Installation and

Service Manual

Gas Train and Controls

Note: 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.

COMBINATION VALVE

DOWNSTREAM

TEST VALVE

FIG. 28 Gas Line Connection

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.

TO BURNERS

ADDITIONAL VALVES BASED

 

ON UNIT INPUTS

FIG. 29 Typical Boiler Gas Train Drawing

TABLE-J

Suggested Gas Pipe Size for Single Unit Installations

3.

Install a manual main gas shutoff valve at the unit’s gas

Btu/hr

 

 

 

Distance From Meter (in feet)

 

inlet, outside of the unit.

Input

0-50

51-100

101-200

201-300

301-500

 

 

4.

Run pipe or tubing to the unit’s gas inlet. If you use tubing,

399,999

 

1 1/4"

 

1 1/4"

 

1 1/2"

 

2"

 

2"

 

 

 

 

 

 

obtain a tube to pipe coupling to connect the tubing to the

 

 

 

 

 

 

unit’s gas inlet.

 

 

1 1/4"

 

1 1/2"

 

2"

 

2"

 

2 1/2"

5.

Install a sediment trap in the supply line to the unit’s gas

500,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

inlet (see FIG. 28).

650,000

 

1 1/2"

 

2"

 

2"

 

2 1/2"

 

2 1/2"

 

 

 

 

 

 

 

6.

Apply a moderate amount of good quality pipe compound

 

 

 

 

 

 

 

 

 

 

 

750,000

 

1 1/2"

 

2"

 

2"

 

2 1/2"

 

3"

 

(do not use Teflon tape) to pipe only, leaving two end

 

 

 

 

 

 

threads bare.

 

 

 

 

 

 

 

 

 

 

 

 

990,000

 

2"

 

2"

 

2 1/2"

 

2 1/2"

 

3"

7.

Remove seal over gas inlet to unit.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8.

Connect gas pipe to inlet of unit. Use wrench to support

1,260,000

 

2"

 

2 1/2"

 

2 1/2"

 

3"

 

3"

 

gas manifold on the unit.

 

 

 

 

 

 

 

 

 

 

 

 

1,440,000

 

2 1/2"

 

2 1/2"

 

3"

 

3"

 

3 1/2"

9.

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

 

 

 

 

 

 

installation.

 

 

 

 

 

 

 

 

 

 

 

 

1,800,000

 

2 1/2"

 

3"

 

3"

 

3 1/2"

 

3 1/2"

10.

Ensure that all air is completely bled from the gas line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

before starting the ignition sequence. Start up without

2,070,000

 

2 1/2"

 

3"

 

3"

 

3 1/2"

 

4"

 

properly bleeding air from the gas line may require

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

multiple reset functions of the ignition control module to

For each elbow or tee, add equivalent straight pipe to total length from table

 

achieve proper ignition.

below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 29 on this page shows a typical boiler gas train.

WARNING: Do not have any open flame in proximity to the gas line when bleeding air from the gas line. Gas may be present.

TABLE-K

Fittings to Equivalent Straight Pipe

Diameter Pipe (inches)

3/4

1

1 1/4

1 1/2

2

3

4

5

 

 

 

 

Equivalent Length of Straight Pipe (feet)

 

2

2

3

4

5

10

14

20

29

Page 28 Page 30
Page 29
Image 29
Lochinvar 399 Gas Train and Controls, Table-J, Btu/hr Distance From Meter in feet, Input 51-100 101-200 201-300 301-500
Page 28 Page 30

399, CF-CH(E)-i&s-08, 999 - 750 specifications

Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 is a cutting-edge boiler designed for commercial heating applications. With its robust construction and high efficiency, this model stands out in the crowded market of heating solutions.

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Safety is a top priority with this model. It is built with multiple safety features such as automatic shut-off valves, pressure relief valves, and flame monitoring systems, ensuring safe operation under various conditions. The unit also adheres to stringent industry standards and regulations, making it a reliable choice for commercial applications.

Furthermore, the Lochinvar 999 - 750 is designed with serviceability in mind. Its compact footprint and accessible components simplify maintenance, reducing downtime and associated costs. The unit also supports a variety of fuel sources, including natural gas, propane, and biodiesel, providing flexibility to meet different facility requirements.

In summary, the Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 represents a blend of efficiency, reliability, and safety in commercial heating. Its advanced technologies and thoughtful design make it a powerful solution for various heating needs, making it an ideal choice for businesses aiming for excellence in energy management and operational efficiency.
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