Desa VN2550ITA, VN1800ITA, VN1800D, VN3000D installation manual Connecting to GAS Supply

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CONNECTING TO GAS SUPPLY

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NOTICE

A qualified service person must connect heater to gas supply. Follow all local codes.

WARNING

Never connect heater to private (non-utility) gas wells. This gas is commonly known as well-head gas.

IMPORTANT: Check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water. If gas line pressure is higher, heater regulator damage could occur.

CAUTION

Use only new, black iron or steel pipe. Internally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of large enough diameter to allow proper gas volume to heater. If pipe is too small, undue loss of pressure will occur.

Typical Pipe Diameters

VN1800D or VN1800ITA 3/8" or greater

VN3000D or VN2550ITA 1/2" or greater

Installation must include a manual shutoff valve, union, and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 13, page 15).

Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.

CAUTION

Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

Install sediment trap in supply line as shown in Figure 13, page 15. Locate sediment trap where it is within reach for cleaning. Locate sediment trap where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them from going into heater controls. If sediment trap is not installed or is installed wrong, heater may not run properly.

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Contents OWNER’S Operation and Installation Manual What to do if YOU Smell GASContents Safety Information Combustion and Ventilation, pages 5 through Identification Local Codes Unpacking Product FeaturesProduct Ventilation Fresh AIR ForCombustion Producing Adequate VentilationDetermining if You Have a Confined or Unconfined Space Fresh AIR for Combustion and VentilationDetermining FRESH-AIR Flow for Heater Location Ventilation AIR Ventilation Air From Inside BuildingVentilation Air From Outdoors Ventilation Air from OutdoorsCheck GAS Type Installing To WallInstallation Items Locating HeaterLocating Thermostat Sensing Bulb Thermostat Sensing BulbModels VN1800ITA and VN2550ITA Only Attaching Thermostat Sensing BulbRemoving Front Panel Of Heater Installing Heater to WallMounting Bracket Methods For Attaching Mounting Bracket To WallMarking Screw Locations Attaching Mounting Bracket To WallInstalling Bottom Mounting Screws Placing Heater On Mounting BracketConnecting to GAS Supply Connections Pressure Testing GAS Supply Piping SystemChecking GAS Servicing. Correct all leaks at oncePressure Testing Heater GAS Connections Checking GAS ConnectionsOperating Heater Operating Heater Lighting InstructionsHeater To Select Heating LevelShutting Off Heater Shutting Off Burner Only pilot stays litIf you do not follow these instructions exactly, a fire or Explosion may result causing property damage, personalOperating Injury or loss of lifeModels VN1800D and VN3000D LOW MED High Inspecting Burner Pilot Flame PatternBurner Flame Pattern If burner flame pattern is incorrect, as shown in FigureCabinet Cleaning and Maintenance Trouble ShootingODS/PILOT and Burner Orifice Air PassagewaysObserved Possible Remedy Problem Cause TROUBLE- ShootingTrouble Shooting See CleaningDo not try to light any appliance If you smell gasShut off gas supply Ing statement atVN1800D VN3000D Technical ServiceService Publications Hints Replacement Parts AccessoriesIllustrated Parts Breakdown Model VN1800ITAParts List Model VN2550ITA Parts List Model VN1800D Control Position Label Hardware Assembly Model VN3000D Parts List Warranty Information Keep this Warranty