Monessen Hearth NB18, NB24 Clearances and Height Requirements, Sidewall and Ceiling Clearances

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CLEARANCES AND HEIGHT REQUIREMENTS

WARNING

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. Failure to follow instructions exactly can create a ﬁre hazard.

Sidewall and ceiling clearances: The sides of the fireplace opening must be at least 16" from any combustible wall. The ceiling must be at least 42" from the top of the fireplace opening.

42"

16"

Figure 4 - Sidewall and Ceiling Clearances

81D0107

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Contents What to do if YOU Smell GAS Model NB18, NB24Read and Save These Instructions Contents Owner Important Safety InformationInstaller Massachussetts Residents only Make Sure YOU have Received ALL Parts What YOU will Need for InstallationGetting Started Product Features and Specifications Adequate Combustion and Ventilation AIR General Installation InformationCodes BTU / Hr = Model Fireplace and Hearth DimensionsHeight of Restriction Minimum Depth of Fireplace/Firebox Placement in a Fireplace with a Restrictive BarrierSidewall and Ceiling Clearances Clearances and Height RequirementsClearances and Height Requirements Measuring Heat Resistant Material for Mantel Minimum Mantel Clearance with No Hood -NB18 Mum of 10 at a minimum of 28 above the opening Minimum Clearance above Combustible Flooring Floor ClearanceDamper Stop Installation Installing Vented ApplicationsBefore Fully Installing the Unit Before Installing the AppliancePlacing and Securing Appliance Installing Vented ApplicationsAssembly Procedure Flexible Tube Manual Shutoff Gas Supply Inlet Valve Connecting the GASMillivolt Valve Control Figure Checking GAS PressureATE Electrical Wiring MillivoltConnecting Optional Wall Switch or Thermostat Complete Millivolt System Check Connecting Remote ReceiverChecking System Operation Placing Rock Wool LOG PlacementPlacing Log #3 Placing the Decorative Rock EMBER, GRATE, and Rock InstallationCast Iron Grate Installation Placing Flickering EmbersMillivolt Control and Thermostat Control Flame AppearanceChecking the Pilot Flame Operating Instructions Checking the Burner FlameWhat to do if YOU Smell GAS Operating InstructionsTo Turn OFF GAS to Heater Cleaning and Servicing Operating Instructions and Cleaning and ServicingObserved Problem Possible Cause Remedy TroubleshootingODS/pilot lights, but flame Burner Assembly Replacement PartsAccessories Sold Separately Replacement Parts ListDescription Qty BO18-R BO18-F BO24-R BO24-F BO30-R BO30-F Berkley OAK Refractory LogsCarbon Monoxide Detector Requirements Special Requirements 81D0107 81D0107 Basic Warranty Lifetime WarrantyFive Year Warranty