40: Using The Mounting Base

    TOUCH SCREEN REMOTE CONTROL OPERATION—SCR MODELS NB18/NB24 Gas Log Set n Using the Mounting Base The transmitter comes with a mounting base which allows you to hang the transmitter on the wall. 1. Secure the mounting base on the wall with supplied screws.

  • Page 41: Cleaning & Servicing

    CLEANING AND SERVICING NB18/NB24 Gas Log Set CLEANING AND SERVICING ANNUAL CLEANING/INSPECTION - Refer to parts diagram for location of items discussed below. Annual inspection and cleaning by your dealer or qual- • ified service technician is recommended to prevent Inspect and clean burner air intake holes.

  • Page 42: Troubleshooting

    TROUBLESHOOTING NB18/NB24 Gas Log Set WARNING Turn appliance OFF and allow to cool before servicing. Only a qualified service person should service and repair the heater. MILLIVOLT CONTROL SYSTEM NOTE: All troubleshooting items are listed in order of operation. PROBLEM...

  • Page 43: Signature Command System

    TROUBLESHOOTING NB18/NB24 Gas Log Set WARNING 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.
  • Page 44 TROUBLESHOOTING NB18/NB24 Gas Log Set SIGNATURE COMMAND SYSTEM OPERATION FAULT ACTION DIAGNOSIS Make sure Command Install batteries and/or Using Battery polarity wrong? Re-install batteries Center and plug in the AC board battery? No beep in about the control 8 seconds...

  • Page 45: Replacement Parts

    REPLACEMENT PARTS NB18/NB24 Gas Log Set BURNER ASSEMBLY, MILLIVOLT MODELS 810108 NB parts NB18MV NB24MV REF. DESCRIPTION NATURAL PROPANE NATURAL PROPANE Piezo Ignitor 14D0503 014D0503 14D0503 14D0503 Piezo Wire 00K0632 00K0632 00K0632 00K0632 Burner 81D2004 81D2010 81D0515 81D0504 Control Valve...

  • Page 46: Burner Assembly - Signature Command System

    REPLACEMENT PARTS NB18/NB24 Gas Log Set BURNER ASSEMBLY, SIGNATURE COMMAND MODELS (NBSC, NBSCR) NB18SC NB18SCR NB24SC NB24SCR REF. DESCRIPTION QTY NATURAL PROPANE NATURAL PROPANE NATURAL PROPANE NATURAL PROPANE 810108 Burner 20303243 20303247 20303243 20303247 20303180 20303187 20303180 20303187 NBSC parts...

  • Page 47: Berkeley Oak Refractory Logs

    REPLACEMENT PARTS NB18/NB24 Gas Log Set BERKELEY OAK REFRACTORY LOGS BENEATH #8 810107 NB18 24 log parts REF. DESCRIPTION BO18-R BO18-F BO24-R BO24-F BO30-R BO30-F Ember Chunk 81D0110 81D0109 81D0110 81D0109 81D0110 81D0109 Right Front Log 81D0059 81D0083 81D0067 81D0091...

  • Page 48: Highland Oak Refractory Log

    REPLACEMENT PARTS NB18/NB24 Gas Log Set HIGHLAND OAK REFRACTORY LOGS (BENEATH #7) Item Description Qty. HO18-R HO18-F HO24-R HO24-F HO30-R HO30-F Ember Chunk 81D0110 81D0109 81D0110 81D0109 81D0110 81D0109 Right Front Log 81D0011 81D0035 81D0019 81D0043 81D0027 81D0051 Right Rear Log...

  • Page 49: Stony Creek Refractory Logs

    REPLACEMENT PARTS NB18/NB24 Gas Log Set STONY CREEK REFRACTORY LOGS 2 (Ember Chunk) 3 (Ember Chunk) REF. DESCRIPTION SC18-R SC24-R SC30-R Bottom Rear Log #1 20303558 20303570 20303570 810107 Ember Chunk #2 (notch on both ends) 81D0110 81D0110 81D0110 Mon SC24R log parts...

  • Page 50: Kentucky Wildwood Logs

    REPLACEMENT PARTS NB18/NB24 Gas Log Set KENTUCKY WILDWOOD REFRACTORY LOGS REF DESCRIPTION QUANTITY KW18-4 KW24-R KW30-R Bottom front right log, #1 20305902 20305813 20305909 Bottom rear right log, #2 20305903 20305814 20305910 Bottom rear left log, #3 20305904 20305815 20305911...

  • Page 51: Beachcomber And Riverwood Refractory Log

    NB18/NB24 Gas Log Set BEACHCOMBER AND RIVERWOOD LOGS Ref Description Qty BC18-R BC24-R BC30-R RW18-R RW24-R RW30-R Rear log, #1 20308895 20308748 20308917 20308931 20308754 20308901 Front left log, #2 20308897 20308750 20308750 20308933 20308756 20308756 Front center log, #3...

  • Page 52: Massachusetts Residents Only

    MASSACHUSETTS RESIDENTS ONLY NB18/NB24 Gas Log Set Please read and follow these special requirements NOTE REGARDING VENTED PRODUCTS 2. Approved Carbon Monoxide Detectors. Each carbon This product must be installed by a licensed plumber or monoxide detector as required in accordance with the above...

  • Page 54: Warranty

    LIMITED LIFETIME WARRANTY POLICY NB18/NB24 Gas Log Set 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.

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