Ignition

Installation and

Service Manual

are energized. This does not interfere with the safety functionality of either pressure switch or the ignition modules.

(Ignition Module Function)

Once the trial for ignition period has been completed, the ignition module sends 24VAC to the gas valves on one or the other of the primary stages . Gas valves should open and allow gas to flow to the burners in the stages being energized. The fuel/air mixture should ignite from the hot surface igniter. Once this voltage has been sent to the valves, the hot surface igniter is turned off. The ignition module then monitors the status of the flame and will either allow ignition to continue or shut down the gas valves should flame not be proven and proceed to a Flame Failure condition. If flame was proven briefly during the ignition period, the module may not proceed to Flame Failure, but rather post- purge and then go into another trial for ignition.

HEAT TRANSFER PROCESS

(Gas Valves, Burner and Heat Exchanger)

Once flame has been proven, the ignition module will hold the gas valves open as long as there is proof of flame and a call for heat is present. Depending upon the number of stages being called upon by the electronic thermostat controller, more or less B.T.U.’s are delivered to the water within the heat exchanger. Once the temperature rise is sufficient to allow stages to be turned off, the electronic thermostat will begin to shut down stages in preprogrammed order to prevent the set point from being exceeded. When the temperature of the water reaches that of the highest programmed set point, all stages will be shut down.

POST-PURGE

(Ignition Module Function) When 24VAC is removed from the ignition module’s thermostat input, the module turns off the gas valves and maintains the blowers for approximately 25 seconds in order to allow the combustion chamber to be purged of all combustion by-products.

IDLE

(Electronic Thermostat Function)

After completion of the post-purge cycle, the unit will go into an idle state whereby the electronic thermostat continuously monitors the water temperature until the water temperature drops to levels that require additional heat.

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.