Installation & Service Manual

7 Domestic water heaters (continued)

Required temperature rise

Circulating pump

Based on heating potable water with a hardness of 5 to 25 grains per gallon and/or total dissolved solids not exceeding 350 ppm, see Water Chemistry, this page.

1.The water heater must be connected to a properly sized pump that circulates water between the heater and storage tank.

Water chemistry

The required temperature rise and the standard pump sizing are based on the heating of potable water with a hardness of 5 to 25 grains per gallon and a total dissolved solids not exceeding 350 ppm. Consult the appliance manufacturer when heating potable water exceeding these specifications.

Heating of high hardness and/or high total dissolved solids water will require a larger circulating pump, an optional cupro-nickel heat exchanger and a revised temperature rise specification based on the water chemistry of the water to be heated.

Water with a hardness of less than 5 grains per gallon will usually have a low pH which can be aggressive and corrosive causing non-warrantable damage to the heater, pump and associated piping. Corrosion due to water chemistry generally shows up first in the hot water system because heated water increases the rate of corrosive chemical reactions.

Pipe size requirements

Table 7B, pipe sizing chart provides the minimum pipe size for common manifold piping to ensure adequate flow.

TABLE 7C

Pipe Sizing Chart

497 - 747

987 - 2067

 

 

 

 

Number of

Common Pipe

Number of

Common Pipe

Units

Size (Min.)

Units

Size (Min.)

 

 

 

 

1

2''

1

2 1/2''

2

3''

2

4''

3

3''

3

4''

4

4''

4

5''

5

5''

5

6''

6

5''

6

6''

2.The pump is sized to heater input and water hardness. Care should be taken to size the pump correctly. See Water Chemistry, this page.

3.The water heater is equipped with a factory-supplied pump delay system in accordance with the requirements of the latest edition of ASHRAE 90.1.

4.Lubricate the pump to the manufacturer’s recommendations. Pump damage due to inadequate lubrication is non-warrantable.

5.Standard water heaters are furnished with the following circulating pump. Mount the pump on the unit’s inlet water connection.

Models 497 - 747

1/4 HP, 120 VAC, 5.8 Amps

Models 987 - 2067

1/2 HP, 120 VAC, 7.4 Amps

This pump is sized based on installation of a single storage tank and heater in close proximity. If the number of fittings and straight pipe exceeds the quantities shown in this section, a larger pump will be required.

The standard pump selection is based on the following pipe and fittings from the unit to the storage tank:

•

6

90° elbows

•

2

ball valves

•

2

unions

•

1

cold water tee

•No more than 45 feet of straight pipe.

NOTICE

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.

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Lochinvar 497 - 2067 Required temperature rise, Pipe size requirements, Water chemistry, Pipe Sizing Chart 497 987
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497 - 2067 specifications

Lochinvar 497 - 2067 is a highly efficient and versatile condensing boiler that is designed to meet the diverse heating needs of residential and commercial applications. Known for its impressive performance and advanced technology, the Lochinvar 497 - 2067 has garnered a reputation as a reliable choice among heating professionals.

One of the standout features of the Lochinvar 497 - 2067 is its impressive thermal efficiency. The boiler boasts an efficiency rating of up to 95% AFUE (Annual Fuel Utilization Efficiency), allowing users to significantly reduce their energy costs while minimizing environmental impact. This efficiency is facilitated by its innovative condensing technology, which captures and reuses heat from exhaust gases for optimal performance.

The Lochinvar 497 - 2067 is equipped with a robust stainless steel heat exchanger designed to handle high temperatures and ensure long-lasting performance. The heat exchanger’s design maximizes heat transfer, while its corrosion-resistant properties guarantee durability over time. This contributes to the boiler's overall longevity and serviceability, reducing the need for frequent replacements.

Control is another critical feature of the Lochinvar 497 - 2067. The boiler comes with an advanced control system that enables easy management of system operations. Users can take advantage of features such as outdoor reset control, which adjusts the temperature of the boiler based on external weather conditions, enhancing system efficiency and comfort.

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Another important characteristic is the compact design of the Lochinvar 497 - 2067, which allows for flexible installation in various settings, including tight spaces. Its lightweight structure further simplifies the installation process, making it a practical choice for contractors.

In summary, the Lochinvar 497 - 2067 is an exceptional high-efficiency condensing boiler that combines advanced technology, durability, and ease of use. With its impressive thermal efficiency, superior heat exchanger design, advanced control systems, and enhanced safety measures, it stands out as a top choice for those seeking reliable heating solutions. This boiler not only meets but exceeds modern demands for energy efficiency and performance, solidifying its position in the market.
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