Installation & Service Manual

3 Gas connections

Connecting to gas supply

Gas piping

Verify that the appliance is supplied with the type of gas specified on the rating plate. This appliance is configured for operation up to 2000 feet altitude. Consult factory for installations above 2000 feet elevation.

Inlet gas pressure: Measured at the inlet pressure tap on the appliance gas manifold. The pressure tap is located upstream of the combination gas valve(s).

See Table 3A for maximum and minimum inlet pressures. Do not exceed the maximum. Minimum inlet pressure is for the purpose of input adjustment.

TABLE 3A

INLET GAS PRESSURE

 

NATURAL

 

LP

MODEL

 

 

 

 

 

Max.

Min.

Max.

 

Min.

 

w.c.

w.c.

w.c.

 

w.c.

 

 

 

 

 

 

497 - 747

14''

4.0''

14.0''

 

8.0''

 

 

 

 

 

 

987 - 2067

14''

4.5''

14.0''

 

8.0''

 

 

 

 

 

 

Manifold pressure: The gas regulator on the unit’s combination gas valve is adjustable to supply proper manifold pressure for normal operation.

NOTICE

If an inline high gas pressure regulator is

used, it MUST BE of the lockup type and

 

be located a minimum of 10 feet from the

To safely operate this unit, you must properly size the gas supply piping. See Tables 3B through 3D for piping and fitting requirements. Gas pipe size may be larger than heater connection.

The gas connection for Models 497 - 747 is 1 1/4'' NPT and on Models 987 - 2067 the gas connection to these units is 2'' NPT.

For ease of service, install a union.

Install a manual main gas shutoff valve, outside of the unit gas connection within six feet of the unit in accordance with the requirements of the National Fuel Gas Code, ANSI Z223.1.

You must provide a sediment trap (drip leg) in the inlet of the gas connection to the unit.

NOTICE

It is the installer’s responsibility to supply

the sediment trap (drip leg).

The combination gas valves have an integral vent limiting device and do not require venting to atmosphere, outside the building. The unit will not operate properly if the reference hose is removed or a vent to atmosphere is installed.

Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes.

Figure 3-1_Gas line connection

appliance.

Failure to do so may result in

insufficient gas volume supplied to the

appliance.

 

If you must adjust regulator pressure, follow the instructions under Gas Manifold Pressure Adjustment on page 25. Do not increase regulator pressure beyond specified pressure setting.

Gas pressure test

COUPLING

UNION

MANUAL MAIN

SHUT OFF

VALVE

USE WRENCH

TO HOLD

SUPPLY PIPE

8"

MIN

1.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).

2.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).

3.The appliance and its gas connection must be leak tested before placing it in operation.

NIPPLE

CAP

22

Page 22
Image 22
Lochinvar 497 - 2067 service manual Gas connections, Connecting to gas supply Gas piping, Gas pressure test

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.

In terms of safety, the Lochinvar 497 - 2067 incorporates several cutting-edge safety features, including a flame detection system and multiple safety shut-off devices. These safeguards help to ensure the safe operation of the boiler, providing peace of mind to users and heating professionals alike.

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.