Monessen Hearth NB24, NB18 operating instructions Clearances and Height Requirements

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CLEARANCES and HEIGHT REQUIREMENTS

Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection:

To install the gas logs into a fireplace with no wooden mantel, shelf or other combustible projection above the fireplace opening, measure the heat resistant material height, per Figure 5, then see TABLE A.

Heat resistant materials such as slate and marble must be at least 1/2” thick. Sheet metal should not be installed onto combustible material.

IMPORTANT: If you cannot meet these minimum clearances you must operate the heater with chimney flue damper open. Refer to “Installing Vented Applications” found on page 18.

Heat

Resistant

Material

Measure

this

distance

Heater in

Fireplace or

Firebox

Figure 5 - Measuring Heat Resistant Material

HEAT RESISTANT

REQUIREMENTS FOR SAFE INSTALLATION

MATERIAL

 

 

NB18

NB24

MEASUREMENT

 

 

12" or more

Hood not required.

Hood not required.

8" to less than 12"

Hood not required.

Extend heat resistant material

 

 

to 12" OR install hood. See

 

 

Figure 5.

Less than 8"

Extend heat resistant material

Extend heat resistant material

 

and 8” AND install hood. See

to 8" AND install hood. See

 

Figure 5.

Figure 5. OR, extend heat

 

 

resistant material to a height of

 

 

at least 12".

TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection

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81D0107

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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 = 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 FlooringInstalling Vented Applications Before Fully Installing the UnitBefore Installing the Appliance Damper Stop InstallationInstalling Vented Applications Assembly ProcedurePlacing and Securing Appliance Connecting the GAS Flexible Tube Manual Shutoff Gas Supply Inlet ValveChecking GAS Pressure Millivolt Valve Control FigureElectrical Wiring Millivolt Connecting Optional Wall Switch or ThermostatATE Connecting Remote Receiver Checking System OperationComplete Millivolt System Check LOG Placement Placing Rock WoolPlacing Log #3 EMBER, GRATE, and Rock Installation Cast Iron Grate InstallationPlacing Flickering Embers Placing the Decorative RockFlame Appearance Checking the Pilot FlameMillivolt Control and Thermostat Control 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 Lifetime Warranty Five Year WarrantyBasic Warranty