Due to pump capacity the following specifications cannot be exceeded when using the standard pump:

•Not more than 45 feet of straight pipe.

•For every elbow and tee in excess of those shown above, DEDUCT 5 FEET from maximum allowable straight pipe in heater-to-tank circulating loop.

WATER TREATMENT

(TABLE G) – REQUIRED PUMP

PERFORMANCE FOR WATER HARDNESS

OF 5 TO 25 GRAINS

MODEL

GPM

FT. HD

AMP DRAW

HORSE

VOLTAGE/

 

 

 

 

POWER

PHASE

 

 

 

 

 

 

CW 495-745

60

10

5.8

1/4

120/1

 

 

 

 

 

 

CW 986-2066

90

15

7.4

1/2

120/1

In hard water areas, water treatment should be used to reduce introduction of minerals into the system. Minerals in the water can collect in the heat exchanger tubes causing noise and inefficient operation. Excessive build-up of materials in the heat exchanger can cause a non-warrantable failure.

Acceptable Water Quality Levels Maximum Water Hardness = 25 Grains Minimum Water Hardness = 5 Grains Maximum Total Dissolved Solids = 350 PPM Range of Acceptable pH = 7.2 to 7.8

Standard production Lochinvar water heaters are designed to operate free of impurity build-up in the heat exchanger when properly installed and operated under the specified water quality conditions.

For installation in areas outside these parameters, please consult the factory.

Water Flow Switch

Due to the low water content (between 1 and 6 gallons) of the copper finned tube heat exchanger, a flow switch is factory installed as a low water cutoff device on models CW495 thru CW2066.

The flow switch is installed in the outlet piping from the water heater and wired in series with the ignition system safety controls.

In most localities, a flow switch is acceptable as a low water cutoff device on water heaters requiring forced circulation. It is prudent to verify acceptance with the local code official.

If the local water quality levels are slightly higher than recommended, it may be possible to use a copper-nickel heat exchanger. With copper-nickel being a harder alloy, flow rates can be safely increased to keep the greater water hardness and TDS in suspension. The flow rate can be increased up to 25% faster than the flow rates listed above.

NOTE:

A larger pump must be utilized in situations when the distance between the water and tank exceed those specified.

NOTE:

Care should be taken to measure temperature rise and maintain proper water velocity in the heat exchanger.

NOTE:

If a pressure reducing valve or check valve is in the system a properly sized expansion tank may be required.

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

1 3

 

 

 

 

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Lochinvar CW 645, CW 745 manual Water Treatment, Water Flow Switch
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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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