Connecting to Water Supply

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION Continued

4.Locate the reference hose on the second gas valve which goes from the vent fitting on the gas valve to a barbed fitting on the deck of the unit (see FIG. 31).

5.Remove the flexible cap from the barbed fitting on the “tee” located in this line and hook one side of the manometer, or (-) side of a magnehelic gauge, to this “tee”.

Retain this cap for future use.

6.Remove the 1/8" hex plug from the manifold pressure tap on the gas valve (see FIG. 31). Retain plug for future use.

7.Install a fitting in this tap that is suitable for connection of a hose to a manometer, or (+) side of a magnehelic gauge (see FIG. 31).

8.Turn the power switch to the “I” or “ON” position.

9.Push the reset button(s) for the ignition control(s), if necessary.

10.Set the electronic temperature control to call for heat (see Programming Temperature Control).

11.Once the unit is firing the manometer/magnehelic will reflect the Manifold Gas Pressure. Compare this reading to the respective value in TABLE-M for Natural Gas or Propane Gas.

12.If adjustment is necessary, remove the regulator cover screw on the gas valve. NOTE: If the gas valve under adjustment is located on a manifold assembly monitored by an igniter, the unit may shut down and recycle when the regulator cover screw is removed. This is normal.

13.Turn the regulator adjustment screw “clockwise” to raise the regulator gas pressure. Turn the regulator adjustment screw “counterclockwise” to lower the regulator gas pressure.

14.Replace the regulator cover screw and make sure it is tight for proper operation.

15.Read the value on the manometer/magnehelic and compare it to the values in TABLE-M.

16.Repeat this adjustment procedure for each gas valve as necessary to adjust to the proper manifold gas pressure.

17.Remove hoses, replace and tighten plugs and caps when complete.

18.Replace top front upper jacket access panels and control panel door in reverse order.

FIG. 31 Measuring Manifold Gas Pressure

19.If proper ignition and burner operation is not achieved after checking gas supply pressure, see Cleaning and Maintenance, page 57 for Combustion Air Fan Adjustment. Follow the procedure to adjust the combustion air fans as necessary.

	TABLE-M	ressure
Net Manifold Pressure		ressure
Net Manifold Pressure

399,999 - 750,000
Nat. Gas	1.8" w.c.
LP Gas	4.6" w.c.

990,000 - 2,070,000
Nat. Gas	1.2" w.c.
LP Gas	4.6" w.c.

Inlet and Outlet Connections

For ease of service, install unions on the water inlet and water outlet of the unit. The connection to the unit marked “Inlet” on the header should be used for return from the system. The connection on the header marked “Outlet” is to be connected to the supply side of the system.

399, CF-CH(E)-i&s-08, 999 - 750 specifications

Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 is a cutting-edge boiler designed for commercial heating applications. With its robust construction and high efficiency, this model stands out in the crowded market of heating solutions.

One of the main features of the Lochinvar 999 - 750 is its exceptional thermal efficiency rating. The unit incorporates advanced condensing technology that allows it to recover heat from flue gases, which helps in achieving efficiency levels of up to 99%. This efficiency not only reduces energy consumption but also lowers operational costs, making it an excellent investment for businesses looking to minimize their carbon footprint.

The boiler is designed to provide a powerful output of 750 kW, ensuring it meets the heating demands of larger buildings or commercial spaces. Its capacity makes it suitable for a range of applications including schools, hospitals, and industrial facilities. Moreover, the unit features a built-in cascading system that enables multiple boilers to be connected, enhancing system reliability and flexibility.

In terms of technology, the Lochinvar 999 - 750 is equipped with a user-friendly touchscreen interface. This innovative control system allows operators to monitor and adjust settings with ease, providing real-time performance data and alerts for maintenance needs. The intelligent controls optimize operation to match the heating load, further enhancing energy efficiency.

Safety is a top priority with this model. It is built with multiple safety features such as automatic shut-off valves, pressure relief valves, and flame monitoring systems, ensuring safe operation under various conditions. The unit also adheres to stringent industry standards and regulations, making it a reliable choice for commercial applications.

Furthermore, the Lochinvar 999 - 750 is designed with serviceability in mind. Its compact footprint and accessible components simplify maintenance, reducing downtime and associated costs. The unit also supports a variety of fuel sources, including natural gas, propane, and biodiesel, providing flexibility to meet different facility requirements.

In summary, the Lochinvar 999 - 750, CF-CH(E)-i&s-08,399 represents a blend of efficiency, reliability, and safety in commercial heating. Its advanced technologies and thoughtful design make it a powerful solution for various heating needs, making it an ideal choice for businesses aiming for excellence in energy management and operational efficiency.