6 Hydronic piping

Flow switch adjustment

Refer to Table 6A for the proper setting of the sensitivity screw. For reference, the position of the screw prior to setting should be turned clockwise with a Phillips driver until it stops (FIG. 6-3). Proceed to turn the screw counterclockwise the amount of turns listed in Table 6A based on the model.

Consult the manufacturer’s instructions for wiring the flow switch to your system.

Table 6A Paddle Size / Sensitivity Screw Adjustment

MODEL

PADDLE SIZE

SENSITIVITY SCREW

ADJUSTMENT

 

 

 

 

Note: Paddles are included with the flow switch.

400

#3

 

7½ turns

501

#3

 

5½ turns

601

#3

 

7¼ turns

701

#3

 

5¼ turns

801

#3

 

3¼ turns

 

 

Turn the

sensitivity screw clockwise to

NOTICE

 

 

increase the flow rate required to activate

 

 

the switch. Turn the sensitivity screw

 

 

counterclockwise to decrease the flow rate

 

 

required to activate the switch.

Figure 6-3Flow Switch Adjustment

NORMALLY

OPEN

SENSITIVITY

ADJUSTMENT

GROUND

COMMON NORMALLY

CLOSED

38

Installation & Operation Manual

Near boiler piping components

1.Boiler system piping:

Boiler system piping MUST be sized per the pipe requirements listed in Table 6B. Reducing the pipe size can restrict the flow rate through the boiler, causing inadvertent high limit shutdowns and poor system performance. Flow rates are based on 20 feet (6 m) of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

2.Boiler system circulating pump:

Field supplied. The boiler circulating pump should be based on 20 feet (6 m) of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

3.Domestic hot water circulating pump:

Field supplied. The pump MUST be sized to meet the specified minimum flow requirements listed in FIG.’s 6-5 and 6-6. Consult the indirect water heater operating guide to determine flow characteristics for the selected product used.

4.Variable speed boiler system circulator:

Knight boilers are capable of controlling a variable speed boiler system circulator. Variable speed circulators MUST be sized to meet the specified minimum flow requirements listed in FIG.’s 6-5 and 6-6 on page 40 at full speed.

5.Boiler isolation valves:

Field supplied. Full port ball valves are required. Failure to use full port ball valves could result in a restricted flow rate through the boiler.

6.Check valves:

Field supplied. Check valves are recommended for installation as shown in FIG.’s 6-7 through 6-11. Failure to install check valves could result in a reverse flow condition during pump(s) off cycle.

7.Domestic indirect hot water isolation valves:

Field supplied. Full port ball valves are required. Failure to use full port ball valves could result in a restricted flow rate through the boiler.

8.Anti-scald mixing valve:

Field supplied. An anti-scald mixing valve is recommended when storing domestic hot water above 115°F (46°C).

9.Unions:

Field supplied. Recommended for unit serviceability.

10.Temperature and pressure gauge:

Factory supplied. The temperature and pressure gauge is shipped loose. It is the responsibility of the contractor to install the temperature and pressure gauge on the boiler water outlet.

11.Pressure relief valve:

Factory supplied. The pressure relief valve is sized to ASME specifications.

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Page 38
Image 38
Lochinvar 801, 400 operation manual Flow switch adjustment, Near boiler piping components
Page 37 Page 39

400, 801 specifications

The Lochinvar 801,400 is a cutting-edge solution in the realm of high-efficiency commercial water heating. This model represents a significant advancement in the design and functionality of water heaters, catering primarily to the demands of large-scale facilities like hotels, hospitals, and large industrial operations.

One of the standout features of the Lochinvar 801,400 is its impressive heating capacity, which can produce up to 801,400 BTUs, making it suitable for high-demand applications. This output is crucial for establishments that require a consistent supply of hot water, such as commercial kitchens and laundry facilities. The robust design ensures that it can handle peak demand periods without compromising performance.

Another significant aspect is the innovative use of advanced technology in its operation. The Lochinvar 801,400 integrates smart controls that enhance its efficiency and ease of operation. These controls allow for precise monitoring and adjustment of water temperatures, ensuring that the system operates within optimal parameters while maximizing energy savings. The intelligent monitoring system can provide real-time updates, making it easier for facility managers to keep track of performance and address maintenance needs proactively.

The construction of the Lochinvar 801,400 incorporates durable materials that not only enhance the longevity of the unit but also offer resistance to corrosion and wear. This durability translates into lower maintenance costs and an extended lifespan for the unit, making it a worthwhile investment for businesses.

Moreover, the Lochinvar 801,400 is designed with energy efficiency in mind. It boasts a high thermal efficiency rating, which reduces operational costs and minimizes the carbon footprint of heating operations. This efficiency is critical in today’s environmentally conscious market, where businesses are seeking to reduce their energy consumption and comply with strict regulations.

The design of the Lochinvar 801,400 also prioritizes safety, featuring innovative safety controls and fail-safes that protect both the unit and the users.

In summary, the Lochinvar 801,400 offers a combination of high capacity, advanced technology, durability, and energy efficiency, making it an excellent choice for commercial water heating solutions. As industries continue to evolve, the demand for reliable and efficient water heating solutions like the Lochinvar 801,400 will only increase.
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