Service Manual

 

 

 

1 Service (continued)

 

 

Outdoor Reset

Set Point (1 - 3) at Low Outdoor Temperature

The option of controlling up to three (3) different outdoor

When the outdoor air temperature drops to the Outdoor

(1 - 3) Low parameters, the calculated set point will be at

resets for low outdoor temperatures is available.

this setting (FIG. 1-1). If the outdoor air temperature drops

 

Outdoor (1 - 3) Low

further, the set point will continue to increase above this

setting. However, if SH1, SH2, and SH3 are set lower, the

When the outdoor air temperature drops to this point, the

water temperature will be limited by these set points instead.

These parameters can be changed by the installer by accessing

water temperature will be at the Set point 1 at Low Outdoor

the Set point 1 at Low Outdoor Temp 1, Set point 2 at Low

Temp 1, Set point 2 at Low Outdoor Temp 2 and Set point

Outdoor Temp 2 and Set point 3 at Low Outdoor Temp 3

3 at Low Outdoor Temp 3 parameters (FIG. 1-1). If the

parameters. The temperature range of this parameter is 68°F

outdoor air temperature drops further, the set point will

(20°C) to 180°F (82°C). The default value is 180°C (82°C).

continue to increase above this setting. This parameter can

Set Point (1 - 3) at High Outdoor Temperature

be changed by the installer by accessing the Outdoor (1-3)

Low parameter. The temperature range of this parameter is

When the outdoor air temperature rises to or above Outdoor

-39°F (-39°C) to high outdoor temperature set point. The

(1 - 3) High parameters, the calculated set point will be at this

default value is 25°F (-4°C).

setting (FIG. 1-1). These parameters can be changed by the

 

Outdoor (1 - 3) High

installer by accessing the Set point 1 at High Outdoor Temp 1,

Set point 2 at High Outdoor Temp 2 and Set point 3 at High

When the outdoor air temperature rises to or above this

Outdoor Temp 3 parameters. The temperature range of this

parameter is 68°F (20°C) to 190°F (88°C). The default value

point, the water temperature will be at the Set point 1 at High

is 70°F (21°C).

Outdoor Temp 1, Set point 2 at High Outdoor Temp 2 and

Outdoor Air Shutdown (SH1 - SH3)

Set point 3 at High Outdoor Temp 3 parameters (FIG. 1-1).

This parameter can be changed by the installer by accessing

When the outdoor temperature rises above this point, the

the Outdoor (1-3) High parameter. The temperature range

control will block all SH demands (DHW demands will still

of this parameter is low outdoor temperature set point to

be active). These parameters can be changed by the installer

104°F (40°C). The default value is 70°F (21°C).

by accessing the Outdoor Air Shutdown SH1, SH2, and SH3

 

 

parameters. The temperature range of this parameter is 32°F

 

(0°C) to 104°F (40°C). The default value is 70°F (21°C).

 

 

 

Figure 1-1Outdoor Air Reset Curve

 

 

SET POINT AT

 

LOW OUTDOOR

 

TEMPERATURE

 

(SH)

 

SET POINT

 

SET POINT AT

 

HIGH OUTDOOR

 

TEMPERATURE

 

 

HIGH OUTDOOR

 

TEMPERATURE

LOW OUTDOOR

21

TEMPERATURE

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Lochinvar 400-801 service manual Outdoor Reset
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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.
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