Manuals / Lochinvar / Household Appliance / Water Heater

Lochinvar CW 745, CW 645 LOW Water Temperature Delivery, Water Velocity Control, Pump Operation

Models: CW 645 CW 745

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Lochinvar

LOW WATER

TEMPERATURE DELIVERY

A number of water heating applications may require delivered water temperature in a system below 140°F. Systems such as nursing homes and hospitals would be examples of this type of system.

A water heating system that will be operated at less than 140°F must use a mixing valve on the outlet side of the storage tank in order to ensure that the products of combustion do not condense inside the combustion chamber of the water heater.

The mixing valve allows the water heater to operate above 140°F to protect from condensation, while still allowing a delivery of colder water to the system fixtures. Also inherent in this design is the protection of occupants from water containing bacteria such as Legionella. Legionella can be significantly reduced in the water storage vessel by heating the water to a minimum of 140°F. (See Appendix A for piping details.)

WATER VELOCITY CONTROL

IMPORTANT

To ensure proper velocity through the heat exchanger, it is necessary to regulate the temperature rise across the heat exchanger from inlet to outlet. (This must be done on initial installation and periodically rechecked).

With the correct temperature rise across the heat exchanger (See TABLE F), you may be

assured of the proper velocity in the tubes and long life and economical operation from the water heater.

(TABLE F) - REQUIRED TEMPERATURE RISE

MODEL NUMBER

TEMPERATURE RISE °F

 

 

CW 495

15

CW 645

19

 

 

CW 745

22

CW 986

19

 

 

CW 1256

24

CW 1436

27

 

 

CW 1796

34

CW 2066

39

PUMP OPERATION

1.The water heater MUST be connected with a properly sized and installed, intermittent operating, all bronze pump that circulates water between heater and storage tank.

2.The pump is sized to heater input and water hardness. Should water hardness exceed 25 grains/350 TDS, consult factory for pump sizing.

The pump chart (TABLE H) is based on the following fittings:

6-90° elbows

2 ball valves

2 unions

1 cold water supply tee

 

 

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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 LOW Water Temperature Delivery, Water Velocity Control, Pump Operation, Ball valves
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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.