Installation & Operation Manual

3 Gas connections

2.Use new, properly threaded black iron pipe free from chips. If you use tubing, make sure the ends are cut square, deburred and clean. Make all tubing bends smooth and without deformation. Avoid flexible gas connections. Internal diameter of flexible lines may not provide unit with proper volume of gas.

3.Install a manual main gas shutoff valve at the unit’s gas inlet, outside of the unit.

4.Run pipe or tubing to the unit’s gas inlet. If you use tubing, obtain a tube to pipe coupling to connect the tubing to the unit’s gas inlet.

5.Install a sediment trap in the supply line to the unit’s gas inlet (see FIG. 3-1).

6.Apply a moderate amount of good quality pipe compound (do not use Teflon tape) to pipe only, leaving two end threads bare.

7.Remove seal over gas inlet to unit.

8.Connect gas pipe to inlet of unit. Use wrench to support gas manifold on the unit.

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

10.Ensure that all air is completely bled from the gas line before starting the ignition sequence. Start up without properly bleeding air from the gas line may require multiple reset functions of the ignition control module to achieve proper ignition.

Do not have any open flame in proximity to ￿ WARNING the gas line when bleeding air from the gas

line. Gas may be present.

Gas train and controls

NOTICE

The gas train and controls assembly

provided on this unit have been tested under

 

 

the applicable American National Standard

 

to meet minimum safety and performance

 

criteria such as safe lighting, combustion

 

and safety shutdown operation.

 

402 MODEL

COMBINATION

 

VALVE

 

COMBINATION

2072 MODEL

VALVE

 

DOWNSTREAM

 

TEST VALVE

 

TO BURNERS

DOWNSTREAM

TEST VALVE

TO BURNERS

Figure 3-2_Typical Boiler Gas Train Drawing

TABLE 3B

SUGGESTED GAS PIPE SIZE FOR

SINGLE UNIT INSTALLATIONS

Distance from Meter (in feet)

MODEL

 

0 - 50

51 - 100

101 - 200

201-300 301-500

402

1 1/4"

1 1/4"

1 1/2"

2"

2"

502

1 1/4"

1 1/2"

2"

2"

2 1/2"

652

1 1/2"

2"

2"

2 1/2"

2 1/2"

752

1 1/2"

2"

2"

2 1/2"

3"

992

2"

2"

2 1/2"

2 1/2"

3"

1262

2"

2 1/2"

2 1/2"

3"

3"

1442

2 1/2"

2 1/2"

3"

3"

3 1/2"

1802

2 1/2"

3"

3"

3 1/2"

3 1/2"

2072

2 1/2"

3"

3"

3 1/2"

4"

For each elbow or tee, add equivalent straight pipe to total length from Table 3C.

TABLE - 3C

FITTINGS TO EQUIVALENT STRAIGHT PIPE

Diameter

 

 

 

 

 

 

 

 

Pipe

3/4

1

1 1/4

1 1/2

2

3

4

5

(inches)

 

 

 

 

 

 

 

 

Equivalent

 

 

 

 

 

 

 

 

length of

2

2

3

4

5

10

14

20

Straight Pipe

 

 

 

 

 

 

 

 

(feet)

 

 

 

 

 

 

 

 

Water heater models do not have downstream test valves, but the rest of the gas train is represented by FIG. 3-2.

Combination gas valves

These units fire in multiple stages of burner input. Each stage of burner operation has a combination gas valve(s) 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 stick 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 in the Copper-fin II Service Manual.

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 in the event of a failed gas diaphragm does not exceed the maximum safe leakage rate allowed by agency requirements.

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Lochinvar 402 - 2072 operation manual Combination gas valves, Gas train and controls, Venting of combination gas valves
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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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