Lochinvar 495, 065, 000 - 2 service manual Combination Gas Valves, Checking Gas Supply Pressure

Page 18

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION

Continued

Water heater models do not have downstream test valves, but the rest of the gas train is represented by Figure 19.

not required to have vent or relief lines piped to the outdoors. The termination of the vent limited opening on the combination gas valve/regulator complies with the safety code requirements of CSD-1, CF-190(a) as shipped from the appliance manufacturer without the installation of additional vent lines.

Combination Gas Valves

These units fire in up to 2 stages of burner input. Each stage of burner operation has a combination gas valve or series of gas valves to cycle the gas supply on and off and regulate gas to the burners. Each combination valve consists of a gas regulator and two valve seats to meet the requirements for redundant gas valves. The valve has a gas control knob that must remain in the open position at all times when the unit is in service. The gas control valve has pressure taps located on the inlet and discharge sides of the valve. Manifold pressure is adjusted using the regulator located on the valve. A manifold gas pressure tap for each burner stage is located on the discharge side of the valve.

The manifold pressure is preset at the factory and adjustment is not usually required. If you must adjust regulator pressure, follow the instructions under Gas Manifold Pressure Adjustment, page 19.

Venting of Combination Gas Valves

The combination gas valve/regulator used on all units is equipped with an integral vent limiting orifice per ANSI Z21.78. The vent limiter ensures that the volume of gas emitted from the valve does not exceed the maximum safe leakage rate allowed by agency requirements. Combination gas valve/regulators equipped with integral vent limiters are

Checking Gas Supply Pressure

Use the following procedure to check gas supply pressure.

1.Turn the main power switch to the "OFF" position.

2.Turn gas valve knobs to the "OFF" position.

3.Shut off gas supply at the field-installed manual gas cock in the gas piping to the unit. If fuel supply is L.P. gas, shut off gas supply at the tank.

4.Remove the 1/8" hex plug, located on “inlet” side of the gas valve. You may also use a tapping on the field-installed main manual gas cock or gas piping. Install a fitting in the inlet pressure tapping suitable to connect to a manometer or magnahelic gauge. Range of scale should be 14" w.c. or greater to check inlet pressure.

5.Turn on gas supply at the manual gas cock, turn on L.P. gas at tank if required.

6.Turn the power switch to the “ON” position.

7.Turn the gas valve knobs to the “ON” position. Set the electronic temperature control or thermostat to call for heat.

8.Observe the gas supply pressure as all burners are firing. Ensure that inlet pressure is within the specified range. See Connecting To Gas Supply, page 16 for minimum and maximum gas supply pressures.

TABLE - H

Multiple Unit Installations Gas Supply Pipe Sizing

Nominal Iron

 

 

 

 

Length of Pipe In Straight Feet

 

 

 

 

Pipe Size,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Inches)

10

20

30

40

50

60

70

80

90

100

125

150

175

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3/4"

369

256

205

174

155

141

128

121

113

106

95

86

79

74

1"

697

477

384

328

292

267

246

226

210

200

179

164

149

138

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1/4"

1,400

974

789

677

595

543

502

472

441

410

369

333

308

287

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1/2"

2,150

1,500

1,210

1,020

923

830

769

707

666

636

564

513

472

441

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2"

4,100

2,820

2,260

1,950

1,720

1,560

1,440

1,330

1,250

1,180

1,100

974

871

820

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-1/2"

6,460

4,460

3,610

3,100

2,720

2,460

2,310

2,100

2,000

1,900

1,700

1,540

1,400

1,300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3"

11,200

7,900

6,400

5,400

4,870

4,410

4,000

3,800

3,540

3,300

3,000

2,720

2,500

2,340

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4"

23,500

16,100

13,100

11,100

10,000

9,000

8,300

7,690

7,380

6,870

6,150

5,640

5,130

4,720

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum capacity of pipe in thousands of BTU’s per hour for gas pressures of 14 Inches Water Column (0.5 PSIG) or less and a total system pressure drop of 0.5 Inch Water Column (Based on NAT GAS, 1025 BTU’s per Cubic Foot of Gas and 0.60 Specific Gravity).

