Monessen Hearth NB24, NB18 operating instructions Flame Appearance, Checking the Pilot Flame

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FLAME APPEARANCE

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.

CHECKING THE PILOT FLAME

The pilot ﬂame must always be present when the heater is in operation. It should just touch the top of the ther- mocouple tip for natural. See Figure 30 for correct pilot flame.

If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably. See Figure 31 for incor- rect shape of pilot flame.

MILLIVOLT CONTROL AND THERMOSTAT CONTROL

Thermocouple	Thermocouple
for Natural	for Natural

Thermocouple	Thermocouple
for LP	Thermocouple
	for LP
Figure 30 - Correct Appearance of Pilot Flame	Figure 31 - Incorrect Appearance of Pilot Flame

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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