Manuals / Lochinvar / Household Appliance / Water Heater

Lochinvar 497 - 2067 service manual CBX-CWX-I-SRev A 3/11

Models: 497 - 2067

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Revision Notes: Revision A (ECO #C07390) initial release.

CBX-CWX-I-S Rev A

3/11

Page 68

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Lochinvar 497 - 2067 service manual CBX-CWX-I-SRev A 3/11

Contents

CBX-CWX-I-SRev A Installation & Service Manual Models: 497 -WHAT TO DO IF YOU SMELL GAS Save this manual for future referenceHazard definitions NOTICEContents DANGERWarranty – Installation & Service ManualPlease read before proceeding Special instructionsSafety information Owner warning –Prevention of freezing – Codes –The Copper-fin- How it works Installation & Service ManualModels 497 - 747 Front View Models 497 - 747 Rear ViewModels 497 - 747 Right Side inside unit Models 497 - 747 Left Side inside unitThe Copper-fin- How it works... continued Models 987 - 2067 Front ViewModels 987 - 2067 Rear View Models 987 - 2067 Right Side inside unitOther Specifications RatingsCopper-fin I=B=R Rating NotesNotes Copper-finSpecificationsInstallation & Service Manual Installation 1 Determine unit locationLocating the unit Indoor clearances from combustible constructionOutdoor boiler installation 1 Determine unit location continuedShut-downand draining Freeze protectionTABLE 1B Combustion and Ventilation AirInstallation & Service Manual 1 Determine unit locationFigure 1-3 Combustionair filter Models Figure 1-4 Combustionair filter ModelsCombustion air filter Installation & Service Manual2. Outside Combustion Air, Using Ducts Figure 1-7_Outsidecombustion air, using ductsCombustion Air Options 1. Outside Combustion Air, No DuctsExhaust Fans 3. Combustion Air from an Interior SpaceFigure 1-8_Combustionair from an interior space Installation & Service Manual2 Venting General informationVenting support Vertical vent termination clearances and locationBarometric damper location TABLE 2AVent system options 1.Conventional negative draft venting Negative draftFlue outlet piping Common venting systemsMasonry chimney installation Inspection of a masonry chimneyInstallation & Service Manual Vertical vent termination clearances and location2. Outdoor installation venting Outdoor vent/air inlet locationInstallation & Service Manual 2 VentingFigure 2-6_Outdoorvent cap installed on Models Figure 2-7_Outdoorvent cap installed on ModelsOutdoor vent kit TABLE 2BConnecting to gas supply 3 Gas connectionsGas piping Gas pressure test3 Gas connections continued Gas connectionTABLE 3B TABLE 3CCombination gas valves TABLE 3DVenting of combination gas valves Checking gas supply pressureGas manifold pressure adjustment Installation & Service Manual3 Gas connections continued NOTICETABLE 3E Net Manifold Pressure Regulator Pressure Less Front Chamber PressureFigure 3-4_Measuringmanifold gas pressure Installation & Service ManualWater flow switch Heating boiler installations4 Water connections Inlet and outlet connectionsPressure Drop Chart Circulator pump specificationsPump delay operation Water connections heating boilers onlyMinimum boiler water temperatures Low system water volume4 Water connections continued Installation & Service ManualLow temperature return water systems TABLE 4ATABLE 4B Radiant floor and snow melt heating systemsInstallation & Service Manual 4 Water connections continuedCOMMON MANIFOLD SIZE Min Models: 497 - NOTICEInstallation & Service Manual 4 Water connections3 1/2 NOTICEFigure 4-7_Boilerwith low temperature bypass Installation & Service Manual4 Water connections continued TO FLOOR DRAINInstallation & Service Manual 1 TEMPERATURE AND PRESSURE GAUGE AUTOMATIC AIR4 Water connections NOTICEInstallation with a chilled water system Typical heating boiler installationsBoiler flow rate TABLE - 4CTemperature / pressure gauge Boiler bypass requirementsFilling the system Water treatmentConnecting to electrical supply 5 Electrical connectionsTABLE 5A Figure 5-1_Controlpanel locationENABLE Figure 5-5_Fieldinstallation safety devicesburners Terminal strip connection optionsTemperature adjustment Locating the temperature controlTemperature control settings Figure 5-7_Temperaturecontrol setting knobsOutdoor reset option Figure 5-8_Optionaloutdoor reset controlSetpoint DifferentialTemperature control sensors Inlet water temperature sensorMulti-purposetemperature sensor Outdoor air temperature sensorHot surface ignition system TABLE 5CRemote mounting of a sensor Hot surface igniter and ignition control moduleDiagnostic Status Indication Ignition and control timingsFigure 5-12_Hotsurface ignition control module Installation & Service ManualOperation and diagnostic lights Figure 5-13_Operation /diagnostic lightsTABLE 5E TABLE 5DInstallation & Service Manual 6 StartupFigure 6-1_Operatinginstructions Freeze protection when used Check/control water chemistryFill and test water system Purge air from water systemCheck for gas leaks Check thermostat circuitsCheck vent and air piping Start the boiler7 Domestic water heaters TABLE - 7ATABLE 7B Water velocity control7 Domestic water heaters continued Installation & Service ManualNOTICE BUILDING HOT WATER SUPPLY RELIEF VALVE LOCK-TEMPInstallation & Service Manual 7 Domestic water heatersNOTICE BUILDING HOT WATER SUPPLY RELIEF VALVE LOCK-TEMPInstallation & Service Manual 7 Domestic water heaters continuedCOMMON MANIFOLD SIZE Min NOTICEInstallation & Service Manual 7 Domestic water heatersNOTICE BUILDING HOT WATER SUPPLY RELIEF VALVERequired temperature rise TABLE 7CModels 497 - 1/4 HP, 120 VAC, 5.8 Amps Models 987 - 1/2 HP, 120 VAC, 7.4 AmpsPotable hot water temperature control settings Domestic water temperatureTABLE 7D Minimum pump performanceLocation of cold water supply piping connections Installation & Service Manual7 Domestic water heaters continued NOTICEHigh water temperature limit control Optional relief valveThermal expansion Cathodic protection8 Maintenance Flue gas passageways cleaning procedureBurner removal and cleaning Appliance areaHeat exchanger cleaning Fan cleaningCombustion air fan adjustment Adjusting air pressure8 Maintenance continued Adjustment procedure Models 497 -Adjustment procedure: Models 1437, 1797 and Figure 8-2_Airpressure switchFigure 8-6_Adjustingthe air shutter Sequence of operationIgnition system checkout OverviewHeat transfer process End of sequence8 Maintenance continued Installation & Service ManualPower Supply AC120VAC/60Hz ON/OFF Rocker SwitchManual Reset High-LimitThermostat Safety Device TerminalsPump Delay Electronic Thermostat Function Trial for Ignition Ignition Module FunctionIgniter Controlled by Ignition Module Hi-LoFire RelayInstallation & Service Manual 10 DiagramsLadder diagram 0987-20670497-747 Ladder diagram continued10 Diagrams continued Installation & Service Manual Connection diagram10 Diagrams 10 Diagrams continued Connection diagram continuedInstallation & Service Manual CBX-CWX-I-SRev A 3/11