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Contents Domestic Water Heaters Save this manual for future referenceHydronic Heating Boilers and Domestic Water Heaters Safety Information General Product InformationHydronic Heating Boilers and Domestic Water Heaters Product Identification Front and Rear ViewInstallation Clearances from Combustible ConstructionBase for Combustible Floors Shut-Down and Draining Outdoor Boiler InstallationHydronic System Antifreeze Pump OperationInstalling Combustion Air Filter Freeze Protection for a Heating Boiler System if requiredCombustion Air Filter Combustion Air Options One OpeningExhaust Fans Installation VentingGeneral Information Venting SupportTABLE-A Flue Pipe Sizes Vent System OptionsTable B TABLE-CFlue Outlet Piping Conventional Negative Draft VentingNegative Draft Common Venting SystemsOutdoor Installation Venting Masonry Chimney InstallationsOutdoor Vent/Air Inlet Location Table DOutdoor Vent Kits Outdoor Vent KitGas Pressure Test Gas PipingInput Max Min Connecting Gas Piping to Unit Gas Train and ControlsCombination Gas Valves Checking Gas Supply PressureVenting of Combination Gas Valves Gas Manifold Pressure Adjustment Measuring Gas Supply Pressure at Combination Gas ValveNET Manifold Pressure Regulator Pressure Less Front Chamber PressureRelief Valve Water Flow SwitchLow Water Cutoff If EquippedTerminal Strip Connection Options Table JNominal AMP Draw Data Water Connections Heating Boilers Only General Plumbing RulesPrimary/Secondary Boiler Piping Low Temperature Return Water Systems Radiant Floor and Snow Melt Heating SystemsInput LTV Valve Kit Btu/hr Table L Installation with a Chilled Water SystemSystem Temperature Rise Chart Based on Btu/hr Input 10ºF 20ºF 30ºF 40ºF 50ºF 60ºFBoiler Bypass Requirements Temperature/Pressure GaugeBoiler Flow Rate Filling the SystemOperation Lighting InstructionsLocating Temperature Control To Turn Off Gas To ApplianceSet Point Temperature Control SettingsTable M Maximum Set Point DeterminationShutdown Outdoor Air Reset OptionHigh-Fire Offset Outdoor Air Max O.A. MaxBoiler Application Temperature Control SensorsPlacement of Sensors Water Heater ApplicationHot Surface Igniter and Ignition Control Module Remote Wire ConnectionWire Maximum Gauge Table NIgnition and Control Timings Diagnostic Status IndicationHot Surface Ignition Control Module Ignition Module Lockout FunctionsStatus LED Diagnostic Codes Table OTable P Domestic Water Heaters Required Temperature RiseTemperature Rise Chart Water Velocity ControlCirculating Pump Pipe Sizing ChartWater Chemistry Table RDomestic Water Potable Hot Water Temperature Control SettingsDomestic Water Temperatures Minimum Pump PerformanceOptional Relief Valve High Water Temperature Limit ControlLocation of Cold Water Supply Piping Connections Thermal ExpansionCleaning Maintenance Flue Gas Passageways Cleaning ProceduresHeat Exchanger Cleaning ElectricalCombustion and Ventilation Air Cleaning and Maintenance Set Up ProcedureAdjustment Procedure 495,000 1,255,000 Btu/hr Models Servicing Hot Surface Igniter and Ignition Module Sequence of Operation Ignition System CheckoutManual Reset High-Limit Thermostat Power SupplyON/OFF Rocker Switch Safety Device TerminalsElectronic Temperature Controller Ignition ModuleHeat Transfer Process Gas Valves, Burner Schematic Diagram BTU/HRHI-LIMITS PWR SW Main Unit GAS Valves Blower Pressure Switch Wiring Diagram 15AMPSControl BOX Connections Control BOX Connections

000 - 2, 065, 495 specifications

Lochinvar 000 - 2,495,065 is a cutting-edge water heating solution designed to meet the needs of modern residential and commercial applications. This high-efficiency unit combines advanced engineering with robust technologies, providing unmatched performance and reliability.

One of the standout features of the Lochinvar 000 - 2,495,065 is its high thermal efficiency, which often exceeds 95%. Utilizing condensing technology, the unit harnesses heat from exhaust gases, allowing it to recover otherwise lost energy, thereby reducing operational costs significantly. This efficiency not only lowers energy bills for users but also lessens the environmental impact by minimizing greenhouse gas emissions.

The Lochinvar 000 - 2,495,065 is equipped with a lightweight stainless steel heat exchanger. This construction ensures exceptional corrosion resistance and longevity, extending the lifespan of the unit while maintaining optimal performance. The stainless steel design also contributes to faster heating times, making it ideal for high-demand environments.

In terms of control technologies, the Lochinvar 000 - 2,495,065 features an intuitive touchscreen interface. This user-friendly design allows for seamless operation, real-time monitoring, and easy adjustments to temperature settings. Additionally, it facilitates remote diagnostics, promoting efficient maintenance and reducing downtime, which is crucial for busy facilities.

For enhanced safety, the Lochinvar 000 - 2,495,065 includes multiple safety mechanisms, such as over-temperature protection, flame safeguard, and leak detection systems. These safety features ensure secure operation and give users peace of mind.

Moreover, the unit is compatible with various fuel sources, including natural gas and propane, making it versatile and adaptable to different infrastructure requirements. This flexibility ensures that the Lochinvar 000 - 2,495,065 can be integrated into various settings, from residential homes to large commercial buildings.

Another significant characteristic is its compact design, allowing for easy installation in tight spaces. The footprint of the Lochinvar 000 - 2,495,065 makes it an ideal solution for applications where space is at a premium, without compromising on performance.

In summary, Lochinvar 000 - 2,495,065 represents a premium choice for water heating solutions, merging advanced technologies, high efficiency, and user-friendly design to cater to a wide range of heating needs while ensuring safety and sustainability.
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