4 | Horizon® HZ33CE-10 Gas Fireplace|4table of contentsSAFETY LABELCopy of Safety Decal .....................................................5REQUIREMENTSMA Code - CO Detector ................................................6DIMENSIONSUnit Dimensions ............................................................74 sided faceplate Dimensions ........................................7INSTALLATIONImportant Message ......................................................8Before You Start .............................................................8General Safety Information ............................................8Installation Checklist ......................................................9Locating Your Gas Fireplace ..........................................9Clearances ..................................................................10Mantel Leg Clearances................................................11Mantel Clearances.......................................................11Framing & Finishing .....................................................12Tile Finish ............................................................12Clean Finish .........................................................14Framing Dimensions ....................................................15Venting Introduction .....................................................16Exterior Vent Termination Requirements .....................17Regency® Direct Vent flex System ..............................18Rigid Pipe Venting Systems.........................................194" X 6-5/8" Rigid Pipe Cross Reference Chart ............20Rigid Pipe Venting Arrangements ...............................22Vertical Termination with Co-Linear Flex System ........23Venting Arrangements - Vertical Terminations ............24Unit installation with Horizontal termination .................29Unit installation with Vertical Termination.....................30Gas Line Installation ....................................................30Pilot Adjustment...........................................................31High Elevation..............................................................31885 S.I.T. Valve Description .........................................31Gas Pipe Pressure Testing ..........................................31Conversion from NG to LP...........................................32Wiring Diagram ............................................................33Aeration adjustment.....................................................33Optional Fan installation ..............................................34Wiring diagram with optional fan .................................37Optional Wall Thermostat Installation ..........................38Optional Reflective Panel Installation ..........................39Glass Crystals and optional stones .............................40Installation On Burner and Firebox Floor.....................40Optional Spa Stones Installation (around burner) .......40Optional log set Installation .........................................41Glass Door and Mesh barrier installation ....................43Standard Flush Door ...................................................43Mesh barrier ................................................................43Optional 4-sided faceplate installation .........................44OPERATING INSTRUCTIONSOperating Instructions .................................................45First Fire ......................................................................45Normal Operating Sounds of Gas Appliances .............45Lighting Procedure ......................................................46Shutdown Procedure ...................................................46Copy of Lighting Plate Instructions ..............................47MAINTENANCEMaintenance Instructions ............................................48General Vent Maintenance ..........................................48Glass Door...................................................................48Glass Replacement .....................................................48Valve Tray Replacement ..............................................49PARTS LISTMain Assembly ............................................................50Accessories .................................................................51WARRANTYThe Warranty: Limited Lifetime ...................................55