Service Manual

1 Service

Outdoor Air Shutdown Differential (SH1 - SH3)

Boost Time

The outdoor air shutdown differential parameter is the number of degrees below Outdoor Air Shutdown SH1, SH2, and SH3 parameters the outdoor air temperature must go before the boiler will respond to a SH demand. These parameters can be changed by the installer by accessing the Outdoor Air Shutdown Differential SH1, SH2, and SH3 parameters The temperature range of this parameter is 0°F (0°C) to 54°F (30°C). The default value is 10°F (6°C).

Shift Reset Curve (SH1 - SH3)

There is a shift reset curve for each outdoor reset. The shift reset curve parameter shifts the actual set point above or below the calculated set point by the number of degrees in this parameter. These parameters can be changed by the installer by accessing the Shift Reset Curve SH1, SH2, and SH3 parameters. The temperature range of this parameter is -17°F (-10°C) to 18°F (10°C). The default value is 0°F (0°C). This feature will be active if this parameter is set to anything other than 0°F (0°C).

The boost time parameter sets the amount of time that must elapse with a SH demand before the water temperature calculated set point will be increased. This parameter can be changed by the installer by accessing the Boost Time parameter. The time range for this parameter is 0 minute to 50 minutes. The default value is 0 minutes.

Anti-Cycling

Anti-Cycling Time

Once a SH demand has been satisfied, a set amount of time must elapse before the control will respond to a new SH demand. The control will block the new heat demand and anti-cycling will be shown in the display until the time has elapsed or the water temperature drops below the Anti-Cycling Override Differential parameter. This parameter can be changed by the installer by accessing the Anti-Cycling Time parameter. The time range for this parameter is 1 minute to 10 minutes. The default value is 1 minute.

Boost Temperature

Anti-Cycling Override Differential

If a SH demand lasts longer than the programmed time

The control will bypass the anti-cycling time if the inlet

delay setting and there have been no DHW demands, the

water temperature drops too much. The control will use the

control will increase the water temperature set point by the

inlet water temperature the boiler was at when it shut off as

amount in this parameter. If the SH demand continues

the starting point. If the inlet temperature drops below the

through another time period, the set point will be increased

temperature parameter the control will abort anti-cycling and

again. This will continue until either the SH demand ends,

allow the boiler to fire. This parameter can be changed by

a maximum of 20 increases has occurred, or SH1, SH2,

the installer by accessing the Anti-Cycling Override Differential

SH3 maximum set point has been reached. Once the SH

parameter. The temperature range of this parameter is 0°F (0°C)

demand has been satisfied the set point will revert back

to 54°F (30°C). The default value is 10°F (6°C).

to its calculated setting. The boost temperature can be

Ramp Delay (Enable / Disable)

changed by the installer by accessing the Boost Temperature

 

parameter. The temperature range of this parameter is 0°F

This parameter allows the installer to enable or disable the SH

(0°C) to 25°F (14°C). The default value is 0°F (0°C). This

ramp delay. The default setting is disabled.

feature will be active if this parameter is set to anything

 

other than 0°F (0°C).

 

 

 

Figure 1-2Ramp Delay Interval

 

22

Page 21 Page 23
Page 22
Image 22
Lochinvar 400-801 service manual Anti-Cycling
Page 21 Page 23

400-801 specifications

The Lochinvar 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

One of the standout features of the Lochinvar 400-801 is its high thermal efficiency, which can reach up to 99%. This efficiency not only reduces fuel consumption but also lowers operating costs, making it an economical choice for businesses seeking to minimize overhead. The boiler employs a stainless steel fire-tube heat exchanger that ensures optimal heat transfer and durability. This construction allows for enhanced resistance to corrosion, thereby extending the boiler's lifespan.

The Lochinvar 400-801 is equipped with advanced control technologies that enhance its performance. With its built-in SMART SYSTEM control, users can easily monitor and manage the boiler’s operations, optimizing performance while ensuring ease of use. This control system features a user-friendly interface that provides real-time data, including temperature settings, pressure readings, and operational status, allowing for quick diagnostics and efficient troubleshooting.

Safety is paramount in the design of the Lochinvar 400-801. The boiler includes a comprehensive safety system that incorporates multiple safety interlocks and a venting system that prevents backflow and ensures safe exhaust. Moreover, the unit is designed to operate with minimal noise, making it suitable for environments where noise reduction is crucial.

Installation and maintenance of the Lochinvar 400-801 are straightforward, thanks to its compact design and multiple venting options. The low-profile construction allows for flexibility in placement, making it an ideal fit for tight spaces. Maintenance tasks are simplified with accessible components, minimizing downtime and ensuring the system operates efficiently over its lifespan.

In conclusion, the Lochinvar 400-801 stands out in the commercial boiler market with its blend of efficiency, reliability, and innovation. With its advanced technologies and features, businesses can achieve significant energy savings while ensuring comfortable and consistent heat for various applications. The Lochinvar 400-801 is an investment in quality and performance, backed by a well-established brand in the heating industry. Whether for a new installation or a replacement, this boiler offers a comprehensive solution for commercial heating needs.
Top Page Image Contents