Monessen Hearth NB18 Installation And Operating Instructions Manual
Unvented gas log heater or vented decorative appliance
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Table of Contents
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Unvented Gas Log Heater
or
Vented Decorative
Appliance
Models: NB18, NB24, NB18SC,
NB24SC, NB18SCR, NB24SCR
Installation and Operating
Instructions
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.
810107
NB18/24 cover
This appliance may be installed in an
a f t e r m a r k e t , p e r m a n e n t l y l o c a t e d ,
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 refer-
ence.
81D0107 12/11 Rev. 9
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Table of Contents
Related Manuals for Monessen Hearth NB18
Summary of Contents for Monessen Hearth NB18
- Page 1 Unvented Gas Log Heater Vented Decorative Appliance Models: NB18, NB24, NB18SC, NB24SC, NB18SCR, NB24SCR Installation and Operating Instructions WARNINGS 810107 NB18/24 cover 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
NB18/NB24 Gas Log Set CONTENTS Thank you and congratulations on your purchase of a Monessen Log Set Please read the Installation and Operation Instructions before using the appliance! IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instructions may result in a possible fire hazard and will void the warranty. -
Page 3: Important Safety Information
IMPORTANT SAFETY INFORMATION NB18/NB24 Gas Log Set OWNER INSTALLER Please retain these instructions for future reference. Please leave these instructions with the appliance. 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. -
Page 4: Codes
IMPORTANT SAFETY INFORMATION NB18/NB24 Gas Log Set 18. Unvented gas heaters are a supplemental zone heater. MASSAChuSSettS reSIDeNtS oNly: They are not intended to be the primary heating appli- refer to Page 46 for ance. additional information. 19. Unvented gas heaters emit moisture into the living area. -
Page 5: Product Features And Specifications
PRODUCT FEATURES NB18/NB24 Gas Log Set MAkE SURE YOU HAVE RECEIVED ALL GAS PRESSURES PARTS: Natural Propane (LP) Check your packing list to verify that all listed parts have Inlet Minimum 5.0” w.c. 11.0” w.c. been received. You should have the following: Inlet Maximum 10.5”... -
Page 6: Fireplace And Hearth Dimensions
NB18/NB24 Gas Log Set FIREPLACE AND HEARTH DIMENSIONS IMPORTANT INFORMATION FOR THE This appliance is for installation only in a INSTALLATION OF THIS GAS LOG SET solid-fuel burning masonry or UL127 factory- built fireplace, vent free appliance, or in PLACEMENT IN FIREPLACE WITH A listed ventless firebox enclosure. -
Page 7: Clearances And Height Requirements
CLEARANCES HEIGHT REQUIREMENTS NB18/NB24 Gas Log Set The dimensions shown in Figures 3 through 11 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. - 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 resis- 8” or More tant material shown in Figure 5, then refer to Table B.
- Page 9 CLEARANCES HEIGHT REQUIREMENTS NB18/NB24 Gas Log Set 10" or less 10" 8" 6" 2 " Heat Heat Resistant 28" Resistant Material Material 12" min. 8" 14" 20 " 24 " 28" Figure 8 - Minimum Mantel Heater in Clearance with No Heater in Fireplace or Fireplace or Hood —...
