Desa CDR3924NT installation manual What to do if YOU Smell GAS

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UNVENTED (VENT-FREE) GAS LOG HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

24" THERMOSTAT MODELS CDR3924NT AND CDR3924PT

WARNING: If the information in this manual is not fol- lowed exactly, a ﬁre or explosion may result causing property damage, personal injury or loss of life.

—Do not store or use gasoline or other ﬂammable vapors and liquids in the vicinity of this or any other appliance.

—WHAT TO DO IF YOU SMELL GAS

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediatelycallyourgassupplierfromaneighbor’s phone. Follow the gas supplier’s instructions.

•If you cannot reach your gas supplier, call the ﬁre department.

—Installation and service must be performed by a quali- ﬁed installer, service agency or the gas supplier.

Save this manual for future reference.

For more information, visit www.desatech.com

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Contents Thermostat Models CDR3924NT and CDR3924PT What to do if YOU Smell GASTable of Contents Safety Information Local Codes Product Identification Product FeaturesDetermining FRESH-AIR Flow for Heater Location AIR for Combustion VentilationUnusually Tight Construction Conﬁned and Unconﬁned SpaceVentilation Air From Inside Building Ventilation AIRVentilation Air From Outdoors Check GAS Type InstallationLog Installation and Clearances for VENT-FREE OperationRear WidthMantel Clearances Determining Minimum Mantel Clearance When Using a HoodFloor Clearances Determining Minimum Mantel ClearanceInstallation Items Needed Installing Heater Base AssemblyExternal Regulator With Vent Pointing Down Connecting to GAS SupplyPropane/LP From Checking GAS ConnectionsNatural From Gas Test Pressures In Excess Of 1/2 Psig 3.5 kPaTest Pressures Equal To or Less Than 1/2 Psig 3.5 kPa Installing LogsAdding Lava Rock Attaching Grate to Base AssemblyOperating Heater For Your Safety Read Before LightingLighting Instructions To Turn OFF GAS To Appliance Manual Lighting ProcedureThermostat Control Operation Inspecting Burners Technical ServicePilot Flame Pattern Burner Flame PatternsBurner Injector Holders and Pilot AIR Inlet Holes Cleaning MaintenanceLogs Observed Problem Possible Cause Remedy TroubleshootingMaintenance, Cold Minute Air in gas line Operate burners until air is Gas leak. See Warning For Masonry and FACTORY- Built Metal Fireplace Optional Positioning Thermostat Sensing BulbReplacement Parts SpecificationsService Hints AccessoriesModels CDR3924PT and CDR3924NT Illustrated Parts BreakdownParts List Keep this Warranty Warranty InformationLimited Warranty Comfort Glow VENT-FREE GAS LOG Heaters