Lochinvar 45000, 260000 service manual Gas Manifold Pressure Adjustment Procedure, 2Wrench

Page 20

3Gas connections

Installation & Service Manual

APPLY WRENCH TO FLANGE ONLY

WHEN FLANGE

IS USED

WHEN FLANGE IS

NOT USED

APPLY WRENCH FROM TOP OR BOTTOM OF GAS CONTROL TO EITHER SHADED AREA

1.

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

2.

Turn gas valve control knob to “OFF” position.

3.

Remove the 1/8" hex plug located on the outlet side of the

 

gas valve and install a fitting suitable to connect to a

 

manometer or magnahelic gauge. See FIG. 3-3. Minimum

 

range of scale should be up to 5" w.c. for Natural gas

 

models and 10" w.c. for L.P. gas models.

4.

Remove the pressure regulator adjustment cap screw on

 

the gas valve. See FIG. 3-3 for location.

5.

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

6.

Turn gas valve control knob to “ON” position.

7.

Set the thermostat(s) to call for heat.

Figure 3-2_Wrench

8.For L.P. gas, consult your L.P. gas supplier for expert installation.

8.

Observe gas regulator pressure when all burners are firing.

 

See Table 3B, Manifold Pressure (page 18) for proper

 

regulator pressure settings.

9.

If adjustment is necessary, turn regulator adjustment screw

IMPORTANT

Upon completion of any piping connections to the gas system, leak test all gas connections with a soap solution while system is under pressure. Immediately repair any leaks found in the gas train or related components. Do Not operate an appliance with a leak in the gas train, valves or related piping.

clockwise to raise regulator gas pressure, counterclockwise

to lower gas pressure, to proper setting. NOTE: Adjustment

fitting is plastic and may require slightly greater turning

force than a metal fitting.

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

NOTICE

Do not increase regulator pressure beyond

specified pressure setting.

 

Gas Manifold Pressure Adjustment Procedure

11. Turn gas valve control knob to “OFF” position.

INLET PRESSURE TAP

PRESSURE REGULATOR ADJUSTMENT (UNDER CAP SCREW)

OUTLET

PRESSURE TAP

PILOT OUTLET

12.

Remove fitting from the gas valve and replace the 1/8" hex

 

plug that was previously removed and tighten.

13.

Turn the gas valve control knob to “ON” position.

14.

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

 

appliance is now ready to operate.

GAS CONTROL KNOB

RED RESET BUTTON

MANOMETER

3.5"

GAS VALVE

Figure 3-3_Manifold Pressure Adjustment

If manifold pressure can not be properly adjusted, use the procedure on page 21 to check gas supply pressure with a manometer connected to the inlet pressure tap on the gas control.

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Contents Models 45,000 260,000 Btu/hr Contents Warranty Please read before proceedingCodes Solution Boiler =B=R Rating RatingsSolution How it works Temperature and pressure gaugeSolution How it works Solution How it works Determine boiler location Location of unit3Combustion Air Direct from Outside 6Combustion 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 Sidewall Venting Negative DraftVent Materials Fan Assisted VentingAutomatic Vent Damper 7Vent Damper and Vent Damper Terminal BlockGas Connection Gas connectionsGas Supply Gas Pressure Test Install Piping to Control Gas PipingGas Manifold Pressure Adjustment Procedure 2WrenchChecking Gas Supply Pressure 4Gas Supply PressureTwo Stage Burner Control System Combination Gas ValvesVenting of Combination Gas Valves Relief Valve Water Flow Switch if equippedWater connections Typical Heating Boiler Installations Low Water Cutoff if equippedMinimum Required Flow For Heating Boiler General Plumbing RulesSystem Temperature Rise Chart Piping of the Boiler SystemCirculator Pump Requirements Heat Exchanger Pressure Drop ChartWater Connections Circulator Pump Operation Circulator Pump SpecificationsPrimary/Secondary Boiler Piping Boiler Flow Rates Low Temperature Bypass RequirementsFull Flow Application Primary / Secondary Piping Make UP WaterMake UP Water 6Multiple Boilers Zoned with Circulators Full System Flow From System8Single Boiler Full System Flow with Low Temperature Bypass Terminal Strip Wiring Boiler Operating Temperature ControlElectrical connections Auxiliary Device Connection to Terminal StripTemperature Adjustment AMP Draw DataMaximum SET Point Determination Maximum Set Point DeterminationInstallation of Remote Sensors Outdoor Air Temperature SensorWiring of Remote Sensors Outdoor Air Reset Option Additional Temperature ControlsBlocked Vent and Flame Roll-Out / Flame Interlock Switch 7Blocked Vent Switch LocationPre-start Checklist Start-upInitial Start-up Lighting Instructions for Spark Ignition Pilot ModelsTo Turn Off Gas to Appliance Safety Shutoff Test for Spark Ignition Pilot SystemOperating Instructions Intermittent Pilot Spark Ignition System Freeze ProtectionWater Treatment Ignition and Control TimingsMaintenance Maintenance and annual startup Service technicianOwner maintenance See the User’s Information Manual for instructionsMaintenance Check Expansion Tank Check Relief ValveCheck All Wiring Check Control SettingsHeat Exchanger / Burner Access Perform Start-up and ChecksInspection and Cleaning Breathing Fresh airReview with owner Inspection of Heat Exchanger WaterwaysGas Train and Controls Water Circulating PumpTroubleshooting Troubleshooting Guide M9 Solution BoilersDiagrams Schematic Diagram M9 UnitWiring Diagram M9 Unit 45,000 260,000 Btu/hr Models 45,000 260,000 Btu/hr Models
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