1Service

SH Differential

The SH differential sets how many degrees below the turn off temperature the temperature has to go before the boiler will turn on. This parameter can only be changed by the installer by accessing parameter B5. The temperature range of this parameter is 0°F (0°C) to 54°F (30°C). The default value is 20°F (11°C).

C: Data logging

Hours running SH

The hours running SH parameter shows the total number of hours the boiler has been in the SH firing position. This parameter can be viewed by the user and the installer by accessing parameter C1.

Hours running DHW

The hours running DHW parameter shows the total number of hours the boiler has been in the DHW firing position. This parameter can be viewed by the user and the installer by accessing parameter C2.

Ignition attempts

The ignition attempts parameter shows the total number of times the boiler has attempted to fire. This parameter can be viewed by the user and the installer by accessing parameter C3.

Show last 10 errors

The control will log the 10 most current errors with the date and time the error occurred. This parameter can be viewed by the user and the installer by accessing parameter C4.

D: Functions

Reset last 10 errors

The reset last 10 errors parameter allows the error counter to be reset to 0. This parameter can only be cleared by the installer by accessing parameter D1. Once accessed, press the RESET key to clear the counter.

Service mode delay

By pressing the pin button on the front of the display for five (5) seconds, the control will be placed in Service Mode. This will override all other heat demands. The Service Mode allows the installer to set the unit to either maximum firing rate or minimum firing rate for the purpose of combustion analysis. The delay sets the length of time the boiler will stay in the Service Mode if no keys have been pressed before going back to its original state. This parameter can only be changed by the installer by accessing parameter D2. The time range of this parameter is 0 to 40 minutes. The default value is 20 minutes.

Service Manual

E: DHW settings

DHW boiler set point

When a DHW call for heat becomes active, the control will use the DHW boiler set point to determine the firing rate of the boiler based on the actual water temperature. This parameter can be changed by the installer by accessing parameter E1. The temperature range of this parameter is 50°F (10°C) to 190°F (88°C). The default value is 180°F (82°C).

SH/DHW switching time

The SH/DHW switching time parameter sets the length of time the control will stay in DHW Mode when a SH call has been received. After this time period has expired the control will revert to SH Mode. If a DHW call is still active the timer will reset. After the time period has expired the control will revert back to DHW Mode. This will continue until one of the demands has been satisfied. This parameter can be changed by the installer by accessing parameter E2. The time range of this parameter is 10 minutes to 240 minutes. The default value is 30 minutes.

DHW tank set point

By installing a tank sensor, the SMART SYSTEM control can perform the tank thermostat function. The SMART SYSTEM control automatically detects the presence of this sensor, and generates a DHW call for heat when the tank temperature drops 6°F (3.5°C) below the tank set point, and finishes the call for heat when the tank temperature goes 4°F (2°C) above the tank set point. This parameter can be changed by the installer by accessing parameter E3. The temperature range of this parameter is 32°F (0°C) to 212°F (100°C). The default value is 125°F (52°C).

F: Outdoor air reset

Outdoor air reset operation

If an outdoor air sensor is installed, the control will calculate the water temperature set point based on the outdoor air temperature. As the outdoor air temperature drops the water temperature set point increases. This feature allows the boiler to be more efficient in periods of mild weather, see FIG. 1-1 on page 19.

Minimum air temperature

When the outdoor air temperature drops below this point, the water temperature will be at its maximum setting (FIG. 1-1). However, if the user set point is set lower, the water temperature will be limited by the user set point instead. This parameter can be changed by the installer by accessing parameter F1. The temperature range of this parameter is -30°F (-34°C) to 90°F (32°C). The default value is 25°F (-4°C).

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Lochinvar 399 - 800 service manual Data logging, Functions, DHW settings, Outdoor air reset

399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.