Lochinvar 90, 500 service manual Gas Manifold Pressure Adjustment Procedure

Page 21

3Gas connections (continued)

 

WHEN FLANGE

 

IS USED

 

WHEN FLANGE

APPLY WRENCH

IS NOT USED

TO FLANGE ONLY

 

APPLY WRENCH FROM

BOTTOM OF GAS CONTROL

TO EITHER SHADED AREA

Figure 3-2_Wrench

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

Installation & Service Manual

1.

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

2.

Turn gas valve control knob to “PILOT” position on

 

standing pilot models. Ensure that the standing pilot

 

remains on. If the pilot goes out, follow the “Lighting

 

Instructions” in Section 6 - Startup for standing pilot

 

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

 

“OFF” position on spark ignition models.

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.

The 500,000 Btu/hr model will have two gas valves with a

 

pressure regulator on each valve. Repeat the following

 

adjustment procedure to set the manifold pressure on each

 

gas valve.

5.

Remove the pressure regulator adjustment cap screw on

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.

 

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

6.

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

7.

Turn gas valve control knob to “ON” position.

8.

Set the thermostat(s) to call for heat.

9.

Observe gas regulator pressure when all burners are firing.

 

See Table 3B, Manifold Pressure (page 19) for proper

 

regulator pressure settings.

Gas Manifold Pressure Adjustment Procedure

10. If adjustment is necessary, turn regulator adjustment screw

clockwise to raise regulator gas pressure, counterclockwise

INLET

PRESSURE

TAP

MANOMETER

PRESSURE REGULATOR

ADJUSTMENT

(UNDER SCREW CAP)

OUTLET

PRESSURE TAP

PILOT OUTLET

GAS CONTROL KNOB

RED RESET BUTTON

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

fitting is plastic and may require slightly greater turning

force than a metal fitting.

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

NOTICE

Do not increase regulator pressure beyond

specified pressure setting.

 

 

12.

Turn gas valve control knob to “PILOT” position on

 

standing pilot models. Turn gas valve control knob to

 

“OFF” position on spark ignition models.

13.

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

 

plug that was previously removed and tighten.

14.

Repeat the adjustment procedure for the second gas valve

 

on the 500,000 Btu/hr model.

15.

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

16.

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

UNION

GAS VALVE

Figure 3-3_Manifold Pressure Adjustment

appliance is now ready to operate.

If manifold pressure can not be properly adjusted, use the procedure on page 22 to check gas supply pressure with a manometer connected to the inlet pressure tap on the gas control.

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Contents Models 90,000 500,000 Btu/hr Contents Checking equipment Please read before proceedingCodes Copper-fin =B=R Rating RatingsCopper-fin Specifications Gas connection pipe Copper-fin How it worksModels CWN270 Front View Model CWN399 Front View 422 Location of unit Determine unit location3Combustion Air Direct from Outside Determine boiler location6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Venting Conventional Negative Draft Venting SystemVent Pipe Sizes Venting Less from Ridge From Parapet Wall Vertical Vent Termination ClearancesVent Materials Masonry Chimney InstallationSidewall Venting Number7CB with Vent Damper and Vent Damper Terminal Block Automatic Vent DamperGas Supply Gas Pressure Test Gas connectionsGas Connection Manifold PressureGas Piping Install Piping to ControlClockwise to raise regulator gas pressure, counterclockwise Gas Manifold Pressure Adjustment Procedure4Gas Supply Pressure Checking Gas Supply PressureCombination Gas Valves Venting of Combination Gas ValvesTwo Stage Burner Control System Water Flow Switch if equipped Hydronic pipingRelief Valve Low Water Cutoff if equipped Typical Heating Boiler InstallationsMinimum Required Flow For Heating Boiler General Plumbing RulesPiping of the Boiler System System Temperature Rise ChartCirculator Pump Specifications Heat Exchanger Pressure Drop ChartWater Connections Heating Boilers Only Circulator Pump RequirementsPrimary/Secondary Boiler Piping Boiler Flow Rates Three Way Valves4Primary / Secondary Piping of a Single Boiler Primary / Secondary PipingNot to Exceed 4 Pipe DIA or MAX. of 12 Apart 8Multiple Boilers Zoned with Circulators Boiler Operating Temperature Control Terminal Strip WiringPower Venter Connection to Terminal Strip Electrical connectionsTemperature Adjustment Pump Wiring for a Heating BoilerOperating Temperature Control Temperature Control Settings Locating Temperature ControlMaximum SET Point Determination Maximum Set Point DeterminationInlet Water Temperature Sensor Temperature Control SensorsMulti-Purpose Temperature Sensor Outdoor Air Temperature SensorOutdoor Air Reset Option Installation of a Remote Sensor Boiler ApplicationInstallation of a Tank Sensor Water Heater Application Additional Temperature Controls Manual Reset High Water Temperature Limit Control Blocked Vent and Flame Roll-Out / Flame Interlock SwitchPre-start Checklist Start-upInitial Start-up 1Gas Valve 90,000 270,000 Btu/hr Models Lighting InstructionsTo Turn OFF GAS to Appliance Safety Shutoff Test For Standing Pilot Ignition SystemOperating Instructions Intermittent Pilot Spark Ignition System F9/M9 Safety Shutoff Test for Spark Ignition Pilot SystemFreeze Protection To Turn Off Gas to ApplianceFreeze Protection for a Heating Boiler System if required Water TreatmentRequired Temperature Rise Required Temperature RiseDomestic water heaters Domestic Water Heaters 90,000 500,000 Btu/hr ModelsWater Chemistry Softened Water SystemsPump Operation 1Single water heatersingle tank 2Single water heatermultiple tank 3Multiple water heatersingle tank Thermostat Settings Remote Sensor InstallationMinimum Pump Performance Heat Exchanger5Danger Warning Pressure Only Relief Valve Water Flow Switch if equippedThermal Expansion Cathodic ProtectionService technician Maintenance and annual startupOwner maintenance See the User’s Information Manual for instructionsMaintenance Check Relief Valve Check Expansion TankCheck Control Settings Check All WiringCombustion Air Adjustment Perform Start-up and ChecksInspect and Clean Burner Heat Exchanger / Burner AccessInspection and Cleaning Procedure Clear Area Pilot Flame Adjustment ProcedureInspection of Heat Exchanger Waterways Water Circulating PumpGas Train and Controls Review with ownerTroubleshooting Pilot or replace Schematic Diagram F1 Unit DiagramsWiring Diagram F1 Unit 90,000 270,000 Btu/hr ModelsSchematic Diagram F9 Unit Wiring 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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