Lochinvar

Btu (22 cm2 per kW) of input, but not less than 100 square inches (645 cm2).

VENTING

General

Copper-Fin II Water Heaters are classified as Category I appliances when tested to the latest ANSI Standard. This classification requires all conventionally vented combustion products to be vented using Category I listed vent pipe.

CAUTION!

EXHAUST FANS:

Any fan or equipment which exhausts air from the equipment room may deplete the combustion air supply and/or cause a down draft in the venting system. If a fan is used to supply combustion air to the equipment room, it must by sized such to make sure that it does not cause drafts which could lead to nuisance operational problems with the water heater.

(FIG. 6) COMBUSTION AIR FROM OUTSIDE,

SINGLE OPENING

4.If a single combustion air opening is provided to bring combustion air in directly from the outdoors, the opening must be sized based on a minimum free area of one square inch per 3000 Btu input (7 cm2 per kW). This opening must be located within 12” (30 cm) of the top of the enclosure.

CONTAMINANTS

Combustion air drawn from an interior or exterior space must be free of any chemical fumes which could be corrosive to the water heater.

Burning chemical fumes results in the formation of corrosive acids which attack the water heater, cause improper combustion and premature failure of the water heater and vent.

These fumes are often present in areas where refrigerants, salts, and solvents are used. Therefore, be aware of swimming pool equipment, water softening, and cooling system placement.

Additionally, it is recommended that this vent material be double wall construction or insulated in the field. A Category I appliance operates with a non-positive static vent pressure and with flue loss greater than 17 percent.

Vent installations for connection to gas vents or chimneys must be in accordance with Part 7, “Venting of Equipment,” of the latest edition of the National Fuel Gas Code, ANSI Z223.1, or applicable provisions of the local building codes.

The connection from the appliance vent to the stack must be as direct as possible and sized correctly. The horizontal breeching of a vent must have at least 1/4” rise per linear foot. The horizontal portions should also be supported for the design and weight of the material employed to maintain clearances, prevent physical damage and separation of joints.

The connection from the appliance vent to the stack or vent termination outside the building must be made with listed

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Lochinvar CW 745, CW 645 manual Venting, Contaminants, General, Exhaust Fans
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CW 645, CW 745 specifications

The Lochinvar CW 645 and CW 745 are advanced water heater models from Lochinvar, a leading manufacturer of water heating solutions. These high-efficiency units are designed to meet the demands of both commercial and residential applications, combining cutting-edge technology with robust performance.

One of the defining features of the CW series is its commitment to energy efficiency. With their stainless steel construction, these water heaters boast a high thermal efficiency rating. The CW 645 and CW 745 utilize modulating technology, allowing them to adjust the heating output based on real-time demand. This results in reduced energy consumption and lower operational costs, making them an ideal choice for environmentally conscious consumers.

These models are equipped with a powerful burner system designed to provide optimal heating performance. The burners are engineered for reliability and longevity, ensuring consistent hot water supply even under heavy usage. Additionally, the CW 645 and CW 745 feature a compact footprint, making them suitable for installation in tight spaces or areas with limited access.

The advanced control system in these units takes user experience to the next level. With intuitive controls and a digital display, users can easily set temperatures and monitor system performance. The integrated diagnostics feature ensures quick troubleshooting, enhancing reliability and reducing maintenance time.

Safety is another paramount consideration in the design of the CW series. Both models come equipped with multiple safety features, including a flame safeguard system and a high-temperature limit switch. These safety mechanisms provide peace of mind while ensuring compliance with local building codes.

Furthermore, the CW 645 and CW 745 models are versatile in their applicability. They can be used for a variety of applications including restaurants, schools, and hospitals. Their ability to provide consistent hot water makes them particularly valuable in high-demand situations.

In summary, the Lochinvar CW 645 and CW 745 are exceptional water heating solutions that epitomize efficiency, safety, and performance. With advanced features, user-friendly controls, and solid construction, these units are well-suited to meet the hot water needs of both commercial and residential users. Investing in a CW series water heater not only secures a reliable source of hot water but also contributes to long-term energy savings and environmental sustainability.
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