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Page 10: Floor Clearance
NB18/NB24 Gas Log Set FLOOR CLEARANCE The gas log heater must be installed at least 1C\," 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 in a solid fuel burning fireplace, The chimney flue and firebox must be cleaned of soot, creosote, ashes and loose paint by a qualified chimney cleaner. This appliance is for installation only in a solid fuel burning fireplace (masonry fireplace or manufactured fireplace) with a working flue and constructed of noncombustible material. -
Page 12: Vented Application Installation
VENTED APPLICATION INSTALLATION / SECURE APPLIANCE NB18/NB24 Gas Log Set You must secure the gas log heater to VENTED APPLICATIONS ONLY the fireplace floor. If not, the entire unit may move when you adjust the controls. The fireplace and gas logs function as a Movement of unit may cause shifting of system. -
Page 13: Gas Line Connection
GAS LINE CONNECTION NB18/NB24 Gas Log Set 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). -
Page 14: Electrical Wiring - Millivolt
ELECTRICAL WIRING - MILLIVOLT NB18/NB24 Gas Log Set Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. The millivolt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE. -
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 receiver kit. - Control knob “ON” - Main burner should turn 2. -
Page 16: Final Installation
Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. Only use the logs and 2G-RW rock wool (for NB18), or 3G-RW rock wool (for NB24) supplied with the unit. -
Page 17: Rock Wool Placement
LOG PLACEMENT NB18/NB24 Gas Log Set ROCk WOOL PLACEMENT Before installing logs, place rockwool in dime size pieces • Use only rock wool provided with log evenly over small burner ports starting in the rear of the set. burner going towards the front. Avoid placing rock wool on •... -
Page 18: Log Placement
LOG PLACEMENT NB18/NB24 Gas Log Set Right Rear Log #3 4. Place left rear log (#4) on pin located on rear support bracket on left side. Figure 23 Left Rear Log #4 LG631 Figure 22 - Place Right Rear Log #3 LG631 5. -
Page 19: Ember And Rock Placement
LOG PLACEMENT NB18/NB24 Gas Log Set Middle Left Log #6 6. Place top left log (#6) on unit by placing grooved portion of log onto left grate bar with bark facing out- ward. Rest front part of log in groove on left front log. -
Page 20: Stoney Creek Log Placement
LOG PLACEMENT NB18/NB24 Gas Log Set PLACE STONEY CREEk SC18/24/30-R LOGS 1. Place bottom log (#1) on two (2) pins on rear of grate assembly and push towards rear as far as possible. Figure 28 Bottom Rear Log #1 Figure 28 LG1065 2. - Page 21 LOG PLACEMENT NB18/NB24 Gas Log Set 5. Place front bottom left log (#5) on Mid Right Log #6 left pin located on burner and left grate bar. The right side of the log should rest on log #4. Figure 31...
- Page 22 LOG PLACEMENT NB18/NB24 Gas Log Set 10. Place top front right log (#10) onto Top Front Right Top Front Left Log Log #10 mid right log (#6) by placing notch on bottom of log onto locating block on log #6. Rest bottom end of log onto grate bar.
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Page 23: 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 24: For Your Safety Read Before Lighting
NB18/NB24 Gas Log Set OPERATING INSTRUCTIONS - MILLIVOLT 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 26. -
Page 25: 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 26. -
Page 26: 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 27: Check Gas Pressure & Electrical Installation - Scs
CHECk GAS PRESSURE & ELECTRICAL INSTALLATION - SIGNATURE COMMAND NB18/NB24 Gas Log Set 1. Check gas type. The gas supply must be the same as Pressure Inlet stated on the appliance’s rating decal. If the gas supply is different from the fireplace, STOP! Do not install the appliance. -
Page 28: Wiring Diagram - Scs
ELECTRICAL INSTALLATION - SIGNATURE COMMAND 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 29: Operating Instructions - Signature Command
OPERATING INSTRUCTIONS - SIGNATURE COMMAND NB18/NB24 Gas Log Set 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. Refer to the instructions. -
Page 30: Operating Instructions
OPERATING INSTRUCTIONS - SIGNATURE COMMAND 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 31: Signature Command System Operation Instructions
SIGNATURE COMMAND SYSTEM OPERATION INSTRUCTIONS NB18/NB24 Gas Log Set FEATURES To Thermopile RF Receiver Command Center ON/OFF To Sensor • Easy Access Function Operation and System Configura- To Sparker tion • Operation Confirmation/Fault Diagnostic Indications NG/LP Conversion (LED/Buzzer) • ON/OFF/HI/Med/Low Operation •... - Page 32 NB18/NB24 Gas Log Set SIGNATURE COMMAND SYSTEM OPERATION INSTRUCTIONS SYSTEM CONFIGURATION/SETUP All System configuration/setup is done on the Command Center. NOTE: When using On/Off wall switch, the switch must be in the ON position to perform all configuration set ups at the command center.
- Page 33 SIGNATURE COMMAND SYSTEM OPERATION INSTRUCTIONS NB18/NB24 Gas Log Set FUNCTIONS/OPERATION (from the Command Center) Turning on the fireplace 1. Turn on the master switch and wait for a beep. 2. Press the ON button on the Command Center or turn on wall switch. Pilot will light and burner will come on High set- ting or last memory setting (See Turning Off Fireplace below).
