Lochinvar 500, 90 service manual Check Expansion Tank, Check Relief Valve

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Installation & Service Manual

8Maintenance

Check Expansion Tank

1.Expansion tanks provide space for water to move in and out as the heating system water expands due to temperature increase or contracts as the water cools. Tanks may be open, closed, diaphragm or bladder type. See Section 4 - Hydronic Piping for suggested best location of expansion tanks and air eliminators.

Check Relief Valve

1.Inspect the relief valve and lift the lever to verify flow. Before operating any relief valve, ensure that it is piped with its discharge in a safe area to avoid severe scald potential. Read Section 4 - Hydronic Piping before proceeding further.

￿WARNING

Following installation, the valve lever must be operated AT LEAST ONCE A YEAR to ensure that waterways are clear. Certain naturally occurring mineral deposits may adhere to the valve, rendering it inoperative. When manually operating the lever, water will discharge and precautions must be taken to avoid contact with hot water and to avoid water damage. Before operating lever, check to see that a discharge line is connected to this valve directing the flow of hot water from the valve to a proper place of disposal. Otherwise severe personal injury may result. If no water flows, valve is inoperative. Shut down the appliance until a new relief valve has been installed.

￿WARNING

Safety relief valves should be re-inspected

AT LEAST ONCE EVERY THREE YEARS, by a licensed plumbing contractor or authorized inspection agency, to ensure that the product has not been affected by corrosive water conditions and to ensure that the valve and discharge line have not been altered or tampered with illegally. Certain naturally occurring conditions may corrode the valve or its components over time, rendering the valve inoperative. Such conditions are not detectable unless the valve and its components are physically removed and inspected. This inspection must only be conducted by a plumbing contractor or authorized inspection agency – not by the owner. Failure to re-inspect the boiler relief valve as directed could result in unsafe pressure buildup, which can result in severe personal injury, death, or substantial property damage.

2.After following the above warning directions, if the relief valve weeps or will not seat properly, replace the relief valve. Ensure that the reason for relief valve weeping is the valve and not over-pressurization of the system due to expansion tank waterlogging or undersizing.

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Contents Models 90,000 500,000 Btu/hr Contents Please read before proceeding Checking equipmentCodes Ratings Copper-fin =B=R RatingCopper-fin Specifications Copper-fin How it works Gas connection pipeModels CWN270 Front View Model CWN399 Front View 422 Determine unit location Location of unitDetermine boiler location 3Combustion Air Direct from Outside6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Vent Pipe Sizes VentingConventional Negative Draft Venting System Venting Vertical Vent Termination Clearances Less from Ridge From Parapet WallMasonry Chimney Installation Vent MaterialsSidewall Venting NumberAutomatic Vent Damper 7CB with Vent Damper and Vent Damper Terminal BlockGas connections Gas Supply Gas Pressure TestGas Connection Manifold PressureInstall Piping to Control Gas PipingGas Manifold Pressure Adjustment Procedure Clockwise to raise regulator gas pressure, counterclockwiseChecking Gas Supply Pressure 4Gas Supply PressureTwo Stage Burner Control System Combination Gas ValvesVenting of Combination Gas Valves Relief Valve Water Flow Switch if equippedHydronic piping Typical Heating Boiler Installations Low Water Cutoff if equippedMinimum Required Flow For Heating Boiler General Plumbing RulesSystem Temperature Rise Chart Piping of the Boiler SystemHeat Exchanger Pressure Drop Chart Circulator Pump SpecificationsWater Connections Heating Boilers Only Circulator Pump RequirementsPrimary/Secondary Boiler Piping Three Way Valves Boiler Flow RatesPrimary / Secondary Piping 4Primary / Secondary Piping of a Single BoilerNot to Exceed 4 Pipe DIA or MAX. of 12 Apart 8Multiple Boilers Zoned with Circulators Terminal Strip Wiring Boiler Operating Temperature ControlPower Venter Connection to Terminal Strip Electrical connectionsOperating Temperature Control Temperature AdjustmentPump Wiring for a Heating Boiler Locating Temperature Control Temperature Control SettingsMaximum SET Point Determination Maximum Set Point DeterminationTemperature Control Sensors Inlet Water Temperature SensorMulti-Purpose Temperature Sensor Outdoor Air Temperature SensorInstallation of a Tank Sensor Water Heater Application Outdoor Air Reset OptionInstallation of a Remote Sensor Boiler Application Additional Temperature Controls Blocked Vent and Flame Roll-Out / Flame Interlock Switch Manual Reset High Water Temperature Limit ControlInitial Start-up Pre-start ChecklistStart-up Lighting Instructions 1Gas Valve 90,000 270,000 Btu/hr ModelsSafety Shutoff Test For Standing Pilot Ignition System To Turn OFF GAS to ApplianceOperating Instructions Safety Shutoff Test for Spark Ignition Pilot System Intermittent Pilot Spark Ignition System F9/M9Freeze Protection To Turn Off Gas to ApplianceWater Treatment Freeze Protection for a Heating Boiler System if requiredRequired Temperature Rise Required Temperature RiseDomestic water heaters Domestic Water Heaters 90,000 500,000 Btu/hr ModelsPump Operation Water ChemistrySoftened Water Systems 1Single water heatersingle tank 2Single water heatermultiple tank 3Multiple water heatersingle tank Remote Sensor Installation Thermostat SettingsMinimum Pump Performance Heat Exchanger5Danger Warning Water Flow Switch if equipped Pressure Only Relief ValveThermal Expansion Cathodic ProtectionMaintenance and annual startup Service technicianOwner maintenance See the User’s Information Manual for instructionsMaintenance Check Expansion Tank Check Relief ValveCheck All Wiring Check Control SettingsCombustion Air Adjustment Perform Start-up and ChecksInspection and Cleaning Procedure Inspect and Clean BurnerHeat Exchanger / Burner Access Pilot Flame Adjustment Procedure Clear AreaInspection of Heat Exchanger Waterways Water Circulating PumpReview with owner Gas Train and ControlsTroubleshooting Pilot or replace Diagrams Schematic Diagram F1 UnitWiring Diagram F1 Unit 90,000 270,000 Btu/hr Models315,000 399,999 Btu/hr Models Schematic Diagram F9 UnitWiring Diagram F9 Unit Diagrams Diagrams Page Revision a ECO #C06290 initial release CFA-I-S Rev a 09/10
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