Desa GVB35N, GVB50N installation manual Service Procedures, Continued, Changing Burner Orifice

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SERVICE PROCEDURES

Continued

Changing Burner Orifice

1.Shut off gas supply to heater.

2.Remove lower front access panel on heater.

3.Disconnect burner tube from orifice holder (see Figure 24).

4.Remove orifice holder from burner (see Figure 24).

5.Use socket or open-end wrench to remove the old orifice from the orifice holder.

6.Clean and replace orifice, or replace with new orifice.

7.Turn on gas to heater and check for gas leaks. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once.

8.Replace lower front access panel.

Burner

Orifice

Burner

Tube

Orifice

Holder

Figure 24 - Orifice Location (35,000 BTU/Hr Burner Shown)

Figure 25 - Orifice

100353

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Contents OWNER’S OPERATION AND INSTALLATION MANUAL VENTED NATURAL GAS HEATERSModels GVB35N and GVB50N Save this manual for future referencePAGE CONTENTSSECTION SAFETY INFORMATIONWARNINGS DANGERContinued SAFETY INFORMATIONWARNINGS Continued PRODUCT IDENTIFICATION Figure 1 - Vented Natural Gas HeaterFigure 2 - Vented Natural Gas Heater, Rear View 100353FEATURES INSTALLINGLOCAL CODES UNPACKINGINSTALLING HEATER Never install the heaterFor convenience and efficiency, install heater If you install the heater in a home garageVENTING HEATER INSTALLING HEATERContinued INSTALLING HEATER ContinuedVENTING HEATER continued Figure 4 - Improper Venting SystemsINSTALLING HEATER ContinuedVENTING HEATER continued Proper Size Vent Vent TypesINSTALLING CONNECTING TO GAS SUPPLYHEATER ContinuedContinued INSTALLING HEATERFor purposes of input adjustment INSTALLING Pressure Testing Gas Supply Piping SystemPressure Testing Heater Gas Connections HEATERINSTALLING HEATER INSTALLING GLASS PANELFigure 9 - Removing Lower Front Access Panel ContinuedINSTALLING HEATERContinued 8.Repeat steps 4 through 7 for all glass panelsCarbon monoxide poisoning may lead to death FRESH AIR FOR COMBUSTION AND VENTILATIONDANGER COMBUSTION VENTILATIONFRESH AIR FOR ContinuedFRESH AIR FOR COMBUSTIONVENTILATION DANGERCOMBUSTION VENTILATIONFRESH AIR FOR ContinuedLIGHTING INSTRUCTIONS OPERATING HEATERFOR YOUR SAFETY READ BEFORE LIGHTING OPERATING HEATER ContinuedContinued Figure 17 - Viewing PilotMANUAL LIGHTING PROCEDURE OPERATING HEATERContinued TO TURN OFF GAS TO APPLIANCEINSPECTING PILOT AND BURNER FLAME PILOT FLAME PATTERNBURNER FLAME PATTERN ContinuedINSPECTING PILOT AND BURNER FLAME ContinuedCLEANING AND MAINTENANCE CABINETCOMBUSTION CHAMBER AND BURNER PILOTand Maintenance, page TROUBLESHOOTING Cleaning and Mainte ing and MaintenanceCleaning and Mainte TROUBLETROUBLE- SHOOTING ing and MaintenanceMaintenance, page Cleaninging and Maintenance TROUBLESHOOTING ContinuedSERVICE PROCEDURES Removing Control Valve and Burner TubeSERVICE PROCEDURES ContinuedRemoving Burner ContinuedChanging Burner Orifice SERVICE PROCEDURESContinued SPECIFICATIONS TECHNICAL SERVICESERVICE HINTS REPLACEMENT ORDERINGPARTS CENTRALSMANUAL SHUTOFF VALVE - GA5010 ACCESSORIESBLOWER KIT - PART NUMBER GA6010 PARTS LIST AssemblyILLUSTRATED BurnerPARTS LIST Burner Assembly PART NUMBER FORGVB50N GVB35NILLUSTRATED PARTS LIST Cabinet Assembly manualPage WARRANTY INFORMATION DESA