Lochinvar 402 - 2072 operation manual Checking gas supply pressure, GAS Piping Size Chart

Page 33

3 Gas connections (continued)

Combination gas valve/regulators equipped with integral vent limiters are 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.

Checking gas supply pressure

Use the following procedure to check gas supply pressure.

Installation & Operation Manual

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

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

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

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

17.Set the electronic temperature control or thermostat to call for heat.

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 the “inlet” side of the

 

gas valve. You may also use a tapping on the field-installed

￿WARNING

After completing any testing on the gas system, leak test all gas connections. Apply a soap/water solution to all gas connections while main burners are operating. Bubbles forming indicate a leak. Repair all leaks at once. Do not operate this unit with a leak in the gas train, valves or related piping.

 

main manual gas cock or gas piping. Install a fitting in the

 

inlet pressure tapping suitable to connect to a manometer

 

or magnehelic 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 the 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 31 for minimum and

 

maximum gas supply pressures.

9.

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

 

control.

10.

If gas supply pressure is within normal range, turn the

 

power switch to the “OFF” position.

11.

Turn gas valve knobs to the “OFF” position.

12.

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

 

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

 

the tank.

Check burner performance by cycling the system while you observe burner response. Burners should ignite promptly. Flame pattern should be stable, see Burner Flames in the Copper-fin II Service Manual. Turn system off and allow burners to cool, then cycle burners again to ensure proper ignition and flame characteristics.

SUPPLYINLET

INLET

PRESSURE

TAP

GAS

 

 

 

OUTLET

 

 

VALVE

 

 

CONTROL

 

 

KNOB

 

 

MANOMETER

Figure 3-3_Measuring Gas Supply Pressure at Combination Gas Valve

TABLE - 3D

GAS PIPING SIZE CHART

Nominal

 

 

 

 

Length of Pipe in Straight Feet

 

 

 

 

 

Maximum

Iron Pipe

 

 

 

 

 

 

 

 

 

Capacity of Pipe

Size

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in Thousands of

10

20

30

40

50

60

70

80

90

 

100

125

150

175

200

Inches

 

Btu/hr per hour

3/4

369

256

205

174

155

141

128

121

113

 

106

95

86

79

74

for gas pressures

 

of 14 Inches

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

697

477

384

328

292

267

246

256

210

 

200

179

164

149

138

 

Water Column

1 1/4

1,400

974

789

677

595

543

502

472

441

 

410

369

333

308

287

(0.5 PSIG) or less

 

and a pressure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1/2

2,150

1,500

1,210

1,020

923

830

769

707

666

 

636

564

513

472

441

 

drop of 0.5 Inch

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

Water Column

 

(Based on NAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

GAS, 1025 Btu/hr

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

per Cubic Foot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of Gas and 0.60

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

 

