Monessen Hearth NB24 operating instructions Minimum Mantel Clearance with No Hood -NB18

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CLEARANCES AND HEIGHT REQUIREMENTS

10"

8"

6"

21/2"

Heat

Resistant

Material

8" 14" 201/2" 245/8" 28"

Heater in
Fireplace or	Example: A mantel may project from the wall a maximum of 21/2" at a mini-
Firebox
	mum of 14" above the opening, and a maximum of 6" at a minimum
	of 201/2" above the opening.

Figure 7 - Minimum Mantel Clearance with No Hood -NB18

	12"
	10"
	8"
	6"
Heat	21/2"
Resistant
Material
	8"	141/2" 185/8" 221/2" 26"
	Hood
	Heater in
	Fireplace or
	Firebox	Example:	A mantel may project from the wall a maximum of 21/2" at a
			minimum of 8" above the opening, and a maximum of 6" at a mini-
			mum of 141/2" above the opening.
	Figure 8 - Minimum Mantel Clearance with Hood - All Models

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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 = Fireplace and Hearth Dimensions ModelPlacement in a Fireplace with a Restrictive Barrier Height of Restriction Minimum Depth of Fireplace/FireboxClearances and Height Requirements Sidewall and Ceiling ClearancesClearances 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 Floor Clearance Minimum Clearance above Combustible FlooringBefore Installing the Appliance Installing Vented ApplicationsBefore Fully Installing the Unit Damper Stop InstallationPlacing and Securing Appliance Installing Vented ApplicationsAssembly Procedure Connecting the GAS Flexible Tube Manual Shutoff Gas Supply Inlet ValveChecking GAS Pressure Millivolt Valve Control FigureATE Electrical Wiring MillivoltConnecting Optional Wall Switch or Thermostat Complete Millivolt System Check Connecting Remote ReceiverChecking System Operation LOG Placement Placing Rock WoolPlacing Log #3 Placing Flickering Embers EMBER, GRATE, and Rock InstallationCast Iron Grate Installation Placing the Decorative RockMillivolt Control and Thermostat Control Flame AppearanceChecking the Pilot Flame Checking the Burner Flame Operating InstructionsOperating Instructions What to do if YOU Smell GASTo Turn OFF GAS to Heater Operating Instructions and Cleaning and Servicing Cleaning and ServicingTroubleshooting Observed Problem Possible Cause RemedyODS/pilot lights, but flame Replacement Parts Burner AssemblyReplacement Parts List Accessories Sold SeparatelyBerkley OAK Refractory Logs Description Qty BO18-R BO18-F BO24-R BO24-F BO30-R BO30-FCarbon Monoxide Detector Requirements Special Requirements 81D0107 81D0107 Basic Warranty Lifetime WarrantyFive Year Warranty