Lochinvar

NOTE:

A vent system should never be sized based only on the vent connection diameter of the appliance. For proper vent design and sizing, please consult the National Fuel Gas Code (ANSI Z223.1).

must be consistent with the National Fuel Gas Code Z223.1 or in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment.

VENTING OPTIONS

Conventional Venting

A conventional venting system utilizes the natural buoyancy of the heated flue products to generate a negative draft. This draft forces flue products to rise vertically through a rooftop flue termination. The vent connection is made directly to the top of the unit and combustion air supplied from the mechanical room. Properly sizing vent material and the use of a barometric damper (when required) will lead to proper vent operation.

The minimum flue pipe diameters for Copper-Fin models, utilizing negative draft venting are as follows:

(TABLE B)

FLUE SIZES AND COMBUSTION AIR PIPE SIZES

MODEL

FLUE SIZE

NUMBER

 

 

 

CW 495

6"

CW 645

8"

 

 

CW 745

8"

CW 986

10"

 

 

CW 1256

12"

CW 1436

12"

 

 

CW 1796

14"

CW 2066

14"

Size vent material using the “FAN” category of vent sizing tables in the latest edition of the National Fuel Gas Code. “FAN” applies to fan-assisted combustion appliances in Category I.

Barometric Dampers

A barometric damper is required when draft exceeds 0.08 inches of negative water column. When installed and adjusted properly, a barometric damper will maintain draft between 0.02 and 0.08 inches of negative water column ensuring proper operation.

Multiple unit installations with combined venting also require barometric dampers to regulate draft at each unit. Again, the negative draft must be within the range of

0.02to 0.08 inches of negative water column to ensure proper operation.

(FIG. 7) BAROMETRIC DAMPER INSTALLATION

8

L o c h i n v a r D E S I G N E R S G U I D E C O P P E R - F I N W A T E R H E A T E R 6 1 5 - 8 8 9 - 8 9 0 0

 

 

 

 

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Lochinvar CW 745, CW 645 manual Venting Options, Conventional Venting, Barometric Dampers

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.