Specific Gravity)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

33

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Contents Save this manual for future reference Models 402Contents Please read before proceeding Special instructionsRemoval of Combustion Chamber Lining or Base Panels Owner warning Safety informationCopper-fin II How it works Copper-fin II How it works Copper-fin II How it works Copper-fin =B=R Rating RatingsLocation of unit Determine unit locationIndoor clearances from combustible construction Freeze protectionLocation Outdoor boiler installationHydronic systems anti-freeze Combustion and ventilation airMinimum Recommended Combustion AIR Supply to Equipment Room Outside Combustion Air Using Direct VentingCombustion air filter Exhaust fansIdentify your appliance’s vent system VentingCAT IV Flue pipe materials CAT I Negative pressure non-condensingDirect Vent see General information Venting supportBarometric damper location Negative draft Conventional negative draft venting seeFlue outlet piping Common Venting SystemsMasonry chimney installations Vertical vent termination clearances and locationInspection of a masonry chimney 1Vent Termination from Peaked Roof 10 ft. or Less From Ridge Combustion air inlet piping Vertical DirectAire venting seeLength of air inlet pipe Sidewall air inletVertical Rooftop Air Inlet Combined air inlet pointsClearances Directaire Kits Model Horizontal KIT Vertical KIT Venting of flue productsSidewall with fan Sidewall venting seeSidewall venting termination Sidewall vent termination clearances and locationSidewall venting without fan Drain tee installationModels 402 Venting of flue products Horizontal DirectAire venting Powered Venting seeDirect venting see Flue outlet pipingVertical DV venting termination Horizontal DV venting termination Masonry chimney installationHorizontal Vent Termination Clearances and Location Combustion air inlet pipingAir inlet piping materials Connecting the air inlet pipe to the unitLength of air inlet pipe Sealing PVC, CPVC, ABS, dryer vent, and flex duct vent pipeVertical and sidewall combustion air inlet Multiple sidewall direct vent installationsHorizontal combustion air inlet clearances Vertical Combustion Air Inlet ClearancesOutdoor installation see Outdoor vent/air inlet locationOutdoor vent cap kit Gas connections Connecting to gas supplyGas pressure test Gas connectionCombination gas valves Gas train and controlsVenting of combination gas valves Checking gas supply pressure GAS Piping Size ChartWater connections Water flow switchInlet and outlet connections Heat exchangerRelief valve Heating boiler installationsPiping of the boiler system Water connections heating boilers onlyLow Temperature Return Water Systems Minimum boiler water temperaturesLow temperature bypass requirements LTV Valve Kits Model LTV Valve KITThree way valves in system Low system water volumeRadiant floor and snow melt heating systems Maximum Flow for Heating BoilerTypical heating boiler installations Temperature / pressure gaugeInstallation with a chilled water system DHW installationDiameter GPM4Primary/Secondary Piping of Multiple Boilers Floor Drain Heating Supply Loop 6Primary/Secondary Piping with Buffer Tank Electrical connections Installation must comply withBoiler operating control module AMP Draw DataEMS or remote thermostat connection Line voltage connectionsLow voltage connections DHW Domestic Hot Water thermostatAlarm contacts Louver proving switchLouver relay System supply sensor recommended use4Low Voltage Field Wiring Connections Wiring of the cascadeStart-up Check vent and air piping Check thermostat circuitsPlacing the boiler in operation Start the boiler1Lighting Instructions Configuration of the cascade Set DHW operationSet clock General Operating informationHow the appliance operates How the control module operatesProtection features Temperature controlBoiler temperature regulation Outdoor reset operation, if used boilers onlyCascade DHW, Night Setback, and Ramp Delay operation with cascade DAY Switching on SequenceSequence of the cascade Operation Display Sequence of operationCopper-fin II control module MENU/EXIT Display Screen ENTER/RESET UpdownInstaller Access modesUser To save parameters and exit programmingStatus display screens Inlet Open Inlet ***FInlet Shorted Syssup ***FDHW Pump Delay Unit Pump DelaySTG Demand FAN SpeedMIX VAL POS ** % Operation of the cascadeModel Temperature Rise F Temperature Rise AT Full Rate Fire 90 GPM FlowDomestic water heaters Maximum Water FlowWater chemistry 1Typical Water Heater Piping with Storage Tank 2Single Water Heater Piping with Two Storage Tanks 3Multiple Water Heater Piping with a Single Storage Tank 4Multiple Water Heater Piping with Multiple Storage Tanks Heat exchanger Pump operationMinimum Pump Performance Ft. HdThermostat adjustment procedure Minimum water temperatures domestic hot water useDomestic water temperatures Thermal expansion Optional relief valveCathodic protection Location of Cold Water Supply Piping ConnectionsMaintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Check control settings Check all wiringCheck relief valve Inspect/replace hot surface igniter Ignition system checkoutPerform start-up and checks Inspect and clean burnerCheck burner flame Check flue gas passagewaysInspect and clean the heat exchanger Review with ownerOiled bearing circulators Digital Harness Connection diagramSplay Ladder DiagramFlow Switch
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402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.
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