Monessen Hearth NB18, NB24 operating instructions Mum of 10 at a minimum of 28 above the opening

Page 15

CLEARANCES AND HEIGHT REQUIREMENTS

10" or less

Heat

Resistant

Material

12" min. 28"

Heater in
Fireplace or	Example: The bottom of the mantel may project from the wall a maxi-
Firebox
	mum of 10" at a minimum of 28" above the opening.

Figure 9 - Minimum Mantel Clearance with No Hood — NB24

7"
6"
21/2"	141/2"
4"	8"
	8"

Figure 10 is an example of an unsafe mantel installation. This mantel projects 4" at 8" above the opening, exceeding the maximum acceptable distance of 21/2" The mantel also proj- ects 7" at 141/2" above the opening, exceeding the maximum acceptable distance of 6".

If your mantel profile is unsafe, you may either:

•Raise the mantel to an acceptable height

OR

•Remove the mantel

Figure 10 - Minimum Mantel Clearance with Hood - NB24

(Example of Unsafe Installation)

81D0107

15

Image 15

Contents Model NB18, NB24 Read and Save These InstructionsWhat to do if YOU Smell GAS Contents Important Safety Information InstallerOwner Massachussetts Residents only What YOU will Need for Installation Getting StartedMake Sure YOU have Received ALL Parts Product Features and Specifications General Installation Information CodesAdequate Combustion and Ventilation AIR 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 ApplianceInstalling Vented Applications Assembly ProcedurePlacing and Securing Appliance Flexible Tube Manual Shutoff Gas Supply Inlet Valve Connecting the GASMillivolt Valve Control Figure Checking GAS PressureElectrical Wiring Millivolt Connecting Optional Wall Switch or ThermostatATE Connecting Remote Receiver Checking System OperationComplete Millivolt System Check Placing Rock Wool LOG PlacementPlacing Log #3 Placing the Decorative Rock EMBER, GRATE, and Rock InstallationCast Iron Grate Installation Placing Flickering EmbersFlame Appearance Checking the Pilot FlameMillivolt Control and Thermostat Control 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 Lifetime Warranty Five Year WarrantyBasic Warranty