Lochinvar 500, 90 service manual Checking Gas Supply Pressure, 4Gas Supply Pressure

Page 22

Installation & Service Manual

3Gas connections

Checking Gas Supply Pressure

MANOMETER

GAS SUPPLY PRESSURE

GAS VALVE

UNION

Figure 3-4_Gas Supply Pressure

1.

Turn the power “OFF” at the main disconnect

 

switch.

2.

Turn gas valve control knob(s) to the “OFF” position.

3.

The 500,000 Btu/hr model will have two gas valves. Turn

 

the gas valve control knob on each valve to the “OFF”

 

position.

4.

Shut off gas supply at the manual valve in the gas piping

 

to the appliance. If fuel supply is L.P. gas, shut off gas

 

supply at the tank.

5.

Remove the 1/8" hex plug, located on the “inlet” side of

 

the gas valve and install a fitting suitable to connect to a

 

manometer or magnahelic gauge. On two gas valve

 

models, remove the hex plug from the gas valve closest to

 

the gas supply connection. Range of scale should be

 

14" w.c. or greater to check inlet pressure. See FIG.’s 3-3

9.Set the thermostat(s) to call for heat.

10.Observe the gas supply pressure with all burners firing. Ensure inlet pressure is within specified range. Check gas supply pressure with all other gas fired appliances in operation to ensure proper gas volume during periods of peak gas usage.

11.If gas pressure is out of range, contact gas utility, gas supplier, qualified installer or service agency to determine necessary steps to provide proper gas pressure to the appliance.

12.If the gas supply pressure is within the specified range, proceed with the following steps to return the appliance to service.

13.Turn the power “OFF” at the main disconnect switch.

14.Turn gas valve control knob to “PILOT” position on standing pilot models. Turn gas valve control knob(s) to “OFF” position on spark ignition models.

15.Shut off gas supply at the manual valve in the gas piping to the appliance. If fuel supply is L.P. Gas, shut off gas supply at the tank.

16.Remove the manometer and related fittings from the “inlet” side of the gas valve, replace 1/8" hex plug in gas valve.

17.Turn on gas supply at the manual valve, turn on L.P. Gas at tank if required.

18.Turn the power “ON” at the main disconnect switch.

19.Turn the gas valve control knob(s) to the “ON” position. If the pilot is not burning, follow the “Lighting Instructions” in Section 6 - Startup for standing pilot models to light the pilot. Spark ignition models will automatically light the pilot on a call for heat.

20.Set the thermostat to call for heat. The appliance is now ready to operate.

 

and 3-4 for location.

6.

Turn on gas supply at the manual valve, turn on L.P. gas

 

at tank if required.

7.

Turn the power “ON” at the main disconnect switch.

8.

Turn gas valve control knob to “PILOT”

 

position on standing pilot models. Follow the “Lighting

 

Instructions” in Section 6 - Startup for standing pilot

IMPORTANT

Upon completion of any testing on the gas system, leak test all gas connections with a soap solution while main burners are operating. Immediately repair any leak found in the gas train or related components. Do Not operate an appliance with a leak in the gas train, valves or related piping.

models to light the pilot . Turn gas valve control knob to

the “ON” position when the pilot is established. Turn

gas valve control knob(s) to the “ON” position on spark

ignition models.

Check burner performance by cycling the system while you observe burner response. Burners should ignite promptly. Flame pattern should be stable, see the “Maintenance Section - Normal Flame Pattern”. Turn system off and allow burners to cool, then cycle burners again to ensure proper ignition and flame characteristics.

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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 Conventional Negative Draft Venting System VentingVent Pipe Sizes Venting Vertical Vent Termination Clearances Less from Ridge From Parapet WallSidewall Venting Masonry Chimney InstallationVent Materials NumberAutomatic Vent Damper 7CB with Vent Damper and Vent Damper Terminal BlockGas Connection Gas connectionsGas Supply Gas Pressure Test Manifold PressureInstall Piping to Control Gas PipingGas Manifold Pressure Adjustment Procedure Clockwise to raise regulator gas pressure, counterclockwiseChecking Gas Supply Pressure 4Gas Supply PressureVenting of Combination Gas Valves Combination Gas ValvesTwo Stage Burner Control System Hydronic piping Water Flow Switch if equippedRelief Valve Minimum Required Flow For Heating Boiler Typical Heating Boiler InstallationsLow Water Cutoff if equipped General Plumbing RulesSystem Temperature Rise Chart Piping of the Boiler SystemWater Connections Heating Boilers Only Heat Exchanger Pressure Drop ChartCirculator Pump Specifications 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 Power Venter Connection to Terminal Strip Terminal Strip WiringBoiler Operating Temperature Control Electrical connectionsPump Wiring for a Heating Boiler Temperature AdjustmentOperating Temperature Control Maximum SET Point Determination Locating Temperature ControlTemperature Control Settings Maximum Set Point DeterminationMulti-Purpose Temperature Sensor Temperature Control SensorsInlet Water Temperature Sensor Outdoor Air Temperature SensorInstallation of a Remote Sensor Boiler Application Outdoor Air Reset OptionInstallation of a Tank Sensor Water Heater Application Additional Temperature Controls Blocked Vent and Flame Roll-Out / Flame Interlock Switch Manual Reset High Water Temperature Limit ControlStart-up Pre-start ChecklistInitial Start-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 Freeze Protection Safety Shutoff Test for Spark Ignition Pilot SystemIntermittent Pilot Spark Ignition System F9/M9 To Turn Off Gas to ApplianceWater Treatment Freeze Protection for a Heating Boiler System if requiredDomestic water heaters Required Temperature RiseRequired Temperature Rise Domestic Water Heaters 90,000 500,000 Btu/hr ModelsSoftened Water Systems Water ChemistryPump Operation 1Single water heatersingle tank 2Single water heatermultiple tank 3Multiple water heatersingle tank Minimum Pump Performance Remote Sensor InstallationThermostat Settings Heat Exchanger5Danger Warning Thermal Expansion Water Flow Switch if equippedPressure Only Relief Valve Cathodic ProtectionOwner maintenance Maintenance and annual startupService technician See the User’s Information Manual for instructionsMaintenance Check Expansion Tank Check Relief ValveCombustion Air Adjustment Check All WiringCheck Control Settings Perform Start-up and ChecksHeat Exchanger / Burner Access Inspect and Clean BurnerInspection and Cleaning Procedure Inspection of Heat Exchanger Waterways Pilot Flame Adjustment ProcedureClear Area Water Circulating PumpReview with owner Gas Train and ControlsTroubleshooting Pilot or replace Wiring Diagram F1 Unit DiagramsSchematic Diagram F1 Unit 90,000 270,000 Btu/hr ModelsWiring Diagram F9 Unit Schematic Diagram F9 Unit315,000 399,999 Btu/hr Models Diagrams Diagrams Page Revision a ECO #C06290 initial release CFA-I-S Rev a 09/10
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