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Page 34: Touch Screen Remote Control Operation
TOUCH SCREEN REMOTE CONTROL OPERATION - SCR MODELS NB18/NB24 Gas Log Set Due to the sensitive temperature monitoring components in the transmitter, it is necessary to allow the transmitter to stabilize to room tem- perature before accurate room temperatures are displayed. If the transmitter is activated... - Page 35 TOUCH SCREEN REMOTE CONTROL OPERATION - SCR MODELS NB18/NB24 Gas Log Set Setting Privacy Code on Transmitter Figure 45 Command The remote transmitter privacy Center code is preset in factory. In the event of activation or interfer- ence from other nearby trans-...
- Page 36 TOUCH SCREEN REMOTE CONTROL OPERATION - SCR MODELS NB18/NB24 Gas Log Set 1. Press the ON/up button to turn b. Use the OFF/down buttons to decrease the Set on the fireplace. The flame icon Time to zero Or on the LCD displays High.
- Page 37 TOUCH SCREEN REMOTE CONTROL OPERATION - SCR MODELS NB18/NB24 Gas Log Set 2. When the current setting is B), pressing TIMER button There is no manual flame height adjustment. and THERMO button at the same time for 3 seconds NOTE: there will a 10 second delay for the flame adjust- will switch to A) Mode.
- Page 38 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.
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Page 39: Cleaning & Servicing
CLEANING AND SERVICING NB18/NB24 Gas Log Set CLEANING AND SERVICING Annual inspection and cleaning by your dealer or qualified service technician is recommended to prevent malfunction and/or sooting. Turn off heater and allow to cool before cleaning. Disconnect electrical power before cleaning or servicing. -
Page 40: Troubleshooting
TROUBLESHOOTING NB18/NB24 Gas Log Set 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. Solution Problem Possible Cause 1. Replace ignitor. - Page 41 TROUBLESHOOTING NB18/NB24 Gas Log Set 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.
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Page 42: Signature Command System
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 43: Replacement Parts
REPLACEMENT PARTS NB18/NB24 Gas Log Set BURNER ASSEMBLY NB Millivolt Models BURNER ASSEMBLY 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 810108 NB... -
Page 44: Burner Assembly - Scs
REPLACEMENT PARTS NB18/NB24 Gas Log Set NB Signature Command Models (NBSC, NBSCR) BURNER ASSEMBLY NB18SC NB18SCR NB24SC NB24SCR Ref. Description Qty. Nat. Nat. Nat. 810108 1. Burner 20303243 20303247 20303243 20303247 20303180 20303187 20303180 20303187 NBSC parts 2. Control Valve 20303257 20303258 20303257 20303258 20303257 20303258 20303257 20303258 3. -
Page 45: Berkeley Oak Refractory Logs
REPLACEMENT PARTS NB18/NB24 Gas Log Set (BENEATH #8) BERkELEY OAk REFRACTORY LOGS 810107 NB18 24 log parts Ref. Description Qty. 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... -
Page 46: Stoney Creek Refractory Logs
REPLACEMENT PARTS NB18/NB24 Gas Log Set 2 (Ember Chunk) 3 (Ember Chunk) STONEY CREEk REFRACTORY LOGS Ref. Description Qty. SC18-R SC24-R SC30-R 810107 Bottom Rear Log #1 20303558 20303570 20303570 Mon SC24R log parts Ember Chunk #2 (notch on both ends) - Page 47 NB18/NB24 Gas Log Set 81D0107...
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Page 50: Massachusetts Residents Only
NB18/NB24 Gas Log Set Massachusetts Residents Only — Please read and follow these special requirements 2. Approved Carbon Monoxide Detectors. Each carbon NOTE REGARDING VENTED PRODUCTS monoxide detector as required in accordance with the above This product must be installed by a licensed plumber or gas fitter provisions shall comply with NFPA 720 and be ANSI/UL 2034 when installed within the Commonwealth of Massachusetts. -
Page 51: 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. - Page 52 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com...