4 | Regency ® E21-10 Gas Fireplace Insert|4table of contentsBefore You Start .............................................................7Important Message ......................................................8General Safety Information ............................................8Policy for Solid Fuel Burning & Factory BuiltFireplaces ......................................................................9Factory-Built (Metal) Wood-Burning FireplaceRequirements ................................................................9Installation Checklist ....................................................10Minimum Fireplace Clearances ...................................10Clearances to Combustibles ........................................11Gas Connection ...........................................................12High Elevation..............................................................12Wiring Diagrams ..........................................................13Flue Connector Installation .........................................14Offset Flue Adaptor .....................................................14Venting.........................................................................15Combustion and Ventilation Air ....................................15Gas Pipe Pressure Testing ..........................................15DC Spark Igniter ..........................................................16Battery Installation .......................................................16Gas Insert Aeration system ........................................16Test for Flue Spillage ...................................................16Optional Brick Panel ....................................................16Log Set Installation ......................................................17Flush Glass installation...............................................21Safety screen installation / removal .............................21Conversion from NG to LP...........................................22Low profile faceplate installation ..................................23Optional backing plate installation ...............................25Wall Thermostat ..........................................................25Final Check..................................................................26Operating Instructions .................................................26First Fire ......................................................................26Automatic Convection Fan Operation ..........................26Normal Operating Sounds of Gas Appliances .............26Lighting Procedure ......................................................27Shutdown Procedure ...................................................27Copy Of Lighting Instruction Plate ...............................28Maintenance Instructions ............................................28Log Replacement ........................................................29Glass Gasket ...............................................................29Door Glass Replacement ............................................29Removing Valve Assembly ..........................................29Removing the Fan .......................................................29Main Assembly ............................................................30Burner Assembly & Log Set ........................................31Low profile faceplate assembly....................................31Warranty ......................................................................35