Lochinvar 3.5, 2.5 service manual Removing from existing vent

Page 17

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.

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Contents Save this manual for future reference Contents Please read before proceeding When servicing boilerBlowers Crest How it worksCrest How it works Models 1.5 2.0 2.5 3.0 Crest Ahri Rating RatingsRecommended clearances for service access Installation must comply withDetermine boiler location Before locating the boiler, checkFlooring and foundation Provide air openings to roomVent and air piping Prevent combustion air contaminationAreas likely to have contaminants When using an existing vent system to install a new boilerProducts to avoid When removing a boiler from existing common vent system Remove boiler from wood pallet 7Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Optional room air General ventingDirect venting Air inlet pipe materials Install vent and combustion air pipingAir intake/vent connections Approved Stainless Steel Vent Manufacturers Make ModelRemoving from existing vent Common venting Vent/air termination vertical Vertical direct ventingDetermine location Prepare roof penetrations4Alternate Vertical Terminations with Multiple Boilers Multiple vent/air terminationsVent/air termination sidewall Sidewall direct venting2Clearance to Doors and Windows Prepare wall penetrations4Multiple Vent Terminations must also comply with Figure Room airHydronic piping 20F 40F 60F Circulator sizingModel Near boiler piping components Ball Valve Multiple Boilers Common Header Primary / Secondary Flow For all equipment and detailing required by local codes AIR Seperator Drain Port Typical System Supply Sensor Model Gas Inlet Size Connecting gas supply pipingGas connections Propane Gas Natural gasCheck inlet gas supply GAS Piping Size ChartGas Pressure Gas valve replacementLine voltage connections Field wiringInstallation must comply with Outdoor temperature sensor EnableLouver proving switch Low voltage connectionsAlarm contacts Auxiliary switch 1Wiring of the cascade System supply sensorField WiringCondensate drain Condensate disposalStart-up Freeze protection when usedCheck/control water chemistry Fill and test water systemCheck thermostat circuits Check for gas leaksInspect condensate system Inspect/check condensate lines and fittingsStart the boiler Final checks before starting the boilerIf boiler does not start correctly Check system and boilerFor Your Safety Read Before Operating Gas Natural Gas Propane Valve Set space heating operationSet clock Verify HWG circulator mode Set HWG target temperatureConfiguration of the cascade General Operating informationProtection features Outdoor reset operation, if used Boiler temperature regulationCascade Sequence of operation Home Screen Crest control module2Main Menu Screen Service technician Maintenance Maintenance and annual startupOwner maintenance See the Crest User’s Information Manual for InstructionsMaintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Check flame signalReview with owner Cleaning boiler heat exchangerHandling ceramic fiber materials Niosh stated First AidIntegrated Control Diagrams2Wiring Diagram
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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.

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