Installation & Operation Manual

2 General venting (continued)

Table 2B Direct Vent Minimum / Maximum Allowable Air / Vent Lengths

 

 

AIR INLET

 

 

VENT

 

Input

 

 

 

 

 

 

 

Model

Air Intake

Air Intake

Air Intake

Vent

Vent

Vent

De-Rate per

 

Diameter

Min. Length

Max. Length

Diameter

Min. Length

Max. Length

25 feet of Vent

 

 

 

 

 

 

 

 

FB 1500

7"

12'

100'

7"

12'

100'

2%

FB 2000

8"

12'

100'

8"

12'

100'

2%

FB 2500

8"

12'

100'

9"

12'

100'

2%

FB 3000

10"

12'

100'

10"

12'

100'

2%

FB 3500

10"

12'

100'

10"

12'

100'

2%

 

 

 

 

 

 

 

 

Table 2C Room Air Minimum / Maximum Allowable Air / Vent Lengths

Model

Vent

Vent

Vent

Input De-Rate per

Diameter

Min. Length

Max. Length

25 feet of Vent

 

FB 1500

7"

12'

100'

1%

FB 2000

8"

12'

100'

1%

FB 2500

9"

12'

100'

1%

FB 3000

10"

12'

100'

1%

FB 3500

10"

12'

100'

1%

When determining equivalent combustion air and vent length, add 5 feet (1.5m) for each 90° elbow and 3 feet (.9 m) for each 45° elbow.

EXAMPLE: 20 feet (6 m) of pipe + (4) 90° elbows + (3) 45° elbows = 49 equivalent feet (15 m) of piping.

Removing from existing vent

Follow the instructions in Section 1, page 10 of this manual when removing a boiler from an existing vent system.

Vent and air piping

Vent and air system:

Installation must comply with local NOTICE requirements and with the National Fuel

Gas Code, NFPA 54 / ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.

You must also install air piping from outside to the boiler air intake adapter. The resultant installation is direct vent (sealed combustion).

You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Crest using any other means.

￿WARNING DO NOT mix components from different systems. The vent system could fail,

causing leakage of flue products into the living space. Use only approved stainless steel pipe and fittings.

Vent, air piping and termination:

The Crest vent and air piping can be installed through the roof or through a sidewall. Follow the procedures in this manual for the method chosen. Refer to the information in this manual to determine acceptable vent and air piping length.

Air contamination

Pool and laundry products and common household and hobby products often contain fluorine or chlorine compounds. When these chemicals pass through the boiler, they can form strong acids. The acid can eat through the boiler wall, causing serious damage and presenting a possible threat of flue gas spillage or boiler water leakage into the building.

Please read the information given in Table 1A, page 9, listing contaminants and areas likely to contain them. If contaminating chemicals will be present near the location of the boiler combustion air inlet, have your installer pipe the boiler combustion air and vent to another location, per this manual.

If the boiler combustion air inlet is located ￿ WARNING in a laundry room or pool facility, for

example, these areas will always contain hazardous contaminants.

To prevent the potential of severe personal ￿ WARNING injury or death, check for areas and products

listed in Table 1A, page 9 before installing the boiler or air inlet piping.

If contaminants are found, you MUST:

•Remove products permanently. —OR—

•Relocate air inlet and vent terminations to other areas.

17

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Lochinvar 3.5, 2.5 service manual Removing from existing vent
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3, 2, 3.5, 2.5 specifications

The Lochinvar 2, 3, 3.5, and 2.5 models are a standout lineup in the realm of commercial and residential water heating solutions. Known for their advanced technology and high efficiency, these units cater to a wide range of applications, ensuring optimal performance and reliability.

One of the key features of the Lochinvar models is their robust construction. Each unit is designed to withstand rigorous operational demands while providing excellent thermal efficiency. They are equipped with stainless steel heat exchangers, which offer superior resistance to corrosion and extend the lifespan of the equipment. This durability is essential for both commercial and residential settings where demand can vary significantly.

The Lochinvar 2, 3, 3.5, and 2.5 models utilize innovative control systems that enhance their operational efficiency and user convenience. The built-in Smart Control technology allows for easy monitoring and adjusting of system parameters, ensuring that users can maintain optimal performance with minimal effort. This feature is especially beneficial in commercial settings where large volumes of hot water are required, as it enables users to effectively manage their energy consumption.

Energy efficiency is another hallmark of the Lochinvar lineup. With high-efficiency ratings, these models help reduce energy costs significantly, making them an environmentally friendly option for heating water. The use of advanced combustion technology ensures that these units can deliver maximum heat output with minimal fuel consumption.

Additionally, the Lochinvar models are designed with safety and reliability in mind. They feature multiple safety controls and diagnostics that alert users to potential issues before they escalate, providing peace of mind. The integration of advanced venting options allows for flexible installation configurations, accommodating various building layouts and space requirements.

In summary, the Lochinvar 2, 3, 3.5, and 2.5 models define modern water heating technology with their combination of durability, efficiency, and advanced features. With their innovative design and user-friendly controls, they meet the demanding needs of both commercial and residential users, making them a top choice in the water heater market. Whether for new installations or replacements, these units deliver reliable performance and value.
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